JP2008069904A - Tapered roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent edge contact and improve durability, by putting a guide surface of each pillar portion of a retainer into a line contact with the rolling surface of the tapered rollers. <P>SOLUTION: In a tapered roller bearing 10, each pillar portion 21 of the retainer 20 keeps the guide surface 23 that contacts the rolling surface 13a of the tapered roller 13 facing each pocket portion 22. The guide surface 23 of each pillar portion 21 is structured with a curved surface having a predetermined curvature. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tapered roller bearing in which a plurality of tapered rollers which are rotatably held in a cage are incorporated between raceway surfaces formed on an outer ring and an inner ring, and more specifically, to improve durability. Concerning structure.

Conventionally, tapered roller bearings are known (for example, see Patent Document 1).
FIG. 7 is a cross-sectional view of a main part showing the roller bearing device disclosed in Patent Document 1, and FIG. 8 is a cross-sectional view taken along the arrow V in FIG. 9 is an enlarged cross-sectional view of the main part of a conventional tapered roller bearing, and FIGS. 10A and 10B are enlarged cross-sectional views of the main part showing the displacement of the retainer of the tapered roller bearing in FIG. is there.

  Referring to FIGS. 7 and 8, the roller bearing device 100 includes a tapered roller 103 disposed between an outer ring 101 and an inner ring 102 so as to be freely rollable by a cage 104.

  The cage 104 includes a ring-shaped portion 104b and a plurality of column portions 104a extending from the ring-shaped portion 104b in the axial direction and in the radial direction. The retainer 104 is held in a floating state between the outer ring 101 and the inner ring 102 by bringing the guide surface 104 c formed on the pillar portion 104 a into contact with the rolling surface of the tapered roller 103.

The guide surface 104 c of the pillar portion 104 a of the cage 104 is configured by a plane having a predetermined angle for guiding the tapered roller 103. Therefore, as shown in FIG. 8, the pillar portion 104a of the cage 104 has a polygonal shape in a sectional view combining a plurality of planes.
JP 2003-28165 A (second page, FIGS. 4 and 5)

  In the conventional roller bearing device 100 described above, the pillar portion 104a of the cage 104 is formed in a polygonal shape in a sectional view combining a plurality of planes as shown in FIG. Exists.

  Here, referring to FIGS. 9 and 10, for example, when used in an automobile transmission, the cage 104 is within a movable range due to a gap between the cage 104 and the tapered roller 103 when the bearing operation is stopped. The inner weight is displaced by its own weight (see FIG. 10A → FIG. 10B).

  When the bearing operation is started from the state shown in FIG. 10B, the cage 104 swings until it settles in the neutral position. At this time, the corner portion of the column portion 104a and the tapered roller 103 roll. Edge contact with the surface occurs (for example, in a circle in FIG. 10). In particular, in an environment where the operation and stoppage of the bearing are frequently repeated, there is a problem that the durability of the bearing is greatly reduced.

  The present invention provides a tapered roller bearing that can prevent edge contact by making contact between the guide surface of each column portion of the cage and the rolling surface of the tapered roller as line contact, thereby improving durability. It is intended to provide.

  The above object of the present invention is achieved by the following configurations.

(1) In a tapered roller bearing formed by incorporating a plurality of tapered rollers which are rotatably held in a cage between raceway surfaces formed on an outer ring and an inner ring,
The cage is formed between an annular portion, a plurality of annular portions with a predetermined interval in the circumferential direction, each provided along the axial direction, and between each pillar portion, and rolls a tapered roller. With pockets to hold freely,
Each of the column portions is provided with a guide surface that contacts the rolling surface of the tapered roller, and the guide surface has a predetermined curvature.

  (2) The tapered roller bearing according to (1), wherein the guide surface of each column portion of the cage is configured by a curved surface having a predetermined curvature.

  (3) The tapered roller bearing according to (1), wherein the guide surface of each column portion of the cage is configured by a combination of a curved surface having a predetermined curvature and a flat surface.

  (4) The radius of curvature of the guide surface of each column portion of the cage does not cause per edge contact with the tapered roller in a state where the cage is displaced to the innermost diameter side within a movable range due to a gap with the tapered roller. The tapered roller bearing according to (1), (2) or (3), wherein the tapered roller bearing is set to a value.

  (5) The curvature radius of the guide surface of each column part of the cage is set so that the tangent angle at the end point of curvature is 90 ° or less with respect to the width direction of the column part ( 4) The tapered roller bearing described.

  In the tapered roller bearing described in the above (1), the contact between the guide surface having a predetermined curvature of each column portion of the cage and the rolling surface of the tapered roller is a line contact and does not occur per edge. As a result, the durability of the bearing is improved and the service life is extended.

  In the tapered roller bearing described in the above (2), the contact between the guide surface formed of a curved surface having a predetermined curvature of each column portion of the cage and the rolling surface of the tapered roller is a line contact, and per edge occurs. Absent. As a result, the durability of the bearing is improved and the service life is extended.

  In the tapered roller bearing described in the above (3), the contact between the guide surface formed by a combination of a curved surface having a predetermined curvature and a flat surface of each column portion of the cage and the rolling surface of the tapered roller is a line contact. No edge per edge occurs. As a result, the durability of the bearing is improved and the service life is extended.

  In the tapered roller bearing described in (4), for example, when the bearing operation is stopped, each column of the cage is maintained even when the cage is displaced to the innermost diameter side within a movable range due to a gap between the cage and the tapered roller. The contact between the guide surface of the part and the rolling surface of the tapered roller is a line contact, and no edge contact occurs. As a result, the durability of the bearing is improved and the service life is extended.

  In the tapered roller bearing described in the above (5), the cage can be easily punched at the time of press molding, the manufacture of the cage is facilitated, and the manufacturing cost of the bearing is reduced.

  According to the tapered roller bearing of the present invention, the contact between the guide surface of each column portion of the cage and the rolling surface of the tapered roller can be prevented as a line contact to prevent edge contact, thereby improving durability. Can do.

  The tapered roller bearing obtained by the present invention is used in automobiles, industrial machines, and the like, and is particularly suitable for use in a gear device for automobile transmissions when high durability and high load resistance are required.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a main part showing a tapered roller bearing according to a first embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are views showing the displacement of the retainer of the tapered roller bearing of FIG. FIGS. 3A and 3B are schematic cross-sectional views showing the manufacturing process of the tapered roller bearing retainer of FIG.

  Referring to FIGS. 1 and 2, the tapered roller bearing 10 according to the first embodiment includes a plurality of rolling roller bearings 10 held between the raceways 11a and 12a formed on the outer ring 11 and the inner ring 12, respectively. The tapered roller 13 is incorporated.

  The retainer 20 includes an annular portion (not shown) and a plurality of annular portions that are spaced in the circumferential direction (left-right direction in FIG. 1) in the circumferential direction (each perpendicular to the paper surface in FIG. 1). It has the column part 21 provided, and the pocket part 22 which is formed between each column part 21, and hold | maintains the tapered roller 13 so that rolling is possible.

  Each column portion 21 is formed with a guide surface 23 that contacts the rolling surface 13 a of the tapered roller 13 so as to face each pocket portion 22. Each guide surface 23 of each column portion 21 is formed of a curved surface having a predetermined curvature.

  As shown in FIGS. 3A and 3B, the cage 20 is formed by metal press molding using a mold 30.

  At this time, the radius of curvature of the guide surface 23 of each column portion 21 causes per edge of the tapered roller 13 in a state where the cage 20 is displaced to the innermost diameter side within the movable range due to the gap with the tapered roller 13. Not set to a value. Thereby, the durability of the tapered roller bearing 10 is improved and the life is extended.

  Moreover, the curvature radius of the guide surface 23 of each column part 21 is set so that the tangent angle α at the curvature end point of the guide surface 23 is 90 ° or less (α ≦ 90 °) with respect to the width direction of the column part 21. Is done. As a result, it becomes easy to punch the cage 20 at the time of press molding, the manufacture of the cage 20 is facilitated, and the manufacturing cost of the tapered roller bearing 10 is reduced.

  Note that the cage 20 can also be formed by injection molding of synthetic resin, not by metal press molding by the mold 30.

The operation of this embodiment will be described.
In the tapered roller bearing 10 as described above, when the operation is stopped, the cage 20 is within the movable range due to the gap between the cage 20 and the tapered roller 13, and the inner diameter side of the cage 20 from the state shown in FIG. 2B, the guide surface 23 of each column portion 21 of the cage 20 and the rolling surface 13a of the tapered roller 13 are in line contact (point contact in the cross-sectional view shown in FIG. (Refer to the circle). When the operation is started again from this state, edge contact is prevented by the line contact between the guide surface 23 of each column portion 21 of the cage 20 and the rolling surface 13a of the tapered roller 13.

  FIG. 4 is a cross-sectional view of a main part showing a tapered roller bearing according to a second embodiment of the present invention.

Referring to FIG. 4, in the tapered roller bearing 40 of the second embodiment, the guide surface 43 of each column portion 42 of the cage 41 is configured by a combination of a curved surface portion 43a and a flat surface portion 43b. The curved surface portion 43a is formed continuously at both ends of the flat surface portion 43b in a sectional view, and is formed of a curved surface having a predetermined curvature.
Other configurations and operations are the same as those in the first embodiment.

  FIG. 5 is a cross-sectional view of a main part showing a tapered roller bearing according to a third embodiment of the present invention.

Referring to FIG. 5, in the tapered roller bearing 50 of the third embodiment, the cage 51 has a curvature radius of the guide surface 53 of each column portion 52 and a movable range due to the gap between the cage 51 and the tapered roller 13. It is set to the maximum value that does not cause contact with the tapered roller 13 in a state of being displaced to the innermost diameter side.
Other configurations and operations are the same as those in the first embodiment.

  As described above, according to the above embodiments, the guide surfaces 23, 43, 53 that come into contact with the rolling surfaces 13 a of the tapered rollers 13 in the column portions 21, 42, 52 of the cages 20, 41, 51 are predetermined. The curved surface (first and third embodiments) or the curved surface portion 43a and the flat surface portion 43b (second embodiment) having the above curvature.

  Therefore, when the operation of the tapered roller bearings 10, 40, 50 is stopped, the cages 20, 41, 51 are within the movable range due to the gap between the cages 20, 41, 51 and the tapered rollers 13, and the inner diameter side of the cages 20, 41, 51 due to their own weight. The contact between the guide surfaces 23, 43, 53 of the pillars 21, 42, 52 of the cages 20, 41, 51 and the rolling surface 13a of the tapered roller 13 can be made to be a line contact even in the state of being displaced to the right. , Edge hitting can be prevented. Thereby, the durability of the tapered roller bearings 10, 40, 50 can be improved, and the life can be extended.

  Further, in the cages 20, 41, 51, guide surfaces 23, 53 (first and third embodiments) configured by curved surfaces, or guide surfaces 43 (second embodiment) configured by a curved surface portion 43a and a flat surface portion 43b. According to the embodiment, the circumferential clearance of the pocket portion 22 of the cage 20, 41, 51 is ensured without reducing the widthwise dimension of the column portions 21, 42, 52 of the cage 20, 41, 51. be able to. As a result, the roller filling rate can be improved as compared with the guide surface of the pillar portion of the cage having a general size as shown in FIGS. Capacity can be improved.

  Referring to FIG. 6, in a case of a tapered roller bearing of a general size used in an automobile transmission, a cross-section of a cage column 21 having a guide surface 23 formed of a curved surface according to the first embodiment. It is as shown in the drawing when comparing the cross section of the pillar portion 61 of the cage having the guide surface 62 configured as a conventional plane.

  That is, even when the curvature that is the maximum area that can be manufactured is set on the curved surface of the guide surface of each pillar portion of the cage, the guide surface 23 configured by the curved surface of the first embodiment is a guide surface configured by a plane. It becomes possible to make the cross-sectional area of the column part 21 smaller than 62. Thereby, the weight of the cage can be reduced, and the torque can be reduced.

  Furthermore, according to the third embodiment, the cross-sectional area of the column portion 52 of the cage 51 can be reduced to a minimum while preventing the edge contact between the cage 51 and the tapered roller 13. As a result, the weight of the cage 51 can be further reduced, and the torque of the tapered roller bearing 50 can be further reduced.

It is principal part sectional drawing which shows the tapered roller bearing which is 1st Embodiment of this invention. It is a principal part expanded sectional view which shows the displacement of the retainer of the tapered roller bearing of FIG. It is a schematic sectional drawing which shows the manufacturing process of the retainer of the tapered roller bearing of FIG. It is principal part sectional drawing which shows the tapered roller bearing which is 2nd Embodiment of this invention. It is principal part sectional drawing which shows the tapered roller bearing which is 3rd Embodiment of this invention. Outline of main part for comparing columnar cross section of cage having guide surface configured by curved surface of first embodiment and column cross section of cage having guide surface configured by conventional plane FIG. It is principal part sectional drawing which shows the roller bearing apparatus currently disclosed by patent document 1. FIG. It is V arrow sectional drawing of FIG. It is a principal part expanded sectional view of the conventional tapered roller bearing. It is a principal part expanded sectional view which shows the displacement of the retainer of the tapered roller bearing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tapered roller bearing 11 Outer ring 12 Inner ring 13 Tapered roller 13a Rolling surface 20 Cage 21 Pillar part 22 Pocket part 23 Guide surface 40 Tapered roller bearing 41 Cage 42 Pillar part 43 Guide surface 43a Curved part 43b Plane part

Claims (5)

In a tapered roller bearing formed by incorporating a plurality of tapered rollers that are rotatably held in a cage between raceway surfaces formed respectively on an outer ring and an inner ring,
The cage is formed between an annular portion, a plurality of annular portions with a predetermined interval in the circumferential direction, each provided along the axial direction, and between each pillar portion, and rolls a tapered roller. With pockets to hold freely,
Each of the column portions is provided with a guide surface that contacts the rolling surface of the tapered roller, and the guide surface has a predetermined curvature.   The tapered roller bearing according to claim 1, wherein the guide surfaces of the pillar portions of the cage are each configured by a curved surface having a predetermined curvature.   2. The tapered roller bearing according to claim 1, wherein the guide surfaces of the pillar portions of the cage are each composed of a combination of a curved surface having a predetermined curvature and a flat surface.   The radius of curvature of the guide surface of each column of the cage is set to a value that does not cause edge contact with the tapered roller in a state where the cage is displaced to the innermost diameter side within a movable range due to a gap with the tapered roller. The tapered roller bearing according to claim 1, 2, or 3.   The radius of curvature of the guide surface of each column portion of the cage is set so that a tangential angle at the end point of curvature is 90 ° or less with respect to the width direction of the column portion. Tapered roller bearings.

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