JP3270667B2 - 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 suitable for office machines such as a fax machine and a copying machine.

[0002]

2. Description of the Related Art A known one-way clutch of this type is disclosed in Japanese Utility Model Publication No. Hei 6-10230. This one-way clutch inserts a roller into a wedge-shaped space formed in the pocket of the outer ring, fits on the lid of the outer ring,
A spring piece for urging the roller in one direction and a roller holding piece for preventing the roller from falling off in the inner diameter direction are integrally provided on the inner surface of the lid. The lid, the spring piece and the roller holding piece are integrally formed of a synthetic resin.

[0003]

The one-way clutch constructed as described above has a small number of parts and a simple structure because the lid, the spring piece and the roller holding piece are integrally formed of synthetic resin as described above. In addition, there is an advantage that it can be manufactured at low cost.

However, the component of the clutch includes a spring made of a synthetic resin part, and the spring is greatly affected by the ambient temperature. Therefore, the maximum operating temperature is about 80 ° C.

On the other hand, there is also known a one-way clutch in which a retainer made of a synthetic resin is incorporated in an outer race, the rollers are held by the retainer, and a metal spring corresponding to each roller is accommodated in the retainer. In this case as well, since the retainer is made of synthetic resin, the same problems as described above occur, and also the number of parts increases and the assembly cost increases.

Accordingly, the present invention has a small number of parts,
Another object of the present invention is to provide a one-way clutch that can be used at a high temperature.

[0007]

In order to achieve the above object, a one-way clutch according to the present invention is provided with pockets at fixed intervals on an inner peripheral surface of an outer ring, and a roller is inserted into the pockets. A slope is formed on the bottom surface of the pocket so that the gap is narrowed in one direction of rotation, springs for urging the roller in the direction of the inclination are stored in each pocket, and both end surfaces of the outer ring pocket are closed with lid members. In the one-way clutch, the opening width of the pocket on the inner peripheral surface side of the outer ring is formed smaller than the diameter of the roller, and the spring is provided with a metal spring piece provided at a constant interval corresponding to each pocket. And a metal ring formed by integrally joining one end of each spring piece.

[0008] The above-mentioned spring piece may be configured so that its tip is bent and turned back toward the ring.

Further, the spring piece and the ring portion may be formed by punching a single metal plate, and the spring piece may be bent to stand up with respect to the ring portion.

[0010]

The above-mentioned one-way clutch is used by inserting a shaft into the inner diameter side of the outer ring, fitting the outer body to the outer diameter surface of the outer ring, and providing a wedge between the inclined surface of the pocket and the shaft. Form a void. In a normal state, the roller is biased by a spring in a narrow direction of the wedge-shaped space, and when the shaft is rotated in the biasing direction, the roller is locked and the torque of the shaft is transmitted to the outer ring and the outer casing integrated therewith.

When the shaft is rotated in the reverse direction, the roller is moved to the wider side of the wedge-shaped cavity while compressing the spring, so that the lock is released and the shaft idles.

In the present invention, the above-mentioned spring is made of metal, and the other parts are also made of metal, so that the operating temperature can be improved. In addition, the roller inserted into the pocket of the outer ring has a smaller opening width than the diameter of the roller, so that the roller is prevented from falling off.

[0013]

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

As shown in FIG. 1, the one-way clutch of the present invention comprises an outer race 1, a spring 2, a roller 3, a lid 4, and an exterior member 5.

The outer race 1 is made of a sintered metal, and as shown in FIG. 2, pockets 10 are formed at both ends of the inner race at regular intervals. The bottom surface of the pocket 10 is inclined in a certain direction to form a wedge-shaped cavity 7 having an angle θ with the axis 6 (see FIG. 3).

The roller 3 is inserted into the wedge-shaped space 7, and the spring piece 9 of the spring 2 is inserted into a recess 8 communicating with a wide portion of the wedge-shaped space 7. The spring piece 9 is pressed against the roller 3 (see FIG. 4) to urge the roller 3 in the narrow direction of the wedge-shaped space 7.

The width W (see FIG. 3) of the opening of the pocket 10 is formed smaller than the diameter of the roller 3. The roller 3 is partially exposed from the opening and comes into contact with the shaft 6. Before being inserted into the shaft 6, the roller 3 does not come out inward.

As shown in FIG. 1, the spring 2 has a ring 11
And the number of spring pieces 9 corresponding to each pocket 10. As shown in FIG. 5, the spring 2 is formed by stamping a single elastic metal plate, and the ring portion 11 has an inside diameter substantially equal to the inside diameter of the outer ring 1. A base portion 12 is provided on the outer peripheral portion of the portion 11 at equal intervals in the circumferential direction for raising the spring pieces 9.

The base portion 12 is provided with a bending line 13 of the spring piece 9 on a radius line equally divided around the center point O of the ring portion 11 at an angle α. A connection portion 14 with another base portion 12 is provided.

The spring pieces 9 extend in a direction perpendicular to the above-mentioned bending line 13 and along the oblique side 15 of the adjacent base 12, and each spring piece 9 is fixed to each other around the ring 11. It protrudes like an impeller at an angle β.

An intermediate bending line 16 parallel to the bending line 13 is provided at an intermediate portion of each of the spring pieces 9. The intermediate bending line 16 is raised 90 degrees from the base 12 by the bending line 13. By base 1
It is folded back to two sides (see FIG. 5B). The turning angle γ is appropriately set in consideration of the urging force applied to the roller 3.

In the spring 2 having the above structure, each spring piece 9 is inserted into each pocket 10 from one end face of the outer ring 1 and the ring portion 11 is applied to the end face of the outer ring 1 (see FIG. 4).

After the above-mentioned spring 2 is mounted, the tip of the roller 3 is inserted into the bent portion of the tip of the spring piece 9 from the opposite end face of the outer ring 1 while being pressed.

The cover 4 may be fitted to the outer race 1 by any means, but in the illustrated case, it is fitted to the exterior member 5. That is, the cylindrical portion 17 of the exterior member 5 is put on the outer race 1, one end surface of the outer race 1 is closed by the closed end surface 18 of the exterior member 5, and a fitting groove 19 formed on the inner peripheral surface at the end of the cylindrical portion 17. The cover 21 is attached by fitting a rib 21 on the outer peripheral surface of the lid 4.

On the inner peripheral surface of the cylindrical portion 17 of the exterior member 5,
An engagement rib 22 is formed in the axial direction, and is engaged with an engagement groove 23 on the outer peripheral surface of the outer ring 1 to prevent the outer ring 1 and the exterior member 5 from rotating. The lid 4 and the exterior member 5 are provided with shaft holes 24 and 25, respectively.

In order to close one end of the pocket 10 of the outer ring 1, the closed end face 18 is formed on the exterior member 5 in the above case, but it may be closed with an independent lid. A closed wall may be formed in the pocket 10 itself.

The one-way clutch having the above-described structure includes the shaft 6
And is used to transmit torque from the shaft 6 to the outer ring 1 and the outer casing 5 integrated therewith, or to transmit torque in the reverse direction.

Now, a case where torque is transmitted from the shaft 6 will be described. When the shaft 6 rotates in the direction in which the wedge space 7 of the pocket 10 becomes narrow as shown by the arrow A in FIG. It is locked in the empty space, and the torque is transmitted to the outer race 1 and the exterior body 5 through the rollers 3.

Conversely, when the shaft 6 rotates in the opposite direction with a torque equal to or greater than a predetermined value, the roller 3 overcomes the biasing force of the spring piece 9 and moves to the wider side of the wedge cavity 7. As a result, transmission of torque is interrupted, and the shaft 6 idles.

[0030]

As described above, in the one-way clutch of the present invention, the operating temperature can be improved because the spring comprising the ring portion and the spring piece is made of metal.

Further, since no roller holding member is required, the structure is simplified, and the cost can be reduced since the spring is formed as a single component.

The roller can be smoothly inserted into the pocket by folding back the tip of the spring piece.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment.

FIG. 2 is a sectional view of the above.

FIG. 3 is a partially enlarged sectional view of the above.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5A is a plan view of the spring when punched out. FIG. 5B is a side view of the spring piece folded back.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Spring 3 Roller 4 Lid 5 Exterior member 6 Shaft 7 Wedge empty space 8 Depression 9 Spring piece 10 Pocket 11 Ring part 12 Base part 13 Bending line 14 Connecting part 15 Oblique side 16 Middle bending line 17 Tube part 18 Closed end face 19 Fitting Mating groove 21 Rib 22 Engaging rib 23 Engaging groove 24, 25 Shaft hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16D 41/00-41/36

Claims (4)

(57) [Claims] 1. A pocket is provided at a constant interval on an inner peripheral surface of an outer ring, a roller is inserted into the pocket, and an inclined surface is formed on a bottom surface of the pocket so that a gap is narrowed in one direction of rotation. In a one-way clutch in which a spring for urging the pocket in the direction of its inclination is accommodated in each pocket, and both end surfaces of the pocket of the outer ring are closed with lid members, the opening width of the pocket on the inner peripheral surface side of the outer ring is set as described above. The spring is formed to be smaller than the diameter of the roller, and the spring is provided with a metal spring piece provided at a predetermined interval corresponding to each pocket, and a metal ring part integrally connected to one end of each spring piece . Formed by punching a metal plate
Then, the base of each spring piece is formed on the outer periphery of the ring, and
Bend the spring piece from one end of the
Set the bend line on an equiangularly spaced radius line passing through the center of the annulus
Then, an intermediate bending line parallel to the bending line is provided at an intermediate portion of the spring piece, the portion from the intermediate bending line to the tip is folded back to the base side, and the spring piece is inserted into each pocket, and the ring portion is connected to the outer ring. A one-way clutch, wherein the roller is inserted into an end face of the spring piece from an end face opposite to the end face and brought into contact with a bent end of the spring piece. 2. One of the lid members that closes both end surfaces of the pocket of the outer ring is a closed end surface of the exterior body covering the outer ring, and the other is a lid fitted to the exterior body. The one-way clutch according to claim 1, wherein: 3. The one-way clutch according to claim 1, wherein said lid member for closing one end surface of said outer ring pocket is a closing wall formed in said outer ring pocket itself. 4. The one-way clutch according to claim 1, wherein the lid member that closes one end surface of the pocket of the outer ring is a lid fitted to the outer ring.