JPH0722141U - Sliding bush - Google Patents

Abstract

(57) [Summary] [Structure] Concentrically arranged cylindrical inner and outer cylinders, and a spherical spherical head arranged between the inner cylinder and the outer cylinder in the axial center. An intermediate body having a portion, a rubber-like elastic body interposed between the intermediate body and the inner cylindrical body, a sliding body made of synthetic resin interposed between the intermediate body and the outer cylindrical body, In a sliding bush made of rubber-like seal rubber arranged on both outer sides of the moving body in the axial direction, the sliding body has a plurality of grooves inclined with respect to the axis, and the sealing rubber applies a load to the sliding body. It has a spring ring. [Effect] When the sliding body receives an axial load from the seal rubber, the sliding body can apply a load to the spherical head portion of the intermediate body in the axial direction and the radial direction due to the contracting action of the slanting groove. Therefore, even if the sliding surface of the sliding body is worn and a gap is generated between the spherical head of the intermediate body and the sliding body, the gap is closed by the axial and radial contraction of the sliding body, There is no backlash, and sufficient torque can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sliding bush used for a suspension system of an automobile.

[0002]

[Prior art]

 In automobile suspensions, bushes are often used at link portions of arms and links arranged between the wheels and the vehicle body in order to absorb vibrations transmitted from the wheels to the vehicle body. Generally, the bush is composed of an inner cylindrical body and an outer cylindrical body which are arranged concentrically with a space therebetween, and a rubber-like elastic body mounted between the inner and outer cylindrical bodies. The rubber-like elastic body is vulcanized and adhered to the inner cylinder and the outer cylinder, respectively. Then, the inner tubular body is fitted and supported by a support shaft attached to the vehicle body or the wheel side, and the outer tubular body is fixed to the other side. When such a bush is used for a suspension, the inner cylinder is usually fixed to the support shaft. By doing so, when the wheel is displaced with respect to the vehicle body, the inner cylindrical body and the outer cylindrical body of the bush are relatively displaced in the radial direction or the axial direction, and the rubber-like elastic body is elastically deformed in accordance with the relative displacement. Therefore, due to its elasticity, vibrations in various directions are absorbed.

In the bush as described above, if the rigidity of the bush in the direction perpendicular to the axis is increased in order to improve the vibration damping performance, the torsional rigidity of the inner cylinder and the outer cylinder increases, and as a result, the turning performance deteriorates. Conversely, if the rigidity of the bush in the direction perpendicular to the axis is lowered to improve the turning performance of the inner cylinder and the outer cylinder, the torsional rigidity of the inner cylinder and the outer cylinder becomes low, and as a result, the vibration isolation performance deteriorates. There is a problem.

In addition, with the recent multi-linking of suspensions of automobiles, bushes used for linking parts of links and arms are subject to various movements such as rocking, in addition to the conventional radial, circumferential or axial movements. It has become necessary for people to exercise freely with a high degree of freedom. However, the above-mentioned bush has a problem that it cannot be used in a portion requiring a high degree of freedom because of its low limit on the moving direction and the displacement amount.

As a solution to the above-mentioned problems of the bush, there is a "rocking bush".

That is, as shown in FIG. 3, a pre-assembled body in which a rubber-like elastic body 107 and an outer cylindrical body 103 are bonded to the outer circumference of a substantially cylindrical intermediate body 102, and a sliding body 108 is mounted on the inner circumference side thereof. It is interposed and mounted on an inner cylinder body 104 composed of a spherical head portion 106 and two shaft portions 105, 105, and the inner periphery of both ends of the intermediate body 102 and the shaft portion 105 of the inner cylinder body 104. Between the outer circumference of 105 and the water inside the sliding bush 101. Boots 109, 109 are attached for the purpose of preventing invasion of dust and the like. There are many sliding bushes such as those disclosed in Japanese Patent Laid-Open No. 62-191207.

[0007]

[Problems to be solved by the device]

 The sliding bush 101 has high vibration isolation performance and rotation performance, and has a degree of freedom regarding the direction of movement and the amount of displacement. However, while such a sliding bush 101 has many advantages, it slides between the ball head 106 of the inner cylindrical body 104 and the sliding body 108, so that the sliding body 108 slides due to long-term use. The surface 108a may be worn, a gap may be formed between the ball head 106 and the sliding body 108, and the sliding bush 101 as a whole may be loosened. In addition, a torque applied to the inner cylinder 104 may not provide sufficient torque.

Therefore, in order to solve the above problem, as shown in Japanese Utility Model Laid-Open No. 4-1719, for example, sliding is performed by fitting an annular push ring that abuts against one end surface of the sliding body on the outside of one end portion of the sliding body. There is a bush. In this sliding bush, for example, even if the sliding surface of the sliding body wears and a gap is created between the inner cylinder and the sliding body, the sliding body is pressed by the push ring, and the sliding body becomes the inner cylinder. A constant torque can always be applied. However, although the sliding body of this sliding bush certainly receives a load in the axial direction by the push ring, no load is applied in the radial direction. Therefore, the spherical head of the inner cylinder receives the axial load, but almost no radial load, leaving a gap between the spherical head and the sliding body, resulting in insufficient torque. Sometimes.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a sliding bush that does not cause backlash and can obtain sufficient torque.

[0010]

[Means for Solving the Problems]

 The structure of the present invention is as follows.

An intermediate body having a cylindrical inner cylinder body and an outer cylinder body that are concentrically arranged, and a spherical spherical head portion that is disposed between the inner cylinder body and the outer cylinder body and that is substantially at the center in the axial direction. A rubber-like elastic body interposed between the intermediate body and the inner cylindrical body, a synthetic resin sliding body interposed between the intermediate body and the outer cylindrical body, and both axial ends of the sliding body. In a sliding bush made of a rubber-like seal rubber arranged on the outside, the slide body has a plurality of grooves inclined with respect to the axis, and the seal rubber is provided with a spring ring for applying a load to the slide body.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional plan view showing a sliding bush according to an embodiment of the present invention. In the figure, reference numeral 4 denotes an intermediate body, which is a hollow shape composed of a spherical ball head 6 and two shaft portions 5, 5 coaxially projecting from the ball head 6. On the inner peripheral side of the intermediate body 4, a cylindrical metal-made inner cylinder body 2 is arranged concentrically with the intermediate body 4, and a rubber-like elastic body 7 is provided between the inner cylinder body 2 and the intermediate body 4. Are vulcanized and bonded together, thereby forming a bonded preassembly.

On the outer peripheral side of the intermediate body 4, a cylindrical metal outer cylindrical body 3 is concentrically arranged with the intermediate body 4, and an inner peripheral end portion of the outer cylindrical body 3 will be described later. Circular grooves 3a, 3a for mounting the outer peripheral portions of the seal rubbers 9, 9 are provided. A sliding body 8 having an inner spherical surface 8a having substantially the same curvature as the outer peripheral surface of the spherical head portion 6 of the intermediate body 4 is interposed between the outer cylindrical body 3 and the intermediate body 4. The sliding body 8 is a composite material made of a low friction material, has an extremely small coefficient of friction, and has excellent wear resistance. Further, as shown in FIG. 2, the sliding body 8 is formed with a plurality of grooves 11 which are inclined with respect to the axis thereof.

Between the outer circumferences of the shaft portions 5 and 5 of the intermediate body 4 and the inner circumferences of both end portions of the outer cylindrical body 3, a seal rubber made of a rubber material for preventing water, dust and the like from entering the sliding bush 1. 9 and 9 are installed respectively. The seal rubbers 9 and 9 have a spring ring 10 embedded in the outer periphery of which one piece projects. Then, the seal rubbers 9 and 9 are seated in the circumferential grooves 3a and 3a provided on the inner circumference of the end portion of the outer tubular body 3 with the spring ring 10, and the inner circumference portion of the seal rubbers 9 and 9 is the shaft portion of the intermediate body 4. It is attached to the outer circumference of 5, 5.

Next, a method for manufacturing the sliding bush 1 of the present invention will be described.

First, the rubber-like elastic body 7 is vulcanized and bonded between the inner cylindrical body 2 and the intermediate body 4 in advance to form a pre-assembled solid body. Next, the slide body 8 in which a plurality of grooves 11 that are inclined with respect to the axis is formed is press-fitted on the outer circumference of the preliminary assembly, and then the outer cylinder body 3 is fitted on the outer circumference of the slide body 8. Finally, the spring ring 10 embedded in the outer peripheral portions of the seal rubbers 9, 9 is seated in the circumferential grooves 3a, 3a provided in the inner periphery of the end portion of the outer tubular body 3 and mounted on the inner periphery of the outer tubular body 3. At the same time, the inner peripheral portions of the seal rubbers 9 and 9 are closely attached to the outer peripheral portions of the shaft portions 5 and 5 of the intermediate body 4 so that the seal rubbers 9 and 9 are deformed. Try to apply a load to. The sliding bush 1 is manufactured as described above.

Therefore, according to the sliding bush 1 of the present invention, the sliding body 8 has a plurality of grooves 11 that are inclined with respect to the axis, and the seal rubber 9 applies a load to the sliding body 8. Therefore, when the sliding body 8 receives a load in the axial direction from the seal rubber 9, the sliding body 8 contracts in the slanting groove 11 to cause the spherical head portion 6 of the intermediate body 4 to move in the axial direction and the radial direction. It is possible to apply a load in the direction.

[0019]

[Effect of device]

 As described above, according to the present invention, since the sliding body has a plurality of grooves that are inclined with respect to the axis and the seal rubber is provided with the spring ring that applies a load to the sliding body, When the sliding body receives a load in the axial direction, the sliding body can apply a load to the spherical head of the intermediate body in the axial direction and the radial direction due to the contracting action of the slanting groove. Even if the sliding surface of the moving body wears and a gap is generated between the spherical head of the intermediate body and the sliding body, the gap is closed due to the contraction of the sliding body in the axial direction and the radial direction, which causes backlash. Without, sufficient torque can be obtained.

[Brief description of drawings]

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

FIG. 2 is a sectional plan view showing a sliding body that is a component of a sliding bush according to an embodiment of the present invention.

FIG. 3 is a sectional plan view showing a conventional sliding bush.

[Explanation of symbols]

 2 Inner cylinder 3 Outer cylinder 4 Intermediate 6 Ball head 7 Rubber-like elastic body 8 Sliding body 9 Seal rubber 10 Spring ring 11 Groove

Claims (1)

[Scope of utility model registration request] 1. A cylindrical inner cylinder (2) and an outer cylinder (3) arranged concentrically, and an axial line arranged between the inner cylinder (2) and the outer cylinder (3). An intermediate body (4) having a spherical ball head (6) at a substantially central portion in the direction, and a rubber-like elastic body (7) interposed between the intermediate body (4) and the inner cylindrical body (2). When,
A sliding body (8) made of a synthetic resin interposed between the intermediate body (4) and the outer cylinder body (3), and a rubber-like body disposed outside both ends of the sliding body (8) in the axial direction. In a sliding bush including a seal rubber (9), the slide body (8) has a plurality of grooves (11) inclined with respect to an axis, and the seal rubber (9) with respect to the slide body (8). A sliding bush provided with a spring ring (10) for applying a load.