JP2577605Y2 - One-way clutch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch using rollers.

[0002]

2. Description of the Related Art A conventional one-way clutch is disclosed, for example, in Japanese Utility Model Laid-Open No. 54-69259.
This one-way clutch uses an S-shaped spring,
The following is used as a retainer to which this spring is mounted. In this example, the S-shaped spring is brought into contact with the roller by a line or a surface to exhibit excellent wear resistance and fatigue resistance.

[0003] The retainer has a shape in which a plurality of protruding pieces are provided in a comb-teeth shape at several circumferential positions on one side surface of an annular main body. A concave portion that is concave in one circumferential direction is provided to the full length. A spring is housed in this recess, and a roller is housed between two projecting pieces adjacent in the circumferential direction. The spring is housed unrestricted with respect to the retainer, but the spring and the roller are simultaneously accommodated in the roller pocket of the retainer to utilize the restoring force of the spring caused by the compression of the spring. The spring and roller are stretched in the pocket to prevent falling off.

[0004]

In the one-way clutch, a spring having excellent wear resistance and fatigue resistance is used. It is pointed out that the assemblability is poor, for example, it must be prevented from falling off.

In addition, since the projecting piece of the retainer in which the spring accommodating portion is formed is in a cantilever state, the projecting piece is inclined with respect to the axis to cause skew of the roller. Is also likely to be unstable.

The present invention has been made in view of the above circumstances, and aims to provide a structure that is easy to assemble and has a stable one-way clutch function while using a spring having a shape excellent in wear resistance and fatigue resistance. Aim.

[0007]

In order to achieve the above object, the present invention has the following configuration.

The one-way clutch of the present invention has a cylindrical body having a plurality of cam surfaces formed at predetermined intervals on an inner peripheral portion thereof, the cam surface exhibiting a one-way clutch function, and is held on the inner periphery of the cylindrical body.
And a hole penetrating in and out in the radial direction corresponding to the same number of the cam surfaces.
Outside in the radial direction adjacent to roller pockets and roller pockets
A cylindrical retainer recesses provided to open in the direction, and a plurality of rollers which are respectively freely circumferentially rolling the roller pocket of the retainer housing, is held in the concave portion of the retainer said roller substantially resiliently urging to <br/> Ru planar view to lock side of the front asked arm surface and a spring Z-shaped, and said retainer
Partitioning the roller pocket and recess in the circumferential direction
Two axially opposed roller pockets and recesses
State protruding toward the center in the axial direction from the wall and facing non-contact
And two projections provided on the retainer.
The one arm portion of the spring has an opposing gap between the two projecting pieces.
The intermediate portion of the spring is further in front of the roller pocket.
The spring is positioned so that the other arm of the spring is positioned
Fits into recesses and roller pockets from outside diameter
The other arm of the spring is
It is characterized in that it is contacted by a line or a surface with a roller in the roller .

[0009]

According to the present invention, the concave portion of the retainer and the roller pocket are provided.
To separate the spring and roller
doing. Therefore, the spring and the roller are
Can be assembled separately, making assembly work easy
Become so.

Further , one arm of the spring is provided on the holder.
Into the recess that opens outward in the radial direction.
To partition the arm between the recess and the roller pocket
Into the roller pocket side with the two projections in between,
This other arm is connected to a line or a line along the longitudinal direction of the roller.
The contact is made on the surface. Therefore, the posture of the spring
Is stable and the circumference of the roller is
Roller can be applied
It becomes difficult to queue.

Further, a spring having a substantially Z-shape in plan view is
Fits from the outside diameter side into the concave part and roller pocket of
I try to make it. Therefore, during the spring mounting process
And the spring is less likely to be deformed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 5 show an embodiment of the present invention. The one-way clutch shown in the figure includes a shell-shaped outer ring 1 as a cylindrical body, a retainer 2, a plurality of rollers 3, and the same number of springs 4 as the rollers 3.

The shell-shaped outer race 1 has its cylindrical main body portion whose both axial ends are bent inward in the radial direction, and a cam surface 5 which exhibits a one-way clutch function is provided on the inner peripheral surface of the cylindrical main body portion. The rollers 3 are provided at the same number of predetermined intervals.

The retainer 2 is made of, for example, a synthetic resin. The retainer 2 is provided with the same number of roller pockets 6 penetrating radially inward and outward in a cylindrical main body at intervals corresponding to the cam surfaces 5. , Adjacent to each roller pocket 6
A concave portion 7 that opens radially outward is provided. Also concave
The part 7 and the roller pocket 6 are composed of two projecting pieces 1 described below.
6 and 17 divide in the circumferential direction. Two prongs
16 and 17 are roller pockets 6 and 17 as shown in FIG.
Axial center on two inner walls facing each other in the axial direction
Is provided so as to protrude toward
You. The two projecting pieces 16 and 17 are formed in a substantially triangular shape in plan view.
The tops 16a and 17a are shifted in the circumferential direction.
The surfaces facing each other are formed by springs 4 to be described later.
The slopes 12 and 13 have the same direction as the intermediate portion 10.
Furthermore, the opposite sides of the slopes 12 and 13 of the both protruding pieces 16 and 17
The surfaces 14 and 15 are flat surfaces parallel to the axis of the cage 2. In addition , the bottom of the concave portion 7
Formed over an annular part, so to speak
Is in a state of sufficient rigidity.
Therefore, the posture of the spring 4 held in the concave portion 7 is hardly inclined.

The spring 4 is formed by bending a band-shaped plate material such as phosphor bronze into a substantially Z-shape in plan view .
The roller 3 in the roller pocket 6 is pressed toward the lock side of the cam surface 5. Specifically, the spring 4, the retainer 2
One arm 8 which is capable pressed mounted removably in the recess 7
If, the other arm portion 9 in contact with the line or surface along the longitudinal direction of the roller 3 in the roller pocket 6, the arms
The relative position of the 8,9 that Do from an intermediate portion 10 which connects the two so that the variable freely. Each end of both arms 8, 9
The edges are bent in directions facing each other. One arm portion 8 of the spring 4, the side wall so as to be positioned in a space 18 formed between the bent piece 8a of the end edge to the circumferential side wall 7a of the plane 15 and a concave portion 7 of the protrusion 17 7a, and the intermediate portion 10 of the spring 4 is
It has been fitted to the opposite gap 19 between 6 and 17, thereby, the other arm portions 9 of the spring 4 has entered into roller pocket 6. Then, one arm portion 8 of the spring 4, concave
Abuts against the circumferential side wall 7a of the portion 7 and
Bent piece 8a is brought into contact with the flat surface 15 of the protrusion 17. Also, the U-shaped portion between the intermediate portion 10 of the spring 4 and the one arm portion 8 is brought into contact with the inclined surface 12 of the protruding piece 16 (a surface inclined in the same direction as the connecting portion 10) so that the roller 3
And the bent piece 11 on the edge of the other arm 9 is received by the flat surface 14 of the protruding piece 16 on the roller pocket 6 side when the spring 4 is compressed. 4 is set not to compress more than necessary, which means that the middle part 10 of the spring 4 and the other
The U-shaped part between the rubber parts 9 is received by the slope 13 of the protruding piece 17, so that it becomes more reliable. Moreover, the spring 4 is set so that the pressing force at each position in the axial direction of the roller 3 is uniform when the spring 4 is in contact with the roller 3 along a line or a surface along the longitudinal direction.

The one-way clutch shown in the drawing has an annular backing plate 20 in addition to the above-described structure.
One of the flanges at both ends in the axial direction of the shell-shaped outer ring 1 is formed radially inward and long, and spline teeth are formed on the inner periphery of the flange. The structure is such that it can be easily attached to the driven shaft 22).

Next, the operation will be described. For example, each roller 3
When the drive shaft 21 inserted in the inner diameter side of the roller is rotated in the direction of arrow A in FIG.
The roller 3 is rolled toward the narrow gap side between the shaft 3 and the drive shaft 21, and the rollers 3 are sandwiched and locked there. Thereby, the shell-shaped outer ring 1 is separated from the drive shaft 21 via each roller 3.
Since the rotational driving force is transmitted to the driven shaft 22 which is integrally connected with the driven shaft 22, the driven shaft 22 is rotated in the same direction as the driving shaft 21.

On the other hand, when the drive shaft 21 is rotated in the opposite direction, that is, in the direction of the arrow B in FIG. 2, each roller 3 rolls toward the wide gap between the cam surface 5 of the shell-shaped outer ring 1 and the drive shaft 21. And each roller 3 comes to idle there. As a result, the rotational driving force is not transmitted from the rotating shaft 21 to the driven shaft 22, so that the driven shaft 22 does not rotate.

Incidentally, the Z-shaped spring 4 as described above is used.
If the drive shaft 21 is inclined, the roller 3 is less likely to be skewed.

The present invention is not limited to the above embodiment. For example, the spring 4 is not limited to a Z-shape, and in short, a portion that is detachably press-fitted to the retainer 2,
Any structure may be used as long as it has a portion that comes into contact with a line or surface along the longitudinal direction of the roller 3 and a portion that connects the two portions so that the relative positions of the two portions can be changed. The same applies to the structure of the one-way clutch. The flanges at both ends in the axial direction of the shell-shaped outer race 1 may be formed in substantially the same shape, and further, the configuration may not include the annular backing plate 20. Good.

[0022]

[Effects of the Invention] As described above, in the present invention, a spring excellent in wear resistance and fatigue resistance is mounted so as to be restrained to the retainer, so that the spring is held separately from the roller. Being able to incorporate it into a vessel can improve productivity. Moreover, as the retainer from the portion for mounting a spring by a structure in which a roller pocket and recess in the circumferential several positions of the cylindrical member becomes to have a sufficient rigidity, the posture of the spring is stable As a result, it becomes possible to exhibit a stable one-way clutch function, for example, making it difficult for the rollers to skew.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of a one-way clutch of the present invention.

FIG. 2 is a sectional view taken along the line (2)-(2) of FIG.

FIG. 3 is a perspective view showing a retainer and a spring.

FIG. 4 is a plan view showing a state where a spring is mounted on the retainer.

FIG. 5 is a plan view showing a state where a spring and a roller are mounted on the retainer.

[Explanation of symbols]

One of a shell-like outer race 2 cage 3 roller 4 recess 8 spring roller pockets 7 retainer spring 5 of the shell-shaped outer ring cam surface 6 cage
Arm part 9 The other arm part of the spring 10 Intermediate part of the spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical body having a plurality of cam surfaces which exhibit a one-way clutch function at an inner peripheral portion at a predetermined interval, and a plurality of cam surfaces which are held on an inner periphery of the cylindrical body and correspond to the same number of the cam surfaces.
Pockets and rollers penetrating radially in and out
A recess that opens radially outward is provided adjacent to the pocket
A cylindrical cage has a plurality of rollers which are respectively freely circumferentially rolling the roller pocket of the retainer housing, before listen beam surface the rollers held in the concave portion of the retainer A spring having a substantially Z-shape in plan view , which resiliently urges the lock side, and separates a roller pocket and a concave portion of the retainer in a circumferential direction.
The partition faces the roller pocket and the recess in the axial direction.
Protruding toward the center in the axial direction on the two inner walls
And one arm portion of the spring is provided in the recess of the retainer.
The intermediate part of the spring is further
The other arm of the spring is attached to the roller pocket
Make sure that the spring is positioned so that the spring
And the other arm of the spring is connected to a roller in a roller pocket.
A one-way clutch, wherein the one-way clutch is contacted by a line or a plane with respect to the one-way clutch.