JP2017223322A - Clutch unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely lock an output shaft and to prevent intrusion of a foreign substance from the outside even if a radial load is applied to the output shaft.SOLUTION: A clutch unit comprises: a lever-side clutch section 11 at an input side for controlling transmission and cutoff of rotation torque inputted by a lever operation; and a brake-side clutch section 12 at an output side for transmitting rotation torque inputted from the lever-side clutch section 11 and cutting off rotation torque reversely inputted from the output side. The brake-side clutch section 12 includes: an output shaft 22 from which rotation torque is outputted; and an outer ring 23 of which the rotation is restricted. A cover 32 enclosing the lever-side clutch section 11 and the brake-side clutch section 12 is attached to the outer ring 23, an opening hole 32d regulating tilting of the output shaft 22 relative to an axial line is provided in the cover 32, and an outer peripheral surface 31a of a washer 31 attached to the output shaft 22 is abutted to an inner peripheral surface 32f of the opening hole 32d of the cover 32.SELECTED DRAWING: Figure 1

Description

  The present invention includes a lever-side clutch portion to which rotational torque is input by lever operation, a brake-side clutch portion that transmits rotational torque from the lever-side clutch portion to the output side, and interrupts rotational torque from the output side. It is related with the clutch unit provided with.

  In general, 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 engaging member such as a cylindrical roller or a ball 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 lever side clutch portion to which rotational torque is input by lever operation and a rotational torque input from the lever side clutch portion to the output side, and reverses from the output side. And a brake-side clutch portion that cuts off the input rotational torque.

  The lever side clutch part is engaged with the outer ring to which rotational torque is input by lever operation, the inner ring that transmits the rotational torque input from the outer ring to the brake side clutch part, and the wedge clearance between the outer ring and the inner ring. In addition, the cylindrical roller that controls the transmission and interruption of the rotational torque from the outer ring by separating and the elastic torque is accumulated by the rotational torque input from the outer ring, and when the rotational torque is no longer input, the outer ring is neutralized by the accumulated elastic force. The main part is comprised with the centering spring which returns to a state.

  The brake-side clutch unit is configured to cut off the rotational torque from the output shaft by engaging and disengaging the outer ring whose rotation is restricted, the output shaft from which the rotational torque is output, and the wedge ring between the outer ring and the output shaft. The main part is composed of a cylindrical roller and a leaf spring that control transmission of rotational torque from the lever side clutch portion, and a cage that holds the cylindrical roller and the leaf spring at equal intervals in the circumferential direction. Note that the retainer of the brake side clutch portion is formed integrally with the inner ring of the lever side clutch portion.

  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. At this time, an elastic force is accumulated in the centering spring as the outer ring rotates.

  When there is no input of rotational torque by lever operation, the outer ring returns to the neutral state by the elastic force of the centering spring, while the inner ring maintains the given rotational position. Therefore, the inner ring rotates in a jog by repeating the rotation of the outer ring, that is, by the pumping operation of the operation lever.

  In the brake-side clutch, when rotational torque is reversely input to the output shaft due to seating on the seat, the cylindrical roller engages with the wedge clearance between the output shaft and the outer ring, and the output shaft locks against the outer ring. Is done. The rotation torque from the output shaft is cut off by the lock of the output shaft. Thereby, the height of the seat is maintained.

  On the other hand, when rotational torque is input from the inner ring of the lever side clutch part to the cage of the brake side clutch part, the cage rotates and contacts the cylindrical roller to press the cylindrical roller against the elastic force of the leaf spring. Thus, the cylindrical roller is detached from the wedge clearance between the outer ring and the output shaft. With the separation of the cylindrical roller, the locked state of the output shaft is released, and the output shaft can be rotated.

  Then, when the cage of the brake side clutch portion further rotates, the rotational torque from the cage is transmitted to the output shaft, and the output shaft rotates. In other words, when the cage is joggingly rotated, the output shaft is also joggingly rotated. By the jogging rotation of the output shaft, the seat seat can be adjusted up and down.

Japanese Patent No. 5207777

  By the way, the conventional clutch unit disclosed in Patent Document 1 includes a structure in which an output shaft of a brake-side clutch portion is connected to a seat lifter portion that vertically adjusts a seat seat of an automobile.

  In this brake side clutch portion, as described above, when the rotational torque is reversely input to the output shaft by seating 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 against the outer ring.

  When reverse rotation torque is input to the output shaft, a radial load is generated at the connecting portion between the output shaft and the seat lifter portion. When such a radial load is applied to the output shaft, the output shaft is inclined with respect to the axis of the stationary outer ring.

  As described above, when the output shaft is tilted, the contact surface of the output shaft with the cylindrical roller is tilted, and a skew occurs in which the cylindrical roller slides with respect to the contact surface and the posture of the cylindrical roller changes. When such a cylindrical roller skew occurs, the cylindrical roller separates from the wedge clearance when the rotational torque is reversely input, making it difficult to securely lock the output shaft.

  Moreover, the components of the clutch unit including the lever side clutch portion and the like are exposed. For this reason, foreign matter such as dust may enter the lever-side clutch portion or the like from the outside of the clutch unit, and the function of the lever-side clutch portion or the like may be impaired due to the entry of the foreign matter.

  Therefore, the present invention has been proposed in view of the above-described improvements, and the object of the present invention is to securely lock the output shaft even when a radial load is applied to the output shaft and to intrude foreign matter from the outside. It is an object of the present invention to provide a clutch unit that can prevent the above.

  The clutch unit of the present invention is provided on the input side and controls the transmission and shut-off of rotational torque input by lever operation, and the rotational torque provided on the output side and input from the lever side clutch unit. Is transmitted to the output side, and has a basic configuration including a brake-side clutch portion that cuts off rotational torque reversely input from the output side.

  The brake side clutch part in this invention is provided with the output member from which rotational torque is output, and the stationary member by which rotation was restrained.

  As a technical means for achieving the above-described object, the present invention attaches a cover surrounding the lever side clutch part and the brake side clutch part to the stationary member, and covers the support part that regulates the inclination of the output member with respect to the axis. It is characterized by being provided in.

  In the present invention, the cover that surrounds the lever-side clutch part and the brake-side clutch part is attached to the stationary member, thereby preventing the foreign matter from entering the lever-side clutch part and the brake-side clutch part with the cover. can do.

  In addition, the cover is provided with a support that regulates the inclination of the output member with respect to the axis, so that the output member can be supported with respect to the stationary member even when a radial load is applied to the output member during reverse input of rotational torque. By supporting at the part, the inclination of the output member with respect to the axis can be regulated.

  In this way, by restricting the inclination of the output member with the support portion of the cover, the support rigidity of the output member can be improved, and the output member can be reliably locked when the rotational torque is reversely input.

  The support portion in the present invention preferably has a structure in which an opening hole through which the output member is inserted is formed in the cover, and the outer peripheral surface of the retaining member attached to the output member is brought into contact with the inner peripheral surface of the opening hole of the cover. . If such a structure is employ | adopted, the inclination of the output member with respect to an axis line can be controlled by supporting an output member with the opening hole of a cover.

  In the present invention, it is desirable to have a structure in which a claw portion is provided on the cover, a notch recess is formed in the stationary member, and the claw portion of the cover is inserted into the notch recess of the stationary member and fixed by crimping. By adopting such a structure, it becomes easy to attach the cover to the stationary member by caulking and fixing the claw portion to the notch recess.

  The clutch unit according to the present invention is suitable for automobile use by incorporating the lever side clutch part and the brake side clutch part into the automobile seat lifter part.

  According to the present invention, the cover that surrounds the lever-side clutch portion and the brake-side clutch portion is attached to the stationary member, so that the cover can prevent foreign matter from entering the lever-side clutch portion and the brake-side clutch portion. You can stop it. As a result, it is possible to prevent an abnormality in the clutch function due to the intrusion of foreign matter and to extend the service life.

  In addition, the cover is provided with a support that regulates the inclination of the output member with respect to the axis, so that the output member can be supported with respect to the stationary member even when a radial load is applied to the output member during reverse input of rotational torque. By supporting at the part, the inclination of the output member with respect to the axis can be regulated.

  In this way, by restricting the inclination of the output member with the support portion of the cover, the support rigidity of the output member can be improved, and the output member can be reliably locked when the rotational torque is reversely input. As a result, the reliability in the clutch operation can be improved.

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 a block diagram which shows the seat seat and seat lifter part of a motor vehicle. It is an assembly exploded perspective view which shows the lever side clutch part of FIG. 1, the brake side clutch part, and a cover.

  An embodiment of a clutch unit according to the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional view showing the overall configuration of the clutch unit of this embodiment, FIG. 2 is a cross-sectional view taken along the line P-P in FIG. 1, and FIG. 3 is a cross-sectional view taken along the 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 provided on the input side and a brake side clutch portion 12 provided on the output side 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 input from the lever side clutch unit 11 to the output side and blocking the rotational torque reversely input from the output side.

  As shown in FIGS. 1 and 2, the lever side clutch unit 11 transmits to the brake side clutch unit 12 the side plate 13 and the outer ring 14 to which rotational torque is input by lever operation, and the rotational torque input from the outer ring 14. Inner ring 15, a plurality of cylindrical rollers 16 that control transmission and interruption of rotational torque from outer ring 14 by engagement and disengagement between outer ring 14 and inner ring 15, and each cylindrical roller 16 at equal intervals in the circumferential direction A retainer 17 for holding, an inner centering spring 18 for returning the retainer 17 to a neutral state, and an outer centering spring 19 for returning the outer ring 14 to a neutral state are provided.

  In the lever side clutch part 11, the claw part 13a formed in the outer peripheral edge part of the side plate 13 is inserted into the notch recess 14a formed in the outer peripheral edge part of the outer ring 14, and the side plate 13 is tightened by tightening. And is integrated as an input member of the lever side clutch portion 11. On the inner periphery of the outer ring 14, a plurality of cam surfaces 14b are formed at equal intervals in the circumferential direction. The input of the rotational torque to the outer ring 14 is performed by an operation lever 43 (see FIG. 4) that can swing in the vertical direction and is attached to the side plate 13 by screwing or the like.

  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 of the diameter-enlarged portion 15b. It consists of a plurality of pillars 15c (see FIG. 3) protruding by bending the part in the axial direction. A wedge clearance 20 is formed between the cylindrical outer peripheral surface 15 d of the cylindrical portion 15 a of the inner ring 15 and the cam surface 14 b formed on the inner periphery of the outer ring 14, and the cylindrical roller 16 is placed in the wedge clearance 20 with the cage 17. Are arranged at equal intervals in the circumferential direction.

  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. It is locked. The inner centering spring 18 is elastically expanded by the rotation of the cage 17 following the outer ring 14 with respect to the cover 24 in a stationary state when the rotational torque input from the outer ring 14 is applied by lever operation. When the rotational torque input from the outer ring 14 is released, the cage 17 is returned to the neutral state by the elastic force.

  The outer centering spring 19 positioned 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 above-described cover 24, and both ends thereof are arranged on the outer ring 14 and the cover 24. It is locked to a part of. The outer centering spring 19 is expanded with the rotation of the outer ring 14 with respect to the cover 24 in a stationary state when the rotational torque input from the outer ring 14 by the lever operation is applied, and an elastic force is accumulated. When the rotational torque input from is released, the outer ring 14 is returned to the neutral state by the elastic force.

  The cage 17 is a resin-made cylindrical member in which a plurality of pockets 17a for accommodating the cylindrical rollers 16 are formed at equal intervals in the circumferential direction. Both end portions of the inner centering spring 18 are engaged with one axial end portion of the retainer 17, that is, the axial end portion on the cover 24 side of the brake side clutch portion 12. The cage 17 is disposed between the outer ring 14 and the inner ring 15 in the radial direction, and is sandwiched between the outer ring 14 and the cover 24 of the brake side clutch portion 12 in the axial direction.

  As shown in FIGS. 1 and 3, the brake-side clutch unit 12, which is called a lock type and has a reverse input blocking function, includes an inner ring 15 to which rotational torque from the lever-side clutch unit 11 is input, Engagement and disengagement between the output shaft 22 as an output member from which the rotational torque from the clutch portion 11 is output, the outer ring 23, the cover 24, and the side plate 25 whose rotation is restricted, and the outer ring 23 and the output shaft 22. Thus, a plurality of pairs of cylindrical rollers 27 that control the interruption of the rotational torque input from the output shaft 22 and the transmission of the rotational torque input from the inner ring 15, and the pairs of cylindrical rollers 27 are circumferentially connected to each other. A leaf spring 28 having an N-shaped cross section for biasing the separating force and a friction ring 29 for imparting rotational resistance to the output shaft 22 are provided.

  The output shaft 22 is integrally formed with a large-diameter portion 22b that extends radially outward and expands in the axially central portion of the shaft portion 22a into which the tubular portion 15a of the inner ring 15 is extrapolated. A pinion gear 22d for connecting to the seat lifter 41 (see FIG. 4) is formed coaxially at the output side end of the shaft 22a. Further, the components of the lever side clutch portion 11 are prevented from coming off by press-fitting a washer 31 as a retaining member through the wave washer 30 to the input side end of the shaft portion 22a.

  On the outer periphery of the large-diameter portion 22b of the output shaft 22, a plurality of flat cam surfaces 22e are formed at equal intervals in the circumferential direction. One plate inserted between two cylindrical rollers 27 and two cylindrical rollers 27 in a wedge clearance 26 provided between the cam surface 22e of the large diameter portion 22b and the cylindrical inner peripheral surface 23a of the outer ring 23. Each of the springs 28 is arranged. 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.

  Here, the inner ring 15 functions as an input member of the brake side clutch part 12 by transmitting the rotational torque input from the outer ring 14 of the lever side clutch part 11 to the output shaft 22 via the enlarged diameter part 15b. The cylindrical roller 27 and the leaf spring 28 are accommodated in the pocket 15f and are held by the column portions 15c at equal intervals in the circumferential direction, thereby functioning as a cage.

  The large diameter portion 22 b of the output shaft 22 is provided with a protrusion 22 f 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.

  The outer ring 23, the cover 24, and the side plate 25 are divided into a notch recess 23 b formed in the outer peripheral edge of the thick plate-like outer ring 23 and a notch recess 24 a formed in the outer peripheral edge of the cover 24. The side plate 25 is fixed to the outer ring 23 and the cover 24 and is integrated as a stationary member of the brake side clutch portion 12 by inserting and crimping the claw portion 25a formed on the outer peripheral edge of the brake.

  The friction ring 29 is a member formed by, for example, a resin material in a ring shape by injection molding or the like, and is fixed to the side plate 25. The friction ring 29 is press-fitted to the inner peripheral surface 22g of the annular recess 22c formed in the large diameter portion 22b of the output shaft 22 with a tightening margin. Due to the frictional force generated between the outer peripheral surface 29b of the friction ring 29 and the inner peripheral surface 22g of the annular recess 22c of the output shaft 22, rotational resistance is applied to the output shaft 22 during lever operation.

  An operation example of the lever side clutch portion 11 and the brake side clutch portion 12 having the above-described configuration 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 cam surface 14 b of the outer ring 14 and the cylindrical outer peripheral surface 15 d of the inner ring 15. To do. 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 as the outer ring 14 and the cage 17 rotate.

  When the rotational torque is no longer input, 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, that is, by the pumping operation of the operation lever.

  In the brake-side clutch portion 12, the cylindrical roller 27 is located between the cam surface 22e of the output shaft 22 and the cylindrical inner peripheral surface 23a of the outer ring 23 even if rotational torque is reversely input to the output shaft 22 by sitting on the seat. The output shaft 22 is locked to the outer ring 23 by engaging with the wedge clearance 26. In this manner, the rotational torque reversely input from the output shaft 22 is locked by the brake side clutch portion 12 and the return to the lever side clutch portion 11 is blocked.

  On the other hand, when the rotational torque from the inner ring 15 of the lever side clutch portion 11 is input to the column portion 15c by the lever operation, the column portion 15c comes into contact with the cylindrical roller 27 and resists the elastic force of the leaf spring 28 to form a cylinder. The roller 27 is pressed. As a result, the cylindrical roller 27 is detached from the wedge clearance 26, and the locked state of the output shaft 22 is released by the separation of the cylindrical roller 27 from the wedge clearance 26, so that the output shaft 22 can rotate. 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 column part 15c of the inner ring 15 further rotates, the clearance between the hole 15e of the enlarged diameter part 15b of the inner ring 15 and the projection 22f of the large diameter part 22b of the output shaft 22 is clogged, and the enlarged diameter part 15b of the inner ring 15 becomes the output shaft 22. The projection 22f is in contact with the projection 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. In other words, when the column portion 15c of the inner ring 15 is jogged and rotated, the output shaft 22 is also jogged and rotated.

  The clutch unit 10 having the structure described in detail above is used by being incorporated in an automobile seat lifter 41 that adjusts the height of a seat by lever operation. FIG. 4 shows a seat 40 installed in the passenger compartment of the automobile.

  As shown in FIG. 4, the seat 40 is composed of a seating seat 48 and a backrest seat 42, and the seat lifter 41 adjusts the height of the seating surface of the seating seat 48. The height of the seating seat 48 is adjusted by the operation lever 43 attached to the side plate 13 of the lever side clutch portion 11 (see FIG. 1) in the clutch unit 10.

  The sheet lifter 41 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 seating seat 48, respectively. 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 22 d of the output shaft 22 of the clutch unit 10.

  For example, when lowering the seating surface of the seating seat 48, the lever side clutch portion 11 is operated, that is, the operation lever 43 is swung downward to lock the brake side clutch portion 12 (see FIG. 1). Release the state. When the brake side clutch portion 12 is unlocked, the seat surface of the seating seat 48 can be lowered smoothly by applying an appropriate rotational resistance to the output shaft 22 by the friction ring 29 (see FIG. 1).

  By releasing the lock at the brake side clutch portion 12, the pinion gear 22d of the output shaft 22 of the brake side clutch portion 12 is rotated clockwise (in FIG. 4) with the rotational torque transmitted from the lever side clutch portion 11 to the brake side clutch portion 12. It rotates in the direction of the arrow. Then, the sector gear 47 meshing with the pinion gear 22d swings counterclockwise (in the direction of the arrow in FIG. 4), and both the link member 45 and the link member 46 are tilted to lower the seating surface of the seating seat 48.

  In this way, after adjusting the height of the seating surface of the seating seat 48, when the operation lever 43 is released, the operation lever 43 is swung 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 seating surface of the seating seat 48 is raised by the reverse operation to that described above. When the operation lever 43 is released after the height of the seating seat 48 is adjusted, the operation lever 43 swings downward and returns to the original position (neutral state).

  The overall configuration of the clutch unit 10 and the seat lifter portion 41 in which the clutch unit 10 is incorporated are as described above. The characteristic configuration of the clutch unit 10 will be described in detail below.

  The clutch unit 10 has a structure in which the output shaft 22 of the brake side clutch portion 12 is connected to a seat lifter portion 41 that adjusts the seat seat 40 up and down. That is, a structure in which the pinion gear 22d of the output shaft 22 meshes with the sector gear 47 of the seat lifter 41 (see FIG. 4).

  In the brake-side clutch portion 12, a radial load is generated at the connecting portion between the pinion gear 22 d of the output shaft 22 and the sector gear 47 of the seat lifter portion 41 when the rotational torque is reversely input by seating on the seat 40. When such a radial load is applied to the output shaft 22, the output shaft 22 may be inclined with respect to the axis of the outer ring 23.

  On the other hand, if the components of the lever side clutch part 11 and the brake side clutch part 12 are in an exposed state, foreign matter such as dust may enter the lever side clutch part 11 and the brake side clutch part 12 from the outside of the clutch unit 10. is there.

  Therefore, the clutch unit 10 regulates the inclination of the output shaft 22 with respect to the axis and prevents the intrusion of foreign matter from the outside, as shown in FIGS. 1 and 5, as shown in FIGS. 1 and 5. A cover 32 that surrounds the portion 12 is attached to the outer ring 23 that is a stationary member of the brake-side clutch portion 11, and a support portion that restricts the inclination of the output shaft 22 with respect to the axis is provided on the cover 32.

  The cover 32 of this embodiment is a cylindrical body having a size capable of surrounding and bending the lever side clutch portion 11 and the brake side clutch portion 12, and has an open end portion 32a at one end and is closed at the other end. It has an end 32c. The cover 32 can be formed by, for example, pressing.

  Claw portions 32b protruding in the axial direction are formed at a plurality of locations in the circumferential direction of the opening end portion 32a located on the brake side clutch portion 12 side of the cover 32. The tip of the claw portion 32b has a bifurcated shape and can be expanded by pressing outwardly for caulking to the outer ring 23. On the other hand, cutout recesses 23 c are formed at a plurality of locations in the circumferential direction on the outer peripheral surface of the outer ring 23 so as to correspond to the claw portions 32 b of the cover 32.

  By inserting the claw portion 32b of the opening end portion 32a of the cover 32 into the cutout concave portion 23c of the outer ring 23 and expanding the tip of the claw portion 32b by pressing outward, the cover 32 is fixed to the outer ring 23 by caulking. To do. In this embodiment, the caulking is exemplified as the attachment of the cover 32 to the outer ring 23, but press fitting may be used.

  An opening hole 32d through which the output shaft 22 and the washer 31 are inserted is formed in the closed end portion 32c located on the lever side clutch portion 11 side of the cover 32. In addition, screw insertion holes 32e for attaching the operation lever 43 (see FIG. 4) to the side plate 13 of the lever side clutch portion 11 are formed at two locations on the radially outer side of the opening hole 32d. The screw insertion hole 32e has a long hole shape so that the operation lever 43 can swing.

  The support portion in the cover 32 of this embodiment is an opening hole 32d formed in the closed end portion 32c of the cover 32, and the outer peripheral surface 31a of the washer 31 attached to the output shaft 22 is connected to the inside of the opening hole 32d of the cover 32. It has a structure in contact with the peripheral surface 32f. In this embodiment, the outer peripheral surface 31 a of the washer 31 is in contact with the inner peripheral surface 32 f of the opening hole 32 d of the cover 32, but the outer peripheral surface of the shaft portion 22 a of the output shaft 22 is the opening hole 32 d of the cover 32. You may make it contact | abut directly on the internal peripheral surface 32f.

  As described above, in the clutch unit 10, the cover 32 that surrounds the lever-side clutch portion 11 and the brake-side clutch portion 12 is attached to the outer ring 23. The cover 32 can prevent the brake side clutch portion 12 from entering. As a result, it is possible to prevent functional abnormality of the lever side clutch portion 11 and the brake side clutch portion 12 due to the entry of foreign matter, and to extend the life of the clutch unit 10.

  Further, the outer peripheral surface 31 a of the washer 31 attached to the output shaft 22 is brought into contact with the inner peripheral surface 32 f of the opening hole 32 d of the cover 32, so that the output shaft 22 is reversely inputted when the rotational torque is input to the output shaft 22. Even when a radial load is applied, the inclination of the output shaft 22 relative to the axis can be regulated by the opening hole 32d of the cover 32. Thereby, since the output shaft 22 does not incline, the cam surface 22e which is a contact surface with the cylindrical roller 27 of the output shaft 22 does not incline, and the support rigidity of the output shaft 22 can be improved.

  As a result, it is possible to prevent the occurrence of a skew in which the cylindrical roller 27 slides with respect to the cam surface 22e of the output shaft 22 and the posture of the cylindrical roller 27 changes. By preventing the cylindrical roller 27 from being skewed, the output shaft 22 can be reliably locked. As a result, the reliability in the clutch operation can be improved.

  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.

DESCRIPTION OF SYMBOLS 10 Clutch unit 11 Lever side clutch part 12 Brake side clutch part 22 Output member (output shaft)
23 Stationary member (outer ring)
23c Notch recess 31 Retaining member (washer)
31a outer peripheral surface 32 cover 32b claw part 32d support part (opening hole)
32f Inner peripheral surface 41 Sheet lifter part

Claims (4)

Provided on the input side, and a lever side clutch part that controls transmission and interruption of rotational torque input by lever operation, and provided on the output side, transmits rotational torque input from the lever side clutch part to the output side. , Consisting of a brake side clutch part that cuts off the rotational torque that is reversely input from the output side,
The brake side clutch portion includes an output member that outputs rotational torque, and a stationary member that is restricted in rotation, and a cover that surrounds the lever side clutch portion and the brake side clutch portion is attached to the stationary member, A clutch unit, characterized in that a support for restricting the inclination of the output member with respect to an axis is provided on the cover.   The support portion has a structure in which an opening hole through which the output member is inserted is formed in the cover, and an outer peripheral surface of a retaining member attached to the output member is brought into contact with an inner peripheral surface of the opening hole. The clutch unit according to claim 1.   The clutch unit according to claim 1 or 2, wherein a claw portion is provided on the cover, a notch recess is formed in the stationary member, and the claw portion of the cover is inserted into the notch recess of the stationary member and fixed by crimping. .   The clutch unit as described in any one of Claims 1-3 in which the said lever side clutch part and the said brake side clutch part are integrated in the seat lifter part for motor vehicles.

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