JP2571670Y2 - 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, and more particularly to a slide type rubber bush which is rotatable with respect to a support shaft and slidable in an axial direction. is there.

[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 separately bonded to the inner cylinder and the outer cylinder. 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.

As a rear suspension of an automobile, there is one in which the attitude of wheels during bump rebound is controlled by one trailing arm and three lateral links.
As disclosed in Japanese Unexamined Patent Publication, the entire end of the trailing arm extends forward from the vehicle-body-side connecting portion,
A rear suspension in which one of the three lateral links is connected has been proposed. In such a suspension, a front-rear impact force applied to the wheels is transmitted to the vehicle body via a trailing arm. Therefore, a rubber bush is used in the vehicle body connecting portion of the trailing arm in order to improve the compliance by absorbing the impact force.

In the case of the above-mentioned suspension,
It is desired that the rubber bush used for the vehicle body side connecting portion of the trailing arm be rotatable with respect to the support side and slidable in the axial direction. 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 as described above, water, dust and the like may 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 132 is provided which is coupled to the rubber bush 105 and the other end of which is not shown is fixed to the outer peripheral surface of the support shaft, and the sliding portion is sealed from the outside. I have to. Since the dust boot 132 is detachably attached to the inner cylinder 126 of the rubber bush 105, circumferential projections 131, 139 and peripheral projections 13 are provided at both ends in the axial direction of the outer peripheral surface of the inner cylinder 126.
One large opening 136 of the dust boot 132 is fastened by a circlip 137 or the like to a boot receiving portion 135 having a mounting groove 138 on the inner side adjacent to the first and 139.

[0006]

However, when the above-mentioned boot mounting portion 135 is provided on the outer peripheral surface of the inner cylinder 126 as described above, a thin circumferential projection is obtained by applying machining or the like to the pipe material. Since complicated shapes such as 131 and 137 and the groove 138 are formed, processing is difficult, and costs such as machining are relatively high, so that productivity is reduced.

[0007] The present invention has been made in view of such a situation, and an object of the present invention is to provide a sliding type rubber bush as described above which does not require any complicated processing or structure to be mounted. An object of the present invention is to provide a structure capable of preventing the boot from falling off.

[0008]

The sliding collar has both ends in the axial direction formed at the axial ends of the inner cylinder at flange portions bent at right angles to the outer shape. The radial length from the outer circumference to the outer circumference of the mounted portion is set to be longer than the radial length from the inner circumference of the sliding collar to the outer circumference.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a sliding rubber bush 5 according to the present invention, and FIG. 1 is a longitudinal sectional view thereof.

The rubber bush 5 is provided with an inner cylinder 26, an outer cylinder 27 which is arranged concentrically at an outer peripheral side of the inner cylinder 26, and is arranged between the inner cylinder 26 and the outer cylinder 27. And a rubber-like elastic body 28. The rubber-like elastic body 28 has a ring shape, and its inner and outer peripheral surfaces are flow-bonded to the inner cylinder 26 and the outer cylinder 27, respectively, whereby the inner and outer cylinders 26 and 27 are connected to each other. The rubber bush 5 is fixed to the trailing arm by press-fitting the outer cylinder 27 into an opening provided in a vehicle-body-side connecting portion of a trailing arm (not shown).

On the inner peripheral surface of the inner cylinder 26 of the rubber bush 5,
A sliding collar 30 made of a resin material such as polyacetal 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.

As shown in FIG. 4, the sliding collar 30 mounted on the inner peripheral surface of the inner cylinder 26 has a plurality of slits 40 extending in the axial direction in a cylindrical portion 33 thereof. Are alternately opened at both ends of the sliding collar 30, and a shallow groove 42 is provided on the inner peripheral surface of the end that does not open. The slit 40 is provided for the purpose of reducing the diameter of the sliding collar 30 and assembling it with the inner cylinder 26. The assembled slide collar 30 is fitted to the support shaft 7 without play, and as shown in FIG. 3, the air communication extending in the axial direction between the support collar 7 and the slit 40 as shown in FIG. A passage is formed, and spaces in the dust boots 32 provided on both sides of the rubber bush 5 communicate with each other via the air communication passage.

Further, at both ends in the axial direction of the sliding collar 30, flange portions 31, 31 bent at right angles to the outer diameter direction at positions at both axial ends of the inner cylinder 26 are formed, and the flange portions 31, 31 are formed. 31 is an inner cylinder 26 and a rubber-like elastic body 28
Are respectively engaged with both end faces.

When such a sliding collar 30 is assembled to the inner cylinder 26 of the rubber bush 5, the maximum outer diameter of the sliding collar 30 is reduced in the radial direction so as to be smaller than the inner diameter of the inner cylinder 26. Thereafter, the sliding collar 30 is inserted into the inner cylinder 26. The flanges 31, 31 at both ends of the sliding collar 30, which has been elastically restored after the insertion, are engaged with the respective end faces of the inner cylinder 26,
A sliding collar 30 having a desired shape is mounted on the inner cylinder 26.

The flange portions 31 and 3 of the sliding collar 30
Regarding the molding of No. 1, the sliding collar 30 having a desired shape can be easily obtained by molding the resin material by injection processing or the like.

The rubber bush 5 has a rubber-like elastic body 28 mounted thereon and covers the outer peripheral surface of the inner cylinder 26. The rubber bush 5 is provided on the outer periphery of both ends in the axial direction of the inner cylinder 26 covered with the rubber-like elastic body 28. Cylindrical dust boots 32, 32 made of an airtight and flexible material such as a thin wall, rubber, or the like are arranged between the mounting portions 35, 35 to be formed and both ends of the support shaft 7. Here, as shown in FIG. 2, the radial length H from the inner circumference of the sliding collar 30 to the outer circumference of the flange portion 31 is a diameter from the inner circumference of the sliding collar 30 to the outer diameter of the mounting portion 35. It is set longer than the direction length h. Then, the mounted parts 35, 3
5, one end opening 3 of the dust boots 32, 32
After being press-fitted into the mounted portions 35, 35, the circlips 34 are locked and fixed to the mounting portions 6, 36 in a state in which movement in the axial direction is restricted by being tightened.

In the slide-type rubber bush 5 assembled as described above, the radial length H from the inner periphery of the sliding collar 30 to the outer periphery of the flange portion 31 is determined from the inner periphery of the sliding collar 30 to the mounting portion 35. Is set to be longer than the radial length h up to the outer diameter of the dust boots 32, 32, the one end openings 36, 36 of the dust boots 32, 32 mounted on the mounted portions 35, 35 are supported so that they cannot be removed in the axial direction. .

Further, the present invention can be applied not only to the rubber bush 5 used for the suspension of the vehicle as in the above embodiment but also to a rubber bush having another structure.

[0020]

As described above, according to the present invention, the radial length from the inner circumference of the sliding collar to the outer circumference of the flange portion is equal to the diameter from the inner circumference of the sliding collar to the outer diameter of the mounting portion. Since the length is set to be longer than the length in the direction, the one end opening of the dust boot mounted on the mounted portion is supported so as not to be able to be removed in the axial direction. Therefore, the attached dust boot can be prevented from coming off without requiring complicated processing and structure.

[Brief description of the drawings]

FIG. 1 is a partial sectional plan view showing an embodiment of a sliding rubber bush according to the present invention.

FIG. 2 is an enlarged partial cross-sectional plan view showing part A of the sliding rubber bush of FIG.

FIG. 3 is a partial cross-sectional plan view of FIG. 1 as viewed from a direction B.

FIG. 4 is a front view showing an embodiment of a sliding collar used in the sliding rubber bush of the present invention.

FIG. 5 is a partial cross-sectional plan view showing a main part of a conventional slide rubber bush.

[Explanation of symbols]

5 Slide-type rubber bush 7 Support shaft 26 Inner cylinder 27 Outer cylinder 28 Rubber-like elastic body 30 Sliding collar 31 Flange part 32 Dust boot 35 Mounting part H Radial length from inner circumference of sliding collar to outer circumference of flange part H h Radial length from inner circumference of sliding collar to outer diameter of mounted part

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner cylinder (26) rotatably and axially slidably fitted on an outer periphery of a support shaft (7), and an inner cylinder (26) spaced apart from the outer periphery of the inner cylinder (26). An outer cylinder (27) arranged concentrically; a rubber-like elastic body (28) arranged between the inner cylinder (26) and the outer cylinder (27);
6) a sliding collar (30) made of a resin material disposed between the support shaft (7) and a mounting portion (35) formed on outer peripheral sides of both ends in the axial direction of the inner cylinder (26). , (35)
Between the inner cylinder (2) and the outer peripheral surface of the support shaft (7).
In a sliding rubber bush provided with dust boots (32) and (32) for sealing a sliding portion between 6) and the support shaft (7), both ends in the axial direction of the sliding collar (30) are Flanges (31), (31) bent at right angles to the outer diameter direction at positions at both ends in the axial direction of the inner cylinder (26) are formed from the inner periphery of the sliding collar (30) to the flange ( The radial length (H) from the inner circumference of the sliding collar (30) to the outer diameter of the mounted portion (35) is set to be longer than the radial length (H) of the outer circumference of the sliding collar (30). A sliding rubber bush characterized by the above-mentioned.