JPH0645100Y2 - Dust seal element for sliding bushes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a dust seal element for a sliding bush used in an automobile suspension or the like.

(Prior Art) As a prior art example of this type of sliding type bush, there is one shown in FIG. 4 (see Japanese Patent Application No. 62-70496). This bush is disposed between the fixed side member 1 and the movement side member 2 which performs thrust direction movement, rocking and rotational movement relative to the fixed side member 1, and the fixed side member 1 and the movement side member 2. It consists of an annular dust seal element 3 provided at the end of the bush. Here, the bush used for practical use is
The dust seals are used by being configured so that the dust seals are arranged on both sides of the bush by abutting the left and right objects in pairs as shown in FIG.

The fixed-side member 1 includes an outer cylinder 4 that is connected to the vehicle body side, a sliding member 5 that slides with respect to the exercise-side member 2, and a middle cylinder 6 that is fitted on the outer periphery of the sliding member 5. This middle cylinder 6 and outer cylinder 4
And an elastic member 7 that acts as a buffer between them. On the other hand, the motion side member 2 abuts against the inner cylinder 8 for fixing the bush to a mounting bracket (not shown) of the suspension with bolts and the like, and prevents the movement in the thrust direction by abutting against the end surface of the sliding member 5. It is composed of a flange portion 8a.

Although the outer cylinder side has been described as the fixed side member 1 for fixing to the vehicle body and the inner cylinder side has been described as the movement side member 2 for fixing to the suspension, the outer cylinder side may be referred to as the movement side member and the inner cylinder side depending on the mode of use. Needless to say, may be the fixed side member.

As shown in FIG. 5, the dust seal element 3 includes a fitting portion 9 fitted to the stationary member 1, a seal lip portion 10 slidingly contacting the moving member 2, and a stationary member 1. And a flexible portion (11) for absorbing relative movement generated between the movement side member (2) and

According to the dust seal element having the above-described configuration, the dust seal element 3 responds to the relative movement (thrust direction movement, swinging, and rotational movement) between the fixed-side member 1 and the moving-side member 2 to cause dust and dirty water in the bush. It is possible to prevent the intrusion of the grease and the outflow of the grease provided in the grease gaps A and B formed between the fixed side member 1 and the movement side member 2.

(Problems to be Solved by the Invention) In the sliding type bush having such a structure, the surface of the inner cylinder 8 located outside the seal lip portion 10 may be exposed to air and dirty water to cause rust R. Since the seal lip portion 10 is not axially restrained with respect to the inner cylinder, if the inner cylinder 8 provided on the motion side member 2 moves in the thrust direction by the grease gap A, the seal lip portion 10
The lip tip portion 10a of the above slides relatively on the inner cylinder surface and rides on the rusted portion R.
The damage is accelerated and the long-term seal life cannot be expected.

Therefore, in order to solve the above-mentioned problems, the present invention does not ride on rust or the like generated on the surface of the motion side member even if the motion side member moves relative to the fixed side member, and provides a good seal for a long period of time. It is an object of the present invention to provide a dust seal element that maintains its properties.

(Means for Solving the Problems) In order to achieve this object, the present invention has a fixed side member and a flange portion in a sliding type bush, and has a thrust direction relative to the fixed side member. A dust seal element disposed between a motion side member that performs a motion, a swing, and a rotation motion, and a fitting portion to be fitted to the fixed side member and a sliding contact with the motion side member. A seal lip portion, and a flexible portion which is disposed between the fitting portion and the seal lip portion and absorbs relative motion generated between the both members, and an outer peripheral surface of a connection region of the flange portion, A holding member having a contact surface with both the flange surface of the flange portion and having a required hardness and a low friction coefficient, the holding member including the flexible portion and the seal lid both made of a rubber-like elastic body. It is characterized in that the cap portion is integrally connected.

(Operation) According to the above-described configuration, the seal lip portion is moved in accordance with the thrust (axial line) direction movement of the movement-side member by having the structure in which the axial end surface of the flange portion and the holding member are in contact with each other. As a result, the seal lip portion does not ride on the rust portion generated on the motion side member, and the holding member has a structure in which the outer peripheral surface of the connection region of the flange portion comes into contact with the seal member. The lip is positioned in the radial direction to ensure a consistent sealing function. Furthermore, the contact surface of the holding member has a low coefficient of friction, so the holding member can rotate on the outer peripheral surface of the connection area. Eggplant

(Embodiment) An embodiment of a dust seal element for a sliding bush according to the present invention will be described in detail below with reference to the drawings.

1 to 3 are partially enlarged cross-sectional views showing the dust seal element side of the sliding bush. In FIGS. 1 to 3, the same components as those of the sliding type bush shown in FIG. 4 are designated by the same reference numerals, and the duplicated description will be omitted.

FIG. 1 is a view showing a first embodiment of a dust seal element according to the present invention. The dust seal element 3 is a fitting portion fitted to the inner surface of a middle cylinder 6 which is a component of the stationary member 1. 9, a seal lip portion 10 that makes sliding contact with the outer surface of the inner cylinder 8 that forms one component of the movement-side member 2, and is disposed between the fitting portion 9 and the seal lip portion 10 and between both members. A flexible portion (11) that absorbs the relative movement that occurs and a holding member (20) that integrally connects the flexible portion (11) and the seal lip portion (10) are provided.

The above-mentioned fitting portion 9 is provided with an outer peripheral ring 12,
The outer ring 12 urges the fitting portion 9 in the radial direction,
The dust seal element is fixed to the middle cylinder 6. Outer ring 12
Is provided with a flexible portion 11 protruding inward in the radial direction. The flexible portion 11 is made of a rubber-like elastic body and is provided along the inner surface of the outer peripheral ring 12. The seal lip portion 10 described above is made of a rubber-like elastic body. The seal lip portion 10 is formed in a bifurcated shape in cross section and has a seal tip portion 10a that achieves a sealing function by contacting along the outer peripheral surface of the inner cylinder 8.

The holding member 20 provided between the flexible portion 11 and the seal lip portion 10 described above cooperates with the flange 8a to position the seal lip portion 10. To connect the flange 8a,
The inner cylinder 8 is provided with a connection portion 21 that is wider than the flange portion 8a. The connecting portion 21 is arranged close to the seal lip portion 10 and has a step portion 22 that cooperates with the flange portion 8a on the dust seal element 3 side. This step
The holding member 20 is formed in a stepped shape so as to simultaneously contact the outer peripheral surface 22a formed on the flange 22, the flange surface 23 formed on the flange portion 8a, and the support surface 24 formed on the connecting portion 21. . Therefore, the holding member 20 includes a holding portion 25 that holds the seal lip portion 10 at a predetermined height, and a fitting portion 26 that has a diameter increased to fit with the step portion 22. This mating part 26
Is attached to the step portion 22 so as to come into contact with the outer peripheral surface 22a formed in the connection region of the flange portion 8a and the flange surface 23 of the flange 8a, the seal lip portion 10 provided on the holding member 20 has an inner cylinder. A predetermined height from the outer peripheral surface of 8 is maintained, and it is held in the radial direction and the axial direction. Therefore, the above-mentioned holding member 20 needs to have a predetermined hardness. Further, since the dust seal element 3 needs to be configured to be rotatable within the sliding bush, the contact surface between the holding member 29 and the outer peripheral surface 22a, the flange surface 23, and the support surface 24 has no friction. Is desirable. Therefore, it is most preferable that the holding member 20 is formed of, for example, 6-nylon, which is surface-treated so as to have a low friction coefficient.

Next, a second embodiment of the dust seal element according to the present invention will be described with reference to FIG. In this example,
Although it has almost the same configuration as the embodiment shown in FIG. 1,
Since the structure of the holding member is different, this part will be described. The holding member 30 includes a flexible portion 9 made of a rubber-like elastic body.
And a first member 31 provided for integrally connecting the seal lip portion 10, an outer peripheral surface 22a of a connection region of the flange portion and a flange surface 2 of the flange portion by fitting with the first member 31.
The second member 32 is in contact with 3. The first member 31 has a linear cross section and is formed in an annular shape. The second member 32 has a first shape.
It has an L-shaped cross section for fitting with the end of the member 31. Further, since it is desirable that the surface of the second member 32 that contacts the outer peripheral surface 22a and the flange surface 23 has no friction, the surface is processed to have a low coefficient of friction on this surface. As described above, by configuring the holding member 30 with two members, for example, the first member 31 is made of a metal material having excellent adhesiveness between the flexible portion 11 and the lip portion 10, and the second member 32 is provided.
Can be made into a resin material having a low friction coefficient, and an effect that various materials having practically necessary characteristics can be easily selected can be obtained.

Next, a third embodiment of the dust seal element according to the present invention will be described with reference to FIG. It should be noted that description of portions having the same configuration as the portions shown in FIG. 1 will be omitted. In this embodiment, as shown in FIGS. 1 and 2, the wide connecting portion 21
The flange portion 8a is provided directly on the inner cylinder 8 without forming.
Therefore, in FIGS. 1 and 2, the outer peripheral surface 22a formed on the connecting portion 21 coincides with the outer peripheral surface of the inner cylinder 8 in this embodiment, and accordingly, the structure of the holding member also changes. change. The holding member 40 is formed in an annular shape having an L-shaped cross section so that one end thereof protrudes inward, so that the flange portion is formed.
Flange surface 23 of 8a and outer peripheral surface of connection area of flange portion 8a
Abuts 22a. As a result, the positioning of the seal lip portion 10 in the radial direction and the axial direction is ensured. Also, the holding member
In 40, it is desirable that the portion that contacts the flange surface 23 and the outer peripheral surface 22a be formed to have a low coefficient of friction. By having the structure as described above, the contact surface between the inner cylinder 8 and the holding member 40 is only the two surfaces of the flange surface 23 and the outer collecting surface 22a, and the machining surface is small at the time of manufacturing the inner cylinder 8 and the machining cost is reduced. The effect that can be reduced is obtained.

As shown in FIGS. 1 to 3, the holding members 20, 30, 40 are arranged such that, in engagement of the flange surface 23 of the flange portion 8a and the outer peripheral surface 22a of the connection area of the flange portion 8a, the radial direction of the seal lip portion 10 is increased. And because it ensures positioning in the axial direction,
Most preferably, the outer peripheral surface 22a is formed in the axial direction and the flange surface 23 is formed perpendicular to the axial direction.

It is needless to say that the present invention is not limited to the above embodiment and various modifications can be added.

(Effects of the Invention) As described above, the dust seal element for a sliding type bush according to the present invention has contact surfaces for both the outer peripheral surface of the connection area of the flange portion and the flange surface of the flange portion. By providing a holding member having a hardness and a low coefficient of friction, the flexible member and the seal lip portion, both of which are made of a rubber-like elastic body, are integrally connected to the holding member. Even if it moves relative to the fixed side member in the axial direction, it does not ride on the rust etc. generated on the surface of the moving side member and the seal lip can be reliably positioned in the radial direction, so it can be used for a long period of time. Good sealability can be maintained, and in addition, the contact surface between the holding member and the outer peripheral surface and the flange surface has a low coefficient of friction. Has an excellent effect that the sealing property of the seal lip portion is not adversely affected when moving.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view showing a first embodiment of a dust seal element according to the present invention assembled to a sliding bush, and FIG. 2 is a partially enlarged view showing a second embodiment of the dust seal element according to the present invention. Sectional view, FIG. 3 is a partially enlarged sectional view showing a third embodiment of the dust seal element according to the present invention, FIG. 4 is a sectional view showing a conventional sliding bush, and FIG. 5 is a dust seal used in FIG. It is an expanded sectional view of an element. 1 ... Fixed side member, 2 ... Movement side member 3 ... Dust seal element, 8a ... Flange part 9 ... Fitting part, 10 ... Seal lip part 11 ... Flexible part, 20, 30, 40 ... Holding member 22 ... Outer peripheral surface, 23 ... Flange surface

Claims (1)

[Scope of utility model registration request] 1. A fixed member in a sliding bush,
A dust seal element, which has a flange portion and is disposed between a stationary member and a moving member that performs thrust direction movement, swinging, and rotary movement relative to the fixed side member,
A fitting portion to be fitted to the fixed member, a seal lip portion to be brought into sliding contact with the movement member, and a seal lip portion disposed between the fitting portion and the seal lip portion, and a relative position between the members. A flexible portion that absorbs movement, having a contact surface for both the outer peripheral surface of the connection region of the flange portion and the flange surface of the flange portion, and having the required hardness and low friction coefficient. A dust seal element comprising a holding member, wherein the flexible portion and the seal lip portion, both of which are made of a rubber-like elastic body, are integrally coupled to the holding member.