JP2006177511A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device capable of receiving not only a load of one of radial and thrust directions but also receiving the external force of the other direction without using a thrust washer or the like. <P>SOLUTION: In this bearing device comprising a pair of bearing rings (inner ring member 5 and outer ring member 6), and a roller 10 with a retainer 9 mounted in an annular space 7 between both bearing rings 5, 6, an extending portion 9b extending into an annular clearance 8 expanded along the direction orthogonal to the annular space 7 is formed on one end side of the retainer 9. The extending portion 9b is located between opposite faces of both bearing rings 5, 6 or between opposite faces of one of the bearing rings 5, 6 and the other member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bearing device that can receive not only a radial load and a thrust load in one direction but also an external force in the other direction.

  In general, not only a radial load but also an external force in the thrust direction acts on an inner ring and an outer ring disposed radially inward and outward via a radial bearing. When the axial end surface of the inner ring or outer ring faces a part of the other race ring or another member different from the race ring with a small gap in the axial direction, the opposite faces contact each other. Since there is a risk of sliding contact, it is necessary to interpose a thrust washer, a thrust bearing, or the like between these facing surfaces.

  For example, in a planetary gear device, a planetary gear is provided on a gear shaft protruding from a carrier via needle rollers. The gear shaft in this planetary gear mechanism corresponds to the inner ring in the above description, and the planetary gear corresponds to the outer ring. The axial end surface of the planetary gear faces the axial end surface of the carrier with a slight gap. A thrust washer is interposed between the opposing surfaces so that the planetary gear can rotate without contacting the opposing surfaces (see Patent Document 1).

By the way, in the case of using a thrust receiving dedicated component such as the thrust washer, the component cost and assembly cost are high, and it is difficult to meet the cost reduction request. In addition, when a thrust bearing is used as a thrust receiver, not only is the cost higher than that of the thrust washer, but a large mounting space is required, which makes it difficult to reduce the size.
Japanese Patent Laid-Open No. 08-170693

  The problem to be solved by the present invention is a bearing that can receive not only a radial load and a thrust load but also an external force in the other direction without using a thrust washer or other types of rolling bearings. Is to provide a device.

  A bearing device according to the present invention includes a pair of race rings and a roller with a cage disposed in an annular space between the race rings, and one end side of the annular space is disposed at one end side of the cage. An extended portion that extends into an annular gap that extends in a direction perpendicular to the annular space and is interposed between the facing surfaces of both race rings or between the facing surfaces of one race ring and another member. Is formed.

  In the above configuration, the roller with the cage may be a radial type or a thrust type. When the roller with cage is a radial type, the roller with cage is arranged and held in a cylindrical annular space between the inner ring (inner race ring) and the outer ring (outer race ring). The extending portion of the vessel extends into a disk-shaped annular gap that extends radially outward or inward continuously from the axial end of the annular space, or between the axially opposed surfaces of the inner and outer rings, or It is interposed between the opposing surfaces in the axial direction of one of the race rings and the other member.

  When the roller with cage is a thrust type, the roller with cage is arranged in a disc-shaped annular space between the inner raceway and the outer raceway, and the extension part of the cage is , Extending into a cylindrical annular gap extending in the axial direction continuously to the radial end of the annular space, between the radially opposing surfaces of both the inner and outer races, or between one race and the other member It will be interposed between opposing surfaces in the radial direction.

  According to the present invention, on one end side of the annular space where the roller with cage is arranged, the extension portion of the cage extends into an annular gap continuous with the annular space. Contact between the facing surfaces of both the inner and outer races facing each other through the annular gap or the facing surfaces of one race and another member is prevented. This eliminates the need for parts other than the roller with cage, such as a thrust washer and other types of rolling bearings, reduces the number of parts, and provides an effect that the bearing device can be manufactured at low cost.

  Further, according to the present invention, in addition to the above effect, the extension portion of the cage can be engaged with one end side of one of the races facing the annular gap. Positioning of the roller with retainer (positioning in the axial direction of a roller with a radial type retainer, positioning in the radial direction with a roller with a thrust type retainer). Therefore, the structure of a retaining ring or the like for positioning the rollers and the cage is not necessary, and the bearing device can be manufactured at low cost also from this point.

  According to the present invention, it is only necessary to interpose a roller with a cage between a pair of race rings, and without using a member other than the roller with a cage, such as a thrust washer, between the race rings or one of them. Since contact and wear between the race and other members can be prevented, the number of parts is reduced, and the bearing device can be manufactured at low cost.

  Hereinafter, a bearing device according to the best mode of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a sectional view of a planetary gear device including a bearing device of the present invention, and FIG. 2 is a perspective view of a cage of the bearing device shown in FIG.

  1, the planetary gear device includes a sun gear 1, a ring gear 2 facing the outer periphery of the sun gear 1, a planet gear 3 meshing with the sun gear 1 and the ring gear 2, and a plurality of planet gears 3, 3,. Each of them includes a carrier 4 that is rotatably held via a gear shaft 3a.

  The sun gear 1 is integrally formed on the outer periphery of the large-diameter portion 5a of the inner ring member 5 serving as an input shaft for engine power and the like. The inner ring member 5 corresponds to an inner race in the bearing device of the present invention. The ring gear 2 is integrally formed on the inner periphery of the large-diameter portion 6 a of the outer ring member 6 provided coaxially with the inner ring member 5. The outer ring member 6 is an outer race in the bearing device of the present invention. The carrier 4 is integrally provided with a rotating shaft 4a serving as an output shaft.

  Each of the inner ring member 5 and the outer ring member 6 is narrowed to a small diameter in the axial direction (the right side portion in FIG. 1), the outer peripheral surface of the small diameter portion 5 b of the inner ring member 5, and the small diameter of the outer ring member 6. A cylindrical annular space 7 is formed between the inner peripheral surface of the portion 6b. In addition, in the place where the inner ring member 5 and the outer ring member 6 are respectively narrowed to a small diameter with a step, there is a gap between the end surface of the step portion 5c of the inner ring member 5 and the end surface of the step portion 6c of the outer ring member 6. A disc-shaped annular gap 8 is formed. The annular gap 8 extends in a disk shape outwardly from the annular space 7 along the radial direction continuously to one axial end side (left end side in FIG. 1) of the annular space 7.

  The inner ring member 5 and the outer ring member 6 are made of a steel material such as bearing steel, and the entire surface or required portions thereof are hardened by heat treatment such as carburization or high-frequency heating. In particular, among the surfaces of the inner ring member 5 and the outer ring member 6, as will be described later, it is desirable that the surface on which the roller rolls and the surface on which the other member slides are polished and cured. .

  In the annular space 7, a radial type cage and roller 11 composed of rollers 10 with a cage 9 is interposed. The roller 10 of the cage and roller 11 may be a needle roller, a cylindrical roller, or a tapered roller. And the axial direction one end part (left-end part in FIG. 1) of the holder | retainer 9 is extended in radial direction outward, and this extension part 9b is extended in the annular clearance 8 from the annular space 7, It is interposed between the end surface of the step portion 5 c of the inner ring member 5 and the end surface of the step portion 6 c of the outer ring member 6. Accordingly, as clearly shown in FIG. 2, the cage 9 includes a cylindrical main portion 9a and an extending portion 9b, and the extending portion 9b extends radially outward from one axial end of the main portion 9a. It extends into a flange shape. Pockets 9c for accommodating the rollers 10 are formed in the main portion 9a at equal intervals in the circumferential direction.

  The cage 9 is formed, for example, by drawing a plate material of a copper alloy such as bronze, lead bronze, phosphor bronze, or the like, or a non-ferrous metal such as an aluminum alloy. Moreover, you may use the board | plate material which laminated | stacked the layer of the said nonferrous metal on the surface, using steel plates, such as a cold rolled steel plate and a general rolled steel plate, as a core metal. Furthermore, you may shape | mold the whole holder | retainer 9 with resin. Of the portions of the cage 9, at least the surface of the extending portion 9b is preferably a low friction layer. Examples of the material constituting the low friction layer include soft metals such as lead and copper, and fluororesins.

  In the above configuration, the small-diameter portion 6b of the outer ring member 6 is rotatably supported by the cage and roller 11 with respect to the small-diameter portion 5b of the inner ring member 5, and can receive a radial load. When the outer ring member 6 is displaced in the axial direction with respect to the inner ring member 5, the end face of the step part 6c of the outer ring member 6 is close to the end face of the step part 5c of the inner ring member 5, but is held between these both end faces. Since the extending portion 9b of the vessel 9 is interposed, the stepped portion 6c of the outer ring member 6 and the stepped portion 5c of the inner ring member 5 are not in direct contact, and the extending portion 9b is a thrust washer or a thrust type. Therefore, it is possible to prevent wear of the step portions 5c and 6c. In this case, a cage and roller 11 may be provided between the inner ring member 5 and the outer ring member 6, and members other than the cage and roller 11 are not required.

  Further, if the conventional cage and roller is disposed in the annular space 7, the cage and roller itself may be greatly displaced in the axial direction. However, in the above embodiment of the present invention, the cage Since the extending portion 9b of 9 can engage with the step portion 6c of the outer ring member 6 in the axial direction, the cage and roller 11 is positioned in the axial direction by this engagement.

  FIG. 3 is a cross-sectional view of a bearing device according to the second embodiment of the present invention. In the embodiment of FIG. 1, the annular gap 8 is formed between the inner ring member 5 and the outer ring member 6. However, as shown in FIG. 3, the annular gap 8 is positioned adjacent to the outer ring member 5 in the axial direction. When there is a member different from both the members 5 and 6 (in the illustrated example, the outer peripheral member 12 provided on the outer periphery of the shaft-shaped inner ring member 5), the axial end surface of the outer peripheral member 12 and the outer ring member 6 An annular gap 8 is formed between the end face in the axial direction. In the annular space 7 between the inner ring member 5 and the outer ring member 6, a cage and roller 11 comprising rollers 10 with cages 9 is disposed. This cage and roller 11 is the one in the embodiment of FIG. The extension portion 9b of the cage 9 extends from the axial end of the annular space 7 into the annular gap 8, and is formed between the axial end surface of the outer ring member 6 and the axial end surface of the outer peripheral member 12. Intervene in between.

  In the bearing device of this embodiment, contact between the axial end surface of the outer ring member 6 and the axial end surface of the outer peripheral member 12 and wear are prevented by the extending portion 9 b of the cage 9. Further, the cage and roller 11 is positioned in the axial direction by the extension portion 9 b of the cage 9 engaging with the axial end surface of the outer ring member 6 or contacting the outer peripheral member 12.

  4 and 5 show a third embodiment of the present invention. FIG. 4 is a cross-sectional view of a bearing device according to the third embodiment. FIG. 5 is a cage included in the bearing device of FIG. It is the perspective view shown partially notched.

  In the third embodiment, the inner ring member 51 is a shaft body whose one end in the axial direction is a cut surface, and one end in the axial direction of the outer ring member 61 has an end wall portion 61a extending radially inward. . A cylindrical annular space 7 is formed between the outer peripheral surface of the inner ring member 51 and the inner peripheral surface of the outer ring member 61, and the cage and roller 11 including the rollers 10 with the cage 9 is formed in the annular space 7. Is arranged. Between the end surface in the axial direction of the inner ring member 51 and the inner surface of the end wall portion 61a of the outer ring member 61, it is continuous from the one end side in the axial direction of the annular space 7 and inward along the radial direction from the annular space 7. An annular gap 81 extending in a disk shape is formed. In this embodiment, a cage 9 having an M-shaped cross section along the axial direction is used.

  An extension portion 9d extending inward in the radial direction is formed at one axial end of the cage 9, and this extension portion 9d extends from the annular space 7 into the annular gap 81, The inner ring member 51 is interposed between the axial end surface of the inner ring member 51 and the inner surface of the end wall portion 61 a of the outer ring member 61. Therefore, as shown in FIG. 5, the cage 9 is composed of a substantially cylindrical main portion 9a in which a pocket 9c for accommodating the roller 10 is formed, and an extending portion 9d. The main portion 9a extends in a flange shape radially inward from one axial end of the main portion 9a.

  In the bearing device of this embodiment, contact between the axial end surface of the inner ring member 51 and the inner surface of the end wall portion 61a of the outer ring member 61 and wear are prevented by the extending portion 9d of the cage 9. Further, the cage 9 and the roller 11 are positioned in the axial direction by the extension portion 9 d of the cage 9 engaging with the axial end surface of the inner ring member 5 or abutting the inner surface of the end wall portion 61 a of the outer ring member 61. Is made.

  As shown in FIG. 6, the cage 9 used in the bearing device of the third embodiment has a cylindrical main portion 9a extending straight in the axial direction and radially inward from one axial end of the main portion 9a. The thing of the shape which consists of the extension part 9d extended in a flange shape may be sufficient.

  7 and 8 show a fourth embodiment of the present invention. FIG. 7 is a sectional view of a bearing device according to the fourth embodiment. FIG. 8 is a cage included in the bearing device of FIG. FIG.

  The bearing device according to the fourth embodiment is mainly adapted to receive a thrust load, and the radial direction between the end surface of the stepped portion 5c of the inner ring member 5 and the axial end surface of the outer ring member 6 is along the radial direction. An annular space 72 extending in a disk shape is formed. Further, between the outer peripheral surface of the small-diameter portion 5 b of the inner ring member 5 and the inner peripheral surface of the outer ring member 6, it follows the radial inner end side of the annular space 72 along the axial direction from the annular space 72. An annular gap 82 that extends in a cylindrical shape is formed.

  In the annular space 72, a thrust type cage and roller 112 composed of rollers 102 with a cage 92 is interposed. The radially inner end portion of the cage 92 extends in the axial direction, and the extended portion 92f extends from the annular space 72 into the cylindrical annular gap 82, so that the small diameter portion of the inner ring member 5 is formed. It is interposed between the outer peripheral surface of 5b and the inner peripheral surface of the outer ring member 6. Accordingly, as clearly shown in FIG. 8, the cage 92 includes a disk-shaped main portion 92e and a cylindrical extending portion 92f, and the extending portion 92f extends from the radially inner end of the main portion 92e. The tube extends in the axial direction. In the main portion 92e, pockets 92g for accommodating the rollers 102 are formed at equal intervals in the circumferential direction.

  In the bearing device of this embodiment, the extension portion 92f of the cage 92 prevents contact between the outer peripheral surface of the small diameter portion 5b of the inner ring member 5 and the inner peripheral surface of the outer ring member 6, and wear of each surface. Further, the extension portion 92f of the cage 92 engages with the end surface of the outer ring member 6 in the axial direction or comes into contact with the end surface of the step portion 5c of the inner ring member 5, thereby positioning the cage and roller 112 in the axial direction. Made.

Sectional drawing of the planetary gear apparatus containing the bearing apparatus of this invention. The perspective view of the holder | retainer of the bearing apparatus shown by FIG. Sectional drawing of the bearing apparatus which concerns on 2nd Embodiment of this invention. Sectional drawing of the bearing apparatus which concerns on 3rd Embodiment of this invention. FIG. 5 is a perspective view of the cage included in the bearing device of FIG. The perspective view which notched and showed the other holder | retainer used for the bearing apparatus of FIG. Sectional drawing of the bearing apparatus which concerns on 4th Embodiment of this invention. The perspective view of the holder | retainer contained in the bearing apparatus of FIG.

Explanation of symbols

5 Inner ring member (inner race)
6 Outer ring member (outer raceway ring)
7 annular space 8 annular gap 9 cage 9b extension 10 roller 11 cage and roller

Claims (1)

A pair of races and a roller with a cage disposed in an annular space between the races,
On one end side of the cage, the ring extends continuously into one end side of the annular space and extends into an annular gap extending in a direction perpendicular to the annular space, or between the opposing surfaces of both race rings, or one of the race rings. And an extending portion is formed between the facing surfaces of the other member.
A bearing device characterized by that.

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