JPH11153151A - One-way racing torque limiter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correspond the magnitude of a torque value and miniaturization by preventing slip-off of a rolling body built-in type one-way clutch and a torque limiter to fitting parts formed on both ends of a coupling, and inserting them, and connecting both torque transmitting members to each other in the coupling by means of recessed and projection-fitting of an axial direction. SOLUTION: An one-way clutch 1 is inserted into a clutch fitting part 38 of a coupling 3, and a screw thread 19 of the one-way clutch 1 is screwed and connected around/to a screw groove 39 of the clutch fitting part 38. A projection part 30 of an inner ring 27 in the torque liminter 2 is inserted into a torque limiter fitting part 41 of the coupling 3 while pushing-down a clutch ball 44 inward, and a fitting projection part 26 of the one-way clutch 1 is fitted into a fitting recessed part 36 of the torque limiter 2. The inner end of the clutch groove 43 is closed by the one-way clutch 1, the clutch ball 44 is not slipped off in an axial direction. By using, a rolling body built-in type one-way clutch correspondence is performed even if the torque value of the torque limiter exceeds in a large level, or the torque limiter is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way idling torque limiter used for a paper feeding or conveying mechanism of a facsimile, a copying machine, or the like.

[0002]

2. Description of the Related Art The present applicant has previously filed a patent application for Japanese Patent Application No. 7-253315 (Japanese Patent Application Laid-Open No. 9-88997) as a one-way idle type torque limiter used for office machines such as fax machines. The one-way idling torque limiter according to this patent application includes a combination of a spring-type torque limiter and a spring-type one-way clutch. This one-way slip type torque limiter has the advantage that it can slip with a smaller torque than the conventional one.

[0003]

However, the one-way idling type torque limiter according to the above-mentioned application uses a spring-type one-way clutch inside, and the clutch spring is connected to the outer diameter of the inner ring of the torque limiter and the inner diameter of the coil spring. Since there is employed a configuration in which the clutch spring is wound between them, there is a structural limitation that the wire diameter of the clutch spring cannot be increased and the number of windings cannot be increased. In addition, when the torque limiter is reduced in size, the clutch spring must be reduced accordingly, and it may be difficult to manufacture such a small size clutch spring.

Therefore, the present invention uses a one-way clutch with a built-in rolling element, which has a high track record of use in the past, and can produce a product of any size, thereby increasing the torque value of the torque limiter and reducing the size of the torque limiter. It is an object of the present invention to provide a one-way idling type torque limiter that can cope with the change in the torque.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a combination of a one-way clutch and a torque limiter coaxially arranged with the one-way clutch. In the one-way idling torque limiter set so that the one-way clutch is locked when rotating in the same direction as the rotating direction and idle when rotating in the opposite direction, the one-way clutch includes a rolling element as the one-way clutch. Using a torque limiter, the one-way clutch and the above-mentioned torque limiter are inserted into the fitting portions at both ends of the coupling while retaining the fittings, and inside the coupling, the one-way clutch and the torque limiter are removed. In this configuration, the torque transmission members are connected to each other by fitting in the axial direction.

It is to be noted that one fitting portion of the coupling has a thread groove on its inner peripheral surface, and the other fitting portion needs to be deeper on its inner peripheral surface toward the inside of the coupling. It is possible to adopt a configuration having a linear clutch composed of a number of clutch grooves and clutch balls fitted in the respective clutch grooves.

In the one-way clutch, a pocket is provided at a constant interval on an inner peripheral surface of the clutch wheel, and an inclined surface which becomes shallow in a rotational direction at the time of torque transmission is formed on a bottom surface of the pocket. A spring for urging the rotating body housed in the above-mentioned inclined surface in a direction to make the inclined surface shallower is inserted into each pocket, and the clutch wheel is housed in an exterior body which rotates integrally therewith, and one open end face of the exterior body And a concave / convex fitting portion with the torque limiter is provided on the other closed surface, and the torque limiter is provided around the outer ring, the inner ring housed inside the outer ring, and the inner ring. And a coil spring in a winding direction in which the binding force is reduced by the torsional force in the rotation direction during the torque transmission, and both ends of the coil spring rotate integrally with the outer ring or the outer ring. Engaged in wood, can also be employed provided comprising forming serrated fitting portion between the one-way torque limiter in one direction torque limiter side of the projecting end of the inner ring.

[0008]

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

As shown in FIGS. 1 and 2, the one-way idling torque limiter according to the embodiment comprises a roller-type one-way clutch 1, a spring-type torque limiter 2, and a coupling 3 for connecting the two. .

As shown in FIG. 4, the roller type one-way clutch 1 comprises a clutch wheel 4, a spring 5, a roller 6, an exterior member 7 and a lid 8. The clutch wheel 4 has a shaft 11
Pockets 9 are formed at regular intervals on the inner peripheral surface having a diameter conforming to (see FIG. 3A) between both end surfaces of the clutch wheel 4. The bottom surface of each pocket 9 is inclined such that the shaft 11 is shallow in the direction in which the shaft 11 rotates in the torque transmitting direction (rightward rotation when viewed from the one-way clutch 1 toward the coupling 3; see the arrow A in FIG. 3A). Thus, a wedge-shaped space 12 is formed.

A roller 6 is inserted into the pocket 9 and a spring piece 13 of the spring 5 is inserted into a concave portion 10 of a wall of a wide portion of the wedge-shaped space 12 of the pocket 9. 13 urges the roller 6 in the narrow direction of the wedge-shaped space 12. The roller 6 is partially exposed at the opening on the inner peripheral surface of the pocket 9 and contacts the shaft 11.

As shown in FIG. 4, the spring 5 is composed of an annular portion 13 'and a number of spring pieces 13 corresponding to each pocket 9. The annular portion 13' has an inside diameter substantially equal to the inside diameter of the clutch wheel 4. . Each spring piece 13 is cut and raised from the ring portion 13 ',
It is folded in half in the middle and inserted into each pocket 9. The tip portion of each spring piece 13 is pressed against the roller 6 to urge the roller 6 in a certain direction as described above.

The exterior member 7 has a closed end face 15 formed at one end face of the cylindrical body 14, and a shaft insertion hole 16 is provided at a central portion of the closed end face 15. The assembly of the clutch wheel 4 and the spring 5 is housed in the exterior member 7 described above. The axial engagement rib 17 formed on the inner peripheral surface of the exterior member 7 and the axial engagement groove 18 formed on the outer peripheral surface of the clutch wheel 4 mutually engage to prevent rotation. A thread 19 for engagement with the coupling 3 is formed on the outer peripheral surface of the cylindrical body 14. In addition, a pair of fitting projections 26 are protrudingly provided on the outer surface of the closed end face 15.

The cover 8 has a shaft insertion hole 21 formed in the center thereof, and a rib 22 for retaining the outer circumferential surface formed in the circumferential direction.
The outer member 7 is engaged with the circumferential groove 24 at the open end.

In the one-way clutch constructed as described above, when the shaft 11 inserted in the one-way clutch rotates in the direction of arrow A in FIG. Is transmitted. When the shaft 11 rotates in the opposite direction to the above, the roller 6 overcomes the biasing force of the spring piece 13 and moves to the wider side of the wedge-shaped cavity 12. For this reason, the shaft 11 idles, and the transmission of torque is interrupted.

On the other hand, as shown in FIG. 1, the spring type torque limiter 2 has an outer ring 28 rotatably fitted to the outer side of an inner ring 27 through which the shaft 11 is inserted. It is rotatably supported by a concave portion 23 formed on the inner surface. The other end of the inner ring 27 is supported by the inner peripheral surface of an adjustment ring 35 press-fitted with a strong frictional force into the open end of the outer ring 28, and the protrusion 3 protrudes outside from the adjustment ring 35.
0 is provided with a fitting recess 36.

A small diameter portion 31 of a right-handed coil spring 29 is tightened on the outer peripheral surface of the inner ring 27, and the coil spring 29
The bent portion 32 formed at one end on the small diameter side is engaged with the closed end face 33 of the outer ring 28, and the bent portion 34 formed at the other large diameter side is engaged with the adjustment ring 35 of the outer ring 28. doing.

An engaging projection 37 for engaging with an external member is provided on the outer surface of the closed end surface 33 of the outer ring 28.

The torque limiter 2 is as described above. Now, when the inner race 27 rotates in the torque transmitting direction (in the direction of the arrow A, ie, clockwise as viewed from the one-way clutch 1), the inner race 27 is rotated. The torque is transmitted to the external member via the coil spring 29 in which the small diameter portion 31 is tied to the inner ring 27, the outer ring 28, and the engagement convex portion 37 of the outer ring 28. Here, if a large torque is generated due to foreign matter biting or the like on the outer member side, the diameter reducing action of the small diameter portion 31 is limited, the binding force is reduced, and the inner ring 27 slides and rotates with respect to the outer ring 28, and the torque is reduced. Transmission is interrupted.

Conversely, when the inner ring 27 rotates in the opposite direction to the above, the end of the coil spring 29 is locked to the outer ring by the bent portion 32, so that the small diameter portion 31 of the coil spring 29 reduces the diameter. Then, the binding force on the inner ring 27 increases, and the locked state is established.

The above description has been made on the case where the torque is transmitted when the shaft 11 rotates clockwise. However, when the torque is transmitted when the shaft 11 rotates counterclockwise, a left-handed coil spring 29 is used.

In the above description, the case where the torque is transmitted from the shaft 11 to the outer ring 28 is described, but the same applies to the case where the torque is transmitted in the opposite direction.

Next, the coupling 3 is formed in an annular shape as shown in FIGS. 1, 2 and 5, and has an inner peripheral surface at one end thereof which is engaged with the outer member 7 of the one-way clutch 1. A coupling portion 38 is provided, and a thread groove 39 to be screwed with the thread 19 of the exterior member 7 is formed in the clutch coupling portion 38.

A torque limiter fitting portion 41 is provided on the inner peripheral surface of the other end of the coupling 3 so as to be coupled to the protruding end 30 of the inner ring 27 of the torque limiter 2. The diameter of the torque limiter fitting portion 41 is slightly smaller than that of the clutch fitting portion 38, and the step portion 42 is formed by a difference in the diameter.
Is formed on the inner peripheral surface of the coupling 3.

On the inner peripheral surface of the torque limiter fitting portion 41, an axial clutch groove 43 extending from the opening end of the fitting portion 41 to the step portion 42 at a predetermined interval as shown in FIGS. And the required number is provided. Each clutch groove 43 is formed in a circumferential direction on an inclined surface that becomes shallower toward the torque limiter 2 side, and a clutch ball 44 is housed therein.
Each clutch ball 44 is partially exposed from the clutch groove 43. The above-described clutch groove 43 and clutch ball 44
Constitutes the linear clutch 45.

When the projection 30 of the torque limiter 2 is inserted into the linear clutch 45 having the above-described structure, the clutch ball 44 moves to a deep portion of the clutch groove 43, so that the projection 30 is obstructed by the clutch ball 44. It can be inserted freely without any. However, torque limiter 2
If the torque limiter 2 is pulled out, the clutch ball 44 bites between the clutch groove 43 and the protruding portion 30, so that the torque limiter 2 cannot be pulled out.

The both sides of the clutch groove 43 are
As shown in FIG. 5, the clutch ball 44 is inclined inward to prevent the clutch ball 44 from coming off in the radial direction.

The one-way clutch 1, the torque limiter 2 and the coupling 3 for coupling the two are as described above. When these are combined, the one-way clutch 1 is inserted into the clutch fitting portion 38 of the coupling 3. At the same time, the former screw groove 39 is screwed into the former screw groove 39 to be joined. The exterior member 7 is pressed against a step portion 42 inside the coupling 3 as shown in FIG.

The torque limiter 2 has a projection 30 of the inner ring 27 and a torque limiter fitting portion 4 of the coupling 3.
1, the clutch ball 44 is inserted while being pushed inward, and the fitting projection 26 of the one-way clutch 1 is inserted therein.
The fitting recess 36 of the torque limiter 2 is fitted. Since the inner end of the clutch groove 43 is closed by the one-way clutch 1, the clutch ball 44 does not come off in the axial direction.

The one-way clutch 1 and the torque limiter 2 are
When assembling around the shaft 11 via the coupling 3 as described above, if there is a radial displacement between the one-way clutch 1 and the torque limiter 2, the clutch ball 44 of the coupling 3 will be disengaged from the clutch groove 43. By moving to a deeper position, the displacement in the radial direction can be absorbed and the coaxial state can be maintained.

In the above-described one-way idling torque limiter, the shaft 11 rotates in the torque transmission direction of the one-way clutch 1 (clockwise rotation, that is, the direction of arrow A in FIG. 3A) to lock the clutch 1. In the state, the fitting protrusion 26 and the fitting recess 36 together with the exterior member 7 rotating in the same direction as the shaft 11 are provided.
As a result, the inner ring 27 rotates clockwise, and the torque is transmitted to the external member via the inner ring 27, the coil spring 29, the outer ring 28, and the engaging projection 37. As described above, when a large torque is generated in the external member, the binding force of the small-diameter portion 31 of the coil spring 29 is reduced, and the inner ring 27 is idled with respect to the outer ring 28, thereby interrupting the transmission of torque.

When the shaft 11 rotates counterclockwise, the one-way clutch 1 interrupts the transmission of torque, and the shaft 11 idles.

The above operation is the same when transmitting torque to the shaft 11 from the external member via the torque limiter 2 and the one-way clutch 1.

[0034]

As described above, according to the present invention, the use of a rolling element built-in type one-way clutch as the one-way clutch increases the torque value of the torque limiter or reduces the size of the torque limiter. However, the use of a one-way clutch with a built-in rolling element according to this can realize a one-way idling torque limiter.

Further, since the one-way clutch is connected to the torque limiter by a coupling having a built-in linear clutch, it is possible to easily perform axial connection and absorb radial displacement. Further, since the one-way clutch and the torque limiter are fitted by the concave / convex fitting, the transmission of torque is assured.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is an exploded perspective view of the above.

3A is a cross-sectional view taken along a line III-III in FIG. 1. FIG. 3B is a partial cross-sectional view taken along a line IV-IV in FIG.

FIG. 4 is an exploded perspective view of the same one-way torque limiter.

FIG. 5 is a partially omitted side view of the same coupling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 One-way clutch 2 Torque limiter 3 Coupling 4 Clutch wheel 5 Spring 6 Roller 7 Exterior member 8 Lid 9 Pocket 11 Shaft 12 Wedge-shaped space 13 Spring piece 13 'Ring part 14 Cylindrical body 15 Closed end face 16 Shaft insertion hole 17 Engagement Mating rib 18 Engagement groove 19 Thread 21 Shaft insertion hole 22 Circumferential rib 24 Circumferential groove 25 Vertical groove 26 Fitting protrusion 27 Inner ring 28 Outer ring 29 Coil spring 30 Projection part 31 Small diameter part 32 Folding part 33 Closed end face 34 Fold Curved portion 35 Adjusting ring 36 Fitting concave portion 37 Engaging convex portion 38 Clutch fitting portion 39 Screw groove 41 Torque limiter fitting portion 42 Step portion 43 Clutch groove 44 Clutch ball 45 Linear clutch

Claims (3)

[Claims] 1. A one-way clutch and a combination of a torque limiter coaxially arranged with the one-way clutch, wherein the one-way clutch is locked when the torque limiter rotates in the same direction as the rotation direction during torque transmission, In a one-way idling torque limiter set to be in an idling state when rotating in the opposite direction, a one-way torque limiter incorporating a rolling element is used as the one-way clutch, and the one-way clutch and the torque limiter are used. The couplings at both ends of the coupling are inserted into the coupling portions while retaining them, and inside the coupling, the one-way clutch and the torque transmitting member of the torque limiter are connected to each other by the concave and convex fitting in the axial direction. One-way idle type torque limiter. 2. The coupling according to claim 1, wherein one of the fitting portions has a thread groove on an inner peripheral surface thereof, and the other fitting portion has an inner peripheral surface that becomes deeper toward the inside of the coupling. The one-way idle type torque limiter according to claim 1, further comprising a linear clutch including a number of clutch grooves and clutch balls fitted into the respective clutch grooves. 3. The one-way clutch according to claim 1, wherein a pocket is provided at a constant interval on an inner peripheral surface of the clutch wheel, and an inclined surface which becomes shallow in a rotation direction at the time of torque transmission is formed on a bottom surface of the pocket. Insert the spring that biases the rotating body stored in the above-mentioned inclined surface into the shallow direction into each pocket,
The clutch wheel is housed in an exterior body that rotates integrally therewith, a lid is fitted on one open end face of the exterior body, and an uneven fitting portion with the torque limiter is provided on the other closed face. The above-mentioned torque limiter is wound around the outer ring and the inner ring housed inside thereof with a predetermined binding force around the inner ring, and both ends are engaged with the outer ring, and the rotation direction at the time of the torque transmission. A coil spring having the same winding direction, and both ends of the coil spring are engaged with the outer ring or a member that rotates integrally with the outer ring. 2. A concave and convex fitting portion is provided.
Or the one-way idling torque limiter according to 2.