JP2017057874A - Clutch unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of noise and vibration at a brake-side clutch part, and to improve an operation feeling.SOLUTION: A clutch unit is composed of a lever-side clutch part 11 which is arranged at an input side, and controls the transmission and block of rotation torque which is inputted by a lever operation, and a brake-side clutch part 12 which is arranged at an output side, and transmits the rotation torque inputted by the lever-side clutch part 11 to the output side and blocks the rotation torque reversely inputted by the input side. The brake-side clutch part 12 comprises a side plate 25 which is constricted in rotation, an output shaft 22 from which rotation is outputted, and a friction ring 39 which is attached and fixed to the side plate 25, and imparts rotation resistance to the output shaft 22 by slide torque which is generated by being pressure-inserted into the output shaft 22. A raw material of the friction ring 39 is a glass-fiber reinforced polyphenylene sulfide resin.SELECTED DRAWING: Figure 1

Description

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

  In general, in a clutch unit using an engagement element such as a cylindrical roller or a ball, a clutch portion is disposed between an input member and an output member. The clutch portion is configured to control transmission and interruption of rotational torque by engaging and disengaging an engaging member such as a cylindrical roller or a ball between the input member and the output member.

  The present applicant has previously proposed a clutch unit incorporated in an automobile seat lifter that adjusts the seat seat up and down by lever operation (see, for example, Patent Document 1). The clutch unit disclosed in Patent Document 1 transmits a rotational torque from the lever side clutch portion to which the rotational torque is input by lever operation, and the rotational torque from the lever side clutch portion to the output side, and the rotational torque from the output side. And a brake-side clutch portion that shuts off.

  The lever side clutch part is engaged with the outer ring to which rotational torque is input by lever operation, the inner ring that transmits the rotational torque input from the outer ring to the brake side clutch part, and the wedge clearance between the outer ring and the inner ring. And a plurality of cylindrical rollers that control transmission and interruption of rotational torque from the outer ring by separation, a cage that holds the cylindrical rollers at equal intervals in the circumferential direction, and elastic torque is accumulated by rotational torque from the outer ring, and rotational torque When there is no input, the main part is composed of two centering springs that return the cage and the outer ring to the neutral state by the accumulated elastic force.

  The brake-side clutch unit includes a side plate, an outer ring and a cover whose rotation is restricted, a steel output shaft to which rotational torque is output, and an engagement and disengagement up to a wedge clearance between the outer ring and the output shaft. A plurality of pairs of cylindrical rollers that control the interruption of the rotation torque from the lever and the transmission of the rotation torque from the lever side clutch part, a leaf spring that urges a separation force between each pair of cylindrical rollers, and a rotation resistance on the output shaft The main part is composed of a resin-made friction ring that imparts the above.

  Note that the inner ring of the lever side clutch part has a function of transmitting rotational torque from the lever side clutch part to the brake side clutch part, and a pair of cylindrical rollers arranged between the outer ring and the output shaft in the circumferential direction, etc. And a function of holding at intervals.

  In the lever side clutch portion, when rotational torque is input to the outer ring by lever operation, the cylindrical roller engages with the wedge clearance between the outer ring and the inner ring. Due to the engagement of the cylindrical rollers up to the wedge clearance, rotational torque is transmitted to the inner ring, and the inner ring rotates. At this time, elastic force is accumulated in both centering springs as the outer ring and the cage rotate.

  When the rotational torque is no longer input, the cage and the outer ring return to the neutral state by the elastic force of both centering springs, while the inner ring maintains the given rotational position. Therefore, the inner ring rotates in a jog by repeating the rotation of the outer ring, that is, by the pumping operation of the operation lever.

  In the brake-side clutch, when rotational torque is reversely input to the output shaft by seating on the seat, the cylindrical roller engages with the wedge clearance between the output shaft and the outer ring, and the output shaft locks against the outer ring. Is done. In this manner, the rotational torque reversely input from the output shaft is locked by the brake side clutch portion and the return to the lever side clutch portion is blocked. Thereby, the seat seat cannot be adjusted up and down.

  On the other hand, when rotational torque is input to the inner ring from the lever side clutch, the inner ring rotates and abuts against the cylindrical roller and presses against the elastic force of the leaf spring, causing the cylindrical roller to move between the outer ring and the output shaft. Remove from the wedge clearance. When the cylindrical roller is detached from the wedge clearance, the locked state of the output shaft is released and the output shaft can be rotated. When the locked state is released, rotational resistance is applied to the output shaft by the friction ring.

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

JP 2011-169402 A

  By the way, in the brake side clutch part of the conventional clutch unit disclosed in Patent Document 1, the resin friction ring is fixed to the side plate and the friction ring is press-fitted into the annular recess of the steel output shaft with a margin. The structure is adopted.

  By adopting such a structure, when releasing the locked state of the output shaft in the brake side clutch, the output shaft slides against the press-fitting surface of the friction ring, so that an appropriate rotational resistance ( (Sliding torque) is applied. Thereby, the height of the seat can be adjusted without any sense of incongruity for the passenger when operating the lever.

  Here, the friction ring in the conventional clutch unit is made of polybutylene terephthalate resin (PBT + GF) reinforced with glass fiber (see Patent Document 1). This glass fiber reinforced polybutylene terephthalate resin (PBT + GF) is excellent in creep resistance, flexibility and durability, and is particularly suitable as a material for a friction ring among many materials. However, since the glass transition temperature of this glass fiber reinforced polybutylene terephthalate resin is around 50 ° C., when the clutch unit is used in a high temperature state where the interior of the automobile is, for example, 50 ° C. or more, a part of the friction ring Softens (stiffness decreases).

  As described above, when a part of the friction ring is softened, there is a possibility that abnormal noise and fine vibration may be generated by sliding of the output shaft with respect to the friction ring when the brake side clutch is unlocked. When such abnormal noise or slight vibration occurs in the brake side clutch portion, the operation feeling is deteriorated when the lever is operated to unlock the output shaft.

  Therefore, the present invention has been proposed in view of the above-described improvements, and the object of the present invention is to prevent abnormal noise and fine vibrations from being generated in the brake side clutch and to improve the operational feeling. It is to provide a clutch unit to obtain.

  The clutch unit according to the present invention is provided on the input side, and is provided on the output side with a lever side clutch portion that controls transmission and interruption of the rotational torque input by lever operation, and the rotational torque from the lever side clutch portion. A basic configuration including a brake-side clutch portion that transmits to the output side and blocks rotational torque that is reversely input from the output side is provided.

  As technical means for achieving the above-described object, the brake-side clutch portion of the present invention includes a stationary member whose rotation is constrained, an output member from which rotation is output, and a stationary member attached and fixed to the output member. And a braking member that imparts rotational resistance to the output member with a sliding torque generated by the press-fitting of the pressure, and the braking member is made of polyphenylene sulfide resin.

  In the present invention, since the material of the braking member is polyphenylene sulfide resin, the creep resistance, flexibility, and durability are equivalent to the material used in the conventional braking member, that is, the polybutylene terephthalate resin reinforced with glass fiber. Even when using the clutch unit in a high temperature state, it is possible to avoid softening a part of the braking member. Therefore, when the lock is released at the brake side clutch portion, it is possible to prevent the generation of abnormal noise or fine vibration due to the sliding of the output member with respect to the braking member, and the operation feeling during the lever operation can be improved.

  The braking member according to the present invention preferably has a structure made of glass fiber reinforced polyphenylene sulfide resin. In this way, if the polyphenylene sulfide resin is reinforced with glass fiber, durability and strength can be improved, and the material becomes more suitable for a braking member.

  In the present invention, it is desirable that the brake member has a ring shape, the output member has an annular recess, and the outer peripheral surface of the ring-shaped brake member is press-fitted into the inner peripheral surface of the annular recess of the output member. If such a configuration is adopted, a structure effective for using a polyphenylene sulfide resin as the material of the braking member is obtained.

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

  According to the present invention, by using a polyphenylene sulfide resin as a material for the braking member, it is possible to avoid softening of a part of the braking member even when the clutch unit is used in a high temperature state. Thereby, it is possible to prevent the generation of abnormal noise or fine vibration due to the sliding of the output member with respect to the braking member at the time of unlocking at the brake side clutch portion. As a result, it is possible to improve the operation feeling during lever operation, and to provide a clutch unit that realizes comfortable lever operation for the user.

In embodiment of this invention, it is sectional drawing which shows the whole structure of a clutch unit. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. FIG. 2 is an exploded perspective view showing a side plate, a friction ring, and an output shaft of FIG. 1. (A) is a front view which shows the friction ring of embodiment shown in FIG. 4, (B) is a side view of (A). It is a characteristic view which shows the relationship between temperature and compressive strength about (PBT + GF) and (PPS + GF). It is a block diagram which shows the seat seat and seat lifter part of a motor vehicle.

  An embodiment of a clutch unit according to the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional view showing the overall configuration of the clutch unit of this embodiment, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. Before describing the characteristic configuration of this embodiment, the overall configuration of the clutch unit will be described.

  As shown in FIG. 1, the clutch unit 10 of this embodiment has a structure in which a lever side clutch portion 11 provided on the input side and a brake side clutch portion 12 provided on the output side are unitized. The lever side clutch part 11 controls transmission and interruption of rotational torque input by lever operation. The brake-side clutch unit 12 has a reverse input blocking function for transmitting the rotational torque from the lever-side clutch unit 11 to the output side and blocking the rotational torque that is reversely input from the output side.

  As shown in FIGS. 1 and 2, the lever side clutch portion 11 is configured so that the side plate 13 and the outer ring 14 as input members to which rotational torque is input by lever operation, and the rotational torque input from the outer ring 14 are applied to the brake side clutch portion. 12, the inner ring 15 that transmits to the outer ring 14, the plurality of cylindrical rollers 16 that control the transmission and blocking of the rotational torque from the outer ring 14 by engagement and disengagement between the outer ring 14 and the inner ring 15, The cage 17 is held at equal intervals in the direction, an inner centering spring 18 for returning the cage 17 to a neutral state, and an outer centering spring 19 for returning the outer ring 14 to a neutral state.

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

  The inner ring 15 includes a cylindrical portion 15a through which the output shaft 22 is inserted, a diameter-enlarged portion 15b in which a brake side end portion of the cylindrical portion 15a extends radially outward, and an outer peripheral end of the diameter-enlarged portion 15b. It consists of a plurality of pillars 15c (see FIG. 3) protruding by bending the part in the axial direction. A wedge clearance 20 is formed between a cylindrical surface 15d formed on the outer periphery of the cylindrical portion 15a of the inner ring 15 and a cam surface 14b formed on the inner periphery of the outer ring 14, and the above-described cylindrical roller is formed in the wedge clearance 20. 16 are arranged at equal intervals in the circumferential direction by a cage 17.

  The inner centering spring 18 is a C-shaped elastic member having a circular cross section disposed between the retainer 17 and a cover 24 that is a stationary member of the brake side clutch portion 12. Both ends of the inner centering spring 18 are disposed on the retainer 17 and the cover 24. It is locked to a part of. The inner centering spring 18 is elastically expanded by the rotation of the cage 17 following the outer ring 14 with respect to the cover 24 in a stationary state when the rotational torque input from the outer ring 14 is applied by lever operation. When the rotational torque input from the outer ring 14 is released, the cage 17 is returned to the neutral state by the elastic force.

  The outer centering spring 19 positioned on the radially outer side of the inner centering spring 18 is a C-shaped strip elastic member disposed between the outer ring 14 and the above-described cover 24, and both ends thereof are arranged on the outer ring 14 and the cover 24. It is locked to a part of. The outer centering spring 19 is expanded with the rotation of the outer ring 14 with respect to the cover 24 in a stationary state when the rotational torque input from the outer ring 14 by the lever operation is applied, and an elastic force is accumulated. When the rotational torque input from is released, the outer ring 14 is returned to the neutral state by the elastic force.

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

  As shown in FIGS. 1 and 3, the brake-side clutch unit 12, which is called a lock type and has a reverse input blocking function, includes an inner ring 15 to which rotational torque from the lever-side clutch unit 11 is input, The output shaft 22 as an output member from which the rotational torque from the clutch portion 11 is output, the outer ring 23, the cover 24 and the side plate 25 as stationary members whose rotation is restricted, and between the outer ring 23 and the output shaft 22. By engaging and disengaging, a plurality of pairs of cylindrical rollers 27 that control the interruption of the rotational torque input from the output shaft 22 and the transmission of the rotational torque input from the inner ring 15, and a circular pair between the cylindrical rollers 27 of each pair The main part is composed of a leaf spring 28 having an N-shaped cross section that urges a separating force in the circumferential direction and a friction ring 39 as a braking member that imparts rotational resistance to the output shaft 22.

  The output shaft 22 is integrally formed with a large-diameter portion 22b that extends radially outward and expands in the axially central portion of the shaft portion 22a into which the tubular portion 15a of the inner ring 15 is extrapolated. A pinion gear 22d for connecting to the seat lifter portion is coaxially formed at the output side end portion of the shaft portion 22a. Further, the washer 31 is press-fitted into the input side end portion of the shaft portion 22a via the wave washer 30 to prevent the component parts of the lever side clutch portion 11 from coming off.

  A plurality (for example, six) of 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 leaf spring interposed between the two cylindrical rollers 27 and the cylindrical rollers 27 in a wedge clearance 26 provided between the cam surface 22e of the large diameter portion 22b and the cylindrical inner peripheral surface 23a of the outer ring 23. 28 are arranged.

  The cylindrical rollers 27 and the leaf springs 28 are arranged at equal intervals in the circumferential direction by column portions 15 c of the inner ring 15 having a function of transmitting the rotational torque input from the outer ring 14 to the output shaft 22. That is, the column 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 22 b of the output shaft 22 is provided with a protrusion 22 f for transmitting the rotational torque from the inner ring 15 to the output shaft 22. The protrusion 22f is inserted and disposed in a hole 15e formed in the enlarged diameter portion 15b of the inner ring 15 with a circumferential clearance.

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

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

  In the lever side clutch portion 11, when rotational torque is input to the outer ring 14 by lever operation, the cylindrical roller 16 engages with the wedge clearance 20 between the outer ring 14 and the inner ring 15. Due to the engagement of the cylindrical roller 16 in the wedge clearance 20, rotational torque is transmitted to the inner ring 15 and the inner ring 15 rotates. At this time, elastic force is accumulated in the centering springs 18 and 19 as the outer ring 14 and the cage 17 rotate.

  When the rotational torque is no longer input, the cage 17 and the outer ring 14 are returned to the neutral state by the elastic force of the centering springs 18 and 19. On the other hand, the inner ring 15 maintains the given rotational position as it is. Therefore, the inner ring 15 rotates in a jog by repeating the rotation of the outer ring 14, that is, by the pumping operation of the operation lever.

  In the brake-side clutch portion 12, the cylindrical roller 27 engages with the wedge clearance 26 between the output shaft 22 and the outer ring 23 even when rotational torque is reversely input to the output shaft 22 due to seating on the seat. 22 is locked to the outer ring 23. In this way, the rotational torque reversely input from the output shaft 22 is locked by the brake side clutch portion 12 and the return of the rotational torque reversely input to the lever side clutch portion 11 is blocked. Thereby, the seat seat cannot be adjusted up and down.

  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 inner ring 15 contacts the cylindrical roller 27 and presses the cylindrical roller 27 against the elastic force of the leaf spring 28. As a result, the cylindrical roller 27 is detached from the wedge clearance 26, and the locked state of the output shaft 22 is released by the separation of the cylindrical roller 27 from the wedge clearance 26, so that the output shaft 22 can rotate. When the locked state of the output shaft 22 is released, rotational friction is applied to the output shaft 22 by the friction ring 39.

  When the inner ring 15 further rotates, the clearance between the hole 15e of the enlarged diameter portion 15b of the inner ring 15 and the projection 22f of the large diameter portion 22b of the output shaft 22 is clogged, and the enlarged diameter portion 15b of the inner ring 15 becomes the projection 22f of the output shaft 22. Contact in the rotational direction. Thereby, the rotational torque from the lever side clutch part 11 is transmitted to the output shaft 22 via the protrusion 22f, and the output shaft 22 rotates. That is, when the inner ring 15 is jogged and rotated, the output shaft 22 is also jogged and rotated. Thereby, the vertical adjustment of the seat is possible.

  The overall configuration of the clutch unit 10 in this embodiment is as described above, and the friction ring 39 that is a characteristic configuration thereof will be described in detail below.

  As shown in FIGS. 4 and 5A and 5B, a circular protrusion is formed on the end face of the friction ring 39 that imparts rotational resistance to the output shaft 22 when the brake side clutch portion 12 is unlocked by lever operation. 39a are provided at a plurality of locations at equal intervals in the circumferential direction. The friction ring 39 is fixedly attached to the side plate 25 by fitting the protrusion 39 a into the hole 25 b of the side plate 25.

  The friction ring 39 is press-fitted to the inner peripheral surface 22g of the annular recess 22c formed in the large diameter portion 22b of the output shaft 22 with a tightening margin. When releasing the locked state of the output shaft 22 in the brake side clutch portion 12 by lever operation, the frictional force generated between the outer peripheral surface 39b of the friction ring 39 and the inner peripheral surface 22g of the annular recess 22c of the output shaft 22 When the inner peripheral surface 22g of the annular recess 22c of the output shaft 22 slides on the outer peripheral surface 39b of the friction ring 39, rotational resistance (sliding torque) is applied to the output shaft 22.

  In addition, the outer peripheral surface 39b of the friction ring 39 is divided into a plurality in the circumferential direction by forming a plurality of notches 39c at equal intervals in the circumferential direction. The friction ring 39 is made elastic by dividing the outer peripheral surface 39b of the friction ring 39 into a plurality of parts in the circumferential direction. By providing the friction ring 39 with elasticity, the rate of change in rotational torque with respect to the inner diameter tolerance of the output shaft 22 and the outer diameter tolerance of the friction ring 39 does not increase.

  That is, the setting range of the rotational resistance applied by the frictional force generated between the outer peripheral surface 39b of the friction ring 39 and the inner peripheral surface 22g of the annular recess 22c 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 notch 39c becomes a grease reservoir, it is possible to suppress wear due to sliding of the inner peripheral surface 22g of the annular recess 22c of the output shaft 22 with respect to the outer peripheral surface 39b of the friction ring 39.

  The friction ring 39 in this embodiment is a member made of polyphenylene sulfide resin (PPS + GF) reinforced with glass fiber and formed into a ring shape by injection molding or the like.

  As shown in FIG. 6, the glass fiber reinforced polyphenylene sulfide resin (PPS + GF) that is a material of the friction ring 39 has a characteristic that the glass transition temperature is around 100 ° C. On the other hand, the glass transition temperature of polybutylene terephthalate resin (PBT + GF) reinforced with glass fiber, which is the material of the friction ring used in the conventional clutch unit, is around 50 ° C. Here, the glass transition temperature means a temperature at the time of changing from a glassy cured state to a rubbery softened state (when compressive strength is reduced) when a resin which is a polymer substance is heated.

  Even when the clutch unit 10 is used in a high temperature state in which the interior of the automobile is, for example, 50 ° C. or more by using a glass fiber reinforced polyphenylene sulfide resin as the material of the friction ring 39 as in this embodiment. It is possible to avoid a part of the friction ring 39 from being softened. Therefore, when the brake side clutch portion 12 is unlocked, it is possible to prevent the generation of abnormal noise or fine vibration due to the sliding of the output shaft 22 with respect to the friction ring 39, and the operation feeling during lever operation can be improved. . Thereby, the height of the seat can be adjusted without any sense of incongruity for the passenger when operating the lever.

  Finally, an application example of the clutch unit 10 of this embodiment will be described. The clutch unit 10 having the structure described in detail above is used by being incorporated in an automobile seat lifter 41 that adjusts the height of a seat by lever operation. FIG. 7 shows a seat seat 40 installed in a passenger compartment of an automobile.

  As shown in FIG. 7, the seat 40 includes a seat 41 and a backrest 42, and the seat lifter 41 adjusts the height of the seat surface of the seat 41. The height of the seating seat 41 is adjusted by the operation lever 43 attached to the side plate 13 (see FIG. 1) of the lever side clutch portion 11 in the clutch unit 10.

  The sheet lifter 41 has the following structure. One end of each of the link members 45 and 46 is pivotally attached to the slide movable member 44 so as to be rotatable. The other ends of the link members 45 and 46 are pivotally attached to the seating seat 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 22 d of the output shaft 22 of the clutch unit 10.

  For example, when the seating surface of the seating seat 41 is lowered, the lever side clutch portion 11 is operated, that is, the operation lever 43 is swung downward to lock the brake side clutch portion 12 (see FIG. 1). Release the state. When the brake side clutch portion 12 is unlocked, the 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 39 (see FIG. 1).

  By releasing the lock at the brake side clutch portion 12, the pinion gear 22d of the output shaft 22 of the brake side clutch portion 12 is rotated clockwise (in FIG. 7) with the rotational torque transmitted from the lever side clutch portion 11 to the brake side clutch portion 12. It rotates in the direction of the arrow. Then, the sector gear 47 that meshes with the pinion gear 22d swings counterclockwise (in the direction of the arrow in FIG. 7), and both the link member 45 and the link member 46 are tilted to lower the seating surface of the seating seat 41.

  In this way, after adjusting the height of the seating surface of the seating seat 41, when the operation lever 43 is released, the operation lever 43 swings upward by the elastic force of the centering springs 18 and 19, and returns to its original position (neutral). Return to the state. When the operation lever 43 is swung upward, the seating surface of the seating seat 41 is raised by the reverse operation to that described above. When the operation lever 43 is released after the height of the seating seat 41 is adjusted, the operation lever 43 swings downward and returns to the original position (neutral state).

  The applicant of the present invention relates to a friction ring (conventional product) made of glass fiber-reinforced polybutylene terephthalate resin (PBT + GF) and a friction ring 39 (product of the present invention) made of glass fiber-reinforced polyphenylene sulfide resin (PPS + GF). A test was conducted to verify whether or not abnormal noise or micro-vibration was generated from the clutch unit 10 when the brake side clutch portion 12 was unlocked.

  In this verification test, the clutch unit incorporating the above-described two types of friction rings is attached to the seat lifter 41 of the automobile, and a speed of 60 kg is applied to the seat 41 (see the white arrow in FIG. 7). The seat surface of the seating seat 41 was adjusted in height by a lever operation of 45 deg / sec. A verification test was conducted on test temperatures of 25 ° C. and 60 ° C. for 10 conventional products and 10 products of the present invention.

  As a result, at the test temperature of 25 ° C., no abnormal noise or micro-vibration occurred at all for the 10 conventional products and all 10 products of the present invention. On the other hand, at the test temperature of 60 ° C., abnormal noise and fine vibration occurred in the eight conventional products, whereas abnormal noise and fine vibration did not occur in all ten of the present invention products. Therefore, in the product of the present invention, even when the clutch unit 10 is used at a high temperature, it is possible to prevent the generation of abnormal noise and fine vibration due to the friction ring 39 when the brake side clutch portion 12 is unlocked. It became.

  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.

10 Clutch unit 11 Lever side clutch part 12 Brake side clutch part 22 Output member (output shaft)
22c annular recess 22g inner peripheral surface 25 stationary member (side plate)
39 Braking member (friction ring)
39b Outer peripheral surface 41 Sheet lifter part

Claims (4)

Provided on the input side, a lever side clutch part that controls transmission and interruption of rotational torque input by lever operation, and provided on the output side, and transmits the rotational torque from the lever side clutch part to the output side, It consists of a brake side clutch part that cuts off rotational torque that is reversely input from the output side,
The brake side clutch portion is fixed to the stationary member whose rotation is restricted, an output member from which the rotation is output, and fixed to the stationary member, and rotates to the output member with a sliding torque generated by press-fitting into the output member. And a braking member for imparting resistance, wherein the braking member is made of polyphenylene sulfide resin.   The clutch unit according to claim 1, wherein the braking member is made of glass fiber reinforced polyphenylene sulfide resin.   3. The brake member according to claim 1, wherein the brake member has a ring shape, the output member has an annular recess, and the outer peripheral surface of the ring-shaped brake member is press-fitted into the inner peripheral surface of the annular recess of the output member. Clutch unit.   The clutch unit as described in any one of Claims 1-3 in which the said lever side clutch part and the said brake side clutch part are integrated in the seat lifter part for motor vehicles.

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