JPH0594548U - Pressure vessel for air suspension - Google Patents

Abstract

(57) [Abstract] [Purpose] An outer cylinder made of resin, a partition wall made of resin that divides the inside at an intermediate portion in the axial direction, an inner cylinder provided in the outer cylinder, and an inner cylinder thereof. And a metal member having a bottom wall portion provided between the one end side of the outer cylindrical portion,
A pressure vessel for an air suspension whose inner diameter on the other end side of the outer cylinder is smaller than that of other parts of the outer cylinder is low cost while ensuring the quality of resin molded products and the degree of freedom in design. Provided by. [Structure] A resin partition wall member 18 forming a partition wall portion is sandwiched between a stepped surface 26 of a resin outer cylinder member 12 forming an outer cylinder portion and a ring-shaped member 28 fixed to an inner cylinder portion 20. Thus, the relative position of the partition member 18 to the outer cylinder member is fixed, and the O-ring 3 is provided between the partition member 18 and the outer cylinder member 12.
2 is hermetically sealed. Even if there is the small diameter portion 60, it is not necessary to use a split core or a core capable of reducing the diameter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is directed to an outer cylinder made of resin, a partition wall made of resin that divides the inside at an intermediate portion in the axial direction, an inner cylinder provided in the outer cylinder, and the inner cylinder and the outer cylinder. And a metal member having a bottom wall portion provided between the outer cylinder portion and one end side of the outer cylinder portion, and the inner diameter of the outer cylinder portion at the other end side is smaller than that of the other portion of the outer cylinder portion. The present invention relates to a pressure vessel for suspension.

[0002]

[Prior Art]

 A resin outer cylinder part, a resin partition wall part dividing the inside of the outer cylinder part at an axial center part thereof, and an outer cylinder part provided inside the outer cylinder part and airtightly contacting the partition wall part at one end side. And an annular and plate-shaped inner cylindrical portion, which is integrally provided at the other end side of the inner cylindrical portion at the inner peripheral edge portion and airtightly crimped to one end side of the outer cylindrical portion at the outer peripheral edge portion. There is known a pressure vessel for an air suspension including a metal member having a bottom wall portion. For example, the one described in Japanese Patent Application Laid-Open No. 63-187745, which was filed by the applicant of the present invention earlier, is such. In this pressure container for air suspension, the above-mentioned resin outer cylinder part and The partition wall is integrally molded, and the outer peripheral end of the diaphragm made of an elastic material is fixed to the outer peripheral surface on one end side of the outer cylinder while being clamped by a ring-shaped member. There is. One type of such pressure vessel for air suspension is, for example, that the volume inside the outer cylinder is as large as possible under the condition that the installation space on the one end side of the outer cylinder at the time of assembly to the vehicle is restricted. In order to ensure a large size, one end side of the outer tubular part is narrowed to the inner peripheral side, and thus the inner diameter of the one end side of the outer tubular part is made smaller than the other part of the outer tubular part.

[0003]

[Problems to be solved by the device]

 However, when integrally molding the outer cylinder part and the partition wall whose inner diameter on one end side is smaller than the other part as described above, there is an undercut inside the one end side of the outer cylinder part. Therefore, it was necessary to divide the mold core into a plurality of pieces in the circumferential direction. For this reason, in mass production, when the robot is used to load the core into the mold in an assembled state and to disassemble and take out the core from the molded product, the core is assembled and loaded / disassembled. There is a problem in that the time required for the unloading operation becomes long and the molding cycle becomes long, and the molding apparatus becomes complicated and expensive, which increases the cost of the pressure vessel for air suspension. Further, since the core is divided into a plurality of parts, the split core may be worn or deformed during repeated molding, which may cause burrs or the like on the molded product and impair its quality.

On the other hand, if a core configured to be capable of reducing the diameter is assembled in a mold and the molded product is automatically taken out by using the opening / closing operation of the mold, an undercut is made in the outer cylinder part. However, since the core division and the assembly and loading / disassembling / unloading operations of the core by the robot are not required, the outer cylinder part and the bulkhead part can be easily and quickly integrally formed. It is considered that the cost can be reduced appropriately. However, even in this case, when the above-mentioned undercut is relatively large, there are the following problems. That is, it is unavoidable that the use of such a core capable of reducing the diameter greatly increases the thickness of the mold and complicates the mold structure, resulting in a large increase in mold cost. It cannot always be said that costs can be reduced appropriately. In addition, since a core that can be reduced in diameter is structurally difficult to obtain sufficient strength, the quality of the resin molded product may not be sufficiently obtained due to insufficient strength of the core, and the core may not shrink. Since it is relatively difficult to secure a large diametrical dimension, there is a drawback that the degree of freedom in designing a resin molded product cannot be obtained sufficiently.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make a resin-made outer cylinder portion and a resin-made outer cylinder portion that divides the inside at an axially intermediate portion. A partition member, a metal member having an inner tubular portion provided inside the outer tubular portion and a bottom wall portion provided between the inner tubular portion and one end side of the outer tubular portion, and the outer tubular portion thereof. To provide a pressure vessel for an air suspension whose inner diameter on the other end side is smaller than that of the other part of the outer cylinder, at low cost while ensuring the quality and design flexibility of the resin molded product. Especially.

[0006]

[Means for Solving the Problems]

 The gist of the present invention for achieving the above-mentioned object is to provide an outer cylindrical portion made of resin, a partition wall made of resin for dividing the outer cylindrical portion at an intermediate portion in the axial direction thereof, and the outer cylindrical portion of the outer cylindrical portion. An inner cylinder portion provided inside and contacting the partition wall airtightly on one end side, and an annular and plate-shaped inner cylinder portion integrally provided on the other end side of the inner cylinder portion at the inner peripheral edge portion, and A metal member having a bottom wall portion that is airtightly crimped to one end side of the outer cylinder portion at the outer peripheral edge portion, and an airtight main chamber is formed on the opposite side of the partition wall portion from the bottom wall portion side. While forming an annular airtight sub-chamber on the bottom wall side of the partition wall, the inner diameter of the other end side of the outer cylinder part is smaller than the other part of the outer cylinder part. A pressure vessel for an air suspension of the type: A resin-made partition wall member, (b) a resin-made outer cylinder member that has a stepped surface on the inner peripheral surface for receiving the resin-made partition member, and constitutes the outer cylinder part, and (c) the metal-made member. When the outer peripheral edge of the bottom wall of the metal member is crimped to one end of the resin outer cylinder member provided on the stepped surface and receiving the resin partition member on the stepped surface, the resin And a pressing member that presses the partition wall member against the stepped surface, and (d) a seal member that hermetically seals between the resin partition wall member and the resin outer cylinder member. ..

[0007]

[Action]

 With this configuration, the outer peripheral edge of the bottom wall of the metal member is air-tightly attached to one end of the resin outer cylinder member while the resin partition member is received on the stepped surface in the resin outer cylinder member. When caulking, one end side of the inner cylindrical portion of the metal member is brought into air-tight contact with the resin partition member, and the resin partition member is provided with the pressing portion provided on the inner cylindrical portion and the stepped surface. The resin partition member is fixed in the axial direction and the position around the axial center by being pinched between and. In this case, the space between the resin partition wall member and the resin outer cylinder member is hermetically sealed by a seal member. As a result, an airtight main chamber and subchamber are formed in the resin outer cylinder member.

[0008]

[Effect of the device]

 Therefore, according to the pressure vessel for air suspension of the present invention, even if the inner diameter of the other end of the outer cylinder is smaller than the other part of the outer cylinder, the resin outer cylinder forming the outer cylinder is formed. Since there is no undercut inside the resin-made outer cylinder member when molding the member, the resin-made outer cylinder member does not have to divide the core of the mold or use a core that can be reduced in diameter. Can be molded. As a result, the molding cycle of the resin outer cylinder member can be shortened and the molding apparatus can be constructed at a low cost, and the resin outer cylinder member can be shortened as compared with the conventional case in which the core assembly / disassembly / removal work by the robot is required. Also, it is possible to suitably reduce the die cost as compared with the die in which the core for which the diameter can be reduced is used although the die for molding the resin partition member is separately required. In this case, further, the resin partition wall member can be molded quickly, and when the metal member is caulked to the resin outer cylinder member, the pressing portion of the metal member and the resin outer cylinder member are The relative position of the resin partition member with respect to the resin outer cylinder member is fixed by not only pressing the resin partition member with the stepped surface but requiring a separate fixing step. As a result, the cost of the pressure vessel for air suspension can be suitably reduced as compared with the case where the resin outer cylinder portion and the partition wall portion are integrally molded.

Further, since it is not necessary to use a split core that easily causes burrs or a core that can be reduced in diameter and that is difficult to sufficiently secure strength and a reduced diameter dimension, the quality of resin molded products and the degree of freedom in design are reduced. Without the above effect.

[0010]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, an air suspension pressure vessel (hereinafter abbreviated as a pressure vessel) 10 has a cylindrical shape as a whole, and a resin outer cylinder member (hereinafter, outer cylinder) that constitutes a resin outer cylinder part. Member) 12 and a first cylindrical protrusion 14 having a relatively high height on the inner peripheral side of the annular disc portion 13 and a first cylindrical protrusion 14 on the outer peripheral side of the disc portion 13. And a second cylindrical protrusion 16 having a relatively low height protruding toward the opposite side to divide the inside of the outer cylinder member 12 at an axially intermediate portion of the outer cylinder member 12 to form a partition wall made of resin. A resin partition wall member (hereinafter abbreviated as a partition wall member) 18 and a metal having a bottomed cylindrical shape and fitted on the inner peripheral surface of the first cylindrical protruding portion 14 of the partition wall member 18 on the bottom side. Made of an inner cylindrical portion 20 and an annular and plate-shaped inner peripheral edge portion of the inner cylindrical portion 20 at the outer circumference of the opening side. A metal member 24, which is airtightly fixed to the surface by welding and has an outer peripheral edge portion made of a metal bottom wall portion 22 which is crimped to one end portion of the outer tubular member 12, is provided.

An annular stepped surface 26 that is perpendicular to the axis of the outer tubular member 12 is provided on the inner peripheral surface of the outer tubular member 12, and the inner tubular portion 20 of the metal member 24 is provided. A ring-shaped member 28 having a plate shape is fixed to the outer peripheral surface of the by welding. The partition wall member 18 and the stepped surface 26 with which the outer peripheral edge portion of the disk portion 13 abuts with the second cylindrical protruding portion 16 fitted to the inner peripheral surface of the outer tubular member 12 The tip end surface of the cylindrical projecting portion 14 is clamped between the abutting ring-shaped member 28 and the ring-shaped member 28 in a direction parallel to the axial center, thereby fixing the relative position with respect to the outer tubular member 12 in the axial direction and the axial center. Has been done. In this embodiment, the ring-shaped member 28 constitutes a pressing portion.

Between the partition member 18 and the outer cylinder member 12, between the second cylindrical protrusion 16 of the partition member 18 and the annular recess 30 provided on the inner peripheral surface of the outer cylinder member 12. The partition wall member 18 and the inner cylindrical portion 20 of the metal member 24 are sealed in an airtight manner by an O-ring 32 inserted in the inside of the first cylindrical protruding portion 14 of the partition wall member 18. It is hermetically sealed by an O-ring 36 provided between the annular recess 34 provided on the peripheral surface and the inner tubular portion 20. An O-ring 38 hermetically seals between the outer cylinder member 12 and the bottom wall portion 22 of the metal member 24. As a result, an airtight main chamber 40 is formed on the side opposite to the bottom wall 22 side (lower side in FIG. 1) with the partition member 18 in the outer cylinder member 12 interposed therebetween, and the outer cylinder is formed. An annular airtight sub-chamber 42 is formed on the bottom wall 22 side with the partition member 18 in the member 12 interposed therebetween. In this embodiment, the O-ring 32 constitutes the seal member.

In the stepped hole 44 provided so as to penetrate in the thickness direction in the portion of the outer cylinder member 12 located on the side of the main chamber 40, a connecting fitting 48 having a communication hole 46 is attached to, for example, an ultrasonic insert. Air is supplied to the inside of the main chamber 40 through a not-shown notch in a rubber member 50 (hatching is omitted) fixed to the connecting fitting 48 so as to close the communication hole 46. .. On the other hand, a relatively large-diameter through hole 52 is provided in the bottom of the inner tubular portion 20, and a pair of relatively small diameters are provided in the peripheral wall of the inner tubular portion 20 at opposite positions. Through holes 54 are provided. This allows the two chambers 40, 42 to communicate with each other through the through holes 52, 54.

The pressure vessel 10 configured as described above is fixed to a sprung member of a vehicle by, for example, a plurality of bolts 56 (only two are shown in FIG. 1) protruding from the bottom wall portion 22. In addition, a piston rod of a shock absorber (not shown) attached to the unsprung member of the vehicle is inserted into the inner cylindrical portion 20 from the main chamber 40 side through the through hole 52.

At the end of the outer cylinder member 12 on the main chamber 40 side, a small diameter portion 60 having an inward flange 58 at the tip and having a smaller diameter than the other portion of the outer cylinder member 12 is formed. There is. On the outer peripheral surface of the small-diameter portion 60, the outer peripheral side end of a diaphragm 62 made of an elastic material is fixed in a state of being clamped by a ring-shaped member 64, and the inner peripheral surface of the diaphragm 62 is fixed. The side ends are directly or indirectly fixed to the cylinder of the shock absorber. In FIG. 1, reference numeral 66 is a backup ring, which is integrally provided on the inner peripheral surface of the small diameter portion 60 by press fitting, for example.

The pressure vessel 10 is manufactured, for example, as follows. That is, first, the outer cylinder member 12 and the partition member 18 are each molded with a resin material such as nylon, and the connecting fitting 48 is ultrasonically inserted into the stepped hole 44 of the outer cylinder member 12 and the outer cylinder member 12 is The backup ring 66 is pressed into a predetermined position on the inner peripheral surface. At the time of molding, since there is no undercut inside the outer cylindrical member 12, the core of the mold for molding it may be a single core that is not divided in the circumferential direction. Next, after the second cylindrical protruding portion 16 of the partition member 18 is fitted to the inner peripheral surface of the outer tubular member 12 via the O-ring 32, the inner tubular portion 20 of the metal member 24 is fitted to the partition member 18. The bottom wall portion 22 of the metal member 24 is fitted to the inner peripheral surface of the first cylindrical protruding portion 14 via an O-ring 36, and the bottom wall portion 22 of the metal member 24 is fixed to one end surface of the outer cylindrical member 12 via an O-ring 38. While pressing the partition wall member 18 between the ring-shaped member 28 and the stepped surface 26 by pressing with a pressing force, the outer peripheral edge portion of the bottom wall portion 22 thereof is crimped to one end side of the outer tubular member 12. Thereby, the pressure vessel 10 of FIG. 1 is obtained. It should be noted that when the bottom wall portion 22 is pressed against the one end surface of the outer tubular member 12, the partition member 18 can be suitably pinched between the ring-shaped member 28 and the stepped surface 26. The fixed position and the like of the member 28 are predetermined.

As described above, according to the present embodiment, the resin-made outer cylinder portion and the partition wall portion of the pressure vessel 10 are molded separately from each other by the outer cylinder member 12 and the partition member 18, so that the outer cylinder member 1 Even if the small diameter portion 60 is formed on one end side of the outer cylindrical member 2 and the inner diameter of the small diameter portion 60 is smaller than the other portion of the outer cylindrical member 12, when the outer cylindrical member 12 is molded, the outer cylindrical member 12 Since there is no undercut inside, the outer cylinder member 12 can be molded without dividing the mold core or using a core capable of reducing the diameter. As a result, the molding cycle of the outer cylinder member 12 can be shortened and the molding apparatus can be constructed at low cost, and the outer cylinder member can be shortened as compared with the conventional case in which the assembly and loading / disassembling / unloading work of the core by the robot is required. Although a mold for molding 12 and the partition member 18 is separately required, the mold cost can be suitably reduced as compared with a mold in which a core capable of reducing the diameter is used. In this case, further, the partition member 18 can be molded quickly, and when the metal member 24 is caulked to the outer tubular member 12, the ring-shaped member 28 of the metal member 24 and the step of the outer tubular member 12 are formed. The relative position of the partition member 18 with respect to the outer cylinder member 12 is fixed only by sandwiching the partition member 18 with the attaching surface 26 without a separate fixing step. Therefore, it is possible to preferably reduce the cost of the pressure vessel 10 as compared with the case where the resin outer cylinder portion and the partition wall portion are integrally molded.

Further, according to the present embodiment, a split core that easily causes burrs as in the case where the resin outer cylinder portion and the partition wall portion are integrally molded and a core that can be reduced in diameter so that it is difficult to sufficiently obtain strength and diameter reduction dimension Since it is not necessary to use, the above effect can be obtained without lowering the quality and the degree of freedom in design of the resin molded product, as compared with the case where the resin outer cylinder part and the partition wall part are integrally molded.

Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other aspects.

For example, in the above embodiment, the stepped surface 26 is provided at a right angle to the axial center of the outer tubular member 12, but it is not always necessary, and it may be provided in a tapered shape, for example. In this case, the partition wall member 18 is preferably provided with a tapered portion that can be fitted into the tapered stepped surface.

Further, in the above embodiment, the stepped surface 26 is provided in an annular shape, but a plurality of steps may be provided at predetermined intervals in the circumferential direction of the outer tubular member 12.

Further, in the above-mentioned embodiment, the pressing portion is constituted by the ring-shaped member 28 fixed to the outer peripheral surface of the inner cylindrical portion 20 by welding, but this is not always necessary. It may be composed of a plurality of protrusions provided on the outer peripheral surface of the portion 20 at predetermined intervals in the circumferential direction, or, as shown in FIG. 2, provided on the tip side of the inner peripheral surface of the inner cylindrical portion 68. It may be configured by the annular stepped surface 70, or may be configured by the bottom portion of the inner cylindrical portion 20.

Further, in the above-described embodiment, the O-ring 32 is housed in the annular recess 30 provided in the inner peripheral surface of the outer tubular member 12, but, for example, as shown in FIG. The O-ring 32 may be housed in the annular recess 74 formed on the outer peripheral surface of the second ring 2.

Further, in the above embodiment, the O-ring 36 is housed in the annular recess 34 provided in the inner peripheral surface of the first cylindrical protruding portion 14 of the partition member 18, but as shown in FIG. 2, for example. As described above, the O-ring 38 is housed in the annular recess 76 provided in the outer peripheral surface of the first cylindrical protruding portion 14 such that the first cylindrical protruding portion 14 is fitted into the inner peripheral surface of the inner cylindrical portion 68. Alternatively, or as shown in FIG. 4, a ring-shaped member 78 having an L-shaped cross section, which functions as a pressing portion, is fixed to the outer peripheral surface of the inner tubular portion 20 and the ring-shaped member 78 and The O-ring 38 is housed in an annular recess 76 provided on the outer peripheral surface of the first cylindrical protruding portion 14 so that the first cylindrical protruding portion 14 is fitted in the annular space between the cylindrical portion 20 and the cylindrical portion 20. You may do so.

Further, in the above-described embodiment, the small diameter portion 60 having the inward flange 58 at the tip is provided on one end side of the outer tubular member 12, but it is not always necessary. For example, the inward flange 58 is provided. Alternatively, the outer cylinder member 12 may be provided with the inward flange 58 at one end without being narrowed like the small diameter portion 60 at one end side thereof. .. In short, the effect of the present invention can be obtained if the inner diameter of the end of the outer tubular portion opposite to the side where the metal member is crimped is smaller than the other portion of the outer tubular portion. ..

Further, in the above embodiment, the backup ring 66 is press-fitted to the inner peripheral surface of the small diameter portion 60 of the outer tubular member 12, but the backup ring 66 may be integrally formed with the outer tubular member 12. However, it may not be provided.

Further, in the above-described embodiment, the partition member 18 has the first cylindrical protruding portion 14 and the second cylindrical protruding portion 16, but is a plate-like member having no such cylindrical protruding portion. May be.

In addition, it goes without saying that the present invention can be implemented in various modified modes without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a pressure vessel for an air suspension of the present invention.

FIG. 2 is a view showing another example of the pressure vessel for an air suspension of the present invention, which is a view corresponding to the main part of FIG.

FIG. 3 is a view showing still another example of the pressure vessel for an air suspension of the present invention and is a view corresponding to the main part of FIG. 1.

FIG. 4 is a view showing still another example of the pressure vessel for air suspension of the present invention, corresponding to the main part of FIG. 1.

[Explanation of symbols]

 10 Air Suspension Pressure Vessel 12 Resin Outer Cylinder Member 18,72 Resin Partition Member 20,68 Inner Cylinder Part 22 Bottom Wall Part 24 Metal Member 26 Stepped Surface 28,78 Ring Member (Pressing Part) 32 O Ring (Seal member) 40 Main chamber 42 Subchamber 60 Small diameter part 70 Stepped surface (pressing part)

Claims (1)

[Scope of utility model registration request] 1. An outer cylinder made of resin, a partition wall made of resin that divides the inside of the outer cylinder at an axial center portion thereof, and an inner side of the outer cylinder provided at one end side of the partition. And an annular and plate-shaped inner cylinder part that is brought into air-tight contact with, and is integrally provided on the other end side of the inner cylinder part at the inner peripheral edge part and on the one end side of the outer cylinder part at the outer peripheral edge part. A metal member having a bottom wall portion which is airtightly crimped to
An airtight main chamber is formed on the side of the partition wall opposite to the bottom wall side, and an annular airtight subchamber is formed on the bottom wall side of the partition wall while the other outer cylinder part is formed. A pressure vessel for an air suspension, of which the inner diameter on the end side is smaller than that of the other portion of the outer cylinder portion, the partition wall member being made of resin, and a step for receiving the resin partition member. A resin outer cylinder member having an attached surface on the inner peripheral surface and forming the outer cylinder portion, and the resin provided on the inner cylinder portion of the metal member and receiving the resin partition wall member on the stepped surface. A pressing portion for pinching the resin partition member between the stepped surface and the outer peripheral edge of the bottom wall of the metal member at one end of the outer cylindrical member, and the resin partition member And a seal member that hermetically seals between the resin outer cylinder member. Pressure vessel for air suspension.