JPH0633260Y2 - Slip bush - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sliding bush used in a bearing portion of, for example, a vehicle suspension or a stabilizer.

[Conventional technology]

Conventionally, for example, as a suspension bush, the second
As shown in the figure, a metal outer sleeve (101) fitted to the annular portion (105) at the end of the arm (104), and the annular portion.
A metal inner sleeve (103) sliding on the outer peripheral surface of the shaft (106) penetrating the (105), and a rubber material such as chloroprene rubber or nitrile rubber adhered between the sleeves (101) and (103). A bush consisting of (102) and is used.

Further, for example, as the stabilizer bush, as shown in FIGS. 3 and 4, a rubber material (112) such as chloroprene rubber, nitrile rubber or urethane rubber fitted on the outer periphery of the stabilizer bar (114), A bush including a metal fitting (111) for fixing the rubber material (112) to the vehicle body side (113) is used.

[Problems to be solved by the device]

However, the above-mentioned conventional bushes have the following problems.

That is, the bush of FIG. 2 is slid on the shaft (106) by the metal sleeve (103), and the bushes of FIGS. 3 and 4 are the shaft, that is, the stabilizer bar.
Sliding with (114) is performed with a rubber material (112) whose friction coefficient μ is not sufficiently low (μ = 0.5 to 1.2 for chloroprene rubber and nitrile rubber, μ = 0.5 to 1.0 for urethane rubber). Moreover, in the conventional structure, the grease interposed in the sliding portion flows out due to muddy water and dust invades, so that the frictional force is large and the dust resistance is not sufficient.

In view of such a point, the present invention has an object to provide a structure having low friction and excellent dust resistance.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the sliding bush according to the present invention integrally forms a dust lip and a grease lip located axially inward of the dust lip at both axial ends of an inner peripheral surface of a bush body made of an elastic body. The bush main body is formed of a complex polymer urethane material having a low friction coefficient.

[Action]

According to the configuration of the present invention, the grease interposed between the inner peripheral surface of the bush body and the shaft is prevented from flowing out by the grease lip, and dust and muddy water from the outside are prevented from entering the inner peripheral surface of the bush body. Since it is blocked by the strip, good lubrication can be maintained.

In addition, the bush body is made of a complex polymer urethane material with a low coefficient of friction (for example, material name MEK-FG120), so that it can be lubricated with grease.
The frictional force can be significantly reduced even under dry conditions.

〔Example〕

Next, the sliding bush of the present invention will be described with reference to an embodiment shown in FIG.

(1) is a bush body made entirely of MEK-FG120 (commercial name), which is a complex polymer urethane material with a low friction coefficient, and the inner peripheral surface (1a) has a required number of grease retaining grooves ( 2) is formed, and both ends of the inner peripheral surface (1a) in the axial direction extend downward with an inclination toward the outside.
(3) is integrally formed with a grease lip (4) located on the inner side of the dust lip (3) in the axial direction and extending obliquely to the side (inner side) opposite to the inclined direction.

Further, on both end surfaces (1b) (1b) of the bush body (1), a dust seal member (5) made of a non-woven fabric of special synthetic fiber having good dust resistance is adhered, and the dust seal member (5 The inner diameter end of () is located on the axially outer side of the dust lip (3).

In the sliding bush having the above-mentioned configuration, the outer circumference of the bush body (1) is fitted to a not-shown arm or a holding portion (6) provided or attached to the machine side, and the shaft (7) is inserted into the inner circumference. . The grease that lubricates the inner peripheral surface (1a) of the bush body (1) and the outer peripheral surface of the shaft (7) is retained in the grease retaining groove (2) and is also retained by the grease lips (4) and (4). Outflow to the dust seal member (5) (5) and dust lip (3).
It is blocked by (3), and especially the outermost dust seal member (5) is made of a resin non-woven fabric with excellent dust resistance, so it can sufficiently withstand harsh environments such as muddy water and dust coming in. it can.

The MEK-FG120 complex polymer urethane material that constitutes the bush body (1) has a friction coefficient μ of 0.46 under dry conditions.
It has low friction compared to chloroprene rubber, nitrile rubber, etc. used for conventional bushes,
In addition, it has the characteristics of high temperature grease resistance and low temperature resistance.

The table below shows bushes that use conventional bushing rubber materials as sliding materials and the complex polymer urethane material MEK-FG120.
The data is shown in which the characteristics are compared using a sample of a bush (both having a simple cylindrical surface as the inner peripheral surface) using as a sliding material. In the table below, F is a load applied to the bush in the radial direction, and Ks value is a load-deflection characteristic value when the load is applied to the bush in the radial direction, that is, a static spring constant.

As is clear from this data, the bush using the MEK-FG120 complex polymer urethane material as the sliding material shows good sliding performance even under dry and high load conditions, and
The value is also high, and according to the structure of the illustrated embodiment, since grease is not washed away and dust is not invaded, a high load and a low torque can be realized, and it is suitable as a suspension bush or stabilizer bush of an automobile.

Also, the grease retaining groove (2), dust lip (3) and grease lip (4) are formed integrally with the bush body (1), so the structure does not become complicated and the space is the same as the conventional bush. It can be used in.

[Effect of device]

As described above, according to the present invention, the bush body is integrally formed with the dust lip for preventing the invasion of dust and the like and the grease lip for preventing the grease from flowing out, so that the lubrication state is maintained, the friction is low, and the dust resistance is excellent. Will be things. By making the bush body from a complex polymer urethane material having a low friction coefficient, the above effect can be further enhanced. That is, it exhibits low friction properties not only under lubrication with grease but also under dry conditions, and other high temperature resistance. A grease bushing, low temperature resistance, high load resistance, and high static spring constant are realized, and a high-performance sliding bush can be provided.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a conventional suspension bush, FIG. 3 is a front view showing a conventional stabilizer bush, and FIG.
FIG. 4 is a sectional view taken along line IV-IV in the figure. (1) …… Bush body, (1a) …… Inner peripheral surface, (1b) …… End surface (2) …… Grease retaining groove, (3) …… Dust lip (4) …… Grease lip, (5) ...... Dust seal member (6) …… Holding part, (7) …… Shaft

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-50-139255 (JP, A) JP-A-63-171762 (JP, A) JP-A-59-35724 (JP, A) Actual development Sho-63- 193161 (JP, U) Actually opened 54-112440 (JP, U) Actually opened 61-182459 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An inner peripheral surface of a bush body (1) made of an elastic body.
(1a) axially both ends of the dust lip (3) and a grease lip (4) located axially inward of the dust lip (3) are integrally formed, and the bush body (1) has a low friction coefficient. A sliding bush molded from a complex polymer urethane material.