JPH053629U - Ball joint - Google Patents

Abstract

(57) [Abstract] [Purpose] Providing a ball joint that has high durability against load in the axial direction of the ball stud, load in the vertical direction of the ball stud axis, and vibration of the ball joint, and can be used for a long period of time. To do. [Structure] The bearing comprises a first bearing made of a low elastic member on the small opening side of the housing, and a second bearing made of a high elastic member on the opposite small opening side of the housing in the axial direction of the ball stud.
A bearing is disposed, an end of the first bearing on the second bearing side extends along the ball head toward the anti-small opening side from the equator line of the ball head, and an end of the second bearing on the first bearing side is It extends along the outer peripheral wall surface of the first bearing toward the opening side from the equator line of the ball head.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ball joint used in, for example, a suspension system and a steering system of an automobile, and more particularly to a ball joint having a bearing divided in the axial direction of a ball stud.

[0002]

[Prior Art]

 Conventionally, a ball joint 101 having bearings 105 and 106 divided in the axial direction of the ball stud as shown in FIG. 2 is disclosed in Japanese Utility Model Laid-Open No. 57-203136 and Japanese Patent Laid-Open No. 62-270815. Has been done.

[0003]

[Problems to be solved by the device]

 In the ball joint 101 as described above, the first bearing 105 made of a low-elasticity member is arranged on the small opening 111 side of the housing 107, and the second bearing 106 made of a high-elasticity member is arranged on the opposite small opening 112 side of the housing 107. The first bearing 105 receives the pulling load against the ball stud pulling load in the stud axis direction, and the second bearing 106 elastically presses the ball head 104 of the ball stud 102. Therefore, since the first bearing 105 that receives the pulling load is made of a low-elasticity member, when the first bearing 105 receives a load in the ball stud pulling direction, the ball stud 102 does not move more than necessary in the axial direction, and Since the first bearing 105 has high wear resistance, it has excellent durability. Further, since the second bearing 106 is made of a highly elastic member, the vibration applied to the ball joint 101 is absorbed.

On the other hand, when a load in the direction perpendicular to the ball stud axis is applied to the ball joint 101, the first bearing 105 interposed between the ball stud 102 and the housing 107, in particular, the ball head 104 equator of the ball stud 102. There is a problem that a crack occurs near the equator line X ′ of the first bearing 105 which faces the line X ′ and has a large load.

An object of the present invention is to provide a ball joint which has high durability against a pulling load in the axial direction of the ball stud and a load in the vertical direction of the ball stud axis and which can be used for a long period of time. .

[0006]

[Means for solving the problem]

 The present invention has the following configuration.

The bearing has a first bearing made of a low elastic member on the small opening side of the housing, and a second bearing made of a high elastic member on the opposite small opening side of the housing in the axial direction of the ball stud. The second bearing side end of is extended from the equatorial line of the ball head to the side opposite to the small opening side along the ball head, and the first bearing side end of the second bearing is moved along the outer peripheral wall of the first bearing. Extend from the equator line of the ball head to the opening side.

[0008]

【Example】

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

FIG. 1 represents an assembled ball joint 1. In the figure, 2 is a ball stud composed of a handle 3 and a ball head 4, 7 is a substantially cylindrical housing, 13 is a closing plate, 5 is a first bearing arranged on the side of the small opening 11 of the housing 7, and 6 is The second bearing is arranged on the side of the housing 7 opposite to the small opening 12 in the axial direction of the ball stud.

A ball head 4 at one end of the ball stud 2 is swingably and rotatably supported in a housing 7 through a first bearing 5 and a second bearing 6, and a shaft portion 3 at the other end is a housing 7. Of the small opening 11. A closing plate 13 is fitted into the opening of the housing 7 on the side opposite to the small opening 12 and fixed by caulking.

The first bearing 5 is made of a low-elasticity material, for example, polyamide resin, and has a shoulder portion 5b whose outer periphery fits the inner peripheral wall of the opening shoulder portion 7a of the housing 7, and a continuous small opening formed from the shoulder portion 5b. 12 and a cylindrical portion 5c extending toward the side. The shoulder portion 5b has a wedge shape in which the wall thickness increases from the inner diameter side to the outer diameter side of the housing 7, and the maximum wall thickness portion is connected to the cylindrical portion 5c. The inner spherical surface of the first bearing 5 is in sliding contact with the surface of the ball head 4 of the ball stud 2. The first bearing 5 made of the low elastic member prevents the ball stud 2 from moving unnecessarily in the axial direction when the first bearing 5 receives a load in the ball stud drawing direction.

The second bearing 6 is made of a highly elastic member such as polyurethane resin, and has a hemispherical cup-shaped bearing portion 6c, and a substantially cylindrical outer peripheral wall portion 6d that is continuously provided so as to surround the outer periphery of the bearing portion 6c. An outer peripheral extended portion 6b is continuously provided from the outer peripheral wall portion 6d and extends toward the small opening 11 side. The outer circumferences of the outer peripheral wall portion 6d and the outer peripheral extension portion 6b are matched with the inner peripheral wall of the cylindrical portion 7b of the housing 7. The bearing portion 6c of the second bearing 6 is in sliding contact with the surface of the ball head 4 of the ball stud 2, and the inner peripheral wall of the outer peripheral extension 6b is in contact with the outer peripheral wall of the cylindrical portion 5c of the first bearing 5. The vibration applied to the ball joint 1 is absorbed by the second bearing 6 made of this highly elastic member.

Next, the assembly of the ball joint 1 as described above will be described.

First, the first bearing 5 is press-fitted from the opening of the housing 7 on the side opposite the small opening 12 so that the shoulder portion 5b fits into the inner peripheral wall of the opening shoulder portion 7a of the housing 7. Next, the ball stud 2 is inserted so that the surface of the ball head 4 of the ball stud 2 is in sliding contact with the inner spherical surface of the first bear ring 5 and the handle 3 projects from the small opening 11 of the housing 7. Further, the surface of the ball head 4 of the ball stud 2 is in sliding contact with the bearing portion 6c, and the second bearing 6 is press-fitted so that the inner peripheral wall of the outer peripheral extended portion 6b contacts the outer peripheral wall of the cylindrical portion 5c of the first bearing 5. To do. Finally, the closing plate 13 is fitted into the opening of the housing 7 on the side opposite to the small opening 12 and caulked and fixed to complete. In this state, the second bearing side end portion 5a of the first bearing 5 is extended along the ball head 4 from the equator line X of the ball head 4 to the side of the anti-small opening 12 side, and The one bearing side end portion 6a extends along the outer peripheral wall surface of the first bearing 5 toward the small opening portion 11 side from the equator line X of the ball head 4.

Therefore, since the second bearing 6 made of a highly elastic member is arranged near the equator line X of the ball head 4 on the outer peripheral side of the first bearing 5 made of a low elastic member, the ball stud axis vertical The second bearing 6 gives an elastic force to the first bearing 5 in the vicinity of the equator line X where the load is large with respect to the load in the direction.

[0016]

【effect】

 The bearing has a first bearing made of a low elastic member on the small opening side of the housing and a second bearing made of a high elastic member on the opposite small opening side, and the end of the first bearing on the second bearing side is a ball head. Is extended from the equatorial line of the ball head to the side opposite to the small opening side, and the end of the second bearing on the first bearing side is along the outer peripheral wall surface of the first bearing at the small opening side of the equatorial line of the ball head. Since it is extended to the ball stud, it is possible to receive the load without excessive movement of the ball stud with respect to the load in the axial direction of the ball stud, and the second elastic member made of a highly elastic member against the vibration applied to the ball joint. The bearing can absorb the vibration. Also, the load is applied most near the equatorial line of the ball head with respect to the load in the direction perpendicular to the ball stud axis, but near the equator line, the second bearing made of a highly elastic member is located on the outer peripheral side of the first bearing made of a low elastic member. Since it is arranged, cracks do not occur near the ball head equator line of the ball stud of the first bearing.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view showing a ball joint according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view showing a conventional ball joint.

[Explanation of symbols]

 2 ball stud 3 handle 4 ball head 5 first bearing 5a second bearing side end 6 second bearing 6a first bearing side end 7 housing 11 small opening 12 anti-small opening X equatorial line

Claims (1)

[Claims for utility model registration] [Claim 1] One end of the ball stud (2) has a spherical head portion (4) and a housing (7) with bearings (5) and (6) divided in the axial direction of the ball stud. In the ball joint, which is swingably and rotatably supported therein, and in which the other end handle portion (3) of the ball stud (2) projects from the small opening (11) of the housing (7), the bearing (5), (6) is a small opening (1) of the housing (7)
A first bearing (5) made of a low-elasticity member is arranged on the side 1), and a second bearing (6) made of a high-elasticity member is arranged on the side of the housing (7) opposite to the small opening (12) in the axial direction of the ball stud. , The second bearing side end portion (5a) of the first bearing (5) is located along the ball head (4) toward the anti-small opening (12) side from the equator line (X) of the ball head (4). The first bearing side end portion (6a) of the second bearing (6) is extended along the outer peripheral wall of the first bearing (5) and has a smaller opening than the equator line (X) of the ball head (4) ( 11) A ball joint which is extended to the side.