JPH058341Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a synthetic resin ball seat that slides and supports the ball head of a ball joint used in an automobile suspension system or steering system.

[Conventional technology]

In general, ball joints, especially ball joints used in automobiles, are strictly required to have a stable torque that shows a predetermined value, and that the displacement (lift) of the ball stud under load be within a certain limit. Moreover, wear resistance of the ball seat that slides and supports the ball head is strictly required.

Conventionally, the structure of the ball joint was
There is a structure shown in Fig. 1 or Fig. 10.

The ball joint shown in FIG. 9 includes a ball head 2 integrally formed at one end of a ball stud 1.
has an opening 31 on the top and the opening 31 on the inner surface.
A plurality of cut grooves 3 are formed in the circumferential direction of the ball stud 1 from the opening 31 toward the axial direction of the ball stud 1.
3 and the synthetic resin ball seat 3 having a concave groove 34 continuous with the cut groove 33 is fitted and seated in the concave spherical surface part 32, and this is inserted into the socket 4 and the bottom opening of the socket 4 is inserted. is closed with a closing plate 5, and assembled by caulking the periphery of the bottom opening of the socket 4.

The ball joint shown in FIG. 10 has a ball head 2 integrally formed at one end of a ball stud 1, and has an opening 31 at the top and a concave spherical surface 32a continuous with the opening 31 on the inner surface. A circular hole 35 is provided at the bottom of the concave spherical surface portion 32a, and a plurality of cut grooves 3 are formed in the circumferential direction from the opening 31 toward the axial direction of the ball stud 1.
3, a synthetic resin ball seat division piece 3a having a concave groove 34a continuous with the cut groove 33, and the circular hole 3.
A synthetic resin ball seat 3 is formed of a synthetic resin ball seat divided piece 3b which is inserted into a synthetic resin ball seat segment 3b and has a concave spherical surface part 32b having the same curvature as the concave spherical surface part 32a and a concave groove 34b continuous with the concave groove 34a. is fitted and seated on the concave spherical portions 32a and 32b of the ball seat, and is inserted into the socket 4, and a spring elastic body 6 is arranged at the bottom of the ball seat divided piece 3b,
closing the bottom opening of the socket 4 with a closing plate 5;
The socket 4 is assembled by caulking the periphery of the bottom opening.

[Problem that the invention attempts to solve]

In any of the above-mentioned ball joint structures, a synthetic resin ball seat 3 that fits and seats the ball head 2 and slides and supports the ball head 2 is provided.
is press-fitted into the socket 4 so as to provide an appropriate interference to the ball head 2 in order to satisfy the above-mentioned requirements.

However, the interference given to the ball head 2 causes plastic deformation in the seat 3 due to wear of the ball seat 3 that slides and supports the ball head 2 and the load of the ball head 2 acting on the ball seat 3. There is a problem in that the plastic deformation escapes into the cut groove 33, resulting in a decrease in interference.

This decrease in tightening margin causes the aforementioned decrease in torque, which causes rattling of the ball joint, generation of abnormal noise, etc.

Although the above-mentioned problem can be solved by using a ball seat without kerfs, the kerfs are always required in view of the peculiarities of the shape of the ball head.

Furthermore, a configuration in which the width of the slit groove is made extremely narrow can be considered, but this is not necessarily a good idea in view of problems in manufacturing the mold and the durability of the mold.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to obtain a synthetic resin ball seat that can suppress the reduction in interference as much as possible.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention adopts the following configuration (technical means).

That is, it is a synthetic resin ball seat that has an opening at the top and a concave spherical surface continuous with the opening on the inner surface, and the ball seat has a groove extending from the opening along the axial direction of the seat. A plurality of cut grooves are formed in the circumferential direction from the concave spherical surface toward the sheet thickness direction, each consisting of a wide part and a narrow part narrowed by the wide part and a stepped part. The synthetic resin ball seat is characterized in that after passing through the equator of the concave spherical surface, the ball is continuous with a groove formed in the concave spherical surface.

In the above structure, the synthetic resin constituting the ball seat is a polyacetal resin, a polyamide resin, or an oil-impregnated synthetic resin containing a lubricating oil agent therein.

[Action/Effect]

The synthetic resin ball seat of the present invention having the above-mentioned configuration has the following unique functions and effects.

By constructing the cut groove formed in the synthetic resin ball seat with a wide part and a narrow part narrowed by the wide part and a stepped part, the strength of the cut groove can be increased, and the ball head The ball seat is not subjected to plastic deformation due to the load acting on it.

Due to the above effects, a decrease in the interference provided to the ball head can be avoided as much as possible, and the performance required of the ball joint can be maintained for a long period of time.

〔Example〕

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

Note that the same parts as in the prior art described above will be described with the same reference numerals.

1 to 3 show a one-piece ball seat.

The synthetic resin ball seat 3 has an opening 31 at the top.
and a concave spherical surface part 32 continuous to the opening 31 and centered on the spherical center O ₁ on the inner surface, and a convex spherical surface part 36 centered on the spherical center O ₂ from the opening 31 side on the outer surface. It is provided with a cylindrical surface portion 37 that is continuous with the cylindrical surface portion 37.

The ball seat 3 has a groove extending from the opening 31 along the vertical line passing through the ball center O ₁ of the seat concave spherical surface 32 and toward the thickness direction of the seat concave spherical surface 32 in the circumferential direction of the seat. Multiple pieces (3 in the example)
A wide part 33a formed from the inner surface of the concave spherical surface part 32 in the thickness direction thereof, and a wide part 33 formed therein.
A narrowed part 33c having a stepped part 33b
It is composed of.

After the cut groove 33 passes through the equator R of the concave spherical surface portion 32, the groove 33 formed in the concave spherical surface portion 32
4 (Figs. 1 to 3).

A ball head 2 is provided at one end in the concave spherical surface portion 32 of the synthetic resin ball seat 3 having the above-described structure.
A ball stud 1 integrally having a ball head 2 is disposed with the ball head 2 fitted and seated.

The ball seat 3 on which the ball head 2 is fitted and seated has a concave spherical surface portion 41 on its inner surface corresponding to the convex spherical surface portion 36 on the outer surface of the ball seat 3;
The socket 4 is press-fitted into the socket 4, which has a cylindrical surface portion 42 that is continuous with the cylindrical surface portion 42, and a thin cylindrical portion 43 that is continuous with a shoulder portion at the lower end peripheral edge of the cylindrical surface portion 42. The socket 4
The lower surface of the ball seat 3 press-fitted inside is pressed against the closing plate 5, and the closing plate 5 closes the lower end opening of the socket 4 by caulking the thin cylindrical portion 43 of the socket 4 inward. (Fig. 4).

5 to 8 show a split type synthetic resin ball joint.

The synthetic resin ball seat 3 is a sheet dividing piece 3
It is composed of a and 3b.

The sheet division piece 3a has an opening 31 at the top, a concave spherical part 32a centered on the spherical center _O1 , a circular hole 35 at the bottom of the concave spherical part 32a, and a circular hole 35 on the outside. It is provided with a convex spherical surface portion 36 centered on the spherical center O ₂ from the opening 31 side, and a cylindrical surface portion 37 continuous to the convex spherical surface portion 36 .

The sheet dividing piece 3a extends from the opening 31 along the vertical line passing through the spherical center O ₁ of the seat concave spherical section 32a and toward the thickness direction of the seat concave spherical section 32a in the circumferential direction of the seat. A plurality of (six in the embodiment) cut grooves 33 are formed in the groove, and the cut grooves 33 are connected to a wide portion 33a formed from the inner surface of the concave spherical surface portion 32a in the thickness direction thereof. It is composed of a narrowed portion 33c having a narrowed portion 33a and a stepped portion 33b. The cut groove 33
passes through the equator R of the concave spherical surface portion 32a, and then continues to the concave groove 34a formed in the concave spherical surface portion 32a (FIGS. 5 and 6).

The sheet dividing piece 3b has a cylindrical surface portion 38 on its outer surface that fits into the inner surface of the circular hole 35 of the sheet dividing piece 3a, and a concave spherical surface portion 3 having the same curvature as the concave spherical surface portion 32a on its upper surface.
2b, a circular hole 39 at the bottom of the concave spherical surface part 32b, and a protrusion surrounding the circular hole 39 on the lower surface, and a plurality of concave grooves 34b are formed in the concave spherical surface part 32b. figure).

When the sheet dividing piece 3b is fitted and inserted into the circular hole 35 of the sheet dividing piece 3a, the groove 34b,
It is configured to communicate with 34a.

Concave spherical surface portions 32a, 32b of the synthetic resin ball seat 3 consisting of the above-mentioned seat division pieces 3a, 3b
A ball stud 1 integrally having a ball head 2 at one end is disposed with the ball head 2 fitted and seated.

The ball seat 3 on which the ball head 2 is fitted and seated has a concave spherical surface portion 41 on its inner surface corresponding to the convex spherical surface portion 36 on the outer surface of the ball seat 3;
The socket 4 is press-fitted into the socket 4, which has a cylindrical surface portion 42 that is continuous with the cylindrical surface portion 42, and a thin cylindrical portion 43 that is continuous with a shoulder portion at the lower end peripheral edge of the cylindrical surface portion 42.

The lower surface of the seat segment 3b of the ball seat 3 press-fitted into the socket 4 is pressed by the coil spring 6 via the backing plate 7, and the lower end opening of the socket 4 is closed by a closing plate. It is fixed by caulking the thin cylindrical portion 43 of the socket 4 inward (FIG. 8).

The cut grooves 33 formed in the synthetic resin ball seat 3 in this way are connected to the wide portion 33a and the wide portion 33.
A narrowed part 33c having a stepped part 33b
With this structure, the strength of the cut groove 33 can be improved, and the ball seat 3 will not be plastically deformed by the load applied from the ball head 2. As a result, a reduction in interference is prevented as much as possible, and the performance required of the ball joint can be maintained over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view (Fig. 2 - line sectional view) showing a synthetic resin ball seat, Fig. 2 is a plan view of Fig. 1, Fig. 3 is an enlarged view of the cut groove, and Fig. 4 is FIG. 5 is a vertical cross-sectional view showing a ball joint assembled using the ball seat shown in FIG. 1; FIG.
6 is a plan view of FIG. 5, FIG. 7 is a vertical sectional view showing a synthetic resin ball seat segment to be combined with the synthetic resin ball seat segment shown in FIG. 5, and FIG. Figures 9 and 10 are longitudinal cross-sectional views showing ball joints assembled using the ball sheet split pieces shown in Figures 6 and 6, and Figures 9 and 10 are vertical cross-sectional views showing ball joints using conventional synthetic resin ball sheets. It is a front view. 1...Ball stud, 2...Ball head,
3...Synthetic resin ball sheet, 32, 32a,
32b... Concave spherical surface portion, 33... Cut groove, 33a
...Wide portion, 33b...Stepped portion, 33c...Narrowed portion, 34, 34a, 34b... Concave groove.

Claims (1)

[Scope of utility model registration request] A synthetic resin ball seat having an opening at the top and a concave spherical surface continuous with the opening on the inner surface, the ball seat having a concave spherical surface along the axial direction of the seat from the opening. A plurality of cut grooves are formed in the circumferential direction, each consisting of a wide part and a narrowed part having a stepped part and a wide part in the sheet thickness direction. 1. A synthetic resin ball sheet, which is continuous with a groove formed in a concave spherical surface after passing through the equator of the spherical surface.