JPH0567817U - Rolling bearing cage - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce noise caused by whirling of the cage. [Structure] A sliding contact portion 2 elastically slidingly contacting a rolling element 24 on an inner surface of one or several pockets 22 of a cage 20.
6 were arranged facing each other.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a cage for rolling bearings.

[0002]

[Prior art and its problems]

 A plurality of rolling elements of the rolling bearing are housed in a pocket of a ring-shaped cage inserted between the inner and outer rings, and the distance between the rolling elements is regulated.

By the way, a small gap called a pocket gap is formed between the rolling element and the pocket, so that the cage has six degrees of freedom. That is, as shown in FIG. 3, the retainer 10 can move in the X, Y, and Z axis directions and can rotate in the α, β, and γ directions about these three axes. As a result, the cage 10 performs various operations during rotation of the bearing. For example, consider the operation of the cage 10 based on the degrees of freedom in the X, Y and γ directions. When the rolling element 12a comes into contact with the front wall 16 of the pocket 14a in FIG. 4A, the cage 10 moves in the -Y direction due to the frictional force with the rolling element 12a. Then, this time, the rolling element 12b comes into contact with the front wall 16 of the pocket 14b, and the cage 10 moves in the -X direction. Similarly, next, the rolling element 12c contacts the front wall 16 of the pocket 14c, and the cage 10 moves in the + Y direction. Then, this time, the rolling element 12b contacts the rear wall 18 of the pocket 14b, and the cage 10 moves in the + X direction. The rolling element 12a again contacts the front wall 16 of the pocket 14a.

The cage 10 continuously performs the above-described motion during rotation, and the front wall 16 and the rear wall 18 of the pocket are eventually broken lines as shown in FIGS. 4B and 4C. However, this causes the cage 10 to swirl and generate noise. In FIGS. 4B and 4C, C is a pocket gap.

In order to reduce the cage noise, a method of reducing the pocket gap can be considered. However, when machining the cage, deformation of the cage and variations in accuracy cannot be avoided to some extent. Therefore, if the pocket gap is made too small, so-called “bug” will occur due to the plurality of pockets. This is because the cage is assembled with deformation, and due to this “dip”, excessive force is applied to the cage and heat is generated during bearing rotation.

As described above, the conventional technology has a limit in reducing the pocket gap of the cage, and therefore the reduction of cage noise has not been effectively solved.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a sliding contact portion, which is elastically constantly in contact with the surface of the rolling element, on the inner surface of one or several pockets of the cage that accommodates the rolling element of the rolling bearing. It was placed facing each other.

[0008]

[Action]

 The rolling element is restrained by the sliding contact part on the inner surface of the pocket without rattling, while the cage is restrained from moving in the X, Y, Z axis directions, so that the cage has 6 degrees of freedom from the X, Y, Z axes. It reduces to 3 degrees of freedom only in the direction of rotation around the center, preventing whirling of the cage.

[0009]

【Example】

 FIG. 1 shows a crown type cage 20 according to a first embodiment of the present invention. Only one pocket 22 of the cage 20 has a minus pocket gap. That is, the inner diameter of the pocket 22 before assembly is slightly smaller than the diameter of the rolling element 24, and after assembly, the rolling element 24 is elastically pressed by the pair of sliding contact portions 26 formed on the inner surface of the pocket 22. It is like this. The pocket 22 has one end opened like the other ordinary curved pockets 28, but the shape thereof is substantially U-shaped. Further, as shown in FIG. 1A, a slide contact portion 26 which is shallowly recessed in a dish shape is formed on each of a pair of facing surfaces 30 facing each other inside the pocket 22. The pair of opposing surfaces 30 are formed on one side surface of the left and right partition walls 32 between the pocket 22 and the adjacent pocket 28, and the partition walls 32 can be elastically biased in the left and right direction in FIG. 1D. Has been done.

The radius of curvature of the sliding contact portion 26 is made equal to the radius of curvature of the rolling element 24, and the surfaces of the left and right ends of the rolling element 24 are in surface contact with the sliding contact portion 26. If the area of the sliding contact portion 26 is too large, friction and heat increase will occur, so the area is set to the minimum necessary for holding the rolling elements 24.

The shape of the sliding contact portion may be the above-mentioned dish shape, or may be a rectangular sliding contact portion 42 as a whole that is slightly recessed as shown in FIG. 2A. The sliding contact portion 42 also elastically comes into surface contact with the left and right side surfaces of the rolling element 24 and holds the rolling element 24. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation of the cage 20 will be described. When the inner ring of the bearing rotates, for example, in the direction of arrow A in FIG. 1 (b), the rolling element 24 rotates counterclockwise (in the direction of arrow B), and the sliding contact portion 26 of the pocket 22 of the retainer 20 and the rolling element 24 The friction causes the cage 20 to receive a counterclockwise rotation moment in FIG. 1 (b). Since the sliding contact portion 26 is always in elastic sliding contact with the rolling element 24 with a constant force due to the biasing force of the partition wall 32, the rotational moment is substantially constant. Therefore, the cage 20 rotates with the rolling elements 24 at a constant speed without rattling, and the inner surface of the other pocket of the cage 20 is constantly in contact with the other rolling elements by "force of a constant direction and magnitude". This allows the cage 20 to maintain a stable posture. Therefore, the cage 20 relatively smoothly rotates without whirling.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications can be made. For example, although the sliding contact portion is formed on the inner surface of one pocket in the above-described embodiment, the sliding contact portion may be formed on the inner surface of some pockets. Further, the present invention can be applied to not only ball bearings but also roller bearing cages. In addition, one sliding contact portion is formed on each side of the rolling element, or two or more divided sliding contact portions may be formed on both sides of the rolling element. Further, the sliding contact portions may be formed on both the front and rear sides of the pocket as well as on the left and right sides thereof so as to sandwich the rolling elements from both sides in the axial direction. Further, the present invention can be applied not only to the crown type retainer but also to a normal type retainer in which the pocket is not opened, and in that case, it is difficult to apply elastic force to the sliding contact portion by the pocket partition wall. Therefore, an elastic member may be lined in the sliding contact portion with the rolling element, or an elastic member layer may be interposed between the sliding contact portion and the inner peripheral surface of the pocket.

[0014]

[Effect of the device]

 In the present invention, since the cage pocket elastically restrains the rolling elements as described above, the total of six cage directions in the X, Y, and Z axes and the three rotational directions about these three axes are provided. Of the two degrees of freedom, movement in the X, Y, and Z axis directions is restricted. Therefore, the conventional whirling of the cage can be prevented, and the generation of cage noise can be suppressed. Also, since only one or a few pockets restrain the rolling elements, there is no risk of cage "caulging" due to cage deformation or variation in accuracy.

[Brief description of drawings]

1 (b) is a plan view of a cage according to an embodiment of the present invention, (a) is a sectional view taken along the line aa of (b), and (c) is (a).
6 is a cross-sectional view taken along the line c-c, and (d) is an enlarged view of the pocket.

2B is a plan view of a cage according to a modified example of the present invention, FIG. 2A is a sectional view taken along line aa of FIG. 2B, and FIG.
6 is a cross-sectional view taken along the line c-c, and (d) is an enlarged view of the pocket.

FIG. 3 is a perspective view for explaining movement of a conventional cage.

FIG. 4A is a side view for explaining the movement of the cage, and FIGS. 4B and 4C are enlarged views of pockets for explaining the action of the rolling elements.

[Explanation of symbols]

 20, 40 Retainer 22 Pocket 24 Rolling body 26, 42 Sliding contact portion 30 Opposing surface

Claims (1)

[Scope of utility model registration request] 1. A rolling bearing in which one or several pockets of a cage for accommodating a rolling element of a rolling bearing have a sliding contact portion facing the surface of the rolling element, which is in elastic contact with the surface of the rolling element. Retainer.