JPH0730981Y2 - Ball joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a ball joint used for various linkage parts of an automobile.

[Conventional technology]

Conventionally, as a ball joint used for various linkage parts of an automobile, as shown in FIG.
The ball head 2a of the ball stud 2 is directly fitted and seated on the concave spherical surface portion 1b of the synthetic resin housing 1 having the concave spherical surface portion 1b which has the concave spherical surface portion 1b continuous with the opening 1a on the inner surface, and the housing 1 has a ball seat. The one with the structure that doubles as is used.

In FIG. 4, reference numeral 3 is a dust seal.

[Problems to be solved by the invention]

The ball joint using the conventional synthetic resin housing described above has a structure in which the inner concave spherical surface portion 1b of the housing 1 excluding the opening 1a serves as a bearing surface on which the ball head 2a of the ball stud 2 is fitted and seated. The reference numeral 2 is for assembling the ball head 2a by pushing it into the inner concave spherical surface portion 1b from the opening portion 1a of the housing 1.

Therefore, the diameter of the opening 1a of the housing 1 cannot be made excessively smaller than the diameter of the ball head 2a, and as a result, the holding force of the ball stud 2 against the load in the pulling direction becomes small.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a ball joint using a synthetic resin housing, in which the holding force for the load of the ball stud in the pull-out direction is enhanced.

[Means for solving problems]

According to the present invention, an object of the present invention is to provide a synthetic resin housing having an opening at the top and a concave spherical surface continuous with the opening on the inner surface, and an annular groove and a groove on the outer peripheral surface of the opening. A continuous annular step portion is formed, and a ball stud consisting of a ball head and a shaft portion integrally formed with the ball head is fitted and seated on the concave spherical surface portion of the housing, The shaft portion is arranged so as to protrude from the opening portion, a metal ring body is fitted in the annular step portion of the housing, and one end of the annular groove of the housing has an outer peripheral surface of the shaft portion of the ball stud. The other end of the dust seal fitted to the ring is fitted and the other end of the dust seal has an outer diameter larger than the inner diameter of the metal ring body fitted to the annular step in the annular groove. It is fixed by the The metal annulus is moved in the axial portion direction of the ball stud is achieved by a ball joint comprising constrained by.

[Action]

The strength of the top opening of the synthetic resin housing in the radial direction is greatly improved by the metal ring body fitted to the annular step portion of the outer peripheral surface of the opening, so that the load in the pull-out direction acting on the ball stud is greatly improved. It resists and the expansion deformation of the said opening part is prevented.

Further, the fastening clip for fixing the dust seal in the annular groove of the synthetic resin housing is formed such that the outer diameter thereof is larger than the inner diameter of the metal annular body fitted to the annular step portion of the housing, and the clip is made of the metal. Since it is arranged so as to cover the fitting portion between the ring body and the annular step portion, a gap is created between the metal ring body and the annular step portion due to the contraction due to the stress relaxation of the synthetic resin housing, and the gap between the both. Even if the degree of fitting changes, the clip functions as a stopper that prevents the metal annular body from coming out of the annular step portion, so that the above-described action is maintained.

Furthermore, the intrusion of rainwater or the like through the gap formed between the metal ring body and the annular step portion is prevented by the dust seal arranged so as to cover the gap.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 and 2 of the accompanying drawings showing an embodiment thereof.

In the figure, 10 is a synthetic resin housing, and the housing 10 has an opening 11 at the top and a concave spherical surface portion 12 continuous with the opening 11 on the inner surface.

The synthetic resin forming the housing 10 is a synthetic resin having appropriate elasticity and rigidity and having excellent self-lubricating property,
For example, polyacetal resin, polyamide resin, thermoplastic polyester resin and the like are exemplified as preferable ones.

Reference numeral 13 denotes an annular groove formed on the outer peripheral surface of the housing 10 including the top opening 11, and the annular groove 13 has a cylindrical standing wall portion 14a.
And an annular flat portion 14b.

Reference numeral 20 denotes a ball stud, and the ball stud 20 is a ball head 21 and a shaft portion integrally formed with the ball head 21.
Equipped with 22.

The outer diameter of the ball head 21 is the opening 11 of the housing 10.
Is formed larger than the diameter of the ball stud 20
Fits and inserts the ball head 21 from the top opening 11 of the housing 10 to seat it on the inner concave spherical surface portion 12 of the housing 10, and allows the shaft portion 22 to project from the opening 11 to the housing 10. It is assembled.

Reference numeral 30 denotes a metal ring body disposed on the annular step portion 14 of the housing 10. The metal ring body 30 has an inner surface fitted to the cylindrical standing wall portion 14a of the annular step portion 14, and an end surface of the metal ring body 30. The ring-shaped step portion 14 is fitted and seated on the annular step portion 14 so as to abut on 14b.

When the metal ring body 30 is fitted and seated on the annular step portion 14, it is not necessary to press-fit with a large interference. When the metal ring body 30 is press-fitted into the annular step portion 14 with a large tightening margin, the tightening margin affects the inner concave spherical surface portion of the housing, and the concave spherical surface portion 12 and the concave spherical surface portion 12 are fitted and seated. This is because the predetermined torque applied to the ball head 21 varies.

Reference numeral 40 denotes a dust seal made of a rubber elastic body. One end of the dust seal 40 is fitted and fixed to the outer peripheral surface of the shaft portion 22 of the ball stud 20, and the other end is mounted in the annular groove 13 of the housing 10. .

Reference numeral 50 is a fastening clip for fastening and fixing the dust seal 40 in the annular groove 13.

The fastening clip 50 is formed by closely winding a spring steel wire rod having a flat cross section in a coil shape, and the outer diameter of the clip 50 is formed larger than the inner diameter of the metal ring body 30. A spring force is applied to the fastening clip 50 inward in the radial direction.

With this fastening clip 50, the annular groove of the housing 10
When tightening and fixing the dust seal 40 attached to the groove 13 in the recessed groove 13, the fastening clip 50 has an outer diameter surface side outside the inner diameter surface side of the metal ring body 30 fitted to the annular step portion 14. In other words, the fastening clip 50 is arranged so as to cover the fitting portion between the metal ring body 30 and the annular step portion 14.

By adopting such an arrangement, the fastening clip 50 plays a role of a stopper that prevents the metal annular body 30 fitted to the annular step portion 14 from slipping out in the axial direction of the ball stud.

The role of the fastening clip 50 as a stopper is that a gap is created between the metal ring body 30 and the annular step portion 13 due to the contraction of the synthetic resin housing 10 due to stress relaxation, and the fitting degree between the two changes. Even in the case of occurrence of the above, the effect that the clip 50 can prevent the metal ring body 30 from coming out of the annular step portion 13 is brought about.

Further, even if a gap is formed between the metal ring body 30 and the annular step portion 13, since the gap is covered by the dust seal 40, rainwater or the like does not enter through the gap.

FIG. 3 shows another embodiment of the present invention.

In this embodiment, the ball joints having the above-described structure are integrally formed at both ends of the synthetic resin connecting rod 10a in the synthetic resin housing 10 of the joints. It is suitable for use in stabilizer links.

〔effect〕

The ball joint of the present invention having the above-mentioned configuration has the following unique effects.

The top opening portion of the synthetic resin housing has its radial strength significantly improved by a metal ring body fitted to an annular portion of the outer peripheral surface of the opening, and the metal ring body is pulled out to act on the ball stud. Since it acts as a large resistance force to the directional load, the expansion deformation of the opening is prevented and the ball stud is prevented from coming out of the housing.

The fastening clip for fastening and fixing the dust seal in the annular groove is formed such that the outer diameter thereof is larger than the inner diameter of the metal ring body fitted into the annular step portion, and the metal ring body and the annular step portion are joined together. Since it is arranged so as to cover the fitting portion, it acts as a stopper that prevents the metal ring body from slipping out in the axial direction of the ball stud, and stress of the synthetic resin housing between the metal ring body and the annular step portion. Even if a gap is created due to contraction due to relaxation and the degree of fitting between the two changes, the metal ring body is prevented from slipping out of the annular step portion, and the above effect is maintained for a long period of time.

Even if a gap is formed between the metal ring body and the annular step portion, since the gap is covered with the dust seal, rainwater or the like does not enter through the gap.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a ball joint of the present invention, FIG. 2 is an enlarged sectional view of an essential part of FIG. 1, FIG. 3 is a sectional view showing another embodiment of the present invention, and FIG. It is sectional drawing which shows a technique. 10: Synthetic resin housing, 11: Opening 12: Concave spherical surface, 13: Annular groove 14: Annular step, 20: Ball stud 21: Ball head, 22: Shaft 30: Metal ring, 40: Dust seal 50 : Fastening clip

Claims (1)

[Scope of utility model registration request] 1. A synthetic resin housing having an opening at the top and a concave spherical surface continuous with the opening on the inner surface, and an annular groove on the outer peripheral surface of the opening and an annular step continuous with the groove. And a ball stud composed of a ball head and a shaft portion integrally formed with the ball head is fitted on and seated on the concave spherical surface portion of the housing. It is arranged so as to project from the opening, a metal ring is fitted in the annular step of the housing, and one end is fitted in the annular concave groove of the housing on the outer peripheral surface of the shaft portion of the ball stud. The other end of the dust seal is fitted and the other end of the dust seal is fixed by a fastening clip having an outer diameter larger than the inner diameter of the metal ring body fitted in the annular step portion in the annular groove. And the metal by the fastening clip Ball joint body, characterized in that the movement in the axial portion direction of the ball stud is constrained.