JPH0942324A - Rotational part having one-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotational part having a one-way clutch which is composed of a small number of items, easy to assemble while causing a small manufacturing cost. SOLUTION: A shaft insertion hole 2 is formed on an axis of a rotary wheel 1 formed of synthetic resin mold. A plurality of housing spaces 3 are formed on an inner periphery of the shaft insertion hole 2, while a roller 5 is assembled in each of the housing spaces 3. A spring housing space 6 which has relatively inclined inner and outer wall surfaces 7, 8 is formed on an outer diameter side of the housing space 3. An elastic piece 10 composed of a metal thin plate is assembled in each spring housing space 6. The roller 5 is pressurized inward by the elastic piece 10. The roller 5 is fitted between an outer peripheral surface of a shaft 9 inserted into the shaft insertion hole 2 and the inner surface of the elastic piece 10 for transmitting rotation of only one direction of the shaft 9 to the wheel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary component with a one-way clutch, and more specifically, a rotary component with a one-way clutch in which a rotary wheel such as a gear or roller made of a synthetic resin molding has a one-way clutch function. It is about parts.

[0002]

2. Description of the Related Art When a rotary wheel such as a gear is provided on a rotary shaft and rotation of one direction is transmitted between the two parts and rotation transmission of the other direction is interrupted, a rotation wheel is provided between the rotary shaft and the rotary wheel. A one-way clutch is installed in.

Here, if the one-way clutch and the rotary wheel are separate parts, it takes a lot of time to assemble them. Therefore, a rotary part with a one-way clutch having a one-way clutch built in the rotary wheel has been proposed.

[0004]

In the conventional rotary component with a one-way clutch, a one-way clutch consisting of a clutch outer ring, a cage, rollers and a spring is used as a fitting recess of a rotary wheel made of a synthetic resin molded product. Because it has a large number of parts that are fitted to
There is a problem that assembly is time-consuming and costly.

An object of the present invention is to provide a rotary component with a one-way clutch which has a small number of components, is easy to assemble, and is inexpensive.

[0006]

In order to solve the above problems, in the first invention, a shaft insertion hole is formed on the shaft center of a rotary wheel made of a synthetic resin molded product, and the shaft insertion hole is formed. A plurality of roller storage spaces that open at one end of the rotating wheel are provided on the inner circumference of the roller at predetermined intervals in the circumferential direction, and rollers are installed in each roller storage space. Are inclined relative to each other, and each wall is provided with a spring accommodation space that forms a wedge angle with the tangent line passing through the contact at the shaft where it is inserted into the shaft insertion hole. A plate-shaped elastic piece made of metal is incorporated, and a retaining lid for the elastic piece is attached to one end surface of the rotating wheel.

Further, in the second invention, the spring accommodating space in the first invention is made to communicate with each other at its end portions, and a polygonal surface is formed on the polygonal surface formed by the inner wall surface of the spring accommodating space. A metal spring ring is fitted, and the spring ring is provided with elastic pieces for pressing rollers in the same number as the rollers.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention. As shown, the rotary wheel 1 is made of a synthetic resin molded product. As the rotary wheel 1, a roller, a sprocket, and the like can be used in addition to the illustrated gear.

A shaft insertion hole 2 is formed on the axis of the rotary wheel 1, and a plurality of roller accommodating spaces 3 are formed at equal intervals on the inner circumference of the shaft insertion hole 2.

The roller storage space 3 is open at the bottom surface of the lid fitting recess 4 formed on one end surface of the rotary wheel 1, and the rollers 5 are incorporated in each roller storage space 3.

The circumferential length L of the opening on the inner diameter side of the roller housing space 3 is smaller than the outer diameter of the roller 5, and the roller 5 has the shaft insertion hole 2
It is prevented from getting inside.

A spring storage space 6 is provided on the outer diameter side of each roller storage space 3. The spring housing space 6 has flat wall surfaces 7 and 8 inside and outside, and the wall surfaces 7 and 8 are relatively inclined. In addition, the wall surface 7 has a shaft 9 inserted into the shaft insertion hole 2.
A ridgeline passing through the contact point with point 5 forms a wedge angle α. On the other hand, the wall surface 8 also forms a wedge angle with the tangent line which is slightly larger than the wedge angle α.

An elastic piece 10 made of a thin metal plate is incorporated in each spring accommodation space 6, and the roller 5 is pressed inward by the elastic piece 10.

The elastic piece 10 and the roller 5 are prevented from slipping outward by the lid 11 fitted in the lid fitting recess 4. On the other hand, the lid 11 is prevented from coming off by the engagement of the protrusion 12 formed on the outer periphery thereof and the engagement groove 13 provided on the inner periphery of the lid fitting recess 4.

Now, the shaft 9 inserted into the shaft insertion hole 2 is shown in FIG.
When the roller 5 is rotated in the direction of the arrow, the roller 5 moves to the narrower side of the wedge space formed by the elastic piece 10 and the outer peripheral surface of the shaft 9 due to the contact with the shaft 9, and the elastic piece 10 is pushed by the roller 5 to have an outer diameter. Transforms in the direction.

When the elastic piece 10 is deformed until it comes into close contact with the outer wall surface 8 of the spring accommodating space 6, the roller 5 is caught in the inner surface of the elastic piece 10 and the outer peripheral surface of the shaft 9, and the rotation of the shaft 9 causes the rotation wheel 1 to rotate. Transmitted.

When the shaft 9 rotates in the direction opposite to the arrow shown in FIG. 1, the roller 5 moves to a wider part of the wedge space formed by the elastic piece 10 and the outer peripheral surface of the shaft 9, and the shaft 9 rotates. Is not transmitted to the rotating wheel 1.

When the roller 5 is pressed by the plate-like elastic piece 10 as in the embodiment shown in FIG. 1, the roller 5 and the elastic piece 10 make a line contact, and the elastic piece 10 makes the roller 5 average over the entire length. Therefore, the roller 5 can be prevented from skewing.

3 to 5 show a second embodiment of the present invention. In the second embodiment, the spring accommodating spaces 6 provided on the outer diameter side of the roller accommodating spaces 3 are communicated with each other at their end portions, and on the polygonal surface formed by the inner wall surface 7 of each spring accommodating space 6. A polygonal spring ring 14 is fitted in the.

The spring ring 14 is formed by bending a strip-shaped thin metal plate and has an axial cut 15 along each bending line.
By forming a cut 16 parallel to the end face of the spring ring 14 from the end of the cut 15, elastic pieces 17 of the same number as the rollers 5 are provided, and each elastic piece 17 presses the roller 5 inward.

Here, the width of the elastic piece 17 is equal to or longer than the axial length of the roller 5, and the ring-shaped portion 18 provided on one side of the elastic piece 17 is located in the spring accommodating space 6. It is inserted into a fitting groove 19 provided on the closed end side.

Since the other construction is the same as that of the above-mentioned embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

In the embodiment shown in FIGS. 3 to 5, since the plurality of elastic pieces 17 are provided in the spring ring 14, the elastic pieces are compared with the case where the elastic pieces 10 are assembled in the spring housing space 6 one by one. 17 can be easily incorporated.

[0025]

As described above, according to the present invention, the rotary wheel, the rollers, the elastic pieces, and the lid have a small number of parts, so that the assembly is easy and the cost of the rotary part with a one-way clutch is low. Can be reduced.

Further, since the elastic piece comes into contact with the entire length of the roller and presses the roller inward, skew of the roller can be prevented and clutch accuracy can be improved.

Further, the ends of the plurality of spring accommodating spaces are communicated with each other, and a spring ring of the same shape is fitted on the polygonal surface formed by the inner wall surface of the spring accommodating space, and the spring rings are fitted to the spring rings. By providing the elastic piece, the assembling of the elastic piece can be facilitated.

Further, by making the length in the circumferential direction of the inner diameter side opening of the spring accommodating space smaller than the outer diameter of the roller,
It prevents the rollers from falling inward and makes it easy to transport the rotating parts before assembling.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a partially cutaway front view showing a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an exploded perspective view showing a part of a rotating wheel and a spring ring of the same.

[Explanation of symbols]

 1 rotary wheel 2 shaft insertion hole 3 roller storage space 5 roller 7 inner wall surface 8 outer wall surface 9 shaft 10 elastic piece 11 lid 14 spring ring 17 elastic piece

Claims (3)

[Claims] 1. A shaft receiving hole is formed on a shaft center of a rotary wheel made of a synthetic resin molded product, and a plurality of roller storage spaces opened at one end of the rotary wheel at an inner circumference of the shaft inserting hole are circumferentially formed. The rollers are installed in each roller storage space at the required intervals, the inner and outer wall surfaces are inclined relative to the outer diameter side of each roller storage space, and each wall surface is inserted into the shaft insertion hole. A spring accommodating space that forms a wedge angle with the tangent line that passes through the contact points is provided, and a plate-shaped metal elastic piece that presses the roller inward is installed in each spring accommodating space, and the slip-off prevention cover of the elastic piece A rotating part with a one-way clutch with the body attached to one end of the rotating wheel. 2. The ends of the spring accommodating space are communicated with each other, and a polygonal metal spring ring is fitted on a polygonal surface formed by the inner wall surface of the spring accommodating space. 2. The rotary component with a one-way clutch according to claim 1, wherein the ring is provided with elastic pieces for pressing rollers in the same number as the rollers. 3. The width dimension in the circumferential direction of the opening on the inner diameter side of the roller housing space is smaller than the outer diameter of the roller.
Alternatively, the rotating component with a one-way clutch according to item 2.