JP2002303365A - Resin pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin pulley suitable for an idler bearing or a tensioner bearing capable of preventing water from stagnating in a recessed part between reinforcing ribs adjacently provided, and capable of preventing deformation or damage of the reinforcing ribs by swelling, and deterioration of bearing life of a rolling bearing by infiltration of the water. SOLUTION: This resin pulley is equipped with an inside diameter cylindrical part 16, an outside diameter cylindrical part 17, a disk part 19 provided between the inside and outside diameter cylindrical parts 16 and 17, and plural reinforcing ribs 20 radially provided on both surfaces of the disk part 19 between the inside and outside diameter cylindrical parts 16 and 17. Thickness of the reinforcing rib 20 at the disk part 19 side is thick at a corner part of a side surface of the reinforcing rib 20 along the rotational direction of the rolling bearing 11 and the disk part 19. The water stagnating in the recessed part S moves to an opposite direction from the rotational direction R, flows on a surface of a thick part 21 and is discharged to the outside of the recessed part S from a tip of the reinforcing rib 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulley made of resin suitable for an idler bearing, a tensioner bearing, and the like used for adjusting a belt tension and changing a traveling route in a timing belt of an automobile, an accessory driving belt, and the like. About.

[0002]

2. Description of the Related Art Conventionally, bearings used as accessory driving belts for transmitting the rotational power of an engine to the accessories of an automobile have been designed to reduce the weight and cost.
A bearing with a resin pulley is used, in which a synthetic resin pulley is integrally formed on the outer peripheral surface of a metal outer ring of a rolling bearing.

FIG. 10 shows a conventional bearing 40 with a resin pulley.
FIG.

[0004] The bearing 40 with a resin pulley is a rolling bearing 4.
A resin pulley 42 is integrally formed on the outer periphery of the pulley 1. The rolling bearing 41 includes an inner ring 43, an outer ring 44, rolling elements 45 of balls and rollers, and the like. Also, a resin pulley 42
Is an inner diameter cylindrical portion 4 fixed to the outer ring 44 of the rolling bearing 41.
6 and an outer cylindrical portion 47 having a belt guide surface 48 on the outer surface.
And a disk portion 49 provided between the inner diameter cylindrical portion 46 and the outer diameter cylindrical portion 47, and a plurality of reinforcing ribs 50 radially provided on both surfaces of the disk portion 49 to ensure strength. ing.

FIG. 11 is a sectional view of a resin pulley 42. As shown in FIG.

[0006]

By providing the reinforcing ribs 50 on the resin pulley 42, the reinforcing ribs 50 adjacent to each other are provided.
, A U-shaped concave portion S is generated. For this reason, when water enters the engine room of the automobile and the resin pulley 42 gets wet, the water stays in the concave portion S.

As shown in FIG. 12, when the rolling bearing 41 rotates, the water staying in the concave portion S moves in the direction B opposite to the rotation direction R, and enters the corners of the reinforcing rib 50 and the disk portion 49. 51
To stay in.

The reinforcing ribs 50 and the corners 51 of the disk portion 49
When water stays in the resin, when a resin having a water absorbing property such as polyamide 6-6 is used as a material of the resin pulley 42, the strength is reduced by swelling, and in extreme cases, the reinforcing rib 50 is deformed by the tension of the belt. Or it may be damaged.

Further, since water stays in the concave portion S, water easily enters the inside of the rolling bearing 41, and as a result,
Rust may be generated inside the rolling bearing 41, which may shorten the life of the bearing.

According to the present invention, it is possible to prevent water from staying in a concave portion between adjacent reinforcing ribs, and to prevent the reinforcing rib from being deformed or damaged due to swelling, and to prevent the life of the rolling bearing from being shortened due to water intrusion. It is an object of the present invention to provide a resin pulley that can be used.

[0011]

According to a first aspect of the present invention, there is provided a resin pulley comprising: an inner cylindrical portion fixed to an outer ring of a rolling bearing; an outer cylindrical portion having a belt guide surface on an outer surface; A disk portion provided between the cylindrical portions, and a plurality of reinforcing ribs radially provided between the inner and outer diameter cylindrical portions on both surfaces of the disk portion, and rotation of the rolling bearing of the reinforcing ribs In the corner between the side surface in the direction and the disk portion,
The thickness of the reinforcing rib on the side of the disk portion is increased.

According to the resin pulley of the first aspect of the present invention, the thickness of the reinforcing rib on the disk portion side at the corner between the side surface and the disk portion in the rotation direction of the rolling bearing of the reinforcing rib is reduced. By making it thicker, the corner can be eliminated. As a result, when the rolling bearing rotates, the water that has accumulated in the concave portion between the adjacent reinforcing ribs moves in the direction opposite to the rotation direction, and flows along the surface of the thick portion to drain from the distal end of the reinforcing rib to the outside of the concave portion. Is done. In this way, water can be prevented from staying in the concave portion, and the deformation and breakage of the reinforcing rib due to swelling, and the reduction of the bearing life of the rolling bearing due to intrusion of water can be prevented.

According to a second aspect of the present invention, there is provided a resin pulley, wherein the reinforcing ribs are inclined in a direction opposite to the rotation direction of the rolling bearing toward the outer diameter cylindrical portion.

According to the resin pulley of the second aspect of the present invention, since the reinforcing ribs are inclined in the direction opposite to the rotation direction of the rolling bearing, the water retained in the concave portion by the centrifugal force at the time of rotation of the rolling bearing. Can be smoothly drained out of the recess along the slope of the reinforcing rib.

According to a third aspect of the present invention, in the resin pulley, the surface of the thick portion of the reinforcing rib is convexly curved in the axial direction of the rolling bearing.

According to the resin pulley of the third aspect of the present invention, the surface of the thick portion of the reinforcing rib is convexly curved in the axial direction of the rolling bearing. Is small, and the water staying in the concave portion is easily discharged.

The resin pulley according to claim 4 of the present invention is characterized in that the surface of the thick portion of the reinforcing rib is concavely curved in the axial direction of the rolling bearing.

According to the resin pulley of the present invention, since the surface of the thick portion of the reinforcing rib is concavely curved in the axial direction of the rolling bearing, the thick portion of the reinforcing rib and the disc are formed. The portions are connected smoothly, and the water staying in the concave portion is smoothly drained to the outside of the concave portion along the surface of the thick portion.

According to a fifth aspect of the present invention, there is provided a resin pulley provided between an inner cylindrical portion fixed to an outer ring of a rolling bearing, an outer cylindrical portion having a belt guide surface on an outer surface, and the inner and outer cylindrical portions. A disk portion, having a plurality of reinforcing ribs radially provided between the inner and outer diameter cylindrical portions on both surfaces of the disk portion, each of the both side surfaces of the reinforcing rib and the disk portion In the corner portion, the thickness of the reinforcing rib on the side of the disk portion is increased.

According to the resin pulley of the fifth aspect of the present invention, at the corners between the both side surfaces of the reinforcing rib and the disk portion,
By increasing the thickness of the reinforcing ribs on the disk portion side, the corners can be eliminated. As a result, when the rolling bearing rotates, the water that has accumulated in the concave portion between the adjacent reinforcing ribs moves in a direction opposite to the rotating direction, and flows along the surface of the thick portion to drain from the distal end of the reinforcing rib to the outside of the concave portion. Is done. In this manner, water can be prevented from staying in the concave portion, and the deformation and breakage of the reinforcing rib due to swelling, and a reduction in the bearing life of the rolling bearing due to intrusion of water can be prevented. In addition, since the thick portions are provided on both side surfaces of the reinforcing rib, even if the rolling bearing is rotated in either of the left and right directions, water can be drained without collecting water at the corners of the reinforcing rib and the disk portion.

[0021]

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS.

FIG. 1 is a front view of a bearing 10 with a resin pulley formed by integrally molding a resin pulley 12 on the outer periphery of a rolling bearing 11. The rolling bearing 11 includes an inner ring 13, an outer ring 14, rolling elements 15 of balls and rollers, and the like.
The resin pulley 12 is provided on the outer ring 14 of the rolling bearing 11.
Inner diameter cylindrical portion 16 fixed to the inner surface, outer diameter cylindrical portion 17 having belt guide surface 18, inner diameter cylindrical portion 16 and outer diameter cylindrical portion 17
Between the disk part 19 provided between the disk part 1 and the disk part 1 for securing strength.
9 and a plurality of reinforcing ribs 20 provided radially on both surfaces of the reinforcing member 9.

FIG. 2 is an external view of the resin pulley 12.

Each reinforcing rib 20 is curved and inclined in the direction opposite to the rotation direction R of the rolling bearing 11 toward the outer cylindrical portion 17. Note that the reinforcing ribs 20 may be curved in the opposite direction.

At the corner between the disk portion 19 and the side surface of the reinforcing rib 20 in the rotation direction R of the rolling bearing 11, the disk is formed over the entire width direction of the reinforcing rib 20 (the axial direction of the rolling bearing 11). By increasing the thickness of the portion 19 side, the thick portion 2
1 is formed. The surface of the thick portion 21 is convexly curved in the axial direction of the rolling bearing 11.

When the rolling bearing 11 rotates, the water retained in the concave portion S between the adjacent reinforcing ribs 20 moves in the direction A opposite to the rotation direction R, and travels along the surface of the thick portion 21 so as to travel along the surface.
Is drained out of the recessed portion S from the tip end. In addition, since the reinforcing ribs 20 are inclined in the opposite direction to the rotation direction R of the rolling bearing 11, the water retained in the concave portions S is inclined by the centrifugal force generated when the rolling bearing 11 rotates. Is smoothly drained out of the concave portion S along the line.

Incidentally, as shown in FIG.
The thick portion 22 having a convex surface may be formed only in the vicinity of the disk portion 19, not in the entire width direction.

Further, as shown in FIG. 4, a thick portion 23 whose surface is concavely curved in the axial direction of the rolling bearing 11 or a thick portion 24 whose surface is smooth as shown in FIG. Good. Of course, these thick portions 23, 24 are not formed in the entire width direction of the reinforcing ribs 20, but as shown in FIG.
It may be formed only near the side. (Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

FIG. 6 is an external view of the resin pulley 12. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the reinforcing ribs 25 are provided on both sides of the reinforcing ribs 25 radially provided on both sides of the disk portion 19 and at the corners of the disk portion 19, respectively. Is thickened over the entire width direction of the reinforcing rib 25, and the surface of the thick portion 26 is convexly curved in the axial direction of the rolling bearing 11. Note that the reinforcing ribs 25 are provided linearly without inclining toward the outer diameter cylindrical portion 17 side.

As described above, since the thick portions 26 are provided on both side surfaces of the reinforcing ribs 25, even if the rolling bearing 11 is rotated in either the left or right direction, the water retained in the concave portions S is kept in the rotational direction R. It moves in the opposite direction A and is drained out of the recess S from the tip of the reinforcing rib 25 along the surface of the thick portion 26. That is, the bearing 10 with the resin pulley becomes non-directional, and the degree of freedom of the mounting position is improved.

The thick portion 26 is formed as shown in FIG.
In the case where the surface is concavely curved in the axial direction of the rolling bearing 11, FIG.
As shown in (1), the surface may be smooth. Further, the thick portion 26 may be formed not in the entire width direction of the reinforcing rib 25 but only in the vicinity of the disk portion 19 as shown in FIG. (Embodiment 3) Embodiment 3 of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

In this embodiment, each reinforcing rib 27 is
It is inclined linearly in a direction opposite to the rotation direction R of the rolling bearing 11 toward the outer diameter cylindrical portion 17 side, and the side surface of the reinforcing rib 27 in the rotation direction R of the rolling bearing and the disk portion 19 are inclined. At the corners, the thick portion 28 is formed by increasing the thickness of the disk portion 19 at the entire width direction of the reinforcing rib 20 or only near the disk portion 19 side. The surface of the thick portion 28 is convex, concave, or smooth in the axial direction of the rolling bearing 11. (Embodiment 4) FIG. 8 shows Embodiment 4 of the present invention.
This will be described with reference to FIG.

In this embodiment, the reinforcing ribs 29 are linearly provided without being inclined toward the outer diameter cylindrical portion 17 side. At the corner between the side surface and the disk portion 19 in the width direction of the reinforcing rib 29 or the disk portion 19
Only in the vicinity of the side, the thick part 30 is formed by increasing the thickness of the disk part 19 side. The surface of the thick portion 30 is convex, concave, or smooth in the axial direction of the rolling bearing 11.

In the first to fourth embodiments, in addition to the configuration of the thick portions 21, 22, 23, 24, 26, 29, and 30, the outer diameter cylindrical portion of the disc portion 19 is provided as shown in FIG. 1
The thick portions 35 may be formed on both side surfaces on the seventh side.

By forming the thick portion 35 in this manner, when the rolling bearing rotates, the thick portions 21, 22, 23,
The water remaining in the concave portion S is drained by the 24, 26, 29, and 30, and the water in the concave portion S can be drained to the outer diameter side by the centrifugal force of the rolling bearing also by the thick portion 35.

[0037]

According to the resin pulley of the present invention, water can be prevented from staying in the concave portion between adjacent reinforcing ribs, and the reinforcing ribs can be deformed or damaged by swelling, and the rolling bearing can be prevented from entering by water. The effect that the reduction of the bearing life can be prevented can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a bearing with a resin pulley according to Embodiment 1 of the present invention.

FIG. 2 is an external view of a resin pulley according to Embodiment 1 of the present invention.

FIG. 3 is an external view of a modified example of the resin pulley according to Embodiment 1 of the present invention.

FIG. 4 is an external view of a modified example of the resin pulley according to Embodiment 1 of the present invention.

FIG. 5 is an external view of a modified example of the resin pulley according to Embodiment 1 of the present invention.

FIG. 6 is an external view of a resin pulley according to Embodiment 2 of the present invention.

FIG. 7 is a front view of a bearing with a resin pulley according to Embodiment 3 of the present invention.

FIG. 8 is a front view of a bearing with a resin pulley according to Embodiment 4 of the present invention.

FIG. 9 is a cross-sectional view of a modified example of the bearing with a resin pulley of the present invention.

FIG. 10 is a front view of a conventional bearing with a resin pulley.

FIG. 11 is a sectional view of a conventional resin pulley.

FIG. 12 is an external view of a conventional resin pulley.

[Explanation of symbols]

 S recess 10 bearing with resin pulley 11 rolling bearing 12 resin pulley 16 inner diameter cylindrical part 17 outer diameter cylindrical part 19 disk part 20, 25, 27, 29 reinforcing rib 21, 22, 23, 24, 26, 29, 30 Thick part

Claims (5)

[Claims] An inner diameter cylindrical portion fixed to an outer ring of a rolling bearing; an outer diameter cylindrical portion having a belt guide surface on an outer surface; a disk portion provided between the inner and outer diameter cylindrical portions; A plurality of reinforcing ribs provided radially across the inner and outer diameter cylindrical portions on both surfaces, and at a corner between the side surface in the rotation direction of the rolling bearing of the reinforcing rib and the disk portion, A resin pulley, wherein the thickness of the reinforcing rib on the disk portion side is increased. 2. The resin pulley according to claim 1, wherein the reinforcing rib is inclined toward the outer diameter cylindrical portion in a direction opposite to a rotation direction of the rolling bearing. 3. The resin pulley according to claim 1, wherein the surface of the thick portion of the reinforcing rib is convexly curved in the axial direction of the rolling bearing. 4. The resin pulley according to claim 1, wherein the surface of the thick portion of the reinforcing rib is concavely curved in the axial direction of the rolling bearing. 5. An inner diameter cylindrical portion fixed to an outer ring of a rolling bearing, an outer diameter cylindrical portion having a belt guide surface on an outer surface, a disk portion provided between the inner and outer diameter cylindrical portions, A plurality of reinforcing ribs provided radially across the inner and outer diameter cylindrical portions on both surfaces, and at each corner of both sides of the reinforcing rib and the disk portion, the reinforcing ribs A resin pulley, wherein the thickness of the disk portion is increased.