JP2019202664A - Lifter device - Google Patents

Abstract

To enable operation when lowering a seat to be smoothly performed without deteriorating operability when lifting the seat, in a lifter device capable of adjusting a seat height according to an operation amount when an operation handle is operated to a seat lifting side or a lowering side, by imparting frictional resistance to a rotating shaft of a pinion gear only when lowering the seat and imparting no frictional resistance when lifting the seat to thereby cancel the rotational torque applied from the seat side when lowering the seat by the frictional resistance without increasing operation force when lifting the seat.SOLUTION: A lifter device includes wedge members 71 that are provided between a rotary member 26, which is rotated synchronously with a rotating shaft 22, and a support member 23, and generate frictional resistance in a rotation direction between the rotary member 26 and the support member 23 when the rotating shaft 22 is rotated. The wedge members 71 are configured not to generate the frictional resistance when the rotation of the rotating shaft 22 is in a direction for lifting a seat, and to generate the frictional resistance when the rotation of the rotating shaft 22 is in a direction for lowering the seat.SELECTED DRAWING: Figure 17

Description

  The present invention relates to a lifter device used for a seat of an automobile or the like.

  2. Description of the Related Art A lifter device used for a seat of an automobile or the like adjusts the height of a seat cushion with respect to a floor by operating an operation handle, and various types have been developed. In the invention of Patent Document 1, when the operation handle is operated to the seat ascending or descending side, the height is adjusted by an amount corresponding to the operation amount for each operation, and the operation handle is operated until the height desired by the seated person is reached. The operation is repeated.

  Specifically, the rotation control device is configured to rotate the pinion gear coupled to the link mechanism so as to raise or lower the seat by the operation of raising or lowering the seat of the operation handle. In the rotation control device, the rotation shaft of the pinion gear is provided with a rotation drive mechanism that rotates the pinion gear and a lock mechanism that locks the rotation of the pinion gear.

  When the operation handle is operated to the seat ascending or descending side, the pinion gear is rotationally driven so that the seat is raised or lowered by the rotation drive mechanism. When the lock mechanism is unlocked by receiving the operation force of the operation handle and stops receiving the operation force of the operation handle, the lock mechanism locks the rotation of the pinion gear at that position.

  When the operation handle is being operated and the lock mechanism is in the unlocked state, a rotational torque in the direction of lowering the seat from the seat side is applied to the rotation shaft of the pinion gear due to the weight of the seat and the weight of the occupant. Therefore, when operating the seat to the lower side, if the operating force of the operating handle is weak, the rotational torque from the seat side wins over the torque that rotationally drives the pinion gear by the rotational drive mechanism, and the lock mechanism rotates the pinion gear. Lock it. As a result, the lowering operation cannot be performed smoothly.

  In the invention of Patent Document 1, friction resistance is applied to the rotation shaft of the pinion gear by a disc spring, and the rotational torque from the seat side is canceled by the friction resistance.

JP-A-2006-78850

  However, the frictional resistance due to the disc spring is applied to the rotation shaft of the pinion gear even on the side where the seat is lifted, and the operating force of the operating handle required to operate the seat on the lift side increases. That is, when operating the seat to the ascending side, it is necessary to rotationally drive the pinion gear against the rotational force applied from the seat side due to the weight of the seat and the weight of the occupant. The problem is that the operating force of the operating handle is large.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lifter device that can adjust the height of a seat up or down according to the amount of operation when the operation handle is operated to the seat up side or down side. It is given only at times, and not given when the seat is raised. Thereby, without increasing the operating force when the seat is raised, the rotational torque applied from the seat side when the seat is lowered is offset by the frictional resistance. As a result, the operation when the seat is lowered can be smoothly performed without impairing the operability when the seat is raised.

  A lifter device according to a first aspect of the present invention includes a pinion gear that meshes with an input gear of a link mechanism that moves the seat up and down, and a rotation control device that controls the rotation of the pinion gear. The rotation control device is configured such that a rotating shaft that rotates in synchronization with the pinion gear, a support member that rotatably supports the rotating shaft, and an operation handle for moving the seat up and down raise or lower the seat. When operated, the rotary drive mechanism transmits the operating force of the operating handle to the rotating shaft and rotationally drives the rotating shaft in the ascending or descending direction, and the operating handle causes the seat to be raised or lowered. And a lock mechanism that allows the rotation of the rotation shaft and locks the rotation of the rotation shaft at the operation end position of the operation handle. Provided between the rotating shaft or the rotating member that rotates in synchronization with the rotating shaft and the supporting member, and when the rotating shaft rotates, the rotating direction between the rotating shaft or the rotating member and the supporting member A friction member that generates a frictional resistance of the rotation axis, and the frictional member does not generate the frictional resistance when the rotation direction of the rotation shaft is a direction that raises the sheet, and the rotation direction of the rotation shaft is a direction that lowers the sheet In this case, the frictional resistance is generated.

  According to the first aspect, the frictional resistance by the friction member is not applied to the rotation shaft of the pinion gear when the seat is raised, but is applied when the seat is lowered. For this reason, the rotational torque applied from the seat side when the seat is lowered can be offset by the frictional resistance without increasing the operating force when the seat is raised. As a result, the operation when the seat is lowered can be performed smoothly without impairing the operability when the seat is raised.

  According to a second aspect of the present invention, in the first aspect of the present invention, the friction member is a wedge member sandwiched between surfaces facing each other between the rotary shaft or the rotary member and the support member. The member has a wedge shape that spreads in the facing direction as it goes toward the rotating shaft or the rotating member in the sheet lowering direction.

  According to the second aspect of the present invention, the friction member is formed of the wedge member, and the increase in the number of parts associated with the addition of the friction member is suppressed. The applied rotational torque can be offset by frictional resistance.

  According to a third aspect of the present invention, in the second aspect, the support member has a container shape so that the rotation driving mechanism and the lock mechanism are accommodated therein, and the container shape includes the rotation shaft and the rotation shaft. An inner circumferential surface of a concentric circle is formed, and the rotating member is arranged in an inner circumferential surface of the support member with an outer circumferential surface facing the inner circumferential surface of the support member, and the wedge member is It is disposed between the inner peripheral surface of the support member and the outer peripheral surface of the rotating member.

  According to the third invention, the wedge member is disposed between the container-shaped inner peripheral surface of the support member and the outer peripheral surface of the rotating member. Therefore, the wedge member can generate a frictional resistance at a large diameter, and can increase the torque change of the rotating shaft due to the frictional resistance.

  According to a fourth aspect of the present invention, in the third aspect, the rotation driving mechanism contacts the wedge member when the rotation shaft rotates in the seat lowering direction, and the wedge member is sandwiched between the opposing surfaces. And a contact portion that presses the friction member against the outer peripheral surface of the rotating member from a state where the frictional resistance is increased toward a state where the frictional resistance is reduced.

  According to the fourth invention, the outer peripheral surface of the rotating member slides with respect to the wedge member, and the wedge member is sandwiched between the inner peripheral surface of the supporting member and the outer peripheral surface of the rotating member, When it becomes impossible to slide with respect to the peripheral surface, the contact portion of the rotation transmission mechanism contacts the wedge member, and the wedge member is moved to a state in which the wedge member can slide with respect to the inner peripheral surface of the support member. Therefore, even if the outer peripheral surface of the rotating member slides with respect to the wedge member, the wedge member is maintained in a slidable state with respect to the inner peripheral surface of the support member, and the sheet lowering operation can be performed normally. it can.

  According to a fifth aspect of the present invention, in the third aspect, the rotation drive mechanism includes a rotation transmission plate that is rotated in the ascending direction or the descending direction in response to an operation of the operation handle. The rotation transmission plate is configured to be engaged with the rotation transmission plate in the rotation direction and rotated by the rotation transmission plate, and when the rotation member rotates in the descending direction, the outer circumferential surface of the rotation member is The inclination angle of the portion of the wedge member that contacts the outer peripheral surface of the rotating member is smaller than the friction angle of the outer peripheral surface of the rotating member at the portion of the wedge member that contacts the outer peripheral surface of the rotating member, When the rotation transmission plate rotates in the descending direction, the rotation transmission plate abuts on the wedge member, and the wedge member is sandwiched between the opposed surfaces and is opposed to the outer circumferential surface of the rotation member. Comprising a contact portion for pressing the frictional resistance from the increased state to a state of reducing the frictional resistance.

  According to the fifth aspect, since the rotating member is rotated by the rotation transmission plate, the abutting portion that contacts the wedge member is rotated in synchronization with the rotating member when the seat is lowered. Therefore, when the seat is lowered, the relative position in the rotation direction between the contact portion and the rotation member does not change, and the wedge member is rotated together with the rotation member. As a result, the rotating member is given a frictional resistance between the wedge member and the inner peripheral surface of the support member when rotating in the seat lowering direction, and the rotational torque applied from the seat side when the seat is lowered is offset by the frictional resistance. can do.

  According to a sixth aspect of the present invention, in the third aspect of the invention, when the rotating member rotates in the descending direction, an inclination of a portion of the wedge member that contacts the outer peripheral surface of the rotating member with respect to the outer peripheral surface of the rotating member The angle is set to be larger than the friction angle of the outer peripheral surface of the rotating member at a portion that contacts the outer peripheral surface of the rotating member of the wedge member.

  According to the sixth invention, when the rotating member is rotated in the sheet lowering direction, the wedge member is pushed by the rotating member and moves. Therefore, the rotating member is given a frictional resistance between the wedge member and the inner peripheral surface of the support member when rotating in the sheet lowering direction, and the rotational torque applied from the sheet side when the sheet is lowered cancels out by the frictional resistance. be able to.

It is a side view of the sheet | seat to which the lifter apparatus which is 1st Embodiment of this invention is applied. It is a side view from the sheet | seat inner side of 1st Embodiment. It is a disassembled perspective view of the principal part of 1st Embodiment. It is the perspective view which looked at the rotation control device of a 1st embodiment from the sheet outside. It is the perspective view which looked at the rotation control device of a 1st embodiment from the sheet inside. It is a front view of the rotation control device of the first embodiment. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. FIG. 7 is a cross-sectional view taken along line VIII-VIII in FIG. 6. It is the disassembled perspective view which looked at the rotation control apparatus from the sheet | seat outer side. It is a disassembled perspective view which shows the assembly | attachment state between the one part components shown in FIG. It is a disassembled perspective view which shows the further assembly | attachment state between the one part components shown in FIG. It is a disassembled perspective view which shows the further assembly | attachment state between the one part components shown in FIG. It is the disassembled perspective view which looked at the rotation control apparatus from the sheet | seat inner side. It is a disassembled perspective view which shows the assembly | attachment state between some component parts shown in FIG. It is a disassembled perspective view which shows the further assembly | attachment state between the one part components shown in FIG. It is a state diagram of the feed function of the rotation control device when the operation handle is in the neutral position. It is a state figure of the friction function. It is a state diagram of the lock function. It is a state figure of a feed function when an operation handle is pushed down from a neutral position to a middle position. It is a state figure of the friction function. It is a state diagram of the lock function. It is a state figure of a feed function when an operation handle is pushed down from a neutral position to a full stroke position. It is a state figure of the friction function. It is a state diagram of the lock function. It is a state diagram of the feed function when the operation handle is returned from the push-down operation state to the neutral position. It is a state figure of the friction function. It is a state diagram of the lock function. It is a state figure of a feed function when an operation handle is pulled up from a neutral position to a middle position. It is a state figure of the friction function. It is a state diagram of the lock function. FIG. 6 is a state diagram in which the rotation of the pinion gear in the push-down operation direction is stopped by a stopper. FIG. 6 is a state diagram in which the rotation of the pinion gear in the pulling operation direction is stopped by a stopper. FIG. 18 is a state diagram corresponding to FIG. 17 of the second embodiment of the present invention.

<Overall configuration of the first embodiment>
1 to 3 show an automobile seat (hereinafter simply referred to as a seat) 1 to which a lifter device according to a first embodiment of the present invention is applied. In each figure, the direction of each part in the state which mounted the sheet | seat in the motor vehicle by the arrow is shown. In the following description, the description regarding the direction is made based on this direction.

  As shown in FIG. 1, the seat 1 is provided with a seat back 3 that forms a backrest at the rear portion of the seat cushion 2 that forms a seat, and the seat back 3 is rotatable in the front-rear direction with respect to the seat cushion 2. Yes. The seat cushion 2 includes a lifter device 10 and a seat slide device 8 at a lower portion, and is fixed to a vehicle floor 4 via a bracket 7.

  As shown in FIG. 2, the seat slide device 8 is a known device, and a pair of left and right upper rails 6 are coupled to a pair of left and right lower rails 5 extending in the front-rear direction so as to be slidable in the front-rear direction. The left and right lower rails 5 are fixedly supported by a pair of front and rear brackets 7 fixed to the floor 4. A lifter device 10 is provided on the left and right upper rails 6.

  As shown in FIGS. 2 and 3, the lifter device 10 includes a base member 14 fixed on each upper rail 6, and a plurality of link members 11 rotatably coupled to the front and rear end portions of each upper rail 6. A side frame 13 that is a skeleton member of the cushion 2, a base member 14, and each link member 11 constitute a link mechanism 12 that is a four-bar link. Of the plurality of link members 11, the rear link 11 b on the right rear side includes a sector gear (corresponding to the input gear of the present invention) 16 and is rotated in the front-rear direction by the pinion gear 18 of the rotation control device 21. It is configured as follows. The rotation axis of the right rear rear link 11b with respect to the side frame 13 is constituted by a torque rod 17, and the left rear rear link (not shown) is also synchronized with the rear link 11b via the torque rod 17. It is configured to rotate.

  The side frame 13 is provided with a through hole 13a for inserting the pinion gear 18, and the rotation control device 21 is fixed to the right side wall of the side frame 13 so that the pinion gear 18 is inserted into the through hole 13a. ing. The rotation control device 21 can be rotated in the forward and reverse directions by an operation handle 20 that extends in the front-rear direction on the right side portion of the seat cushion 2. When the operation handle 20 is rotated upward, the rotation control device 21 rotates the rear link 11b so as to rise from the base member 14, and when the operation handle 20 is rotated downward, the rotation control device 21 moves the rear link 11b. The base member 14 rotates so as to be bent down. With the configuration of the four-joint link described above, the front link 11a also rotates according to the rotation of the rear link 11b, and the height of the seat cushion 2 from the floor 4 is adjusted according to the operation of the operation handle 20.

<Configuration of rotation control device 21 (lock mechanism 30)>
4 to 6 show the rotation control device 21 removed from the seat cushion 2. Hereinafter, the configuration of the rotation control device 21 will be described with reference to FIGS.

  The rotation control device 21 is assembled such that the rotation shaft 22 passes through the center hole 23c of the support member 23 that is a base member, and the pinion gear 18 protrudes from the left side surface of the support member 23. The support member 23 is fixed to the side frame 13 with the pinion gear 18 passing through the through hole 13a (see FIGS. 2 and 3) of the side frame 13.

  The right side surface of the support member 23 is stamped and formed on the left side so as to accommodate the lock plate 31 of the lock mechanism 30 to form a guide recess 23b, and has a circular container shape as a whole. Inner teeth 34 that mesh with poles 32 and 33 described later are formed on the inner peripheral surface of the guide recess 23b. A spline hole 31 b is formed at the center of the lock plate 31 so as to mesh with the spline 22 b of the rotary shaft 22. Therefore, the lock plate 31 is rotated synchronously with the rotary shaft 22.

  On the outer peripheral portion of the right side surface of the lock plate 31, one protrusion 31 d is protruded and distributed in the vertical direction, and two protrusions 31 e are protruded and distributed in the front and rear. The protrusions 31e are fitted in the through holes 32a and 33a of the poles 32 and 33 so that the poles 32 and 33 can swing around the protrusions 31e. Further, each projection 31d is fitted with a winding portion 35a of a torsion spring 35, and each end portion 35b of the torsion spring 35 is engaged with each of the poles 32 and 33, and locks each of the poles 32 and 33. The plate 31 is biased toward the outer peripheral side. Therefore, the engaging end portions 32 c and 33 c of the respective poles 32 and 33 are always engaged with the internal teeth 34 of the support member 23.

<Configuration of Rotation Control Device 21 (Rotating Member 26 and Wedge Member 71)>
A rotation member 26 is provided on the right side surface of the lock plate 31. A spline hole 26 d is formed at the center of the rotating member 26, and the spline hole 26 d is configured to mesh with the spline 22 b of the rotating shaft 22. Therefore, the rotating member 26 is rotated synchronously with the rotating shaft 22 together with the lock plate 31.

  A circumscribed surface 26b that is formed to project in three directions on the outermost periphery of the rotating member 26 is disposed inside the inner peripheral surface 23d of the support member 23 in a state assembled to the support member 23 (see FIGS. 8 and 11). ). Further, between the respective circumscribed surfaces 26 b in the circumferential direction of the rotating member 26, a predetermined gap is provided between the rotating member 26 and the inner peripheral surface 23 d of the supporting member 23 in a state where the rotating member 26 is assembled to the supporting member 23. Opposing outer peripheral surfaces 26a are formed to protrude in three directions (see FIGS. 8 and 11).

  As shown in FIGS. 10 and 11, three wedge members (corresponding to the friction member of the present invention) 71 are sandwiched between the gaps between the outer peripheral surfaces 26 a of the rotating member 26 and the inner peripheral surface 23 d of the support member 23. Yes. The wedge member 71 has a wedge shape, and when the rotating member 26 rotates clockwise in FIG. 11 (corresponding to a direction in which the seat descends), each outer peripheral surface 26a of the rotating member 26 and the inner peripheral surface of the supporting member 23. When a wide region of the wedge member 71 is positioned in the gap with respect to the groove 23d and the rotating member 26 rotates counterclockwise in FIG. 11 (corresponding to a direction in which the seat rises), the outer peripheral surface 26a of the rotating member 26 is supported. The narrow region of the wedge member 71 is positioned in the gap with the inner peripheral surface 23d of the member 23. The number of wedge members 71 may be only one, but when three or more wedge members 71 are arranged evenly in the circumferential direction, there is an advantage that the frictional resistance described later is stabilized even when the rotation shaft 22 is inclined by an external force. The wedge member 71 is provided between the outer peripheral surface 26 a of the rotating member 26 and the inner peripheral surface 23 d of the support member 23, but is provided between the outer peripheral surface of the rotating shaft 22 and the inner peripheral surface of the support member 23. It is good also as a structure.

  A compression spring 72 is inserted and disposed between the wide end 71 b of each wedge member 71 and the member forming each circumscribed surface 26 b of the rotating member 26. Accordingly, each wedge member 71 is urged by the compression spring 72 so that the narrow region of the wedge member 71 is positioned in the gap between each outer peripheral surface 26 a of the rotating member 26 and the inner peripheral surface 23 d of the support member 23. Yes. Further, an engaging portion 71 a is formed at the narrow end portion of each wedge member 71 so as to protrude toward the inner peripheral side of the rotating member 26. Each engagement portion 71a is located at a position where projections (corresponding to contact portions of the present invention) 36a, 36f, which will be described later, contact with the rotation transmission plate 36 in the rotational direction, and the wedge member is brought into contact with the engagement portions 71a. 71 is moved against the urging force of the compression spring 72.

  As shown in FIG. 17, the angle α of the inclined surface of the wedge member 71 with respect to the contact point of each outer peripheral surface 26a of the rotating member 26 is smaller than the friction angle of each outer peripheral surface 26a on the inclined surface. Therefore, the friction resistance between the inner peripheral surface 23 d of the support member 23 and the outer peripheral surface of the wedge member 71 is larger than the friction resistance between each outer peripheral surface 26 a and the inclined surface of the wedge member 71 due to the rotation of the rotating member 26. The wedge member 71 is not interlocked with the rotation of the rotating member 26. Note that α is a value in the contact portion of the inclined surface of the wedge member 71 with respect to a straight line connecting the contact portion where the outer peripheral surface 26a of the rotating member 26 is in contact with the inclined surface of the wedge member 71 and the rotation center of the rotating shaft 22. The angle formed by the normal.

  On the right side surface of the rotating member 26, a protrusion 26c is formed so as to protrude up and down around the spline hole 26d. Each protrusion 26c is inserted into an engagement hole 36b of a rotation transmission plate 36, which will be described later, and the rotation of the rotation transmission plate 36 is delayed by an amount that the engagement hole 36b is formed longer in the rotation direction. To be communicated to.

<Configuration of Rotation Control Device 21 (Rotation Drive Mechanism 50)>
A plate-like input member 41 that is coupled to the operation handle 20 and is rotated is provided on the right side surface of the cover 24 formed in a container shape that swells to the right as a whole. A caulking end portion 25b of the caulking pin 25 is inserted into the center hole 41b of the input member 41 through the through hole 24e of the cover 24 and fixed thereto. The caulking pin 25 allows the cover 24 and the input member 41 to be slidable with respect to each other. Are combined. An engagement piece 42 is formed at the lower part of the input member 41 so as to bend to the left side. The engagement piece 42 is arranged on the inner peripheral side of the engagement piece 24 b formed to protrude to the right side of the cover 24. Has been placed. An end 43a of the torsion spring 43 is disposed so as to wrap around the engaging pieces 42 and 24b. Therefore, when the input member 41 is rotated by the operation handle 20, the engagement piece 42 moves away from the engagement piece 24b in the circumferential direction, but when the rotation operation is released, the torsion spring 43 Due to the urging force, the engagement piece 42 and the engagement piece 24b are positioned to overlap each other in the circumferential direction, and the input member 41 is returned to the position before the rotation operation.

  Further, a connecting member 53 is provided on the left side of the cover 24 so as to be accommodated in the container-like cover 24. The cover 24 is fixed to the support member 23 with the connecting member 53 interposed between the lock plate 31, the rotation member 26 and the rotation transmission plate 36. Specifically, the leg portion 24 d of the cover 24 is fixed to the through hole 23 a of the support member 23 with a rivet (not shown).

  The connecting member 53 includes arms 53 a extending to the right at the front and rear portions, and each arm 53 a passes through the opening 24 a of the cover 24 and penetrates the through hole 41 a of the input member 41. Therefore, the connecting member 53 can be rotated together with the input member 41. On the left side surface of the connecting member 53, a pair of feed claws 52 are swingably coupled by fitting the hinge portions 52 b of the feed claws 52 into the through holes 53 b of the connection member 53.

  A pair of release pieces 24f are integrally provided on the upper side of the cover 24 so as to be distributed in the front-rear direction. As shown in FIG. 15, the pair of release pieces 24 f are positioned so as to face the protrusions 52 d of the feed claws 52 in a state where the connecting member 53 and the feed claws 52 are assembled to the cover 24. .

<Configuration of rotation control device 21 (rotation transmission plate 36)>
A rotation transmission plate 36 is provided on the left side of the connection member 53, and the rotation transmission plate 36 is sandwiched between the connection member 53 and the rotation member 26. On the surface of the rotation transmission plate 36, a total of four protrusions 36a and 36e having a substantially square shape are formed so as to correspond to the poles 32 and 33, respectively. The pins 32b and 33b of the respective poles 32 and 33 are arranged to be engageable with the protrusions 36a and 36e. On the surface of the rotation transmission plate 36, two engagement holes 36b into which the protrusions 26c of the rotation member 26 are inserted are formed. Here, the protrusions 36a and 36e are formed so that the surfaces of the poles 32 and 33 facing the pins 32b and 33b are inclined. Thus, when the projections 36a and 36e contact the pins 32b and 33b of the poles 32 and 33, the engagement ends 32c and 33c of the poles 32 and 33 mesh with the internal teeth 34 of the support member 23. It is made to cancel from a state.

  Further, on the right side surface of the rotation transmission plate 36, torsion springs 37 and 54 are provided around the center hole 36d. The torsion spring 37 has its end 37a bent to the left and is inserted into the elongated hole 36c of the rotation transmitting plate 36, the elongated hole 26e of the rotating member 26 and the elongated hole 31c of the lock plate 31 so as to be engageable. The torsion spring 37 maintains the rotation angle of the rotation transmission plate 36 with respect to the lock plate 31 and the rotation member 26 at the neutral position by the biasing force. On the other hand, the end 54a of the torsion spring 54 abuts on the feed claws 52 and urges the feed claws 52 to the outer peripheral side. In addition, a projection 54 b that protrudes toward the right side is formed at the center of the torsion spring 54. The protrusion 54b is inserted into and engaged with an engagement hole 53c formed at the center of the lower end of the connecting member 53. Therefore, the feed claw 52 is always pressed by the end portion 54 a of the torsion spring 54, and the engagement end portion 52 a is engaged with the internal teeth 51 of the rotation transmission plate 36.

  11 and 15 show the state in which the input member 41 and the rotation drive mechanism 50 (the connecting member 53, the feed claw 52, the internal teeth 51 of the rotation transmission plate 36, the torsion spring 54) are assembled to the cover 24 as described above. Has been. 11 shows a state in which the lock plate 31, the poles 32 and 33, the rotating member 26 and the wedge member 71 are assembled on the support member 23, and FIG. 12 shows a state in which the rotation transmission plate 36 is further assembled. Has been. 11, 12, and 15 do not show the procedure for assembling the rotation control device 21, but the rotary shaft 22 is finally fitted into the fitting hole 25 a of the caulking pin 25, and the cover 24 is further supported by the support member 23. As a result, the rotation control device 21 is assembled. Grease is injected into the mechanism in the space closed by the cover 24 and the support member 23 for smooth operation of each part of the mechanism.

<Configuration of rotation control device 21 (stopper 60)>
An outer peripheral surface 22a is formed between the pinion gear 18 of the rotary shaft 22 and the spline 22b, and a rotary shaft-side protrusion 63 is formed to project in the radial direction at a specific angular position of the outer peripheral surface 22a. . In a state where the rotation shaft 22 is inserted into the center hole 23 c of the support member 23, the rotation shaft side protrusion 63 is positioned so as to be exposed on the right side surface of the guide recess 23 b of the support member 23.

  On the right side surface of the guide recess 23 b of the support member 23, an arcuate support member side protrusion 61 is formed by stamping. On the other hand, the lock plate 31 is stamped and formed around the spline hole 31b of the lock plate 31 so as to form a sliding surface portion 31a concentric with the spline hole 31b. When the lock plate 31 is rotated with respect to the support member 23, the outer periphery of the support member side protrusion 61 slides on the inner periphery of the sliding surface portion 31a. Further, the engaging piece 62 is arranged so as to slide in the gap between the inner periphery of the sliding surface portion 31 a and the outer peripheral surface 22 a of the rotating shaft 22.

  Therefore, when the rotation shaft 22 is rotated in the descending direction by the operation of the rotation control device 21 and reaches the lower limit position, the rotation shaft side protrusion 63 sandwiches the engagement piece 62 as shown in FIG. Abutting on the end of 61, the rotation of the rotary shaft 22 is stopped. When the rotary shaft 22 is rotated in the upward direction and reaches the upper limit position as shown in FIG. 32, the rotary shaft-side protrusion 63 sandwiches the engagement piece 62 and the opposite end of the support member-side protrusion 61. A further portion of the rotary shaft 22 is stopped. Thus, the stopper 60 is comprised by the support member side protrusion 61, the engagement piece 62, and the rotating shaft side protrusion 63. FIG.

  Hereinafter, based on FIGS. 16-30, the height adjustment effect | action of the seat cushion 2 by the rotation control apparatus 21 is demonstrated.

<Operation of the rotation control device 21 (the operation handle 20 is not operated)>
16 to 18 show a neutral position state in which the operation handle 20 is not operated and the input member 41 and the connecting member 53 are not rotated. At this time, as shown in FIG. 16, the feed claw 52 is in a state where the engagement end portion 52 a is engaged with the internal teeth 51 of the rotation transmission plate 36 by the urging of the torsion spring 54. Further, as shown in FIG. 17, since the rotating member 26 is not rotated, the wedge member 71 receives the biasing force of the compression spring 72 and receives the outer peripheral surface 26 a of the rotating member 26 and the inner peripheral surface 23 d of the support member 23. It is in a state sandwiched between. Further, as shown in FIG. 18, the pawls 32 and 33 of the lock mechanism 30 are brought into a state in which the engaging end portions 32 c and 33 c are engaged with the internal teeth 34 of the support member 23 by the urging of the torsion springs 35. ing. Therefore, the lock mechanism 30 is locked, the lock plate 31 is not rotated, and the height of the seat 1 is not changed to the ascending side or the descending side.

<Operation of the rotation control device 21 (the operation handle 20 is pushed down)>
19 to 21 show a state in which the operation handle 20 is pushed down from a neutral position to an intermediate position. At this time, as shown in FIG. 19, the connection member 53 is rotated in the arrow direction by the rotation of the input member 41. As a result, each feed claw 52 is moved in the same direction. Therefore, the engagement end portion 52a of the front feed claw 52 transmits a force to the internal teeth 51 of the rotation transmission plate 36, and rotates the rotation transmission plate 36 in the direction of the arrow. At this time, the engagement end portion 52 a of the rear feed claw 52 is not engaged with the internal teeth 51 of the rotation transmission plate 36. In other words, in this state, the teeth of the engagement end 52a are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 51. In addition, as the rotation transmission plate 36 rotates, the protrusion 52 d of the rear feed claw 52 rides on the release piece 24 f of the cover 24, and the engagement end 52 a is separated from the internal teeth 51.

  When the rotation transmission plate 36 is thus rotated, the protrusions 36a and 36f are in contact with the engaging portion 71a of the wedge member 71 as shown in FIG. Further, as shown in FIG. 21, the protrusion 36 e of the rotation transmission plate 36 engages with the pin 33 b of each pole 33, and the engagement end portion 33 c of each pole 33 is separated from the internal teeth 34 of the support member 23. . That is, the lock state of the lock plate 31 in the descending direction is released. Thereafter, when the protrusion 26 c of the rotation member 26 is engaged with the engagement hole 36 b, the rotation of the rotation transmission plate 36 can be transmitted to the rotation member 26 and the lock plate 31.

<Operation of the rotation control device 21 (full stroke operation of the operation handle 20)>
22 to 24 show a state where the operation handle 20 is pushed down from the neutral position to the full stroke position. The full stroke position is determined by the arm 53a of the connecting member 53 coming into contact with the circumferential end of the opening 24a of the cover 24 (see FIG. 22). At this time, as shown in FIG. 22, the rotation of the connecting member 53 and each feed claw 52 proceeds as compared with the state of FIG. 19, and the rotation angle of the rotation transmission plate 36 is increased by the front feed claw 52.

  When the rotation angle of the rotation transmission plate 36 increases in this manner, the rotation of the rotation transmission plate 36 is transmitted to the rotation member 26 and the lock plate 31 as shown in FIGS. Then, the rotating shaft 22 is rotated in synchronization as shown by the arrows. As a result, the pinion gear 18 is rotated and the seat cushion 2 is lowered. At this time, the rotation transmission plate 36 and the rotation member 26 are rotated in synchronization with the operation handle 20 by the engagement of the engagement hole 36b and the protrusion 26c. As a result, as shown in FIG. 23, the protrusions 36a and 36f of the rotation transmitting plate 36 and the outer peripheral surface 26a of the rotating member 26 move without changing the relative positions. Therefore, each wedge member 71 moves in a state where an appropriate frictional resistance is applied between the outer peripheral surface 26a and the inner peripheral surface 23d of the support member 23 while being pushed by the protrusions 36a and 36f. That is, when the rotating member 26 rotates, the outer peripheral surface 26 a tries to slide on the inclined surface of each wedge member 71. However, each wedge member 71 is moved by being pushed by the protrusions 36 a and 36 f so that the outer peripheral surface 26 a does not slide relative to the inclined surface of the wedge member 71. Therefore, the relative positions of the outer peripheral surfaces 26a of the rotating member 26 and the wedge members 71 do not change, and the rotating member 26 and the wedge member 71 slide on the inner peripheral surface 23d of the support member 23 as a unit. It will be. Therefore, the rotating member 26 rotates while receiving a frictional resistance between the wedge member 71 and the inner peripheral surface 23d of the support member 23.

  When the lock mechanism 30 releases the lock of the pinion gear 18 by the operation of pushing down the operation handle 20, a rotational torque is generated in the seat lowering direction of the pinion gear 18 due to gravity applied to the seat cushion 2, and this rotational torque is combined with the pinion gear 18. The lock plate 31 and the rotating member 26 are received. When this rotational torque exceeds the rotational torque of the connecting member 53 and the rotational transmission plate 36 by the operation of pushing down the operating handle 20, the rotational transmission plate 36 cannot disengage the pole 33 from the internal teeth 34, and the lock plate 31 and The rotation of the pinion gear 18 is locked. However, at this time, as described above, frictional resistance is imparted to the rotation of the rotating member 26, and the rotational torque in the seat lowering direction of the pinion gear 18 due to gravity applied to the seat cushion 2 is offset. Thus, the rotation of the pinion gear 18 is locked during the operation of lowering the seat 1 to prevent a problem that the smooth operation cannot be performed.

<Operation of the rotation control device 21 (when the operation handle 20 is depressed)>
25 to 27 show a state in which the operation of depressing the operation handle 20 is stopped and returned to the neutral position. At this time, the input member 41 is returned to the neutral position by the urging force of the torsion spring 43, and the connecting member 53 is also returned to the neutral position in synchronization. Therefore, the connecting member 53 is rotated as indicated by an arrow in FIG. Until the connecting member 53 is returned to the neutral position, the rear-side feed claw 52 is in a state where the protrusion 52d rides on the release piece 24f. When the connecting member 53 returns to the neutral position, as shown in FIG. 25, the rear feed claw 52 returns to a state where the engagement end portion 52 a meshes with the internal teeth 51 of the rotation transmission plate 36. On the other hand, in the front feed claw 52, the engaging end 52a slides on the inner teeth 51 of the rotation transmission plate 36 until the connecting member 53 is returned to the neutral position.

  When the push-down operation of the operation handle 20 is stopped, as described above, the rotation drive by the feed claw 52 to the rotation transmission plate 36 is released, so that the rotation transmission plate 36 is rotated by the urging force of the torsion spring 37. The lock plate 31 is returned to the initial position. Therefore, as shown in FIG. 26, the rotating member 26 and the wedge member 71 return to the neutral position similar to FIG. In addition, as shown in FIG. 27, each of the poles 32 and 33 is in a state where the engagement end portions 32c and 33c are engaged with the internal teeth 34 of the support member 23, and the lock plate 31 is locked at that position. Become. Accordingly, the pinion gear 18 also stops rotating, and the height of the seat cushion 2 is maintained at the position operated so far.

<Operation of the rotation control device 21 (pull-up operation of the operation handle 20)>
28 to 30 show a state where the operation handle 20 is pulled up from the neutral position to the middle position. At this time, as shown in FIG. 28, the connecting member 53 is rotated in the arrow direction by the rotation of the input member 41. As a result, each feed claw 52 is moved in the same direction. Therefore, the engagement end portion 52a of the rear feed claw 52 transmits a force to the internal teeth 51 of the rotation transmission plate 36, and rotates the rotation transmission plate 36 in the same direction. At this time, the engaging end 52a of the front feed claw 52 is not engaged with the internal teeth 51 of the rotation transmission plate 36. In other words, in this state, the teeth of the engagement end 52a are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 51. In addition, as the rotation transmission plate 36 rotates, the protrusion 52 d of the front feed claw 52 rides on the release piece 24 f of the cover 24, and the engagement end 52 a is separated from the internal teeth 51.

  When the rotation transmission plate 36 is thus rotated, the projections 36a and 36f are separated from the engaging portion 71a of the wedge member 71 as shown in FIG. When the operation handle 20 is further pulled up from this state, the outer peripheral surface 26 a of the rotating member 26 is moved to the narrow side of the wedge member 71, so that frictional resistance due to the wedge member 71 is not applied to the rotating member 26. Further, as shown in FIG. 30, the protrusions 36 a and 36 e of the rotation transmission plate 36 are engaged with the pins 32 b of the poles 32, and the engagement end portions 32 c of the poles 32 are separated from the internal teeth 34 of the support member 23. And That is, the lock state of the lock plate 31 in the upward direction is released. Thereafter, when the protrusion 26 c of the rotation member 26 is engaged with the engagement hole 36 b, the rotation of the rotation transmission plate 36 is transmitted to the lock plate 31. Therefore, the lock plate 31 rotates as shown by the phantom line arrow in FIG. As a result, the pinion gear 18 is rotated and the seat 1 is raised. At this time, the engagement end portion 33 c of each pole 33 is not engaged with the internal teeth 34 of the support member 23. That is, in this state, the teeth of the engagement end portion 33c are moved in the meshing release direction under the load in the normal direction of the teeth of the inner teeth 34. Therefore, when the lock plate 31 rotates, the engagement end portion 33 c of each pole 33 is slid on the inner teeth 34 of the support member 23.

<Operation of rotation control device 21 (summary)>
As described above, when the operation handle 20 is pushed down, the seat 1 is lowered by an amount corresponding to the operation. The sheet 1 can be adjusted to a desired height by repeating the pressing operation. At this time, a frictional resistance is applied by the wedge member 71 to the rotation of the rotary shaft 22 in the direction in which the seat 1 is lowered, and the rotational torque received by the rotary shaft 22 due to the gravity of the seat 1 is offset. On the contrary, when the operation handle 20 is pulled up, similarly, the seat 1 is raised by an amount corresponding to the operation. The sheet 1 can be adjusted to a desired height by repeating the pulling operation. When the sheet 1 is raised, the frictional resistance by the wedge member 71 is not given to the rotation of the rotating shaft 22.

  When the sheet 1 reaches the lower limit position or the upper limit position by the above operation, further rotation of the rotary shaft 22 is stopped as shown in FIG. 31 or FIG.

<Effect of the first embodiment>
According to the first embodiment, the frictional resistance due to the wedge member 71 is not applied to the rotating shaft 22 when the sheet 1 is raised, and is applied when the sheet 1 is lowered. Therefore, the rotational torque applied from the seat 1 side when the seat is lowered can be offset by the frictional resistance without increasing the operating force when the seat is raised. As a result, the operation when the seat is lowered can be performed smoothly without impairing the operability when the seat is raised.

Second Embodiment
FIG. 33 shows a second embodiment. The second embodiment is characterized in that the angle α of the inclined surface of the wedge member 71 with respect to the outer peripheral surface 26a of the rotating member 26 is larger than the friction angle of each outer peripheral surface 26a on the inclined surface. This is the point. In the second embodiment, the projection 36f provided in the first embodiment is not provided. At the same time, the shape of the protrusion 36a is changed. The other points are the same as in the first embodiment also in the second embodiment, and a repetitive description of the same part is omitted.

  Since the angle α of the inclined surface of the wedge member 71 with respect to the outer peripheral surface 26a of the rotating member 26 is larger than the friction angle of each outer peripheral surface 26a on the inclined surface, the rotating member 26 is rotated when the rotating member 26 is rotated by the sheet lowering operation. The outer peripheral surface 26 a does not slide on the inclined surface of the wedge member 71, but moves the wedge member 71 on the inner peripheral surface 23 d of the support member 23 in conjunction with the wedge member 71. Therefore, the wedge member 71 rotates together with the rotating member 26, and gives a frictional resistance between the wedge member 71 and the inner peripheral surface 23 d of the support member 23 against the rotation.

  In this way, the seat of the pinion gear 18 due to the gravity applied to the seat cushion 2 in order to provide the friction resistance between the wedge member 71 and the inner peripheral surface 23d of the support member 23 with respect to the rotation of the rotating member 26 in the seat lowering operation. The lowering operation of the seat 1 can be performed smoothly while offsetting the rotational torque in the lowering direction. Therefore, the frictional resistance between the wedge member 71 and the inner peripheral surface 23d of the support member 23 is appropriately adjusted, and the angle α of the inclined surface of the wedge member 71 with respect to the outer peripheral surface 26a of the rotating member 26 is adjusted accordingly. .

  In the second embodiment, the wedge member 71 moves together with the rotating member 26 when the rotating member 26 is rotated by the sheet lowering operation. Therefore, the protrusions 36a and 36f that come into contact with the wedge member 71 when the rotating member 26 rotates are unnecessary.

<Other embodiments>
As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible. For example, in the above embodiment, the present invention is applied to an automobile seat, but may be applied to a seat mounted on an airplane, a ship, a train, or the like, or a seat installed in a movie theater or the like.

  In the above embodiment, the locking mechanism is a mechanism that engages with the engagement ends 32c and 33c of the poles 32 and 33 and the internal teeth 34, but the coil spring is wound around the rotating shaft to lock the locking mechanism. What you do may be used.

  Moreover, in the said embodiment, although the wedge member was used as a friction member, you may use the brake device by a roller.

1 Car seat (seat)
2 Seat cushion 3 Seat back 4 Floor 5 Lower rail 6 Upper rail 7 Bracket 8 Seat slide device 10 Lifter device 11 Link member 11a Front link 11b Rear link 12 Link mechanism 13 Side frame 13a Through hole 14 Base member 16 Sector gear (input gear)
17 Torque rod 18 Pinion gear 20 Operation handle 21 Rotation control device 22 Rotating shaft 22a Outer peripheral surface 22b Spline 23 Support member 23a Through hole 23b Guide recess 23c Center hole 23d Inner peripheral surface 24 Cover 24a Opening 24b Engagement piece 24c Projection piece 24d Leg Portion 24e through hole 24f release piece 25 crimping pin 25a fitting hole 25b crimping end portion 26 rotating member 26a outer peripheral surface 26b outer surface 26c projection 26d spline hole 26e long hole 30 lock mechanism 31 lock plate 31a sliding surface portion 31b spline hole 31c long hole 31d, 31e Protrusion 32, 33 Pole 32a, 33a Through hole 32b, 33b Pin 32c, 33c Engagement end 34 Internal tooth 35 Torsion spring 35a Winding part 35b End part 36 Rotation transmission plate 36a Protrusion (contact part)
36b engagement hole 36c long hole 36d center hole 36e protrusion 36f protrusion (contact part)
37 Torsion spring 37a End 41 Input member 41a Through hole 41b Center hole 42 Engagement piece 43 Torsion spring 43a End 50 Rotation drive mechanism 51 Internal tooth 52 Feed claw 52a Engagement end 52b Hinge 52c Pin 52d Projection 53 Connection Member 53a arm 53b through hole 53c engagement hole 54 torsion spring 54a end 54b protrusion 60 stopper 61 support member side protrusion 62 engagement piece 63 rotating shaft side protrusion 71 wedge member (friction member)
72 Compression spring 71a Engagement part 71b Wide end part

Claims (6)

A pinion gear meshing with an input gear of a link mechanism that moves the seat up and down;
A rotation control device for controlling the rotation of the pinion gear,
The rotation control device includes:
A rotating shaft that rotates in synchronization with the pinion gear;
A support member that rotatably supports the rotating shaft;
When an operating handle for raising and lowering the seat is operated to raise or lower the seat, the operating force of the operating handle is transmitted to the rotating shaft to rotate the rotating shaft in the up or down direction. A rotational drive mechanism for driving;
A lifter device comprising: a lock mechanism that allows rotation of the rotation shaft when the operation handle is operated to raise or lower the seat and locks rotation of the rotation shaft at an operation end position of the operation handle. Because
Provided between the rotating shaft or the rotating member that rotates in synchronization with the rotating shaft and the supporting member, and when the rotating shaft rotates, the rotating direction between the rotating shaft or the rotating member and the supporting member A friction member for generating a frictional resistance of
The friction member is configured not to generate the frictional resistance when the rotation direction of the rotation shaft is a direction to raise the sheet, and to generate the friction resistance when the rotation direction of the rotation shaft is a direction to lower the sheet. Lifter device. In claim 1,
The friction member is a wedge member sandwiched between surfaces facing each other between the rotating shaft or the rotating member and the support member,
The wedge member is a lifter device having a wedge shape that spreads in the facing direction as it goes to the rotating shaft or the side where the rotating member rotates in the sheet lowering direction. In claim 2,
The support member has a container shape so as to accommodate the rotation drive mechanism and the lock mechanism therein, and the container shape has an inner peripheral surface concentric with the rotation shaft,
The rotating member is disposed within an inner peripheral surface of the support member with an outer peripheral surface facing the inner peripheral surface of the support member,
The wedge member is a lifter device disposed between the inner peripheral surface of the support member and the outer peripheral surface of the rotating member. In claim 3,
When the rotation drive mechanism rotates the rotation shaft in the seat lowering direction, the rotation drive mechanism comes into contact with the wedge member, and the wedge member is sandwiched between the opposing surfaces to increase the frictional resistance with respect to the outer peripheral surface of the rotation member. A lifter device comprising a contact portion that presses from a state toward a state in which frictional resistance is reduced. In claim 3,
The rotation drive mechanism includes a rotation transmission plate that is rotated in the ascending direction or the descending direction according to an operation of the operation handle,
The rotating member is configured to be engaged with the rotation transmission plate in a rotation direction and rotated by the rotation transmission plate;
When the rotating member rotates in the descending direction, the inclination angle of the portion of the wedge member that contacts the outer peripheral surface of the rotating member with respect to the outer peripheral surface of the rotating member is equal to the outer peripheral surface of the rotating member of the wedge member. It is made smaller than the friction angle of the outer peripheral surface of the rotating member at the part that contacts,
When the rotation transmission plate rotates in the descending direction, the rotation transmission plate comes into contact with the wedge member, and the frictional resistance is increased from the state in which the wedge member is sandwiched between the opposed surfaces and the frictional resistance with respect to the outer peripheral surface of the rotating member is increased. A lifter device comprising an abutting portion for pressing toward a state of reducing the size. In claim 3,
When the rotating member rotates in the descending direction, the inclination angle of the portion of the wedge member that contacts the outer peripheral surface of the rotating member with respect to the outer peripheral surface of the rotating member is equal to the outer peripheral surface of the rotating member of the wedge member. A lifter device that is larger than the friction angle of the outer peripheral surface of the rotating member at a contact portion.

Images