JP6873766B2 - Clutch unit - Google Patents

Description

The present invention includes an input side clutch portion to which a 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 cuts off the rotational torque from the output side. Regarding the clutch unit.

Generally, in a clutch unit using an engager such as a cylindrical roller or a ball, a clutch portion is arranged between an input member and an output member. This clutch portion is configured to control transmission and disconnection of rotational torque by engaging and disengaging an engaging element such as a cylindrical roller or a ball between the above-mentioned input member and output member.

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

The clutch unit disclosed in Patent Document 1 transmits rotational torque from the lever-side clutch portion as an input-side clutch portion to which rotational torque is input by lever operation and the lever-side clutch portion to the output side. It is provided with a brake side clutch part as an output side clutch part that shuts off rotational torque from the output side.

The lever side clutch part is from the outer ring where the rotational torque is input by lever operation, the inner ring which transmits the rotational torque from the outer ring to the brake side clutch part, and the outer ring by engaging and disengaging to the wedge gap between the outer ring and the inner ring. A plurality of cylindrical rollers that control the transmission and interruption of rotational torque, a cage that holds multiple cylindrical rollers at equal intervals in the circumferential direction, and an elastic force accumulated by the rotation of the outer ring, and when there is no input of rotational torque. , The outer centering spring that returns the outer ring to the neutral state by the accumulated elastic force, and the elastic force is accumulated by the rotation of the cage that follows the outer ring, and when the input of rotational torque is lost, the cage is accumulated by the accumulated elastic force. The main part is composed of an inner centering spring that returns the torque to the neutral state.

The clutch on the brake side shuts off the rotational torque from the output shaft and the lever side by engaging and disengaging the outer ring whose rotation is restricted, the output shaft from which the rotational torque is output, and the wedge gap between the outer ring and the output shaft. A plurality of cylindrical rollers and leaf springs that control the transmission of rotational torque from the clutch portion, a cage that holds each cylindrical roller and leaf spring at equal intervals in the circumferential direction, and a friction ring that imparts rotational resistance to the output shaft. The main part is composed of and. The cage is integrally formed with the inner ring of the lever-side clutch portion.

In the lever-side clutch portion, when a rotational torque is input to the outer ring by operating the lever, the cylindrical roller engages with the wedge gap between the outer ring and the inner ring. By engaging the cylindrical rollers up to the wedge, rotational torque is transmitted to the inner ring and the inner ring rotates. At this time, the elastic force is accumulated in the outer centering spring with the rotation of the outer ring, and the elastic force is accumulated in the inner centering plate with the rotation of the cage following the outer ring.

When the rotational torque is no longer input by operating the lever, the outer ring returns to the neutral state due to the elastic force of the outer centering spring, and the cage returns to the neutral state due to the elastic force of the inner centering spring. On the other hand, the inner ring maintains the given rotation position as it is. Therefore, the inner ring rotates by the repeated rotation of the outer ring, that is, the pumping operation of the operating lever.

In the brake side clutch, when the rotational torque is reversely input to the output shaft when seated 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 with respect to the outer ring. .. This lock on the output shaft cuts off the rotational torque that is input backward from the output shaft. As a result, the seat height of the seat is maintained.

On the other hand, when rotational torque is input to the cage of the clutch on the brake side from the inner ring of the clutch on the lever side, the cage rotates and comes into contact with the cylindrical roller to press against the elastic force of the leaf spring. The cylindrical roller separates from the wedge gap between the outer ring and the output shaft. By releasing the cylindrical roller, the locked state of the output shaft is released, and the output shaft becomes rotatable. When this locked state is released, a friction ring imparts rotational resistance to the output shaft.

Then, when the cage of the clutch portion on the brake side further rotates, the rotational torque from the cage is transmitted to the output shaft, and the output shaft rotates. That is, when the cage rotates by the inner ring of the clutch portion on the lever side, the output shaft also rotates by the cun. The seat height of the seat can be adjusted by the cun rotation of the output shaft.

Japanese Patent No. 5207779

By the way, the lever-side clutch portion of the conventional clutch unit disclosed in Patent Document 1 accumulates elastic force by the rotation of the outer ring, and when the input of rotational torque is lost, the outer ring returns to the neutral state by the accumulated elastic force. It is equipped with an outer centering spring that causes the cage to rotate, and an inner centering spring that accumulates elastic force by the rotation of the cage that follows the outer ring and returns the cage to the neutral state by the accumulated elastic force when the input of rotational torque is lost. There is.

The lever-side clutch portion of this clutch unit has a structure in which an inner centering spring is arranged on the outer circumference of the cage and an outer centering spring is arranged on the radial outer side of the inner center rig spring (see FIG. 23 of Patent Document 1). ). There are no interfering components between the inner centering spring and the outer centering spring.

In the lever-side clutch portion, when a rotational torque is input to the outer ring by lever operation, the outer centering spring that accumulates elastic force due to the rotation of the outer ring expands in diameter and swings. After that, when the lever is returned to the neutral position, the outer centering spring comes into contact with the inner centering spring due to the reaction. At this time, since there are no interfering parts between the inner centering spring and the outer centering spring, an abnormal noise may be generated due to the contact between the outer centering spring and the inner centering spring.

The generation of such an abnormal noise causes deterioration of the operation feeling when the lever is operated, and also causes discomfort to the passenger.

Therefore, the present invention has been proposed in view of the above-mentioned problems, and an object of the present invention is to provide a clutch unit capable of preventing generation of abnormal noise due to contact between an inner centering spring and an outer centering spring. To do.

In the clutch unit according to the present invention, the input side clutch portion that controls the transmission and disconnection of the input rotational torque and the rotational torque from the input side clutch portion are transmitted to the output side and are reversely input from the output side. It has a basic configuration including an output side clutch that shuts off rotational torque.

As a technical means for achieving the above-mentioned object, the input side clutch portion of the present invention returns the input member to which the rotational torque is input, the cage holding a plurality of engagers, and the input member to the neutral state. It is characterized in that it includes an outer centering spring for causing the cage to return to a neutral state and an inner centering spring for returning the cage to the neutral state, and the inner centering spring is housed inside the cage.

In the present invention, by storing the inner centering spring inside the cage, the outer centering spring that accumulates elastic force due to the rotation of the input member expands in diameter and swings, and then returns the lever to the neutral position. It is possible to avoid contact between the outer centering spring and the inner centering spring due to recoil. As a result, it is possible to prevent the generation of abnormal noise due to the contact between the outer centering spring and the inner centering spring.

The inner centering spring in the present invention preferably has a structure fitted in a concave groove formed on the inner peripheral surface of the cage.

If such a structure is adopted, the inner centering spring can be easily stored inside the cage by a simple means.

The cage in the present invention has an elongated hole or notch extending in the circumferential direction, and both ends of a C-shaped inner centering spring are locked to the circumferential end face of the elongated hole or notch of the cage. The structure is desirable.

If such a structure is adopted, the inner centering spring accumulates elastic force by the rotation of the cage following the input member, and when the input of rotational torque is lost, the accumulated elastic force returns the cage to the neutral state. The function of causing can be exerted by a simple means.

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

If such a structure is adopted, the input side clutch part is used as the lever side clutch part to which the rotational torque is input by lever operation, and the output side clutch part is used as the brake side clutch part, so that the seat lifter part for automobiles can be easily used. Can be applied.

According to the present invention, by storing the inner centering spring inside the cage, the outer centering spring that accumulates elastic force by the rotation of the input member expands in diameter and swings, and then returns the lever to the neutral position. It is possible to avoid contact between the outer centering spring and the inner centering spring due to the reaction. As a result, it is possible to prevent the generation of abnormal noise due to the contact between the outer centering spring and the inner centering spring.

By preventing the generation of abnormal noise in this way, when the present invention is applied to the seat lifter portion for automobiles, a good operation feeling can be obtained when the lever is operated, so that the lever operation that is comfortable for the passenger can be realized. Can be done.

It is sectional drawing which shows the clutch unit in embodiment of this invention. It is sectional drawing which follows the PP line of FIG. It is sectional drawing which follows the QQ line of FIG. It is sectional drawing which follows the RR line of FIG. It is a perspective view which shows the cage of the lever side clutch part of FIG. It is an assembly disassembled perspective view which shows the clutch unit of FIG. It is a perspective view which shows the state which assembled the cage of FIG. It is a perspective view which shows an example of the cage in another embodiment of this invention. It is a perspective view which shows the other example of the cage in another embodiment of this invention. It is a block diagram which shows the seat seat and the seat lifter part of an automobile.

An embodiment of the 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 PP of FIG. 1, FIG. 3 is a cross-sectional view taken along the line QQ of FIG. It is sectional drawing which follows the RR line of FIG.

In the following embodiment, the clutch unit incorporated in the automobile seat lifter portion is illustrated, but the clutch unit can be applied to other than the seat lifter portion.

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 portion 11 controls transmission and disconnection of rotational torque input by lever operation. The brake-side clutch portion 12 has a reverse input cutoff function that transmits the rotational torque from the lever-side clutch portion 11 to the output side and cuts off the rotational torque that is reversely input from the output side.

As shown in FIGS. 1 and 2, the lever-side clutch portion 11 transmits the rotational torque input from the outer ring 14 to the brake-side clutch portion 12 and the side plate 13 and the outer ring 14 to which the rotational torque is input by operating the lever. The inner ring 15, a plurality of cylindrical rollers 16 that control transmission and disconnection of rotational torque from the outer ring 14 by engaging and disengaging between the outer ring 14 and the inner ring 15, and each cylindrical roller 16 are held at equal intervals in the circumferential direction. It includes a cage 17, an outer centering spring 18 for returning the outer ring 14 to the neutral state, and an inner centering spring 19 for returning the cage 17 to the neutral state.

The side plate 13 and the outer ring 14 insert the claw portion 13a formed on the outer peripheral edge portion of the side plate 13 into the notch recess 14a formed on the outer peripheral edge portion of the outer ring 14 and crimp the side plate 13 to the outer ring 14. It is fixed to and integrated as an input member of the lever side clutch portion 11.

A plurality of cam surfaces 14b are formed on the inner circumference of the outer ring 14 at equal intervals in the circumferential direction. The rotational torque is input to the outer ring 14 by an operating lever 43 (see FIG. 10) that can swing in the vertical direction and is attached to the side plate 13 by screwing or the like.

The inner ring 15 has a tubular portion 15a through which the output shaft 22 is inserted, a diameter-expanded portion 15b in which the brake-side end portion of the tubular portion 15a extends radially outward, and an outer peripheral end of the diameter-expanded portion 15b. It is composed of a plurality of pillar portions 15c (see FIG. 3) protruding by bending the portion in one axial direction (brake side clutch portion 12 side).

A wedge clearance 20 (see FIG. 2) is formed between the cylindrical outer peripheral surface 15d of the tubular portion 15a of the inner ring 15 and the cam surface 14b formed on the inner circumference of the outer ring 14. Cylindrical rollers 16 are arranged in the wedge clearance 20 by a cage 17 at equal intervals in the circumferential direction.

As shown in FIGS. 1 and 4, the outer centering spring 18 is a C-shaped strip elastic member arranged between the outer ring 14 and the cover 24, and has both ends 18a bent outward. It is locked to the claw portion 14c of the outer ring 14 and the claw portion 24b of the cover 24.

The outer centering spring 18 is expanded by the claw portion 14c as the outer ring 14 rotates with respect to the claw portion 24b of the cover 24 in a stationary state when the rotational torque input from the outer ring 14 by lever operation acts. The elastic force is accumulated, and when the rotational torque from the outer ring 14 is released, the elastic force returns the outer ring 14 to the neutral state.

The inner centering spring 19 located inside the outer centering spring 18 in the radial direction is a C-shaped elastic member having a circular cross section arranged between the cage 17 and the cover 24 of the brake side clutch portion 12, and is directed outward. Both ends 19a bent and molded are locked to the circumferential end surface 17c of the elongated hole 17b (described later) of the cage 17 and the claw portion 24c of the cover 24.

The inner centering spring 19 has a long hole as the cage 17 following the outer ring 14 rotates with respect to the claw portion 24c of the cover 24 in a stationary state when the rotational torque input from the outer ring 14 by lever operation acts. Elastic force is accumulated by being compressed by the circumferential end surface 17c of 17b, and when the rotational torque from the outer ring 14 is released, the elastic force returns the cage 17 to the neutral state.

As shown in FIG. 5, 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. A concave groove 17d extending along the circumferential direction is formed on the inner peripheral surface of the cage 17. The inner centering spring 19 is housed inside the cage 17 by fitting the above-mentioned inner centering spring 19 into the concave groove 17d (see FIG. 4).

Further, an elongated hole 17b extending along the circumferential direction is provided so as to communicate with the concave groove 17d of the cage 17. Both ends 19a of the inner centering spring 19 are locked to the circumferential end surface 17c of the elongated hole 17b (see FIG. 4).

As shown in FIGS. 6 and 7, the cage 17 and the inner centering spring 19 are assembled in a state of being arranged inside the outer centering spring 18 on the cover 24 of the brake side clutch portion 12. In this state, both end portions 19a of the inner centering spring 19 are locked to the claw portions 24c of the cover 24 (see FIG. 7). In FIG. 7, the outer centering spring 18 is not shown.

In this embodiment, as shown in FIG. 5, a case where one elongated hole 17b is provided in the cage 17 is illustrated, but the present invention is not limited to this, as shown in FIGS. 8 and 9. It may be a cage 17 having a structure.

In the cage 17 shown in FIG. 8, two elongated holes 17e are provided, and both end portions 19a of the inner centering spring 19 are locked to the circumferential end faces 17f located on the outer sides in the circumferential direction of the respective elongated holes 17e. Good.

Further, in the cage 17 shown in FIG. 9, a notch 17g extending along the circumferential direction is provided, and both ends 19a of the inner centering spring 19 are locked to the circumferential end surface 17h of the notch 17g. Good.

As shown in FIGS. 1 and 3, the brake-side clutch portion 12 includes an inner ring 15 to which the rotational torque from the lever-side clutch portion 11 is input, and an output shaft 22 to which the rotational torque from the inner ring 15 is output. Due to the engagement and disengagement between 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, the rotation torque reversely input from the output shaft 22 is cut off and the rotation torque from the inner ring 15 is cut off. A plurality of pairs of cylindrical rollers 27 for controlling transmission, a leaf spring 28 having an N-shaped cross section for urging each pair of cylindrical rollers 27 with a separation force in the circumferential direction, and a rotation resistance are applied to the output shaft 22. The main part is composed of the friction ring 29.

A large diameter portion 22b whose diameter is expanded outward in the radial direction is integrally formed on the shaft portion 22a of the output shaft 22 to which the tubular portion 15a of the inner ring 15 is extrapolated. A pinion gear 22d for connecting to the seat lifter portion 39 (see FIG. 10) is coaxially formed at the output side end portion of the shaft portion 22a. Further, by press-fitting the washer 31 into the input side end of the shaft portion 22a via the wave washer 30, the component parts of the lever side clutch portion 11 are prevented from coming off.

A plurality of (for example, six) flat cam surfaces 22e are formed on the outer periphery of the large diameter portion 22b of the output shaft 22 at equal intervals in the circumferential direction. One plate inserted between the two cylindrical rollers 27 and the two cylindrical rollers 27 in the wedge clearance 26 formed between the cam surface 22e of the large diameter portion 22b and the cylindrical inner peripheral surface 23a of the outer ring 23. A spring 28 and a spring 28 are arranged respectively.

The cylindrical rollers 27 and the leaf springs 28 are arranged at equal intervals in the circumferential direction by the pillars 15c 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 pillar portion 15c of the inner ring 15 functions as a cage by accommodating the cylindrical roller 27 and the leaf spring 28 in the pocket 15f and holding them at equal intervals in the circumferential direction.

The large diameter portion 22b of the output shaft 22 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 arranged in the hole 15e formed in the enlarged diameter portion 15b of the inner ring 15 with a clearance in the circumferential direction.

The outer ring 23, the cover 24, and the side plate 25 are formed in the notch recess 23b formed in the outer peripheral edge portion of the outer ring 23, the notch recess 24a formed in the outer peripheral edge portion of the cover 24, and the outer peripheral edge portion of the side plate 25. By inserting and crimping the formed claw portion 25a, 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.

The friction ring 29 is, for example, a resin ring-shaped member, and is fixed to the side plate 25. The friction ring 29 is press-fitted into 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 allowance. Rotational resistance is imparted to the output shaft 22 when the lever is operated by the frictional force generated between the outer peripheral surface 29a of the friction ring 29 and the inner peripheral surface 22g of the annular recess 22c of the output shaft 22.

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

In the lever-side clutch portion 11, when a 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. By engaging the cylindrical rollers 16 in the wedge clearance 20, rotational torque is transmitted to the inner ring 15 to rotate the inner ring 15.

When the rotational torque input from the outer ring 14 by the lever operation is applied, the outer centering spring 18 is pushed and expanded by the claw portion 14c with respect to the claw portion 24b of the cover 24 in the stationary state as the outer ring 14 rotates. Elastic force is accumulated.

Further, during this lever operation, the inner centering spring 19 is pushed against the claw portion 24c of the cover 24 in a stationary state by the circumferential end surface 17c of the elongated hole 17b as the cage 17 following the outer ring 14 rotates. It is shrunk and elastic force is accumulated.

In this embodiment, the inner centering spring 19 is housed inside the cage 17 by fitting the inner centering spring 19 into the concave groove 17d on the inner peripheral surface of the cage 17.

As a result, the outer centering spring 18 that accumulates elastic force due to the rotation of the outer ring 14 expands in diameter, and even if a reaction occurs when the lever is returned to the neutral position thereafter, the outer centering spring 18 stays inside the cage 17. It is possible to avoid contact with the inner centering spring 19 located at. As a result, it is possible to prevent the generation of abnormal noise due to the contact between the outer centering spring 18 and the inner centering spring 19.

When the input of the rotational torque by the lever operation is lost, the outer ring 14 is returned to the neutral state by the elastic force of the outer centering spring 18, and the cage 17 is returned to the neutral state by the elastic force of the inner centering spring 19.

On the other hand, the inner ring 15 maintains the given rotation position as it is. Therefore, the inner ring 15 rotates by the repeated rotation of the outer ring 14, that is, by the pumping operation of the operating lever 43 (see FIG. 10).

In the brake side clutch portion 12, even if the rotational torque is reversely input to the output shaft 22 due to seating on the seat, the cylindrical roller 27 engages with the wedge clearance 26 between the output shaft 22 and the outer ring 23, and the output shaft 22 It is locked to the outer ring 23.

In this way, the rotational torque that is reversely input from the output shaft 22 is locked by the brake side clutch portion 12, and the recirculation of the rotational torque that is reversely input to the lever side clutch portion 11 is blocked. As a result, the seat height of the seat is maintained.

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

As a result, the cylindrical roller 27 is separated 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, a rotational resistance 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 protrusion 22f of the large diameter portion 22b of the output shaft 22 is closed, and the enlarged diameter portion 15b of the inner ring 15 becomes the protrusion 22f of the output shaft 22. Contact in the direction of rotation.

As a result, the rotational torque from the lever-side clutch portion 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 oscillates, the output shaft 22 also oscillates. As a result, the seat height of the seat can be adjusted.

The clutch unit 10 having the above structure is incorporated in and used in the automobile seat lifter portion 39 that adjusts the height of the seat 40 by lever operation. FIG. 10 shows a seat 40 installed in the passenger compartment of an automobile.

As shown in FIG. 10, the seat seat 40 is composed of a seating seat 41 and a backrest seat 42, and the height of the seating surface of the seating seat 41 is adjusted by the seat lifter portion 39. The height of the seating seat 41 is adjusted by the operating lever 43 attached to the side plate 13 (see FIG. 1) of the lever-side clutch portion 11 of the clutch unit 10.

The seat lifter portion 39 has the following structure. One ends of the link members 45 and 46 are rotatably pivotally attached to the slide movable member 44, respectively. The other ends of the link members 45 and 46 are rotatably pivotally attached to the seating seat 41, 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 22d of the output shaft 22 of the clutch unit 10.

For example, when lowering the seating surface of the seat 41, the lever is operated by the lever-side clutch portion 11, 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 seating surface of the seating seat 41 can be smoothly lowered by imparting 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 by the rotational torque transmitted from the lever side clutch portion 11 to the brake side clutch portion 12 (FIG. 10). Rotate in the direction of the arrow). The sector gear 47 that meshes with the pinion gear 22d swings counterclockwise (in the direction of the arrow in FIG. 10), and the link member 45 and the link member 46 both tilt to lower the seating surface of the seat 41.

After adjusting the height of the seating surface of the seat 41 in this way, when the operating lever 43 is opened, the operating lever 43 swings upward due to the elastic forces of both centering springs 18 and 19 to the original position (neutral). Return to state).

When the operating lever 43 is swung upward, the seating surface of the seating seat 41 becomes higher in the reverse operation of the above. When the operating lever 43 is opened after adjusting the height of the seat 41, the operating lever 43 swings downward and returns to the original position (neutral state).

The present invention is not limited to the above-described embodiments, and it goes without saying that the present invention can be carried out in various forms without departing from the gist of the present invention. Indicated by the scope of the claim and further includes the equal meaning described in the claims, and all modifications within the scope.

10 Clutch unit 11 Input side clutch part (lever side clutch part)
12 Output side clutch part (brake side clutch part)
16 Engagement element (cylindrical roller)
17 Cage 17b, 17e Long hole 17c, 17f, 17h Circumferential end face 17d Concave groove 17g Notch 18 Outer centering spring 19 Inner centering spring 39 Seat lifter

Claims (5)

An input side clutch that controls the transmission and disconnection of the input rotational torque, and an output side clutch that transmits the rotational torque from the input side clutch to the output side and shuts off the reverse input rotational torque from the output side. It consists of a department
The input side clutch portion has elasticity acting between an input member to which rotational torque is input, a cage that holds a plurality of engagers, an outer centering spring that returns the input member to a neutral state, and a stationary member. and a inner centering spring for returning the retainer to a neutral state by force,
The inner centering spring is arranged inside the outer centering spring in the radial direction.
A clutch unit characterized in that the inner centering spring is housed inside the cage. The clutch unit according to claim 1, wherein the inner centering spring is fitted in a concave groove formed on an inner peripheral surface of the cage. The cage has an elongated hole extending in the circumferential direction, and both ends of the C-shaped inner centering spring are locked to the circumferential end surface of the elongated hole of the cage according to claim 1 or 2. The described clutch unit. The cage has a notch extending in the circumferential direction thereof, and both ends of the C-shaped inner centering spring are locked to the circumferential end surface of the notch of the cage according to claim 1 or 2. The described clutch unit. The clutch unit according to any one of claims 1 to 4, wherein the input side clutch portion and the output side clutch portion are incorporated in an automobile seat lifter portion.

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