JP2011169402A - Clutch unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the aging deterioration in the fastening of a friction ring. <P>SOLUTION: This clutch unit includes a lever side clutch part provided on the input side for controlling the transmission/interruption of rotation torque to/from the output side with the operation of a lever, and a brake side clutch part provided on the output side for transmitting input torque from the lever side clutch part to the output side and interrupting reverse input torque from the output side. The brake side clutch part includes an output shaft 22 from which torque is output, a brake-side side plate whose rotation is constrained, and the friction ring 29 provided on the brake-side side plate for imparting rotation resistance to the output shaft 22 with friction force generated between the output shaft 22 and itself when pressed into the output shaft 22. The friction ring 29 is formed of polybutylene terephthalate which is a raw material for maintaining the interference with the output shaft 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  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 side member and an output side member. The clutch portion is configured to control transmission / cutoff of input torque by engaging / disengaging an engagement element such as a cylindrical roller or a ball in a wedge clearance formed between the input side member and the output side member. It has become.

  The present applicant, for example, is incorporated in an automobile seat lifter that adjusts the seat seat up and down by lever operation, and transmits a rotational torque from the input side to the output side, and outputs a rotational torque from the input side. A clutch unit having a brake side clutch portion that transmits to the side and interrupts reverse input torque from the output side has been previously proposed (for example, see Patent Document 1).

  28 is a longitudinal sectional view showing the entire configuration of the conventional clutch unit disclosed in the above-mentioned Patent Document 1, FIG. 29 is a sectional view taken along the line DD of FIG. 28, and FIG. 30 is a line EE of FIG. FIG.

  As shown in FIGS. 28 and 29, the lever-side clutch unit 111 includes a lever-side outer ring 114 as an input-side member to which torque is input by lever operation, and torque from the lever-side outer ring 114 as a brake-side clutch unit 112. And a cylindrical roller 116 as a plurality of engagement elements for controlling transmission / interruption of input torque from the lever-side outer ring 114 by engagement / disengagement between the lever-side outer ring 114 and the inner ring 115. A retainer 117 that holds each cylindrical roller 116 at a predetermined interval in the circumferential direction, a brake side outer ring 123 as a stationary side member whose rotation is restricted, and a cage 117 and a brake side outer ring 123. The elastic force is accumulated by the input torque from the lever side outer ring 114, and the cage 117 is moved by the accumulated elastic force by releasing the input torque. An inner centering spring 118 as a first elastic member to be returned to the state, provided between the lever side outer ring 114 and the brake side outer ring 123, accumulates an elastic force by an input torque from the lever side outer ring 114, and the input torque The main part is constituted by the outer centering spring 119 as a second elastic member that returns the lever-side outer ring 114 to the neutral state by the accumulated elastic force.

  In the figure, 113 is a lever side plate that is fixed to the lever side outer ring 114 by caulking and constitutes an input side member together with the lever side outer ring 114, and 131 is a washer attached to the output shaft 122 via a wave washer 130. .

  On the other hand, as shown in FIGS. 28 and 30, the brake side clutch portion 112 is a brake side outer ring 123 as a stationary side member whose rotation is restricted, and a connecting member to which torque from the lever side clutch portion 111 is input. The inner ring 115, the brake side outer ring 123 and the output shaft 122 are disposed in a wedge clearance. The engagement / disengagement between the brake side outer ring 123 and the output shaft 122 causes transmission of input torque from the inner ring 115 and output shaft 122. The main part is composed of a plurality of pairs of cylindrical rollers 127 that control the interruption of the reverse input torque.

  The enlarged diameter portion 115c that extends radially outward from the axial end portion of the inner ring 115 and bends in the axial direction functions as a cage that holds the cylindrical rollers 127 at predetermined intervals in the circumferential direction. In the figure, reference numerals 124 and 125 denote a cover and a brake side plate that form a stationary member together with the brake side outer ring 123. The brake side outer ring 123 and the cover 124 are integrally crimped and fixed by the brake side plate 125. Reference numeral 128 denotes a leaf spring having an N-shaped cross section, for example, disposed between each pair of cylindrical rollers 127, and 129 is a friction ring as a braking member attached to the brake side plate 125.

JP 2009-210114 A

  Incidentally, in the conventional clutch unit disclosed in Patent Document 1, the friction ring 129 as a braking member attached to the brake side plate 125 is press-fitted into the annular recess 122b formed in the output shaft 122 with a tightening margin. A rotational resistance is applied to the output shaft 122 by a frictional force generated between the inner peripheral surface 122e of the annular recess 122b of the output shaft 122 by tightening (see FIGS. 28 and 30).

  However, it is difficult to maintain the interference with the output shaft 122 due to deterioration with time of the material constituting the friction ring 129. As a result, when an excessive torque is applied to the output shaft 122, the friction ring 129 is fastened to the output shaft 122 when the brake-side clutch portion 112 is unlocked by lever operation of the lever-side clutch portion 111. Since it becomes difficult to give a predetermined rotational resistance to the output shaft 122 due to a reduction in the allowance, there is a possibility that the surface pressure of the cylindrical roller 127 increases and a large vibration occurs. Such vibration is uncomfortable for passengers who adjust the seat up and down by lever operation.

  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 reduce a reduction in the tightening allowance of the friction ring over time.

  The clutch unit according to the present invention is provided on the input side, and controls the transmission / cut-off of rotational torque to the output side by lever operation, and the input side torque from the lever side clutch unit provided on the output side. Is transmitted to the output side, and the brake side clutch portion for cutting off the reverse input torque from the output side is provided.

  In the present invention, the brake-side clutch portion is provided between the output-side member from which torque is output, the stationary-side member whose rotation is restricted, and the stationary-side member, and press-fitted into the output-side member. And a friction ring for imparting rotational resistance to the output side member by the frictional force generated in the above.

  As a technical means for achieving the above-described object, the clutch unit of the present invention is characterized in that the friction ring is made of a material capable of maintaining a tightening allowance with the output side member. As a material of this friction ring, polybutylene terephthalate (PBT) is suitable.

  In the present invention, since the friction ring is made of a material capable of maintaining the tightening allowance with the output side member, for example, polybutylene terephthalate, the friction ring tightening allowance can be easily reduced over time. Can do. As a result, even when an excessive torque is applied to the output side member, a predetermined rotational resistance is applied to the output side member when releasing the lock state of the brake side clutch portion by lever operation at the lever side clutch portion. Therefore, it can suppress that the surface pressure of a cylindrical roller rises and a big vibration generate | occur | produces.

  The friction ring in the present invention preferably has a circular inner diameter. In this way, the rigidity of the friction ring can be increased, and the durability of the entire clutch unit can be improved.

  The friction ring according to the present invention preferably has a structure in which the chamfering angle of the chamfered portion formed in the peripheral portion of the annular recess is 20 ° to 25 ° by being press-fitted into the annular recess formed in the output side member. In this way, when the friction ring is press-fitted into the annular recess of the output side member, the friction ring can be smoothly press-fitted into the annular recess and the occurrence of burrs can be suppressed.

  The lever side clutch portion in this clutch unit includes an input side member to which torque is input by lever operation, a connecting member that transmits torque from the input side member to the brake side clutch portion, and between the input side member and the connecting member. A plurality of engagement elements that control transmission / cutoff of input torque from the input side member by engagement / disengagement, a cage that holds the engagement elements at predetermined intervals in the circumferential direction, and a stationary side member that is restricted in rotation And an elastic force that is provided between the cage and the stationary member, accumulates an elastic force with an input torque from the input side member, and releases the input torque to return the cage to a neutral state with the accumulated elastic force. One elastic member, provided between the input side member and the stationary side member, accumulates the elastic force with the input torque from the input side member, and releases the input torque to cause the input side member to move with the accumulated elastic force. Neutral state Configuration and a second elastic member for restoring are possible. In addition, it is desirable that the engaging member of the lever side clutch is a cylindrical roller.

  The brake side clutch portion in the clutch unit includes a connecting member to which torque from the lever side clutch portion is input, an output side member to which torque is output, a stationary side member in which rotation is constrained, and a stationary side member thereof. Plural pairs of engagement elements disposed in the wedge clearance between the output side members and controlling transmission of input torque from the connecting member and blocking of reverse input torque from the output side member by engagement / disengagement between the two members A configuration with The engaging member of the brake side clutch is preferably a cylindrical roller.

  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. In this case, the input side member is coupled to the operation lever, and the output side member is connected to the link mechanism of the automobile seat lifter unit.

  According to the present invention, since the friction ring is made of a material that can maintain the tightening allowance with the output side member, for example, polybutylene terephthalate, it is easily reduced that the tightening allowance of the friction ring decreases with time. can do. As a result, even when an excessive torque is applied to the output side member, a predetermined rotational resistance is applied to the output side member when releasing the lock state of the brake side clutch portion by lever operation at the lever side clutch portion. Therefore, it is possible to suppress the occurrence of large vibrations due to an increase in the surface pressure of the cylindrical rollers, and when the clutch unit is incorporated in the seat lifter for an automobile, the lever operation for adjusting the seat seat up and down is also good and a comfortable lever Operation can be realized.

It is a longitudinal section showing the whole clutch unit composition in an embodiment of the present invention. It is a right view of FIG. It is a left view of FIG. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. (A) is sectional drawing which shows a lever side side board, (b) is a left view of (a). (A) is sectional drawing which shows an example of a lever side outer ring | wheel, (b) is a left view of (a), (c) is a right view of (a). (A) is sectional drawing which shows an inner ring | wheel, (b) is a left view of (a). It is a perspective view which shows a holder | retainer. (A) is sectional drawing which shows a holder | retainer, (b) is a left view of (a), (c) is sectional drawing of (a). (A) is a front view which shows an inner side centering spring, (b) is a right view of (a). (A) is a side view showing an outer centering spring, (b) is a partially enlarged bottom view of (a). (A) is the perspective view which looked at the output shaft from one side, (b) is the perspective view which looked at the output shaft from the other side. (A) is sectional drawing which shows an output shaft, (b) is a left view of (a), (c) is a right view of (a). (A) is sectional drawing which shows a brake side outer ring | wheel, (b) is a left view of (a). (A) is sectional drawing which shows a cover, (b) is a left view of (a). (A) is sectional drawing which shows a brake side side board, (b) is a right view of (a). (A) is a front view showing a friction ring, (b) is a left side view of (a), and (c) is a right side view of (a). It is a partial expanded sectional view which shows the state before attaching a friction ring to an output shaft by press-fitting. It is sectional drawing which shows the shaping die for manufacturing a friction ring. (A) is a perspective view which shows the state before attaching a brake side outer ring | wheel to a brake side side plate, (b) is a perspective view which shows the state after attaching a brake side outer ring | wheel to a brake side side plate. It is a perspective view which shows the state which assembled | attached the brake side outer ring | wheel and the cover to the brake side side plate. It is a perspective view which shows the state which integrated the brake side side board, the brake side outer ring | wheel, and the cover by crimping. It is sectional drawing which follows the CC line of FIG. (A) is a perspective view showing a state before the cage is assembled to the brake side plate, the brake side outer ring, the cover and the inner centering spring, and (b) is the brake side plate, the brake side outer ring, the cover and the inner centering spring. It is a perspective view which shows the state after attaching a holder | retainer with respect to. It is a conceptual diagram which shows the seat seat of a motor vehicle. (A) is a conceptual diagram which shows one structural example of a sheet lifter part, (b) is the principal part enlarged view. It is a longitudinal cross-sectional view which shows the whole structure of the conventional clutch unit. FIG. 29 is a transverse sectional view taken along the line DD of FIG. 28. FIG. 29 is a transverse sectional view taken along line EE in FIG. 28.

  1 is a longitudinal sectional view showing an overall configuration of a clutch unit X according to an embodiment of the present invention, FIG. 2 is a right side view of the clutch unit X shown in FIG. 1, and FIG. 3 is a left side view of the clutch unit X shown in FIG. 4 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 5 is a cross-sectional view taken along line BB in FIG. 6 to 18 are diagrams showing main components of the clutch unit X. FIG. 19 to 25 are views showing an assembled state of main components of the clutch unit X. FIG.

  The clutch unit X is incorporated in an automobile seat lifter section (see FIGS. 26 and 27A and 27B) that adjusts the height of the seat by lever operation, for example. As shown in FIGS. 1 to 5, the clutch unit X is formed by unitizing a lever side clutch portion 11 provided on the input side and a brake side clutch portion 12 having a reverse input cutoff function provided on the output side. It has a configuration.

  As shown in FIGS. 1, 2 and 4, the lever side clutch portion 11 includes, for example, a lever side plate 13 and a lever side outer ring 14 as input side members to which an operation lever (not shown) is connected, and the lever. A wedge clearance 20 formed between an inner ring 15 as a connecting member that transmits torque from the side outer ring 14 to the brake-side clutch portion 12, and an outer peripheral surface 15 a of the inner ring 15 and an inner peripheral surface 14 a of the lever-side outer ring 14. For example, a plurality of cylindrical rollers 16 as engagement elements disposed on the holder, a retainer 17 that retains the cylindrical rollers 16 at equal intervals in the circumferential direction, and a first elasticity for returning the retainer 17 to a neutral state It has an inner centering spring 18 that is a member and an outer centering spring 19 that is a second elastic member for returning the lever-side outer ring 14 to a neutral state. A washer 31 is press-fitted into the end of the output shaft 22 described later via a wave washer 30 to prevent the component parts from coming off (see FIG. 1).

  The brake-side clutch portion 12 having a reverse input blocking function, which is called a lock type, has an inner ring as a connecting member to which torque from the lever-side clutch portion 11 is input as shown in FIGS. 15, an output shaft 22 as an output side member, a brake side outer ring 23, a cover 24 and a brake side plate 25 as stationary side members whose rotation is restricted, and a wedge clearance between the brake side outer ring 23 and the output shaft 22. Cylindrical rollers 27 as a plurality of pairs of engagement elements, which are arranged at 26 and control transmission of input torque from the inner ring 15 and interruption of reverse input torque from the output shaft 22 by engagement / disengagement between both members, The main part is composed of, for example, a leaf spring 28 having an N-shaped cross section as an elastic member that is inserted between each pair of cylindrical rollers 27 and biases a separation force between the cylindrical rollers 27. The output shaft 22 is provided with a protrusion 22f, and a hole 15d into which the protrusion 22f is inserted with a clearance is provided in the inner ring 15 (see FIG. 1).

  Next, main components of the lever side clutch part 11 and the brake side clutch part 12 in the clutch unit X will be described in detail.

  FIGS. 6A and 6B show the lever side plate 13 of the lever side clutch portion 11. The lever side plate 13 has a hole 13a through which the output shaft 22 and the inner ring 15 are inserted at a central portion thereof, and a plurality of (for example, five) claw portions 13b project from the outer peripheral edge. These claw portions 13b are bent in the axial direction to have a bifurcated tip, and are inserted into a notch recess 14e (see FIG. 7C) of the lever side outer ring 14 to be described later. By expanding outward, the lever side plate 13 is fixed by crimping to the lever side outer ring 14. In addition, the code | symbol 13c in a figure is the several (for example, four) hole for attaching the operation lever (not shown) for operating the height adjustment of a seat to the lever side side board 13. FIG.

  FIGS. 7A to 7C show the lever-side outer ring 14. The lever-side outer ring 14 is formed by pressing a single plate-shaped material into a cup shape, and a hole 14b through which the output shaft 22 and the inner ring 15 are inserted is formed in the center part 14c. A plurality of cam surfaces 14a are formed at equal intervals in the circumferential direction on the inner periphery of the cylindrical portion 14d extending in the axial direction (see FIG. 4).

  A plurality of (for example, three) claw portions 14f and 14g project from the outer peripheral edge portion of the lever-side outer ring 14 and are bent in the axial direction. Of these claw portions 14f and 14g, one claw portion 14f is inserted and disposed between two locking portions 19a (see FIG. 12A) of an outer centering spring 19 to be described later, and the remaining two are locked. The claw portion 14g slides on the end face of the brake side outer ring 23 by the rotation of the lever side outer ring 14 in contact with the end face of the brake side outer ring 23 described later, and serves as a rotation stopper provided on the outer periphery of the cover 24. By moving between a pair of locking portions 24e and 24f (see FIG. 16B) and making contact with each of the locking portions 24e and 24f at the moving ends in the rotational direction, the operating angle of the operating lever To regulate.

  On the outer periphery of the lever-side outer ring 14, a plurality of (five in the figure) notch recesses 14e into which the claw portions 13b of the lever-side side plate 13 (see FIGS. 6A and 6B) are inserted are formed. The lever side plate 13 and the lever side outer ring 14 are connected by crimping the claw portion 13b of the lever side plate 13 inserted into the notch recess 14e. The lever side outer ring 14 and the lever side plate 13 fixed by crimping to the lever side outer ring 14 constitute an input side member of the lever side clutch portion 11.

  FIGS. 8A and 8B show the inner ring 15. The inner ring 15 includes an outer peripheral surface 15a that forms a wedge clearance 20 (see FIG. 4) between the outer diameter of the cylindrical portion 15b through which the output shaft 22 is inserted and the cam surface 14a of the lever-side outer ring 14. . Further, an enlarged diameter portion 15c extending radially outward from the end of the cylindrical portion 15b and bent in the axial direction is integrally formed, and the enlarged diameter portion 15c functions as a cage for the brake side clutch portion 12. Therefore, pockets 15e for accommodating the cylindrical rollers 27 and the leaf springs 28 are formed at equal intervals in the circumferential direction. In addition, the code | symbol 15d in a figure is a hole into which the protrusion 22f (refer FIG. 1) of the output shaft 22 is inserted with a clearance.

  9 and 10 (a) to 10 (c) show a cage 17 made of resin. The cage 17 is a cylindrical member in which a plurality of pockets 17a for accommodating the cylindrical rollers 16 are formed at equal intervals in the circumferential direction. Two notch recesses 17b are formed at one end of the retainer 17, and the locking part 18a of the inner centering spring 18 is locked to two adjacent end surfaces 17c of each notch recess 17b. (See FIG. 24).

  11A and 11B show the inner centering spring 18. The inner centering spring 18 is formed of a C-shaped spring member having a circular cross section having a pair of engaging portions 18a bent radially inward, and is located on the inner diameter side of the outer centering spring 19 (see FIG. 24). The inner centering spring 18 is disposed between the cage 17 and a cover 24 that is a stationary side member of the brake side clutch portion 12, and both locking portions 18 a are two end surfaces 17 c of the cage 17 (see FIG. 9 and FIG. 9). 10 (b)] and at the claw portion 24b (see FIGS. 16 (a) and 16 (b)) provided on the cover 24 (see FIGS. 24, 25 (a) and 25 (b)). )reference〕.

  In the inner centering spring 18, when the input torque from the lever side outer ring 14 is applied, one locking portion 18 a is on one end surface 17 c of the cage 17, and the other locking portion 18 a is on the claw portion 24 b of the cover 24. As the lever-side outer ring 14 rotates, the inner centering spring 18 is pushed and expanded to accumulate elastic force. When the input torque from the lever-side outer ring 14 is released, the elastic restoring force causes the cage 17 to move. Is returned to the neutral state.

  12A and 12B show the outer centering spring 19. The outer centering spring 19 is a strip-shaped spring member having a C-shape and having a pair of locking portions 19a whose both ends are bent radially outward, and is located on the outer diameter side of the inner centering spring 18 ( (See FIG. 24). The outer centering spring 19 is disposed between the lever-side outer ring 14 of the lever-side clutch portion 11 and the cover 24 of the brake-side clutch portion 12, and both locking portions 19 a are claw portions 14 f provided on the lever-side outer ring 14. It is locked to [see FIGS. 7 (a) to 7 (c)] and is locked to a claw portion 24d (see FIGS. 16 (a) and 16 (b)) provided on the cover 24 [FIG. 25 (a)]. (See (b)). The locking portion 19a is arranged with a circumferential phase (180 °) shifted from the locking portion 18a of the inner centering spring 18 (see FIG. 24).

  In the outer centering spring 19, when the lever side outer plate 14 is rotated by the lever operation by the lever operation and the lever side outer ring 14 rotates, one locking portion 19 a is engaged with the claw portion 14 f of the lever side outer ring 14 and the other engagement. Since the stop portions 19a are respectively engaged with the claw portions 24d of the cover 24, the outer centering spring 19 is pushed and expanded with the rotation of the lever side outer ring 14, and the elastic force is accumulated, and the input torque from the lever side outer ring 14 is increased. When opened, the lever-side outer ring 14 is returned to the neutral state by the elastic restoring force.

  FIGS. 13A and 13B and FIGS. 14A to 14C show the output shaft 22. The output shaft 22 has a large-diameter portion 22d that extends radially outward from the shaft portion 22c and is integrally formed at a substantially central portion in the axial direction. A pinion gear 41g for connecting to the seat lifter portion 41 is coaxially formed at the tip of the shaft portion 22c.

  A plurality of (for example, six) flat cam surfaces 22a are formed on the outer peripheral surface of the large-diameter portion 22d at equal intervals in the circumferential direction, and a wedge clearance 26 provided between the inner peripheral surface 23b of the brake-side outer ring 23 and the like. Two cylindrical rollers 27 and a leaf spring 28 are arranged on each (see FIG. 5). An annular recess 22b in which the friction ring 29 is accommodated is formed on one end face of the large diameter portion 22d. Reference numeral 22f in the figure is a protrusion formed on the other end face of the large-diameter portion 22d, and is inserted into the hole 15d of the inner ring 15 with a clearance (see FIGS. 1 and 8A and 8B).

  FIGS. 15A and 15B and FIGS. 16A and 16B show the brake-side outer ring 23 and its cover 24. 17A and 17B show the brake side plate 25. FIG. The brake side outer ring 23 and the cover 24 are caulked and fixed integrally by the brake side plate 25. The brake-side outer ring 23 is a thick plate-like member obtained by punching one piece of material with a press, and the cover 24 is formed by pressing one piece of another material by pressing, as shown in FIGS. As shown in FIG. 1, there is an inclined portion 24 g extending outward in the radial direction in contact with the above-described enlarged diameter portion 15 c of the inner ring 15 (see FIG. 1). In the figure, reference numerals 24c and 25b denote holes through which the output shaft 22 is inserted, and reference numeral 25c denotes a hole into which a projection 29a of a friction ring 29 described later is fitted.

  A plurality (three) of cutout recesses 23a are formed on the outer periphery of the brake side outer ring 23, and a plurality (three) of cutout recesses 24a are also formed on the outer periphery of the cover 24 so as to correspond to the cutout recesses 23a. Is formed. As shown in FIGS. 21 (a) and 21 (b), the claw portion 25a of the brake side plate 25 is inserted into the notch recess 23a of the brake side outer ring 23, and at the notch recess 24a of the cover 24 as shown in FIG. The claw portion 25a of the brake side plate 25 is inserted.

The brake-side outer ring 23 and the cover 24 are connected and integrated together with the brake-side side plate 25 by crimping the claw portions 25a of the brake-side side plate 25 inserted into the notches 23a and 24a. Crimp claw portion 25a of the brake-side side plate 25, by utilizing crimping jig (not shown), it is carried out by expanding the bifurcated distal end portion 25a ₁ of the claw portion 25a to the outside (See FIG. 23).

  A wedge clearance 26 is formed between the inner peripheral surface 23b of the brake-side outer ring 23 and the cam surface 22a of the output shaft 22 (see FIG. 5). The cover 24 is formed with a claw portion 24b projecting in the axial direction, and the claw portion 24b is disposed between the two locking portions 18a of the inner centering spring 18 of the lever side clutch portion 11 [FIG. And FIG. 25 (a) (b)]. The claw part 24b of the cover 24 is formed by raising the outer diameter side of the claw part forming position. A claw portion 24 d that protrudes in the axial direction is formed on the outer periphery of the cover 24. The claw portion 24d is disposed between the two engaging portions 19a of the outer centering spring 19 of the lever side clutch portion 11 (see FIGS. 12A, 25A, and 25B).

  Two sets of locking portions 24e and 24f are formed on the outer periphery of the cover 24 by a stepped process (see FIGS. 25A and 25B). These locking portions 24e and 24f are in contact with a claw portion 14g that slides on the end surface of the brake side outer ring 23 in the rotation direction by the rotation of the lever side outer ring 14 with the cover 24 in contact with the end surface of the brake side outer ring 23. By enabling contact, it functions as a rotation stopper that regulates the operating angle of the operating lever. That is, when the lever side outer ring 14 is rotated by the operation of the operation lever, the claw portion 14g moves along the outer periphery of the cover 24 between the locking portions 24e and 24f of the cover 24.

  On the outer periphery of the brake side plate 25, one flange portion 25e and two flange portions 25f are provided as clutch attachment portions to the seat lifter portion (see FIGS. 2 to 4). At the tips of these three flange portions 25e and 25f, holes 25g and 25h for attachment to the seat lifter portion are bored so that the cylindrical portions 25i and 25j are axially bent so as to surround the attachment holes 25g and 25h. Projected.

  18A to 18C show a resin friction ring 29. A plurality of circular protrusions 29a are provided on the end face of the friction ring 29 at equal intervals along the circumferential direction thereof, and the protrusions 29a are press-fitted into the holes 25c of the brake side plate 25 to be fitted to the brake side. It is fixed to the side plate 25 (see FIGS. 1 and 3).

  When the protrusion 29a is press-fitted, the fitting state with the hole 25c is obtained by elastic deformation of the protrusion 29a by the resin material. By adopting the press-fitting structure of the protrusions 29a and the holes 25c in this way, the friction ring 29 can be prevented from dropping off from the brake side plate 25 during handling and the like, and handling characteristics during assembly are improved. Can be made.

  The friction ring 29 is press-fitted with an allowance to an inner peripheral surface 22e of an annular recess 22b formed in the large-diameter portion 22d of the output shaft 22 (see FIGS. 13A, 14A, and 14B). A rotational resistance is applied to the output shaft 22 by a frictional force generated between the outer peripheral surface 29 c of the friction ring 29 and the inner peripheral surface 22 e of the annular recess 22 b of the output shaft 22.

  On the outer peripheral surface 29c of the friction ring 29, a plurality of concave grooves 29b are formed at equal intervals in the circumferential direction (see FIG. 5). By providing the slit 29b in this manner, the friction ring 29 can be made elastic, so that the rate of change of the sliding torque with respect to the inner diameter tolerance of the output shaft 22 and the outer diameter tolerance of the friction ring 29 does not increase. .

  That is, the setting range of the rotational resistance provided by the frictional force generated between the outer peripheral surface 29c of the friction ring 29 and the inner peripheral surface 22e of the annular recess 22b of the output shaft 22 can be reduced, and the magnitude of the rotational resistance can be reduced. Can be set appropriately. Further, since the slit 29b becomes a grease reservoir, it is possible to suppress the outer peripheral surface 29c of the friction ring 29 from being worn by sliding with the inner peripheral surface 22e of the annular recess 22b of the output shaft 22.

  The friction ring 29 is made of a material that can maintain a tightening allowance with the output shaft 22. The material is preferably polybutylene terephthalate (PBT). In this way, by configuring the friction ring 29 with polybutylene terephthalate, it is possible to easily reduce the tightening allowance of the friction ring 29 with time. As a result, even when an excessive torque is applied to the output shaft 22, a predetermined rotational resistance is applied to the output shaft 22 when the brake-side clutch portion 12 is unlocked by a lever operation of the lever-side clutch portion 11. Therefore, it is possible to suppress the occurrence of a large vibration due to an increase in the surface pressure of the cylindrical roller 27. In addition, as a raw material of a friction ring, if it is a raw material which can maintain the interference with the output shaft 22, it may be other than the polybutylene terephthalate mentioned above.

  The inner peripheral surface 29d of the friction ring 29 has a circular shape concentric with the outer peripheral surface 29c (see FIGS. 5 and 18B and 18C). Thus, by making the inner peripheral surface 29d of the friction ring 29 circular, the rigidity of the friction ring 29 can be increased more than the conventional friction ring 129 (see FIG. 30), and the durability of the entire clutch unit is improved. Can be planned.

  As described above, the friction ring 29 is press-fitted to the inner peripheral surface 22e of the annular recess 22b formed in the large-diameter portion 22d of the output shaft 22 with a tightening margin, but the friction ring 29 is made of resin. There is a possibility that burrs may occur on the outer peripheral surface 29c of the friction ring 29 during the press-fitting.

  Therefore, as shown in FIG. 19, the chamfering angle θ of the chamfered portion 22 g formed at the peripheral edge of the annular recess 22 b of the output shaft 22 is set to 20 ° to 25 °. By defining the range of the chamfer angle θ in this way, when the friction ring 29 is press-fitted into the annular recess 22b of the output shaft 22, the friction ring 29 can be smoothly press-fitted into the annular recess 22b and burrs are generated. This can also be suppressed. If the chamfering angle θ is smaller than 20 °, burrs are likely to occur. If the chamfering angle θ is larger than 25 °, the press-fit load becomes large and press-fit becomes difficult.

  Furthermore, when the resin friction ring 29 is manufactured by the molding die 50, as shown in FIG. 20, the split position between one mold 50a and the other die 50b is set as the root portion of the protrusion 29a. By manufacturing the friction ring 29 with such a molding die 50, the portion of the friction ring 29 that is press-fitted into the annular recess 22b of the output shaft 22 becomes a portion that is molded with only one die 50b. Burrs are less likely to occur during press-fitting.

  The operation of the lever side clutch portion 11 and the brake side clutch 12 in the clutch unit X having the above configuration will be described.

  In the lever side clutch portion 11, when an input torque acts on the lever side outer ring 14, the cylindrical roller 16 engages with a wedge clearance 20 between the lever side outer ring 14 and the inner ring 15, and the inner ring 15 is engaged via the cylindrical roller 16. Torque is transmitted and the inner ring 15 rotates. At this time, an elastic force is accumulated in the centering springs 18 and 19 as the lever-side outer ring 14 and the cage 17 rotate. When the input torque is lost, the lever-side outer ring 14 and the cage 17 are returned to the neutral state by the elastic force of the centering springs 18 and 19, while the inner ring 15 maintains the given rotational position. Therefore, the inner ring 15 rotates in a jog by repeating the rotation of the lever side outer ring 14, that is, by the pumping operation of the operation lever.

  In the brake-side clutch portion 12, when reverse input torque is input to the output shaft 22, the cylindrical roller 27 engages with the wedge clearance 26 between the output shaft 22 and the brake-side outer ring 23, and the output shaft 22 becomes the brake-side outer ring. 23 is locked. Accordingly, the reverse input torque from the output shaft 22 is locked by the brake side clutch portion 12 and the return of the reverse input torque to the lever side clutch portion 11 is interrupted.

  On the other hand, the input torque from the lever-side outer ring 14 is input to the inner ring 15 via the lever-side clutch portion 11, and the inner ring 15 comes into contact with the cylindrical roller 27 and presses against the elastic force of the leaf spring 28. The cylindrical roller 27 is removed from the wedge clearance 26, the locked state of the output shaft 22 is released, and the output shaft 22 becomes rotatable. When the inner ring 15 further rotates, the clearance between the hole 15d of the inner ring 15 and the protrusion 22f of the output shaft 22 is clogged, and the inner ring 15 comes into contact with the protrusion 22f of the output shaft 22 in the rotation direction, so that the input torque from the inner ring 15 is increased. The output shaft 22 is transmitted to the output shaft 22 through the protrusion 22f, and the output shaft 22 rotates.

  The clutch unit X having the structure described in detail above is used by being incorporated in, for example, an automobile seat lifter. FIG. 26 shows a seat 40 installed in a passenger compartment of a car. The seat 40 includes a seat 40a and a backrest 40b, and includes a seat lifter 41 that adjusts the height H of the seat 40a. The height H of the seating seat 40a is adjusted by the operation lever 41a of the seat lifter 41.

FIG. 27A conceptually shows one structural example of the sheet lifter unit 41. Seat slide adjuster 41b of the slide moving member 41b ₁ to the link member 41c, one end of 41d are respectively rotatably hinged. The other ends of the link members 41c and 41d are pivotally attached to the seating seat 40a. The other end of the link member 41c is pivotally attached to the sector gear 41f via the link member 41e. Sector gear 41f is pivotally rotatably sitting seat 40a, a swingable fulcrum 41f ₁ around. The other end of the link member 41d is pivotally attached to the seating seat 40a.

  The clutch unit X of the above-described embodiment is fixed to an appropriate part of the seating seat 40a. The clutch unit X is fixed to the seating seat 40a by plastically deforming the three flange portions 25e and 25f of the brake side plate 25 so that the distal end portions of the cylindrical portions 25i and 25j are expanded outward. It is fixed by caulking to a seat frame (not shown) of the seat 40a.

  On the other hand, an operation lever 41a made of resin, for example, is coupled to the lever side plate 13 of the lever side clutch portion 11, and a pinion gear 41g that meshes with a sector gear 41f that is a rotating member is provided on the output shaft 22 of the brake side clutch portion 12. Yes. The pinion gear 41g is integrally formed at the tip of the shaft portion 22c of the output shaft 22 as shown in FIGS. 1, 13A, 13B, and 14A, 14B.

  In FIG. 27B, when the operation lever 41a is swung counterclockwise (upward), the input torque in that direction is transmitted to the pinion gear 41g via the clutch unit X, and the pinion gear 41g rotates counterclockwise. To do. Then, the sector gear 41f that meshes with the pinion gear 41g swings in the clockwise direction, and pulls the other end of the link member 41c through the link member 41e. As a result, both the link member 41c and the link member 41d stand up, and the seating surface of the seating seat 40a is raised.

  In this way, after adjusting the height H of the seating seat 40a, when the operation lever 41a is opened, the operation lever 41a is rotated clockwise by the elastic force of the two centering springs 18 and 19 to return to the original position ( Return to the neutral state. When the operation lever 41a is swung clockwise (downward), the seating surface of the seating seat 40a is lowered by the reverse operation. When the operation lever 41a is released after the height adjustment, the operation lever 41a rotates counterclockwise and returns to the original position (neutral state).

  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.

11 Lever side clutch part 12 Brake side clutch part 13 Input side member (lever side side plate)
14 Input side member (lever side outer ring)
15 Connecting member (inner ring)
16 Engagement element (cylindrical roller)
17 Cage 18 First elastic member (inner centering spring)
19 Second elastic member (outer centering spring)
22 Output side member (output shaft)
23 Static side member (brake side outer ring)
24 Static side member (cover)
25 Static side member (brake side plate)
26 Wedge clearance 27 Engagement element (cylindrical roller)
29 Friction ring

Claims (9)

Provided on the input side, lever side clutch part that controls transmission / cutoff of rotational torque to the output side by lever operation, and provided on the output side, and transmits input torque from the lever side clutch part to the output side It consists of a brake side clutch that cuts off the reverse input torque from the output side,
The brake-side clutch portion is provided on the output-side member from which torque is output, the stationary-side member whose rotation is restricted, and the stationary-side member, and is pressed between the output-side member and the output-side member. And a friction ring that imparts rotational resistance to the output side member by the generated frictional force, and the friction ring is made of a material that can maintain a tightening margin with the output side member.   The clutch unit according to claim 1, wherein the friction ring is made of polybutylene terephthalate.   The clutch unit according to claim 1 or 2, wherein the friction ring has a circular inner diameter.   The friction ring is press-fitted into an annular recess formed in the output side member, and a chamfering angle of a chamfered portion formed at a peripheral edge of the annular recess is 20 ° to 25 °. The clutch unit according to item.   The lever side clutch portion includes an input side member to which torque is input by lever operation, a connecting member that transmits torque from the input side member to the brake side clutch portion, and engagement between the input side member and the connecting member. A plurality of engagement elements that control transmission / cutoff of input torque from the input side member by detachment, a retainer that holds the engagement elements at predetermined intervals in the circumferential direction, and a stationary side member that is restricted in rotation, A first is provided between the cage and the stationary side member, accumulates an elastic force with an input torque from the input side member, and returns the cage to a neutral state with the accumulated elastic force by releasing the input torque. The elastic member is provided between the input side member and the stationary side member, and an elastic force is accumulated by an input torque from the input side member. By releasing the input torque, the input side member is moved by the accumulated elastic force. Return to neutral Clutch unit according to any one of claims 1-4 and a second elastic member.   The brake side clutch portion includes a connecting member to which torque from the lever side clutch portion is input, an output side member to which torque is output, a stationary side member in which rotation is restricted, and the stationary side member and the output side member. A plurality of pairs of engagement elements that are disposed in a wedge clearance between the members and control transmission of input torque from the connecting member and blocking of reverse input torque from the output side member by engagement / disengagement between the two members. The clutch unit according to any one of claims 1 to 4.   The clutch unit according to claim 5 or 6, wherein at least one of the engaging member of the lever side clutch portion or the engaging member of the brake side clutch portion is a cylindrical roller.   The clutch unit according to any one of claims 1 to 7, wherein the lever side clutch part and the brake side clutch part are incorporated in an automobile seat lifter part.   The clutch unit according to claim 8, wherein an input side member of the lever side clutch portion is coupled to an operation lever, and an output side member of the brake side clutch portion is connected to a link mechanism of an automobile seat lifter portion.

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