JPH0544594Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a bushing assembly used for mounting a suspension arm, etc.

[Prior Art] Conventionally, an inner cylinder, an outer cylinder arranged concentrically with the inner cylinder, an intermediate cylinder arranged concentrically between the inner cylinder and the outer cylinder, and an intermediate cylinder and the outer cylinder arranged concentrically with each other have conventionally been used. A bushing assembly is known that includes an elastic member interposed between the cylinder and a sliding member interposed between the inner cylinder and the intermediate cylinder.

In this type of bushing assembly, an elastic member interposed between the inner cylinder and the outer cylinder absorbs relative vibration in a direction crossing the axial direction between the inner cylinder and the outer cylinder, and the outer circumferential surface of the inner cylinder The sliding member slides using the boundary surface between the inner circumferential surface of the sliding member as a sliding surface, thereby reducing the torsion spring action caused by relative rotation between the inner cylinder and the outer cylinder. The integral body consisting of the outer cylinder, the elastic member, and the intermediate cylinder is connected to the inner cylinder via a sliding member, and by restricting and connecting the sliding member and the inner cylinder in the axial direction, The bushing assembly is integrally connected.

For example, as shown in FIG. 3, the inner cylinder 100 is
A cylindrical inner cylinder main body 101, a short cylindrical terminal collar 102 that is fitted to the inner peripheral surface of both ends of the inner cylinder main body 101, and a fitting part between the inner cylinder main body 101 and the terminal collar 102. A ring plate 103 is fitted so as to project outward in the radial direction, and radially outward extending portions 301 are formed near both ends of the intermediate cylinder 300 to extend outward in the radial direction. A bushing assembly has been disclosed in which a sliding member 500 is axially held between the radially outwardly extending portions 301 and the radially outwardly extending portions 301 (Japanese Unexamined Patent Publication No. 63-243540).

In addition, as shown in FIG.
The inner cylindrical portion 104 is divided into two cylindrical parts, each having a radially outwardly projecting flange portion 105 integrally formed near the end opposite to the abutting end, and the intermediate cylinder is also divided into two cylindrical parts. divided into parts 302, 302,
A radially outwardly extending portion 301 extending at least radially outwardly is integrally formed near the opposite end of the opposing end of the divided portion 302, and the sliding member 500 is connected to each flange portion of the inner cylinder 100. 105 and each radially outwardly extending portion 301 of the intermediate cylinder 300, a bush assembly is also disclosed (Japanese Patent Laid-Open No. 63-243540).

[Problem to be solved by the invention] However, in the conventional bushing assembly shown in FIG.
01, terminal collar 102, ring plate 103
Therefore, there are disadvantages of high cost and troublesome assembly.

Further, in the conventional bushing assembly shown in FIG. 4, the inner cylinder has two inner cylinder portions 104, 10.
4 coaxially abutted against each other, there is a drawback that water inside the inner cylinder leaks from the abutted ends to the vicinity of the sliding member 500, deteriorating the sliding member 500.

The technical problem to be solved by the present invention is to provide a bushing assembly that has a small number of parts, is easy to assemble, and prevents water inside the inner cylinder from leaking around the sliding member.

[Means for Solving the Problems] The bushing assembly of the present invention includes an inner cylinder, an outer cylinder disposed concentrically with the inner cylinder, and a bushing assembly arranged concentrically between the inner cylinder and the outer cylinder. an intermediate cylinder disposed near both ends thereof each having a radially outward extending portion extending at least radially outward; an elastic member interposed between the intermediate cylinder and the outer cylinder; and the inner cylinder and the intermediate cylinder. and a sliding member interposed between the inner cylinder and the outer cylinder to reduce the torsional spring action of the elastic member due to relative rotation between the inner cylinder and the outer cylinder, the inner cylinder having a diameter near one end. A main inner cylindrical member consisting of a first flange portion projecting outward in the radial direction and a cylindrical main body portion integrally formed with the first flange portion and having a small diameter portion on the outer circumferential surface of the other end; A sub-inner cylindrical member is comprised of a second flange portion projecting out to the main body portion, and a short cylindrical portion integrally formed with the second flange portion, and is fitted into the small diameter portion of the cylindrical main body portion. The sliding member is axially held between each radially outwardly extending portion of the intermediate cylinder and the first flange portion and the second flange portion.

The main inner cylinder member constituting the inner cylinder has a small diameter part formed on the outer circumferential surface of the end on the side where the first flange part is not formed, and a sub inner cylinder member on the axially inner end face of this small diameter part. The end faces of the two are held in contact with each other. Further, the second flange portion of the sub-inner cylinder member is formed at or near the axially inner end of the sub-inner cylinder member.

It is preferable that the outer cylinder is subjected to a drawing process from its outer peripheral surface. As a result, the intermediate cylinder is pressed radially inward through the elastic member, and rattling between the inner circumferential surface of the sliding member and the outer circumferential surface of the cylindrical main body of the inner cylinder is prevented.

Further, the outer cylinder is subjected to a drawing process from its outer circumferential surface, and the intermediate cylinder is integrally formed with a coaxially opposing cylindrical body having a shape divided at the center in the axial direction. and a radially outwardly extending portion extending at least radially outwardly near the opposite end of the cylindrical body.
It is preferable that the sliding member is a pair of semi-sliding members separated at the center in the axial direction, similar to the intermediate cylinder. By drawing the outer cylinder, each semi-intermediate cylinder is pressed radially inward through the elastic member, and the inner circumferential surface of each semi-sliding member and the outer circumferential surface of the cylindrical main body of the inner cylinder are In addition, each semi-intermediate cylinder is pressed outward in the axial direction via an elastic member, and each semi-sliding member is connected to each radially outwardly extending portion of the semi-intermediate cylinder and the inner cylinder. 1st
The flange portion and the second flange portion are more firmly sandwiched in the axial direction.

Note that a sealing member may be interposed between both ends of the inner peripheral surface of the intermediate cylinder and both ends of the outer peripheral surface of the inner cylinder in order to prevent water or the like from entering around the sliding member. In this case, it is preferable that the inner diameters of both left and right end portions of the intermediate cylinder in which the seal member is interposed are equal, and the outer diameters of both left and right end portions of the inner cylinder in which the seal member is interposed are equal. This allows the same seal member to be used at both left and right ends.

[Function] The bushing assembly of the present invention has an inner cylinder with a main inner cylinder member consisting of a cylindrical main body integrally formed near one end with a first flange projecting outward in the radial direction. Since the second flange projecting outward in the direction is composed of a sub-inner cylinder member consisting of an integrally formed cylindrical part, a By fitting the sub-inner cylinder member to the small diameter part, the sliding member can be securely moved in the axial direction by the radially outwardly extending parts formed near both ends of the intermediate cylinder and the first flange part and the second flange part. Can be held.

[Embodiments] Hereinafter, the bush assembly of the present invention will be described by way of embodiments with reference to the drawings.

FIG. 1 is a longitudinal sectional view of the bushing assembly of this embodiment. The bush assembly of this embodiment has an inner cylinder 1
and an outer cylinder 2 disposed concentrically with the inner cylinder 1,
An intermediate cylinder 3 is arranged concentrically between the inner cylinder 1 and the outer cylinder 2, an elastic member 4 is interposed between the intermediate cylinder 3 and the outer cylinder 1, and the inner cylinder 1 and the intermediate cylinder 3 are The sliding member 5 interposed between the inner peripheral surface of both ends of the intermediate cylinder 3 and the inner cylinder 1
It consists of a seal member 6 interposed between the outer peripheral surface near both ends of the inner cylinder 1, and a stopper fitting 7 fitted to one end of the inner cylinder 1 on the axially outer side of the seal member 6.

The inner cylinder 1 includes a metal main inner cylinder member 11 and a metal sub-inner cylinder member 1 that is fitted and fixed to the main inner cylinder member 11.
It is composed of 2. The main inner cylindrical member 11 has a first flange portion 11 protruding radially outward near one end.
1, and a cylindrical main body part 113 that is integrally formed with the first flange part 111 and has a small diameter part 112 on the outer peripheral surface of the other end. Sub-inner cylinder member 12
consists of a second flange portion 121 that extends outward in the radial direction at one end, and a short cylindrical portion 122 that is integrally formed with the second flange portion 121. 121 is the second flange portion 1
21 is fitted and fixed to the outer circumferential surface of the small diameter portion 112 such that the radially inward end surface of the small diameter portion 112 comes into contact with the axially inward end surface of the small diameter portion 112. Note that the outer diameters of both left and right end portions of the inner cylinder 1 in which the seal member 6 is inserted are equal.

The outer cylinder 2 is made of metal and includes a bulging part 21 whose one end side projects outward in the radial direction, and a cylindrical body 22 integrally formed from the bulging part 21. This outer cylinder 2 is subjected to a drawing process from its outer peripheral surface.

The intermediate cylinder 3 is composed of a pair of coaxially opposed metal semi-intermediate cylinders 31, 31. This semi-intermediate cylinder 31 includes a cylindrical body 312 and a cylindrical body 31.
A radially outwardly extending portion 313 integrally formed with the cylindrical body 312 at an end opposite to the opposing end of 2, and a radially outwardly extending portion 313 extending radially outwardly from the radially outwardly extending portion 313 continuously axially outwardly. and an extending large diameter end 314. Note that the inner diameters of both the left and right large diameter ends 314 where the seal member 6 is interposed are equal.

The elastic member 4 is made of a rubber elastic body, and is in contact with the inner peripheral surface of the cylindrical body 22 of the outer cylinder, the axially outer end surface of the bulging portion 21, and the radially outer peripheral surface of the intermediate cylinder 3. This elastic member 4 is filled between the outer cylinder 2 and the intermediate cylinder 3 in a state where they are arranged concentrically, and is integrated with the outer cylinder 2 and the intermediate cylinder 3 by vulcanization adhesion. Further, on the outer circumferential surface of the elastic member 4, two slits 41 extending in the axial direction are provided on the upper and lower sides at equal intervals in the circumferential direction, as shown in FIG.
Due to this slit 41, the elastic modulus of the elastic member 4 in the vertical direction in FIG. The amount of deformation can be varied in the circumferential direction.

The sliding members 5 are a pair of semi-sliding members 5 formed by injection molding of oil-impregnated plastic with good sliding properties.
It consists of 1,51. The semi-sliding member 51 is connected to the outer peripheral surface of the main inner cylinder member 11 and the cylindrical body 312 of the intermediate cylinder 3.
A cylindrical portion 511 sandwiched between the inner circumferential surface of
The flange 512 is sandwiched between the second flange portion 121 of the intermediate cylinder 3 and the radially outwardly extending portion 313 of the intermediate cylinder 3. The semi-sliding members 51 are press-fitted into the semi-intermediate cylinders 31, respectively.

The sealing member 6 is a ring-shaped member made of rubber, and a metal ring 61 having an L-shaped cross section is embedded in the outer peripheral surface of the sealing member 6, and a metal ring 61 having an L-shaped cross section is embedded in the outer circumferential surface of the sealing member 6 to connect each large diameter end 31 of the semi-intermediate cylinder 31.
The same thing is fixed to the inner peripheral surface of 4. A pleated seal portion 62 is formed on the inner circumferential surface of the seal member 6, and each of the seal portions 62 has a pleat shape.
It is in sliding contact with the outer circumferential surface of the first flange portion 111 on the axially outer side and the outer circumferential surface of the cylindrical portion 122 of the sub-inner cylinder member 12 .

The stopper fitting 7 has a generally ring-shaped overall shape, and extends from radially outward to axially inward and then radially outward again, so as to protect the sealing member 6, the elastic member 4, etc. axially outwardly and radially outwardly. The auxiliary inner cylinder member 12 of the main inner cylinder member 11 is press-fitted and fixed to the outer circumferential surface of the end on the side that is not fitted and fixed so as to surround the main inner cylinder member 11.

The bush assembly of this embodiment having the above configuration is used as follows.

First, with the outer cylinder 2 and the semi-intermediate cylinders 31, 31 arranged concentrically, the elastic member 4 is molded and cured, and is vulcanized and bonded to the outer cylinder 2 and the semi-intermediate body 31. , intermediate cylinder 3, and elastic member 4
form an integrated entity. Then, the semi-sliding member 51 is press-fitted into the inner cylindrical surface of each semi-intermediate cylinder 31 from the large diameter end 314 side, and then the main inner cylindrical member 11 is fitted onto the inner periphery of the sliding member 5 at the small diameter end. 112 side, and insert the sub-inner cylinder member 12 onto the outer peripheral surface of this small diameter portion 112.
are fitted and fixed by press-fitting. Note that in order to obtain smoother sliding performance, grease may be applied to the outer circumferential surface of the main inner cylinder member 11. Next, the outer cylinder 2 is subjected to a drawing process from the outer peripheral surface. And each semi-intermediate cylinder 3
The seal member 6 is press-fitted into the inner peripheral surface of the large diameter end 314 of the main inner cylinder member 11, and the stopper fitting 7 is press-fitted and fixed onto the outer peripheral surface of the main inner cylinder member 11.
Note that the drawing process of the outer cylinder 2 may be performed after the stopper fitting 7 is fitted and fixed.

In this state, fit the collar (not shown) of the suspension arm or the like to be supported by the bush assembly onto the outer periphery of the outer cylinder 2, and insert the inner cylinder 1 and the stopper between the legs of the mounting bracket (not shown). By sliding the metal fitting 7 and inserting a bolt (not shown) into the mounting bracket and the inner cylinder 1, it becomes ready for practical use.

In the bushing assembly of this embodiment, the sub inner cylinder member 12 having the second flange part 121 integrally formed therein is fitted into the small diameter part 112 of the main inner cylinder member 11 having the first flange part 111 integrally formed therein. By simply fitting and fixing, each radially outwardly extending portion 313 of the semi-intermediate cylinder 31, the first flange portion 111, and the second flange portion 121 can be connected.
The sliding member 5 can be held between the two in the axial direction. Therefore, the number of parts of the inner cylinder 1 is small and assembly is easy. In addition, the inner cylinder 1 has a cylindrical main body part 113.
Since it has a shape that extends continuously in the axial direction, deterioration of the sliding member 5 due to water etc. inside the inner cylinder leaking around the sliding member 5 can be reliably prevented.

In addition, in the bushing assembly of this embodiment, with the inner cylinder 1, the outer cylinder 2, the intermediate cylinder 3, the elastic member 4, and the sliding member 5 integrally connected, the outer cylinder 2 is subjected to drawing from the outer peripheral surface. In addition, the intermediate cylinder 3 and the sliding member 5 are each composed of a pair of half-intermediate cylinder 31 and a pair of semi-sliding member 51. Therefore, by drawing the outer cylinder 2, each semi-intermediate cylinder 31 is pressed outward in the axial direction via the elastic member 4, and as a result, the radially outward extending portion 313 of each semi-intermediate cylinder 31
and the first flange portion 111 and the second flange portion 12
1 can reliably hold each semi-sliding member 51 in the axial direction, and it is possible to prevent the sliding member 5 from wobbling in the axial direction. In addition, each semi-intermediate cylinder 3
1 is also pressed inward in the radial direction, so the sliding member 5
It is also possible to prevent rattling in the radial direction.

Furthermore, in the bush assembly of this embodiment, the outer peripheral surface of the elastic member 4 has a slit 4 extending in the axial direction.
1 is partially provided in the circumferential direction, it is also possible to change the elastic modulus of the elastic member 4 in the circumferential direction.

[Effects of the invention] As described in detail above, the bushing assembly of the invention has an inner cylinder with a first part protruding radially outward near one end.
a main inner cylindrical member consisting of a flange portion and a cylindrical main body portion that is integrally formed with the first flange portion and has a small diameter portion on the outer circumferential surface of the other end;
The intermediate cylinder is composed of a flange part and a short cylindrical part integrally formed with the second flange part, and a sub-inner cylinder member that is fitted and fixed to the small diameter part of the cylindrical main body part. A sliding member is axially held between the radially outward extending portions and the first and second flange portions.

Therefore, the inner cylinder is composed of only two parts, the main inner cylinder member and the sub-inner cylinder member, and has a simple structure and is easy to assemble. Further, since the cylindrical main body extends in the axial direction, it is possible to reliably prevent deterioration of the sliding member due to water or the like inside the inner cylinder leaking around the sliding member.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a bushing assembly according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the bushing assembly, FIG. 3 is a vertical cross-sectional view of a conventional bushing assembly, and FIG. 4 is a vertical cross-sectional view of a conventional bushing assembly. FIG. 3 is a longitudinal cross-sectional view of another conventional bushing assembly. 1,100...Inner cylinder, 2...Outer cylinder, 3,300
...Intermediate tube, 4...Elastic member, 5,500...Sliding member, 6...Seal member, 7...Stopper fitting, 11...Main inner cylinder member, 111...First flange portion, 112... ... Small diameter part, 113 ... Cylindrical main body part, 12 ... Sub-inner cylinder member, 121 ... Second flange part, 122 ... Cylindrical part, 31 ... Semi-intermediate cylinder, 3
12... Cylindrical body, 313... Radial outward extension, 3
14...Large diameter end, 51...Semi-sliding member.

Claims (1)

[Scope of claim for utility model registration] An inner cylinder, an outer cylinder arranged concentrically with the inner cylinder,
an intermediate cylinder disposed concentrically between the inner cylinder and the outer cylinder and having radially outwardly extending portions near both ends thereof each extending at least radially outward; and between the intermediate cylinder and the outer cylinder; an interposed elastic member; and a sliding member interposed between the inner cylinder and the intermediate cylinder to reduce the torsion spring action of the elastic member that occurs when the inner cylinder and the outer cylinder rotate relative to each other. In the bushing assembly, the inner cylinder has a cylindrical body having a first flange portion protruding radially outward near one end, and a small diameter portion integrally formed with the first flange portion and on the outer peripheral surface of the other end. The main inner cylindrical member consists of a main inner cylindrical member consisting of a second flange portion projecting outward in the radial direction, and a short cylindrical portion integrally formed with the second flange portion. and a sub-inner cylinder member fitted into the small diameter part, and the sliding member is axially held between each radially outwardly extending part of the intermediate cylinder and the first flange part and the second flange part. A bushing assembly characterized by: