JP2019173912A - Clutch unit - Google Patents

Abstract

To secure concentricity of an output shaft and an outer ring by preventing misalignment of an outer ring to the output shaft and to improve braking performance and operation feeling.SOLUTION: A clutch unit 10 which includes a lever-side clutch portion 11 controlling transmission and blockage of input rotational torque and a brake-side clutch portion 12 transmitting the rotational torque from the lever-side clutch portion 11 to the output side and blocking the rotational torque inversely input from the output side. The brake-side clutch portion 12 includes a side plate 25 and an outer ring 23 restricted in rotation, an output shaft 22 to which the rotation is output, and a plurality of cylindrical rollers 27 controlling blockage and transmission of the rotational torque. The output shaft 22 is rotatably mounted on the side plate 25, and the cylindrical roller 27 is disposed between the output shaft 22 and the outer ring 23. A step portion 25c is formed on the side plate 25 for centering the outer ring 23 to the output shaft 22.SELECTED DRAWING: Figure 1

Description

  The present invention includes an input-side clutch portion to which rotational torque is input, and an output-side clutch portion that transmits the rotational torque from the input-side clutch portion to the output side and blocks the rotational torque from the output side. It relates to the clutch unit.

  In a clutch unit using an engagement element such as a cylindrical roller or a ball, a clutch portion is disposed between an input member and an output member. The clutch portion is configured to control transmission and interruption of rotational torque by engaging and disengaging an engagement member between the input member and the output member.

  The present applicant has previously proposed a clutch unit incorporated in an automobile seat lifter that adjusts the seat seat up and down by lever operation (see, for example, Patent Document 1).

  The clutch unit disclosed in Patent Document 1 transmits a rotational torque from the lever side clutch portion to which the rotational torque is input by lever operation, and the rotational torque from the lever side clutch portion to the output side, and the rotational torque from the output side. And a brake-side clutch section for blocking.

  The lever side clutch part is separated from the outer ring by engaging and disengaging the outer ring to which rotational torque is input by lever operation, the inner ring that transmits the rotational torque from the outer ring to the brake side clutch part, and the wedge clearance between the outer ring and the inner ring. The main part is composed of cylindrical rollers that control transmission and interruption of the rotational torque.

  The brake-side clutch section includes an inner ring to which rotational torque from the lever-side clutch section is input, an output shaft from which rotational torque is output from the inner ring, side plates and outer rings that are restricted in rotation, and between the output shaft and the outer ring. The main parts are a plurality of cylindrical rollers that control the interruption of the rotational torque from the output shaft and the transmission of the rotational torque from the inner ring by engagement and disengagement to the wedge clearance, and a friction ring that provides rotational resistance to the output shaft. Is configured.

  In the lever side clutch portion, when rotational torque is input to the outer ring by lever operation, the cylindrical roller engages with the wedge clearance between the outer ring and the inner ring. Due to the engagement of the cylindrical rollers up to the wedge clearance, rotational torque is transmitted to the inner ring, and the inner ring rotates.

  In the brake side clutch portion, when rotational torque is reversely input to the output shaft by sitting on the seat, the cylindrical roller engages with the wedge clearance between the output shaft and the outer ring, and the output shaft is locked to the outer ring. . Due to the locking of the output shaft, the rotational torque reversely input from the output shaft is cut off. Thereby, the seat surface height of the seat is maintained.

  On the other hand, when rotational torque is input from the lever side clutch portion to the brake side clutch portion, the inner ring presses the cylindrical roller, so that the cylindrical roller separates from the wedge clearance between the output shaft and the outer ring. When the cylindrical roller is detached from the wedge clearance, the locked state of the output shaft is released and the output shaft can be rotated. When the locked state is released, rotational resistance is applied to the output shaft by the friction ring.

  When the inner ring further rotates, the rotational torque from the inner ring is transmitted to the output shaft, and the output shaft rotates. By the rotation of the output shaft, the seat surface height of the seat can be adjusted.

JP 2011-169402 A

  By the way, the brake side clutch part of the clutch unit disclosed in Patent Document 1 is mainly composed of an inner ring, an output shaft, a side plate, an outer ring, a cylindrical roller, and a friction ring.

  Depending on the dimensional accuracy and positional relationship of these major components, the brake performance in the brake side clutch part or the operation feeling in lever operation is affected.

  Here, the brake-side clutch portion has a structure in which the output shaft is rotatably attached to the side plate via the friction ring by press-fitting a friction ring attached to the side plate into the output shaft. By adopting such a structure, it is easy to ensure the coaxiality between the output shaft and the side plate.

  On the other hand, for the side plate and outer ring constituting the brake side clutch portion, a notch recess is formed in the outer peripheral edge portion of the outer ring and a claw portion is formed in the outer peripheral edge portion of the side plate, and the claw portion of the side plate is formed in the notch recess of the outer ring. By fitting and caulking, the outer ring and the side plate are integrated with the caulking portion (see FIG. 21 of Patent Document 1).

  In this structure, it is difficult to increase the manufacturing accuracy of the caulking portion that integrates the side plate and the outer ring. Therefore, a certain amount of play is set between the side plate and the outer ring so that the side plate and the outer ring can be easily assembled.

  In this way, when there is a certain amount of play, the outer ring may be misaligned with respect to the output shaft when the claw portion of the side plate is fitted into the notch recess of the outer ring and caulked. It is difficult to ensure the same degree of coaxiality.

  When such misalignment occurs, a plurality of cylindrical rollers are disposed between the output shaft and the outer ring, so that it becomes difficult for the plurality of cylindrical rollers to receive a load evenly over the entire circumference. As a result, the brake performance in the brake side clutch part is lowered and the operation feeling in lever operation is deteriorated.

  Therefore, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to avoid the misalignment of the outer ring with respect to the output shaft, to ensure the coaxiality between the output shaft and the outer ring, and to improve the braking performance and An object of the present invention is to provide a clutch unit capable of improving the operational feeling.

  The clutch unit according to the present invention transmits an input-side clutch portion that controls transmission and cutoff of input rotational torque, and transmits rotational torque from the input-side clutch portion to the output side, and is reversely input from the output side. The basic structure which consists of an output side clutch part which interrupts | blocks rotational torque is comprised.

  The output-side clutch unit of the present invention includes a side plate and an outer ring whose rotation is restricted, an output shaft from which rotation is output, and a plurality of engagement elements that control interruption and transmission of rotational torque, and the output shaft is provided on the side plate. It is rotatably mounted and has a structure in which an engagement element is disposed between the output shaft and the outer ring.

  As a technical means for achieving the above-mentioned object, the present invention is characterized in that a position restricting portion for centering the outer ring with respect to the output shaft is provided between the output shaft and the outer ring.

  In the present invention, the outer ring is centered with respect to the output shaft by the position restricting portion provided between the output shaft and the outer ring. As a result, when the side plate is caulked to the outer ring with a certain amount of play between the side plate to which the output shaft is attached and the outer ring, the misalignment between the side plate and the outer ring, that is, the misalignment of the outer ring with respect to the output shaft is eliminated. It can be avoided.

  By centering the outer ring with respect to the output shaft by the position restricting portion, it is possible to ensure the coaxiality between the output shaft and the outer ring. As a result, the plurality of engagement elements arranged between the output shaft and the outer ring can receive the load evenly over the entire circumference.

  The position restricting portion in the present invention is preferably composed of a step portion formed on at least one of the side plate and the outer ring. Here, the stepped portion may be formed only on either the side plate or the outer ring, or may be formed on both the side plate and the outer ring.

  By adopting such a structure, the position restricting portion can be realized with a simple structure called a stepped portion.

  The position restricting portion in the present invention is preferably configured by a washer interposed between the output shaft and the outer ring.

  By adopting such a structure, the position restricting portion can be realized with a simple structure called a washer.

  The output side clutch part in the present invention includes an inner ring to which rotational torque from the input side clutch part is input, and a cover whose rotation is restricted together with the side plate and the outer ring, and the outer ring is located between the inner ring and the outer ring with respect to the inner ring. A structure provided with a position restricting portion for centering is desirable.

  In this structure, the outer ring and the inner ring are centered by the position restricting portion provided between the outer ring and the inner ring. This avoids misalignment between the side plate, the outer ring and the cover when the side plate is crimped to the outer ring and the cover with a certain amount of play between the side plate and the outer ring and the cover. It is possible to prevent the operation feeling from deteriorating.

  The position restricting portion in the present invention is preferably configured by a step portion formed on at least one of the outer ring and the cover. Here, the step portion may be formed only on either the outer ring or the cover, or may be formed on both the outer ring and the cover.

  By adopting such a structure, the position restricting portion can be realized with a simple structure called a stepped portion.

  The input side clutch part and the output side clutch part in the present invention desirably have a structure incorporated in an automobile seat lifter part.

  If such a structure is adopted, the brake function and lever operation in the brake side clutch part can be achieved in the vehicle seat lifter part by using the input side clutch part as the lever side clutch part and the output side clutch part as the brake side clutch part. The operational feeling can be improved.

  According to the present invention, when the side plate is caulked to the outer ring with a certain amount of play between the side plate to which the output shaft is attached and the outer ring, misalignment between the side plate and the outer ring, that is, the outer ring relative to the output shaft is Misalignment can be avoided.

  By centering the outer ring with respect to the output shaft, the coaxiality between the output shaft and the outer ring can be ensured. As a result, the plurality of engagement elements arranged between the output shaft and the outer ring can receive the load evenly over the entire circumference.

  When this clutch unit is incorporated in an automobile seat lifter, it is possible to improve the brake performance in the brake-side clutch and the operational feeling in lever operation, thereby realizing a high-performance and highly reliable clutch unit.

In embodiment of this invention, it is sectional drawing which shows the whole structure of a clutch unit. It is sectional drawing which follows the PP line | wire of FIG. It is sectional drawing which follows the QQ line of FIG. It is an assembly exploded perspective view which shows the side plate of FIG. 1, an outer ring | wheel, and a cover. FIG. 2 is an exploded perspective view showing a side plate, a friction ring, and an output shaft of FIG. 1. It is a block diagram which shows the seat seat and seat lifter part of a motor vehicle. It is a principal part expanded sectional view of FIG. In other embodiment of this invention, it is a fragmentary sectional view which shows the whole structure of a clutch unit. In other embodiment of this invention, it is a fragmentary sectional view which shows the whole structure of a clutch unit. In other embodiment of this invention, it is a fragmentary sectional view which shows the whole structure of a clutch unit.

  An embodiment of a clutch unit according to the present invention will be described in detail with reference to the drawings. In the following embodiments, a clutch unit incorporated in an automobile seat lifter is illustrated, but the present invention can be applied to other than the automobile seat lifter.

  1 is a cross-sectional view showing the overall configuration of the clutch unit, FIG. 2 is a cross-sectional view taken along line P-P in FIG. 1, and FIG. 3 is a cross-sectional view taken along line Q-Q in FIG. Before describing the characteristic configuration of this embodiment, the overall configuration of the clutch unit will be described.

  As shown in FIG. 1, the clutch unit 10 of this embodiment has a structure in which a lever side clutch portion 11 as an input side clutch portion and a brake side clutch portion 12 as an output side clutch portion are unitized.

  The lever side clutch part 11 controls transmission and interruption of rotational torque input by lever operation. The brake-side clutch unit 12 has a reverse input blocking function for transmitting the rotational torque from the lever-side clutch unit 11 to the output side and blocking the rotational torque that is reversely input from the output side.

  As shown in FIGS. 1 and 2, the lever side clutch portion 11 includes a side plate 13, an outer ring 14, an inner ring 15, a plurality of cylindrical rollers 16, a cage 17, an inner centering spring 18, and an outer centering spring. 19 is the main part.

  The side plate 13 and the outer ring 14 are swaged by fitting a claw portion 13a extending from the outer peripheral edge portion of the side plate 13 toward the brake side clutch portion 12 into a notch recess 14a formed in the outer peripheral edge portion of the outer ring 14. Is integrated. The input of rotational torque to the side plate 13 and the outer ring 14 is performed by an operation lever 43 (see FIG. 6) attached to the side plate 13.

  The inner ring 15 includes a cylindrical portion 15a through which the output shaft 22 is inserted, a diameter-enlarged portion 15b in which a brake side end portion of the cylindrical portion 15a extends radially outward, and an outer peripheral end portion of the diameter-enlarged portion 15b. It consists of a plurality of column portions 15c (see FIG. 3) that protrude by bending toward the brake side. The inner ring 15 transmits the rotational torque input from the outer ring 14 to the brake side clutch unit 12.

  On the inner periphery of the outer ring 14, a plurality of cam surfaces 14b are formed at equal intervals in the circumferential direction. A wedge clearance 20 is formed between the cam surface 14 b and the cylindrical outer peripheral surface 15 d of the cylindrical portion 15 a of the inner ring 15.

  The cylindrical roller 16 is disposed between the outer ring 14 and the inner ring 15. The cylindrical roller 16 controls transmission and interruption of rotational torque from the outer ring 14 by engagement and disengagement at a wedge clearance 20 formed between the cam surface 14b of the outer ring 14 and the outer peripheral surface 15d of the inner ring 15.

  In the cage 17, pockets 17a for accommodating the cylindrical rollers 16 are formed at a plurality of positions in the circumferential direction at equal intervals. The retainer 17 holds the plurality of cylindrical rollers 16 at equal intervals in the circumferential direction in the wedge clearance 20 between the cam surface 14b of the outer ring 14 and the outer peripheral surface 15d of the inner ring 15.

  The inner centering spring 18 is a C-shaped elastic member having a circular cross section disposed between the cage 17 and the cover 24 of the brake side clutch portion 12, and both ends thereof are part of the cage 17 and the cover 24. Is locked.

  When rotational torque is input from the outer ring 14 by lever operation, the inner centering spring 18 expands in diameter with the rotation of the cage 17 that follows the outer ring 14 with respect to the cover 24 in a stationary state, and elastic force is exerted. Accumulated. When no rotational torque is input from the outer ring 14, the cage 17 returns to the neutral state by the elastic force of the inner centering spring 18.

  The outer centering spring 19 located on the radially outer side of the inner centering spring 18 is a C-shaped strip elastic member disposed between the outer ring 14 and the cover 24 of the brake-side clutch portion 12. The outer ring 14 and the cover 24 are partly locked.

  When rotational torque is input from the outer ring 14 by lever operation, the outer centering spring 19 expands in diameter with the rotation of the outer ring 14 and accumulates elastic force with respect to the cover 24 in a stationary state. When no rotational torque is input from the outer ring 14, the outer ring 14 returns to the neutral state by the elastic force of the outer centering spring 19.

  As shown in FIGS. 1 and 3, the brake side clutch portion 12 includes a column portion 15c of the inner ring 15 extending from the lever side clutch portion 11, an output shaft 22, an outer ring 23 as a stationary system, a cover 24, and side plates 25. A plurality of pairs of cylindrical rollers 27 that are engaging elements, a leaf spring 28 having an N-shaped cross section, and a friction ring 29 constitute a main part.

  The output shaft 22 includes a shaft portion 22a in which the cylindrical portion 15a of the inner ring 15 is extrapolated, a large diameter portion 22b integrally formed at a substantially central portion of the shaft portion 22a, and an output side end of the shaft portion 22a. And a pinion gear portion 22d formed coaxially with the portion. Rotational torque from the lever side clutch portion 11 is output to the output shaft 22.

  The pinion gear portion 22d of the output shaft 22 is connected to the seat lifter portion 39 (see FIG. 6). Further, the washer 31 is press-fitted into the input side end portion of the shaft portion 22a of the output shaft 22 via the wave washer 30, thereby preventing the component parts of the lever side clutch portion 11 from coming off.

  On the outer periphery of the large diameter portion 22b of the output shaft 22, a plurality (six in the figure) of flat cam surfaces 22e are formed at equal intervals in the circumferential direction. A wedge clearance 26 is formed between the cam surface 22e of the large diameter portion 22b and the cylindrical inner peripheral surface 23a of the outer ring 23.

  In the wedge clearance 26, two cylindrical rollers 27 and one leaf spring 28 interposed therebetween are arranged. The cylindrical roller 27 controls the interruption of the rotational torque reversely input from the output shaft 22 and the transmission of the rotational torque input from the inner ring 15 by engagement and disengagement at the wedge clearance 26. The leaf spring 28 biases the separation force in the circumferential direction between the cylindrical rollers 27.

  A plurality of pairs (six pairs in the figure) of the cylindrical rollers 27 and the leaf springs 28 are arranged at equal intervals in the circumferential direction by the column portions 15 c of the inner ring 15. The pillar portion 15c of the inner ring 15 has a function of transmitting rotational torque input from the outer ring 14 to the output shaft 22, and a function of accommodating the cylindrical rollers 27 and the leaf springs 28 in the pocket 15f and holding them at equal intervals in the circumferential direction. have.

  Further, the large diameter portion 22b is provided with a protrusion 22f for transmitting the rotational torque from the inner ring 15 to the output shaft 22. The protrusion 22f is inserted and disposed in a hole 15e formed in the enlarged diameter portion 15b of the inner ring 15 with a circumferential clearance.

  Notch recesses 23b and 24a are formed in the outer peripheral edge portions of the outer ring 23 and the cover 24, and claw portions 25a are formed in the outer peripheral edge portion of the side plate 25 (see FIG. 4). The outer ring 23, the cover 24, and the side plate 25 are integrated by fitting the claw portions 25 a of the side plate 25 into the notched recesses 23 b and 24 a of the outer ring 23 and the cover 24 and caulking them.

  The friction ring 29 is, for example, a resin member, and is fixed to the side plate 25 by fitting a plurality (eight in the figure) of protrusions 29b into the holes 25b of the side plate 25 (see FIG. 5). The friction ring 29 is press-fitted with a fitting margin into an inner peripheral surface 22g of an annular recess 22c formed in the large-diameter portion 22b of the output shaft 22.

  The frictional force generated between the outer peripheral surface 29a of the friction ring 29 and the inner peripheral surface 22g of the annular recess 22c of the output shaft 22 slides on the friction ring 29 fixed to the stationary side plate 25 when the lever is operated. Rotational resistance (sliding torque) is applied to the output shaft 22 that performs.

  An operation example of the lever side clutch part 11 and the brake side clutch part 12 having the above-described structure will be described below.

  In the lever side clutch portion 11, when rotational torque is input to the outer ring 14 by lever operation, the cylindrical roller 16 engages with the wedge clearance 20 between the outer ring 14 and the inner ring 15. Due to the engagement of the cylindrical roller 16 in the wedge clearance 20, rotational torque is transmitted to the inner ring 15 and the inner ring 15 rotates. At this time, elastic force is accumulated in the centering springs 18 and 19 with the rotation of the outer ring 14 and the cage 17.

  When there is no input of rotational torque by lever operation, the cage 17 and the outer ring 14 are returned to the neutral state by the elastic force of the centering springs 18 and 19. On the other hand, the inner ring 15 maintains the given rotational position as it is. Therefore, the inner ring 15 rotates in a jog by repeating the rotation of the outer ring 14 by the pumping operation of the operation lever 43 (see FIG. 6).

  In the brake-side clutch portion 12, the cylindrical roller 27 engages with the wedge clearance 26 between the output shaft 22 and the outer ring 23 even when the rotational torque is reversely input to the output shaft 22 by sitting on the seat 40 (see FIG. 6). Thus, the output shaft 22 is locked with respect to the outer ring 23.

  In this way, the rotational torque reversely input from the output shaft 22 is locked by the brake side clutch portion 12 and the return of the rotational torque reversely input to the lever side clutch portion 11 is blocked. Thereby, the seat surface height of the seat 40 is maintained.

  On the other hand, when the rotational torque from the lever side clutch portion 11 is input to the inner ring 15 by lever operation, the column portion 15 c of the inner ring 15 comes into contact with the cylindrical roller 27 and resists the elastic force of the leaf spring 28. Press.

  As a result, the cylindrical roller 27 is detached from the wedge clearance 26. By the separation of the cylindrical roller 27 from the wedge clearance 26, the output shaft 22 is unlocked and the output shaft 22 becomes rotatable. When the locked state of the output shaft 22 is released, rotational friction is applied to the output shaft 22 by the friction ring 29.

  When the inner ring 15 further rotates, the clearance between the hole 15e of the enlarged diameter portion 15b of the inner ring 15 and the projection 22f of the large diameter portion 22b of the output shaft 22 is clogged, and the enlarged diameter portion 15b of the inner ring 15 becomes a projection of the output shaft 22. It contacts 22f in the rotational direction.

  Thereby, the rotational torque from the lever side clutch part 11 is transmitted to the output shaft 22 via the protrusion 22f, and the output shaft 22 rotates. That is, when the inner ring 15 is jogged and rotated, the output shaft 22 is also jogged and rotated. Thereby, the seat surface height of the seat 40 can be adjusted.

  The clutch unit 10 described above is used by being incorporated in an automobile seat lifter 39 that adjusts the seating surface height of the seat 40 by lever operation. FIG. 6 shows a seat seat 40 installed in a passenger compartment of an automobile.

  As shown in FIG. 6, the seat surface height of the seat 40 in the seat lifter 39 is adjusted by the operation lever 43 attached to the side plate 13 (see FIG. 1) of the lever side clutch portion 11 in the clutch unit 10. The sheet lifter unit 39 has the following structure.

  One end of each of the link members 45 and 46 is pivotally attached to the slide movable member 44 so as to be rotatable. The other ends of the link members 45 and 46 are pivotally attached to the seat seat 40. A sector gear 47 is integrally provided at the other end of the link member 45. The sector gear 47 meshes with the pinion gear portion 22 d of the output shaft 22 of the clutch unit 10.

  For example, when lowering the seating surface of the seat 40, the lever operation at the lever side clutch unit 11, that is, the operation lever 43 of the seat lifter unit 39 is swung downward to cause the brake side clutch unit 12 (FIG. 1). Release the lock state of (see).

  When the brake side clutch portion 12 is unlocked, the friction surface 29 (see FIG. 1) applies an appropriate rotational resistance (sliding torque) to the output shaft 22 so that the seat surface of the seat 40 is smoothly lowered. can do.

  By releasing the lock at the brake side clutch part 12, the pinion gear part 22d of the output shaft 22 of the brake side clutch part 12 is rotated clockwise by the rotational torque transmitted from the lever side clutch part 11 to the brake side clutch part 12 (FIG. 6). (In the direction of the arrow).

  Then, the sector gear 47 meshing with the pinion gear portion 22d swings counterclockwise (in the direction of the arrow in FIG. 6), and both the link member 45 and the link member 46 are tilted to lower the seat surface of the seat 40.

  After the seat surface height of the seat 40 is adjusted in this way, when the operation lever 43 is released, the operation lever 43 swings upward by the elastic force of the centering springs 18 and 19 to return to the original position (neutral). Return to the state.

  When the operation lever 43 is swung upward, the seat surface of the seat 40 is raised by the reverse operation to that described above. When the operation lever 43 is released after adjusting the seat surface height of the seat 40, the operation lever 43 swings downward and returns to the original position (neutral state).

  The overall configuration of the clutch unit 10 in this embodiment is as described above, but the side plate 25, the outer ring 23, and the cover 24 of the brake side clutch portion 12 that are characteristic configurations thereof will be described in detail below.

  The brake side clutch portion 12 of the clutch unit 10 in this embodiment has a structure in which the side plate 25, the outer ring 23, and the cover 24 are integrated as a stationary system.

  Here, the output shaft 22 is rotatably attached to the side plate 25 via a friction ring 29 (see FIG. 5). The friction ring 29 is fixed to the side plate 25 by fitting a protrusion 29b protruding toward the side plate 25 into the hole 25b of the side plate 25, and is press-fitted with a fitting allowance into the annular recess 22c of the output shaft 22. Thereby, the coaxiality of the output shaft 22 and the side plate 25 is easily ensured.

  On the other hand, with respect to the side plate 24, the outer ring 23, and the cover 24 that constitute the brake side clutch portion 12, notched recesses 23 b and 24 a are formed in the outer peripheral edge portions of the outer ring 23 and the cover 24, A portion 25a is formed.

  In this structure, the outer ring 23, the cover 24, and the side plate 25 are integrated by fitting the claw portions 25a of the side plate 25 into the cutout recesses 23b, 24a of the outer ring 23 and the cover 24 and caulking (FIG. 4). reference).

  The caulking portion that integrates the side plate 25, the outer ring 23, and the cover 24 is difficult to increase in manufacturing accuracy. Therefore, a certain amount of play is set between the side plate 25, the outer ring 23 and the cover 24 so that the side plate 25, the outer ring 23 and the cover 24 can be easily assembled.

  Thus, when there is a certain amount of play, the outer ring 23 is misaligned with the output shaft 22 when the claw portions 25a of the side plate 25 are fitted into the cutout recesses 23b, 24a of the outer ring 23 and the cover 24 and tightened. May occur.

  In order to avoid misalignment of the outer ring 23 with respect to the output shaft 22, the brake side clutch portion 12 of the clutch unit 10 in this embodiment places the outer ring 23 with respect to the output shaft 22 between the output shaft 22 and the outer ring 23. It has a structure provided with a position restricting portion for centering.

  As shown in FIG. 7, the specific structure of the position restricting portion is constituted by a step portion 25 c formed on a surface facing the outer ring 23 at the outer peripheral edge portion of the side plate 25. The position restricting portion is realized by such a simple structure of the step portion 25c.

  In this embodiment, the step portion 25 c is provided on the side plate 25, but a step portion may be provided on the outer ring 23. Further, a step portion may be provided on both the side plate 25 and the outer ring 23. In addition, the radial position where the step portion is provided is arbitrary.

  Thus, by engaging the outer ring 23 with the step portion 25 c of the side plate 25, there is a certain amount of play between the side plate 25 and the outer ring 23 to which the output shaft 22 is attached via the friction ring 29. When caulking the side plate 25 to the outer ring 23, misalignment between the side plate 25 and the outer ring 23, that is, misalignment of the outer ring 23 with respect to the output shaft 22 can be avoided.

  By centering the outer ring 23 with respect to the output shaft 22 through the step portion 25c of the side plate 25, the coaxiality between the output shaft 22 attached to the side plate 25 and the outer ring 23 integrated with the side plate 25 can be increased. Can be secured. As a result, the plurality of cylindrical rollers 27 disposed between the output shaft 22 and the outer ring 23 can receive a load evenly over the entire circumference.

  That is, in the brake-side clutch portion 12, the plurality of cylindrical rollers 27 engaged with the wedge clearance 26 between the output shaft 22 and the outer ring 23 are evenly loaded over the entire circumference by the rotational torque reversely input from the output shaft 22. Therefore, the brake performance in the brake side clutch portion 12 can be improved.

  In addition, the cylindrical roller 27 pressed against the elastic force of the leaf spring 28 is brought into contact with the column portion 15c of the inner ring 15 by the rotational torque input to the inner ring 15 from the lever side clutch portion 11 over the entire circumference. Since the load can be received evenly, the operational feeling in lever operation can be improved.

  In the above embodiment, as the position restricting portion, the step portion 25 c of the side plate 25 is engaged with the outer ring 23, thereby centering the side plate 25 and the outer ring 23, that is, centering the outer ring 23 with respect to the output shaft 22. Although the structure to illustrate was illustrated, the position control part shown in FIG. 8 other than this may be sufficient.

  As shown in FIG. 8, the position restricting portion includes a washer 32 interposed between the output shaft 22 and the outer ring 23. The position restricting portion is realized by such a simple structure called the washer 32. In FIG. 8, the same parts as those in FIG.

  Thus, when the washer 32 is interposed between the output shaft 22 and the outer ring 23, when the side plate 25 is caulked to the outer ring 23 with a certain amount of play between the side plate 25 and the outer ring 23, Misalignment of the outer ring 23 with respect to the output shaft 22 can be avoided.

  By directly centering the outer ring 23 with respect to the output shaft 22 with the washer 32, the plurality of cylindrical rollers 27 disposed between the output shaft 22 and the outer ring 23 are evenly loaded over the entire circumference. Can receive. As a result, it is possible to improve the brake performance in the brake side clutch portion 12 and the operational feeling in lever operation.

  In the above embodiment, the structure in which the side plate 25 and the outer ring 23 are centered as the position restricting portion is illustrated, but the structure in which the inner ring 15 and the outer ring 23 are centered through the cover 24 as another position restricting portion. Is also effective. The embodiment shown in FIGS. 9 and 10 exemplifies a structure in which a position restricting portion for centering the outer ring 23 with respect to the inner ring 15 is provided between the inner ring 15 and the outer ring 23.

  As shown in FIG. 9, the specific structure of the position restricting portion includes a stepped portion 24 b formed on a surface facing the outer ring 23 at the outer peripheral edge of the cover 24. The position restricting portion is realized by such a simple structure of the step portion 24b. In FIG. 9, the same parts as those in FIG.

  Thus, by engaging the outer ring 23 with the stepped portion 24 b of the cover 24, a certain amount of play is generated between the side plate 25 to which the output shaft 22 is attached via the friction ring 29, the outer ring 23 and the cover 24. When the side plate 25 is crimped to the outer ring 23 and the cover 24 in a certain state, misalignment between the outer ring 23 and the cover 24 can be avoided.

  As described above, the outer ring 23 and the cover 24 are centered with the stepped portion 24b of the cover 24, so that the enlarged diameter portion 15b of the inner ring 15 that slides with respect to the cover 24 does not come into contact with the inner ring. Fifteen column portions 15c can hold the cylindrical rollers 27 appropriately.

  Accordingly, the plurality of cylindrical rollers 27 disposed between the output shaft 22 and the outer ring 23 can receive a load evenly over the entire circumference. As a result, it is possible to improve the brake performance in the brake side clutch portion 12 and the operational feeling in lever operation.

  In this embodiment, the step 24b is formed on the outer peripheral edge of the cover 24 by bending, and the outer peripheral edge of the outer ring 23 is held. 7) may be provided with a stepped portion.

  In this embodiment, the step 24 b is provided on the cover 24, but a step may be provided on the outer ring 23. Furthermore, as shown in FIG. 10, step portions 24 c and 23 c may be provided on both the cover 24 and the outer ring 23. In addition, the radial position where the step portion is provided is arbitrary. In FIG. 10, the same parts as those in FIG.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

10 Clutch unit 11 Input side clutch (lever side clutch)
12 Output side clutch (brake side clutch)
22 output shaft 23 outer ring 24 cover 25 side plate 27 engagement element (cylindrical roller)
23c, 24b, 24c, 25c Position restriction part (step part)
32 Position restriction part (washer)
39 Seat lifter

Claims (6)

An input side clutch unit that controls transmission and cutoff of input rotational torque, and an output side clutch that transmits rotational torque from the input side clutch unit to the output side and blocks rotational torque that is reversely input from the output side And consists of
The output-side clutch unit includes a side plate and an outer ring whose rotation is constrained, an output shaft from which rotation is output, and a plurality of engagement elements that control interruption and transmission of rotational torque, and the output shaft is connected to the side plate. A clutch unit that is rotatably mounted and has the engagement element disposed between the output shaft and the outer ring,
A clutch unit comprising a position restricting portion for centering the outer ring with respect to the output shaft between the output shaft and the outer ring.   The clutch unit according to claim 1, wherein the position restricting portion includes a step portion formed on at least one of the side plate and the outer ring.   The clutch unit according to claim 1, wherein the position restricting portion includes a washer interposed between the output shaft and the outer ring. An input side clutch unit that controls transmission and cutoff of input rotational torque, and an output side clutch that transmits rotational torque from the input side clutch unit to the output side and blocks rotational torque that is reversely input from the output side And consists of
The output-side clutch unit includes an inner ring to which rotational torque from the input-side clutch unit is input, a side plate and an outer ring that are restricted in rotation, and an output shaft that is rotatably attached to the side plate and outputs rotation. A clutch unit comprising a plurality of engagement elements for controlling the interruption and transmission of rotational torque, and a cover whose rotation is restricted together with the outer ring, wherein the engagement elements are disposed between the output shaft and the outer ring. And
A clutch unit comprising a position restricting portion for centering the outer ring with respect to the inner ring between the inner ring and the outer ring.   The clutch unit according to claim 4, wherein the position restricting portion includes a step portion formed on at least one of the outer ring and the cover.   The clutch unit according to claim 1 or 4, wherein the input side clutch part and the output side clutch part are incorporated in an automobile seat lifter part.

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