JP2013148119A - Resin retainer - Google Patents

Abstract

A resin cage capable of supplying a sufficient amount of lubricating oil to a pocket and eliminating seizure of an outer ring and an inner ring.
A plurality of pockets 31 are formed in a circumferential direction at a position that is ring-shaped, does not open on one end side, and opens on the other end side, and corresponds to the pocket 31 on the end face on the other end side. In the resin cage 30 provided with a pair of claws 32, the first protruding in the outer diameter direction within the range from the end face on one end side to the pocket 31 in the axial direction and within the range of the pocket 31 in the circumferential direction. And a second protrusion protruding in the outer diameter direction between the pockets 31 in the circumferential direction only on the other end side in the axial direction, and the first protrusion 36 and the second protrusion. A first notch 37 continuously formed in the circumferential direction within the range of the pocket 31 excluding the second protrusion in the axial direction is formed on the outer periphery other than the portion 38, and between the pockets 31 in the circumferential direction. Second notch 35 cut through the axial direction The formed.
[Selection] Figure 3

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 provided with a pair of claws at a position corresponding to the above, in the range from the end surface on the one end side to the pocket in the axial direction, in the circumferential direction, within the range of the pocket, protrude in the outer diameter direction Provided in the axial direction only at the other end side, and provided between the pockets in the circumferential direction between the pockets. Formed on the outer periphery other than the second protrusion is a first notch continuously cut in the circumferential direction within the pocket except for the second protrusion in the axial direction, Between pockets, from the end face on the one end side in the axial direction Serial, characterized in that the formation of the-out second notch had notched toward the first notch of the.

  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. Since the lubricating oil guided to the first notch is forcibly guided to the pocket by the second protrusion provided on the other end side, the amount of lubricating oil supplied to the pocket is further increased. Further, seizure of the outer ring and the inner ring is less likely to occur. In addition, since the first projecting portion is provided where the cross-sectional area is reduced in the circumferential direction to increase the cross-sectional area, the possibility of breakage due to a tensile load in the circumferential direction is low.

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 has a plurality of pockets 31 in the circumferential direction, and balls 40 are rotatably held in the pockets 31. 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.

  On the outer periphery of the resin cage 30, there is a first protrusion 36 protruding in the outer diameter direction within the range from the end face on one end side to the pocket 31 in the axial direction and within the pocket 31 in the circumferential direction. Is formed. On the outer periphery of the resin cage 30, there is formed a second protrusion 38 protruding in the outer diameter direction only between the other end side in the axial direction and between the pockets 31 in the circumferential direction. The second protrusions 38 are formed continuously in the circumferential direction between the pockets 31 and have pockets 31 and claws 32 on both sides in the circumferential direction.

  The outer circumference of the resin cage 30 is continuous in the circumferential direction at a position other than the first projection 36 and the second projection 38 in the range of the pocket 31 excluding the second projection 38 in the axial direction. A first cutout 37 that is cut out is formed. In other words, the first cutout 37 is a cutout continuously in the circumferential direction between the first protrusion 36 and the second protrusion 38 in the axial direction. Further, the outer circumference of the resin cage 30 is provided with a first cut from the end face on one end side in the axial direction between the pockets 31 in the circumferential direction at a position other than the first projection 36 and the second projection 38. A second notch 35 that is notched over the notch 37 is formed.

  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 first protrusion 36, it is difficult to break. The resin cage 30 is formed by an injection molding machine using an injection mold, and a pocket 31, a first protrusion 36, a second protrusion 38, a first notch 37, and a second notch 35. Are integrally formed.

  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. By providing the first protrusion 36 integrally in the range of the pocket 31, the area of the cross section including the axis is increased and it is 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 supplied to the pocket 31 through the second notch 35 and the first notch 37 as shown by an arrow F in FIG. Since the path to the pocket 31 is short, sufficient lubricating oil can be supplied to the pocket 31. Since the lubricating oil guided to the first notch 37 is forcibly guided to the pocket 31 by the second protrusion 38, the amount of lubricating oil supplied to the pocket 31 is further increased. 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.

  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, 35: second notch, 36: first protrusion, 37: first notch, 38 : Second protrusion, 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 provided on the end surface on the other end side at a position corresponding to the pocket In the provided resin cage,
Provided in the range from the end face on the one end side in the axial direction to the pocket is a first protrusion protruding in the outer diameter direction within the range of the pocket in the circumferential direction, and only the other end side in the axial direction. In the circumferential direction, a second protrusion protruding in the outer diameter direction is provided between the pockets, and the second protrusion in the axial direction is provided on the outer periphery other than the first protrusion and the second protrusion. A first notch continuously cut in the circumferential direction is formed within the range of the pocket excluding the protrusion, and the first notch is formed between the pockets in the circumferential direction and from the end surface on the one end side in the axial direction. A resin cage, characterized in that a second notch is formed in the notch.

Images