JP2009174556A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device capable of effectively preventing abnormal abrasion and abnormal noise generated between an outer ring and a housing and capable of reducing the manufacturing cost. <P>SOLUTION: This rolling bearing device 10 comprises a rolling bearing 20, in which a plurality of rolling bodies 23 are rotatably arranged between an outer ring 21 and an inner ring 22, and a housing 30, in which the outer ring 21 of the rolling bearing 20 is fitted for fixation. In the case wherein a bearing load Fr of the rolling bearing 20 is applied to the housing 30 in a constant direction, a peripheral groove 25 extending in the circumferential direction is partially provided in a part of a fitting surface 30a of the housing 30 fitted to the outer ring 21, in which the bearing load Fr is applied. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing device, and more particularly to a rolling bearing device used for a rotation support portion of a transmission or a machine tool of an automobile.

  2. Description of the Related Art As a rolling bearing device used in a rotation support portion of an automobile transmission, machine tool, or the like, there is one in which an inner ring of a rolling bearing is fitted and fixed to a rotating shaft, and an outer ring is fitted and fixed to a housing.

  In such a rolling bearing device, if the inner ring rotates with a radial load applied to the rolling bearing, the outer ring may creep (rotate) on the inner peripheral side of the housing. Slip occurs on the mating surface between the outer ring and the outer ring. This slipping becomes more prominent as the radial load becomes larger, causing abnormal wear between the outer ring and the housing and causing abnormal noise.

  As one of the factors affecting the outer ring creep, there is a local variation of the contact surface pressure generated at the fitting contact portion between the outer ring and the housing due to the rolling element passing. This fluctuation of the contact surface pressure is particularly noticeable in the directing portion in the direction in which the maximum rolling element load (bearing load) acts on the fitting surface between the housing and the outer ring, and the outer ring expands and contracts relative to the housing. As a result, the outer ring creeps in the circumferential direction (see, for example, Non-Patent Document 1).

  Also, a technique has been proposed in which a circumferential groove is provided on the outer peripheral surface of the outer ring over the entire circumference in order to avoid creep due to fluctuations in the surface pressure of the fitting contact portion between the outer ring and the housing (see, for example, Patent Document 1). .

NSK Technical Journal No. 680 (2006) pages 13-18 JP 2006-322579 A

  By the way, in a rolling bearing device in which the acting direction of the bearing load is constant with respect to the housing, such as a rolling bearing device used in a rotation support part of an automobile transmission or a machine tool, the fitting between the outer ring and the housing described above is performed. The surface pressure fluctuation at the joint contact portion is noticeably generated only in a part in the circumferential direction.

  However, in the above-mentioned Patent Document 1, since the peripheral groove is provided on the outer peripheral surface of the outer ring over the entire circumference, most of the peripheral groove is wasted, and the processing of the peripheral groove becomes troublesome and the manufacturing cost is reduced. It has increased.

  The present invention has been made to eliminate such inconveniences, and its purpose is to effectively prevent abnormal wear and noise generated between the outer ring and the housing, thereby reducing the manufacturing cost. It is an object of the present invention to provide a rolling bearing device that can be used.

The above object of the present invention is achieved by the following configurations.
(1) A rolling bearing in which a plurality of rolling elements are arranged so as to be able to roll in the circumferential direction between an outer ring and an inner ring, and a housing in which the outer ring of the rolling bearing is fitted and fixed. A rolling bearing device in which a bearing load acts on a housing in a fixed direction, and a circumferential groove extending in a circumferential direction is partially formed in a directing portion of the bearing load acting direction on a fitting surface with an outer ring of the housing. A rolling bearing device characterized by being provided.

  According to the rolling bearing device of the present invention, when the bearing load of the rolling bearing acts on the housing in a fixed direction, the circumferential direction is provided at the directing portion of the bearing load acting direction on the fitting surface with the outer ring of the housing. Since the circumferential groove extending in the direction is partially provided, it is possible to eliminate fluctuations in the surface pressure at the portion where the maximum rolling element load is applied at the fitting contact portion between the outer ring and the housing, thereby preventing creep of the outer ring. it can. As a result, abnormal wear and noise generated between the outer ring and the housing can be effectively prevented.

  Further, according to the rolling bearing device of the present invention, the circumferential groove provided on the fitting surface with the outer ring of the housing is not a full circumferential groove but a partial circumferential groove, so that the processing range is small, and the housing On the other hand, since the groove processing is performed, the processing becomes easy and the manufacturing cost can be reduced.

  Further, according to the rolling bearing device of the present invention, since the groove processing is not performed on the rolling bearing but on the housing, positioning in the circumferential direction when assembling the rolling bearing becomes unnecessary. Assembling property can be improved.

Hereinafter, an embodiment of a rolling bearing device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view for explaining an embodiment of a rolling bearing device according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG.

  As shown in FIGS. 1 and 2, the rolling bearing device 10 of the present embodiment includes a rolling bearing 20 and a housing 30 in which an outer ring 21 of the rolling bearing 20 is fitted and fixed. The bearing load Fr is used for an application in which the bearing load Fr acts on the housing 30 in a certain direction.

  The rolling bearing 20 rotates in a circumferential direction between an outer ring 21 having an outer ring raceway groove 21a on an inner peripheral surface, an inner ring 22 having an inner ring raceway groove 22a on an outer peripheral surface, and the outer ring raceway groove 21a and the inner ring raceway groove 22a. A plurality of rolling elements arranged in a movable manner, and a retainer for holding the plurality of rolling elements at a substantially equal interval in the circumferential direction. 22 is fitted and fixed to a rotary shaft 31 of a transmission or a machine tool of an automobile.

  In the present embodiment, the outer peripheral surface of the outer ring 21 has a uniform outer diameter without a groove, while the circumferential direction is provided at the directing portion in the acting direction of the bearing load Fr on the fitting surface 30a of the housing 30 with the outer ring 21. A circumferential groove 25 extending in the direction is partially provided. The axial width dimension X of the circumferential groove 25 is set larger than the axial width of the outer ring raceway groove 21a and smaller than the axial width of the outer ring 21, and the radial depth dimension Y is the maximum rolling element load. The dimension is set such that the outer ring 21 does not come into contact with the bottom surface of the circumferential groove 25 when the load is applied. The circumferential dimension Z of the circumferential groove 25 is set to be equal to or greater than the circumferential length (1 pitch) between the rolling elements 23 and 23. In this case, as shown in FIG. 2, it is preferable that the pitch is equal to 0.5 pitch or more evenly on both sides in the circumferential direction with the acting direction of the bearing load Fr as a boundary.

  As described above, according to the rolling bearing device 10 of the present embodiment, when the bearing load Fr of the rolling bearing 20 acts on the housing 30 in a certain direction, the fitting surface with the outer ring 21 of the housing 30. Since the circumferential groove 25 extending in the circumferential direction is partially provided in the directing portion of the bearing load Fr in the direction of action of the bearing load Fr in 30a, the portion of the portion where the maximum rolling element load is applied at the fitting contact portion between the outer ring 21 and the housing 30 is loaded. Since the variation in surface pressure can be eliminated, the outer ring 21 can be prevented from creeping. Thereby, abnormal wear and abnormal noise generated between the outer ring 21 and the housing 30 can be effectively prevented.

  Further, according to the rolling bearing device 10 of the present embodiment, the circumferential groove 25 provided on the fitting surface 30a with the outer ring 21 of the housing 30 is not a full circumferential groove but a partial circumferential groove, so that the processing range is also provided. Since it is small and the groove processing is performed on the housing 30, the processing becomes easy and the manufacturing cost can be reduced.

  Furthermore, according to the rolling bearing device 10 of the present embodiment, since the groove processing is not performed on the rolling bearing 20 but on the housing 30, positioning in the circumferential direction when the rolling bearing 20 is assembled. Can be eliminated, and the assembly of the apparatus 10 can be improved.

In addition, this invention is not limited to what was illustrated to the said one Embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in the above-described embodiment, the case where a ball bearing is used as the rolling bearing constituting the rolling bearing device is illustrated, but the present invention is not limited to this, and a cylindrical roller bearing or other rolling bearing may be used as the rolling bearing. Good.

It is sectional drawing for demonstrating one Embodiment of the rolling bearing apparatus which concerns on this invention. It is AA arrow sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rolling bearing apparatus 20 Rolling bearing 21 Outer ring 21a Outer ring raceway groove 22 Inner ring 22a Inner ring raceway groove 23 Rolling element 24 Cage 25 Circumferential groove 30 Housing 30a Fitting surface 31 Rotating shaft Fr Bearing load X Width dimension of axial direction of circumferential groove Y Depth dimension in the radial direction of the circumferential groove Z Length dimension in the circumferential direction of the circumferential groove

Claims (1)

A rolling bearing in which a plurality of rolling elements are disposed between the outer ring and the inner ring so as to be able to roll in the circumferential direction;
A housing in which the outer ring of the rolling bearing is fitted and fixed,
A rolling bearing device in which a bearing load of the rolling bearing acts in a fixed direction on the housing,
A rolling bearing device characterized in that a circumferential groove extending in a circumferential direction is partially provided in a directing portion in a direction of action of the bearing load on a fitting surface of the housing with the outer ring.

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