KR20170098007A

KR20170098007A - ball joint

Info

Publication number: KR20170098007A
Application number: KR1020160019841A
Authority: KR
Inventors: 장석모
Original assignee: 주식회사 만도
Priority date: 2016-02-19
Filing date: 2016-02-19
Publication date: 2017-08-29

Abstract

According to an embodiment of the present invention, there is provided a display device including: a housing having a space portion opened in one direction and having an injection gate communicated with the space portion; A ball stud having a ball inserted into the space; And a ball seat injected between the space portion and the ball stud through the injection gate.

Description

Ball joint

The present invention relates to a ball joint and a manufacturing method thereof, and more particularly to a ball joint for a vehicle.

In general, ball joints are mechanical elements that connect the parts and parts in three-dimensional relative rotation, and are used in steering or suspension systems of automobiles.

For example, the ball joint performs a function to smooth the relative motion between the front and rear ends of the upper and lower arms, which are coupled to both ends of the vehicle body frame in the suspension system of the vehicle, and between the front and rear ends of the knuckle .

1, a conventional ball joint includes a ball stud 40 having a ball at a lower portion thereof, a ball stud 40 having a space formed therein at an inner side thereof to smoothly rotate the ball stud 40 while surrounding the ball, A housing 10 disposed on the outside of the ball seat 20, a dust cover 50 fixedly coupled to the outside of the housing 10, And a cap 30 coupled to the opening.

Such a ball joint injects the viscous fluid into the lower end portion of the ball seat 20 after press-fitting the ball seat 20 into the inside of the housing 10.

Then, the ball of the ball stud 40 is seated on the inside of the ball seat 20, and the dust cover 50 is engaged with the housing 10 and the ball stud 40 so as to be linked.

At this time, the viscous fluid is filled in the space formed by the dust cover 50 and the housing 10 so that the ball stud 40 can be rotated and tilted smoothly, and then the assembly is completed.

However, in such a general ball joint, after the ball seat 20 is inserted, the ball stud 40 is supported by the swaging. Since the internal stress is generated in the ball seat 20 after the swaging, There is a problem in that the flow torque or the rotation torque of the first and second clutches 40, 40 may become large.

Korean Patent Publication No. 10-2003-0000057

The present invention provides a ball joint in which a manufacturing process is simplified and a manufacturing cost is reduced by inserting a ball seat into a housing, and a method of manufacturing the ball joint.

In addition, the present invention provides a ball joint and a method of manufacturing the ball joint that minimize the internal stress of the ball seat to reduce the flow torque or the rotational torque of the ball stud.

The objects of the present invention are not limited to those described above, and other objects and advantages of the present invention which are not mentioned can be understood by the following description.

According to an embodiment of the present invention, there is provided a ball joint comprising: a housing formed with a space portion opened in one direction and having an injection gate communicated with the space portion; A ball stud having a ball inserted into the space; And a ball sheet injected between the space portion and the ball stud through the injection gate.

In one embodiment, the space portion may include at least one or more release preventing grooves.

In one embodiment, the ball of the ball stud may comprise a pocket.

In one embodiment, the cap may further include a cap disposed on a bottom surface of the space around the pocket.

In one embodiment, the cap may be ring-shaped.

In one embodiment, the cap may be made of a plastic material.

According to the embodiment of the present invention, by inserting the ball sheet into the housing, the manufacturing process can be simplified and the manufacturing cost can be reduced.

Further, according to the embodiment of the present invention, by injecting the ball seat into the housing, the occurrence of internal stress of the ball seat can be minimized, and the flow torque or the rotation torque of the ball stud can be reduced.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a cross-sectional view showing a conventional ball joint.
2 is a cross-sectional view illustrating a ball joint according to an embodiment of the present invention.
3 is a cross-sectional view showing a part of a ball joint according to an embodiment of the present invention before the ball seat is injection-molded.
4 is a perspective view showing a housing of a ball joint according to an embodiment of the present invention from a bottom side.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a cross-sectional view showing a ball joint according to an embodiment of the present invention, FIG. 3 is a cross-sectional view showing a part of a ball joint according to an embodiment of the present invention before a ball seat is injection- 1 is a perspective view showing a housing of a ball joint according to an embodiment of the present invention from a bottom side;

2 to 4, a ball joint 100 according to an embodiment of the present invention includes a front end portion of an upper or lower arm coupled to both ends of a vehicle body frame in a suspension of an automobile, Can be connected.

The ball joint according to one embodiment includes a housing 110, a ball stud 130, a ball seat 120, and a cap 140.

The housing 110 has a substantially hemispherical space 111 corresponding to the ball 131 of the ball stud 130. The housing 110 may be formed of a metal material to maintain the strength of the ball stud 130 seated in the space 111. The space portion 111 can be opened at one side, for example, upward in the drawing. The space portion 111 may have a release preventing groove 113 for preventing the ball seat 120 from coming off. That is, at least one or more release preventing grooves 113 are formed around the inner surface of the space portion 111 so that the ball seat 120 is firmly coupled to the housing 110 during injection molding of the ball seat 120. At least one injection gate 112 is formed in the housing 110 so as to communicate with the space portion 111. Four injection gates 112 may be formed radially around the cap 140.

The ball stud 130 has a ball 131 which is inserted at one end thereof into the space portion 111 of the housing 110 to be able to flow. The ball 131 may be substantially hemispherical, and the ball is formed with a pocket 131a concaved in the direction of the center of the ball so that a predetermined amount of viscous fluid, for example, grease is received.

The ball seat 120 is provided on the inner side of the space portion 111 of the housing 110. That is, the ball seat 120 is a synthetic resin introduced into the space portion 111 through the injection gate 112 of the housing 110, and is formed between the space portion 111 and the ball. The ball seat 120 may have a coupling protrusion formed by the release preventing groove 113 of the space portion 111 during injection molding.

The cap 140 may be disposed on the bottom surface of the space portion 111 around the pocket 131a. The cap 140 may be formed in a ring shape so as not to block the entrance of the pocket 131a. The cap 140 may be made of a plastic material, but is not limited thereto.

The ball joint according to one embodiment may further include a dust cover (not shown) coupled with a fastening jaw formed at the upper end of the ball seat 120. Both ends of the dust cover are installed in close contact with the housing 110 and the ball stud 130 to prevent foreign matter from penetrating between the housing 110 and the ball stud 130. The dust cover may be formed of a flexible rubber material to perform a smooth rotation action and a tilting action of the ball stud 130.

Such a ball joint can be manufactured through the following process.

For example, the ball joint according to one embodiment includes the steps of preparing the housing 110; Forming an injection gate (112) in the housing (110); Seating the ball stud (130) in the space (111); And fabricating the ball seat 120 through the injection gate 112.

In preparing the housing 110, the housing 110 may have a space portion 111 to receive a ball of the ball stud 130, and at least one The separation preventing grooves 113 can be formed.

In the step of forming the injection gate 112, a plurality of injection gates 112 may be formed to communicate with the space portion 111.

The step of seating the ball stud 130 may include the step of receiving a ball of the ball stud 130 in the space 111 of the housing 110 such that the ball of the ball stud 130 receives the viscous fluid 131a may be formed.

In the step of manufacturing the ball seat 120, the liquid synthetic resin is injected between the space 111 and the ball of the ball stud 130 to inject and form the ball seat 120. Since the viscous fluid is received in the ball of the ball stud 130, the ball stud 130 is disposed so that the pocket 131a opens upward, and the housing 110 is also positioned above the ball stud 130 The injection process can be carried out. In addition, the ring-shaped cap 140 may be disposed on the bottom surface of the space 111 in the vicinity of the pocket 131a so that the synthetic resin does not flow into the pocket 131a.

As described above, according to the embodiment of the present invention, the ball seat 120 is insert-injected into the housing 110, the manufacturing process can be simplified and the manufacturing cost can be reduced, and the occurrence of the internal stress of the ball seat 120 can be minimized So that the flow torque or the rotation torque of the ball stud 130 can be reduced.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be.

That is, it should be understood that the embodiments described above are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

Accordingly, the scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100; Ball joint
110; A housing 111; Space portion
112; An injection gate 113; Release prevention groove
120; Ball seat
130; Ball stud 131; ball
131a; pocket
140; cap

Claims

A housing formed with a space portion opened in one direction and having an injection gate communicated with the space portion;
A ball stud having a ball inserted into the space;
A ball seat formed between the space portion and the ball stud through the injection gate;
.

The method according to claim 1,
Wherein the space portion has at least one or more release preventing grooves.

The method according to claim 1,
Wherein the ball of the ball stud has a pocket.

The method of claim 3,
And a cap disposed on a bottom surface of the space portion around the pocket.

5. The method of claim 4,
Wherein the cap has a ring shape.

5. The method of claim 4,
Wherein the cap is made of a plastic material.