JPS6212094Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a corrugated retainer for a bearing, and relates to a corrugated retainer made of plastic that reduces the number of parts and facilitates assembly by making the retainer made of plastic.

Generally, a corrugated retainer for a ball bearing is formed by pressing a steel plate, and as shown in Fig. 6, a ball A placed between an inner ring and an outer ring is held between both sides and held in a predetermined position. Its function is to hold it in place. That is, after storing the ball A in the holding part D made by combining the retainer pieces B and C from both sides, the flat parts E of both the retainer pieces C and D are welded, or the pin F is attached as shown in FIG. Both retainer pieces B and C are fixed together by caulking using the retainer pieces B and C.

However, many problems still remain with conventional corrugated steel plate retainers constructed by welding or caulking. That is, there is a risk that metal dust may adhere to the ball raceway surface during welding or caulking, and a separate cleaning process is required to remove this, and an oxide film is likely to be formed on the raceway surface during welding. , which has the disadvantage of having a negative effect on the rolling properties of the ball.

In addition, it is difficult to simplify the assembly because it takes time and effort to position the retainer pieces B and C to be assembled from both sides, and there are also many problems in terms of preventing rotational contact noise with the balls and reducing weight. .

The present invention aims to solve the above-mentioned problems with conventional corrugated steel plate retainers.
By molding the retainer from a contact-resistant and wear-resistant plastic material, and by forming appropriate recesses and protrusions on each retainer piece that is assembled from both sides, we aim to simplify the assembly process of the bearing and improve assembly accuracy. The object of the present invention is to provide a plastic retainer that can completely prevent rotational contact noise and significantly reduce manufacturing costs.

Hereinafter, the details will be explained based on the embodiments of the present invention shown in FIGS. 1 to 5. It should be noted that the present invention is not limited to the configurations of the embodiments, but may be modified as appropriate within the scope of the invention.

1 and 2 show corrugated retainer pieces 4 and 5 according to an embodiment of the present invention, and the pair of corrugated retainer pieces 4 and 5 constituting the retainer are made of durable material such as hard nylon or polyacetate. By integrally molding a so-called engineering plastic with excellent contact and abrasion resistance, the ball holding part 6 having an even number of spherical concave parts and the flat part 7 molded with a slightly thick wall are arranged alternately. It is formed into a ring shape with equal inner and outer diameters, and half of the flat parts 7 of each retainer piece 4, 5 have a circular recess 9 on the inner surface, and the other half of the flat part 7 has a circular recess 9. A cylindrical protrusion 10 is formed on the inner surface of each of the parts 7.

That is, on the inner surface of the flat portion 7 of one retainer piece 4, circular recesses 9 and columnar protrusions 10 are alternately provided. Further, the recess 9 of the retainer piece 4 is also formed on the inner surface of the flat part 7 of the other retainer piece 5.
Column-shaped protrusions 10 and circular recesses 9 that fit into the protrusions 10, respectively, are provided alternately. Therefore,
When both retainer pieces 4 and 5 are assembled from both sides, the protrusion 10 fits into the recess 9. When the inner and outer surfaces of the two are perfectly aligned, the opposing ball holding parts 6 and 6 of both retainer pieces 4 and 5 ensure that the retainer pieces 4 and 5 have a true spherical inner surface and are concentrically aligned. A plurality of arrayed ball holding sections are configured.

As shown in FIG. 3, the recess 9 formed in the flat portion 7 of each of the retainer pieces 4, 5 has an inner circumferential surface 9a that is tapered downward in diameter with a parallel side surface 9b. The upper part of the recess 9, that is, the parallel side faces 9b, is used as a guide part, and the lower tapered face 9c is used as a welding part for ultrasonic welding, which will be described later.

Further, as shown in FIG. 3, a groove 9d is formed around the recess 9 facing the inner surface of the flat portion 7 of each retainer piece 4, 5. When welding the outer circumferential surface 10a of the protrusion 9a and the protrusion 10 by ultrasonic welding, a part of the molten resin melts and flows there.

In this embodiment, each retainer piece 4, 5
Although the recesses 9 and protrusions 10 are arranged alternately in the flat part 7 of the retainer pieces 4 and 5, the present invention is not limited to the above embodiment. As long as the numbers of recesses 9 and protrusions 10 are the same, their arrangement may be changed as appropriate.

Next, assembly of the retainer according to the present invention will be explained.

First, a predetermined number of balls 3 are inserted into the gap between the inner ring and the outer ring.
Next, the retainer pieces 4 and 5 are inserted from both sides, the balls 3 are stored in the holding part 6, and the tip of each protrusion 10 is inserted into the recess 9 as shown in FIG.
The retainer pieces 4 and 5 are fitted into the guide part 1 to regulate the combined position of both retainer pieces 4 and 5, and then the tapered surface 9c of the recess 9 and the outer peripheral surface of the tip of the protrusion 10 are ultrasonically welded while applying pressure from above. Both are fixed and integrated via the welding layer 2.

Incidentally, by fitting the protrusion 10 into each recess 9, the mutual assembly position of both the retainer pieces 4 and 5 is regulated, and the center alignment of the retainer and the ball 3 is automatically achieved. That will happen.

In addition, when ultrasonic welding is performed, as is well known, protrusions, corners, etc. are more likely to melt than surfaces with relatively large areas. For this reason, the tip of the protrusion 10 tends to melt, and a part of it melts, but the groove 9d around the recess 9
This is advantageous because the molten resin flows into the welding area and is absorbed therein, resulting in an extremely clean finished welded surface.

Since the present invention has the above-described configuration, it has many excellent effects as described below.

(1) Since each of the retainer pieces 4 and 5 is formed by integral molding of plastic, it is easy to mass-produce, and it is possible to reduce the weight and diversify the colors.

(2) A recess 9 and a protrusion 10 are formed in the flat portions 7 of both retainer pieces 4 and 5, and the two are assembled by fitting the recess 9 and the protrusion 10. As a result, simply by fitting the recess 9 and the protrusion 10, the mutual positions of both retainer pieces 4 and 5 are regulated, which facilitates the retainer assembly work and significantly improves assembly accuracy. .

Furthermore, by fitting the recess 9 and the protrusion 10, the assembly strength of both retainer pieces 4 and 5 is significantly increased, and in particular, displacement of both retainer pieces 4 and 5 in the thrust direction is completely prevented. .

(3) By fitting the recess 9 and the protrusion 10, the retainer and the balls 3 can be automatically aligned;
Since the retainer itself is made of plastic, the rotating contact noise between the balls and the retainer can be completely absorbed, significantly reducing bearing noise.

(4) Since the number of flat parts 7 and ball holding parts 6 of each retainer piece 4, 5 is an even number, and the same number of recesses 9 and protrusions 10 are formed in each flat part 7, both retainer pieces 4, 5 have the same shape. the result,
When injection molding the retainer pieces 4, 5, only one type of mold is required, which can reduce costs.

(5) The combination of both retainer pieces 4 and 5 can be fixed together by ultrasonic welding, making the fixing work extremely easy compared to the case of conventional corrugated steel plate retainers. There is no damage at all during fixing work.

As a result, cleaning steps and the like become unnecessary, and bearing manufacturing costs can be significantly reduced.

(6) Inner peripheral surface 9 of the recess formed in each retainer piece 4, 5
A and the protrusion outer peripheral surface 10a are welded by ultrasonic welding, so it is an extremely small retainer for miniature bearings.
It is also possible to manufacture a small type in which the flat portion 7 cannot have a sufficient bonding surface.

(7) Since the tapered surface 9c with which the tip of the protrusion 10 comes into contact is formed below the inner peripheral surface 9a of the recess 9, the recess 9 and the protrusion 10 can be welded more smoothly and reliably during ultrasonic welding. I can do it.

(8) Since the groove 9d is formed around the recess 9 facing the inner surface of the flat part 7, the remainder of the molten resin flows into the groove 9d and is absorbed. However, the remaining portion also flows into the bottom side of the recess 9. As a result, the remainder of the molten resin does not flow out to the inner surface of the flat portion 7, so that the welding surface can be finished in a more ideal state in terms of strength and precision.

As mentioned above, the present invention has extremely high practical utility.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a corrugated retainer piece according to an embodiment of the present invention, FIG. 2 is a plan view of another corrugated retainer piece combined with the wave retainer piece, and FIG. 4 and 5 are partial longitudinal sectional views showing the combination and fixed state of the retainer pieces, FIG. 6 is a plan view of a conventional steel plate retainer, and FIG. 7 is a partial longitudinal sectional view of the protrusion. I in the diagram
FIG. 4 and 5 are wave-shaped retainer pieces, 6 is a ball holding part,
7 is a flat portion, 9 is a recessed portion, 9a is an inner circumferential surface, 9b is a parallel side surface, 9c is a tapered surface, 9d is a groove, 10 is a protrusion, and 10a is an outer circumferential surface.

Claims (1)

[Scope of utility model registration request] A corrugated plastic retainer piece 4 in which an even number of ball holding parts 6 and flat parts 7 are arranged alternately;
A corrugated plastic retainer piece 5 in which ball holding parts 6 and flat parts 7 are alternately arranged symmetrically with the retainer piece 4, and half of the flat parts 7 of the total flat parts 7 of each retainer piece 4, 5. a circular recess 9 having an inner circumferential surface 9a consisting of parallel side surfaces 9b and a tapered surface 9c whose diameter decreases in cross-sectional view below the recess 9; Outer peripheries are formed on the inner surfaces of the remaining half of the flat portions 7, are fitted into the recess 9 in surface contact with the parallel side surfaces 9b thereof, and are fixed to the inner peripheral surface 9a of the recess 9 by ultrasonic welding. A cylindrical protrusion 10 having a surface 10a and a recess 9 facing the inner surface of the flat part 7
A corrugated plastic retainer characterized by having a groove 9d formed around the periphery of the retainer.