JP2019055679A - Power transmission device for power seat - Google Patents

Abstract

To inhibit relative displacement of a power transmission cable to a coupling member by suppressing sliding resistance between the power transmission cable and the coupling member during the relative displacement of the power transmission cable to the coupling member, in a power transmission device for a power seat that transfers power of a motor via the power transmission cable to a control mechanism of the power seat to operate the control mechanism and in which the power transmission cable and the motor or the coupling member of the control mechanism can be relatively displaced in accordance with a change of a relative distance between the motor and the control mechanism.SOLUTION: A sliding torque cable (power transmission cable) 16 is coupled to a cable connector (coupling member) 13a of a slide control mechanism Ms to enable relative displacement in the axial direction, and a guide portion is provided in the cable connector 13a. The guide portion comprises a groove 13c that forms a gap with an outer peripheral surface of the sliding torque cable 16 on an inner peripheral surface of the cable connector 13a receiving the outer peripheral surface in the fitting state.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a power transmission device for a power seat used in vehicles such as automobiles, airplanes, ships, and trains, or movie theaters.

  Patent Document 1 discloses an invention in which a lifter adjustment mechanism, a tilt adjustment mechanism, a slide adjustment mechanism, and a reclining angle adjustment mechanism in a power seat are operated by a single motor. In the present invention, the power of the motor is transmitted to each adjustment mechanism via a power transmission cable. The motor, the lifter adjustment mechanism, and the tilt adjustment mechanism are fixed to a side frame that is a skeleton member of the seat. On the other hand, the slide adjustment mechanism is fixed to the slide rail.

  In such a configuration, when the lifter adjustment mechanism is operated, the height of the side frame changes with respect to the slide rail. Therefore, the relative distance between the motor fixed to the side frame and the slide adjustment mechanism fixed to the slide rail changes due to the operation of the lifter adjustment mechanism. For this reason, the power transmission cable disposed between the motor and the slide adjustment mechanism absorbs the change in the relative distance by the change in the degree of bending of the power transmission cable.

  If the degree of bending of the power transmission cable is large, there is a possibility that the curved portion of the power transmission cable may be caught by peripheral articles when the seat slides. Therefore, although not a known technique, in order to suppress the degree of bending of the power transmission cable, the coupling between the power transmission cable and the coupling member that receives and couples the power transmission cable in the motor or the slide adjustment mechanism is determined in the axial direction of the power transmission cable. It is conceivable to perform it in a movable state. That is, when the relative distance between the motor and the slide adjusting mechanism is long, the coupling depth between the coupling member and the power transmission cable is shallow, and when the relative distance is short, the coupling depth is large. It is possible to make it movable.

JP 2013-107624 A

  However, in such a configuration, since the power transmission cable moves in the axial direction with respect to the coupling member in a curved state, the frictional resistance between the power transmission cable and the coupling member during movement in the axial direction increases, Movement may not occur as scheduled. In particular, when the relative distance between the motor and the slide adjustment mechanism changes from large to small, the power transmission cable moves in the axial direction so as to increase the coupling depth with respect to the coupling member while increasing the degree of curvature. The frictional resistance between the power transmission cable and the coupling member tends to increase. As a result, the movement in the axial direction is not sufficiently performed, and there arises a problem that the degree of bending of the power transmission cable becomes too large as expected.

  An object of the present invention is to transmit power of a motor to an adjustment mechanism of a power seat via a power transmission cable to operate the adjustment mechanism, and the power transmission cable according to a change in the relative distance between the motor and the adjustment mechanism. In the power transmission device for the power seat in which the motor and the coupling member of the adjustment mechanism are movable relative to each other, the frictional resistance between the power transmission cable and the coupling member during relative movement with respect to the coupling member is suppressed. Thereby, it is in suppressing that the relative movement with respect to the coupling member of a power transmission cable is prevented.

  A first aspect of the present invention is a power seat power transmission device in which the power of a motor is transmitted to a power seat adjustment mechanism via a power transmission cable to operate the adjustment mechanism, wherein the motor and the adjustment mechanism are separated from each other. The power transmission cable has one end inserted into and coupled to the output shaft coupling member of the motor, and the other end inserted and coupled to the input shaft coupling member of the adjustment mechanism. One end or the other end of the power transmission cable is coupled to the coupling member of the output shaft of the motor or the coupling member of the input shaft of the adjustment mechanism so as to be relatively movable in the axial direction, and the power transmission cable The coupling member coupled to be movable in the axial direction is provided with a guide portion, and the guide portion receives the outer peripheral surface of the power transmission cable in a fitted state. A groove is formed on the inner peripheral surface of the coupling member to receive a part of the outer peripheral surface between the outer peripheral surface and the groove, and the power transmission cable is bent and deformed with the relative movement. And extending in the axial direction from the power transmission cable side end of the coupling member at a position on the inner peripheral surface facing the moving direction.

  In the first invention, the relative movement of each member for fixing the motor and the adjusting mechanism (also referred to as the first adjusting mechanism) can be realized by the following three configurations. The first configuration is one that is relatively moved by the operation of the adjustment mechanism itself. The second configuration is relatively moved by a second adjusting mechanism provided separately from the first adjusting mechanism. The third configuration is provided separately from the first adjustment mechanism, and the motor is relatively moved by a common second adjustment mechanism. In the case of the second configuration, the second adjustment mechanism may be manually operated. Further, in the case of the third configuration, the adjustment mechanisms may be simultaneously operable by a common motor, or may be operable only individually. Further, in the case of the second and third configurations, the second adjustment mechanism is configured to move at least one of the members that fix the motor and the first adjustment mechanism.

  In the first invention, the coupling member coupled to the power transmission cable so as to be relatively movable is at least one of a coupling member of the output shaft of the motor and a coupling member of the input shaft of the adjustment mechanism. Further, the amount of the groove of the guide portion extending in the axial direction does not have to be on the entire inner peripheral surface of the coupling member, and can prevent contact with the outer peripheral surface of the bent power transmission cable, or can suppress the contact pressure. The degree is sufficient.

  When the relative distance between the motor and the adjustment mechanism changes, the power transmission cable is moved in the axial direction with respect to the coupling member. At this time, the degree of bending of the power transmission cable also changes. As the degree of bending of the power transmission cable with respect to the coupling member increases with a change in the degree of bending of the power transmission cable, the frictional resistance between the coupling member and the power transmission cable increases. According to the first invention, the groove of the guide portion that receives a part of the outer peripheral surface when the power transmission cable is bent is provided on the inner peripheral surface of the coupling member. It is received in the groove of the guide part. As a result, contact between the bent inner side of the outer peripheral surface of the bent power transmission cable and the inner peripheral surface of the coupling member is avoided or contact pressure is suppressed, and the distance between the two when the power transmission cable moves relative to the coupling member in the axial direction is reduced. The frictional resistance is suppressed. Therefore, the movement of the power transmission cable in the axial direction with respect to the coupling member is performed smoothly, and the problem that the degree of bending of the power transmission cable that may occur when the movement is insufficient is suppressed.

  In a second aspect based on the first aspect, a pair of grooves of the guide portion are provided at positions facing each other across the center of the inner peripheral surface.

  According to the second aspect of the present invention, since the pair of grooves of the guide portion are provided at positions facing each other on the inner peripheral surface of the coupling member, the power transmission cable is not only on the cable insertion port side of the coupling member but also on the back side. The tip of the outer peripheral surface is received in the groove. That is, the inner side of the outer peripheral surface of the power transmission cable is received in the groove on the cable insertion port side of the coupling member, and the outer side of the outer peripheral surface of the power transmission cable is received in the groove on the inner side of the coupling member. Therefore, it is possible to further suppress the frictional resistance between the two when the power transmission cable moves in the axial direction with respect to the coupling member.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the coupling members that receive the end portions of the power transmission cable are provided with a difference in height from each other. The lower side is coupled to the end of the power transmission cable so as to be movable in the axial direction, and the higher side of the coupling members is fixedly coupled to the end of the power transmission cable. Has been.

  If the coupling member on the higher side is movable with respect to the power transmission cable, the power transmission cable may receive gravity and move with respect to the coupling member and bend. The position becomes unstable. According to the third invention, the coupling member on the higher side is fixed to the power transmission cable, and the coupling member on the lower side is movable with respect to the power transmission cable. It is possible to prevent the position of the power transmission cable from becoming unstable.

  According to a fourth invention, in any one of the first to third inventions, the coupling member of the input shaft of the adjustment mechanism is coupled to the end of the power transmission cable so as to be movable in the axial direction, The coupling member of the output shaft of the motor is fixedly coupled to the end of the power transmission cable.

  When power is transmitted from the coupling member side to the power transmission cable, if the power transmission cable moves in the axial direction with respect to the coupling member, the power transmission efficiency may be reduced. According to the fourth aspect of the invention, the coupling member on the side that drives the power transmission cable is fixed to the power transmission cable, and the coupling member on the side that is driven by the power transmission cable is movable in the axial direction to the power transmission cable. Therefore, it is possible to suppress a decrease in transmission efficiency when power is transmitted from the coupling member side to the power transmission cable.

1 is a perspective view of a vehicle front seat to which a power seat power transmission device according to a first embodiment of the present invention is applied. It is an enlarged front view of the principal part of the said embodiment. It is an enlarged plan view of the principal part of the said embodiment. It is an expansion perspective view of the principal part of the said embodiment. It is explanatory drawing which shows a mode that the relative distance of the coupling member couple | bonded with the both ends of the power transmission cable in the said embodiment changes with a sheet | seat front view. It is explanatory drawing which shows a mode that the relative distance of a coupling member changes similarly to FIG. 5 by sheet | seat side view. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. FIG. 6 is a cross-sectional view taken along line VIII-VIII in FIG. 5. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8. It is sectional drawing corresponding to FIG. 7 which shows the coupling | bonding state of the power transmission cable and coupling member in the power transmission device of the power seat which is 2nd Embodiment of this invention.

  1 to 9 show a first embodiment of the present invention. This embodiment is an example in which the power transmission device for a power seat of the present invention is applied to a vehicle front seat (hereinafter simply referred to as a seat) 6. In each figure, each direction in the state which mounted | wore the vehicle with the sheet | seat 6 is shown by the arrow. In the following description, the description regarding the direction is made based on this direction.

  FIG. 1 shows the appearance of the sheet 6. In the seat 6, a seat back 8 forming a backrest is fixed to the back of a seat cushion 7 forming a seat portion so as to be able to turn back and forth. Therefore, a recliner (not shown) for adjusting the reclining angle of the seat back 8 is provided at the hinge portion between the rear portion of the seat cushion 7 and the lower portion of the seat back 8.

  A headrest 9 that supports the head of the seated occupant from the rear is provided at the upper end of the seat back 8. The right side portion of the seat cushion 7 is covered with a side shield 10 including the lower portion of the seat back 8. Housed in the side shield 10 is a power seat drive device 40 that allows the seating posture to be adjusted according to the preference of the passenger seated on the seat 6. The first operation knob 66 and the second operation knob 67 constituting the operation members in the drive device 40 are arranged so as to be exposed to the outside of the side shield 10 so as to be operated by the seated occupant.

  The seat 6 is fixed to the vehicle floor so as to be movable back and forth. Therefore, a pair of lower rails 1 are fixed to the vehicle floor below the left and right sides of the seat cushion 7. Each lower rail 1 is fitted with an upper rail 2 so as to be slidable in the front-rear direction with respect to the lower rail 1.

  On each upper rail 2, brackets 3a and 3b are dispersed and fixed in the front-rear direction, and a seat cushion 7 is fixed on each bracket 3a and 3b via a front link 4 and a rear link 5, respectively. . The front link 4 and the rear link 5 are tiltable in the front-rear direction with respect to the brackets 3a and 3b. Therefore, as will be described later, the seat 6 can be adjusted in height from the vehicle floor by adjusting the angles of the front link 4 and the rear link 5.

  2 to 4 show the skeleton structure of the lower portion of the seat 6 together with the driving device 40. In each of the left and right lower rails 1, a slide lead screw (not shown) is fixed along the front-rear direction. The female screw of the sliding nut member 11 is screwed into the male screw of the sliding lead screw. The slide nut member 11 is rotatably fixed to each upper rail 2. Although not shown, a bevel gear is formed on the outer peripheral side of each sliding nut member 11, and a direction changing bevel gear that meshes with the bevel gear is provided. Each of the direction changing bevel gears is fixed to each end portion of the slide connecting rod 14 having at least an end portion having a polygonal column shape. Therefore, when the slide connecting rod 14 is rotated, the slide nut member 11 is rotated via each bevel gear, the slide lead screw is used as a feed screw, and each upper rail 2 is moved back and forth together with the slide nut member 11. Slided in the direction.

  A sliding gear box 13 is coupled to an intermediate portion of the sliding connecting rod 14. The sliding gear box 13 incorporates helical gears that mesh with each other. One helical gear is fixed so as to rotate synchronously with the slide connecting rod 14, and the other helical gear 13b (see FIG. 5) is connected by a sliding torque cable (corresponding to a power transmission cable in the present invention) 16 described later. It is fixed to be rotated.

  Therefore, when the sliding torque cable 16 rotates by receiving the power of the motor 41, the rotation is transmitted to the sliding connecting rod 14 via the sliding gear box 13. Then, the slide connecting rod 14 rotates the slide nut member 11 to slide the upper rails 2. Here, the slide nut member 11, the slide lead screw, the slide gear box 13, and the slide connecting rod 14 together with the lower rail 1 and the upper rail 2 constitute a slide adjustment mechanism Ms as a slide position adjustment mechanism. Yes. The slide adjustment mechanism Ms corresponds to the adjustment mechanism in the present invention.

  The left and right front links 4 are rotatably fixed at their lower ends to the bracket 3 a, and the upper ends of the left and right front links 4 are fixed to the front end portion of the side frame 20 that forms the frame member of the seat cushion 7. The left and right rear links 5 each have a lower end rotatably fixed to the bracket 3 b and each upper end fixed to the rear end of the side frame 20 to be freely rotatable. Accordingly, the upper rail 2, the brackets 3a and 3b, the front link 4, the rear link 5, and the side frame 20 constitute a four-bar link.

  The right rear link 5 includes a sector gear portion 5a that is rotatable about a rear pipe 18 that is a rotation shaft on the side frame 20 side and that has a gear that spreads out in a substantially fan shape on the front side (see FIG. 4). ). The sector gear portion 5 a is separated leftward with respect to the rear link 5 and is integrated by a rear pipe 18. Further, a lifter gear box 21 is provided on the side surface of the side frame 20 adjacent to the right rear link 5 (see FIG. 2). The lifter gear box 21 incorporates a speed reduction mechanism including a worm (not shown) and a worm wheel (not shown). A lifter pinion (not shown) is coaxially fixed to the worm wheel. The lifter pinion is meshed with the sector gear portion 5a. The worm is fixed to an end portion of a lifter torque cable 22 extending in front of the lifter gear box 21.

  When the lifter torque cable 22 rotates, the rotation is transmitted to the worm, decelerated by the worm wheel, and transmitted to the lifter pinion. The rotation of the lifter pinion is transmitted to the rear link 5 via the sector gear portion 5a, and the rear link 5 rotates around the upper end. As a result, the front link 4 and the rear link 5 constituting the four-bar link rotate about the fixing point on the brackets 3a and 3b side, and the side frame 20 is raised and lowered with respect to the brackets 3a and 3b. Here, the front link 4, the rear link 5, and the lifter gear box 21 together with the brackets 3 a, 3 b and the side frame 20 constitute a lifter adjustment mechanism Ml as a lifter position adjustment mechanism.

  Recliner plates 31 made of a plate material are fixed to the rear end portions of the left and right side frames 20. A lower end portion of the seat back 8 is coupled to the recliner plate 31 via a substantially disc-shaped recliner 32. The recliner 32 constitutes a well-known hypocycloid reducer. That is, although not shown, the recliner 32 has a first disk that has an internal gear and is fixed to the recliner plate 31, and an external tooth that meshes with the number of teeth smaller than the number of teeth of the internal gear. A second disk having gears, a wedge member that maintains the eccentric state to mesh the internal gear and the external gear, and a second disk that is disposed coaxially with the first disk (internal gear). And a cam shaft for moving the wedge member. The recliner 32 is fixed to the seat back 8 on the second disk. The recliner 32 revolves the second disk while maintaining the meshing state of the internal gear and the external gear by the movement of the wedge member accompanying the rotation of the camshaft, so that the rotation number of the second disk at the time of this revolution is obtained. Decrease the rotation of the camshaft. Then, the seat back 8 rotates (tilts) with respect to the seat cushion 7 by the rotation of the second disk relative to the first disk.

  A recliner gear box 33 is fixed to the outer side of the right recliner plate 31. The recliner gear box 33 incorporates a speed reduction mechanism including a worm (not shown) and a worm wheel (not shown). The worm wheel has an axis extending in the seat width direction and is connected to a polygonal columnar recliner connecting rod 34 bridged between the recliners 32 on both sides so as to rotate integrally. The recliner connecting rod 34 passes through the recliners 32 on both sides and is connected to the camshafts so as to rotate integrally therewith. On the other hand, the worm is fixed to an end portion of a recliner torque cable 35 extending in front of the recliner gear box 33.

  Therefore, when the recliner torque cable 35 rotates, the rotation is decelerated between the worm on the input side of the recliner gear box 33 and the worm wheel on the output side, and is transmitted to the connecting rod 34 for the recliner. The rotation of the recliner connecting rod 34 is transmitted to the camshaft of the recliner 32. Accordingly, the second disk rotates with respect to the first disk of the recliner 32 in the above-described manner, and the seat back 8 rotates (tilts) with respect to the seat cushion 7. Here, the recliner 32, the recliner gear box 33, and the recliner connecting rod 34 together with the recliner plate 31 and the seat back 8 constitute a reclining angle adjusting mechanism Mr as a position adjusting mechanism for the recliner.

  As described above, this embodiment is a so-called 6-way power seat in which the seat position can be adjusted in the forward direction and the reverse direction in each of the slide adjustment mechanism Ms, the lifter adjustment mechanism Ml, and the reclining angle adjustment mechanism Mr. Yes.

  A driving device 40 is fixed to an intermediate portion in the front-rear direction of the right side frame 20. Although detailed description is omitted, the drive device 40 includes a drive mechanism portion and an operation mechanism portion, and a motor 41 having a single output shaft is connected to the drive mechanism portion. The output shaft of the motor 41 is connected to the sliding torque cable 16, the lifter torque cable 22, and the recliner torque cable 35 through a clutch mechanism (not shown). Therefore, the slide adjustment mechanism Ms, the lifter adjustment mechanism Ml, and the reclining angle adjustment mechanism Mr can be adjusted by one motor 41. On the other hand, the operation mechanism portion turns on / off a switch (not shown) inserted and connected to the drive circuit (not shown) of the motor 41 in accordance with the operation of the first operation knob 66 and the second operation knob 67 (see FIG. 1). A mechanism for operating and a mechanism for switching each clutch mechanism in the drive mechanism portion between connection and disconnection are provided.

  In the power seat described above, any of the clutches corresponding to the adjustment mechanisms Ms, Ml, and Mr selected by the operation of the first operation knob 66 and the second operation knob 67 is connected, and the output of the motor 41 is changed to each The torque is transmitted to any of the adjusting mechanisms Ms, Ml, and Mr via the torque cables 16, 22, and 35. As a result, one of the adjustment mechanisms Ms, Ml, and Mr is operated by one motor 41.

  The motor 41 and the driving device 40 are fixed to the side frame 20. The lifter adjustment mechanism Ml and the reclining angle adjustment mechanism Mr are also fixed so as not to move relative to the side frame 20. On the other hand, the slide adjustment mechanism Ms is fixed to the upper rail 2 away from the side frame 20. Therefore, when the height of the seat 6 is adjusted by the lifter adjustment mechanism Ml, as shown in FIGS. 5 and 6, the cable connector 51 which is the motor side connection portion at one end of the sliding torque cable 16 and the slide at the other end The relative position with respect to the cable connector 13a which is the adjustment mechanism Ms side connection portion changes in the vertical direction and the front-rear direction. This is because the cable connector 51 fixed to the side frame 20 moves with the rotation of the rear link 5 of the lifter adjustment mechanism Ml. As shown in FIG. 6, when the height of the seat 6 is the highest (indicated by a solid line) and the lowest state (indicated by a broken line), the position of the cable connector 51 is changed by Lh in the vertical direction, The position changes by L1 in the front-rear direction. Therefore, as shown in FIGS. 5 and 6, the distance between the cable connectors 51 and 13a is the shortest in the state where the height of the seat 6 is the lowest, and the cable in the state where the height of the seat 6 is the highest. The distance between the connectors 51 and 13a is the longest.

  The sliding torque cable 16 is configured such that the inner cable 16b is rotatable in the outer cable 16a, and the rotation is transmitted from one end side to the other end side by the inner cable 16b. The outer cable 16a is fixed so as not to move relative to the cable connector 51 on one end side, but is slidable in the axial direction of the sliding torque cable 16 with respect to the cable connector 13a on the other end side ( It is fixed to (movable). Further, the inner cable 16b is fixed so as not to move relative to the helical gear 49S on one end side at the rotation center, but slides on the rotation center with respect to the helical gear 13b on the other end side. The torque cable 16 is fixed to be slidable (movable) in the axial direction. The cable connector 13a corresponds to the “coupling member for the input shaft of the adjusting mechanism” in the present invention, and the cable connector 51 corresponds to the “coupling member for the output shaft of the motor” in the present invention. The helical gear 13b corresponds to the input shaft of the adjusting mechanism in the present invention. The helical gear 49S corresponds to the output shaft of the motor in the present invention.

  FIG. 7 shows a coupling structure of the sliding torque cable 16 to the cable connector 51. On the inner peripheral surface of the generally cylindrical cable connector 51, six ridges 51a are formed integrally with the circumferential direction so as to extend in the axial direction. Thus, by providing the protrusion 51a, the inner diameter of the cable connector 51 is slightly reduced, and the sliding torque cable 16 inserted into the cable connector 51 is in a press-fit state. Therefore, the sliding torque cable 16 (outer cable 16 a) is fixed so as not to move relative to the cable connector 51.

  FIG. 8 shows a coupling structure of the sliding torque cable 16 to the cable connector 13a. The outer cable 16a of the sliding torque cable 16 is loosely inserted into the generally cylindrical cable connector 13a so as to be slidable in the axial direction. Further, a groove 13c is formed in a part of the inner peripheral surface of the cable connector 13a in the circumferential direction so as to form a slight gap with the outer peripheral surface of the outer cable 16a. A pair of grooves 13c are provided at positions facing each other across the inner cable 16b at the center of the outer cable 16a. The position of the groove 13c is a position facing the direction in which the sliding torque cable 16 moves in the cable connector 13a when the height of the seat 6 is adjusted by the lifter adjusting mechanism Ml. As shown in FIG. 9, the groove 13c extends in the axial direction on the inner peripheral surface of the cable connector 13a. The groove 13c is formed by thinning the inner peripheral surface of the cable connector 13a into an arc shape in a cross-sectional view of FIG. 8, and its radial depth and arc shape slide as shown by an imaginary line in FIG. When the torque cable 16 is moved and bent, the inner wall surface of the bending torque cable 16 does not contact the inner peripheral edge 13e of the cable connector 13a, or the contact pressure does not increase even if it contacts. ing. The groove 13c corresponds to the guide portion in the present invention.

  Since a pair of grooves 13c are provided, the above-described function can be exhibited without problems even when the bending (curving) direction of the sliding torque cable 16 is reversed. When the sliding torque cable 16 is bent (curved) in one direction, the pressure opposite to the bending (curving) direction is applied to the cable connector 13a at the insertion end of the sliding torque cable 16 into the cable connector 13a. May work against the inner peripheral surface of The frictional force between the insertion end and the inner peripheral surface due to this pressure can be suppressed by the groove 13c formed on the inner peripheral surface. That is, the pair of grooves 13c can suppress both the frictional force inside the bending torque cable 16 and the frictional force outside the bending. The shape, size, and number of the grooves 13c are not limited to those described above.

  By connecting the sliding torque cable 16 to the cable connectors 51 and 13a as described above, the following operational effects can be achieved.

(1) Since the groove 13c is provided on the inner peripheral surface of the cable connector 13a, contact between the bent inner side of the outer peripheral surface of the bending torque cable 16 and the inner peripheral surface of the cable connector 13a is avoided or contacted. The pressure is suppressed, and the frictional resistance between the two when the sliding torque cable 16 is moved in the axial direction with respect to the cable connector 13a is suppressed. Therefore, the sliding torque cable 16 is smoothly moved in the axial direction with respect to the cable connector 13a, and the problem that the degree of bending of the sliding torque cable 16 that may occur when such movement is insufficient is suppressed is suppressed. Can do.

(2) The cable connector 51 having a higher height is fixed to the sliding torque cable 16, and the cable connector 13 a having a lower height is movable with respect to the sliding torque cable 16. If the cable connector 51 on the higher side is movable with respect to the sliding torque cable 16, there is a possibility that the sliding torque cable 16 receives gravity and moves with respect to the cable connector 51 and bends. Yes, the position of the sliding torque cable 16 becomes unstable. In the above embodiment, since the cable connector 51 is fixed to the sliding torque cable 16, it is possible to prevent the position of the sliding torque cable 16 from becoming unstable.

(3) The cable connector 51 on the side that drives the sliding torque cable 16 is fixed to the sliding torque cable 16, and the cable connector 13 a that is driven on the sliding torque cable 16 extends axially to the sliding torque cable 16. It can be moved. When power is transmitted from the helical gear 49S on the cable connector 51 side to the sliding torque cable 16, if the sliding torque cable 16 moves in the axial direction with respect to the cable connector 51, the power transmission efficiency may be reduced. . In the above embodiment, since the cable connector 51 is fixed to the sliding torque cable 16, the transmission efficiency when power is transmitted from the helical gear 49S of the cable connector 51 to the sliding torque cable 16 is reduced. Can be suppressed.

  FIG. 10 shows a second embodiment of the present invention. The feature of the second embodiment over the first embodiment is that the shape of the inner peripheral surface of the cable connector 13a is changed. Other configurations are the same, and the repetitive description of the same parts is omitted.

  As shown in FIG. 10, four protrusions 13d extend in the axial direction and are integrally formed on the inner peripheral surface of the cable connector 13a at equal intervals in the circumferential direction. The sliding torque cable 16 is inserted inside the cable connector 13a, but the protrusion 13d is adjusted so as not to be in pressure contact with the outer peripheral surface of the sliding torque cable 16. That is, the sliding torque cable 16 is slidable in the axial direction with respect to the cable connector 13a.

  As a result of forming the protrusion 13d on the inner peripheral surface of the cable connector 13a, a groove 13f that is substantially the same as the groove 13c in FIG. 8 is formed in a portion sandwiched between the protrusions 13d on the inner peripheral surface of the cable connector 13a. Is done. Therefore, the second embodiment can achieve the same effects as those of the first embodiment.

  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 a vehicle seat, but may be applied to a seat mounted on an airplane, a ship, a train, or the like, or a seat used in a movie theater.

  In the above embodiment, the slide adjustment mechanism and the lifter adjustment mechanism are operated by one motor. On the other hand, motors for operating both mechanisms may be provided independently of each other. As another embodiment, the lifter adjustment mechanism may be manually operated.

  As yet another embodiment, an adjustment mechanism that is operated by a motor via a power transmission cable may be used as an adjustment mechanism for folding the seat back. The folding adjustment mechanism is configured such that the seat back is bent in the front-rear direction at the middle portion in the vertical direction, and the bending angle can be adjusted. In this case, the relative position between the motor and the folding adjustment mechanism is changed by its own adjustment operation.

Ms Slide adjustment mechanism (Adjustment mechanism)
Ml Lifter adjusting mechanism Mr Reclining angle adjusting mechanism 1 Lower rail 2 Upper rail 3a, 3b Bracket 4 Front link 5 Rear link 5a Sector gear portion 6 Vehicle front seat (seat)
7 Seat cushion 8 Seat back 9 Headrest 10 Side shield 11 Slide nut member 13 Slide gear box 13a Cable connector (coupling member)
13b Hasuba gears 13c, 13f Groove (guide part)
13d ridge (guide part)
13e Inner peripheral edge portion 14 Slide connecting rod 16 Slide torque cable (power transmission cable)
16a outer cable 16b inner cable 18 rear pipe 20 side frame 21 lifter gear box 22 lifter torque cable 31 recliner plate 32 recliner 33 recliner gear box 34 recliner connecting rod 35 recliner torque cable 40 driving device 41 motor 49S helical gear 51 Cable connector (coupling member)
51a Projection 66 First Operation Knob 67 Second Operation Knob

Claims (4)

In the power transmission device for the power seat that transmits the power of the motor to the adjustment mechanism of the power seat via the power transmission cable to operate the adjustment mechanism.
The motor and the adjustment mechanism are respectively fixed to separate members that move relative to each other;
One end of the power transmission cable is inserted and coupled to the coupling member of the output shaft of the motor, and the other end is coupled to the coupling member of the input shaft of the adjusting mechanism.
One end or the other end of the power transmission cable is coupled to the coupling member of the output shaft of the motor or the coupling member of the input shaft of the adjustment mechanism so as to be relatively movable in the axial direction.
The coupling member to which the power transmission cable is coupled so as to be movable in the axial direction is provided with a guide portion, and the guide portion of the coupling member that receives the outer peripheral surface of the power transmission cable in a fitted state. It is comprised by the groove | channel which forms the clearance gap which accepts a part of this outer peripheral surface between this outer peripheral surface on this inner peripheral surface, and this groove | channel is the direction which the said power transmission cable moves by bending deformation with the said relative movement A power transmission device for a power seat, which is provided to extend in the axial direction from the power transmission cable side end of the coupling member at a position on the inner peripheral surface opposite to the inner surface. In claim 1,
A pair of grooves in the guide portion are provided in a position opposite to each other across the center of the inner peripheral surface. In claim 1 or 2,
The coupling members that receive the end portions of the power transmission cable are provided with a difference in height from each other.
The lower side of each of the coupling members is coupled to the end of the power transmission cable so as to be movable in the axial direction,
A power transmission device for a power seat in which a higher side of each coupling member is fixedly coupled to an end of the power transmission cable. In any one of Claims 1-3,
The coupling member of the input shaft of the adjustment mechanism is coupled to the end portion of the power transmission cable so as to be movable in the axial direction.
A power seat power transmission device in which a coupling member of the output shaft of the motor is fixedly coupled to an end of the power transmission cable.

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