JP6901333B2 - 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).

As shown in FIG. 10, the clutch unit disclosed in Patent Document 1 transmits rotational torque from the lever-side clutch portion 111 to which rotational torque is input by lever operation and the lever-side clutch portion 111 to the output side. At the same time, it is provided with a brake side clutch portion 112 that shuts off the rotational torque from the output side.

The lever-side clutch portion 111 includes an outer ring 114 to which rotational torque is input by lever operation, an inner ring 115 that transmits rotational torque from the outer ring 114 to the brake-side clutch portion 112, and a wedge gap between the outer ring 114 and the inner ring 115. The main part is composed of a cylindrical roller 116 that controls transmission and disconnection of rotational torque from the outer ring 114 by engaging and disengaging.

The brake side clutch portion 112 includes an inner ring 115 to which the rotational torque from the lever side clutch portion 111 is input, an output shaft 122 to which the rotational torque from the inner ring 115 is output, a side plate 125 whose rotation is restricted, and an outer ring 123. Cylindrical roller 127 that controls the interruption of rotational torque from the output shaft 122 and the transmission of rotational torque from the lever-side clutch portion 111 by engaging and disengaging the cover 124 and the outer ring 123 and the output shaft 122 to the wedge gap. The main part is composed of and.

In the lever-side clutch portion 111, when a rotational torque is input to the outer ring 114 by lever operation, the cylindrical roller 116 engages with the wedge gap between the outer ring 114 and the inner ring 115. By engaging the cylindrical rollers 116 up to the wedge, rotational torque is transmitted to the inner ring 115 to rotate the inner ring 115.

In the brake side clutch portion 112, when the rotational torque is reversely input to the output shaft 122 due to seating on the seat, the cylindrical roller 127 engages with the wedge gap between the output shaft 122 and the outer ring 123, and the output shaft becomes the outer ring 123. Locked against. By locking the output shaft 122, the rotational torque that is reversely input from the output shaft 122 is cut off. As a result, the seat 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 portion 111 to the brake-side clutch portion 112, the inner ring 115 presses the cylindrical roller 127, so that the cylindrical roller 127 is a wedge between the outer ring 123 and the output shaft 122. Break away from the gap. By releasing the cylindrical roller 127, the locked state of the output shaft 122 is released, and the output shaft 122 becomes rotatable.

Then, as 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 rotating the output shaft 122, the seat height of the seat can be adjusted.

Japanese Unexamined Patent Publication No. 2011-169402

By the way, in the brake side clutch portion 112 of the conventional clutch unit disclosed in Patent Document 1, the side plate 125, the outer ring 123 and the cover 124 are clutched on the brake side by crimping and fixing the side plate 125 to the outer ring 123 and the cover 124. It is integrated as a stationary member of the portion 112.

The inner ring 115 and the output shaft 122 that rotate with respect to the stationary member are housed in the internal space formed by the side plate 125, the outer ring 123, and the cover 124. That is, the inner ring 115 that rotates by lever operation slides on the cover 124 in surface contact.

In this way, when the inner ring 115 that rotates by lever operation slides with respect to the cover 124 by surface contact, the contact of the inner ring 115 with respect to the cover 124 is metal-to-metal contact, and therefore slides according to the contact area. The resistance increases. As a result, the lever operation torque becomes large, which causes deterioration of the operation feeling.

Here, the inner ring 115 is formed with a hole 115e into which the protrusion 122f of the output shaft 122 is inserted and arranged. When the rotational torque is input to the inner ring 115, the protrusion 122f of the output shaft 122 comes into contact with the hole 115e of the inner ring 115, so that the rotational torque from the inner ring 115 is transmitted to the output shaft 122.

On the other hand, although the inner ring 115 is manufactured by press molding, burrs may occur on the fracture surface side (input side) of the peripheral edge portion of the hole 115e during the press molding. If there is such a burr, when the inner ring 115 that rotates by lever operation slides on the cover 124 in surface contact, the burr scratches the contact surface of the cover 124, and the sliding resistance increases. .. In this respect as well, the lever operation torque becomes large, which causes deterioration of the operation feeling.

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 improving an operation feeling.

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 output side clutch portion of the present invention is interposed between a stationary member whose rotation is constrained, an output member whose rotation is output, and the stationary member and the output member. A torque transmission member that slides in surface contact with the stationary member when the rotational torque is transmitted from the input side clutch portion to the output member is provided, and a non-contact portion is provided between both contact surfaces of the stationary member and the torque transmission member. It is characterized by that.

In the present invention, by providing the non-contact portion between the contact surfaces of the stationary member and the torque transmission member, the contact area between the stationary member and the torque transmission member can be reduced by the non-contact portion. As a result, it is possible to reduce the sliding resistance of the torque transmission member that slides with respect to the stationary member when the rotational torque is transmitted from the input side clutch portion to the output member.

When the torque transmission member of the present invention has a structure having a hole into which a protrusion of the output member is inserted, the non-contact portion of the present invention is a contact surface of the torque transmission member with a stationary member and is around the hole of the torque transmission member. It is desirable to have a structure having a concave portion formed in the portion, or a structure having a concave portion formed in a portion of the stationary member that is in contact with the torque transmission member and faces the portion around the hole of the torque transmission member.

If such a structure is adopted, even if there is a burr on the peripheral edge of the hole of the torque transmission member, when the torque transmission member slides with respect to the stationary member, the burr scratches the contact surface of the stationary member. Therefore, it is possible to prevent the sliding resistance from increasing.

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 portion is used as the lever side clutch portion to which the rotational torque is input by lever operation, and the output side clutch portion is used as the brake side clutch portion. The operation feeling during operation can be improved.

According to the present invention, by providing a non-contact portion between both contact surfaces of the stationary member and the torque transmission member, the contact area between the stationary member and the torque transmission member can be reduced by the non-contact portion. As a result, it is possible to reduce the sliding resistance of the torque transmission member that slides with respect to the stationary member when the rotational torque is transmitted from the input side clutch portion to the output member.

Due to this reduction in sliding resistance, when the clutch unit is incorporated into the seat lifter portion for automobiles, the operation feeling at the time of lever operation can be improved, and it is possible to provide a clutch unit that realizes comfortable lever operation for the user. ..

It is sectional drawing which shows the whole structure of 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 a block diagram which shows the seat seat and the seat lifter part of an automobile. It is a perspective view which looked at the inner ring of FIG. 1 from the input side. (A) is a cross-sectional view showing the inner ring of FIG. 5, and (B) is a right side view of (A). It is sectional drawing which shows the whole structure of the clutch unit in another embodiment of this invention. It is a perspective view which looked at the cover of FIG. 7 from the output side. (A) is a cross-sectional view showing the cover of FIG. 8, and (B) is a left side view of (A). It is sectional drawing which shows the whole structure of the conventional clutch unit.

An embodiment of the clutch unit according to the present invention will be described in detail with reference to the drawings. FIG. 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, and FIG. 3 is a cross-sectional view taken along the line QQ 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. Before explaining 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 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 which is a torque transmission member, a plurality of cylindrical rollers 16 which 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 in the circumferential direction. A cage 17 for holding the cage 17 at equal intervals, an inner centering spring 18 for returning the cage 17 to the neutral state, and an outer centering spring 19 for returning the outer ring 14 to the neutral state are provided.

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. 4) that can swing in the vertical direction and is attached to the side plate 13 by screwing or the like.

The inner ring 15 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) that protrude 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.

The inner centering spring 18 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 both ends thereof are part of the cage 17 and the cover 24. It is locked.

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

The outer centering spring 19 located on the radial outer side of the inner centering spring 18 is a C-shaped strip elastic member arranged between the outer ring 14 and the cover 24, and both ends thereof are one of the outer ring 14 and the cover 24. It is locked to the part.

When the rotational torque input from the outer ring 14 is applied by operating the lever, the outer centering spring 19 is expanded and expanded with respect to the cover 24 in a stationary state as the outer ring 14 rotates, and the outer ring 14 accumulates elastic force. When the rotational torque is released from the above, the outer ring 14 is returned to the neutral state by the elastic force.

The cage 17 is a resin-made cylindrical member in which a plurality of pockets 17a for accommodating the cylindrical rollers 16 are formed at equal intervals in the circumferential direction. The cage 17 is arranged between the outer ring 14 and the inner ring 15.

As shown in FIGS. 1 and 3, the brake side clutch portion 12 outputs the inner ring 15 which is a torque transmission member to which the rotational torque from the lever side clutch portion 11 is input, and the rotational torque from the inner ring 15. The rotation torque that is reversely input from the output shaft 22 due to the engagement and disengagement between the output shaft 22, which is an output member, 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. A plurality of pairs of cylindrical rollers 27 that control the interruption and transmission of rotational torque input from the inner ring 15, and a leaf spring 28 having an N-shaped cross section that urges each pair of cylindrical rollers 27 with a separation force in the circumferential direction. And a friction ring 29 that imparts rotational resistance to the output shaft 22, the main part is composed of.

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. 4) 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. A plate inserted between two cylindrical rollers 27 in a wedge clearance 26 (see FIG. 3) 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 roller 27 and the leaf spring 28 are arranged at equal intervals in the circumferential direction by the pillar portions 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. At this time, elastic force is accumulated in both centering springs 18 and 19 as the outer ring 14 and the cage 17 rotate.

When the input of the rotational torque by the lever operation is lost, the cage 17 and the outer ring 14 are returned to the neutral state by the elastic force of both the centering springs 18 and 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. 4).

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, the friction ring 29 imparts rotational resistance to the output shaft 22.

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. 4 shows a seat 40 installed in the passenger compartment of an automobile.

As shown in FIG. 4, 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 applying an appropriate rotational resistance to the output shaft 22 by the friction ring 29 (see FIG. 1).

By releasing the lock at the brake side clutch portion 12, the pinion gear 22d of the output shaft 22 of the brake side clutch portion 12 is rotated clockwise by the rotational torque transmitted from the lever side clutch portion 11 to the brake side clutch portion 12 (FIG. 4). Rotate in the direction of the arrow). Then, the sector gear 47 that meshes with the pinion gear 22d swings counterclockwise (in the direction of the arrow in FIG. 4), 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 overall configuration of the clutch unit 10 in this embodiment is as described above, but the inner ring 15 and the cover 24, which are characteristic configurations thereof, will be described in detail below.

As described above, the brake side clutch portion 12 of the clutch unit 10 is interposed between the cover 24 whose rotation is restricted, the output shaft 22 to which the rotation is output, and the cover 24 and the output shaft 22, and is located on the lever side. An inner ring 15 that slides in surface contact with the cover 24 when the rotational torque is transmitted from the clutch portion 11 to the output shaft 22 is provided.

As a characteristic configuration of this embodiment, as shown in FIG. 1, a recessed portion 15 g, which is a non-contact portion, is provided between both contact surfaces of the cover 24 and the inner ring 15. That is, as shown in FIGS. 5 and 6 (A) and 6 (B), an annular recessed portion 15 g is formed on the input side end surface of the enlarged diameter portion 15b, which is the contact surface with the cover 24 of the inner ring 15. The recessed portion 15g is formed by recessing the inner diameter side portion (the portion that does not overlap with the pillar portion 15c in the axial direction) of the input side end surface of the diameter expanding portion 15b toward the side plate 25 (brake side clutch portion 12). .. The recessed portion 15 g overlaps with the inner centering spring 18 when viewed from the axial direction. The recessed portion 15g is provided with a plurality of holes 15e into which the protrusions 22f of the output shaft 22 are inserted and arranged. As described above, the recessed portion 15g is formed around the hole 15e of the inner ring 15.

By forming the recessed portion 15g on the input side end surface of the enlarged diameter portion 15b of the inner ring 15 in this way, the contact area between the cover 24 and the inner ring 15 can be reduced by the recessed portion 15g. As a result, when the rotational torque is transmitted from the lever-side clutch portion 11 to the output shaft 22, the sliding resistance of the inner ring 15 rotating with respect to the cover 24 can be reduced.

Further, although the inner ring 15 is manufactured by press molding, burrs may occur on the fracture surface side (input side) of the peripheral edge portion of the hole 15e during the press molding. Even if there is such a burr, the formation of the recessed portion 15g prevents the burr from scratching the contact surface of the cover 15 when the inner ring 15 slides with respect to the cover 24, so that the sliding resistance is increased. It can be prevented from increasing.

By reducing and preventing the increase of the sliding resistance of the inner ring 15 with respect to the cover 24, the lever operation torque can be reduced in the clutch unit 10 incorporated in the automobile seat lifter portion 39, so that the operation feeling can be improved. It is possible to realize a comfortable lever operation for the user.

In the above embodiment, the structure in which the inner ring 15 is provided with the recessed portion 15 g has been illustrated, but as shown in FIG. 7, the cover 24 may be provided with the recessed portion 24b. In FIG. 7, the same parts as those in FIG. 1 are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIGS. 8 and 9 (A) and 9 (B), the clutch unit 10 of the embodiment shown in FIG. 7 has an annular recess 24b on the output side end surface of the cover 24 which is a contact surface with the inner ring 15. It has a formed structure. The recessed portion 24b is formed by recessing a portion of the output side end surface of the cover 24 that overlaps the inner centering spring 18 in the axial direction toward the side plate 13 (lever side clutch portion 11). The recessed portion 24b is formed at a portion facing a plurality of holes 15e provided in the enlarged diameter portion 15b of the inner ring 15.

By forming the recessed portion 24b on the output side end surface of the cover 24 in this way, the contact area between the cover 24 and the inner ring 15 can be reduced by the recessed portion 24b. As a result, when the rotational torque is transmitted from the lever-side clutch portion 11 to the output shaft 22, the sliding resistance of the inner ring 15 rotating with respect to the cover 24 can be reduced.

Further, even if there is a burr due to press molding on the peripheral edge of the hole 15e of the enlarged diameter portion 15b of the inner ring 15, when the inner ring 15 slides with respect to the cover 24 due to the formation of the recessed portion 24b, the burr is covered. Since it is possible to avoid scratching the contact surface of the 24, it is possible to prevent the sliding resistance from increasing.

By reducing and preventing the increase of the sliding resistance of the inner ring 15 with respect to the cover 24, the lever operation torque can be reduced in the clutch unit 10 incorporated in the automobile seat lifter portion 39, so that the operation feeling can be improved. It is possible to realize a comfortable lever operation for the user.

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)
15 Torque transmission member (inner ring)
15e hole 15g non-contact part (recessed part)
22 Output member (output shaft)
22f protrusion 24 stationary member (cover)
24b Non-contact part (recessed part)
39 Seat lifter

Claims (3)

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 output-side clutch portion is interposed between the stationary member whose rotation is restricted, the output member whose rotation is output, and the stationary member and the output member, and the input-side clutch portion is connected to the output member. A torque transmission member that slides in surface contact with the stationary member when the rotational torque is transmitted is provided.
A non-contact portion is provided between both contact surfaces of the stationary member and the torque transmission member .
The torque transmission member has a hole into which a protrusion of the output member is inserted, and the non-contact portion is a contact surface of the torque transmission member with the stationary member and is located at a portion around the hole of the torque transmission member. A clutch unit characterized by having a formed recessed portion. 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 output-side clutch portion is interposed between the stationary member whose rotation is restricted, the output member whose rotation is output, and the stationary member and the output member, and the input-side clutch portion is connected to the output member. A torque transmission member that slides in surface contact with the stationary member when the rotational torque is transmitted is provided.
A non-contact portion is provided between both contact surfaces of the stationary member and the torque transmission member .
The torque transmission member has a hole into which a protrusion of the output member is inserted, and the non-contact portion is a contact surface of the stationary member with the torque transmission member and a portion around the hole of the torque transmission member. A clutch unit characterized by having a recess formed in an opposing portion. The clutch unit according to claim 1 or 2, wherein the input side clutch portion and the output side clutch portion are incorporated in an automobile seat lifter portion.

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