JPH09151975A - Slide bush structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the relative position between the inner cylinder and outer cylindrical body of a slide bush to prevent the occurrence of a foreign sound. SOLUTION: A pair of slide bushes 10, 20 opposed to each other are inserted into a hollow bearing boss 4 on one end 4a side and the other end 4b side, respectively. The contact part 16a of a sliding sleeve 16 is brought into contact with the flange part 11a of each inner cylinder 11. A male screw 24 is formed on the outer surface of the outer cylindrical body 22 of the slide bush 20. A lock nut 26 screwed to the male screw 24 is fastened to the one end 4a of the bearing boss 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding bush structure used for a connecting portion such as an arm and a link in a vehicle suspension, and particularly to a sliding portion suitable for a link connecting portion of a multi-link suspension in a front suspension. Regarding bush structure.

[0002]

2. Description of the Related Art Generally, in a multi-link type suspension for a vehicle front suspension, as shown in FIG. 5, an upper link 1 is provided between a third link 2 on the axle side and a vehicle body side (not shown). Is rotatably connected to. In the link bearings 3 and 3 forming the connecting portions on both sides of the upper link 1, sliding bushes are incorporated around their axes to form a sliding bush structure.

For example, in the sliding bush structure disclosed in Japanese Patent Application Laid-Open No. 4-302726 shown in FIG. 6 previously proposed by the present applicant, the upper link 1 and the third link 2 are provided.
In the link bearing portion 3 which is the connecting portion of the above, a pair of sliding bushes 10a and 10b are provided so as to face each other in a hollow bearing boss 4 formed at the end of the upper link 1.

Each of the sliding bushes 10a and 10b has the same structure and includes an inner cylinder 11 made of metal and an outer cylinder body 12 provided on the outer surface of the inner cylinder 11. Both the inner cylinders 11 and 11 are interposed between the opposing brackets 5 and 5 formed at the end portion of the third link 2, and are fixed together by a mounting bolt 6 and a nut 7 that are inserted therethrough to fix the third link 2 and the shaft. Rotate integrally around.

Each of the outer cylinders 12 is formed by integrally vulcanizing and adhering a metal outer cylinder 13, an elastic member 14, and a rigid sleeve 15, and a sliding sleeve 16 made of a synthetic resin material is press-fitted into the inner surface of the outer cylinder 12. Composed. The elastic member 14 is interposed between the outer cylinder 13 and the rigid sleeve 15, is made of a vulcanized rubber material, and has a function of absorbing an external impact or the like. Each outer cylinder 12
The outer surface of the outer cylinder 13 is pressed against the inner surface of the bearing boss 4 to rotate integrally with the bearing boss 4 about the axis, and the sliding sleeve 1
The inner surface of the inner cylinder 6 is in sliding contact with the outer surface of the inner cylinder 11, and relatively slides and rotates with respect to the inner cylinder 11 when the upper link 1 and the third link 2 relatively rotate.

7 and 8 show the sliding bush 10a,
The process of assembling 10b in the bearing boss 4 is shown. In the sliding bushes 10a and 10b before being mounted on the bearing boss 4,
An abutting portion 16a bent at one end of the sliding sleeve 16 is in contact with a flange portion 11a formed on the inner cylinder 11.

First, one sliding bush 10a (see FIGS. 7 and 8).
Then, the lower sliding bush) is press-fitted until the flange portion 13a formed on the outer cylinder 13 contacts the one end 4a of the bearing boss 4 (the state shown in FIG. 7). Next, the other sliding bush 10b (the upper sliding bush in FIGS. 7 and 8) is press-fitted into the bearing boss 4 from above, and the tip of the inner cylinder 11 is brought into contact with the tip of the inner cylinder 11 of the lower sliding bush 10a. After that, press-fitting is further performed by 0 to 0.3 mm (state shown in FIG. 8). The adjustment of the press-fitting amount is performed based on the linear type sensor 8 connected to the sliding bush 10b. With the sliding bushes 10a and 10b assembled, a required gap between the other end 4b of the bearing boss 4 and the flange portion 13a of the sliding bush 10b for absorbing a processing accuracy error between each member. A is formed.

[0008]

However, when the sliding bushes 10a and 10b shown in FIG. 8 are loaded in an actual vehicle, a large external force is applied to the sliding bush 10b in the direction of the axis CC thereof due to, for example, impact vibration from the road surface. The outer cylinder 12 of the sliding bush 10b, the bearing boss 4
Further, the initial gap A disappears or reduces (the state shown in FIG. 6). At this time, the inner cylinder 11 of the sliding bush 10a is pressed by the inner cylinder 11 of the sliding bush 10b and moves in a direction away from the bearing boss 4.
The outer cylinder body 12 slidingly contacting the inner cylinder 11 slides with the inner cylinder 11 having a relatively low sliding resistance, and as a result, the initial gap A disappears or reduces as shown in FIG. Accordingly, a gap A1 is formed between the flange portion 11a of the inner cylinder 11 and the abutting portion 16a of the sliding sleeve 16, or the gap A1 is formed.
Becomes larger.

When such a gap A1 is generated, the inner cylinder 11 and the outer cylinder 12 are axially aligned with each other along the axis C--C on the sliding contact surface where the inner cylinder 11 and the outer cylinder 12 slide and rotate due to vibration of the vehicle body or the like. Direction relative movement, and the flange portion 11a and the abutting portion 16
An abnormal noise due to a contact noise or the like is generated between a and a. In addition, there is a problem that the suspension characteristics are changed due to changes in the vehicle geometry.

An object of the present invention is to prevent the generation of abnormal noise by changing the relative positions of the members even when a large external force is applied due to a sudden change in the posture of the vehicle, etc. It is to be able to maintain the required characteristics.

[0011]

In order to solve the above problems, the sliding bush structure according to the present invention is a sliding bush structure in which a pair of sliding bushes facing each other are interposed in a hollow bearing boss. The respective sliding bushes are inserted into the inner surface of the bearing boss, and the outer cylindrical body in which the elastic member is interposed and the inner cylindrical surface of the outer cylindrical body are slidably contacted and relatively slidably rotated about the axis. An outer cylinder having an inner cylinder formed with flanges that face each other with substantially no gap at the end of the outer cylinder, and a male screw is formed on the outer surface of the outer cylinder of at least one of the sliding bushes, and is screwed to this male screw. The lock nut is in contact with one end of the bearing boss.

With such a structure, when a large external force acts on the sliding bush due to a sudden change in posture of the vehicle, for example, the lock nut screwed into the outer cylinder is in contact with the end portion of the bearing boss. The outer cylinder does not enter the bearing boss.

Desirably, a female screw to which a male screw of the outer cylinder is screwed is formed on the inner surface of the bearing boss so that the outer cylinder and the bearing boss do not move relative to each other. In this case, the outer cylinder body and the inner cylinder body of the sliding bush are more reliably prevented from moving relative to the bearing boss.

The end of the outer cylinder and the flange of the inner cylinder are
The outer cylinder and the inner cylinder are opposed to each other to the extent that no abnormal noise is generated when they relatively move in the axial direction, that is, they are substantially opposed to each other without a gap, for example, abutted or extremely close to each other. Facing each other.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. It should be noted that the same or similar components as those of the conventional example are denoted by the same reference numerals, and the description of the overlapping portions will be appropriately omitted.

The sliding bush structure according to the present embodiment is applied to, for example, a multi-link type suspension in a vehicle front suspension. More specifically, as shown in FIG. 5, the vehicle body side (not shown) and the upper link 1 are connected. And the link bearings 3 and 3 which are connecting portions between the third link 2 on the axle side and the upper link 1.

FIG. 1 shows a sliding bush structure of this embodiment used for a link bearing portion 3 which is a connecting portion between the upper link 1 and the third link 2, and a hollow bearing boss formed at an end portion of the upper link 1. A pair of sliding bushes 10 and 20 are provided in the inside of the bearing 4 so as to face each other. Here, in the figure, the sliding bush 10 on the right side has substantially the same configuration as the conventional one, and the sliding bush 20 on the left side is the same.
Is an improvement according to the present invention.

The sliding bush 10 includes a metal inner cylinder (inner cylinder body) 11 and an outer cylinder body 12 slidably contacting the outer surface of the inner cylinder 11.
While the sliding bush 20 has a metal inner cylinder 11
And an outer cylinder body 22 which is improved in shape. Both inner cylinders 11 and 11 contact each other at the tips,
The bolts 5 and the nuts 7 that pass through these are fastened together to the brackets 5 and 5 of the third link 2 so that the axis C
Rotate around C together with the third link 2.

The outer cylinder 12 of the sliding bush 10 on the right side of the figure is an outer cylinder 13 made of metal, an elastic member 14 made of a rubber material, and a rigid sleeve 1 for reinforcing the elasticity of the elastic member 14.
5 is integrally vulcanized and bonded, and a sliding sleeve 16 made of a synthetic resin material is press-fitted onto the inner surface of the elastic member 14. The elastic member 14 is interposed between the outer cylinder 13 and the rigid sleeve 15 so that an external shock is generated. It has the function of absorbing the like. The outer cylinder 12 is
The outer surface of the outer cylinder 13 is pressed against the inner surface of the bearing boss 4 to rotate integrally with the bearing boss 4 about the axis, and the sliding sleeve 16
The inner surface is in sliding contact with the inner cylinder 11, and relatively rotates with respect to the inner cylinder 11 when the upper link 1 and the third link 2 relatively rotate.

The outer cylindrical body 12 abuts on the flange portion 11a formed on the inner cylinder 11 at the end portion thereof, that is, the abutting portion 16a formed by bending at the outer end portion of the sliding sleeve 16, with substantially no gap. Also, at the flange portion 13a formed by bending at one end of the outer cylinder 13, one end 4a of the bearing boss 4 is formed.
Is in contact with As a result, the outer cylindrical body 12 has an axis C-C.
In this direction, the bearing boss 4 and the inner cylinder 11 are relatively positioned.

On the other hand, the sliding bush 20 on the left side in the figure
The outer cylinder body 22 has basically the same structure as the outer cylinder body 12 of the sliding bush 10, and has an outer cylinder 23 having an external thread 24 formed on its outer surface, the elastic member 14, and the rigid sleeve 15.
Are integrally vulcanized and bonded, and the sliding sleeve 16 is press-fitted to the inner surface of the structure. The outer tubular body 22 is in contact with the flange portion 11a formed on the inner tubular body 11 at the end portion thereof, that is, the abutting portion 16a formed by bending at the outer end portion of the sliding sleeve 16, with substantially no gap.

A male screw 24 formed on the outer surface of the outer cylinder 23
Is a flange portion 23 of the outer cylinder 23, as shown in FIG.
A predetermined width is formed from the a-side base end portion toward the tip, and is screwed into a female screw 25 formed on the inner surface of the bearing boss 4 on the other end 4b side. Between the flange portion 23a formed by bending the outer cylinder 23 of the sliding bush 20 and the other end 4b of the bearing boss 4, a required clearance A for absorbing a processing accuracy error between each member and the like.
Are formed. And, in the male screw 24 of the outer cylinder 23,
The lock nut 26 located in this gap A is screwed. The lock nut 26 is driven by the bearing boss 4 with a predetermined torque.
The end surface of the lock nut 26 is pressed against the other end 4b of the bearing boss 4, and the outer cylinder body 22 and the bearing boss 4 are firmly screwed together via the lock nut 26. As a result, the outer cylindrical body 22 does not move in the direction of the axis C-C with respect to the bearing boss 4, and is positioned relatively to the bearing boss 4 and the inner cylinder 11.

With the above construction, when the vehicle suddenly changes its posture due to the impact force from the road surface during traveling, for example, when an external force along the axis C--C of FIG. 1 acts from the direction of arrow P, The outer cylindrical body 22 of the sliding bush 20 further tries to enter the bearing boss 4 (direction in which the gap A is reduced). However, in this embodiment, the outer cylinder 23 of the outer cylinder 22 is
Since the lock nut 26 screw-connected to the bearing boss 4 is in pressure contact with the bearing boss 4, the outer cylinder 23 and the inner cylinder 11 are prevented from moving relative to the bearing boss 4 in the axial direction CC. There is.

On the other hand, the axis C--C from the direction opposite to the arrow P
When an external force along the direction is applied, the sliding bush 10
The outer cylinder body 12 of the outer cylinder 13 tries to enter the bearing boss 4, but since the flange portion 13a of the outer cylinder 13 is in contact with one end 4a of the bearing boss 4, the outer cylinder 13 and the inner cylinder 11 are attached to the bearing boss 4. On the other hand, there is no relative movement in the axis C-C direction.

As described above, in this embodiment, each member of the sliding bushes 10 and 20 does not move relative to the bearing boss 4 even when a large external force is applied.
The initial gap A is maintained. As a result, there is substantially no gap between the flange portion 11a of the inner cylinder 11 of each of the sliding bushes 10 and 20 and the abutting portion 16a of the sliding sleeve 16, and the flange portion 11a and the abutting portion are held. 16
No abnormal noise due to a hitting sound is generated between the a and the suspension characteristic due to the geometry of the vehicle, and the required characteristic can be maintained.

2 to 4 are assembly sectional views showing a process of assembling the sliding bushes 10 and 20. In the sliding bushes 10 and 20 before being assembled to the bearing boss 4, as shown in FIG. 2, the flange portion 11a of the inner cylinder 11 and the abutting portion 16a of the sliding sleeve 16 are in contact with each other without a gap.
In the sliding bush 20 shown above the bearing boss 4 in FIG. 2, the lock nut 26 screwed onto the outer surface of the outer cylinder 23 is used.
Has been moved to the base end portion side closest to the flange portion 23a.

First, one sliding bush 10 is press-fitted into the bearing boss 4 from the one end 4a side of the bearing boss 4 until the flange portion 13a of the outer cylinder 13 comes into contact with the one end 4a of the bearing boss 4 (FIG. 2). State). Then slide bush 2
0 is inserted from the other end 4b side of the bearing boss 4, the male screw 24 of the sliding bush 20 is screwed into the female screw 25 of the bearing boss 4, and the outer cylinder 23 is rotated in the direction in which the sliding bush 20 enters the bearing boss 4. Then, after the inner cylinder 11 of the sliding bush 20 abuts on the inner cylinder 11 of the opposite sliding bush 10, the inner bush 11 is further rotated so as to be inserted by 0 to 0.3 mm. The amount of press-fitting is adjusted based on the detection sensor 8 connected to the sliding bush 20.

Next, the lock nut 26 is rotated to rotate the outer cylinder 2
3 is moved in the axial direction along the male screw 24, the end surface of the lock nut 26 is brought into contact with the other end 4b of the bearing boss 4, and further tightened with a predetermined torque, so that the outer bush 22 of the sliding bush 20 and The bearing boss 4 is firmly screwed (Fig. 3,
4). After this, the inner cylinders 11 and 11 of the sliding bushes 10 and 20 and the brackets 5 and 5 are fastened together by the mounting bolts 6 and nuts 7 and loaded into the actual vehicle (state shown in FIG. 1).

Although the internal thread 25 is formed on the inner surface of the bearing boss 4 in this embodiment, for example, the internal thread may not be formed on the inner surface of the bearing boss 4. In this case,
A press-fitting surface is formed on the outer surface near the tip of the sliding bush 20 so as to be thicker than the surface of the sliding bush 20 on which the male screw 24 is formed and press-contact with the inner surface of the bearing boss 4. In this case, the bearing boss 4 conventionally used can be applied as it is without any processing.

[0030]

As is apparent from the above description, the sliding bush structure of the present invention is effective when applied to, for example, an upper link of a multi-link type suspension in a front suspension for a vehicle, and can be applied to a sudden vehicle. Even if a large external force is input due to a change in posture or the like, it is possible to prevent the sliding bush including the outer cylinder from being displaced with respect to the bearing boss, and therefore, an unnecessary gap is not created between the inner cylinder and the outer cylinder. It is possible to prevent abnormal noise from being generated and to maintain the required suspension characteristics.

[Brief description of the drawings]

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

FIG. 2 is an assembled sectional view showing an assembling process of the sliding bush of FIG.

FIG. 3 is another assembly sectional view showing the assembling process of the sliding bush of FIG.

4 is an enlarged cross-sectional view of the vicinity of the sliding bush of FIG.

FIG. 5 is a perspective view of a front suspension in a vehicle multi-link suspension.

FIG. 6 is a sectional view showing a conventional sliding bush structure.

7 is a cross-sectional view showing a mounting process of the sliding bush of FIG.

FIG. 8 is another cross-sectional view showing a mounting process of the sliding bush of FIG.

[Explanation of symbols]

 4 ... Bearing boss 4a ... One end 4b ... The other end 10, 20 ... Sliding bushing 11 ... Inner cylinder 12, 22 ... Outer cylinder body 13, 23 ... Outer cylinder 13a, 23a ... Flange part 24 ... Male screw 25 ... Female screw 26 ... Lock nut

Claims (2)

[Claims] 1. A sliding bush structure in which a pair of sliding bushes facing each other are interposed in a hollow bearing boss, each sliding bush is inserted into an inner surface of the bearing boss, and an elastic member is interposed. An outer cylinder body mounted on the outer cylinder body is slidably in contact with the inner surface of the outer cylinder body so as to relatively rotate around the axis, and a flange portion is formed at the end of the outer cylinder body so as to face the end portion with substantially no space. A male screw is formed on the outer surface of the outer barrel of at least one of the sliding bushes, and a lock nut screwed to this male screw is in contact with one end of the bearing boss. Sliding bush structure. 2. A female screw to which a male screw of the outer cylinder is screwed is formed on an inner surface of the bearing boss, and the outer cylinder and the bearing boss are configured so as not to move relative to each other. The sliding bush structure according to claim 1, wherein: