TW201616006A - Manufacturing tool of dust cover and manufacturing method of the same - Google Patents

Abstract

The present invention provides a manufacturing tool of a dust cover for reducing operation burden for fixing to an annular component. The solution is that a pillar (32) is inserted into a bag body (10), wherein a head (33) at a top end of the pillar (32) is covered by a bag portion (11). The bag portion (11), in a condition of being in contact with the head (33) is inserted into a spring rubber base (100) (annular component) with an inserted end (4) between a brittle portion (20) and a main cylinder (2) fixed on the annular component and, the brittle portion (20) of the bag portion (11) that is fixed on the annular component is broken to remove the side associated with an axial end. By supporting the bag portion (11) with the pillar (32) and the head (33), the bag portion (11) can be easily inserted into the annular component, and thus, the operation burden for fixing the annular component on the main cylinder (2) can be reduced.

Description

Manufacturing tool of dust cover and method of manufacturing dust cover

The present invention relates to a manufacturing tool for a dust cover and a method for manufacturing the dust cover, and more particularly to a manufacturing tool for a dust cover and a method for manufacturing the dust cover that can reduce the operational load fixed to the annular member.

A dust cover for preventing dust from entering between the piston rod and the guide rod or the like is attached to the damper in the suspension mechanism of the automobile (for example, Patent Document 1). In the technique disclosed in Patent Document 1, the axial end portion of the tubular member is fixed to an annular member (cylindrical metal member) attached to the vehicle body side, and a dust cover is provided to surround the circumference of the piston rod. (tubular parts).

[Prior patent documents] [Patent Literature]

Patent Document 1: Japanese Patent Publication No. Hei 7-239030

However, in the above-described prior art, since the operation of fixing the dust cover on the annular member attached to the vehicle body side is cumbersome, there is a problem that the operation load is large.

The present invention has been made to solve the above problems, and an object thereof is to provide a dust cover capable of reducing an operation load fixed to an annular member. Tool and dust cover manufacturing method.

In order to achieve the object, according to the manufacturing tool of the dust cover of the first aspect of the invention, the dust cover is manufactured such that the tubular body tube portion is disposed so as to surround the outer circumference of the piston rod of the damper of the vehicle, and the main body tube portion is attached to The annular part on the side of the vehicle body is combined. In the main body tubular portion, the bag portion is connected to the axial end portion, and a weak portion that is more likely to be broken than the main body tubular portion is formed in the bag portion in the circumferential direction. A pillar is inserted into a bag-like body that is connected to the axial end of the body portion of the body portion, and the pocket portion covers the head portion provided on the tip end of the pillar. The bag portion is inserted into the annular member in a state of being in contact with the head portion, and the interposed end portion between the fragile portion and the main body tubular portion is fixed to the annular member. The bag portion and the head support bag portion can be easily inserted into the annular member. The fragile portion of the bag portion fixed to the annular member is broken, and the axial end portion side is removed. Thereby, it is possible to have an effect of reducing the operational load of fixing the main tubular portion to the annular member.

According to the manufacturing tool of the second aspect of the invention, the body tubular portion is inserted inside the wall portion provided around the pillar. Since the distal end surface of the wall portion abuts against the axial end surface of the annular member, the positioning of the annular member with respect to the pocket portion can be performed by the distal end surface of the wall portion. Therefore, in addition to the effect of the first aspect of the patent application, there is also an effect of improving the positioning accuracy of the annular member with respect to the pocket portion.

According to the manufacturing tool of the third aspect of the invention, in the wall portion, the axial length from the abutting surface of the head abutting the bag portion to the distal end surface is the same as the bag abutting from the abutting surface. The position of the tip end surface is set such that the inner surface of the portion is the same in the axial length of the projecting portion. In the main body tube portion, the protruding portion is bent from the axial end portion The inner diameter of the member protrudes more radially outward. As a result, in addition to the effect of the second aspect of the patent application, when the bag portion is inserted into the annular member through the distal end surface of the wall portion, there is an effect that the annular member is accurately attached to the position of the extension portion.

According to the manufacturing tool of the fourth aspect of the invention, the head portion is formed with a recess that is visible through the hole portion in a state in which the bag portion is covered. Since the bag portion avoids the portion that intersects the axis of the main body tubular portion and penetrates the hole portion in the thickness direction, the finger or the tool can be easily inserted through the concave portion. Thereby, when the fragile portion is broken, it is possible to easily apply a force to the bag portion using the hole portion. Further, since the hole portion is provided at a portion that intersects the axis, when the fragile portion is broken, the force in the swaying direction is applied to the fragile portion so that the bag portion is opened by the hole portion, and the stress can be easily concentrated. At the beginning of the break. Therefore, in addition to the effects of any one of the first to third aspects of the patent application, there is an effect that the fragile portion can be easily broken.

According to the method of manufacturing the dust cover of the fifth aspect of the invention, the dust cover is manufactured such that the cylindrical body portion is disposed so as to surround the outer circumference of the piston rod of the damper of the vehicle, and the main body tube portion is attached to the vehicle body side. The ring members are combined. The bag-shaped body is formed by a preparation step in which a bag portion which is formed in a fragile portion which is more easily broken than the main body tubular portion in the circumferential direction is connected to the axial end portion, and is provided in the support portion by a covering step The top portion of the head covers the pocket portion of the bag body; the bag portion covering the head portion is inserted into the annular member by an interpolation process; and the interpolation between the fragile portion and the main body tube portion is performed by the removing step In a state in which the end portion is fixed to the annular member, the fragile portion is broken, and the end portion of the annular member is retained and fixed, and the axial end portion side is removed. Thereby, it has the same effect as the first item of the patent application range.

1‧‧‧ dust cover

2‧‧‧ Body tube

3‧‧‧Open end

4‧‧‧Interpolated end

5‧‧‧Outreach

10‧‧‧Bag

11‧‧‧ Bag Department

12‧‧‧ base

13‧‧‧Top part

14‧‧‧Slots

15‧‧‧Contacting the face

16‧‧‧The outer part

17‧‧‧ recess

18‧‧‧ Hole Department

20‧‧‧ Fragile Department

21‧‧‧ slitting

22‧‧‧Connecting Department

30‧‧‧Manufacturing tools

31‧‧‧Department

32‧‧‧ pillar

33‧‧‧ head

34‧‧‧Abutment

34a‧‧‧Cylindrical side

35‧‧‧ recess

36‧‧‧ Notch

37‧‧‧ inserted through hole

38‧‧‧ bolt

39‧‧‧ wall

40‧‧‧ top surface

41‧‧‧Handle

100‧‧‧Spring rubber seat (ring part)

101‧‧‧ Main body

102‧‧‧Flange

103‧‧‧Protruding

110‧‧‧ Shock absorbers

111‧‧‧Cylinder block

112‧‧‧ piston rod

113‧‧‧ coil spring

201‧‧‧Molding die

202‧‧‧Forming mould

203‧‧‧ cavity

204‧‧‧ nozzle

205‧‧‧Blank

210‧‧‧Molded body

A‧‧‧ cut line

B‧‧‧ cut line

D‧‧‧

G1‧‧‧ gap

G2‧‧‧ gap

O‧‧‧ axis

R‧‧‧ arrow

T‧‧‧ thickness

1 is an axial cross-sectional view of a suspension mechanism to which a dust cover according to an embodiment of the present invention is attached.

2 is a perspective view of a bag body.

Fig. 3 is a schematic view for explaining a method of producing a bag body, wherein (a) is a schematic view showing an extrusion step of the parison, (b) is a schematic view showing a gas injecting step, and (c) is a mold releasing step. And a schematic diagram of the final processing procedure.

Figure 4 is a cross-sectional view of the fragile portion.

Fig. 5 is a plan view showing a manufacturing tool of the dust cover.

Figure 6 is a cross-sectional view of the manufacturing tool at line VI-VI of Figure 5.

Fig. 7 is a side view of the bag body interposed in the annular member.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, a schematic configuration of a dust cover 1 according to a first embodiment of the present invention will be described with reference to Fig. 1 . Fig. 1 is an axial sectional view showing a suspension mechanism to which the dust cover 1 of the first embodiment is attached. The suspension mechanism is a member that connects the upper end of the damper 110 whose lower end is connected to the wheel (not shown) side to the side of the vehicle body frame (not shown) by a fixing device (not shown), thereby being used for The wheel can be suspended from the body frame by rocking up and down. In FIG. 1, for the sake of easy understanding, the illustration of the vehicle body (vehicle frame) and the fixing device is omitted, and a part of the damper 110 and the coil spring 113 in the axial direction (up and down direction of FIG. 1) is omitted.

As shown in Fig. 1, in the suspension mechanism, the lower end portion (not shown) of the coil spring 113 is fixed to the cylinder 111 of the damper 110, on the coil spring 113. A spring rubber seat 100 (annular member) is provided between the end portion and a support seat of a fixing device (not shown). The vibration transmitted from the wheel side to the vehicle body frame side via the damper 110 is reduced by the fixing device, and the vibration transmitted from the wheel side to the vehicle body frame side by the coil spring 113 is reduced by the spring rubber seat 100.

The spring rubber seat 100 includes a main body portion 101 that is formed in an annular shape as viewed in the axial direction (vertical direction in FIG. 1), and a flange portion 102 that is formed to protrude radially outward from the main body portion 101. A rubber-like elastic body having a suitable spring constant is integrally formed. In the present embodiment, the spring rubber seat 100 includes a protruding portion 103 that protrudes in an annular shape from the inner peripheral edge of the one end side (the lower side in FIG. 1) of the main body portion 101 in the axial direction.

The dust cover 1 is a thin-walled tubular member for preventing dust from entering the damper 110, and includes a main body tubular portion 2, an open end portion 3, and an interposing end portion 4, and the main body tubular portion 2 is disposed to surround the damper 110. The outer circumference of the piston rod 112; the opening end portion 3 is disposed at an outer peripheral portion of the cylinder block 111; the insertion end portion 4 is disposed at a distal end side of the piston rod 112, and the spring rubber seat is simultaneously inserted into the main body of the spring rubber seat 100 Part 101; these components are integrally formed.

The main body tubular portion 2 is formed in a bellows shape in order to ensure elasticity in the axial direction, and a flange-like projecting portion 5 that protrudes outward in the radial direction is formed at an end portion in the axial direction. The projecting portion 5 is a portion for dividing the main body tubular portion 2 and the insertion end portion 4 in the axial direction, and has an outer diameter that can abut against the axial end surface (the lower side surface of FIG. 1) of the main body portion 101 of the spring rubber seat 100. . The insertion length of the insertion end portion 4 to the main body portion 101 of the spring rubber seat 100 is determined by the extension portion 5.

In the present embodiment, the dust cover 1 is integrally molded from a thermoplastic resin. As a thermoplastic resin, it can be a polyolefin tree such as polypropylene or polyethylene. Various thermoplastic high-elastic materials such as fat, polyamine resin, polyvinyl chloride resin, polyester resin, urethane resin, styrene resin, and polyolefin resin such as polypropylene are mixed with ethylene propylene rubber and The material to be decentralized is appropriately selected. Further, the dust cover 1 may be formed of a rubber elastic body.

Next, the bag-like body 10 used when the insertion end portion 4 of the dust cover 1 is inserted into the main body portion 101 of the spring rubber seat 100 will be described with reference to Fig. 2 . FIG. 2 is a perspective view of the bag body 10.

As shown in Fig. 2, the bag-like body 10 is a molded body in which the bag portion 11 whose diameter is narrower than the main body tube portion 2 and the axial end portion of the main body tube portion 2 on the opposite side of the opening end portion 3 is connected. . The bag portion 11 includes a base portion 12 that is connected to the main body tubular portion 2 (projecting portion 5) and formed into a substantially cylindrical shape, and a substantially conical top end that is connected to the base portion 12 and gradually decreases in diameter toward the axial end portion. Part 13. In the present embodiment, the pocket portion 11 is formed in a hollow shape in which the axial end portion (tip) is closed.

The base portion 12 includes a groove-shaped groove portion 14 (see FIG. 1 ) that is formed to extend in the circumferential direction along the extension portion 5 , and an axial end portion (tip side) that faces the groove portion 14 and faces the spring rubber seat 100 . The outer peripheral portion 16 of the inner peripheral surface of the main body portion 101. In the present embodiment, the outer peripheral portion 16 is formed in a truncated cone shape whose diameter gradually decreases toward the axial end portion (upper side in FIG. 2). The base portion 12 is located at a position closer to the axis O than the outer peripheral portion 16, and is provided at a plurality of positions (16 in the present embodiment) at a predetermined interval in the circumferential direction. The concave portion 17 is formed in a substantially elliptical shape extending in the axial direction (vertical direction in FIG. 2) as viewed from the side.

The distal end portion 13 is formed with a hole portion 18 as a pocket portion connected to the base portion 12. The hole portion 18 avoids a portion intersecting the axis O and is disposed at the base portion 12 Near the top end portion 13. In the present embodiment, the hole portion 18 is formed to penetrate the thickness of the distal end portion 13 and is formed in a substantially circular shape at one end of the distal end portion 13.

The bag body 10 is provided with a fragile portion 20 at the base portion 12 of the bag portion 11. The fragile portion 20 is a portion that is more likely to be broken than the main body tubular portion 2 or the distal end portion 13 and is provided along the overhang portion 5 over the entire circumferential direction. In the present embodiment, the fragile portion 20 includes a slit 21 that penetrates in the thickness direction of the outer peripheral portion 16 and extends in the circumferential direction, and a connecting portion 22 that is provided in the concave portion 17 on both sides in the circumferential direction of the slit 21, The sewing machine has a pinhole shape extending in the circumferential direction of the base portion 12 as a whole. The bag portion 11 is separated from the bag body 10 by the fragile portion 20, whereby the dust cover 1 is manufactured.

Next, an example of a method of manufacturing the bag body 10 will be described with reference to Fig. 3 . In the present embodiment, a case where the bag body 10 is manufactured by a blow molding method will be described. 3 is a schematic view for explaining a method of manufacturing the bag-shaped body 10. FIG. 3(a) is a schematic view showing an extrusion step of the parison 205, and FIG. 3(b) is a schematic view showing a gas injecting step. (c) in Fig. 3 is a schematic view showing the demolding and the final processing steps.

As shown in FIG. 3( a ), a pair of molding dies 201 and 202 having the inner surface of the cavity 203 corresponding to the outer shape of the dust cover 1 are prepared, and in the extrusion process, the nozzle 204 is heated by heating. The parison 205 of the softened molding material is extruded in a cylindrical shape and disposed between the molding dies 201 and 202.

Next, as shown in FIG. 3(b), the molding dies 201 and 202 are brought close to each other, and the parison 205 is extrusion-deformed at the upper and lower ends, thereby the cavity 203 (refer to (a) of FIG. 3). The inner parison 205 is configured in a bag shape. In the gas injection step, a blow needle (not shown) is blown in the hollow portion of the parison 205. The gas is introduced to deform the parison 205 in a radially expanded manner, and is pressed against the inner surface of the cavity 203. Thereby, the molded body 210 of a predetermined shape is formed.

After the molding die 210 is cooled and solidified by cooling the molding dies 201 and 202, as shown in FIG. 3(c), the molding dies 201 and 202 are separated from each other and released, and the molded body 210 is taken out from the molding dies 201 and 202. In the final processing step, the one end side in the axial direction of the molded body 210 is cut (cut) at the cutting line A by using a cutter (not shown) to form the opening end portion 3 (see FIG. 2). Further, a hole portion 18 is formed in the pocket portion 11 (see FIG. 2) of the molded body 210 using a cutter (not shown) such as a drill. Further, by using a cutter (not shown), the other end side of the molded body 210 in the axial direction is cut from the outer side in the radial direction along the cutting line B (the slit 21 and the connecting portion 22 are formed), thereby forming the fragile portion 20 (refer to figure 2). Thereby, the thin-walled bag body 10 is manufactured.

The fragile portion 20 will be described with reference to Fig. 4 . 4 is a cross-sectional view of the fragile portion 20 perpendicular to the axis O of the bag body 10. As shown in FIG. 4, the bag-like body 10 is provided with a plurality of recesses 17 provided in the outer peripheral portion 16 in the direction of the axis O from the outer peripheral portion 16. The cross section of the concave portion 17 in the direction perpendicular to the axis is formed in an arc shape. The amount of depression D from the surface of the outer peripheral portion 16 to the surface of the concave portion 17 is set to be larger than the thickness T of the outer peripheral portion 16. Preferably, it is set to D=T+α (however, α is a value in consideration of variations in thickness or core offset of the outer peripheral portion 16). The fragile portion 20 has a slit 21 formed in the outer peripheral portion 16, and a connecting portion 22 is formed in the recess portion 17.

The fragile portion 20 is formed by cutting the molded body 210 (see (c) in FIG. 3) along the cutting line B. Specifically, the slit 21 is formed by cutting a slit from the radially outer side of the molded body 210 in the circumferential direction by using a cutter (not shown). By setting the slit depth C of the cutter on the outer circumference of the molded body 210 to T < C < D, Thereby, the slit 21 and the connecting portion 22 penetrating the outer peripheral portion 16 are formed. As a result, the fragile portion 20 of the sewing machine pinhole shape in which the slit 21 is continuously formed in the circumferential direction is formed.

A method of assembling the dust cover 1 to the spring rubber seat 100 (annular member) (manufacturing method of the dust cover 1) and a manufacturing tool 30 for manufacturing the dust cover 1 will be described with reference to FIGS. 5 to 7 . 5 is a plan view of the manufacturing tool 30 of the dust cover 1, FIG. 6 is a cross-sectional view of the manufacturing tool 30 at the line VI-VI of FIG. 5, and FIG. 7 is inserted into the spring rubber seat 100 (annular member). Side view of the pocket 10. Further, a state in which the bag body 10 is inserted is shown in FIG.

As shown in FIGS. 5 and 6 , the manufacturing tool 30 is a jig for manufacturing the dust cover 1 in which the spring rubber seat 100 (annular member) is coupled to the main body tubular portion 2 , and includes a table portion 31 , a pillar 32 , and a head portion 33 . a wall portion 39 formed in a rectangular plate shape in plan view; the support post 32 is erected on the table portion 31; the head portion 33 is disposed at a top end of the support post 32; and the wall portion 39 is disposed at Around the pillars 32. Since the table portion 31 is provided with a pair of handles 41 at positions on both sides of the wall portion 39, the handle 41 can be grasped by both hands for transportation.

As shown in FIG. 6 , the support post 32 is a metal shaft-shaped member for setting the head portion 33 to a predetermined height, and is set to have substantially the same length as the axial length (free length) of the main body tubular portion 2 . Further, the size (thickness) of the cross section perpendicular to the axial direction of the strut 32 is set to be smaller than the inner diameter of the main body tubular portion 2.

The head portion 33 is a portion attached to the tip end of the stay 32 for supporting the pocket portion 11 of the bag-like body 10. In the present embodiment, the head portion 33 is a substantially cylindrical member made of synthetic resin surrounded by the abutting surface 34 which is the side surface of the truncated cone and the cylindrical side surface 34a which intersects the lower end edge of the abutting surface 34. The angle of the abutment surface 34 on the section containing the axis O will be the angle of the abutment surface 34 with respect to the axis O The degree is set to be the same as the angle with respect to the axis O of the distal end portion 13 of the bag body 10. Further, the outer diameter of the head portion 33 (the diameter of the lower end edge of the abutting surface 34) is set to be smaller than the diameter of the rib that the base portion 12 of the pocket portion 11 intersects with the tip end portion 13. The abutting surface 34 is formed in a recessed recess 35 at a portion intersecting the lower end edge.

The recessed portion 35 continues to extend on the side surface 34a from a position radially outward of the abutting surface 34 toward the radially outer side, and can be seen by forming the hole portion 18 in the pocket portion 11 in a state where the bag-like body 10 is covered. In the present embodiment, the concave portion 35 is formed in two places (refer to FIG. 5), and the angle (central angle) formed by the two lines connecting the concave portion 35 with the axis O is set to be about 65 degrees.

The head 33 is formed with a notch 36 at the center of the surface on the opposite side of the abutting surface 34, and the tip end of the strut 32 is inserted into the notch 36. An insertion hole 37 having a circular shape at an axial angle of view is formed at the center of the abutting surface 34, and the head portion 33 is fixed to the strut 32 by a bolt 38 inserted through the insertion hole 37.

The wall portion 39 is a metal member for positioning the spring rubber seat 100 with respect to the bag body 10, and is provided on the table portion 31 so as to surround the pillars 32. The wall portion 39 is formed in a cylindrical shape coaxial with the support post 32 and the head portion 33, and the inner diameter is set to be slightly larger than the outer diameter of the main body tubular portion 2 of the pouch body 10. When the dust cover 1 is manufactured, the wall portion 39 is formed on the axial end surface of the distal end surface 40 that abuts against the main body portion 101 of the spring rubber seat 100. The position (height) of the distal end surface 40 is set to an axial length from the abutting surface 34 where the pocket portion 11 abuts to the distal end surface 40, and an axis from the inner surface of the distal end portion 13 of the pocket portion 11 to the protruding portion 5. The length is the same.

A method of manufacturing the dust cover 1 using the manufacturing tool 30 will be described. First, as shown in FIG. 6, the bag body 10 covers the head portion 33, and the bag body 10 is inserted inside the wall portion 39. At this time, the wall portion is moved around the head 33 The pouch 10 in the 39 is adjusted in position so that the hole portion 18 formed in the pocket portion 11 overlaps with the recess 35 formed on the head portion 33.

Next, the spring rubber seat 100 is prepared (refer to FIG. 7). The operator grasps both ends of the flange portion 102 of the spring rubber seat 100 with both hands, so that the protruding portion 103 protruding inward in the radial direction of the main body portion 101 is along the outer peripheral portion 16 (base portion 12) of the pocket portion 11, in the slave The spring rubber seat 100 is lowered while the weight is applied above. Since the bag portion 11 is supported at a predetermined height by the stay 32 and the head portion 33, the bag portion 11 can be inserted into the main body portion 101 of the spring rubber seat 100 even if the bag body 10 is easily deformed. As a result, the operation load can be reduced as compared with the case where the bag-like body 10 (the bag portion 11) is inserted into the spring rubber seat 100 without using the manufacturing tool 30.

Since the pocket portion 11 has the fragile portion 20 (the connecting portion 22) formed in the base portion 12, when the base portion 12 (outer peripheral portion 16) of the pocket portion 11 is pressed against the spring rubber seat 100 in the axial direction of the spring rubber seat 100, The fragile portion 20 (the connecting portion 22) applies an axial tensile stress. The plurality of connecting portions 22 are provided in an axisymmetric manner, and the angle of the abutting surface 34 with respect to the abutting surface 34 of the axis O in the cross section including the axis O is set to be opposite to the tip end portion 13 of the bag body 10. Since the axis O has the same angle, it is possible to prevent an eccentric load acting on a part of the connecting portion 22. Thereby, when the bag portion 11 is inserted into the spring rubber seat 100, it is possible to prevent the fragile portion 20 from being broken.

Since the outer diameter of the head portion 33 is set smaller than the inner diameter of the base portion 12, a gap G1 is formed between the base portion 12 of the pocket portion 11 and the head portion 33. When the base portion 12 is inserted into the spring rubber seat 100, since the base portion 12 generates the elastic deformation gap G1 corresponding amount only in the radial inner side, it is possible to alleviate the action on the fragile portion 20 (continuously The axial tensile stress of the joint 22). Thereby, when the bag portion 11 is inserted into the spring rubber seat 100, it is possible to prevent the fragile portion 20 from being broken.

Since the distal end portion 13 of the pocket portion 11 is formed in a substantially conical shape, the rigidity of the distal end portion 13 of the pocket portion 11 can be improved, and the formation of the pocket can be reduced, compared to the case where the distal end portion 13 is formed into a substantially cylindrical shape with a bottom portion. The volume of the material of the portion 11 (in the present embodiment, a plastic resin). As a result, the pocket portion 11 can be easily inserted into the spring rubber seat 100, and the material of the separated bag portion 11 when the dust cover 1 is formed can be reduced. Further, since the bag portion 11 (the base portion 12 and the distal end portion 13) is formed in a narrow shape which gradually tapers as it goes from the main body tubular portion 2 toward the axial end portion, the spring rubber seat can thereby insert the bag portion 11 into the bag portion 11 The spring rubber seat 100 becomes easy.

In the base portion 12, the outer peripheral portion 16 is formed to have a conical shape with respect to the axis O being smaller than the tip end portion 13. Thereby, when the outer peripheral portion 16 enters the axial direction of the main body portion 101, the protruding portion 103 of the spring rubber seat 100 is gradually elastically deformed outward in the radial direction. The base portion 12 includes a contact surface portion 15 that is connected to the outer peripheral portion 16, and the contact surface portion 15 has an outer diameter that can contact the inner peripheral surface of the main body portion 101. Since the groove portion 14 is recessed between the contact surface portion 15 and the projecting portion 5, the projecting portion 5 of the bag-like body 10 is pressed onto the main body portion 101, and the elastic rubber seat 100 is protruded while being elastically deformed. When the portion 103 is restored to the inner side in the radial direction and is engaged with the groove portion 14, the movement of the spring rubber seat 100 in the axial direction is restricted. Further, when the contact surface portion 15 enters the main body portion 101, the movement of the bag-like body 10 in the radial direction is restricted. Thereby, the bag body 10 is fixed to the spring rubber seat 100.

In the wall portion 39, the axial length of the abutting surface 34 of the head portion 33 abutting from the bag portion 11 to the distal end surface 40 is the same as the bag abutting from the abutting surface 34. The position (height) of the distal end surface 40 is set such that the inner surface of the portion 11 (the distal end surface 13) has the same axial length as the protruding portion 5. Therefore, when the pocket portion 11 is inserted into the spring rubber seat 100, the end surface of the main body portion 101 in the axial direction contacts the distal end surface 40 of the wall portion 39. Since the projecting portion 5 is provided at the position where it is encountered, the spring rubber seat 100 can be accurately mounted at the position of the projecting portion 5. Further, since the end surface of the main body portion 101 in the axial direction hits the distal end surface 40 of the wall portion 39, the spring rubber seat 100 can be violently lowered, so that the operation time of the spring rubber seat 100 to be attached to the bag portion 11 can be shortened.

On the other hand, when the wall portion 39 is not provided, the strength portion of the fragile portion 20 is excessively extended, and a part (the portion having a small strength) of the main body tubular portion 2 enters the main body portion 101 of the spring rubber seat 100. Happening. In order to prevent such a situation, if the operation of attaching the spring rubber seat 100 to the bag portion 11 is performed with care, the operation time is prolonged. According to the present embodiment, it is possible to solve these problems and accurately mount the spring rubber seat 100 to the position of the extension portion 5 in a short time.

After the bag-like body 10 is fixed to the spring rubber seat 100, a tool (not shown) such as a flat nose pliers or a screwdriver is inserted into the hole portion 18 (see FIG. 6) and the recessed portion 35, and the arrow portion R direction is applied to the pocket portion 11 (撬The force of the moving direction is used to open the pocket portion 11 using a tool. Thereby, a part of the fragile portion 20 (the connecting portion 22) is biased, and a part of the connecting portion 22 can be broken. As a result, since the effective area of the connecting portion 22 is reduced, when the force in the axial direction (the direction of the axis O) to the direction of the arrow R (the swaying direction) is continuously applied to the bag portion 11, the connecting portion 22 cannot support the weight and is completely broken. Thereby, the pocket portion 11 (all of the distal end portion 13 and a part of the base portion 12) is removed. Thereby, the interpolating end portion 4 (refer to FIG. 1) is opened. The dust cover 1 of the mouth can be assembled to the spring rubber seat 100. The removed bag portion 11 can be reused as a molding material of the other bag-like body 10.

In a state where the pocket portion 11 covers the abutting surface 34, the recessed portion 35 is formed at a position that can be seen through the hole portion 18, so that the tool can be easily inserted into the hole portion 18. Further, since the recessed portion 35 (see FIG. 6) is continuously formed in a notch shape from the abutting surface 34 to the side surface 34a, the tip end of a tool (not shown) inserted into the hole portion 18 can be inserted between the side surface 34a and the base portion 12. Gap G1. Since the pocket portion 11 can be opened by the tool by pressing the concave portion 35 as a fulcrum while pressing the inner surface of the base portion 12, the operation of breaking the fragile portion 20 can be easily performed with a small force.

Since the main body tubular portion 2 of the bag-like body 10 is inserted into the wall portion 39, in the case where the force in the arrow R direction (the swaying direction) is applied to the pocket portion 11, the main body tubular portion 2 is restricted by the wall portion 39 along the axis. Move in a right angle or in the axial direction. Thereby, the operator can easily break the fragile portion 20 without pressing the bag body 10 by hand. Further, in the breaking operation of the fragile portion 20, the protruding portion 5 can be prevented from entering the main body portion 101 of the spring rubber seat 100 by the wall portion 39.

Here, the fragile portion 20 of the bag-like body 10 is not formed into a needle hole shape of a sewing machine, and is subjected to processing such as scratching or fine continuous slit (non-penetrating hole portion) or the side of the bag portion 11 which is formed to be separated from each other. By welding to the side of the main tubular portion 2, it is also possible to easily break the position from which the machining is performed or the position where the welding is performed.

However, in the case of performing processing such as scratching or fine continuous slits (non-penetrating holes), since the thickness of the outer peripheral portion 16 is small, high processing accuracy is required. In addition, due to the thickness or processing of the outer peripheral portion 16 The deviation easily causes a variation in the breaking load of the formed fragile portion 20. As a result, when the bag-like body 10 is inserted into the main body portion 101 of the spring rubber seat 100, the possibility that the fragile portion is accidentally broken before the bag-shaped body 10 is fixed at a predetermined position is increased. Further, in the case where the side of the bag portion 11 which is formed apart from each other is welded to the side of the main body tube portion 2, the welding operation time is required, and the breaking weight of the welded portion is likely to vary.

On the other hand, when the recessed portion 17 is provided in the outer peripheral portion 16 (see FIG. 4) and the slit 21 and the connecting portion 22 are formed by adjusting the depth of the slit of the cutter (not shown), the concave portion 17 is set. The amount of depression, the circumferential length, the curvature, and the like can easily ensure the effective area of the connecting portion 22. As a result, it is possible to suppress variation in the breaking load of the fragile portion 20 due to the thickness of the outer peripheral portion 16 or the machining variation. Further, since the fragile portion 20 can be formed in the final processing step (see FIG. 3(c)), the operation load can be reduced.

Since the connecting portion 22 is formed in the recess 17 provided in the recessed portion of the outer peripheral portion 16, when the fragile portion 20 is broken, the shearing stress can be applied to the connecting portion 22 from the circumferential direction. As a result, the fragile portion 20 can be broken with a small force as compared with the case where the axial tensile stress is applied to the connecting portion 22.

Here, in the case where the inner surface of the pocket portion 11 (refer to FIG. 2) is axially pressed by the head 33 using the manufacturing tool 30 while the pocket portion 11 is inserted into the spring rubber seat 100, the axial direction is applied to the fragile portion 20. Since the tensile stress is applied, the fragile portion 20 can be prevented from being broken. On the other hand, after the bag portion 11 is inserted into the spring rubber seat 100, when the bag portion 11 is removed, shear stress is applied to the fragile portion 20, so that the fragile portion 20 can be easily broken. That is, it is possible to simultaneously have the operational reliability of inserting the pouch body 10 into the spring rubber seat 100, and The fragile portion 20 is broken to remove the operational reliability of the pocket portion 11.

On the connecting portion 22, the circumferential length is set to be smaller than the circumferential length of the slit 21. Thereby, compared with the case where the circumferential length of the slit 21 is set to be smaller than the circumferential length of the connecting portion 22, the fragile portion 20 can be broken with a small force.

Since the bag-shaped body 10 opens the insertion end portion 4 by removing the pocket portion 11, the piston rod 112 of the damper 110 can be inserted. Further, since the insertion portion 4 can be opened without breaking the fragile portion 20 without using a cutter, it is possible to prevent the cutter from scratching the spring rubber seat 100 or causing injury to the hand. Furthermore, since the tool is not used, the operator does not need to pick up and lower the tool. Therefore, the production interval of this portion can be shortened.

Since the outer peripheral portion 16 is reduced in diameter (conical shape) as the bag-like body 10 faces the distal end portion 13 side, a gap G2 is formed between the main body portion 101 of the spring rubber seat 100 and the outer peripheral portion 16. Since the gap G2 gradually increases toward the distal end side of the pocket portion 11, the hole portion 18 can be used to easily tilt the axis O of the pocket portion 11 by the gap portion G2. Thereby, the force in the arrow R direction (the sway direction) can be easily applied to the bag portion 11. As a result, a force of an axial component is applied to the fragile portion 20, and a force of the radial component can be applied. Thereby, since the load can be easily concentrated on a part of the fragile portion 20, the fragile portion 20 can be effectively broken.

The hole portion 18 avoids a portion intersecting the axis O and is provided on the distal end portion 13 in the vicinity of the base portion 12. Thereby, the fragile portion 20 located on the opposite side of the hole portion 18 with the axis O interposed therebetween serves as a fulcrum, and the force can be effectively applied to the fragile portion 20 in the vicinity of the hole portion 18 (the axial extension line). Thereby, in the case where the hole portion 18 is provided at a portion intersecting the axis O, the fragile portion 20 can be made with a small force. fracture.

Since the concave portion 35 is formed at two places of the distal end portion 33 (two places on the left and right sides of the handle 41 side), the right or left concave portion 35 is aligned with the position of the hole portion 18 by the dominant hand corresponding to the operator, thereby enabling the concave portion 35 to be aligned with the position of the hole portion 18 corresponding to the operator's dominant hand. The operation of breaking the fragile portion 20 is easy to perform regardless of the operator on the right side or the operator on the left side. Further, since the angle formed by the two lines connecting the concave portion 35 and the axis O is set to substantially 65°, the concave portion 35 is placed on the front side of the operator by arranging the manufacturing tool 30, and a tool (not shown) can be inserted into the hole. In the portion 18, the fragile portion 20 is easily broken.

The present invention has been described above with reference to the embodiments. However, it is to be understood that the invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the invention. For example, the shape or the number of the recesses 17 or the holes 18, the circumferential length or the axial width, the shape or the number of the slits 21 or the connecting portions 22, and the like can be appropriately set. As long as the hole portion 18 can pass through, it is of course also possible to have an elliptical shape or a square shape.

In the above-described embodiment, the case where the bag-like body 10 as the semi-finished product of the dust cover 1 is integrally molded by blow molding has been described. However, the bag body 10 is not necessarily limited thereto, and the bag body may be manufactured by another molding method. 10. As another molding method, for example, injection molding is mentioned.

When the bag-shaped body 10 is manufactured by blow molding, after the hollow molded body 210 (see FIG. 3(c)) is molded, the open end portion 3 and the fragile portion 20 are formed by cutting with a cutter. On the other hand, in the case of manufacturing the bag-like body 10 by injection molding, since it is not necessary to pass through the hollow molded body 210, it is not necessary to form the open end portion 3 and the fragile portion by cutting the cutter. 20. In the case of injection molding, since the outer shape of the bag body 10 is determined by the shape of the inner surface of the cavity of the injection molding die, the opening end portion 3 or the fragile portion 20 can be manufactured by appropriately designing the injection molding die. The formed pouch 10 is formed.

When the bag-like body 10 is manufactured by injection molding, the thickness of the bag-shaped body 10 can also be set relatively easily. Therefore, by appropriately designing the injection molding die, instead of forming the fragile portion 20 (the slit 21 and the connecting portion 22) by cutting, the thickness can be controlled by integral molding, and a fine continuous slit can be provided on the fragile portion 20 ( Non-through holes), through holes, embossing, small thickness portions, slits, and the like. Thereby, of course, the fragile portion 20 can be broken.

In the above-described embodiment, the case where the bag-like body 10 is manufactured by blow molding has been described. Therefore, the bag portion 11 is formed in a hollow shape in which the axial end portion is closed. However, it is not necessarily limited to this. When the axial end side (front end side) of the bag portion 11 is smaller than the main body tubular portion 2, the through hole penetrating the base portion 12 or the distal end portion 13 in the thickness direction may be formed on the base portion 12 or the distal end portion 13. When the bag-like body 10 is inserted into the spring rubber seat 100, the bag portion 11 is for squeezing in the axial direction (up and down direction in FIG. 6) by the abutting surface 34 of the head portion 33 inserted from the opening end portion 3 (refer to FIG. 2). Since the size of the contact surface 34 is set to be larger than the through hole or the through hole is provided at a position where the contact surface 34 is pressed, the support member 32 and the head portion 33 can be used to support the bag body. 10.

In the case where the bag-shaped body 10 is manufactured by blow molding, for example, in the final processing step (see FIG. 3(c)), a tool (not shown) is used to be closer to the axial direction than the cutting line B. The position cutting pocket portion 11 on the end side is formed. In addition, in the case of manufacturing the bag body 10 by injection molding, A convex portion for forming a through hole is formed in the injection molding die, and the through hole is integrally molded with the bag portion 11.

In the above-described embodiment, the case where the hole portion 18 of the bag portion 11 is formed in the bag portion 11 has been described. However, the present invention is not limited thereto, and it is of course possible to use a convex or concave pick-up portion instead of the hole portion 18 in the bag portion 11. The convex or concave take-up portion can be integrally molded with the main body tubular portion 2 and the bag portion 11 by blow molding or injection molding. By providing the pick-up portion on the pocket portion 11 at a portion that intersects the axis O, the tip end portion 33 can be pressed to insert the bag-like body 10 into the spring rubber seat 100. After the bag-like body 10 is inserted into the spring rubber seat 100, the pick-up portion formed by avoiding the portion intersecting the axis O is removed by a tool such as a flat nose pliers, and the bag portion 11 is pulled by the pick-up portion. That is, the force in the swaying direction can be applied to the fragile portion 20. Thereby, the fragile portion 20 can be easily broken.

In the above-described embodiment, the case where the dust cover 1 is inserted into the spring rubber seat 100 has been described as an example of the annular member. However, the annular member is not limited to the spring rubber seat 100. Of course, the member that is inserted into the axial end portion of the dust cover 1 may be another annular member (tubular member). As another annular member, for example, a fixing device is exemplified. Further, the annular member is not limited to being constituted by a rubber-like elastic body. Of course, a tubular member made of metal or synthetic resin constituting a part of the fixing device may be used as the annular member.

In the above-described embodiment, the protruding portion 103 (see FIG. 1) is protruded from the spring rubber seat 100, and the groove 1 that is engaged with the protruding portion 103 is formed in the dust cover 1 that is inserted into the spring rubber seat 100. The case of 14 has been described, but it is not necessarily limited to this. Of course, the protrusion 103 can also be omitted or The groove portion 14 holds the insertion end portion 4 of the dust cover 1 with the elasticity of the spring rubber seat 100.

In the above embodiment, the support member 32 and the head portion 33 of the manufacturing tool 30 are formed of separate members and are joined by the bolts 38. However, the present invention is not limited thereto, and the pillars 32 and the heads may of course be used. 33 integral molding (made as a part).

In the above-described embodiment, the case where the wall portion 39 is formed by a cylindrical member has been described. However, the present invention is not limited thereto, and it is of course possible to arrange a plurality of piles so as to surround the pillars 32 and the like. The structure of the component. The wall portion 39 restricts the movement of the main body tubular portion 2 inserted into the inner side in the direction perpendicular to the axis, as long as the position of the spring rubber seat 100 in the axial direction can be restricted by the distal end surface 40.

In the above-described embodiment, the case where the extension portion 5 protrudes in a flange shape over the entire circumference of the main body tubular portion 2 has been described. However, the protruding portion 5 may be provided intermittently at intervals in the circumferential direction of the main body tubular portion 2, of course.

In the above-described embodiment, the case where the operator grasps the spring rubber seat 100 by hand and inserts the pocket portion 11 into the spring rubber seat 100 by using the manufacturing tool 30 has been described, but the present invention is not limited thereto. Of course, it is also possible to use an actuator that can reciprocate in the axial direction to relatively move the strut 32, the head portion 33, and the spring rubber seat 100 in the axial direction, and insert the pocket portion 11 into the spring rubber seat 100.

2‧‧‧ Body tube

3‧‧‧Open end

5‧‧‧Outreach

10‧‧‧Bag

11‧‧‧ Bag Department

12‧‧‧ base

13‧‧‧Top part

14‧‧‧Slots

18‧‧‧ Hole Department

30‧‧‧Manufacturing tools

31‧‧‧Department

32‧‧‧ pillar

33‧‧‧ head

34‧‧‧Abutment

34a‧‧‧Cylindrical side

35‧‧‧ recess

36‧‧‧ Notch

37‧‧‧ inserted through hole

38‧‧‧ bolt

39‧‧‧ wall

40‧‧‧ top surface

41‧‧‧Handle

G1‧‧‧ gap

Claims (5)

A manufacturing tool for a dust cover, comprising: a cylindrical main body cylinder portion that is disposed to surround an outer circumference of a piston rod of a damper of a vehicle, and is coupled to an annular member attached to a vehicle body side, the manufacturing tool The main body tubular portion is provided with a pocket portion connected to the axial end portion, and the pocket portion is formed with a fragile portion that is more easily broken than the main tubular portion in the circumferential direction; the manufacturing tool is provided with a pillar And a head; the pillar is inserted into a pocket formed by connecting an axial end portion of the main body barrel portion to the pocket portion; the head portion is disposed at a top end of the pillar while being covered by the pocket portion And the bag portion is inserted into the annular member in a state of abutting against the head portion, and the end portion between the fragile portion and the main body barrel portion is fixed to the At the same time as on the annular member, the fragile portion breaks and removes the axial end side. The manufacturing tool according to claim 1, comprising: a wall portion that is disposed around the pillar and that is inserted into the inner side of the main body tubular portion; and the wall portion is provided with the annular member The axial end face abuts the top end face. The manufacturing tool according to claim 2, wherein the main body tubular portion has a projecting portion that protrudes radially outward from an axial end portion from an inner diameter of the annular member; The position of the distal end surface of the wall portion is set to an axial length from the abutting surface of the head portion where the pocket portion abuts to the distal end surface, and a portion abutting from the abutting surface The axial length of the inner surface of the pocket portion to the protruding portion with. The manufacturing tool according to any one of claims 1 to 3, wherein the bag portion includes a hole portion that penetrates a portion intersecting the axis of the main body tube portion and penetrates in a thickness direction; And the head portion is formed with a concave portion that can be seen through the hole portion in a state covered by the pocket portion. A method of manufacturing a dust cover having a cylindrical main body tubular portion that is disposed to surround an outer circumference of a piston rod of a damper of a vehicle and coupled to an annular member attached to a vehicle body side, the method features The preparation step includes a preparation step, a coating step, an interpolation step, and a removal step. In the preparation step, a bag-like body is formed which forms a fragile portion which is more easily broken than the main body tube portion in the circumferential direction. The bag portion is connected to the axial end portion; in the covering step, the bag portion of the bag body is covered on a head portion provided at a tip end of the pillar; in the interpolation step, the bag portion is covered The pocket portion on the head is inserted into the annular member; and in the removing step, the end portion between the fragile portion and the main body tubular portion is fixed to the ring shape In the state of the component, the fragile portion is broken, and is retained and fixed to the end portion of the annular member and the axial end portion side is removed.