JPH0522832U - Anti-vibration structure of ball joint - Google Patents

Abstract

(57) [Abstract] [Purpose] For example, a ball joint used for connecting a tie rod and an arm member of a steering device for an automobile is provided with a vibration damping function. [Structure] A cylindrical portion 51 is provided at an end of a tie rod 5, and an outer peripheral surface of a bush 6 made of an elastic material such as rubber is bonded and fixed to an inner peripheral surface of the cylindrical portion 51 so that the inner peripheral surface of the bush 6 is fixed. The ball joint 1 is bonded and fixed to the outer peripheral surface of the socket 2, and the ball stud 4 of the ball joint 1 is fastened and fixed with the arm member 7 by the nut 8. The vibration input from either the tie rod 5 or the arm member 7 is applied. The bush 6 absorbs the vibration and reduces the vibration transmission to the other side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ball joint used, for example, for connecting a tie rod and an arm member of a steering device for an automobile.

[0002]

[Prior Art]

 In a steering apparatus of an automobile, a ball joint is generally used to connect a tie rod and a gear arm or a tie rod and a knuckle arm.

[0003]

[Problems to be solved by the device]

 The ball joint is basically composed of a socket, a ball seat fitted in the inner cavity of the socket, and a ball stud having a spherical portion fitted and held in the ball seat at one end. Has a structure in which a socket is integrally fixed to one end of a tie rod, and an arm member such as a gear arm or a knuckle arm is fixed to a ball stud. Therefore, the vibration input from the steering wheel (front wheel) is It has problems such as being transmitted to each part, deteriorating the steering feeling, and adversely affecting each part of the steering system.

The present invention mainly aims to address the above-mentioned conventional problems.

[0005]

[Means for Solving the Problems]

 The present invention is characterized in that a bush made of an elastic material such as rubber is interposed between a socket of a ball joint and a member attached thereto or between a ball stud and a member attached thereto. Thus, the vibration input from one member is absorbed by the bush, and the vibration transmission to the other member can be greatly reduced.

[0006]

【Example】

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

FIG. 1 shows a first embodiment of the present invention, in which 1 is a ball joint, and the ball joint 1 is a socket 2 and a synthetic resin ball fitted in the socket 2. The seat 3 and the ball stud 4 having the spherical portion 41 fitted and held in the ball seat 3 at one end thereof.

Reference numeral 5 is a tie rod, and a tubular portion 51 is provided at an end of the tie rod 5. The cylindrical portion 51 has an inner diameter larger than the outer diameter of the socket 2 by a predetermined dimension so as to surround the outer periphery of the socket 2 at a predetermined interval. The inner periphery of the cylindrical portion 51 and the outer periphery of the socket 2 are A bush 6 made of an elastic material such as rubber is interposed between the two.

An outer peripheral surface of the bush 6 is bonded and fixed to an inner peripheral surface of the tubular portion 51, and an inner peripheral surface of the bush 6 is bonded and fixed to an outer peripheral surface of the socket 2.

The taper shaft portion 42 of the ball stud 4 is fitted into a taper hole 71 provided in the arm member 7 such as a gear arm or a knuckle arm, and the nut 8 is screwed into the screw shaft portion 43 to tighten the ball stud 4 Is fastened to the arm member 7.

In the above description, since the steering force is transmitted from one of the tie rod 5 and the arm member 7 to the other in a plane substantially parallel to the rotating surface of the arm member 7, the steering force is transmitted. The force mainly acts on the bush 6 in the direction of compressive deformation. Further, the bush 6 is elastically deformed in the shearing direction with respect to the relative movement of the arm member 7 in the direction orthogonal to the rotating surface.

Generally, the spring constant of the bush is much larger in the compression direction than in the shearing direction, so that the compression deformation of the bush 6 during steering is small, which may cause a problem in steering responsiveness. rare. On the other hand, the vibration component in the direction orthogonal to the rotating surface of the arm member 7 of the vibration during traveling is absorbed by the elastic deformation of the bush 6 in the shearing direction, and the vibration load can be largely reduced as a whole.

FIG. 2 shows a second embodiment of the present invention, and shows an example in which a bush 6 made of an elastic material such as rubber is interposed at a joint between the ball stud 4 and the arm member 7.

That is, in the second embodiment, in the ball joint 1 including the socket 2, the ball seat 3, and the ball stud 4, the tie rod 5 is directly fixed to the socket 2 and the taper shaft portion 42 of the ball stud 4 is attached. The inner cylinder 9 is fitted and fixed with a nut 8. The inner peripheral surface of the bush 6 is bonded and fixed to the outer peripheral surface of the inner cylinder 9, and the inner peripheral surface of the outer cylinder 10 is bonded and fixed to the outer peripheral surface of the bush 6. Then, the outer cylinder 10 is press-fitted into a mounting hole 72 provided in the arm member 7, and is fixed by means such as welding or caulking if necessary.

In the second embodiment, the bush 6 is provided between the socket 2 and the tie rod 5 in the first embodiment, whereas the bush 6 is provided between the ball stud 4 and the arm member 7. The operation and effect are exactly the same as in the first embodiment.

In the first and second embodiments described above, the present invention is applied to a ball joint used for connecting a tie rod and an arm member of a steering device for an automobile. The present invention can be applied to all ball joints that require anti-vibration, and the structure of the ball joint itself is not limited to the illustrated embodiment and can be applied to any conventionally known ball joint structure.

[0017]

[Effect of the device]

 As described above, according to the present invention, a ball joint having an anti-vibration function can be provided by an extremely simple measure, which can bring a great effect in practical use.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 ball joint 2 socket 3 ball seat 4 ball stud 5 tie rod 6 bush 7 arm member

Claims (1)

[Scope of utility model registration request] 1. A ball joint comprising a socket, a ball seat fitted in an inner cavity of the socket, and a ball stud having a spherical portion fitted and held in the ball seat at one end. A bushing made of an elastic material such as rubber is interposed between the socket and a member attached to the socket or between the ball stud and a member attached to the ball stud. Swing structure.