JP2016064765A - Tilt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tilt device which can easily reduce an operation torque and has an excellent operability.SOLUTION: A tilt device is equipped with a reverse input blockage clutch 12 comprising: an input shaft 13 to which a rotational torque is input; an output shaft 14 from which a rotational torque is output; an outer ring 15 of which rotation is restricted and a side plate 16; plural cylindrical rollers 17 which control blockage of a rotational torque which is reversely input from the output shaft 14 and transmission of a rotational torque which is input from the input shaft 13 by engagement and disengagement between the outer ring 15 and the output shaft 14; and a holder 19 which holds the cylindrical rollers 17 between the outer ring 15 and the output shaft 14. The side plate 16 of the reverse input blockage clutch 12 is fixed to a tilt frame 3 which is displaceably attached to a seat frame 2, and the putout shaft 14 of the reverse input blockage clutch 12 is rotatably coupled to a gear plate 4 which is attached to the seat frame 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tilt device that is provided at a front portion of a seating seat portion of a seat and that allows the position of the front portion of the seating seat portion to be adjusted in the vertical direction.

  For example, a seat of an automobile or the like mainly includes a seating seat portion and a backrest seat portion that is tiltably attached to the seating seat portion. Some of these seats can adjust the position of the front part of the seating seat part that supports the thigh of the occupant in the vertical direction according to the physique and preference of the occupant. Various tilt devices have been proposed as the position of the front portion of the seating seat portion being adjustable in the vertical direction (see, for example, Patent Document 1).

  The tilt device disclosed in Patent Document 1 has a structure in which the position of the front portion of the seating seat portion is adjusted in the vertical direction by driving the gear mechanism by the rotational torque input from the operation handle. On the other hand, this tilting device is provided with a brake mechanism for interrupting rotational torque that is reversely input to the gear mechanism when a passenger sits on the seating seat portion.

  The brake mechanism of this tilting device has a torsion spring mounted in the case of the operation handle so as to be pressed against the inner wall of the case, and both ends of the torsion spring can be brought into contact with the handle shaft of the operation handle. The portion is arranged between both end portions of the torsion spring, and the pinion gear is inserted into one end of the handle shaft.

  In this brake mechanism, when the operation handle is operated, a part of the handle shaft comes into contact with one end of the torsion spring, and the outer diameter of the torsion spring is reduced by entraining it, so that the pressure contact with the inner wall of the case is reduced. It is released and the pinion gear rotates. By the rotation of the pinion gear, the position of the front portion of the seating seat portion can be adjusted in the vertical direction. On the other hand, if the occupant sits on the seating seat and rotational torque is reversely input to the pinion gear of the gear mechanism, the outer diameter of the torsion spring increases and the pressure contact force on the inner wall of the case increases, causing the pinion gear to rotate. do not do. As a result, the front part of the seating seat part is fixed.

JP 2001-301497 A

  By the way, in the tilting device disclosed in Patent Document 1, the torsion spring of the brake mechanism is used to block the rotational torque that is reversely input to the gear mechanism when the occupant sits on the seat. Since the torsion spring that exhibits the function of blocking the rotational torque that is reversely input to the gear mechanism is mounted so as to be in pressure contact with the inner wall of the case of the operation handle, it has a high frictional resistance. As described above, when the rubbing resistance of the torsion spring is large, the operation torque when operating the operation handle increases when the front portion of the seating seat portion is adjusted in the vertical direction. When this operation torque is large, it becomes difficult to operate the operation handle, resulting in a decrease in operability.

  Therefore, the present invention has been proposed in view of the above-described problems, and an object of the present invention is to provide a tilt device that can easily reduce the operation torque and is excellent in operability.

  As technical means for achieving the above-described object, the tilt device according to the present invention includes an input side member to which rotational torque is input, an output side member to which rotational torque is output, and a stationary side where rotation is constrained. A plurality of members that control the interruption of the rotational torque input from the output side member and the transmission of the rotational torque input from the input side member by engagement and disengagement between the member and the stationary side member and the output side member. And a reverse input cutoff clutch comprising a roller that holds the roller between the stationary side member and the output side member, and the stationary side member of the reverse input cutoff clutch is attached to the seat frame so as to be displaceable. In addition to being fixed to the tilt frame, the output side member of the reverse input cutoff clutch is rotatably coupled to a part of the seat frame.

  In the present invention, the rotational torque input from the input side member of the reverse input cutoff clutch is transmitted to the output side member released from the locked state by the separation of the roller, and the output side member is rotated. Since the output side member of the reverse input cutoff clutch is rotatably coupled to the seat frame, the reverse input cutoff clutch is attached to the seat frame fixedly arranged with the rotational torque of the output side member. The tilted frame can be displaced. On the other hand, with respect to rotational torque that is reversely input from the output side member of the reverse input cutoff clutch via the seat frame, the output side member is locked due to the engagement of the rollers between the output side member and the stationary side member. . Due to the locked state of the output side member, the tilt frame is fixed because the output side member does not rotate.

  As described above, since the locked state of the output side member and the release thereof are controlled by the engagement and disengagement of the roller between the output side member and the stationary side member, it is reversed by a spring such as a conventional torsion spring. The operating torque can be easily reduced and the operability can be improved as compared with the case where the input blocking function is exhibited. In addition, since the torque capacity can be increased by using the rollers, compared with the case where the reverse input blocking function is exhibited by the spring, the device can be made more compact.

  The present invention desirably has a structure in which a pinion gear is provided on the output side member of the reverse input cutoff clutch, and the pinion gear is engaged with the external teeth of the gear plate attached to the seat frame. With such a structure, it is possible to easily realize a structure in which the output side member of the reverse input cutoff clutch is rotatably coupled to the seat frame.

  According to the present invention, the locked state of the output side member and the release thereof are controlled by the engagement and disengagement of the roller between the output side member and the stationary side member. As a result, the operating torque can be reduced more easily and the operability can be improved than when the reverse input blocking function is exhibited. In addition, since the torque capacity can be increased by using the rollers, compared with the case where the reverse input blocking function is exhibited by the spring, the device can be made more compact. As a result, a compact tilt device with excellent operability can be provided.

In the embodiment of the present invention, it is a sectional view showing a tilt device in which a reverse input cutoff clutch is assembled to a tilt frame. It is an A direction arrow directional view of FIG. It is a figure showing a seat with a built-in tilt device. It is an assembly completion perspective view which shows the whole structure of a reverse input interruption | blocking clutch. It is an assembly exploded perspective view showing the whole reverse input interception clutch composition. It is sectional drawing which shows the whole structure of a reverse input interruption | blocking clutch. FIG. 7 is a right side view of FIG. 6 (including a part omitted). FIG. 7 is a left side view of FIG. 6.

  For example, as shown in FIG. 3, the seat 1 mounted in an automobile or the like includes a seating seat portion 1a and a backrest seat portion 1b attached to the seating seat portion 1a so as to be tiltable. The seat 1 is equipped with a tilt device that adjusts the position of the front part of the seating seat 1a that supports the thigh of the passenger in the vertical direction according to the physique and preferences of the passenger. This type of tilt device includes, for example, a structure in which a tilt frame 3 constituting a front portion of the seating seat portion 1a is rotatably attached to a seat frame 2 constituting the seating seat portion 1a.

  As shown in FIGS. 1 and 2, the tilt device of this embodiment is configured so that the output shaft 14 of the reverse input cutoff clutch 12 attached to the front end side of the tilt frame 3 is part of the seat frame 2, that is, the seat frame. 2 has a structure that is rotatably coupled to a gear plate 4 attached to the tip of the two. A pinion gear 28 is formed on the output shaft 14 of the reverse input cutoff clutch 12, and an external tooth 5 is formed on the gear plate 4 of the seat frame 2 to mesh with the pinion gear 28 of the output shaft 14 of the reverse input cutoff clutch 12. Yes. The base end portion of the tilt frame 3 is rotatably attached to the seat frame 2 by hinge pin bolts 6 and nuts 7.

  The reverse input cutoff clutch 12 is a type called a lock type, and as shown in FIGS. 4 to 8, an input shaft 13 as an input side member to which rotational torque is input, and an output side from which rotational torque is output. The output shaft 14 as a member, the outer ring 15 and the side plate 16 as stationary side members whose rotations are restricted, and the engagement and disengagement between the outer ring 15 and the output shaft 14 cause reverse input from the output shaft 14. A plurality of pairs of cylindrical rollers 17 that control the interruption of the rotational torque and the transmission of the rotational torque input from the input shaft 13, and an elastic member that urges each pair of cylindrical rollers 17 in the circumferential direction. The coil spring 18 and the retainer 19 that holds the cylindrical rollers 17 between the outer ring 15 and the output shaft 14 constitute a main part. The side plate 16 is an attachment member for assembling the reverse input cutoff clutch 12 to the tilt frame 3.

  In this embodiment, the cylindrical roller 17 is employed as a means for controlling the interruption of the rotational torque from the output shaft 14 and the transmission of the rotational torque from the input shaft 13. It is also possible to use rollers. If the cylindrical roller 17 is used as in this embodiment, the rotational torque input reversely from the output shaft 14 can be smoothly interrupted, while the rotational torque input from the input shaft 13 can be transmitted smoothly. As a result, the operation of the reverse input cutoff clutch 12 can be stabilized. Further, although the coil spring 18 is used as the elastic member, other elastic members such as a leaf spring can be used in addition to the coil spring 18.

  The input shaft 13 has a male spline 20 extending in the axial direction on the outer peripheral surface thereof. A flange portion 21 for restricting the position of the retainer 19 press-fitted into the input shaft 13 is integrally formed at the output side end portion of the input shaft 13. A hexagonal convex portion 22 for transmitting rotational torque from the input shaft 13 to the output shaft 14 is integrally provided at the tip of the flange portion 21. At the tip of the hexagonal convex portion 22, a cylindrical convex portion 23 for integrally supporting the output shaft 14 with respect to the input shaft 13 is provided integrally. An annular groove 24 for mounting a retaining ring (not shown) for preventing the operation knob 8 (see FIG. 1) attached to the input side end portion from being removed is formed at a substantially central portion of the input shaft 13. Yes.

  The output shaft 14 is formed with a large-diameter recess 25 into which the flange portion 21 of the input shaft 13 is fitted at the input side end facing the input shaft 13. Further, on the back side of the large-diameter concave portion 25, a hexagonal concave portion 26 into which the hexagonal convex portion 22 of the input shaft 13 is fitted so as to transmit torque is formed. Further, on the back side of the hexagonal concave portion 26, a cylindrical concave portion 27 for axial alignment with which the columnar convex portion 23 of the input shaft 13 is fitted is formed. A pinion gear 28 for coupling with the external teeth 5 of the gear plate 4 (see FIG. 2) is formed coaxially at the output side end of the output shaft 14.

  Since the pinion gear 28 has six tooth portions, the convex portion 22 of the input shaft 13 and the concave portion 26 of the output shaft 14 are formed in a hexagonal shape, thereby improving the efficiency of torque transmission between the input and output shafts. . A plurality (for example, six) of flat cam surfaces 29 are formed at equal intervals in the circumferential direction on the outer peripheral surface of the input side end of the output shaft 14. The input side end of the output shaft 14 functions as an inner ring with respect to the outer ring 15.

  The cage 19 includes a cylindrical portion 30 that is press-fitted into the input shaft 13, and a column portion 31 that expands radially outward from the output-side end portion of the cylindrical portion 30, and further bends and extends to the axial output side. It consists of and. A female spline 32 extending in the axial direction is formed on the inner peripheral surface of the cylindrical portion 30. The column portion 31 holds a plurality of pairs (for example, six pairs) of cylindrical rollers 17 and coil springs 18 at equal intervals in the circumferential direction. That is, the two cylindrical rollers 17 forming each pair and the coil springs 18 inserted between the cylindrical rollers 17 are accommodated in the pockets 33 positioned between the column portions 31 in the circumferential direction, so that the circumferential direction and the like Held at intervals. In this embodiment, the number of pairs of cylindrical rollers 17 and coil springs 18 is six, but the number is arbitrary.

  The outer ring 15 has a cup shape, and has a cylindrical part 34 that is extrapolated to the cylindrical part 30 of the cage 19, and the diameter of the outer ring 15 is increased radially outward from the output side end of the cylindrical part 34, and is further bent. A large-diameter portion 35 that extends to the axial output side, and a flange portion 36 that extends outward in the radial direction by bending the output-side end portion of the large-diameter portion 35 are configured. A plurality of notch recesses 38 for fixing the side plate 16 are formed at equal intervals in the circumferential direction on the outer peripheral edge portion of the flange portion 36. The cylindrical portion 30 of the retainer 19 is slidable with respect to the cylindrical portion 34 of the outer ring 15.

  The large diameter portion 35 has an internal space in which the input side end portion of the output shaft 14, the column portion 31 of the retainer 19, the cylindrical roller 17, and the coil spring 18 are accommodated. A wedge clearance 37 is formed between the cylindrical inner peripheral surface of the large-diameter portion 35 and the cam surface 29 at the input side end of the output shaft 14, and the cylindrical roller 17 and the coil spring 18 are held in the wedge clearance 37 by the cage. Arranged in 19 pockets 33. The wedge clearance 37 is narrower from the pocket central portion where the coil spring 18 is disposed toward the pocket both sides where the two cylindrical rollers 17 are disposed.

  The side plate 16 has a disk shape and integrally includes a cylindrical portion 39 that protrudes toward the axial output side. The outer peripheral edge of the side plate 16 is provided with three flange portions 40 extending radially outward and six claw portions 42 bent toward the axial input side. An attachment hole 41 for the tilt frame 3 is formed in the flange portion 40. By providing the flange portion 40 at three places, the attachment state of the reverse input cutoff clutch 12 to the tilt frame 3 can be stabilized. In this embodiment, the number of the flange portions 40 is three, but the number is arbitrary.

  The claw portions 42 are integrated with the outer ring 15 as stationary members, and are formed at two locations between adjacent flange portions 40. The tubular portion 39 is extrapolated at the axial center of the output shaft 14, and the output shaft 14 is slidable with respect to the tubular portion 39. Each claw portion 42 has a bifurcated tip portion, is inserted into a corresponding notch recess 38 of the outer ring 15, and is crimped outwardly by a bifurcated tip portion protruding from the flange portion 36 of the outer ring 15. It has a function of fixing the side plate 16 to the outer ring 15. In this embodiment, the number of the claw portions 42 and the notch recesses 38 is six, but the number is arbitrary.

  The side plate 16 that abuts on the flange portion 36 of the outer ring 15 is formed with an annular bulging portion 43 that extends over the entire circumference thereof so as to protrude toward the column portion 31 of the cage 19. The bulging portion 43 can come into contact with the cylindrical roller 17 accommodated in the pocket 33 of the cage 19, and by restricting the axial movement of the cylindrical roller 17 in the pocket 33, Prevent axial backlash. Further, by restricting the position of the cylindrical roller 17 toward the input shaft 13, a contact area between the inner peripheral surface of the outer ring 15 and the cam surface 29 of the output shaft 14 is ensured.

  As shown in FIGS. 1 and 2, the reverse input cutoff clutch 12 having the above configuration is fixed to the tip of a tilt frame 3 that is rotatably attached to the tip of the seat frame 2. That is, in the state where the output shaft 14 of the reverse input cutoff clutch 12 is inserted into the clutch mounting hole 9 provided in the tilt frame 3 and the pinion gear 28 protrudes to the inside of the tilt frame 3, the three flange portions 40 of the side plate 16. The rivet 10 is used to fix the tilt frame 3 to the tilt frame 3.

  Note that the reverse input cutoff clutch 12 may be attached to the tilt frame 3 by screwing with bolts and nuts in addition to the rivets 10. The gear plate 4 that meshes with the pinion gear 28 of the output shaft 14 of the reverse input cut-off clutch 12 is fixed to the front end of the seat frame 2 that is disposed close to and parallel to the tilt frame 3. The external teeth 5 of the gear plate 4 mesh with the pinion gear 28 from the side of the output shaft 14 of the reverse input cutoff clutch 12.

  In the tilt device having the above-described configuration, when a load is applied to the seating seat portion 1a due to the passenger sitting on the seat seat 1, reverse input is performed via the seat frame 2 and the gear plate 4 of the seating seat portion 1a. The rotational torque is reversely input to the output shaft 14 of the cutoff clutch 12. Even if such rotational torque is reversely input, in the reverse input cutoff clutch 12, the coil spring 18 urges the cylindrical rollers 17 to separate each other in the circumferential direction. The output shaft 14 is locked to the outer ring 15 by engaging with a wedge clearance 37 between the outer ring 15 and the outer ring 15. Since the output shaft 14 does not rotate due to the locked state of the output shaft 14, the tilt frame 3 is fixed. In this way, the passenger's knee back can be reliably supported from below by the front portion of the seat 1a.

  On the other hand, in this tilt device, when the operating torque 8 disposed on the side portion of the seating seat portion 1a is rotated and the rotational torque is input to the input shaft 13 of the reverse input cutoff clutch 12, the input shaft 13 The cylindrical portion 17 of the retainer 19 press-fitted into the cylinder abuts against the cylindrical roller 17 and presses against the elastic force of the coil spring 18, so that the cylindrical roller 17 is detached from the wedge clearance 37 and the output shaft 14. The locked state is released. By releasing the locked state of the output shaft 14, rotational torque from the input shaft 13 is transmitted to the output shaft 14 via the hexagonal convex portion 22 of the input shaft 13 and the hexagonal concave portion 26 of the output shaft 14. 14 rotates.

  By the rotation of the output shaft 14, the pinion gear 28 that meshes with the external teeth 5 of the gear plate 4 fixed to the seat frame 2 moves on the external teeth 5 of the gear plate 4 while rotating. As a result, the tilt frame 3 to which the reverse input cutoff clutch 12 is attached rotates with respect to the seat frame 2 using the attachment location of the hinge pin bolt 6 and the nut 7 as a fulcrum. By the rotation of the tilt frame 3, the front portion of the seating seat portion 1a is displaced in the vertical direction. For example, if the operation knob 8 is rotated clockwise, the front portion of the seating seat portion 1a is displaced downward, and conversely, if the operation knob 8 is rotated counterclockwise, the front portion of the seating seat portion 1a. Is displaced upward. In this way, the front portion of the seating seat portion 1a can be smoothly displaced steplessly by the rotation of the output shaft 14 of the reverse input cutoff clutch 12. By this stepless displacement, comfort can be ensured by arranging the front portion of the seating seat portion 1a at an optimum position for the passenger.

  As described above, in the reverse input cutoff clutch 12 of the tilt device of this embodiment, the locked state of the output shaft 14 and the release thereof are controlled by the engagement and disengagement of the cylindrical roller 17 between the output shaft 14 and the outer ring 15. Therefore, the operation torque by the operation knob 8 can be reduced more easily than when the reverse input blocking function is exhibited by a spring such as a conventional torsion spring. That is, the passenger can easily operate the operation knob 8 with one hand, and the operability can be improved. Further, since the torque capacity can be increased by using the cylindrical roller 17 as compared with the case where the reverse input blocking function is exhibited by the spring, the tilt device can be easily made compact.

  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.

2 Seat frame 3 Tilt frame 4 Gear plate 5 External teeth 12 Reverse input blocking clutch 13 Input side member (input shaft)
14 Output side member (output shaft)
15 Static side member (outer ring)
16 Static side member (side plate)
17 Rollers (cylindrical rollers)
19 Cage 28 Pinion gear

Claims (2)

An input side member to which rotational torque is input, an output side member to which rotational torque is output, a stationary side member whose rotation is restricted, and engagement and disengagement between the stationary side member and the output side member A plurality of rollers for controlling the interruption of the rotational torque reversely input from the output side member and the transmission of the rotational torque input from the input side member, and the roller between the stationary side member and the output side member. It has a reverse input cutoff clutch consisting of a cage to hold,
The stationary side member of the reverse input cutoff clutch is fixed to a tilt frame that is detachably attached to the seat frame, and the output side member of the reverse input cutoff clutch is rotatably coupled to a part of the seat frame. A tilt device characterized by that.   The tilt device according to claim 1, wherein a pinion gear is provided on an output side member of the reverse input cutoff clutch, and the pinion gear is engaged with an external tooth of a gear plate attached to the seat frame.

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