JP2001153157A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent butting of the edge of spring pieces against a roller, and obtain a sufficient deflection margin of the spring pieces in a one-way clutch for integrally arranging the required number of spring pieces in an annular part, energizing the roller in a pocket by the spring pieces and pressing the roller to an inclined face of the pocket. SOLUTION: A rising bending line 13 of respective spring pieces 9 for constituting a clutch spring 2 is set in a position offset by a specific quantity (a) to the base part 12 side of the spring pieces 9 with a radial line of equal angle intervals equally divided into the roller number as a reference position A so that an edge angle of the spring pieces 9 to a roller becomes zero.

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, and more particularly to a metal spring piece.

[0002]

2. Description of the Related Art As a one-way clutch of this type, the present inventors have previously disclosed Japanese Patent Application No. 7-252511 (Japanese Patent Application Laid-Open No. 9-8 / 1995).
No. 9011). In the one-way clutch according to this patent application, as shown in FIGS. 9 to 14, pockets 10 are provided at regular intervals on the inner peripheral surface of the outer race 1, and rollers 3 are inserted into the pockets 10, and The bottom surface of each pocket is formed with an inclined surface in which the gap is narrowed in one direction of rotation (see the angle θ in FIG. 11). Is provided. The metal spring piece 9 is stored in the above-mentioned spring storage recess 8, and the roller 3 is urged by the spring piece 9 and pressed against the inclined surface. Both end surfaces of the pocket 10 of the outer race 1 are closed by the lid member 4 and the exterior body 5.

The opening width W of the pocket 10 (see FIG. 11)
The roller 3 is formed to be smaller than the diameter of the roller 3, and a part of the roller 3 is partially exposed from the opening and contacts the shaft 6.

The lid 4 may be fitted to the outer race 1 by any means, but in the case shown in the figure, 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 of the end portion of the cylindrical portion 17. The cover 21 is attached by fitting a rib 21 on the outer peripheral surface of the lid 4.

[0005] 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 the above case, the closed end face 18 is formed on the exterior member 5 in order to close one end of the pocket 10 of the outer ring 1, but it may be closed with an independent lid. A closed wall may be formed in the pocket 10 itself.
Further, the cylindrical portion 17 and the lid 4 are integrated, and a closed lid fitted to the cylindrical portion 17 or the outer ring 1 is used instead of the closed end face 18, or a closed wall is formed in the pocket 10 itself of the outer ring 1. May be adopted.

The one-way clutch having the above configuration is used by inserting the shaft 6 into the inner diameter side of the outer race 1 and is used for the pocket 1.
A wedge-shaped cavity 7 is formed between the 0 inclined surface and the shaft 6.
In a normal state, the roller 3 is fixed to the wedge-shaped space 7 by the spring piece 9.
And is pressed against the inclined surface. When the shaft 6 rotates in the biasing direction (see the arrow in FIG. 10), the shaft 6 is locked and the torque of the shaft 6 is transmitted to the outer ring 1 and the exterior body 5 integrated therewith. When the shaft 6 rotates in the reverse direction, the roller 3 moves to the wider side of the wedge-shaped cavity 7 while compressing the spring piece 9,
The lock is released and the shaft 6 idles.

By the way, each metal spring piece 9 has its base 12 integrated with the metal ring 11, thereby forming one clutch spring 2. The clutch spring 2 is formed by stamping a single elastic metal plate, and FIG. 14 shows the stamped state. The length of the spring piece 9 is indicated by L, and the punching radius of the material is indicated by R.

The above-mentioned ring portion 11 has an inner diameter substantially equal to the inner diameter of the outer ring 1, and in the illustrated case, seven spring pieces 9 are set up at equal intervals in the circumferential direction on the outer circumferential portion of the ring portion 11. Bases 12 are provided.

In each base 12, the center point O of the ring 11
Is provided on a radial line at equal angular intervals divided into seven equal parts by the number of rollers 3 at an angle α, and a rising bending line 13 of the spring piece 9 is further provided between the rising bending line 13 and the inner diameter.
A connection portion 14 with another adjacent base portion 12 is provided.

The spring pieces 9 extend in a direction perpendicular to the rising and bending line 13 and along the oblique side 15 of the adjacent base 12, and each spring piece 9 mutually extends around the ring 11. It protrudes in an impeller shape at a fixed angle β (= α).

An intermediate folding line 16 parallel to the rising bending line 13 is provided at an intermediate portion of each of the spring pieces 9, and the spring piece 9 is vertically raised from the base 12 by the rising bending line 13. It is folded toward the base 12 by the intermediate folding line 16 (see FIG. 14B), and the folded tip is pressed against the roller 3 (see FIG. 12).

[0013]

In the one-way clutch constructed as described above, the angle of the inclined surface of the pocket 10 and the roller 3
13, the tip of the spring piece 9 with respect to the roller 3 may come into contact with the edge at the point B, as shown in FIG. The edge angle in that case is denoted by δ.

The depth direction Y of the spring storage recess 8
_1, the angle ε is generated between the longitudinal direction Y ₂ of the spring piece 9,
The spring piece 9 may interfere at a point C on the inner wall of the storage recess 8 or the like. When such interference occurs, the deflection allowance m in which the spring piece 9 is compressed is limited.

If the spring piece 9 comes into contact with the edge as described above or interferes with the spring accommodating recess 8, the roller 3 cannot be correctly pressed against the inclined surface of the pocket 10 of the outer ring 1, and the spring piece 9 The deflection allowance m of No. 9 is too small to exert an appropriate spring load.

In view of the above, the present invention aims to improve the clutch performance by preventing the edge contact of the spring piece so that the roller can be correctly pressed against the inclined surface, and the allowance of the spring piece to be sufficiently large. As an issue.

[0017]

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 race, and rollers are inserted into the pockets. An inclined surface is formed on the bottom surface of the pocket so that the gap is narrowed in one direction of rotation. A spring for urging the roller in the direction of the inclination is stored in each pocket, and both end surfaces of the outer ring pocket are closed with lid members. And the opening width of the outer ring inner peripheral surface side of the pocket is formed smaller than the diameter of the roller,
The one-way clutch, wherein the spring is formed by a metal spring piece provided at a fixed interval corresponding to each pocket and a metal ring part integrally connected to one end of each spring piece, The base of each spring piece is formed on the outer periphery of the ring part, and the spring piece is bent from one end of each base to stand up,
The rising bending line of the spring piece is set at a position offset by a predetermined amount toward the base side of the spring piece with reference to a radius line at equal angular intervals equally divided by the number of rollers.

It is sufficient that the spring is relatively rotated with respect to the outer ring so that the edge angle of the spring piece with respect to the roller when the offset amount is raised at the reference position is zero or substantially zero. Can be set to size. Also, a configuration in which the tip of the spring piece is pressed against the intermediate portion in the longitudinal direction of the roller, or the spring piece and the ring portion are formed by punching a single metal plate, and the spring piece is bent by bending the spring piece. It is possible to adopt a configuration that stands up to the annulus.

[0019]

The above one-way clutch is used by inserting a shaft into the inner diameter side of the outer ring and fitting the outer body to the outer diameter surface of the outer ring. Under normal conditions, the rollers are biased in a narrow direction of a wedge-shaped cavity formed between the inclined surface of the pocket and the shaft. When the shaft rotates in the biasing direction, the shaft is locked, and the torque of the shaft is transmitted to the outer race and the exterior body integral 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 runs idle.

Since the rising bending line of the spring piece is offset from the reference position as described above, the spring piece is prevented from hitting the edge of the roller, and the roller is pressed against the inclined surface of the pocket in a correct posture. Further, since the angle between the depth direction of the spring storage recess and the length direction of the spring piece is zero or small, interference of the spring piece with the storage recess is prevented, and the deflection allowance is sufficiently ensured. .

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 to 5, the configuration of the one-way clutch of the embodiment is the same as that of the above-described conventional case except for the configuration of the clutch spring 2. The description is omitted, and the repeated description is omitted. Hereinafter, the clutch spring 2 will be described.

The clutch spring 2 is basically composed of a ring portion 11 and a number of spring pieces 9 corresponding to the number of the pockets 10, that is, the number of the rollers 3, as in the conventional spring (FIG. 1). 1). As shown in FIG. 5, the clutch spring 2 is formed by stamping a single elastic metal plate, and the ring portion 11 has an inner diameter substantially equal to the inner diameter of the outer ring 1. A base portion 12 is provided on the outer peripheral portion of the ring portion 11 for standing up the spring pieces 9 at equal intervals in the circumferential direction.

The base 12 is provided with a rising bending line 13 of the spring piece 9. The position of the rising bending line 13 is different from the conventional case. That is, the center point O of the ring 11
Is a reference line A (see FIG. 5 (b)).
The rising bending line 13 is set at a position A ′ offset from the base 12 by a fixed distance a. Between the bending line 13 and the inside diameter, another adjacent base 1
2 is provided.

The length of each spring piece 9 is L as in the prior art, and is perpendicular to the above-described rising and folding line 13.
In addition, it extends along the oblique side 15 of the adjacent base portion 12 and protrudes around the ring portion 11 in an impeller shape at a certain angle β (= α).

In the case of this embodiment, since the material is offset toward the base 12 by a fixed amount a as described above, the material is punched with a radius R '(<R, R is a conventional example shown in FIG. 4).
It is.

An intermediate fold line 16 parallel to the rising fold line 13 is provided at an intermediate portion of each spring piece 9. The intermediate fold line 13 is set up at a right angle from the base 12 by the fold line 13. By base 1
It is folded back to two sides (see FIG. 5C). 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 and removed from each pocket 10 from one end face of the outer race 1, and the ring 11 is applied to the end face of the outer race 1 (see FIG. 4).

After the above-mentioned spring 2 is mounted, the tip of the roller 3 is inserted from the opposite end face of the outer ring 1 while pressing the tip of the bent portion of the spring piece 9, and finally the tip of the spring piece 9 Is pressed against an intermediate portion of the roller 3 in the longitudinal direction.

The state of the tip of the spring piece 9 pressed against the roller 3 as described above will be described with reference to FIG. 6 in comparison with the conventional case.

FIG. 3A shows the case of the conventional example. Each spring piece 9 is set up on an equiangular radius line divided into seven, and the bending line 1 is formed.
3 is set and folded, and then folded back at the intermediate folding line 16, and the leading end thereof is pressed against the roller 3.
As described above, the tip end of the spring piece 9 comes into contact with the roller 3 at an edge having an edge angle δ.

FIG. 2B shows a state in which the roller 3 (or the outer ring 1 integral therewith) is fixed in the state shown in FIG. This shows a state where the position of the line 13 is set as a reference position A at a position offset by a fixed amount a toward the base 12 side. As a result of the above offset, the tip of the spring piece 9 is separated from the roller 3 by an angle δ ′. Actually, the spring piece 9 is the roller 3
Although there is no mounting state of the clutch spring 2 that leaves the vehicle, such a state is imagined for convenience of understanding.

FIG. 3C shows that the clutch spring 2 is rotated with respect to the roller 3 (or the outer ring 1 integral therewith) by an angle δ ′ from the state shown in FIG. This is a state in which the roller 3 is in contact with the roller 3 with m ′, and is the case of this embodiment. In this case, the center of the leading end comes into contact with the roller 3, and the edge angle δ becomes zero or substantially zero, so that there is no edge contact.

Further, as shown in FIG.
The depth direction Y _1, the angle of the longitudinal direction Y ₂ of the spring piece 9 is sized at or near zero. For this reason, the spring piece 9
Of the spring storage recess 8 is avoided, and a large deflection allowance m '(> m) is obtained.

The offset amount a is determined in consideration of the number, diameter, etc. of the rollers 3. If the amount a is too small, the edge contact cannot be eliminated. A hit occurs. In short, clutch spring 2
Δ ′ as a margin for rotating the roller 3 with respect to the roller 3
Should be large enough to eliminate the edge angle δ. In other words, the magnitude of the offset amount a is set so that the edge angle δ of the spring piece 9 with respect to the roller 3 when the spring piece 9 is raised at the reference position A becomes zero or substantially zero. Spring 2 is connected to outer ring 1
Is set to a size sufficient for relative rotation with respect to.

Note that the above-described offset is caused not only when the parallel movement is performed from the reference position A, but also when the position A ′ is shifted from the reference position A.
It is an allowable range to incline about ± 5 ° with respect to.

The operation of the one-way clutch having the above configuration is the same as that of the conventional example.

FIG. 8 is a plan view of another embodiment when the clutch spring 2 is punched out, in which the number of spring pieces 9 is set to five in accordance with the number of rollers 3. Other configurations are the same as those described above.

[0039]

As described above, in the one-way clutch of the present invention, the position of the rising bending line of the spring piece of the clutch spring is determined with reference to the radial lines at equal angular intervals equally divided by the number of rollers. By setting the spring piece at a position offset by a predetermined amount from the base side of the spring piece, the tip of the spring piece is prevented from hitting the edge against the roller, and the roller can be correctly pressed against the inclined surface inside the pocket. In addition, since the spring piece can be prevented from interfering with the spring storage recess, the deflection of the spring piece can be made sufficiently large.

Further, since the punched diameter of the material is reduced by the offset, the material can be effectively used. Further, the tip of the spring piece is brought into contact with the intermediate portion in the longitudinal direction of the roller, whereby the inclination of the roller is prevented, and the roller can be pressed in a correct posture against the inclined surface of the pocket.

[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;

5A is a plan view of the clutch spring when punched out, FIG. 5B is a partially enlarged plan view of the same, and FIG.

FIGS. 6A to 6C are explanatory diagrams of a positional relationship between a clutch spring and a roller.

FIG. 7 is a partially enlarged sectional view of the above.

FIG. 8 is a plan view when punching a clutch spring according to another embodiment.

FIG. 9 is an exploded perspective view of a conventional example.

FIG. 10 is a sectional view of the above.

FIG. 11 is a partially enlarged sectional view of the above.

FIG. 12 is a sectional view taken along line XX of FIG. 11;

FIG. 13 is a partially enlarged sectional view of the above.

14A is a plan view of the clutch spring when punched out, and FIG. 14B is a side view of the spring piece in the folded state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Spring 3 Roller 4 Lid 5 Exterior member 6 Shaft 7 Wedge space 8 Concave part 9 Spring piece 10 Pocket 11 Ring part 12 Base 13 Rise bending line 14 Connecting part 15 Oblique side 16 Intermediate bending line 17 Cylindrical part 18 Closed end face 19 fitting groove 21 rib 22 engaging rib 23 engaging groove 24, 25 shaft hole

Claims (4)

[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. Is stored in each pocket, the both end surfaces of the pocket of the outer ring are closed with lid members, and 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. In a one-way clutch, the spring is formed by a metal spring piece provided at a fixed interval corresponding to each pocket and a metal ring part integrally connected to one end of each spring piece. A base of each spring piece is formed on an outer peripheral portion of the ring portion of the spring, and the spring piece is bent from one end of each base to start up, and a rising bending line of the spring piece is equally divided into the number of the rollers. Radius lines at equal angular intervals as reference positions A one-way clutch set at a position offset by a predetermined amount from the base side of the spring piece. 2. The method according to claim 1, further comprising: rotating the spring relative to the outer race such that the edge angle of the spring piece with respect to the roller when the offset amount is raised at the reference position becomes zero or substantially zero. The one-way clutch according to claim 1, wherein the one-way clutch is set to a size. 3. The one-way clutch according to claim 1, wherein a tip end of the spring piece is pressed against an intermediate portion in a longitudinal direction of the roller. 4. The method according to claim 1, wherein the spring piece and the ring are formed by punching a single metal plate, and the spring piece is bent and raised with respect to the ring. The one-way clutch according to any one of the above.