JPH0724662Y2 - Anti-vibration joint outer cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an outer cylinder of a vibration-proof joint, and more particularly to a structure in which a member press-fitted inside the outer outer cylinder is prevented from coming out.

[Conventional technology]

As a means for solving the vibrations and noises of an automobile in which a drive system is involved, conventionally, vibration-proof joints as shown in FIGS. 9 and 10 are known. Outer cylinder 1 of this anti-vibration joint
Is a vibration-proof material 4 such as rubber between the inner outer cylinder 2 and the outer outer cylinder 3.
It has a triple-layer structure with a vibration-proof rubber to reduce the vibration of the drive system.

The inner outer cylinder 2 has axial guide grooves 5 formed at three equally divided positions on the entire circumference, which project outward, and partition walls 6 projecting inward are formed between the respective guide grooves 5. Consists of the outer cylinder 1
Is formed by vulcanizing and adhering the vibration isolator 4 to the outer peripheral surface of the inner outer cylinder 2 along its shape and press-fitting and fixing the vibration isolator 4 into the inner diameter portion 3a of the outer outer cylinder 3.

[Problems to be solved by the device]

In the outer cylinder 1 having the above structure, since the vibration isolator 4 and the outer outer cylinder 3 are coupled by the press force using the compressive strain of the vibration isolator 4, the vibration isolator 4 and the vibration isolator 4 to be bonded and fixed to each other. Inner tube 2
It becomes much smaller for the binding force between. Therefore, when the outer outer cylinder 3 is deformed into a taper shape such that the opening end 7 expands due to the pressure input of the vibration isolator 4 or the load torque applied to the outer cylinder 1, the outer outer cylinder 3 and the vibration isolator 4 and the inner side are deformed. The outer cylinder 2 sometimes slipped out.

Further, when the vibration isolator 4 deteriorates due to repeated load or changes with time, the compression rate for press fitting decreases, so the coupling force with the outer outer cylinder 3 becomes weaker, and the inner member is more likely to slip out of the outer outer cylinder 3. become.

As described above, when the inner outer cylinder 2 is axially pulled out together with the vibration isolator 4, the boot mounting groove 8 provided in the inner outer cylinder 2 is displaced in the axial direction. There has been a problem that expansion and contraction cause abnormal deformation, and that deformation easily causes damage to the boot.

This invention solves the above-mentioned drawbacks of the conventional structure, eliminates the slip-out of the inner outer cylinder press-fitted into the outer outer cylinder, and can reliably prevent the deformation of the boot due to the displacement of the boot mounting position. Is intended to provide.

[Means for Solving the Problems]

In order to solve the above problems, the first means of the present invention is
One end of a ring-shaped retaining metal fitting is fixed to the opening end of the outer outer cylinder, and the other end of the retaining metal fitting is bent in the inner diameter direction along the opening end face of the outer outer cylinder, and The tip is extended to the inside of the boot mounting groove provided in the inner outer cylinder, and this bent portion forms one end of the boot mounting groove.

A second means is to fix a tubular retainer fitting to the open end of the outer outer cylinder from the open end of the outer outer cylinder to the open end of the inner outer cylinder. A circular boot mounting part is integrally formed, and a part of the retaining metal fitting is formed so as to interfere with the opening end of the inner outer cylinder in the axial direction. A sealing material that seals the fixed part in a liquid-tight manner is incorporated.

[Action]

According to the first means, the retaining metal fits inside the boot mounting groove to prevent the inner outer cylinder from coming off. Further, since the retaining metal itself forms a part of the boot mounting groove, the mounting position of the boot can be always maintained at a fixed position and deformation of the boot can be prevented.

On the other hand, in the second means, by fixing the boot to the boot mounting portion provided on the retaining metal fitting, displacement of the boot mounting position is eliminated, and the boot mounting portion is formed in a simple circular shape. You can

In addition, the retaining metal covers the open ends of the outer and inner outer cylinders, and the sealing material incorporated in the fixed parts of the outer retaining metal and the outer cylinder prevents water and other substances from entering the retaining metal. Therefore, it is possible to prevent water or the like from entering the inside of the outer cylinder and improve the sealing performance of the outer cylinder.

〔Example〕

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

FIG. 1 and FIG. 2 show the first embodiment, and the outer cylinder 1 has a triple structure in which an inner outer cylinder 2 having a vibration-proof material 4 bonded inside the outer outer cylinder 3 is press-fitted as in the conventional case. Made of The tip of the inner outer cylinder 2 projects from the end of the vibration isolator 4 and the open end 7 of the outer outer cylinder 3, and a boot mounting groove 8 is formed on the outer periphery of the projecting portion 2a.

The inner surface of the outer outer cylinder 3 is formed in a shape conforming to the shape of the outer peripheral surface of the vibration isolator 4, and the outer peripheral surface is formed of the inner cylindrical surface
At the open end 7, a retaining metal fitting 10 formed by annularly forming a thin steel plate is attached.

The retaining metal fitting 10 is such that the large diameter portion of the rear end is fitted into the open end 7 of the outer outer cylinder 3, and the end portion of the large diameter portion is caulked around the groove 12 provided on the outer peripheral surface of the outer outer cylinder 3 all around. Is fixed in the axial pull-out direction. Further, the tip of the retaining metal fitting 10 is attached to the outer cylinder 3
A bent portion 11 is formed by bending inward along the opening end face of the, and the tip of the bent portion 11 enters into the inside of the boot mounting groove 8 of the inner outer cylinder 2, and the boot mounting groove is formed on the inner surface of the bending portion 11. An abutting portion 13 that abuts on the end face of No. 8 is formed.

The tip portion of the bent portion 11 forms one groove wall 8b facing the locking wall 8a in the boot mounting groove 8 and serves as a positioning surface when mounting the boot.

Further, as shown in FIG. 2, each contact portion 13 of the bent portion 11 is
Between the spaces, there is formed a relief portion 14 through which the locking wall 8a of the boot attachment groove 8 formed at the tip of the inner outer cylinder 2 is inserted, and the retaining metal fitting 10 is first attached to the relief portion 14a. Inner tube 2
Align the position of the locking wall 8a of the
The inner side of the boot, and then the retaining metal fitting is rotated 60 ° as shown in FIG. Groove 12 of outer cylinder 3
And tighten.

When the retaining metal fitting 10 is fixed as described above, the abutting portion 13 of the bent portion 11 interferes with the boot mounting groove 8 and stops the inner outer cylinder 2 from moving in the axial direction. Choreography 4
Is prevented from slipping out.

Further, since the bent portion 11 of the retaining metal fitting 10 enters the boot mounting groove 8 and forms one end of the boot mounting groove 8, the boot mounting position can be always maintained at a fixed position. It is possible to eliminate the deforming deformation and damage of the boot.

In addition, as shown in FIGS. 3 (a) and (b) or FIGS. 4 (a) and (b), the retaining metal fitting 10 is fixed to the outer cylinder 3 on the outer peripheral surface of the metal fitting 10 at predetermined intervals. Projecting pieces 15 and 16 protruding to
It is also possible to form a plurality of parts and push the metal fitting 10 into the opening of the outer outer cylinder 3, and then to engage the projection pieces 15 and 16 with the groove 12 to prevent the metal piece 10 from coming off.

5 and 6 show a second embodiment.

In this example, the retaining metal fitting 30 is attached to the opening end 7 of the outer outer cylinder 3.
To the open end 2a of the inner outer cylinder 2 is formed in a cylindrical shape, and its rear end is caulked in the groove 12 of the outer outer cylinder 3.

In addition, the tip of the retaining metal fitting 30 is connected to the opening end 7 of the outer outer cylinder 3.
And the tip of the bent portion 31 is further extended in the axial direction.
I am trying.

The boot mounting portion 32 covers the outer periphery of the inner outer cylinder 2, and has a tip end portion that abuts the open end 2a of the inner outer cylinder 2.
Forming 33.

A protrusion 34 is formed on the outer periphery of the tip of the boot attaching portion 32, and a boot attaching groove 8 into which the end portion of the boot fits is formed between the protrusion 34 and the bent portion 31. The boot is fitted and fixed to the boot mounting groove 8 by using a boot band.

A seal ring 35 is attached to the outer peripheral surface of the outer outer cylinder 3 so as to prevent water and dust from entering from the crimped end of the retaining metal fitting 30.

In the above-mentioned structure, the movement of the inner outer cylinder 2 coming out is
It can be stopped at the contact portion 33 of the retaining metal fitting 30. Further, in the conventional structure, the boot mounting portion, which had to be formed by changing the wall thickness so as to follow the outer diameter shape of the inner outer cylinder 2, can be formed into a simple circular shape. There is an advantage that the manufacturing cost of the boot can be reduced because it is not necessary to use a specially shaped mold for molding.

Further, in the state where the boot is attached as described above, the retaining metal fitting 30 covers the joint ends of the outer outer cylinder 3, the vibration isolator 4, and the inner outer cylinder 2, and the boot and the seal ring 35 prevent the retaining metal fitting 30. Since water and the like are prevented from entering the inside, it is possible to reliably prevent water and the like from entering the inside of the outer cylinder 1, and to improve the sealing performance of the outer cylinder.

7 and 8 show a third embodiment, in which the lengths of the outer outer cylinder 3 and the vibration isolator 4 are extended, and the open end 2a of the inner outer cylinder 2 and the outer outer cylinder are extended. The open ends 7 of 3 are aligned.

Further, the retaining metal fitting 40 includes a fitting portion 42 fitted to the outer diameter of the outer outer cylinder 3 and an end surface of the inner outer cylinder 2 that is bent inward from the fitting portion 42 along the end surface of the outer outer cylinder 3. Is formed, and a boot mounting portion 43 having a circular cross section in which the boot mounting groove 8 is formed is formed in front of the open side of the bending portion 41.

In the above structure, since the boot mounting groove 8 is circular, a low cost boot can be used as in the third embodiment,
Moreover, since the outer cylinder 3 and the vibration isolator 4 are extended to increase the overall length of the vibration isolator 4, the strength and durability of the vibration isolator 4 are improved, and the vibration proof is achieved without increasing the outer diameter of the joint. There is an advantage that the effect can be improved.

[Effect of device]

As described above, according to this invention, the retaining metal is attached to the open end of the outer outer cylinder to mechanically prevent the inner outer cylinder from coming out. It is possible to completely prevent slipping out. Therefore, stable joint performance can always be obtained regardless of the deterioration of the vibration isolator and the change in the load applied to the joint.

Further, according to the second means of the present invention, since the tip of the retaining metal fitting is inserted into the boot mounting groove to form the end portion of the groove, the mounting position of the boot can be always maintained at a fixed position. It is possible to reliably prevent abnormal deformation and damage of the.

Further, in the third means, since the circular boot mounting portion is formed at the tip of the retaining metal fitting, the shape of the coupling portion of the boot can be formed in a circular shape having a uniform thickness, and there is an advantage that a low-cost boot can be used. is there.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view of the first embodiment, FIG. 2 is a front view thereof, and FIG. 3 (a) is a partially longitudinal side view showing another example of a retaining metal fitting, and FIG. 3 (b). ) Is a sectional view taken along the line II, FIG. 4 (a) is a partially longitudinal side view showing another example of the retaining metal fitting, and FIG. 4 (b) is a sectional view taken along the line II-II. FIG. 5 is a partial vertical side view of the second embodiment, FIG. 6 is a front view thereof, FIG. 7 is a partial vertical side view of the third embodiment, FIG. 8 is a front view thereof, and FIG. Longitudinal front view of structure, No.
FIG. 10 is a side view of a part of the vertical section. 1 ... Outer cylinder, 2 ... Inner outer cylinder, 3 ... Outer outer cylinder, 4 ...
Anti-vibration material, 7 ... Open end, 8 ... Boot mounting groove, 10, 3
0,40 …… Prevention metal fittings, 11,31,41 …… Bends, 13,3
3 …… Abutment part, 32, 43 …… Boot mounting part.

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. An outer cylinder of a vibration-proof joint comprising a vibration-damping material adhered to the outer circumference of an inner outer cylinder, and the vibration-proof material being press-fitted inside the outer outer cylinder. One end of the ring-shaped retaining metal was fixed, the other end of the retaining metal was bent in the inner diameter direction along the opening end face of the outer outer cylinder, and the tip of the bent portion was provided on the inner outer cylinder. An outer cylinder of an anti-vibration joint, which is extended to the inside of the boot mounting groove, and the bent portion forms one end of the boot mounting groove. 2. An outer cylinder of a vibration-proof joint, comprising a vibration-damping material adhered to the outer circumference of an inner outer cylinder, and the vibration-damping material being press-fitted inside the outer outer cylinder. A tubular retainer fitting covering the open end of the outer outer cylinder to the open end of the inner outer cylinder is fixed, and a boot attachment part with a circular cross section is integrally formed with this retainer, and the retainer Partly formed so as to interfere axially with the open end of the inner outer cylinder,
An outer cylinder of a vibration-proof joint, characterized in that a sealing material for liquid-tightly sealing the fixed portion is incorporated in the fixed portion of the outer outer cylinder and the retaining metal fitting.