JPH066737U - Rolling bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce noise caused by whirling of the cage. [Structure] Six balls 1 are arranged between a raceway surface 21 of an inner ring and a raceway surface 11 of an outer ring, and are accommodated and held in a pocket 2a of a cage 2 with a pocket clearance C. The diameter DL of three balls 1L of the six balls 1 is larger than the diameter DS of the other three balls 1S. However, DL and DS
The difference between the two is as small as the diameter tolerance. The balls 1L and 1S are alternately housed in the pockets 2a of the cage 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a means for reducing whirling noise of a cage in a rolling bearing.

[0002]

[Prior art]

 In rolling bearings, the manufacturing technology has been improved so that the raceway surface of the raceway ring and the surface of the rolling elements can be made as close as possible to a perfect circle.However, the cage that holds and holds the rolling elements has a complicated shape. However, some variation in dimensional accuracy is unavoidable due to the use of resin as the forming material. For this reason, the cage pockets that house the rolling elements are provided with a clearance (pocket clearance) that takes into account variations in dimensional accuracy and dimensional changes.

[0003]

[Problems to be solved by the device]

 However, the presence of this pocket clearance also gives the cage a degree of freedom for whirling motion, and depending on the usage conditions of the bearing, noise due to whirling of the cage may be a concern.

The present invention is to prevent such whirling of the cage.

[0005]

[Means for Solving the Problems]

 According to the present invention, in a rolling bearing in which a cage holds a plurality of rolling elements arranged between the raceway surface of the inner ring and the raceway surface of the outer ring, at least one of the rolling elements has a diameter equal to that of the other rolling element. The diameter of the rolling element is different.

[0006]

[Action]

 By making the diameters of the rolling elements different from each other, the revolution speeds of the rolling elements differ from each other. The cage is constrained in the circumferential direction by the rolling elements that are delayed in revolution.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, six balls 1 are arranged between the raceway surface 21 of the inner ring and the raceway surface 11 of the outer ring, and are accommodated and held in the pocket 2 a of the cage 2 with a pocket clearance C. There is. The diameter DL of three balls 1L of the six balls 1 is larger than the diameter DS of the other three balls 1S. However, the difference between DL and DS is as small as the diameter tolerance. The balls 1L and 1S are alternately housed in the pockets 2a of the cage 2. When the inner ring rotates, the ball 1 revolves along the raceway surfaces 11 and 21 while rotating in the pocket 2a. The cage 2 rotates as the ball 1 revolves.

Since the revolution speed of the ball 1 is proportional to its diameter, the revolution speed of the ball 1L is higher than that of the ball 1S, and the revolution speed of the ball 1S is lower than that of the ball 1L. Therefore, as shown in FIG. 6B, the cage 2 rotates while being slightly restrained in the circumferential direction by the ball 1L and the ball 1S whose revolutions are delayed. By thus restraining the cage 2 with the balls 1, whirling of the cage 2 can be reduced.

In the embodiment shown in FIG. 2, the three balls 1L and the three balls 1S are accommodated in the pockets 2a of the cage 2 in an unevenly distributed manner. Similar to the one shown in FIG. 1, the cage 2 rotates while being slightly constrained in the circumferential direction by the ball 1 which is delayed in revolution. Further, in this embodiment, since the balls 1L and 1S are unevenly distributed, the cage 2 receives not only the circumferential restraining force but also the restraining force due to the centrifugal force of rotation. That is, in FIG. 2b, the force exerted by the balls 1L, 1S on the cage 2 is directed obliquely upward to the right as a whole, and the cage 2 receives this force and moves to the position indicated by the broken line in the figure. At this time, the center of the pocket of the cage 2 moves from Oc to O'c. The center of the pocket O'c deviates from the center of the bearing (at the same position as Oc), and a centrifugal force acts on the cage 2. The cage 2 is pressed against the ball 1 by this centrifugal force. Therefore, according to this embodiment, whirling of the cage 2 can be further reduced.

FIG. 3 shows a rolling bearing having the above-described structure (the rolling bearing shown in FIG. 1 is shown as bearing A and the rolling bearing shown in FIG. 2 is shown as bearing B), and the actual dimensional tolerance between balls is 0 μm. The results of testing the cage sound generation status for the bearing (shown as bearing C) are shown. As is clear from the figure, the rolling bearings A and B of the present invention maintain the normal level of the cage sound even at the time of high speed rotation as compared with the bearing C.

Note that it is possible to achieve the same effect by making the diameter of at least one of the plurality of balls different from the diameter of the other balls.

[0013]

[Effect of device]

 According to the present invention, by making the diameter of at least one ball out of the plurality of balls arranged between the raceways of the inner and outer rings different from the diameters of the other balls, a delayed revolution of the revolution of the ball is caused, As a result, the cage is restrained, so that noise due to whirling of the cage can be effectively reduced.

[Brief description of drawings]

FIG. 1 is a sectional view (FIGS. A and b) showing an embodiment of the present invention.

FIG. 2 is a sectional view (FIGS. A and b) showing another embodiment of the present invention.

FIG. 3 is a diagram showing a result of testing a state of generation of cage sound.

[Explanation of symbols]

 1 ball 1L large ball 1S small ball 2 cage DL ball diameter DS ball diameter

Claims (1)

[Scope of utility model registration request] 1. In a rolling bearing in which a plurality of rolling elements arranged between an inner ring raceway surface and an outer ring raceway surface are held by a cage, at least one of the plurality of rolling elements has a diameter of: A rolling bearing characterized by having a diameter different from that of other rolling elements.