JPS6215535Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ball seat in a novel ball joint. Specifically, the present invention aims to provide a new ball seat for a ball joint that is superior in strength and has high pull-out strength.

FIG. 1 shows an example of a spherical seat in a conventional ball joint. This spherical seat a is made of a slightly elastic synthetic resin, and is supported by three independent petal-shaped protrusions c, c, and c protruding from one surface of the base b. Spherical recess d inside
It is formed by forming. Then, such a catch seat a is fixed to one of the members to be connected to each other, and a sphere e formed on the other member is fitted into a spherical recess d of the catch seat a, whereby the two The parts are connected in a ball-and-socket manner, ie, so that they can tilt relative to each other in a 360° direction.

By the way, in the spherical seat a of the conventional ball joint shown in FIG. 1, the spherical recess d
is formed by three petal-like protrusions c, c, c which are independent of each other, so that slits f, f, f are formed between them, so that the inner surface of the spherical recess d The holding force of the sphere e is weak, and it is not possible to obtain sufficient pull-out strength, that is, the strength of the force that holds the sphere e against the force that attempts to pull the sphere e out of the spherical recess d. Alternatively, the sphere e may be press-fitted into the spherical recess d, or
The stress caused by the deflection of the petal-like protrusions c, c, c caused by the movement of the sphere e within the spherical recess d due to the stress applied to the two members connected by such a ball joint is Since the protrusions c, c, and c are supported only by the root portion g of the base body b and are concentrated in this portion g, cracks often occur at the root portion g. Furthermore, as mentioned above, since the holding force for the sphere e is weak, an attempt is made to deepen the overhang at the opening of the spherical recess d to prevent the sphere e from falling out of the spherical recess d. (It is difficult to increase the pull-out strength.) If you do this,
There is a problem in that the workability of inserting the sphere e into the spherical recess d is significantly impaired.

Therefore, the present invention aims to provide a ball seat for a new ball joint that has extremely high pull-out strength, is free from the risk of cracking, and is also easy to work with when inserting the ball into the spherical recess. For example, a block body is formed from a synthetic resin having a slight elasticity such as polyacetal, a spherical recess is formed in one surface of the block body to tightly receive a sphere, and the spherical recess is The groove is characterized by forming one to several grooves extending in the axial direction, that is, from the opening toward the back, and being closed on the side opposite to the spherical recess.

Below, details of the spherical seat in the ball joint of the present invention will be explained according to the illustrated embodiments.

2 to 6 show an example of the implementation of the spherical seat in the ball joint of the present invention.

Reference numeral 1 denotes a spherical seat in a ball joint, which is formed integrally with a base body 2 in this embodiment. The spherical seat 1 and the base body 2 are made of a slightly elastic synthetic resin such as polyacetal. Note that this material is not limited to polyacetal.
Other suitable materials may also be used, such as nylon resin. The spherical seat 1 is formed by forming a spherical recess 5 in a block body 3 and opening in a surface 4 opposite to the surface connected to the base body 2. Spherical recess 5
A plurality of grooves 6 are formed in the surface 4 and extend in the axial direction of the spherical recess 5, that is, from the opening surface 4 toward the base body 2. These grooves 6 are open to the inner surface of the spherical recess 5 in a direction perpendicular to the axial direction of the spherical recess 5, and are closed by the outer wall on the opposite side. Further, the outer wall side portion of the groove 6 is a columnar (cylindrical) recess 7 having a larger diameter than the spherical recess side. Furthermore, block 3
The periphery of the spherical recess opening edge 8 of the opening surface 4 is an inclined surface 9 that slopes toward the opening edge 8 of the spherical recess 5 .

Further, each surface 10 of the block body 3 in a direction perpendicular to the axial direction is provided with a recess 11,
Chamfering etc. are performed, thereby forming a spherical recess 5,
The thickness of the wall surrounding the recess consisting of the groove 6 and the cylindrical recess 7 in the direction perpendicular to the axial direction should not be thicker than necessary, and the thickness should be averaged over the whole. There is.

The base body 2 formed integrally with the spherical seat 1 is composed of a flat plate portion 12 and a protrusion 13 protruding from the side surface of the flat plate portion 12 opposite to the seat. An annular groove 14 is formed, and this groove 14
It can be attached to a suitable member using

Thus, such a spherical seat 1 is attached to one member that is rotatably connected to each other, and the spherical body 15 attached to the other member is fitted and held within the spherical recess 5, so that both The members are connected in a ball and socket joint.

As described above, in the spherical seat of the ball joint according to the present invention, the inner surface of the spherical recess that receives and holds the spherical body is given elasticity by the groove, and the outer side of the groove is Since it is closed by the wall, the force that holds the sphere in a nearly uniform state acts on the inner surface of the spherical recess, and the holding force as a whole is quite large, making it possible to obtain a large pull-out strength. . Further, since the outside of the block body in the direction perpendicular to the axial direction is closed (there is no slit f as in the conventional case), there is no place where stress is locally concentrated and no cracks occur.

In addition, if the shape of the inner part (outer side) of the groove is made into a cylindrical shape as shown in the above embodiment, the stress generated when the spheres fit together, the stress applied to the sphere, etc. will be absorbed by the circumferential surface of the cylindrical part. Since the particles are dispersed in a direction perpendicular to the direction, the occurrence of cracks can be more reliably prevented.

Furthermore, as shown in the above embodiments, if an inclined surface is formed on the opening edge of the spherical recess, the work of inserting the sphere into the spherical recess becomes easy, and automation of the work becomes possible.

Further, in the above embodiment, grooves are provided at four locations, but the grooves are not limited to this, and may be provided at one or two locations, or any other suitable location.

Furthermore, if the front shape of the opening edge 8 of the spherical recess is elliptical, the pull-out strength can be further increased.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a spherical seat in a conventional ball joint, and Figs. 2 to 6 show an example of implementation of the spherical seat in the ball joint of the present invention. , FIG. 3 is a front view, FIG. 4 is a side view, FIG. 5 is a cross-sectional view taken along the - line in FIG. 3, and FIG. 6 is a cross-sectional view taken along the - line in FIG. 3. Explanation of symbols, 1... Spherical seat in ball joint,
3...Block body, 4...Surface where the spherical recess opens, 5...Spherical recess, 6...Groove, 9...Slanted surface.

Claims (1)

[Claims for Utility Model Registration] (1) A block body is formed of a slightly elastic synthetic resin such as polyacetal, and the block body has a spherical recess that is open on one surface and that tightly receives the sphere. and the spherical recess is formed with one or several grooves extending in the axial direction of the spherical recess, that is, from the opening toward the back, and closed at the opposite side of the spherical recess. Spherical seat in joint. (2) A spherical seat in a ball joint according to claim 1, wherein the groove formed in the spherical recess has a larger diameter on the opposite side of the spherical recess. (3) Claims 1 or 2 of the utility model registration claim characterized in that the surface of the block body where the spherical recess opens is sloped gently toward the opening. A ball seat in a ball joint. (4) Claim 1 of the utility model registration claim, characterized in that the thickness of the portion surrounding the spherical recess or groove in the direction perpendicular to the axial direction of the spherical recess is substantially uniform throughout; A spherical seat in a ball joint according to item 2 or 3.