JPH03249419A - Thrust ball bearing race and its manufacture - Google Patents

Abstract

PURPOSE:To maintain the cost for molding and processing low, and to carry out satisfactory quenching work by making the height of a protruded part smaller than the depth of a trajectory surface, and by making the width of the protruded part smaller than the width of the trajectory surface in determining press working size of a material before quenching. CONSTITUTION:When a thrust ball bearing race main body 8 is to be manufactured, a trajectory surface 6 and a protruded part 12 of a material is press- worked before quenching. The height H of the protruded part 12 is smaller than the depth D of the trajectory surface 6, while the width (w) of the protruded part 12 is smaller than the width W of the trajectory surface 6, in determining the size for processing. The cost for molding and processing can be maintained low, and satisfactory quenching work can be carried out thereby.

Description

[Detailed Description of the Invention] (Industrial Application Field) A thrust ball bearing race and a method for manufacturing the same according to the present invention are provided in a suspension part of an automobile, etc., and support the load in the thrust direction applied to a rotating part. The present invention provides an inexpensive race that is incorporated into a thrust ball bearing that is used when allowing rotation of this rotating part.

(Prior art) Thrust ball bearings are installed in rotating parts to which thrust loads are applied, such as suspension parts of automobiles, so as to support the load in the thrust direction applied to the rotating parts while allowing the rotating parts to rotate. I have to.

As is well known, a thrust ball bearing consists of a pair of races, each formed in a circular ring shape, with raceway surfaces formed on opposing surfaces, and a plurality of balls that are freely relocatable between the raceway surfaces of both races. As the balls are transferred, the member supporting one race and the member supporting the other race are allowed to rotate relative to each other.

In addition, in order to facilitate the installation of such thrust ball bearings to rotating parts, a synthetic resin case may be attached to the above pair of races, surrounding the parts other than the raceway surface of each race. It is being done.

Figure 5 shows a conventionally known thrust ball bearing with a synthetic resin case, French Patent Publication No. 237.
5484 is shown.

In the thrust ball bearing with a synthetic resin case shown in FIG. 5, the lower surface of one of the synthetic resin cases 2.3 attached to a pair of races 1.1 By engaging the hooks 4a and 4b hanging down from both ends with the hooks 5a and 5b planted on the upper surface of both ends of the other synthetic resin case 3, both synthetic resins will be attached unless strong force is applied. The thrust ball bearings are made easier to handle by preventing the manufactured cases 2 and 3 from separating.

Each race 1.1 made of a steel plate and hardened by quenching has a raceway surface 6.6 on one side, and is placed in a case 2.3 with each raceway surface 6.6 facing each other. A plurality of balls 7 are held between raceway surfaces 6.6 of both races 2.3.

Since the thrust ball bearing with a synthetic resin case is constructed as described above, based on the transfer of the plurality of balls 7 held between a pair of races 1. Relative rotation with the member to which the other case 3 is attached is allowed.

(Problem to be solved by the invention!!l) However, in the case of conventional thrust ball bearings constructed and operated as described above, they were not necessarily satisfactory in terms of manufacturing costs.

That is, when manufacturing the race 1.1 having the shape shown in FIG.
A raceway surface 6 having an arc-shaped cross section is formed on the entire circumference of one side of the circular main body 8 by cutting using a lathe or the like.
Use lace material.

Next, as shown in Figure $6, a plurality of lace materials 9.9 are closely stacked, and the plurality of lace materials 9.9 are hardened to form the lace 1.1 shown in Figure 5. .

However, the work of forming the raceway surface 6 having an arcuate cross section by cutting is troublesome and increases the manufacturing cost of the race 1.1.

In order to simplify the work of forming the raceway surface 6 and reduce the manufacturing cost of the race 1.1, the above-mentioned raceway surface 6 may be formed by press working. If you simply change from cutting to pressing, you will not be able to perform the next hardening process.

That is, if the raceway surface 6 having an arcuate cross section is formed on one side of the main body 8 by press working performed inside the shell, the other surface of the main body 8 will protrude more than the recess of the raceway surface 6.

For example, as shown in FIG. 7, if a raceway surface 6 with a radius of curvature R is formed by press working on one side (the top surface in the figure) of a steel plate with a thickness of t, then (Bottom side of figure)
, a convex portion 10 having a radius of curvature of R10t is formed.

As a result, as shown in the same figure, the raceway surface 6 and the convex portion 1 are respectively
When stacking a plurality of lace materials 9.9 formed with 11.0, there is a gap 11.9 between adjacent lace materials 9.9.
11 will occur.

If the plurality of lace materials 9.9 are hardened while the gaps 11.11 are formed in this way, each lace material 9.9 will be distorted by the heat during the hardening process.
I can't get good quality lace.

If the lace material 9.9 is hardened one by one while being held down with a jig, it is possible to prevent the above-mentioned distortion from occurring. The work of attaching and detaching the lace to the jig is troublesome and also causes an increase in the production cost of the lace 1.1.

The thrust ball bearing race and the manufacturing method thereof of the present invention solve the above-mentioned disadvantages.

(Means for Solving the Problems) The thrust ball bearings that are the object of the thrust ball bearing race and the manufacturing method of the present invention are each formed in a circular ring shape,
a pair of races with raceway surfaces formed on opposing surfaces;
It consists of a plurality of balls provided between the raceway surfaces of both races.

The race of the thrust ball bearing according to claim 1 is made of a hardened steel plate, and is formed by press forming on the entire circumference of one side of a circular ring-shaped main body, and has a raceway surface having an arc-shaped concave cross section. and a convex portion formed on the entire circumference of the other surface of the main body when forming the raceway surface, and the depth dimension of the raceway surface is set to be smaller than the height dimension of the convex portion, and the width dimension of the raceway surface is are each larger than the width dimension of the convex portion.

In addition, the method for manufacturing a race for a thrust ball bearing according to claim 2 includes press-forming a circular ring-shaped main body made of unhardened steel plate, so that a circular cross-section is formed around the entire circumference of one side of the main body. a convex portion that forms an arcuate concave raceway surface, and at the same time has a height dimension smaller than a depth dimension of the raceway surface and a width dimension smaller than the width dimension of the raceway surface, all around the other surface of the body; After forming the lace material,
A plurality of lace materials are closely connected to the flat portions on one side that exist on the inner and outer circumferential sides of each raceway and the flat portions on the other side that exist on the inner and outer circumferential sides of each convex part. A plurality of lace materials are superposed one on top of the other in a state where the lace materials are stacked on top of another, and the plurality of lace materials are hardened to form a lace while being pressed down with a jig.

(Function) The thrust ball bearing incorporating the race of the present invention as described above supports the load in the thrust direction applied to the rotating part and allows the rotating part to rotate. It is similar to the built-in thrust ball bearing.

However, in the case of the thrust ball bearing race and its manufacturing method of the present invention, the raceway surface can be formed by press working,
Moreover, since the lace materials forming the raceway surfaces can be closely overlapped, the lace manufacturing process can be simplified and the lace manufacturing cost can be reduced.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

1 to 3 show a first embodiment of the present invention, FIG. 1 is a cross-sectional view showing a state in which lace materials are stacked, and FIG. 2 is a sectional view showing a plurality of stacked lace materials held together by a jig. FIG. 3 is a longitudinal sectional front view showing the attached state, and FIG. 3 is a sectional view of a thrust ball bearing with a synthetic resin case incorporating a race obtained according to the present invention.

When making a lace by the method of the present invention, first, a circular ring-shaped main body 8 made of unhardened steel plate is press-formed, so that a cross-section is formed on the entire circumference of one side (the top surface in FIG. 1) of the main body 8. At the same time as forming the raceway surface 6 concave in an arc shape,
A convex portion 12 is formed all around the other surface (lower surface in the figure) of the main body 8 to form a lace material 13.

However, in the case of the present invention, when the raceway surface 6 and the convex portion 12 are press-molded, the raceway surface 6 and the convex portion 12 are formed in a part of the main body 8.
By compressing the thickness of the portion sandwiched between the two, the height H of the convex portion 12 is made smaller than the depth of the raceway surface 6 (H<D), and the convex portion 12 (WOW
)are doing.

In this way, the dimensions of the raceway surface 6 and the convex portion 12 are regulated by adjusting the shapes of the upper and lower molds used for press working to the dimensions of the raceway surface 6 and the convex portion 12. , can be easily done. Furthermore, when the thickness of the raceway surface 6 portion is compressed during press working, the metal material of the raceway surface 6 portion becomes denser and the strength of this portion is improved. Raceway surface 6
As a result of regulating the size of the convex portion 12 as described above, the lace material 13 manufactured in the process of carrying out the manufacturing method of the present invention
The convex portion 12 on the other side can also completely enter inside the raceway surface 6 on one side of the lace material 13.

After forming the lace material 13 having the raceway surface 6 and the convex portion 12 having the above-mentioned dimensions, a plurality of lace materials 13.13 are overlapped as shown in FIG. Since the convex portion 12 on the other side of the material 13 can completely enter inside the raceway surface 6 on one side of each lace material 13,
As shown in FIG. 1, when a plurality of lace materials 13.13 are stacked one on top of the other, a flat portion on one side exists on the inner and outer peripheral sides of the raceway surface 6.6 of each lace material 13.13. 14
．． 14 and the flat portions 15.15 on the other side, which are present on the inner and outer circumferential sides of the convex portion 12 of each lace material 13.13, are in close contact with each other.

In this way, one side flat part 14.14 and the other side flat part 15
．． Once a plurality of lace materials 13.13 are stacked on top of each other with the lace materials 15 and 15 in close contact with each other, the plurality of lace materials 13.13 are held down by a jig 16 as shown in FIG. To prevent each lace material 13.13 from being distorted during a hardening process.

The jig 16 is composed of a pair of upper and lower restraining plates 17.18, and bolts 19.19 and nuts 20.20 that connect both restraining plates 17.18 to each other. A convex portion 12 formed on the other surface of the lace material 13 is inserted into one surface of one (lower side in FIG. 2) of the holding plate 18 that faces the other holding plate 17 (upper surface in FIG. 2). A recessed portion 21.21 is formed for this purpose, so that the flat portion 15.15 on the other side of the lace material 13 existing at the end is brought into close contact with one side of the one presser plate 18.

A pair of holding plates 17 and 18 forming the jig 16 as described above.
A plurality of lace materials 13. are overlapped with each other.
If 13 is clamped, bolt 19.19 and nut 20
．． 2o, the pair of restraining plates 17
．． 18 strongly presses down the plurality of lace materials 13 and 13.

Then, with the plurality of lace materials 13.13 strongly pressed in this way, the plurality of lace materials 13.13 are put into a heating furnace together with the jig 16, and quenched to form laces 22.22. do.

The race 22.22 made in this way is attached to a synthetic resin case 2.3, as shown in FIG. Use thrust ball bearings.

However, the synthetic resin case 2.3 to which the races 22.22 of the present invention are mounted has a recess 23.23 formed on one side of each race 22.22 to allow the projection 12.12 to escape. There is.

The rest of the structure and operation are the same as those of the conventional thrust ball bearing with a synthetic resin case incorporating a race.

4゜ Next, FIG. 4 shows a second embodiment of the present invention.

In the case of this embodiment, the convex portion 1 formed on the other surface of the main body 8 is larger than the radius of curvature R of the raceway surface 6 formed on one surface of the main body 8.
By reducing the radius of curvature r of the convex portion 12 (R>r), the height H of the convex portion 12 is made smaller (HAD) than the depth dimension of the raceway surface 6, and The width dimension W is made smaller (w smaller than the width dimension W of the raceway surface 6).

Other configurations and operations are similar to those of the first embodiment described above.

(Effects of the Invention) The thrust ball bearing race and its manufacturing method of the present invention are configured and operate as described above, but the race manufacturing process can be simplified and the race manufacturing cost can be reduced. The manufacturing cost of thrust ball bearings can be reduced.

[Brief explanation of drawings]

′! Figures J1 to J3 show the first embodiment of the present invention. Figure 1 is a cross-sectional view showing a state in which lace materials are overlapped, and Figure 2 is a sectional view showing a state in which multiple lace materials are overlapped and held down by a jig. FIG. 3 is a cross-sectional view of a thrust ball bearing with a synthetic resin case incorporating the race obtained according to the present invention, and FIG. 4 shows a second embodiment of the present invention. Figure 5 is a cross-sectional view similar to Figure 1, Figure 5 is a cross-sectional view of a thrust ball bearing with a synthetic resin case incorporating a conventional race, Figure 6 is a first example of a conventional race, and Figure 7 is the same. FIG. 2 is a cross-sectional view similar to FIG. 1 showing a second example; 1: Lace, 2.31 Synthetic resin case, 4a, 4b,
5a, 5b: Hook piece, 6: Raceway surface, 7: Ball, 8: Main body, 9
: Lace material, 10: Convex part, 11: Gap, 12: Convex part,
13: Lace material, 14: Flat part on one side, 15: Flat part on other side, 16: Jig, 17.18: Holding plate, 19: Bolt, 20: Nut, 21: Recessed part, 22: Lace, 23:
recess. Figure diagram? figure

Claims (2)

[Claims] (1) A thrust ball bearing race consisting of a pair of races each having a circular ring shape and raceway surfaces formed on opposing surfaces, and a plurality of balls provided between the raceway surfaces of both races. A raceway surface with an arc-shaped cross section is formed by press forming on the entire circumference of one side of the annular main body made of hardened steel plate, and when this raceway surface is formed, the other surface of the main body is formed by press forming. and a convex portion formed around the entire circumference, the thrust having a depth dimension of the raceway surface that is larger than a height dimension of the convex part, and a width dimension of the raceway surface that is larger than a width dimension of the convex part. Ball bearing race. (2) Manufacture of a race for a thrust ball bearing consisting of a pair of races each formed in a circular ring shape and having raceway surfaces formed on opposing surfaces, and a plurality of balls provided between the raceway surfaces of both races. In this method, a ring-shaped main body made of unhardened steel plate is press-formed to form a raceway surface with an arc-shaped cross section on the entire circumference of one side of the main body, and at the same time, the main body is After making a lace material by forming a convex portion having a height dimension smaller than the depth dimension of the raceway surface and a width dimension smaller than the width dimension of the raceway surface on the entire circumference of the other surface, a plurality of laces are formed. A state in which the material is brought into close contact with the flat part on one side that exists on the inner and outer circumferential sides of each raceway surface and the flat part on the other side that exists on the inner and outer circumferential sides of each convex part. A method for manufacturing a race for a thrust ball bearing, in which a plurality of race materials overlapped with each other are pressed down with a jig, and then the multiple race materials are hardened to form a race.