JP2016017560A - Reverse input prevention clutch unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverse input prevention clutch unit which can coaxially arrange two pieces of reverse input prevention clutches compactly at favorable operability.SOLUTION: When coaxially arranging two pieces of reverse input prevention clutches ( first clutch A and second clutch B), an input shaft 2a which rotates integrally with an input member 1a of the first clutch A penetrates an input member 1b of the second clutch B and an output member 4, both the input members 1a, 1b of both the clutches A, B and the output member 4 adjoin each other in an axial direction, outer rings 7 of both the clutches A, B are fixed to a common fixed member 8, and a reverse input prevention clutch unit can be thereby made compact in size compared with the case that the two pieces of the reverse input prevention clutches having the same structures are aligned in the axial direction, and thus, favorable operability can be obtained.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reverse input prevention clutch unit in which two clutches having a reverse input prevention function are arranged side by side.

  The reverse input prevention clutch has a reverse input prevention function, that is, when input torque is applied to the input member, the rotation is transmitted to the output member, and when reverse input torque is applied to the output member, the input member rotates. It is a clutch having a function to prevent it. For example, Patent Documents 1 and 2 are provided with torque transmission means for transmitting the rotation of the input member to the output member with a slight angular delay, and means for locking the output member with respect to the reverse input torque. In this case, a lock-type reverse input prevention clutch has been proposed in which after the output member is unlocked, rotation is transmitted from the input member to the output member by torque transmitting means. Such a reverse input preventing clutch is used as a functional component having one output member for one input member.

Japanese Patent No. 4806264 JP 2013-096468 A

  By the way, in a device that performs rotation transmission from the input side to the output side in two systems, when each rotation transmission system requires a reverse input prevention function, two reverse input prevention clutches are often incorporated coaxially. At this time, if two reverse input prevention clutches having the same structure are arranged side by side in the axial direction, twice the space is required compared to the case where only one is arranged, and the axial dimension becomes considerably large. The members and the output members are alternately arranged in the axial direction, and the operability may be reduced.

  Accordingly, an object of the present invention is to provide a reverse input prevention clutch unit in which two reverse input prevention clutches can be arranged compactly and coaxially with good operability.

  In order to solve the above problems, the present invention includes an input member and an output member that rotate about the same axis, and when input torque is applied to the input member, the rotation of the input member is transmitted to the output member. In the reverse input prevention clutch unit, two clutches (reverse input prevention clutches) having a reverse input prevention function for preventing the input member from rotating when the reverse input torque is applied to the output member are arranged coaxially. In the two clutches, the shaft member rotating integrally with the input member or the output member of one clutch penetrates the input member and the output member of the other clutch, and the input members and the output members of both clutches are in the axial direction. It was set as the structure arrange | positioned so that it may adjoin. According to this structure, it becomes more compact than the case where two reverse input preventing clutches having the same structure are arranged in the axial direction, and the operability is improved by arranging two input members and two output members together.

  As the clutch, an inner ring disposed between the input member and the output member is provided inside the outer ring fixed to the fixed member by providing torque transmitting means for transmitting the rotation of the input member to the output member with a slight angular delay. Are connected to the output member so as to rotate integrally, and a plurality of cam surfaces are provided in the circumferential direction on the outer circumferential surface of the inner ring, and gradually between the inner circumferential cylindrical surface of the outer ring and each cam surface of the inner ring in the circumferential direction. A cage having narrow wedge-shaped spaces, incorporating rollers and elastic members that push the rollers into the narrow portions of the wedge-shaped spaces, and column portions inserted on both sides in the circumferential direction of the wedge-shaped spaces. It is possible to employ a lock type that is connected so as to rotate integrally with the input member.

  When both the clutches are of the above-described lock type, the outer ring of both clutches is fixed to a common fixing member, so that the number of parts can be reduced and the size can be further reduced. At this time, the fixing member may be arranged between the input members or the output members of the two clutches. And by making the said fixing member isolate | separate the inner ring | wheel of both said clutches, a roller, an elastic member, and a holder | retainer from each other, the interference of these components between both clutches can be prevented.

  Further, if the outer rings of the two clutches are integrally formed, the number of parts can be reduced to facilitate assembly.

  As described above, the reverse input prevention clutch unit of the present invention has a shaft member that rotates integrally with an input member or an output member of one clutch when the two reverse input prevention clutches are arranged coaxially. Since the input member and the output member of both clutches are adjacent to each other in the axial direction, the two reverse input prevention clutches having the same structure are arranged in the axial direction. Becomes compact and good operability is obtained.

Longitudinal front view of the reverse input prevention clutch unit of the first embodiment 1 is an exploded perspective view of FIG. Sectional view along line III-III in FIG. Sectional drawing explaining clutch operation corresponding to FIG. Vertical front view of the reverse input prevention clutch unit of the second embodiment Vertical front view of the reverse input preventing clutch unit of the third embodiment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show a first embodiment. As shown in FIG. 1, the reverse input prevention clutch unit is configured by coaxially arranging two clutches (first clutch A and second clutch B) each having a reverse input prevention function. As shown in FIGS. 1 to 3, each of the clutches A and B includes a cylindrical input member 1a or 1b and a hollow input shaft having one end fitted and fixed to the inner periphery of the input member 1a or 1b. 2a, 2b, a cage 3 that rotates integrally with the input shafts 2a, 2b, a pulley-like output member 4, and a double cylindrical output in which the outer cylindrical portion is fitted and fixed to the inner periphery of the output member 4 A shaft 5, an inner ring 6 that rotates integrally with the output shaft 5, an outer ring 7 that is disposed on the radially outer side of the inner ring 6, and a fixing member 8 to which both outer rings 7 are fixed are provided. Each cage 3 has a plurality of column portions 9 inserted between the inner ring 6 and the outer ring 7, and a plurality of rollers 10 and coils are provided between the column portions 9 adjacent in the circumferential direction. A spring (elastic member) 11 is arranged.

  The input members 1a and 1b of the clutches A and B have input gears (not shown) fitted and fixed to the outer circumferences, respectively, and torque is input through the input gears. The input shaft 2b of the second clutch B is rotatably fitted on the outer periphery of the input shaft 2a of the first clutch A in a state where the input members 1a and 1b of both clutches A and B are adjacent to each other in the axial direction. .

  Each of the input shafts 2a and 2b has an engaging portion 12 at the other end, and the engaging portion 12 is inserted into an engaging hole 13 provided in the center of the inner ring 6 so as to be coaxial with the inner ring 6. It is designed to rotate around. Here, the engagement hole 13 of the inner ring 6 has substantially the same cross-sectional shape as the outer shape of the engagement portion 12 of the input shafts 2a and 2b, but a slight gap in the rotational direction between the engagement portion 12 and the convex portion on the outer periphery. A recess is formed so as to cause (see FIG. 3). On the other hand, the output shaft 5 has a fitting portion 14 formed at one end of the inner cylindrical portion thereof fitted into the recess of the engagement hole 13 of the inner ring 6 without a gap. Thereby, the rotation of the input members 1a and 1b is transmitted to the output member 4 integrated with the inner ring 6 and the output shaft 5 with a slight angular delay. Further, a part of the engaging portion 12 of the input shafts 2a and 2b protrudes from the engaging hole 13 of the inner ring 6, and the retainer 3 is fitted into the outer periphery of the protruding portion without any gap. 2a and 2b and the input members 1a and 1b rotate together.

  The outer ring 7 is provided at one end thereof with an outward flange fixed to the fixing member 8, and at the other end, the inner ring 6, the roller 10 and the coil spring 11 together with the cage 3 are prevented from coming off in the axial direction. An orientation flange is provided.

  The fixing member 8 is a substantially disk-shaped member with two tongue-shaped portions projecting from the outer periphery, and is disposed between the output members 4 of both clutches A and B, and the input shaft 2a of both clutches A and B. 2b, the input shaft 2a of the first clutch A is rotatably supported between the engaging portions 12 of the two clutches A and B, the inner ring 6, the roller 10, the coil spring 11 and the cage 3 are separated from each other. Interference between cages 3 adjacent in the axial direction is prevented. Then, the outward flanges of the outer rings 7 of the clutches A and B are fixed to the both surfaces by a plurality of common rivets 15, and are attached to external parts by attachment holes 16 opened in the tongues. ing.

  Further, as shown in FIG. 3, a plurality of cam surfaces 17 are provided in the circumferential direction on the outer circumferential surface of the inner ring 6, and between the cam surfaces 17 and the inner circumferential cylindrical surface of the outer ring 7 on both sides in the circumferential direction. A wedge-shaped space 18 that is gradually narrowed is formed. The column portions 9 of the cage 3 are inserted on both sides in the circumferential direction of each wedge-shaped space 18, and a pair of rollers 10 pushes each roller 10 into the narrow portion of the wedge-shaped space 18 in each wedge-shaped space 18. It is arranged in a state that sandwiches.

  Since each roller 10 is pushed into the narrow portion of the wedge-shaped space 18 by the elasticity of the coil spring 11 as described above, the clutches A and B can be rotated in the rotational direction even if reverse input torque is applied to the output member 4. When the side roller 10 is engaged with the outer ring 7 fixed to the fixing member 8 and the inner ring 6 integrated with the output member 4, the output member 4 is locked, and the input shafts 2a, 2b and the input members 1a, 1b also do not rotate. .

  On the other hand, when input torque is applied to the input members 1a and 1b, as shown in FIG. 4, the column portion 9 of the cage 3 that rotates integrally with the input members 1a and 1b and the input shafts 2a and 2b By pushing the side roller 10 against the elasticity of the coil spring 11 toward the wide side of the wedge-shaped space 18, the engagement between the roller 10, the outer ring 7 and the inner ring 6 is released, and the output member 4 is released from the locked state. To be released. When the input members 1a and 1b and the input shafts 2a and 2b further rotate and the engaging portion 12 of the input shafts 2a and 2b engages with the engaging hole 13 of the inner ring 6, the input shafts 2a and 2b rotate. Is transmitted to the output shaft 5 and the output member 4 via the inner ring 6 (At this time, the roller 10 on the front side in the rotational direction moves relative to the wide part of the wedge-shaped space 18, so that the outer ring 7 and the inner ring 6 are engaged. Never match).

  This reverse input prevention clutch unit has the above-described configuration, and an input shaft (shaft member) 2a that rotates integrally with the input member 1a of the first clutch A passes through the input member 1b and the output member 4 of the second clutch B. The input members 1a, 1b and the output members 4 of both clutches A, B are adjacent to each other in the axial direction, and the outer ring 7 of both clutches A, B is fixed to a common fixing member 8, so that the same structure is provided. These two reverse input prevention clutches can be made more compact than when they are arranged in the axial direction, and good operability can be obtained.

  Further, since the fixing member 8 is arranged between the output members 4 of both clutches A and B to prevent interference between the cages 3 adjacent in the axial direction, the rotation transmission operation of each clutch A and B is also performed. It can be done smoothly.

  FIG. 5 shows a second embodiment. In this embodiment, a common outer ring 7 ′ is used instead of the outer ring 7 of both clutches A and B of the first embodiment, and the output shaft 5 of each clutch A and B and the output member 4 of the first clutch A are matched accordingly. , And the shape and position of the fixing member 8 are changed.

  That is, the outer ring 7 ′ has an axial length that faces the inner ring 6 of both clutches A and B in the radial direction, the outward flange at one end is fixed to the fixing member 8 by the rivet 15, and the inner ring at the other end The inner ring 6, the roller 10, and the coil spring 11 of the second clutch B are prevented from coming off in the axial direction by the orientation flange. Along with this, the fixing member 8 rotatably supports the output shaft 5 of the first clutch A, which has a single cylindrical shape, and the inner ring 6, the roller 10 and the coil spring 11 of the first clutch A in the axial direction. It is supposed to stop. Further, the output member 4 of the first clutch A is changed to have an inner diameter that fits on the outer periphery of the output shaft 5, and the output shaft 5 of the second clutch B has an outer cylindrical portion extended in the axial direction. ing.

  In the second embodiment, there is a possibility that the cages 3 of both clutches A and B may interfere with each other, but there is an advantage that the number of parts is smaller than that of the first embodiment and the assembly is easy.

  FIG. 6 shows a third embodiment. This embodiment has a structure in which the input side and the output side of the first embodiment are substantially interchanged.

  That is, the pulley-like output member 4 of both clutches A and B of the first embodiment is replaced with an annular input member 21, and the cylindrical input members 1a and 1b are replaced with pulley-like output members 24a and 24b. The input shafts 2 a and 2 b and the output shaft 5 of the first embodiment are used as output shafts 25 a and 25 b and an input shaft 22. And although illustration is abbreviate | omitted, the engaging part 26 of the input shaft 22 is inserted in the recessed part of the engaging hole 13 of the inner ring | wheel 6 with a slight rotation direction clearance, and the fitting part 27 of the output shafts 25a and 25b is the inner ring | wheel 6. It fits in the engagement hole 13 without a gap. Further, the same cage 3 as that of the first embodiment is arranged in the opposite direction to that of the first embodiment for connection with the input shaft 22. Other structures and functions are the same as those in the first embodiment.

  In the third embodiment, an output shaft (shaft member) 25a that rotates integrally with the output member 24a of the first clutch A passes through the input member 21 and the output member 24b of the second clutch B. Since the A and B input members 21 and the output members 24a and 24b are adjacent to each other in the axial direction and the outer ring 7 of both clutches A and B is fixed to a common fixing member 8, as in the first embodiment, Compact and easy to operate.

  Further, the fixing member 8 is disposed between the input members 21 of both clutches A and B and prevents interference between the inner rings 6 and the rollers 10 adjacent in the axial direction. Can be performed smoothly as in the first embodiment.

  In the above-described embodiments, the input shafts 2a and 22 and the output shafts 5 and 25a of the first clutch A arranged on the innermost side in the radial direction are also hollow shafts. This is because the support member that is slidably fitted into the hollow portion is fixed to another external component (not shown), thereby firmly supporting the entire reverse input prevention clutch unit and radially loading the input / output member. This is so that a smooth clutch operation can be obtained even if the operation is applied. Therefore, when the radial load does not act on the input / output member, the input shaft and the output shaft of the first clutch may be a solid shaft.

  Further, the output member is not limited to a pulley-like one as in each embodiment, and the shape thereof can be arbitrarily changed according to the application, and the means for attaching the fixing member to the external part is also adapted to the external part. It can be changed arbitrarily.

1a, 1b, 21 Input member 2a, 2b, 22 Input shaft 3 Cage 4, 24a, 24b Output member 5, 25a, 25b Output shaft 6 Inner ring 7, 7 'Outer ring 8 Fixing member 9 Column 10 Roller 11 Coil spring 12 , 26 engaging portion 13 engaging holes 14, 27 fitting portion 17 cam surface 18 wedge-shaped space A first clutch B second clutch

Claims (6)

An input member and an output member that rotate around the same axis are provided, and when input torque is applied to the input member, rotation of the input member is transmitted to the output member, and reverse input torque is applied to the output member. In the reverse input prevention clutch unit in which two clutches having a reverse input prevention function for preventing the input member from rotating when it is arranged coaxially,
In the two clutches, a shaft member that rotates integrally with an input member or an output member of one clutch passes through an input member and an output member of the other clutch, and the input members and the output members of both clutches are axially connected to each other. A reverse input prevention clutch unit, which is arranged so as to be adjacent to each other.   The clutch is provided with a torque transmission means for transmitting the rotation of the input member to the output member with a slight angular delay between the input member and the output member, and an inner ring disposed inside the outer ring fixed to the fixed member. A plurality of cam surfaces are provided in the circumferential direction on the outer peripheral surface of the inner ring so as to rotate integrally with the output member, and gradually narrow in the circumferential direction between the cylindrical surface of the outer ring and the cam surfaces of the inner ring. A wedge-shaped space is formed, and a roller and a resilient member that pushes the roller into a narrow portion of the wedge-shaped space are incorporated in each wedge-shaped space, and the cage having column portions inserted on both sides in the circumferential direction of each wedge-shaped space is input. 2. The reverse input preventing clutch unit according to claim 1, wherein the reverse input preventing clutch unit is connected to a member so as to rotate integrally.   The reverse input preventing clutch unit according to claim 2, wherein the outer ring of both clutches is fixed to a common fixing member.   The reverse input preventing clutch unit according to claim 3, wherein the fixing member is disposed between the input members or the output members of the two clutches.   5. The reverse input preventing clutch unit according to claim 4, wherein the fixing member separates the inner ring, the roller, the elastic member, and the cage of the two clutches from each other.   The reverse input preventing clutch unit according to claim 3 or 4, wherein outer rings of the two clutches are integrally formed.

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