JP2019178749A - Clutch unit - Google Patents

Abstract

To improve operation feeling by avoiding interference between a centering spring and a claw part of a side plate.SOLUTION: A clutch unit is composed of a lever-side clutch part 11 controlling the transmission and block of input rotational torque, and a brake-side clutch part 12 transmitting the rotational torque from the lever-side clutch part 11 to an output side, and blocking the rotational torque which is reversely input from the output side. The lever-side clutch part 11 has an outside centering spring 19 which is diametrically enlarged by an input of the rotational torque, claw parts 13a, 25a of side plates 13, 25 of the lever-side clutch part 11 and the brake-side clutch part 12 are arranged in the radial outside of the centering spring 19, and the outside centering spring 19 is constituted of a thin-plate shaped member as a relief for maintaining a non-contact state between the side plates 13, 25 and the claw parts 13a, 25a at the diametrical enlargement of the outside centering spring 19.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).

  As shown in FIG. 9, the clutch unit disclosed in Patent Document 1 transmits a lever side clutch portion 111 to which rotational torque is input by lever operation and transmits the rotational torque from the lever side clutch portion 111 to the output side. In addition, a brake-side clutch portion 112 that cuts off rotational torque from the output side is provided.

  The lever side clutch part 111 includes a side plate 113 and an outer ring 114 to which rotational torque is input by lever operation, an inner ring 115 that transmits the rotational torque from the outer ring 114 to the brake side clutch part 112, and a wedge between the outer ring 114 and the inner ring 115. The main part is composed of a cylindrical roller 116 that controls transmission and interruption of rotational torque from the outer ring 114 by engagement and disengagement until the clearance and a centering spring 119 that returns the outer ring 114 to a neutral state.

  The brake-side clutch unit 112 includes an inner ring 115 to which the rotational torque from the lever-side clutch unit 111 is input, an output shaft 122 to which the rotational torque from the inner ring 115 is output, a side plate 125 that is restricted in rotation, an outer ring 123, and The cover 124 and the cylindrical roller 127 that controls the interruption of the rotational torque from the output shaft 122 and the transmission of the rotational torque from the inner ring 115 by engaging and disengaging the wedge between the output shaft 122 and the outer ring 123. Is configured.

  In the lever side clutch portion 111, when rotational torque is input to the outer ring 114 by lever operation, the cylindrical roller 116 engages with the wedge clearance between the outer ring 114 and the inner ring 115. By the engagement of the cylindrical roller 116 up to the wedge clearance, the rotational torque is transmitted to the inner ring 115 and the inner ring 115 rotates.

  In the brake-side clutch portion 112, when rotational torque is reversely input to the output shaft 122 due to seating on the seat, the cylindrical roller 127 engages with the wedge clearance between the output shaft 122 and the outer ring 123, and the output shaft 122 becomes the outer ring. 123 is locked. Due to the locking of the output shaft 122, the rotational torque reversely input from the output shaft 122 is cut off. Thereby, the seat surface height of the seat is maintained.

  On the other hand, when rotational torque is input from the inner ring 115 of the lever side clutch part 111 to the brake side clutch part 112, the inner ring 115 presses the cylindrical roller 127, so that the cylindrical roller 127 is wedged between the output shaft 122 and the outer ring 123. Leave the gap. By the separation of the cylindrical roller 127 until the wedge clearance, the locked state of the output shaft 122 is released, and the output shaft 122 can be rotated.

  Further, when the inner ring 115 further rotates, the rotational torque from the inner ring 115 is transmitted to the output shaft 122, and the output shaft 122 rotates. By the rotation of the output shaft 122, the seat surface height of the seat can be adjusted.

Japanese Patent No. 5207777

  By the way, as shown in FIG. 9, the lever side clutch portion 111 of the conventional clutch unit is formed with a claw portion 113 a extending in the axial direction on the outer peripheral edge portion of the side plate 113 and a notch concave portion on the outer peripheral edge portion of the outer ring 114. 114a is formed.

  In this structure, the claw portion 113a of the side plate 113 is fitted into the notch recess 114a of the outer ring 114, and the tip portion of the claw portion 113a is crimped. Thereby, the side plate 113 is fixed to the outer ring 114, and the side plate 113 and the outer ring 114 are integrated.

  Similarly, the brake side clutch portion 112 has a claw portion 125a extending in the axial direction at the outer peripheral edge portion of the side plate 125, and formed notched recesses 123b and 124a at the outer peripheral edge portions of the outer ring 123 and the cover 124. It has a structure.

  In this structure, the claw portion 125a of the side plate 125 is fitted into the outer ring 123 and the cutout recesses 123b and 124a of the cover 124, and the tip portion of the claw portion 125a is crimped. Thereby, the side plate 125 is fixed to the outer ring 123 and the cover 124, and the side plate 125, the outer ring 123, and the cover 124 are integrated.

  On the other hand, when rotational torque is input to the outer ring 114 by lever operation, elastic force is accumulated in the centering spring 119 as the outer ring 114 rotates. At this time, as indicated by a broken line in FIG. 9, the centering spring 119 disposed between the outer ring 114 and the cover 124 of the brake side clutch portion 112 increases in diameter.

  When the diameter of the centering spring 119 is increased during the lever operation, the claw portions 113a and 125a of the side plates 113 and 125 of the lever side clutch portion 111 and the brake side clutch portion 112 are close to the centering spring 119 on the radially outer side. 119 may interfere with the claw portions 113a and 125a of the side plates 113 and 125 (see the broken line in FIG. 9).

  As described above, when the centering spring 119 interferes with the claw portions 113a and 125a of the side plates 113 and 125, the operation torque at the time of lever operation increases, and the operation feeling is deteriorated.

  Accordingly, the present invention has been proposed in view of the above-described problems, and an object of the present invention is to provide a clutch unit that can avoid the interference between the centering spring and the claw portion of the side plate and can improve the operation feeling. There is to do.

  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.

  As technical means for achieving the above-mentioned object, the input-side clutch portion of the present invention has an elastic member whose diameter is increased by the input of rotational torque, and constitutes the input-side clutch portion and the output-side clutch portion, respectively. A connecting portion where a plurality of constituent members are connected to each other is disposed on the radially outer side of the elastic member, and the elastic member has a relief portion for maintaining a non-contact state with the connecting portion when the diameter of the elastic member is increased Is provided.

  In the present invention, since the relief is provided in the elastic member, even if the diameter of the elastic member is increased by the input of the rotational torque at the input side clutch portion, the elastic member and the structural member are connected by the amount of relief provided in the elastic member. There is room in the separation distance from the part. Thereby, it can avoid that an elastic member interferes with the connection part of structural members.

  The elastic member in the present invention is a thin plate-like member formed in a C-shape, and a structure in which a rib projecting radially outward is formed on the outer peripheral surface of the thin plate-like member.

  If such a structure is employ | adopted, to comprise an elastic member with a thin plate-shaped member will become the relief for maintaining a non-contact state with a connection part at the time of diameter expansion of an elastic member. There is a margin in the separation distance between the elastic member and the connecting portion of the constituent members by the amount of the escape. Thereby, it can avoid that an elastic member interferes with the connection part of structural members.

  The elastic member in the present invention is a strip-shaped member formed in a C-shape, and a structure in which a concave step portion is provided at a portion corresponding to the connecting portion on the outer peripheral surface of the strip-shaped member is desirable.

  If such a structure is employ | adopted, the recessed step part provided in the elastic member will become the escape for maintaining a non-contact state with a connection part at the time of diameter expansion of an elastic member. There is a margin in the separation distance between the elastic member and the connecting portion of the constituent member by the amount of the relief. Thereby, it can avoid that an elastic member interferes with the connection part of structural members.

  The clutch unit according to the present invention preferably has a structure in which the input-side clutch portion and the output-side clutch portion are incorporated in the vehicle seat lifter portion.

  If such a structure is adopted, the input side clutch part is the lever side clutch part, and the output side clutch part is the brake side clutch part, thereby improving the operational feeling during lever operation in the automobile seat lifter part. I can plan.

  According to the present invention, since the relief is provided in the elastic member, even if the diameter of the elastic member is increased by the input of the rotational torque at the input side clutch portion, the elastic member and the constituent member are provided by the amount of relief provided in the elastic member. There is a margin in the separation distance from the connecting portion. Thereby, it can avoid that an elastic member interferes with the connection part of a structural member.

  By avoiding the interference with the connecting portions of the constituent members by the escape of the elastic member, when the clutch unit is incorporated in the automobile seat lifter portion, it is possible to suppress an increase in the operating torque during the lever operation and to improve the operation feeling. .

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 a perspective view which shows the outer side centering spring of FIG. It is a fragmentary sectional view which shows the outer side centering spring of FIG. It is sectional drawing which shows the whole structure of a clutch unit in other embodiment of this invention. It is sectional drawing which shows the whole structure of a clutch unit in other embodiment of this invention. It is sectional drawing which shows the whole structure of the conventional 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 and 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. And the main part is composed.

  The side plate 13 and the outer ring 14 are two members that are connected and integrated as constituent members of the lever-side clutch portion 11, and rotational torque is input by lever operation. The input of the rotational torque to the outer ring 14 is performed by an operation lever 43 (see FIG. 4) attached to the side plate 13.

  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. A caulking portion between the claw portion 13 a and the outer ring 14 corresponds to a connecting portion of the constituent members constituting the lever side clutch portion 11.

  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 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.

  The cage 17 has a plurality of pockets 17a for accommodating the cylindrical rollers 16 formed at equal intervals in the circumferential direction. The retainer 17 holds the cylindrical rollers 16 at equal intervals in the circumferential direction in the wedge clearance 20 between the cam surface 14 b of the outer ring 14 and the outer peripheral surface 15 d 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 is returned 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, and both ends thereof are arranged on the outer ring. 14 and a part of the cover 24.

  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 is returned 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 plurality of pairs (a column portion 15 c of the inner ring 15 extending from the lever side clutch portion 11, an output shaft 22, an outer ring 23, a cover 24, and side plates 25. The main part is composed of 6 pairs of cylindrical rollers 27, a leaf spring 28 having an N-shaped cross section, and a friction ring 29.

  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. The rotation torque from the lever side clutch part 11 is output.

  The pinion gear portion 22d of the output shaft 22 is connected to the seat lifter portion 39 (see FIG. 4). Further, the washer 31 is press-fitted into the input side end portion of the shaft portion 22a via the wave washer 30, thereby preventing the constituent members 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 a single 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.

  The cylindrical rollers 27 and the leaf springs 28 are arranged at equal intervals in the circumferential direction by column portions 15 c of the inner ring 15 having a function of transmitting the rotational torque input from the outer ring 14 to the output shaft 22. That is, the column part 15c of the inner ring 15 has a function of accommodating the cylindrical roller 27 and the leaf spring 28 in the pocket 15f and holding them at equal intervals in the circumferential direction.

  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.

  The outer ring 23, the cover 24, and the side plate 25 are three members that are connected and integrated as constituent members of the brake side clutch portion 12, and are stationary members whose rotation is restricted.

  The outer ring 23, the cover 24, and the side plate 25 are formed in the outer peripheral edge portion of the side plate 25 in the notch recesses 23 b and 24 a formed in the outer peripheral edge portion of the outer ring 23 and the cover 24, and extend toward the lever side clutch portion 11. The claws 25a are integrated by fitting and crimping. The caulking portion between the claw portion 25a, the outer ring 23, and the cover 24 corresponds to a connecting portion of the constituent members constituting the brake side clutch portion 12.

  The friction ring 29 is, for example, a resin member and is fixed to the side plate 25. 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.

  An output shaft that slides on the friction ring 29 attached to the side plate 25 when the lever is operated by a 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. A rotational resistance (sliding torque) is applied to 22.

  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 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 as the outer ring 14 and the cage 17 rotate.

  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. 4).

  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 if the rotational torque is reversely input to the output shaft 22 by sitting on the seat 40 (see FIG. 4). is doing. The output shaft 22 is locked to the outer ring 23 by the engagement of the cylindrical roller 27 in the wedge clearance 26.

  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, in the brake side clutch portion 12, the column portion 15 c of the inner ring 15 comes into contact with the cylindrical roller 27 and the elastic force of the leaf spring 28. The cylindrical roller 27 is pressed against this.

  As a result, the cylindrical roller 27 is detached from the wedge clearance 26. By the separation of the cylindrical roller 27 in the wedge clearance 26, the locked state of the output shaft 22 is released 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. 4 shows a seat 40 installed in the passenger compartment of the automobile.

  As shown in FIG. 4, the seat surface height of the seat 40 of 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 11 of 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. 3) applies an appropriate rotational resistance (sliding torque) to the output shaft 22 so that the seat surface of the seat 40 can be lowered smoothly. can do.

  The pinion gear portion 22d of the output shaft 22 of the brake side clutch portion 12 is rotated clockwise (FIG. 4) with the rotational torque transmitted from the lever side clutch portion 11 to the brake side clutch portion 12 due to the unlocking at the brake side clutch portion 12. (In the direction of the arrow).

  Then, the sector gear 47 that meshes with the pinion gear portion 22d swings in the counterclockwise direction (the arrow direction in FIG. 4), 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. The outer centering spring 19 (see FIG. 1) of the lever side clutch portion 11 that is a characteristic configuration will be described in detail below.

  As shown in FIG. 1, the outer centering spring 19 in this embodiment is formed of a thin plate member having a smaller plate thickness than the conventional outer centering spring 119 (see FIG. 9).

  Thus, since the plate | board thickness of the outer side centering spring 19 is small, it is necessary to ensure the elastic force for returning the outer ring | wheel 14 to a neutral state at the time of lever operation. Therefore, a rib 19a that protrudes radially outward is integrally formed on the outer peripheral surface of the outer centering spring 19 (see FIGS. 5 and 6).

  The portion of the outer centering spring 19 of this embodiment whose thickness is smaller than that of the conventional outer centering spring 119 (see FIG. 9) (portion where the rib 19a is not provided) is close to the outer side of the outer centering spring 19 in the radial direction. The lever side clutch portion 11 and the brake side clutch portion 12 are escaped to maintain a non-contact state with the claw portions 13a and 25a of the side plates 13 and 25. The plate thickness of the outer centering spring 19 where the ribs 19 a are not provided is smaller than the wire diameter of the inner centering spring 18.

  That is, in the lever side clutch portion 11, when rotational torque is input to the outer ring 14 by lever operation, elastic force is accumulated in the outer centering spring 19 as the outer ring 14 rotates. At this time, the outer centering spring 19 is expanded in diameter as indicated by the broken line in FIG.

  When the diameter of the outer centering spring 19 is increased, the outer centering spring 19 and the side plates 13 and 25 are displaced by an amount corresponding to the clearance for maintaining the non-contact state between the outer centering spring 19 and the claws 13a and 25a of the side plates 13 and 25. There is a margin in the distance between the claw portions 13a and 25a.

  Thereby, it can avoid that the outer side centering spring 19 interferes with the nail | claw parts 13a and 25a of the side plates 13 and 25. FIG. By avoiding the interference with the claw portions 13a and 25a of the side plates 13 and 25 by the escape of the outer centering spring 19, an increase in the operation torque during the lever operation can be suppressed, and the operation feeling can be improved.

  In this embodiment, a rib 19 a is provided at the center in the plate width direction of the outer peripheral surface of the outer centering spring 19. As described above, by providing the rib 19a at the central portion in the plate width direction of the outer centering spring 19, the rib 19a interferes with the claw portions 13a and 25a of the side plates 13 and 25 when the diameter of the outer centering spring 19 is increased. No (see broken line in FIG. 1).

  The rib 19a may be formed at a position that does not interfere with the claw portions 13a and 25a of the side plates 13 and 25 when the outer centering spring 19 is expanded, and the rib 19a is formed at any position. Moreover, if the rib 19a is a protrusion amount that does not interfere with the claw portions 13a and 25a of the side plates 13 and 25, the formation position of the rib 19a is not restricted.

  In this embodiment, the annular rib 19a is provided over the entire circumference of the outer peripheral surface of the outer centering spring 19, but depending on the required elastic force, along the circumferential direction of the outer peripheral surface of the outer centering spring 19. You may form partially. Moreover, although the rib 19a is provided integrally, you may make it attach separately.

  In the above embodiment, the outer centering spring 19 having a smaller plate thickness than the conventional outer centering spring 119 (see FIG. 9) has been described. However, as shown in FIG. 7, the plate thickness equivalent to the conventional outer centering spring 119 is obtained. It is also possible to configure the outer centering spring 32 with a band plate-like member having

  As shown in FIG. 7, the outer centering spring 32 has a portion corresponding to the claw portions 13a and 25a of the side plates 13 and 25 on the outer peripheral surface of the band plate member (the tip portion of the claw portions 13a and 25a and the axial position thereof are A concave step 32a is provided in the overlapping portion. In FIG. 7, the same parts as those in FIG.

  The recessed step portion 32a is formed only in a portion corresponding to the claw portions 13a and 25a of the side plates 13 and 25 along the circumferential direction of the outer peripheral surface of the outer centering spring 32, and the entire outer peripheral surface of the outer centering spring 19 is formed. It may be formed over the circumference.

  Thus, the recessed step 32a provided on the outer peripheral surface of the outer centering spring 32 is a relief for maintaining the non-contact state with the claw portions 13a and 25a of the side plates 13 and 25 when the outer centering spring 32 is expanded in diameter. It becomes.

  There is a margin in the separation distance between the outer centering spring 32 and the claw portions 13a and 25a of the side plates 13 and 25 by the amount of the relief. With this margin, it is possible to avoid the outer centering spring 32 from interfering with the claw portions 13a and 25a of the side plates 13 and 25.

  FIG. 8 shows an overall configuration of the clutch unit 10 according to another embodiment of the present invention. In FIG. 8, the same parts as those in FIG.

  The clutch unit 10 of this embodiment has a structure in which the radial positions of the claw portions 13 a and 25 a of the side plates 13 and 25 in the lever side clutch portion 11 and the brake side clutch portion 12 are radially inward from the inner diameter of the outer centering spring 19. It comprises.

  As described above, the radial positions of the claw portions 13a and 25a of the side plates 13 and 25 are set to be radially inward from the inner diameter of the outer centering spring 19, so that when the outer centering spring 19 is expanded, the outer centering spring 19 is moved to the side plate. There is no contact with the claw portions 13a and 25a of the 13 and 25. Thereby, it can avoid that the outer side centering spring 19 interferes with the nail | claw parts 13a and 25a of the side plates 13 and 25. 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 equivalent meanings 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)
13, 14 Components (side plates, outer rings)
13a Connection part (claw part)
19 Elastic member (outer centering spring)
23, 24, 25 Constituent members (outer ring, cover, side plate)
25a Connecting part (claw part)
39 Seat lifter

Claims (4)

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 input-side clutch portion has an elastic member that expands by input of rotational torque,
A connecting portion where a plurality of constituent members respectively constituting the input side clutch portion and the output side clutch portion are connected to each other is disposed on the radially outer side of the elastic member,
The clutch unit, wherein the elastic member is provided with an escape portion for maintaining a non-contact state with the connecting portion when the diameter of the elastic member is increased.   2. The clutch unit according to claim 1, wherein the elastic member is a thin plate-like member formed in a C shape, and has a structure in which a rib protruding outward in the radial direction is formed on an outer peripheral surface of the thin plate-like member.   The said elastic member is a strip | belt-plate-shaped member shape | molded by C shape, and has the structure which provided the recessed step part in the site | part corresponding to the said connection part in the outer peripheral surface of the said strip | plate-shaped member. Clutch unit.   The clutch unit as described in any one of Claims 1-3 in which the said input side clutch part and the said output side clutch part are integrated in the seat lifter part for motor vehicles.

Images