JPH04129971U - Seal device for boots - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the assembly work and to ensure the positioning of the cylindrical portion 3 and the drive shaft 6. [Structure] A plurality of protrusions 7, 7 are formed on the outer peripheral surface of the intermediate portion of the drive shaft 6. The cylindrical portion 3 formed at the end of the boot 1 can be fitted onto the protrusions 7, 7. A protrusion 9 is formed at a predetermined depth on the inner peripheral surface of the cylindrical portion 3 . When fitting the cylindrical portion 3 onto the drive shaft 6, the cylindrical portion 3 and the drive shaft 6 are positioned by the abutment between the protrusion 9 and the protrusion 7 at the end.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The boot sealing device according to this invention can be used, for example, at a constant velocity for transmitting the driving force of an automobile. A boot and shaft are installed around the joint for the purpose of dustproofing and waterproofing. This prevents dust and water from entering the boot from between the boots.

0002

[Conventional technology]

A drive shaft and wheels that are rotationally driven by the engine via a differential gear. A universal joint such as a constant velocity joint is installed between the axle and the axle that rotates together with the vehicle body. Regardless of the displacement (vertical movement) of the wheel relative to the wheel or the steering angle of the wheel, the wheel is It is designed to be driven to rotate at a speed proportional to the rotation speed.

0003 Universal joints such as the above-mentioned constant velocity joints used in such places are subject to long-term In order to ensure stable operation, the area around the universal joint is made of composite material as shown in Figure 3. It is covered with a boot 1 made of resin, rubber, or the like.

0004 The boot 1 has a bellows-shaped intermediate portion, and has cylindrical portions 2 and 3 formed at both ends thereof. One (left side in FIG. 3) of the cylindrical part 2 is connected to the housing 5 of the constant velocity joint 4. The other cylindrical part 3 (on the right side of the figure) is fitted onto the outer peripheral surface of the drive shaft 6, respectively. do. On the outer circumferential surface of the housing 5 and the outer circumferential surface of the drive shaft 6, at least each cylindrical portion The portion where 2 and 3 are fitted is a cylindrical surface.

[0005] Along with this, each of the cylindrical surfaces has a plurality of protrusions 7, as shown in detail in FIG. 7 are formed over the entire circumference. Each of the cylindrical parts 2 and 3 has a front A band-shaped fastener is fitted onto the plurality of protrusions 7, 7 and further fitted onto each of the cylindrical parts 2, 3. Tighten the fittings 8 and press the inner circumferential surfaces of each cylindrical portion 2, 3 onto the plurality of protrusions 7, 7. wear.

[0006] As a result, the inner circumferential surface of each of the cylindrical portions 2 and 3 and the plurality of protrusions 7 and 7 are The two ends of the boot 1 and the housing are brought into strong contact at multiple locations in the axial direction. 5 and the drive shaft 6 is maintained.

[0007]

[Problem that the idea aims to solve]

However, in the case of the conventional structure, the inner circumferential surface of the cylindrical portion 3 (2) is , each cylindrical part 3 (2 ) in a predetermined position on the outer circumferential surface of the drive shaft 6 (housing 5). It was.

[0008] Japanese Utility Model Publication No. 2-15088 discloses a drive for externally fixing the cylindrical portion of the end of the boot. A concave groove is formed on the outer peripheral surface of the shaft, etc., along the entire circumference, and a groove is formed in the open end of the cylindrical portion. By forming a protrusion on the periphery and engaging the protrusion with the groove, the drive shaft, etc. A structure for positioning the cylindrical portion relative to the cylindrical portion is described.

[0009] However, in the case of such a conventionally known positioning structure, the labyrinth effect In order to achieve higher sealing performance, if multiple grooves are formed on the outer circumferential surface of the drive shaft, etc., the above-mentioned Until the cylindrical portion is moved to a predetermined position on the outer circumferential surface of the drive shaft, etc., the protrusions are You have to overcome multiple ditches.

0010 For this reason, if the depth of engagement between the concave groove and the protrusion is large (the tightness is large), the cylindrical The work of fitting the part onto a predetermined position on the outer peripheral surface of the drive shaft or the like becomes troublesome. On the other hand, external fitting work In order to facilitate It becomes difficult to obtain a reliable click feeling when engaging with the row, and positioning tends to become uncertain. .

[0011] The boot sealing device of the present invention was devised in view of the above-mentioned circumstances. Ru.

0012

[Means to solve the problem]

The boot sealing device of the present invention has a cylindrical portion formed at the end of the boot made of elastic material. a member having a cylindrical outer peripheral surface and surrounded by the boot; A plurality of protrusions are formed on the outer circumferential surface, each extending around the entire circumference, and a plurality of protrusions are formed on the outer peripheral surface, and a plurality of protrusions are formed on the outer peripheral surface, and with the cylindrical portion being fitted onto the plurality of protrusions, Tighten the tightening fitting fitted onto the cylindrical part, and tighten the inner circumferential surface of the cylindrical part to the part. Press firmly against the outer circumferential surface of the material.

[0013] Furthermore, in the boot sealing device of the present invention, the inner circumferential surface of the cylindrical portion At a predetermined distance away from the opening edge of the cylindrical part, there is a groove that is sufficiently smaller than the outer diameter of the protrusion. A protrusion having a small inner diameter is provided, and the protrusion is located at an end between the protrusion and the plurality of protrusions. The fitting position between the member and the cylindrical portion is regulated to an appropriate value by collision with the protrusion. It is characterized by

[0014]

[Effect]

In the case of the boot sealing device of the present invention configured as described above, the protrusion and the plurality of protrusions are The fitting position between the member and the cylindrical part is adjusted to an appropriate value by colliding with the protrusion located at the end of the It is possible to ensure that regulations are regulated.

[0015] The cylindrical part is fitted onto the member, and the protrusion and the protrusion abut each other, so that the member and the cylindrical part are connected to each other. Until the fitting depth reaches an appropriate value, the outer circumferential surface of the member and the inner circumferential surface of the cylindrical portion are Since there is no strong engagement, fitting the cylindrical part onto the member is easy with light force. can be done. In addition, since the engagement depth between the protrusion and the protrusion can be made sufficiently large, the position can be ensured. I can make a decision.

[0016]

【Example】

1-2 show an embodiment of the invention. Made of elastic synthetic resin, the middle part A cylindrical portion is attached to the end of the boot 1 (see FIG. 3 above for the overall shape) which is formed into a bellows shape. 3 is formed. The drive shaft 6, which is a member surrounded by the boot 1, has a circular shape. It has a cylindrical outer peripheral surface. Then, on this cylindrical outer circumferential surface, a plurality of protrusions are provided around the entire circumference. It forms Articles 7 and 7.

[0017] Further, on the inner circumferential surface of the cylindrical portion 3, a predetermined distance L from the opening edge 3a of the cylindrical portion 3 is provided. A step-like protrusion 9 is formed over the entire circumference at a portion separated by the same amount. This protrusion 9 The inner diameter R is made sufficiently smaller than the outer diameter D of the protrusions 7, 7, so that the protrusions 9 and the Among the plurality of protrusions 7, 7, the protrusion 7 located at the end (the left end in FIGS. 1 and 2) collides with the protrusion 7. Currently in existence.

[0018] Further, the predetermined distance L is such that when the protrusion 9 and the protrusion 7 collide, the drive shaft 6 and the cylindrical portion 3 is determined so that the fitting position between the cylindrical portion 6 and the cylindrical portion 3 is regulated to an appropriate value. That is, synthetic trees The fat boots 1 are used with their bellows elastically compressed, as shown in Figure 3. Therefore, if the formation position of the protrusion 9 is determined appropriately, the state in which the boot 1 is installed can be adjusted. In this case, the protrusion 9 is elastically pressed against the protrusion 7, and the protrusion 9 is pressed against the drive shaft 6. The fitting position of the cylindrical portion 3 can be properly regulated.

[0019] Further, a tightening fitting 8 is fitted onto the cylindrical portion 3, and the plurality of protrusions 7, 7 inserted into the inside of the cylindrical portion 3, tighten this tightening fitting 8, and The inner circumferential surface of the cylindrical portion 3 is strongly pressed against the outer circumferential surface of the drive shaft 6.

[0020] Tighten the clamping fitting 8 to force the inner circumferential surface of the cylindrical portion 3 onto the outer circumferential surface of the drive shaft 6. In the pressed state, the inner circumferential portion of the cylindrical portion 3 touches the drive shaft as shown in FIG. It is elastically (or plastically) deformed in accordance with the shape of the outer peripheral surface of the cylindrical portion 3, and is driven by the inner peripheral surface of the cylindrical portion 3. The space between the shaft 6 and the outer circumferential surface is sealed.

[0021] In the case of the boot sealing device of the present invention configured as described above, the bellows part of the boot 1 By utilizing the repulsive force caused by compressing the The stepped protrusion 9 collides with the protrusion 7 located at the end of the plurality of protrusions 7, 7. Therefore, it is possible to reliably regulate the fitting position between the drive shaft 6 and the cylindrical portion 3 to an appropriate value. .

[0022] The cylindrical portion 3 is fitted onto the protrusions 7, 7 forming portion of the drive shaft 6, and the protrusions 9 and 7 are formed. The above-mentioned There is no strong engagement between the outer peripheral surface of the drive shaft 6 and the inner peripheral surface of the cylindrical portion 3. For this reason, The operation of fitting the cylindrical portion 3 onto the drive shaft 6 can be easily performed with light force. Also, sudden The portion 9 does not need to go over any of the protrusions 7, so the depth of engagement between the protrusions 9 and the protrusions 7 is reduced. Since the height h can be made sufficiently large, reliable positioning can be achieved.

[0023] In the case of the illustrated embodiment, the sealing device between the drive shaft 6 and the cylindrical portion 3 will be explained. As explained above, the seal between the housing 5 of the constant velocity joint 4 and the cylindrical part 2 (Fig. 3) The device can also be configured in the same way.

[0024]

[Effect of the idea]

The boot sealing device of the present invention is configured and operates as described above, so it is easy to assemble. Easy to set up and secure positioning.

[Brief explanation of drawings]

FIG. 1 is a sectional view corresponding to section A in FIG. 3, showing a state in which a cylindrical portion and a drive shaft are fitted together, showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a state after being tightened with a tightening fitting.

FIG. 3 is a sectional view showing a state in which a boot to which the sealing device of the present invention is applied is used.

FIG. 4 is an enlarged sectional view of section A in FIG. 3, showing an example of a conventional sealing device.

[Explanation of symbols]

1 boots 2 Cylindrical part 3 Cylindrical part 3a Opening edge 4 Constant velocity joint 5 Housing 6 Drive shaft 7 Projections 8 Tightening metal fittings 9 Protrusion

Claims (1)

[Scope of utility model registration request] 1. A cylindrical part formed at an end of a boot made of an elastic material, a member having a cylindrical outer circumferential surface and covered by the boot, and a member having a cylindrical outer circumference formed on the entire periphery of the boot. It consists of a plurality of protrusions formed over the entire length and a tightening fitting that can be fitted onto the cylindrical part, and the cylindrical part is fitted onto the plurality of protrusions while the cylindrical part is fitted onto the cylindrical part. In a boot sealing device that tightens a tightening fitting and strongly presses the inner circumferential surface of the cylindrical portion against the outer circumferential surface of the member, the inner circumferential surface of the cylindrical portion has a predetermined distance from the opening edge of the cylindrical portion. A protrusion having an inner diameter sufficiently smaller than the outer diameter of the protrusion is provided in a part separated by a distance, and this protrusion collides with a protrusion located at an end of the plurality of protrusions. A sealing device for a boot, characterized in that a fitting position between the member and the cylindrical portion is regulated to an appropriate value.