JP2010048301A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device capable of stably maintaining bearing performance over a long period, by surely preventing the occurrence of a creep even under a severe service condition. <P>SOLUTION: This bearing device 100 has an inner ring 11, an outer ring 12, a rolling bearing 10 having a plurality of rolling elements 13, a shaft 30 fitted to the inner ring 11, and a housing 20 in which the outer ring 12 is fitted. An engaging groove extending in the axial direction is respectively formed on at least one opposed surface between the outer ring 12 and the housing 20 and between the inner ring 11 and the shaft 30, and key members 26 and 36 are fitted to and inserted into engaging holes 25 and 35 constituted by putting mutual these engaging grooves together. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bearing device, and more particularly to a bearing device that supports, for example, a rotating portion of an automobile transmission and includes a creep prevention mechanism.

  In a rolling bearing to which a large load is applied, a so-called creep may occur in which the stationary wheel and the housing or the shaft rotate relative to each other with the rotation. When creep occurs, the mating surface between the stationary wheel and the housing or the shaft may be worn and the function of the rolling bearing may be impaired. For example, if creep occurs on the mating surface between the housing and the outer ring, abnormal wear may occur on the inner peripheral surface of the housing and the outer ring, particularly on the inner peripheral surface of the housing that is generally low in hardness. Roughness, abnormal noise, vibration, seizure, etc. were generated, causing the performance of rolling bearings to deteriorate.

As a conventional technique for preventing the occurrence of such an outer ring creep, an eccentric circumferential groove is provided on the outer circumferential surface of the outer ring, and a substantially arc-shaped retaining ring having elasticity is fitted into the eccentric circumferential groove and fitted into the housing to be stopped. An anti-creep bearing has been proposed in which relative rotation (creep) between the outer ring and the housing is prevented by the elastic force of the ring (see, for example, Patent Document 1).
JP 2007-162870 A

  However, the anti-creep bearing described in Patent Document 1 has a wedge action in which the end of the retaining ring enters between the housing and the outer ring due to the frictional force due to the elastic force of the retaining ring or when the housing and the outer ring rotate to some extent. However, when it is used under severe use conditions, creep cannot always be sufficiently prevented, and creep may occur.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a bearing device that can reliably prevent the occurrence of creep even under severe use conditions and can stably maintain bearing performance for a long period of time. It is to provide.

The above object of the present invention can be achieved by the following constitution.
(1) An inner ring having an inner ring raceway on an outer peripheral surface, an outer ring having an outer ring raceway on an inner peripheral surface, and a plurality of rolling elements provided in a freely rollable manner between the inner ring raceway and the outer ring raceway. In a bearing device comprising a rolling bearing, a shaft fitted to the inner ring, and a housing to which the outer ring is fitted,
Engaging grooves extending in the axial direction are formed on at least one opposing surface between the inner ring and the shaft and between the outer ring and the housing,
A bearing device, wherein a key member is inserted into an engagement hole formed by aligning the engagement grooves.
(2) A female screw part is formed in the engagement hole, a male screw part is formed in the key member, and the male screw part of the key member is screwed to the female screw part of the engagement hole. The bearing device according to (1) above.
(3) The bearing device according to (1), wherein the engagement grooves are formed obliquely with respect to the axial direction.

  According to the bearing device of the present invention, the engagement grooves extending in the axial direction are formed on at least one of the opposing surfaces between the inner ring and the shaft and between the outer ring and the housing, and the engagement grooves are aligned with each other. Since the key member is inserted into the engagement hole formed by the above, even under severe conditions, relative rotation between the inner ring and the shaft, or between the outer ring and the housing does not occur, ensuring the occurrence of creep Can be prevented.

  Further, if the female screw portion is formed in the engagement hole and the male screw portion is formed in the key member and the male screw portion is screwed to the female screw portion, the occurrence of creep can be surely prevented. Furthermore, since the male thread portion which is a key member can be easily removed, there is an advantage that the maintainability of the bearing is improved.

  Further, if the engagement groove is formed obliquely with respect to the axial direction, the engagement area with the key member can be increased, and the occurrence of creep can be reliably prevented even with a larger load. .

Hereinafter, each embodiment of the bearing device according to the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a longitudinal sectional view of a bearing device according to a first embodiment of the present invention, and FIG. 2 is a perspective view of the rolling bearing in FIG.

  As shown in FIGS. 1 and 2, the bearing device 100 includes a single row deep groove ball bearing 10, which is an example of a rolling bearing, a housing 20, and a shaft 30. The single row deep groove ball bearing 10 is fitted in a housing hole 21 formed in the housing 20, and the shaft 30 is fitted in the inner ring 11 of the single row deep groove ball bearing 10.

  The single row deep groove ball bearing 10 is rotatably provided between an inner ring 11 having an inner ring raceway 11a on an outer peripheral surface, an outer ring 12 having an outer ring raceway 12a on an inner peripheral face, and the inner ring raceway 11a and the outer ring raceway 12a. A plurality of balls 13 that are rolling elements, a holder 14 that rotatably holds the balls 13 at predetermined intervals in the circumferential direction, and sealing devices 15 that are respectively fixed to both ends of the outer ring 12 in the axial direction. It is equipped with.

  On the inner peripheral surface 11b of the inner ring 11, an inner ring engaging groove 16 having a substantially semicircular cross section that forms an inner ring side engaging hole 35 in cooperation with a shaft engaging groove 31 described later is formed along the axial direction. ing. Further, an outer ring engagement groove 17 having a substantially semicircular cross section that forms an outer ring side engagement hole 25 in cooperation with a housing engagement groove 23 described later is formed on the outer peripheral surface 12b of the outer ring 12 along the axial direction. Has been.

  A housing hole 21 having an inner diameter substantially the same as the outer diameter of the outer ring 12 of the single row deep groove ball bearing 10 is formed in the housing 20. A housing engagement groove 23 having a substantially semicircular cross section that forms part of the outer ring side engagement hole 25 is formed in the housing hole 21 along the axial direction.

  A shaft engagement groove 31 having a substantially semicircular cross section that forms a part of the inner ring side engagement hole 35 is formed on the outer peripheral surface of the shaft 30 along the axial direction.

  In the single row deep groove ball bearing 10, the outer ring 12 is fitted in the housing hole 21 in a state where the phases of the outer ring engaging groove 17 and the housing engaging groove 23 are matched. A key member 26 is fitted in the axial direction in an outer ring side engagement hole 25 having a substantially circular cross section formed by the outer ring engagement groove 17 and the housing engagement groove 23 along the axial direction.

  The shaft 30 is fitted to the inner ring 11 in a state where the phases of the shaft engaging groove 31 and the inner ring engaging groove 16 are matched. A key member 36 is inserted in the axial direction into an inner ring side engagement hole 35 having a substantially circular cross section formed in the axial direction by the shaft engagement groove 31 and the inner ring engagement groove 16.

  As described above, in the bearing device 100 of the present embodiment, the key members 26 and 36 are inserted in the axial direction between the outer ring 12 and the housing 20 and between the inner ring 11 and the shaft 30, respectively. As a result, the outer ring 12 and the housing 20 and the inner ring 11 and the shaft 30 do not rotate relative to each other, and the occurrence of creep is reliably prevented. In addition, the performance of the bearing device 100 is thereby stably maintained over a long period.

(Second Embodiment)
Next, a bearing device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a longitudinal sectional view of the bearing device of the second embodiment. The bearing device of the second embodiment is the same as the bearing device of the first embodiment except that a female screw portion is formed in the engagement hole and a male screw portion is formed in the key member. The description is simplified or omitted with reference numerals or equivalent signs.

  The bearing device 100 according to the second embodiment includes an inner ring side engagement hole 35 formed between the inner ring 11 and the shaft 30 and an outer ring side engagement hole 25 formed between the outer ring 12 and the housing 20. Female thread portions 51 and 52 are respectively formed. The key members 26 and 36 are formed with male screw portions 53. The key members 26 and 36 are fixed to the outer ring side engagement hole 25 and the inner ring side engagement hole 35 by screwing the male screw part 53 on the female screw parts 51 and 52.

  According to the bearing device of the present embodiment, since the inner ring 11 and the shaft 30 and the outer ring 12 and the housing 20 are fixed by screws, the relative rotation is reliably prevented and the occurrence of creep is prevented. Further, since the key members 26 and 36 are male threaded portions 53, they can be removed from the outer ring side engagement hole 25 and the inner ring side engagement hole 35 by rotating, and maintenance such as disassembly of the bearing device 100 is easy. It becomes.

(Third embodiment)
Next, a bearing device according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a perspective view of a rolling bearing used in the bearing device of the third embodiment. The bearing device of the third embodiment is the same as the bearing device of the first embodiment except that the grooves formed in the inner ring, the outer ring, the housing, and the shaft are formed obliquely with respect to the axial direction. Therefore, the same parts are denoted by the same or corresponding reference numerals, and the description thereof is simplified or omitted. The overall configuration of the bearing device will be described with reference to FIG. 1 having a similar structure.

  As shown in FIG. 4, in the rolling bearing 10 of the third embodiment, an inner ring engaging groove 16 </ b> A is formed on the inner peripheral surface 11 b of the inner ring 11 at a predetermined angle with respect to the axial direction. An outer ring engaging groove 17A is formed on the outer peripheral surface 12b of the outer ring 12 at a predetermined angle with respect to the axial direction. Referring to FIG. 1, shaft engagement groove 31 and housing engagement groove 23 are formed in shaft 30 and housing hole 21 of housing 20 so as to face inner ring engagement groove 16A and outer ring engagement groove 17A, respectively. The inner ring engaging groove 16A and the outer ring engaging groove 17A are inclined at the same angle with respect to the axial direction.

  When the outer ring 12 is fitted into the housing hole 21, a key member 26 is formed in the outer ring side engagement hole 25 formed obliquely with respect to the axial direction by the outer ring engagement groove 17 </ b> A and the housing engagement groove 23. Is inserted. Further, when the shaft 30 is fitted into the inner ring 11, the key member 36 is provided in the inner ring side engagement hole 35 formed obliquely with respect to the axial direction by the inner ring engagement groove 16 </ b> A and the shaft engagement groove 31. Is inserted.

  In the bearing device 100 of the present embodiment, the inner ring engaging groove 16A (inner ring side engaging hole 35) and the outer ring engaging groove 17A (outer ring side engaging hole 25) are formed obliquely with respect to the axial direction. Compared with the bearing device 100 of the first embodiment, the locking length by the key members 26 and 36 can be increased. As a result, a larger load can be endured, the creep resistance performance is improved, and the occurrence of creep is prevented even under severe use conditions.

  In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. For example, the location where the engagement hole into which the key member is inserted can be selected as appropriate according to the usage conditions of the bearing device, and is provided only in one between the outer ring and the housing and between the inner ring and the shaft. It may be provided at a plurality of locations. In addition, although the engaging groove has been described as having a semicircular cross section, it is also possible to use an engaging groove having an arbitrary cross sectional shape and a key member having a corresponding cross sectional shape.

  In the present invention, the rolling bearing has been described as a single-row deep groove ball bearing. However, the present invention is not limited to this, and is not limited to this. An angular ball bearing, a self-aligning ball bearing, a cylindrical roller bearing, a tapered roller bearing, a needle roller The present invention can be widely applied to other types of rolling bearings such as a bearing.

1 is a longitudinal sectional view of a bearing device according to a first embodiment of the present invention. It is a perspective view of the rolling bearing in FIG. It is a longitudinal cross-sectional view of the bearing apparatus which concerns on 2nd Embodiment of this invention. It is a perspective view of the rolling bearing which concerns on 3rd Embodiment of this invention.

Explanation of symbols

10 Single-row deep groove ball bearings (rolling bearings)
DESCRIPTION OF SYMBOLS 11 Inner ring 11a Inner ring track 11b Inner peripheral surface 12 Outer ring 12a Outer ring track 12b Outer peripheral surface 13 Ball (rolling element)
20 Housing 25 Outer ring side engagement hole 26 Key member 30 Shaft 35 Inner ring side engagement hole 36 Key member 51 Female thread part 52 Female thread part 53 Male thread part 100 Bearing device

Claims (3)

A rolling bearing comprising: an inner ring having an inner ring raceway on an outer peripheral surface; an outer ring having an outer ring raceway on an inner peripheral surface; and a plurality of rolling elements provided in a freely rollable manner between the inner ring raceway and the outer ring raceway. In a bearing device comprising: a shaft fitted to the inner ring; and a housing to which the outer ring is fitted,
Engaging grooves extending in the axial direction are formed on at least one opposing surface between the inner ring and the shaft and between the outer ring and the housing,
A bearing device, wherein a key member is inserted into an engagement hole formed by aligning the engagement grooves.   The internal thread portion is formed in the engagement hole, the external thread portion is formed in the key member, and the external thread portion of the key member is screwed to the internal thread portion of the engagement hole. The bearing device described.   The bearing device according to claim 1, wherein the engaging grooves are formed obliquely with respect to the axial direction.

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