JPH0319610Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to an elastomer joint that combines ball joint action and rubber bushing action, and more specifically is generally used in steering link arms, power steering systems, front wheel suspension systems, etc. This invention relates to a rotatable and swingable elastomer joint.

Prior Art An elastomer joint in which a stud head is pivotally supported in a socket via a rubber layer, and the stud is made swingable and rotatable by stretching the rubber layer baked into the center of the head, is disclosed in Japanese Patent Application Laid-open No. There are issues such as 1985-6085.

That is, in this type of elastomer joint, a rubber layer is baked onto the center of the stud head, and the rubber layer is compressed and fixed in direct contact with the inner periphery of the socket so that the outer periphery of the rubber layer does not slide on the inner periphery of the socket.

Problems to be Solved by the Invention In conventional elastomer joints, when the stud is given rotational motion around its axis, the stud shaft center member stretches the rubber layer and rotates, so the allowable stud rotation angle is self-limited to a small value. Moreover, there was a problem in that the stud rotational torque also increased significantly in proportion to the stud rotation angle.

Means for solving the problem A recess is formed by cutting out the rubber layer on the outer periphery of the stud head on the side opposite to the socket opening, and lubricating oil is sealed in the recess, and at the same time, on the outer periphery of the rubber layer,
A groove communicating with the recess is formed.

Function When the stud is given rotational motion around its axis and the stud rotational torque increases, the rubber layer deforms, and as the rubber layer deforms, the groove volume changes and lubricating oil is pumped from the recess into the groove. Since it can be sucked in, slippage occurs on the contact surface between the rubber layer of the stud head lubricated with lubricating oil and the bearing, and the stud head slides on the bearing surface.

Embodiment The structure of an embodiment of the present invention will be explained below with reference to the drawings.

FIG. 1 shows the elastomer joint 1 attached to a connecting member 17, in which 2 is a steel socket, 7 is a resin bearing, and 10 is a stud.

The socket 2 has a bottom portion 3 at one end and an opening 6 at the other end from which the shaft portion 11 of the stud 10 swingably projects.

The bearing 7 has a substantially cylindrical shape and pivotally supports the head 16 of the stud 10. Also, the bearing 7 is
The opening is narrowed to prevent the stud head 16 from coming off, and it is fixed in the socket 2 by a curved shoulder 5 of the socket which is formed into a curve when the joint is assembled.

The stud 10, as also shown in FIG.
It is composed of a stud shaft core member 9 made of steel and a rubber part that is baked and bonded to the outer periphery of the stud shaft member 9.

The stud shaft center member 9 has a head center portion 12 that is bulged at one end of a shaft portion 11 .

This head center 12 and the rubber layer 13 surrounding it
constitutes the head 16 of the stud 10 which has a vibration absorbing function.

Since the rubber layer 13 of the head 16 is stored in the socket 2 and the bearing 7 in a predetermined compressed state, the outer diameter in the free state is larger than the inner peripheral dimension of the storage portion by a predetermined amount.

The stud 10 also has the rubber layer 1
A connecting part 15 is formed by extending rubber from the connecting part 15 in the direction opposite to the head 12, and a dust cover part 14 is formed by extending a rubber with a large diameter from the connecting part 15 in the direction opposite to the head.

Note that the dust cover part 14 is reversed in the direction of the head 16 when the elastomer joint 1 is attached to the connecting member 17, so that the end part comes into contact with the curved shoulder part 5 of the socket 2 and extends around the socket opening 6. This space is isolated from the outside world.

This elastomer joint 1 supplies lubricating oil to the sliding surface between the bearing 7 and the rubber layer 13.
A stud head 18 is provided, and an appropriate amount of lubricating oil 19 such as grease is placed in the space inside the socket formed by the recess formed by cutting out the rubber layer 13 on the outer periphery of the recess 11 on the side opposite to the socket opening 6. is included.

In order to enhance the effect of supplying lubricating oil to the sliding surfaces, a plurality of grooves 17 communicating with the recesses 18 are formed on the outer periphery of the rubber layer 13, as shown in FIG. This groove 17 prevents the lubricating oil 19 from flowing out to the outside through the socket opening 6, and the groove volume changes due to the deformation of the rubber layer 13 that occurs during use of the joint 1, and the lubricating oil flows from the recess 18 into the groove. 19 is not communicated with the socket opening 6 side so that it can be sucked in.

The elastomer joint 1 configured in this way is
When the stud 10 tilts, the rubber layer 13 of the head 16 deforms to allow this, and the stud 10
When the stud rotates about its axis, the rubber layer 13 deforms until the rotational torque increases appropriately, and when the rotational torque increases appropriately, the stud head 16 slides against the bearing surface to accommodate it.

That is, this elastomer joint 1 is supported so that when the stud 10 is given a rotational motion around its axis and the stud rotational torque increases, the head 16 will slip on the contact surface with the bearing 7.

The outer periphery of the rubber layer 13 is not bonded with adhesive or the like to the contact surface of the bearing 7, but rather the lubricating oil 19 is applied to the sliding surface so that the rubber layer 13 can easily slide on the bearing surface as described above. The configuration is as follows:

Effects As described above, according to the present invention, when the stud is given a rotational motion around its axis and the stud rotational torque increases, the rubber layer deforms, and the groove volume changes as the rubber layer deforms. Since lubricating oil is sucked from the recess into the groove, slipping occurs on the contact surface between the rubber layer of the stud head and the bearing, and the stud head slides on the bearing surface, so a rubber vibration absorption function is created in the socket. It is possible to increase the permissible stud rotation angle of a joint having a stud rotation angle and to reduce the stud rotation torque regardless of an increase in the stud rotation angle.

[Brief explanation of the drawing]

1 represents an embodiment of the present invention, and FIG. 1 is a cross-sectional plan view of an elastomer joint. Figure 2 is a cross-sectional plan view of the stud alone. FIG. 3 is a bottom view of the stud. Explanation of symbols, 1...Elastomer joint. 2...
socket. 6...Opening. 7...Bearing. 9...
...Studded shaft center member. 10... Stud. 11...
...Shaft part. 12...Center of the head. 13...Rubber layer. 1
7...Groove. 18... Concavity. 19...Lubricating oil.

Claims (1)

[Scope of utility model registration request] A stud 10 having a head 16 with a rubber layer 13 integrally connected to the outer periphery of a head center 12 of a stud shaft center member 9, and a resin bearing 7 that slidably supports the stud head 16. , holds the bearing 7 from the outer periphery and the stud 1
In the elastomer joint 1, the rubber layer 13 is not provided on the outer periphery of the stud head 16 on the side opposite to the socket opening 6. A recessed portion 18 is provided, a lubricating oil 19 is sealed in the recessed portion 18, and the rubber layer 13 is
An elastomer joint characterized in that a groove 17 communicating with the recess 18 is formed on the outer periphery of the elastomer joint.