JP2012247039A - Thrust needle bearing - Google Patents

Abstract

[PROBLEMS] To prevent wear of a mating member of a thrust needle bearing that prevents rotation by abutting a thrust trace against a mating member such as a housing even when the thrust trace repeatedly abuts against the mating member. The invention was invented to provide a thrust needle bearing.
A plurality of protrusions 8 projecting radially outward are formed on a race portion 5 of a thrust trace 4, and the protrusions 8 are flush with the race portion 5 formed by press molding. It comprises a certain convex portion 9 and a flange portion 10 formed by bending both ends in the circumferential direction, which is a fracture surface of the convex portion 9 by press molding, toward the inner cylindrical portion 6 in the axial direction.
[Selection] Figure 1

Description

  The present invention relates to a thrust needle bearing used for a rotation support portion of various mechanical devices such as an automobile transmission, a torque converter, a car air conditioner compressor, and a machine tool.

  For example, a thrust needle bearing is used between an impeller of a torque converter or between a turbine and a stator in order to support a thrust load caused by working oil flowing back between the impeller and the turbine. A stator that forms a support surface for a thrust trace of a thrust needle bearing is generally made of aluminum in order to reduce vehicle weight and fuel consumption. For this reason, in an actual vehicle usage environment, the stator support surface is worn due to the relative rotation of the stator and the thrust trace, and the wear progresses so that the dimensional relationship is lost, leading to vehicle troubles such as noise generation from the torque converter. there is a possibility.

  As a countermeasure, in the thrust needle bearing 100 applied to the torque converter as shown in FIG. 6, a plurality of anti-rotation pieces 102 are provided on the outer periphery of the thrust trace 101, and the anti-rotation pieces 102 are formed in the oil grooves 104 of the stator 103. There are those that are fitted together to prevent relative rotation of the stator 103 and the thrust trace 101 (see, for example, Patent Document 1). A cylindrical portion 105 is formed on the inner peripheral edge of the thrust trace 101, and a plurality of removals that prevent the retainer 106 from coming off by caulking outward in the radial direction at the distal end edge of the cylindrical portion 105. A pawl 107 is formed.

  Further, a cylindrical claw portion formed on the inner peripheral edge of the thrust trace is provided with a locking claw portion bent outward in the radial direction to prevent rotation with the mating member (see, for example, Patent Document 2). ) Etc. have been proposed.

  By the way, in the thrust needle bearing 100 described in Patent Document 1, the anti-rotation piece 102 is fitted in the oil groove 104 of the stator 103 in order to prevent relative rotation between the stator 103 and the thrust trace 101. Since there is a difference between the hardness and the hardness of the thrust trace 101, if the detent piece of the high-thrust thrust trace 101 is repeatedly brought into contact with the stator 103 having a low hardness, the stator 103 may be worn and the detent effect may not be exhibited. There is sex.

  In many cases, the anti-rotation piece 102 of the thrust trace 101 is formed only by press punching. In this case, in the fracture surface of the anti-rotation piece 102, the sheared portion becomes a corner, and the corner Burrs are likely to occur, and the generated burrs are likely to remain as corners even when surface smoothing treatment such as barrel treatment is performed. For this reason, it is conceivable to remove by cutting and grinding in addition to barrel processing, but the cost becomes high. Moreover, it is not easy to perform the cutting / grinding process on the rotation stopper piece 102, and a broken surface in which corner portions remain without being removed is used as a contact surface, which may further promote the wear.

JP 2003-247624 A JP 2007-040498 A

  In view of the circumstances as described above, the present invention is a thrust needle bearing that prevents rotation by bringing a thrust trace into contact with a mating member such as a housing, and the thrust trace repeatedly abuts against the mating member. The invention is also invented to provide a thrust needle bearing in which wear of the mating member is suppressed.

  In order to solve the above-mentioned problem, the thrust needle bearing according to claim 1 is provided with a plurality of needles arranged radially and a pocket that is formed in an annular shape and holds the plurality of needles so as to be freely rollable. A thrust needle bearing comprising: a retainer having at least one thrust trace provided with a race portion against which the plurality of needles abut, wherein the race end in a radial direction is provided at a radial end portion of the thrust trace. Formed on the side opposite to the portion, and provided with a protrusion that prevents rotation with respect to the mating member that supports the thrust trace, and the fracture surface of the projection of the thrust trace formed by press molding is connected to the mating member. It is characterized by not being a contact surface

  According to a second aspect of the present invention, the thrust needle bearing according to the second aspect is characterized in that the fracture surface of the projection portion of the thrust trace is not used as a contact surface with the mating member by bending the projection portion.

  The thrust needle bearing according to claim 3 is characterized in that the contact surface has a continuous shape.

  The thrust needle bearing according to claim 4 is characterized in that the contact surface has a discontinuous shape.

  According to the present invention, since the fracture surface of the protruding portion of the thrust trace does not contact the mating member, wear of the mating member is suppressed even if the mating member is repeatedly contacted.

It is a figure explaining 1st Embodiment of this invention. It is a figure explaining the thrust trace of 1st Embodiment of this invention. It is a figure explaining 2nd Embodiment of this invention. It is a figure explaining 3rd Embodiment of this invention. It is a figure explaining 4th Embodiment of this invention. It is a figure explaining the conventional thrust bearing.

  FIG. 1 shows a thrust needle bearing 1 according to a first embodiment of the present invention. In the present embodiment, the thrust needle bearing 1 includes a plurality of needles 2 arranged in a radial direction, a cage 3 that is formed in an annular shape and holds the plurality of needles 2 in a freely rolling manner, and a plurality of needles. And a thrust trace 4 for clamping 2 from the axial direction.

  The thrust trace 4 includes an annular race portion 5 with which a plurality of rollers 2 abut, and an inner cylindrical portion 6 formed on the inner periphery of the race portion 5 over the entire circumference. The thrust trace 4 is supported by the mating member 7. The thrust trace 4 abuts the back surface of the race portion 5 on the opposing surface 7 a of the mating member 7, and the inner cylindrical portion on the annular shaft portion 7 b of the mating member 7. 6 is fitted.

  Further, as shown in FIG. 2, the race portion 5 of the thrust race 4 has a plurality of (three in the present embodiment) projections protruding in the radial direction opposite to the inner cylindrical portion 6, that is, radially outward. 8 is formed, and the protrusion 8 has a convex portion 9 that is coplanar with the race portion 5 formed by press molding, and both ends in the circumferential direction that are fracture surfaces of the convex portion 9 by press molding. It consists of mutually discontinuous flange portions 10 formed by bending toward the inner cylindrical portion 6 in the direction. The protrusion 8 is fitted into a groove 7c formed in the mating member 7 with a predetermined circumferential width, and the flange 10 and the groove 7c come into contact in the circumferential direction, so that the thrust trace 4 Is prevented from rotating with respect to the mating member 7. Furthermore, a plurality of (three in this embodiment) locking claws 11 projecting outwardly by caulking are formed on the free end 6a of the inner cylindrical portion 6 of the thrust trace 4, and this The locking claw portion 11 abuts on the inner diameter side surface of the cage 3 and functions as a retainer for the cage 3.

  The thrust trace 4 can be made by subjecting a case-hardened steel such as an SCM material to carbonitriding, or SK85 (JIS G 4401), which is a carbon tool steel, and the like. Further, if the thickness of the thrust trace 4 is thinner than 0.6 mm, the rigidity of the convex portion 9 as a rotation stopper is insufficient, and if it is thicker than 3 mm, it becomes difficult to process during press molding. It is preferable to do this.

  According to the thrust needle bearing 1 of the embodiment, the race portion 5 of the thrust trace 4 is formed with the projection portion 8 protruding outward in the radial direction and having a predetermined circumferential width, and the flange portion of the projection portion 8. 10 has a function of contacting the opposing member 7 supporting the thrust trace 4 in the circumferential direction and preventing the thrust trace 4 from rotating relative to the opposing member 7. Thereby, since the fracture surface of the protrusion 8 of the thrust trace 4 does not come into contact with the mating member 7, the wear of the mating member 7 is suppressed even if the mating member 7 is repeatedly contacted.

  Next, FIG. 3 shows the thrust trace 4 of the thrust needle bearing 1 according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the part equivalent to embodiment of 1st example, and description is abbreviate | omitted or simplified.

  In the thrust trace 4 of the thrust needle bearing 1 according to the embodiment of the second example of the present invention, as compared with the embodiment of the first example, not only both ends in the circumferential direction, which is a fracture surface by press molding of the convex portion 9, The radially outer side is also bent to form a flange portion 12 that is continuous over the entire circumference of the convex portion 9.

  As described above, in the embodiment of the second example of the present invention, the protrusion 13 of the thrust trace 4 is formed as a continuous flange 12 over the entire circumference of the protrusion 9, thereby Compared to the embodiment, the protrusion 13 can be further improved in rigidity.

  Next, FIG. 4 shows the thrust trace 4 of the thrust needle bearing 1 according to the third embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the part equivalent to embodiment of 1st example, and description is abbreviate | omitted or simplified.

  In the thrust trace 4 of the thrust needle bearing 1 according to the third example embodiment of the present invention, the protrusions 14 are formed in a substantially triangular shape as compared to the first example embodiment.

  In this embodiment, the convex part 15 is formed into a shape as shown in FIG. 4B by press molding, and the flange part 16 is formed by bending both circumferential ends of the convex part 15 into a square shape. The protrusion 14 has a shape as shown in FIG.

  Thus, in the third example embodiment of the present invention, the protrusion 14 of the thrust trace 4 is formed in a substantially triangular shape, so that the root dimension of the protrusion 14 is smaller than that of the first example embodiment. The projecting portion can be secured and further improved in strength.

  Next, FIG. 5 shows the thrust trace 4 of the thrust needle bearing 1 according to the embodiment of the fourth example of the present invention. In addition, the same code | symbol is attached | subjected about the part equivalent to embodiment of 1st example, and description is abbreviate | omitted or simplified.

  In the thrust trace 4 of the thrust needle bearing 1 according to the fourth example embodiment of the present invention, compared to the third example embodiment, not only the circumferential ends of the convex part 15 but also the radially outer side are bent and convex. A flange portion 17 is formed over the entire circumference of the portion 15.

  Thus, in the embodiment of the fourth example of the present invention, the protrusion 18 of the thrust trace 4 is formed as a continuous flange portion 17 over the entire circumference of the projection 15, thereby Compared with the embodiment, the protruding portion can be further improved in rigidity.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. For example, in the above-described embodiment, the cylindrical portion is provided on the inner peripheral edge of the race portion of the thrust race. However, the cylindrical portion may not be provided, and in the above-described embodiment, the thrust portion is not provided. Although the protrusion is provided on the outer peripheral edge of the race portion of the race, the protrusion may be provided on the inner peripheral edge.

DESCRIPTION OF SYMBOLS 1 Thrust needle bearing 2 Needle 3 Cage 4 Thrust trace 5 Race part 6 Cylindrical part 6a Free end 7 Opposing member 7a Opposing surface 7b Annular shaft part 7c Groove part 8 Projection part 9 Convex part 10 Flange part 10
DESCRIPTION OF SYMBOLS 11 Locking claw part 12 Flange part 13 Protrusion part 14 Protrusion part 15 Protrusion part 16 Flange part 17 Flange part 18 Protrusion part 100 Thrust needle bearing 101 Thrust trace 102 Anti-rotation piece 103 Stator 104 Oil groove 105 Cylindrical part 106 Cage 107 Detachment Pawl

Claims (4)

A plurality of needles arranged radially;
A cage having a pocket which is formed in a ring shape as a whole and holds the plurality of needles in a rollable manner;
At least one thrust race provided with a race portion with which the plurality of needles abut,
In a thrust needle bearing with
The radial end portion of the thrust trace is formed on the opposite side of the race portion in the radial direction, and is provided with a protruding portion that prevents rotation with respect to a mating member that supports the thrust trace.
A thrust needle bearing, characterized in that a fracture surface of a protruding portion of the thrust trace formed by press molding is not a contact surface with a mating member. 2. The thrust roller bearing according to claim 1, wherein the projecting portion is bent so that a fracture surface of the projecting portion of the thrust trace does not serve as a contact surface with the mating member. The thrust roller bearing according to claim 1, wherein the contact surface has a continuous shape. The thrust roller bearing according to claim 1, wherein the contact surface has a discontinuous shape.

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