JP2013145006A - Resin retainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin retainer capable of eliminating seizure of an inner ring and an outer ring by allowing sufficient lubricating oil to be supplied to a pocket.SOLUTION: In a resin retainer, in which a plurality of pockets 31 are formed at positions opening to the other end side and a pair of claws 32 are provided on an end surface at the other end side for each pocket 31, and which rotates in one direction, projections 36 projecting in an outer diameter direction are provided at only one end side in an axial direction within a range of the pockets 31 in a circumferential direction, first notches 34 being cut in the range of the pockets 31 in the axial direction continuously in the circumferential direction are formed at an outer circumference other than the projections 36, second notches 35 being cut while penetrating through in the axial direction are formed between the pockets 31 in the circumferential direction, side surfaces 38, 39 at both sides in the circumferential direction of the projections are inclined so that the other end side becomes a rotational direction rear part as compared with the one end side, and a slope 37 sloped to the other end side toward the front in the rotational direction of the next projection 36 that is present in the rotational direction rear part from the rotational direction front part of the projection 36 is formed at an end surface at the one end side.

Description

  The present invention relates to a resin cage used for a rolling bearing.

  A resin cage 100 shown in FIG. 4 (Patent Document 1) has a plurality of pockets 110 in the circumferential direction and a pair of claws 111 in each pocket 110. A plurality of axial grooves 120 are formed in the circumferential direction on the outer periphery of the resin cage 100 in the axial direction. By supplying the lubricating oil to the pocket 110 via the axial groove 120, the lubricating oil is supplied between the not-shown ball and outer ring and between the ball and inner ring.

JP 2000-46058 A

  The lubricating oil on the one end side of the resin cage 100 flows to the other end side of the resin cage 100 via the axial groove 120, and circulates in the circumferential direction before being supplied to the pocket 110. Since it is long, the amount of lubricating oil supplied to the pocket 110 becomes insufficient, and seizure of the outer ring and the inner ring is likely to occur. The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a resin cage capable of eliminating seizure of the outer ring and the inner ring by supplying sufficient lubricating oil to the pocket. I will provide a.

  The invention according to claim 1 has a ring shape, and a plurality of pockets are formed in a circumferential direction at a position not opening on one end side but opening on the other end side, and the pocket is formed on an end surface on the other end side. In a resin cage that provides a pair of claws at a position corresponding to, and rotates in one direction, within the range from the end surface on the one end side to the pocket in the axial direction, within the range of the pocket in the circumferential direction, Protruding portions projecting in the outer diameter direction are provided, and first notches continuously formed in the circumferential direction within the range of the pockets in the axial direction are formed on the outer periphery other than the projecting portions in the circumferential direction. A second notch is formed by penetrating in an axial direction between the pockets, and the side surfaces on both sides in the circumferential direction of the protrusion are inclined so that the other end side is rearward in the rotational direction compared to the one end side. , The rotation front of the protrusion is aligned with the end surface on the one end side. Forming a sloped surface that protrudes to the side and slopes toward the other end toward the front of the rotation of the next projection at the rear in the rotational direction, and a side surface of the projection at one end from the second notch, and The inclined surface is extended to the inner diameter rather than the second notch.

  According to the present invention, the lubricating oil on one end side is supplied to the pocket through the second notch and the first notch, and the path is short, so that the amount of lubricating oil supplied to the pocket is sufficient. In addition, seizure of the outer ring and the inner ring hardly occurs. Further, since the cross-sectional area is increased by reducing the cross-sectional area in the circumferential direction to increase the cross-sectional area, there is little possibility of breakage due to a tensile load in the circumferential direction. Furthermore, since the inclined surface inclined to the other end side from the front in the rotation direction of the projection portion toward the front in the rotation direction of the next projection portion behind the rotation is formed on the end surface on the one end side, the lubrication on the one end side is formed. Can draw oil. Further, since the side surfaces on both sides in the circumferential direction of the protrusion are inclined toward the other end side so as to be rearward of the rotation, the force to send the lubricating oil to the pocket side by rotation works, and the lubrication supplied to the pocket The amount of oil will be more sufficient.

It is a front view of the ball bearing in the embodiment of the present invention. It is the sectional view on the AA line of FIG. 1 in embodiment of this invention. It is a perspective view of the resin cage in the embodiment of the present invention. It is a perspective view of the conventional resin cage.

  An embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a front view of a ball bearing, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a perspective view of a resin cage.

  The rolling bearing shown in FIGS. 1 and 2 is a ball bearing 10 using balls as rolling elements. The ball bearing 10 includes a ring-shaped outer ring 11, a ring-shaped inner ring 20 disposed on the inner peripheral side of the outer ring 11, a ring-shaped resin cage 30 disposed between the outer ring 11 and the inner ring 20, and a resin. It consists of a plurality of balls 40 held by the holder 30.

  An outer ring side raceway surface 12 having an arc cross section is formed on the inner periphery of the outer ring 11, and outer ring side shoulders 13 are formed on both sides of the outer ring side raceway surface 12 in parallel with the axis.

  An inner ring side raceway surface 22 having an arc cross section is formed on the outer periphery of the inner ring 20, and inner ring side shoulders 23 are formed on both sides of the inner ring side raceway surface 22 in parallel with the axis.

  The resin cage 30 is used to rotate in one direction, that is, the R direction in FIG. The resin cage 30 has a plurality of pockets 31 in the circumferential direction, and a ball 40 is rotatably held in each pocket 31 as shown in FIGS. 1 and 3. The ball 40 is made of metal and has a spherical shape.

  As shown in FIGS. 2 and 3, the pocket 31 is formed at a position that does not open on one end side of the resin cage 30 in the axial direction but opens on the other end side. A pair of claws 32 protrude in the axial direction from the end face on the other end side of the resin cage 30, and the pair of claws 32 are provided for each pocket 31. When the ball 40 is inserted between the pair of claws 32, the space between the pair of claws 32 is expanded. A protrusion 36 is formed on the outer periphery of the resin cage 30 so as to protrude in the outer diameter direction within the range from the end surface on one end side to the pocket 31 in the axial direction and within the range of the pocket 31 in the circumferential direction. Yes. On the outer periphery of the resin cage 30, a first notch 34 is formed at a position other than the protruding portion 36 and continuously cut in the circumferential direction within the pocket 31 in the axial direction. Further, on the outer periphery of the resin cage 30, a second notch 35 is formed at a position other than the protrusion 36 and is notched through in the axial direction between the pockets 31 in the circumferential direction.

  The side surfaces 38 and 39 on both sides in the circumferential direction of the projecting portion 36 are inclined so that the other end side is the rotational rear side compared to the one end side. An inclined surface 37 is formed on the end surface on one end side, which is inclined toward the other end side from the rotation front of the projection 36 to the rotation front of the next projection 36 located behind the rotation. The inclined surface 37 is formed for each protrusion 36, and there are the same number of inclined surfaces 37 as the protrusions 36. The side surfaces 38 and 39 and the inclined surface 37 on one end side from the second notch 35 are extended to the inner diameter side from the second notch 35. More specifically, the side surfaces 38 and 39 are formed from the outer periphery of the protrusion 36 to the second notch in the radial direction within the range of the second notch 35 in the axial direction. A side surface 38 is formed from the outer periphery of the protrusion 36 to the inner periphery of the resin cage 30 in the radial direction on one end side of the second notch 35 in the axial direction. Within the range of the pocket 31 in the circumferential direction, the inclined surface 37 is formed from the outer periphery of the protrusion 36 to the inner periphery of the resin cage 30. In the circumferential direction, between the pockets 31, the inclined surface 37 is formed from the second notch 35 to the inner periphery of the resin cage 30.

  In the circumferential direction, the resin cage 30 has the smallest cross-sectional area including the axis in the range of the pocket 31, and this portion is easily broken by a tensile load in the circumferential direction. Since the area of the cross section including the axis is increased by the protrusion 36, it is difficult to break. The resin retainer 30 includes an injection mold using an injection molding machine, and includes a pocket 31, a protrusion 36, a first notch 34, a second notch 35, side surfaces 38 and 39, and an inclined surface 37. Molded integrally.

  Subsequently, the assembly operation of the ball bearing 10 will be described.

  In FIG. 1, the outer ring 11 and the inner ring 20 are arranged coaxially, and the outer ring 11 is inclined with respect to the inner ring 20. The ball 40 is inserted into the gap between the outer ring 11 and the inner ring 20, and the inserted ball 40 is shifted in the circumferential direction of the outer ring 11. When the insertion of all the balls 40 is completed, the inclination of the outer ring 11 is released, the outer ring 11 is arranged coaxially with the inner ring 20, and the balls 40 are arranged at equal intervals in the circumferential direction. A resin cage 30 is inserted between the outer ring 11 and the inner ring 20 from one end side in the axial direction, and the ball 40 expands the gap between the pair of claws 32. When further inserted, the pair of claws 32 elastically return in a direction in which the gap between the pair of claws 32 is narrowed following the ball 40. Thus, the ball 40 is held by the pair of claws 32 so as not to come off.

  Since the resin cage 30 is fitted into the ball 40 after the ball 40 is inserted between the outer ring 11 and the inner ring 20, the operation of inserting the ball 40 between the outer ring 11 and the inner ring 20 is facilitated. The ball bearing 10 is used by inserting a rotation shaft (not shown) into the inner ring 20 and inserting the outer ring 11 into a housing (not shown).

  The use situation of the ball bearing 10 will be described.

  When the inner ring 20 is rotated together with the rotation shaft, the balls 40 roll on the outer ring side raceway surface 12 and the inner ring side raceway surface 22, and the balls 40 move in the same direction as the rotation direction of the inner ring 20. The resin cage 30 that holds the balls 40 also moves in the same direction as the balls 40.

  A radial load such as gravity is applied to the ball bearing 10. Along with the rotation of the inner ring 20, the ball 40 advances and delays in the process of rolling the ball 40 to a place where a radial load is applied. When passing through a place where a radial load is applied, the advancement of the ball 40 is accelerated. As a result, a tensile load in the circumferential direction acts on the resin cage 30, and the area of the pocket 31 is easily broken in the circumferential direction where the area of the cross section including the axis is small. Providing the protrusions 36 integrally in the pocket 31 area increases the cross-sectional area including the axis and makes it difficult to break.

  Lubricating oil is supplied between the outer ring 11 and the inner ring 20 from the outside. Lubricating oil on one end side in the axial direction is drawn into the inclined surface 37 side when the inclined surface 37 rotates in the direction of arrow R in FIG. 3 and is removed by the side surface 38 on one end side from the second notch 35. It moves to the radial side, and further moves to the pocket 31 by the side surface 38 that is within the range of the first notch 35 in the axial direction. As indicated by an arrow F in FIG. 3, the ink is supplied to the pocket 31 through the second notch 35 and the first notch 34. Since the path to the pocket 31 is short, sufficient lubricating oil can be supplied to the pocket 31. The lubricating oil supplied to the pocket 31 adheres to the balls 40 and is supplied between the balls 40 and the outer ring 11 and between the balls 40 and the inner ring 20. Since sufficient lubricating oil is supplied, the outer ring side raceway surface 12 of the outer ring 11 and the inner ring side raceway surface 22 of the inner ring 20 are difficult to seize. Since the lubricating oil is drawn in by the inclined surface 37 and pushed out to the pocket 31 by the side surface 38, a sufficient amount of lubricating oil can be supplied to the pocket 31.

  The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.

  In the embodiment described above, the protrusion 36 is formed in a range slightly narrower than the range of the pocket 31 in the circumferential direction. In this way, the path for supplying the lubricating oil can be shortened without being obstructed by the protrusion 36. As another embodiment, the protrusion 36 may be formed over the entire range of the pocket 31 in the circumferential direction. The strength of the resin cage is increased.

11: outer ring, 20: inner ring, 30: resin cage, 31: pocket, 32: pair of claws, 34: first notch, 35: second notch, 36: protrusion, 37: inclined surface , 38: side, 39: side, 40: ball (rolling element)

Claims (1)

It has a ring shape, a plurality of pockets are formed in the circumferential direction at a position that does not open on one end side and opens on the other end side, and a pair of claws are formed on the end surface on the other end side at a position corresponding to the pocket. In a resin cage that is provided and rotates in one direction,
Protruding portions projecting in the outer diameter direction are provided in the range from the end face on the one end side to the pocket in the axial direction, and in the range of the pocket in the circumferential direction, and on the outer periphery other than the protruding portion in the axial direction Forming a first notch continuously cut in the circumferential direction within the range of the pocket, and forming a second notch penetrating in the axial direction between the pockets in the circumferential direction; The side surfaces on both sides in the circumferential direction of the protruding portion are inclined so that the other end side is rearward in the rotation direction compared to the one end side, and the rotation front of the protruding portion protrudes toward one end side on the end surface on the one end side, and the rotation direction An inclined surface that is inclined toward the other end side toward the rotation front of the next protrusion portion at the rear is formed, and the side surface of the protrusion portion and the inclined surface that are closer to the one end side than the second notch are Characterized by extending to the inner diameter rather than the two notches Resin cage.

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