JP3060183B2 - Sliding rubber bush - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber bush used for an automobile suspension or the like.
The present invention relates to a sliding rubber bush that is rotatable with respect to a support shaft and slidable in the axial direction.

[0002]

2. Description of the Related Art In a vehicle suspension, a rubber bush is used for a link or an arm connecting portion between a wheel and a vehicle body in order to absorb vibrations transmitted from the wheel to the vehicle body. Is often done. Generally, the rubber bush is constituted by an inner cylinder and an outer cylinder arranged concentrically at an interval, and a rubber-like elastic body mounted between the inner and outer cylinders. The rubber-like elastic body is vulcanized and bonded to the inner cylinder and the outer cylinder, respectively. Then, the inner cylinder is fitted and supported on a support shaft attached to the vehicle body or the wheel side, and the outer cylinder is fixed to the other side. When such a rubber bush is used for a suspension,
Normally, the inner cylinder is fixed to the support shaft. By doing so, when the wheel is displaced with respect to the vehicle body, the inner cylinder and the outer cylinder of the rubber bush are relatively displaced in the radial direction, the circumferential direction, or the axial direction, and the rubber-like elastic body is elastically moved with the relative displacement. Since it is deformed, its elasticity allows vibrations in various directions to be absorbed.

[0003] By the way, as a rear suspension of an automobile, there is known a rear suspension in which the attitude of a wheel at the time of bump rebound is controlled by one trailing arm and three lateral links. In the rear suspension, a wheel support portion is provided at a rear end side of a trailing arm which is arranged in the front and rear direction of the vehicle body and a front end side of which is vertically swingably connected to the vehicle body, and the wheel support portion allows the wheels to rotate freely. Supported. Then, both ends of the three lateral links arranged in the lateral direction of the vehicle body are swingably connected to the trailing arm and the vehicle body, respectively. Further, a suspension spring is provided between the trailing end of the trailing arm and the vehicle body to absorb the vertical movement of the wheels. According to such a rear suspension, the position of the wheel in the front-rear direction is regulated by the trailing arm, and at the time of bump rebound, the trailing arm swings up and down around the vehicle body side connection portion at the front end side. This allows the wheel to move up and down. The camber and toe angle of the wheel at that time are determined by the three lateral links. Therefore, it is easy to set the attitude of the wheels at the time of bump rebound, and it is possible to further improve the riding comfort and maneuverability of the automobile.

Further, in the case of such a suspension using three lateral links, if the lateral links are arranged apart from each other, the toe rigidity can be increased, and the attitude of the wheels by the side force can be improved. Changes can be prevented. Further, by arranging the front lateral link near the connecting portion of the trailing arm on the vehicle body side, the lateral link can be shortened, and the entire suspension can be reduced in weight and size. From such a viewpoint, a rear suspension in which the front end side of the trailing arm extends forward from the connecting portion on the vehicle body side, and one of three lateral links is connected to the extending portion is proposed. (Japanese Unexamined Patent Publication No. Sho 62)
-6806).

[0005] In such a suspension, the front-rear impact force applied to the wheels is transmitted to the vehicle body via a trailing arm. Therefore, in order to improve the compliance by absorbing the impact force, a rubber bush is generally used for the vehicle body side connecting portion of the trailing arm. In this case, when one of the three lateral links is connected to the front end side extension of the trailing arm as described above, the lateral link strongly influences the posture of the trailing arm as viewed in a plan view. Therefore, when the trailing arm swings up and down, a large displacement of the trailing arm in the vehicle body left-right direction may occur at the vehicle body side connecting portion. Therefore, when a rubber bushing in which an inner cylinder and an outer cylinder are fixed to a vehicle body and a trailing arm, respectively, is used in the vehicle body-side connecting portion as in the related art, a large axial load is applied to the rubber-like elastic body between the inner cylinder and the outer cylinder. Is added, which causes a problem that the rubber-like elastic body is easily deteriorated. In addition, since the elasticity of the rubber-like elastic body becomes a resistance to the displacement of the trailing arm, the control of the attitude of the wheels by the lateral link is not performed smoothly, and the riding comfort against bump rebound is reduced.

[0006] In the case of a suspension using such a rubber bush in the vehicle-body-side connection portion of the trailing arm, when a vertical force acts on the wheels and the trailing arm swings vertically, Since the inner and outer cylinders of the rubber bush rotate relatively, the rubber-like elastic body between the inner and outer cylinders is elastically deformed in the circumferential direction. However, since the vertical force applied to the wheel is elastically supported by the suspension spring, it is not necessary for the rubber bush to have a buffering property against the vertical swing of the trailing arm. If the rubber-like elastic body is elastically deformed even when the trailing arm swings up and down in such a manner, the rubber-like elastic body is always subjected to a shearing force, and the rubber-like elastic body is easily deteriorated accordingly. . Therefore, the durability of the rubber bush decreases.

Therefore, in the case of the above-described suspension, the rubber bush used for the vehicle-body-side connecting portion of the trailing arm may be rotatable with respect to the support shaft and slidable in the axial direction. desired. Such a sliding rubber bush is disclosed in Japanese Utility Model Laid-Open No. 63-188348. In the rubber bush, the inner cylinder is a sliding sleeve made of a material having a low coefficient of friction, and the sliding sleeve is fitted and supported on a support shaft. If such a slide type rubber bush is used, the displacement of the trailing arm in the left-right direction of the vehicle body is allowed without any resistance, so that the attitude control of the wheels by the lateral link is smoothly performed. Also, even when the trailing arm swings up and down, an unnecessary load may be applied to the rubber-like elastic body between the inner cylinder and the outer cylinder by rotating the inner cylinder of the rubber bush with respect to the support shaft. Since it disappears, the durability of the rubber bush is improved.

When the inner cylinder of the rubber bush is made slidable with respect to the support shaft, water, dust and the like enter the sliding portion between the inner cylinder and the support shaft. It is necessary to prevent the sliding resistance from increasing. Therefore, in the above-mentioned publication, a dust boot having one end coupled to the rubber bush and the other end closely attached to the outer peripheral surface of the support shaft is provided so that the sliding portion is sealed from the outside. ing. The dust boot is formed integrally with the rubber-like elastic body of the rubber bush or is fixed to the outer cylinder.

[0009]

However, in such a rubber bush in which the dust boot is integrated, the sliding portion between the inner cylinder and the support shaft is exposed because the dust boot cannot be removed. Becomes difficult. Also, with one end of the dust boot attached to the outer cylinder,
It is inevitable that the entire rubber bush will become large. On the other hand, in the case of a sliding rubber bush used for a suspension of an automobile, it is desired that the sliding portion is easily exposed for maintenance and inspection of the sliding portion. It is also desired that the rubber bush be formed as compact as possible. Therefore, in such a slide-type rubber bush, it is desired that one end of the dust boot be detachably attached to the inner cylinder of the rubber bush.

In order to detachably attach one end of the dust boot to the inner cylinder of the rubber bush, a boot mounting portion is formed at both ends in the axial direction of the outer peripheral surface of the inner cylinder, and the boot mounting portion is provided at the boot mounting portion. May be fixed by tightening one end with a circlip or the like. However, when such a slide type rubber bush is used for the trailing arm of the suspension as described above, the rubber bush is relatively displaced in both the rotation direction and the axial direction with respect to the support shaft. In dust boots,
Torsional and tensile forces will act. Therefore,
Simply by stopping one end of the dust boot with a circlip or the like, deformation of the edge of the dust boot cannot be avoided. Further, the rubber-like elastic body is also deformed by the force applied to the rubber bush. For this reason, even if the dust boot is brought into close contact with the rubber-like elastic body of the rubber bush, there is a gap therebetween.

When a gap is formed between the dust boot and the rubber-like elastic body, water or the like intrudes from the gap and adheres to the boot mounting portion of the inner cylinder. In addition, since the inner cylinder of such a rubber bush is generally formed of an iron-based material, if water or the like adheres, rust is generated at the boot mounting portion. In order to prevent the occurrence of such rust, it is conceivable to perform rust prevention treatment on the inner cylinder, but if the entire inner cylinder is subjected to rust prevention treatment, a rubber-like elastic body is bonded to the inner cylinder. You will not be able to do it. The rust prevention treatment may be applied only to the boot mounting portion of the inner cylinder. However, if such an attempt is made, the rust prevention treatment is troublesome and the productivity is reduced. In particular, after the dust boot is assembled, the boot mounting portion is covered with the dust boot, so that the boot mounting portion of the inner cylinder cannot be subjected to rust prevention treatment.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a sliding rubber bush as described above, in which a dust boot can be easily mounted, and the dust boot and rubber can be mounted. The purpose is to ensure a seal between the bush and the bush.

[0013]

In order to achieve this object, according to the present invention, a boot mounting portion to which one end of a dust boot is mounted is formed on the outer peripheral surfaces of both ends in the axial direction of an inner cylinder of a rubber bush. Both sides in the axial direction of the inner peripheral part of the rubber-like elastic body of the rubber bush are extended to the boot mounting part,
The extended portion of the rubber-like elastic body is sandwiched between the end of the dust boot and the boot mounting portion of the inner cylinder.

[0014]

According to this structure, if one end of the dust boot is fitted into the boot mounting portion of the inner cylinder and the outer periphery thereof is fastened with a circlip or the like, the end of the dust boot and the inner cylinder can be connected to each other. Since the extension of the rubber-like elastic body is sandwiched between them and the space between them will be sealed,
Water and dust are prevented from entering the inside of the dust boot, and rust is prevented from being generated due to the water or the like adhering to the boot mounting portion of the inner cylinder.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a sliding type rubber bush according to the present invention. FIG. 1 is a longitudinal sectional view thereof, and FIGS. 2 and 3 show an enlarged state when a dust boot is assembled to the rubber bush. FIG. 5 and 6 are a plan view and a side view showing a rear suspension of an automobile using the rubber bush.

As is clear from FIGS. 5 and 6, the rear suspension 1 includes a trailing arm 2 arranged in the front-rear direction of the vehicle (the left side in the figure is the front of the vehicle).
At the rear end of the trailing arm 2, a rear axle 3
The rear wheel 4 is rotatably supported by the axle 3. That is, the rear end of the trailing arm 2 is a wheel support. On the front end side of the trailing arm 2, a sliding rubber bush 5 as described later is attached. The rubber bush 5 is arranged so that its axis is in the left-right direction of the vehicle body, and is mounted on a left-right support shaft 7 fixed to the vehicle body frame 6. Thus, the trailing arm 2 has its front end connected to the vehicle body via the rubber bush 5 and is supported so as to be able to swing vertically. The vertical swing causes the wheels 4 to move up and down.

The front end of the trailing arm 2 extends forward from the mounting portion of the rubber bush 5, that is, the vehicle body side connecting portion 8. One end of a first lateral link 10 arranged substantially in the lateral direction of the vehicle body is swingably connected to a front end of the extension 9 via a rubber bush 11. The other end of the first lateral link 10 is swingably connected to a front vehicle body cross member 13 via a rubber bush 12. When the lateral link 10 is in a neutral state in which no vertical force acts on the wheels 4, the lateral link 10 is inclined slightly upward and backward toward the outside of the vehicle body.

At the rear end of the trailing arm 2, there are provided an arm portion 14 extending slightly upward and slightly obliquely forward, and a projecting portion 15 slightly projecting downward. One end of a relatively short second lateral link 16 arranged in the left-right direction of the vehicle body is swingably connected to an upper end of the arm portion 14 via a rubber bush 17. The other end of the second lateral link 16 is connected to a rubber bush 18.
And is swingably connected to the vehicle body frame 6 via a.
Similarly, the lower protruding portion 15 at the rear end of the trailing arm 2
Has a third lateral link 1 arranged in the lateral direction of the vehicle body.
One end of 9 is swingably connected via a rubber bush 20. The third lateral link 19 is relatively long, and the other end is swingably connected to a rear vehicle body cross member 22 via a rubber bush 21. The second lateral link 16 is substantially horizontal when in the neutral state. On the other hand, the third lateral link 19
Is inclined slightly downward and forward toward the outside of the vehicle body in the neutral state.

Thus, the trailing arm 2
Is three lateral links 1 arranged in the left and right direction of the vehicle
The trailing arm 2 is connected to the vehicle body via 0, 16 and 19, so that the trailing arm 2 is controlled in the left-right direction, that is, the camber and the toe angle of the wheel 4 are controlled. Rubber bushes 11, 1 for connecting the lateral links 10, 16, 19 to the trailing arm 2 side.
7, 20 and rubber bush 12, 1 connected to the vehicle body side
8, 21 are the same as the conventional ones.

A lower end of a damper 23 is rotatably connected to a portion of the third lateral link 19 near the trailing arm 2 via a horizontal shaft. The upper end of the damper 23 is rotatably connected to a wheel house 24 of the vehicle body. A suspension spring 25 is provided between the lower part of the damper 23 and the wheel house 24, so that the wheel 4 is elastically supported in the vertical direction.

As shown in FIG. 1, a rubber bush 5 provided on the vehicle body side connecting portion 8 of the trailing arm 2 is provided.
Is composed of an inner cylinder 26, an outer cylinder 27 concentrically arranged on the outer peripheral side of the inner cylinder 26 at a distance, and a rubber-like elastic body 28 arranged between the inner cylinder 26 and the outer cylinder 27. It is configured. The rubber-like elastic body 28 is a ring-shaped one having a gap 29 on both sides in the diameter direction, and its inner and outer peripheral surfaces are vulcanized and bonded to the inner cylinder 26 and the outer cylinder 27, respectively.
Thereby, the inner and outer cylinders 26 and 27 are connected to each other. The rubber bush 5 is fixed to the trailing arm 2 by press-fitting the outer cylinder 27 into an opening provided in the vehicle body side connecting portion 8 of the trailing arm 2. In this case, as shown in FIG. 6, the rubber-like elastic body 28 is attached to the trailing arm 2 so that the gap 29 of the rubber-like elastic body 28 is located on the front-rear side of the vehicle body. Are easily deformed.

On the inner peripheral surface of the inner cylinder 26 of the rubber bush 5,
A sliding collar 30 made of a material having a small coefficient of friction is mounted. The collar 30 is fitted on the outer periphery of the support shaft 7 fixed to the vehicle body. The support shaft 7 is sufficiently longer than the inner cylinder 26. Thus, the rubber bush 5 is configured such that the inner cylinder 26 can slide in the axial direction and the rotational direction with respect to the support shaft 7. That is, the rubber bush 5 is a slide type rubber bush.

On the outer peripheral surface of the inner cylinder 26 of the rubber bush 5,
Protrusions 31, 31 are formed at positions corresponding to both side surfaces of the rubber-like elastic body 28, respectively. The inner cylinder 26 extends axially outward from the projections 31, 31. Then, between the extended portion, that is, between the outer portions of the inner cylinder 26 than the protrusions 31 and 31 and both end portions of the support shaft 7,
Tubular dust boots 32, 32 made of an airtight and flexible material such as thin rubber or the like are arranged. A mounting ring 33 is attached to one end of the dust boot 32,
The mounting ring 33 is press-fitted to the outer periphery of the end of the inner cylinder 26 and is fixed at a position where it comes into contact with the projection 31. The mounting ring 33 has a channel-shaped cross section with an open outer peripheral side, and is formed of a corrosion-resistant rigid material such as stainless steel. One end of the dust boot 32 is engaged and fixed to the groove of the attachment ring 33 by tightening the circlip 34 from the outer peripheral side so that movement in the axial direction is restricted with respect to the attachment ring 33. It has become. Thus, one end of the dust boot 32 is mounted on the outer portion of the projection 31 adjacent to the rubber-like elastic body 28 of the inner cylinder 26 via the attachment ring 33. That is, the inner cylinder 2
6, both ends in the axial direction of the outer peripheral surface are boot mounting portions 35.

As shown in FIG. 2, the rubber-like elastic body 28 of the rubber bush 5 is integrally formed with an extension 36 extending outward from both sides in the axial direction of the inner periphery thereof. . The extension portion 36 is provided on the outer surface of the protrusion 31 adjacent to the rubber-like elastic body 28, that is, the boot attachment portion 35 of the inner cylinder 26.
Extends to Therefore, when the mounting ring 33 is press-fitted into the inner cylinder 26, the extension 36 thereof is sandwiched between the projection 31 of the inner cylinder 26 and the mounting ring 33 as shown in FIG. It is supposed to be. As shown in FIG. 3, several grooves 37 extending in the circumferential direction are formed on a surface of one end of the dust boot 32 in contact with the attachment ring 33, and the circlip 34 is formed.
When it is tightened, the space between them is sealed. On the other hand, as shown in FIG. 1, a mandrel 38 is buried in the periphery of the opening on the other end side of the dust boot 32. The other end of the dust boot 32 is tightly fixed to the outer peripheral surface of the support shaft 7.

In this manner, a seal is provided between one end of the dust boot 32 and the mounting ring 33 mounted on the end thereof, and a seal is provided between the mounting ring 33 and the rubber-like elastic body 28 of the rubber bush 5. It has become so.
The other end of the dust boot 32 is sealed to the outer peripheral surface of the support shaft 7. That is, both ends of the dust boot 32 are sealed with respect to the rubber bush 5 and the support shaft 7, respectively, and the sliding portion between the inner cylinder 26 and the support shaft 7 is sealed from the outside by the dust boot 32. ing.

Next, the operation of the slide-type rubber bush 5 configured as described above will be described. In an automobile rear suspension 1 using the rubber bush 5,
When a vertical force acts on the wheel 4 and the wheel 4 moves up and down, the trailing arm 2 supporting the wheel 4 at the rear end moves up and down around the vehicle body side connecting portion 8 at the front end. Rocks in the direction. At this time, the vehicle body side connecting portion 8
The rubber bush 5 has an outer cylinder 27 fixed to the trailing arm 2, and an inner cylinder 26 connected to the outer cylinder 27 via a rubber-like elastic body 28. Since the trailing arm 2 is pivotable with respect to the supporting shaft 7, the whole pivots about the support shaft 7. Therefore, no load acts on the rubber-like elastic body 28. The vertical movement of the wheel 4 is buffered by the damper 23 and the suspension spring 25.

When the wheel 4 moves up and down in such a manner, the camber and the toe angle of the wheel 4 are controlled by the three lateral links 10, 16 and 19. That is, when the wheel 4 moves up and down, the trailing arm 2 swings up and down as described above, so that the three lateral links 10, 16, connecting the trailing arm 2 and the vehicle body in the left and right direction. 19 swings up and down around the rubber bushes 12, 18, and 21 which are connecting portions on the vehicle body side. Then, the swinging moves the trailing arm 2 in the left-right direction of the vehicle body. In this case, since the lengths, inclinations, and the like of the lateral links 10, 16, and 19 are different from each other, the amount of displacement of the trailing arm 2 in the left-right direction of the vehicle body is different from the position at which the lateral links 10, 16, and 19 are connected. Will be different.
Accordingly, when the first and third lateral links 10 and 19 swing, the front and rear end portions of the trailing arm 2 to which they are connected change in the vehicle body left-right direction, respectively. Is determined. Also, the second and third lateral links 16, 19
Of the trailing arm 2 changes the position of the upper and lower portions of the trailing arm 2 in the lateral direction of the vehicle body, and the inclination of the vehicle body in the vertical direction is determined. Thus, the three lateral links 10, 1
6 and 19 control the inclination of the trailing arm 2 at the time of bump rebound. Then, the wheels 4 are also inclined accordingly. That is, the camber and the toe angle of the wheel 4 are controlled. Therefore, by appropriately selecting the lengths and inclinations of the three lateral links 10, 16 and 19, or the positions of the connecting portions thereof, the posture of the wheel 4 during bump rebound can be set optimally. Ride comfort and maneuverability can be improved.

As described above, in the rear suspension 1, when the wheels 4 move up and down, the entire trailing arm 2 is displaced in the lateral direction of the vehicle body. In addition, a first control for controlling the position of the front end of the trailing arm 2 in the left-right direction.
Since the lateral link 10 is disposed in the vicinity of the vehicle-body-side connecting portion 8 that supports the trailing arm 2, the vehicle-body-side connecting portion 8 also tends to be displaced in the vehicle left-right direction.
In this case, in the suspension 1, the rubber bush 5 provided on the vehicle body side connecting portion 8 is slidable in the axial direction with respect to the support shaft 7 fixed to the vehicle body, that is, in the lateral direction of the vehicle body. Therefore, the displacement at that time is allowed by the sliding. Therefore, the trailing arm 2 is displaced without elastically deforming the rubber-like elastic body 28 of the rubber bush 5, and the attitude control of the wheels 4 is smoothly performed, so that good riding comfort and maneuverability are always ensured. You.

By the way, in this suspension 1, when the trailing arm 2 swings up and down,
As described above, since the entire rubber bush 5 rotates with respect to the support shaft 7, the dust boot 3 has one end fixed to the inner cylinder 26 of the rubber bush 5 and the other end fixed to the support shaft 7.
A torsional force acts on 2,2. When the trailing arm 2 is displaced in the left-right direction of the vehicle body, the rubber bush 5 slides in the axial direction along the support shaft 7, so that one dust boot 32 is pulled and the other dust boot 32 is compressed. Is done. That is, both the torsional force and the tensile force act on the dust boot 32. Further, since one end of the dust boot 32 is merely locked by the circlip 34, deformation due to torsion or tension is transmitted to the inner edge of the circlip 34. For that purpose, the edge part is a rubber bush 5
Away from the side, a gap may develop between them. However, in the case of the rubber bush 5, the circlip 3 is provided between one end of the dust boot 32 and the mounting ring 33.
4 and the mounting ring 3
3 and the inner cylinder 26 of the rubber bush 5
Since the sealing is performed by sandwiching the extension portion 36 of 8, the water or the like is prevented from entering the dust boot 32 from the clearance even when such a clearance is generated. Further, the water or the like is also prevented from adhering to the inner cylinder 26. Therefore, rust does not occur on the boot mounting portion 35 of the inner cylinder 26. Since the mounting ring 33 is formed of a corrosion-resistant material such as stainless steel, there is no possibility that rust is generated even if water or the like adheres.

When assembling the dust boot 32 to the rubber bush 5, first, as shown in FIG.
1. Position on the outer surface. Then, the mounting ring 33 is pressed into the boot mounting portion 35 of the inner cylinder 26. Then, the extension 36 of the rubber-like elastic body 28 is sandwiched between the attachment ring 33 and the projection 31 of the inner cylinder 26. Next, as shown in FIG. 3, one end of the dust boot 32 is inserted into the outer peripheral groove of the mounting ring 33, and the circlip 34 is fitted and tightened from the outer peripheral side. Thereby, one end of the dust boot 32 is fixed to the rubber bush 5.
When removing the dust boot 32 from the rubber bush 5 side, the circlip 34 may be loosened and one end of the dust boot 32 may be pulled out from the mounting ring 33.

As described above, according to the sliding rubber bush 5, one end of the dust boot 32 is connected to the rubber bush 5.
Is mounted on the outer peripheral surface of the inner cylinder 26, the diameter of the dust boot 32 can be reduced, and the entire rubber bush 5 can be made compact. Further, since the extended portion 36 of the rubber-like elastic body 28 is sandwiched between one end of the dust boot 32 and the inner cylinder 26 of the rubber bush 5, only one end of the dust boot 32 is fastened by the circlip 34, 5 is reliably sealed. Therefore, the dust boot 32 can be easily attached and detached, and the maintenance and inspection work of the sliding portion between the rubber bush 5 and the support shaft 7 can be facilitated. In addition, since the space between the dust boot 32 and the rubber-like elastic body 28 of the rubber bush 5 is sealed, even if the edge portion is deformed by the torsional force or the tensile force acting on the dust boot 32, the end side is closed. This prevents water or the like from entering the dust boot 32 from adhering to the inner cylinder 26 of the rubber bush 5. Thus, the boot mounting portion 3 of the inner cylinder 26
Since there is no possibility that rust is generated in the inner cylinder 5, it is not necessary to perform a rust prevention treatment or the like on the inner cylinder 26, and an increase in manufacturing cost can be suppressed.

In the above embodiment, the mounting ring 33 is used to fix one end of the dust boot 32 to the inner cylinder 26 of the rubber bush 5, but a sufficient tightening force can be obtained by the circlip 34. If so, it is not necessary to use such a mounting ring 33. In such a case, the extension 36 of the rubber-like elastic body 28 is further extended outward, and the extension 36 is attached to the inner peripheral surface of the dust boot 32 and the inner cylinder 26 by the tightening force of the circlip 34. It is to be sandwiched between the outer peripheral surface. Further, as shown in FIG. 4, a circumferential groove is formed in the outer peripheral surface of both ends of the inner cylinder 26, one end of the dust boot 32 is fitted into the groove, and the circlip 34 is inserted from the outer peripheral side. You may make it tighten. As a means for tightening one end of the dust boot 32,
In addition to the circlip 34, an appropriate fastening tool can be used. Further, the present invention relates to a rubber bush 5 used for the rear suspension 1 of an automobile as in the above embodiment.
However, the present invention can be similarly applied to a rubber bush that is required to reduce the resistance in the axial direction and the rotation direction.

[0033]

As is apparent from the above description, according to the present invention, both sides of the inner peripheral portion of the rubber-like elastic body of the sliding rubber bush are formed on the outer peripheral surfaces of both ends of the inner cylinder. So that the extension is sandwiched between one end of the dust boot and the boot mounting part of the inner cylinder, so that the one end opening of the dust boot is completely sealed. Water or the like can be reliably prevented from entering the dust boot from the opening. In addition, since the space between the dust boot and the rubber-like elastic body of the rubber bush is sealed, it is possible to prevent water or the like from entering through the gap therebetween and sticking to the inner cylinder. Therefore, rust is prevented from being generated in the inner cylinder. Thus, it is not necessary to perform a rust-proofing treatment on the inner cylinder, so that the productivity of the rubber bush can be improved. And
Since one end of the dust boot is mounted on the outer peripheral surface of the inner cylinder of the rubber bush, its diameter can be reduced, and the entire rubber bush can be made compact. In addition, since one end thereof may be tightened from the outer peripheral side, a simple fastener such as a circlip can be used,
The attachment and detachment can be facilitated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a slide type rubber bush according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the rubber bush before the dust boot is assembled.

FIG. 3 is an enlarged sectional view of a main part showing a state in which a dust boot is attached to the rubber bush.

FIG. 4 is a cross-sectional view similar to FIG. 3, illustrating a modification of the dust boot mounting portion.

FIG. 5 is a plan view showing a rear suspension of an automobile using the rubber bush.

FIG. 6 is a side view of the rear suspension.

[Description of Signs] 1 Rear suspension 2 Trailing arm 5 Sliding rubber bush 7 Support shaft 26 Inner cylinder 27 Outer cylinder 28 Rubber elastic body 30 Sliding collar 32 Dust boot 33 Mounting ring (one end of dust boot) 34 Circlip 35 Boot attachment part 36 Extension part of rubber-like elastic body

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuki Suzuki 1-4-1 Chuo, Wako-shi, Saitama, Japan Honda R & D Co., Ltd. (72) Inventor Yasunori Hamaguchi 39-5 Daizen, Ueda-cho, Toyohashi-shi, Aichi Musashi Musashi In Precision Industry Co., Ltd. (56) References JP-A-2-66741 (JP, U) JP-A-5-1243111 (JP, U) JP-A-62-191028 (JP, U) (58) Fields surveyed ( Int.Cl. ⁷ , DB name) F16F 1/00-6/00 B60G 7/02 F16D 3/84

Claims (1)

(57) [Claims] 1. An inner cylinder rotatably fitted on the outer periphery of a support shaft and slidably fitted in an axial direction, and an outer cylinder concentrically arranged on the outer periphery side of the inner cylinder at an interval. A rubber bush comprising: a rubber-like elastic body disposed between the inner cylinder and the outer cylinder; and an outer peripheral surface at both axial ends of the inner cylinder.
A boot mounting portion to which one end of a dust boot that seals a sliding portion between the inner cylinder and the support shaft is formed, and both ends in an axial direction of an inner peripheral portion of the rubber-like elastic body. A slide-type rubber, in which an extension portion extending to the boot attachment portion is formed, and the extension portion is sandwiched between one end of the dust boot and the boot attachment portion of the inner cylinder. bush.