JP2015066954A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat capable of securing a required reduction ratio and making a take-up device small.SOLUTION: A vehicle seat comprises: a movable member capable of moving relative to a seat frame; and a take-up device 100 disposed on the seat frame and taking up a cable 45 coupled to the movable member. The take-up device 100 comprises: a take-up force generation member (motor 110) having a rotation shaft 112 and a body part 111 for rotating the rotation shaft 112; a worm 120 disposed on the rotation shaft 112 of the take-up force generation member; a worm wheel 130 engaged to the worm 120; a pulley gear 160 having a take-up part 162 for taking up the cable 45 and a final input gear 161; and a reduction gear R having at least one gear, engaged with the worm wheel 130 and the final input gear 161, and reducing a speed of rotation of the worm wheel 130, and transmitting it to the pulley gear 160.

Description

  The present invention relates to a vehicle seat including a winding device for winding a cable coupled to a movable member that is movable with respect to a seat frame.

  Conventionally, as a winding device for winding a cable connected to a flexible member for a lumbar support that is movable with respect to a seat frame of a vehicle seat, a motor, a worm provided on a rotating shaft of the motor, There has been known one provided with a worm wheel meshing with a worm and a wheel adjacent gear meshing with the worm wheel (see Patent Document 1). In this technique, a winding portion for winding a cable is provided in the wheel adjacent gear.

JP 2005-523798 Gazette

  However, in the technique of Patent Document 1, since the winding portion is provided in the gear meshing with the worm wheel and the cable is wound, the worm wheel is obtained in order to obtain a necessary reduction ratio between the motor and the winding portion. There is a problem that the diameter of the gear having the winding portion must be increased, and the winding device becomes large.

  Accordingly, an object of the present invention is to provide a vehicle seat in which a winding device is downsized while ensuring a necessary reduction ratio.

  Moreover, an object of this invention is to suppress the operating sound of a winding device.

  The present invention that solves the above-described problem is a vehicle seat that includes a movable member that is movable with respect to the seat frame, and a winding device that is provided on the seat frame and winds a cable connected to the movable member. The winding device includes a winding force generating member having a rotating shaft and a main body for rotating the rotating shaft, a worm provided on the rotating shaft of the winding force generating member, a worm wheel meshing with the worm, and a cable. A pulley gear having a take-up portion for winding and a final input gear, and at least one gear, engaged with the worm wheel and the final input gear, decelerating the rotation of the worm wheel and transmitting it to the pulley gear And a speed reducer.

  According to such a configuration, since the reduction gear is interposed between the pulley gear having the winding portion and the worm wheel, it is necessary to increase the diameters of the pulley gear and the worm wheel in order to obtain a necessary reduction ratio. Therefore, it is possible to reduce the size of the winding device while ensuring the necessary reduction ratio.

  In the vehicle seat described above, it is desirable that the horizontal plane passing through the center of the pulley gear intersects the main body.

  By arranging the center of the pulley gear and the main body of the winding force generating member at the same height, the power transmission path from the rotating shaft of the winding force generating member to the pulley gear can be reduced in the vertical direction. The vertical size of the winding device can be reduced. The center of the pulley gear means a point on the rotation axis at the center in the axial direction of the pulley gear.

  In the vehicle seat described above, the seat frame has a seat back frame having left and right side frames that are spaced apart from each other on the left and right, and the left and right side frames have a width in the front-rear direction that is lower than the upper portion. The winding device further includes an occupant support member for supporting the occupant's back, which has a widened portion and has both ends engaged with the left and right widened portions and spanned between the widened portions. It is desirable that the winding force generating member is fixed to the widened portion so as to be located on the rear side of the position where the two engage.

  According to such a configuration, it is possible to suppress interference between the occupant support member and the winding force generation member while effectively using the space by arranging the occupant support member and the winding force generation member in the widened portion.

  In the vehicle seat described above, the winding portion has a winding groove into which the cable enters and is wound, and the winding groove has a portion adjacent to the winding start position of the cable deeper than the other portions. desirable.

  In order to prevent the cable from falling off the winding unit, it is necessary to wind the cable slightly at the winding start position even in the initial state where the cable is not being wound. If the initial winding portion has the same depth as the other portions, the initial winding portion reduces the remaining depth of the groove even though the initial winding portion cannot be used for the operation of the movable member. When the remaining depth of the groove becomes shallow in this way, when the cable is further wound outward, the cable protrudes outward at that portion, so that the winding portion is substantially enlarged by the amount of the protrusion. In the present invention, the portion corresponding to at least a part of the initial winding portion of the winding groove is made deeper than the other portions, so that the winding groove is moved to the other portion by the first cable wound around the initial winding portion. The pulley gear can be substantially reduced in size without being shallower than that.

  In the above-described vehicle seat, the winding device desirably includes a case that covers at least the inner side in the left-right direction of the winding force generating member.

  According to such a structure, it can suppress that the operation sound of a winding force generation member is transmitted in the left-right direction by a case, and can suppress the operation sound of a winding device.

  In the vehicle seat described above, it is desirable that both the gear and the pulley gear included in the speed reducer have their rotational axes directed in the front-rear direction.

  Thus, when the gears and pulley gears of the speed reducer are both arranged so that their rotational axes are directed in the front-rear direction, the diameters of these gears are directed in the vertical and horizontal directions. Therefore, since the diameter of the gear does not affect the size of the vehicle seat in the front-rear direction, the winding device can be reduced in size in the front-rear direction.

  In the vehicle seat described above, it is desirable that the cable is disposed between the rotating shaft of the gear included in the reduction gear and the winding force generating member when viewed from the axial direction of the gear included in the reduction gear.

  Thus, by arranging the cable in the space between the rotating shaft of the gear included in the reduction gear and the winding force generating member, the space can be effectively used to reduce the size of the winding device.

  In the vehicle seat described above, the pulley gear has, on the side surface in the axial direction, a convex portion for restricting the amount of rotation and an assembly groove for allowing the cable to pass when the cable is assembled. , Can be provided adjacent to the assembly groove.

  Thus, by providing a convex part adjacent to an assembly groove, the rigidity reduction by having formed the assembly groove can be supplemented by the convex part.

  According to the present invention, since the speed reducer is interposed between the pulley gear and the worm wheel, there is no need to increase the diameter of the pulley gear and the worm wheel, and the winding device can be secured while ensuring the necessary reduction ratio. It can be downsized.

  According to the present invention, the vertical size of the winding device can be reduced by arranging the pulley gear so that the center of the pulley gear is at the same height as the main body of the winding force generating member.

  According to the present invention, it is possible to suppress interference between the occupant support member and the take-up force generating member while arranging the occupant support member and the take-up force generating member in the widened portion to effectively use the space.

  According to the present invention, the portion of the winding groove adjacent to the winding start position of the cable is deeper than the other portion, so that the winding groove is moved to the other portion by the initial winding cable wound around the initial winding portion. The pulley gear can be substantially reduced in size without being shallower than that.

  According to the present invention, by providing the case that covers the inner side in the left-right direction of the winding force generating member, the operation sound of the winding force generating member is prevented from being transmitted to the inner side in the left-right direction by the case, and the operating sound of the winding device Can be suppressed.

  According to the present invention, the winding device can be reduced in size in the front-rear direction by arranging both the gear and the pulley gear included in the speed reducer such that the rotation axis thereof is directed in the front-rear direction.

  According to the present invention, by arranging the cable in the space between the rotating shaft of the gear included in the reduction gear and the winding force generating member, the space can be effectively used and the winding device can be reduced in size.

  According to the present invention, since the convex portion of the pulley gear is adjacent to the assembly groove, the rigidity reduction due to the formation of the assembly groove can be compensated by the convex portion.

It is a perspective view of a seat frame of a vehicle seat as a vehicle seat according to the present embodiment. It is the side view which looked at the winding apparatus of the state which removed the case of the left-right direction outer side from the left-right direction outer side. It is XX sectional drawing of FIG. It is the side view which looked at the winding apparatus of the state which removed the case of the left-right direction inner side attached to the side frame from the left-right direction inner side. It is the figure which looked at the pulley gear from the axial direction. It is the side view (a) explaining the winding device which concerns on a 1st modification, and YY sectional drawing (b) of (a). They are the side view (a) explaining the winding device which concerns on a 2nd modification, and ZZ sectional drawing (b) of (a). It is a figure equivalent to FIG. 3 which concerns on the modification of the axis | shaft of a gear.

Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, a vehicle seat S as an example of a vehicle seat according to an embodiment of the present invention is a seat used for a driver's seat of an automobile, and covers the seat frame F and the seat frame F. Provided with a cushion member and a skin material (not shown).

  The seat frame F mainly includes a seat cushion frame F1 and a seat back frame F2.

  The seat cushion frame F1 is a frame formed in a substantially rectangular frame shape, and a seat back frame F2 is rotatably connected to a rear portion thereof via a reclining mechanism (not shown).

  The seat back frame F2 mainly includes an upper frame 10, left and right side frames 20 spaced apart from each other, and a lower frame 30, and includes an upper frame 10, left and right side frames 20, and a lower portion. The frame 30 is formed in a substantially rectangular frame shape integrally joined by welding or the like. In the present specification, front and rear, left and right, and top and bottom are based on an occupant seated on the vehicle seat S in a state where the seat back is not reclining, and in particular, the up and down direction is provided by a winding device 100 described later. It is assumed that the rear edge 21C (see FIG. 4) of the side frame 20 of the seat back frame F2 at the provided portion extends.

  The upper frame 10 is composed of a horizontal pipe portion 11 extending in the left-right direction among pipe materials bent in a substantially U shape.

  The left and right side frames 20 are coupled to left and right vertical pipe portions 12 extending in the vertical direction among pipe materials bent in a substantially U shape, left and right side frame main body portions 21 coupled to the lower portions thereof, and lower portions thereof. The lower side frame 22 is configured.

  The left and right side frame main body portions 21 are formed in a substantially U shape in sectional view by pressing a metal plate or the like, and are arranged to face in the left-right direction. The side frame main body portion 21 is coupled to the vertical pipe portion 12 with the vertical pipe portion 12 held at the upper portion thereof, and the lower portion is formed in a shape having a widened portion 21A having a width in the front-rear direction larger than that of the upper portion. Has been.

  The left and right lower side frames 22 are formed in a substantially U shape in cross-section by pressing a metal plate or the like, and are disposed facing each other in the left-right direction. The upper part of the lower side frame 22 is coupled to the side frame main body 21.

  The lower frame 30 has a plate-like connection frame 31 and a pipe-like connection shaft 32, and is connected to the lower portions of the left and right side frames 20.

  A pressure receiving member 50 as an example of an occupant support member is disposed inside the frame-shaped seat back frame F2 configured as described above. The pressure receiving member 50 includes a pressure receiving plate 51 made of resin, an upper connecting wire 52 that supports the upper portion of the pressure receiving plate 51 on the side frame 20, and a lower connecting wire 53 that supports the lower portion of the pressure receiving plate 51 on the side frame 20. . The upper connecting wire 52 and the lower connecting wire 53 span the rear side of the pressure receiving plate 51 from side to side and are engaged with the pressure receiving plate 51 (not shown). Both ends of the upper connecting wire 52 engage with connecting holes 29A formed in the upper part of the side frame main body 21, and both ends of the lower connecting wire 53 are formed in the lower part of the side frame main body 21. The connecting hole 29B is engaged. The upper connecting wire 52 and the lower connecting wire 53 are formed to be bent a plurality of times in the vertical direction, and thus have some springiness, and the pressure receiving member 50 receives a large load from the back of the occupant to the rear. When hooked, the upper connecting wire 52 and the lower connecting wire 53 are bent so that they can move rearward.

  A flexible plate 40 as an example of a movable member is disposed on the front surface of the pressure receiving plate 51. The flexible plate 40 is engaged with and supported by the pressure receiving plate 51 at the upper edge 41 (not shown), and the lower edge 42 can move freely with respect to the pressure receiving plate 51.

  A cable 45 that can be wound by the winding device 100 is connected to the lower end of the flexible plate 40. The cable 45 is inserted into a cylindrical sheath 46, and one end of the sheath 46 is locked to the locking portion 43 at the upper end portion of the pressure receiving plate 51. For this reason, when the cable 45 is wound by the winding device 100, the distal end of the cable 45 is drawn toward one end of the sheath 46, so that the flexible plate 40 is curved so as to protrude forward. Further, when the cable 45 is rewound by the winding device 100, the flexible plate 40 returns to its original shape by its elastic restoring force. Thereby, since the amount of protrusion to the front of the flexible plate 40 is adjusted by the winding device 100, the flexible plate 40 functions as a suitable lumbar support that matches the body shape of the occupant.

  The winding device 100 is a device for winding or rewinding the cable 45, and is fixed to the left and right inner sides of the widened portion 21 </ b> A in the right side frame 20. Specifically, it is fixed by three tapping screws 119 (see FIG. 4) below the upper connecting hole 29A in the side frame main body 21 and on the rear side of the lower connecting hole 29B.

  An airbag device 60 is fixed to the right side frame 20 with two bolts 61. Specifically, welding nuts 28 </ b> A and 28 </ b> B are welded to the left and right inner side surfaces of the right side frame main body 21 at the upper end and the lower end, respectively. It is attached from the outside, and is fixed by screwing the bolt 61 into the welding nuts 28A and 28B. The welding nut 28 </ b> A is located above the winding device 100, and the welding nut 28 </ b> B is located on the front side of the winding device 100. In other words, the winding device 100 is fixed to the side frame 20 at a position shifted from the welding nuts 28 </ b> A and 28 </ b> B, which are attachment portions of the airbag device 60.

Next, the winding device 100 will be described in detail.
As shown in FIG. 2, the winding device 100 includes a motor 110, a worm 120, a worm wheel 130, a first reduction gear 140 and a second reduction gear 150 as a reduction gear R, and a pulley gear 160. It becomes. As shown in FIG. 3, these members are housed in a case CA formed by combining a left case 101 and a right case 102. In the present specification, the pitch circle diameter of an output gear that outputs two driving forces is a gear having two gears that rotate integrally, and the output gear that outputs the driving force is larger than the pitch circle diameter of the input gear to which the driving force is input. The smaller one is called “reduction gear”.

  Returning to FIG. 2, the motor 110 has a columnar main body 111 that is long in the vertical direction, and a rotating shaft 112 that protrudes upward from the upper end of the main body 111. The main body 111 has a rotating shaft 112. It is configured to be rotatable in the forward direction and the reverse direction. A connector 111 </ b> A for connecting to a control device (not shown) protrudes from the lower end of the main body 111. The motor 110 is driven by power supplied from a control device.

  The worm 120 is provided on the rotating shaft 112 of the motor 110 and rotates integrally with the rotating shaft 112.

  The worm wheel 130 is a reduction gear that is provided on the front side of the worm 120 and integrally includes a worm wheel gear 131 that meshes with the worm 120 and a first output gear 132 that has a smaller pitch circle diameter than the worm wheel gear 131.

  The first reduction gear 140 is provided on the front side of the worm wheel 130, and a first input gear 141 that meshes with the first output gear 132 and a second output gear 142 that has a smaller pitch circle diameter than the first input gear 141 are integrated. It is the reduction gear which has.

  The second reduction gear 150 is provided below the first reduction gear 140, and a second input gear 151 that meshes with the second output gear 142, and a third output gear 152 that has a smaller pitch circle diameter than the second input gear 151. Is a reduction gear.

The pulley gear 160 is a gear that is provided below the second reduction gear 150 and integrally includes a final input gear 161 that meshes with the third output gear 152 and a winding portion 162 that winds the cable 45. The winding portion 162 is provided with a winding groove 163 (see FIG. 3) around which the cable 45 enters and is wound.
Each of the gears is, for example, a spur gear or a helical gear.

  As can be seen from FIG. 2, in the winding device 100, the rotating shaft 112 that is the output shaft of the motor 110 is arranged at the upper portion, and each gear has its power transmission path from the rotating shaft 112 to the front side and further to the lower side. Arranged to go to the side. The left case 101 has a shape that surrounds the motor 110 and the gears 130 to 160. The rear side is large in the vertical direction, and the front side has a concave portion 101N in the lower part and has a vertical size. It is getting smaller. In other words, the upper part of the left case 101 protrudes forward. Further, the left case 101 has two bosses 101A and 101B having attachment holes on the upper part, and a boss 101C having attachment holes at the position of the recess 101N. As shown in FIG. 4, the right case 102 has a symmetrical shape with the left case 101, and has bosses 102A, 102B having mounting holes at positions corresponding to the bosses 101A, 101B, 101C of the left case 101. , 102C.

  As shown in FIG. 1, the case CA covers the left and right inner sides where the occupant of the motor 110 is located, thereby suppressing the operating sound of the motor 110 from being transmitted to the occupant. In addition, since the case CA also covers the front side of the motor 110, the operating sound of the motor 110 is also prevented from being transmitted to the occupant.

  As shown in FIG. 3, the left case 101 has bosses 101E, 101F, 101G, and 101H rising from the bottom surface, and the right case 102 has bosses 102E, 102F, 102G, and 102H rising from the bottom surface. Each boss is formed with a shaft support hole which is shown by omitting the reference numerals. The worm wheel 130, the first reduction gear 140, the second reduction gear 150, and the pulley gear 160 are provided such that shafts 135, 145, 155, and 165 protrude from both side surfaces of the gears 130 to 160, respectively. These shafts 135, 145, 155, and 165 are engaged with the bosses 102E, 102F, 102G, and 102H, whereby the gears 130 to 160 are rotatably supported by the case CA. In FIG. 3, the shafts 135, 145, 155, and 165 are shown as being separate parts from the gears 130 to 160. However, as shown in FIG. You may be comprised integrally with the gearwheels 130-160. The form of integral molding as shown in FIG. 8 can be easily manufactured by molding and sintering the material powder by powder metallurgy.

  Since the final input gear 161 and the third output gear 152 are transmitted as they are without decreasing the tensile force of the cable 45, the tooth width is larger than that of the other gears. The pulley gear 160 is arranged with the winding portion 162 facing the left side and the final input gear 161 facing the right side. The second reduction gear 150 is arranged with the large-diameter second input gear 151 facing the right side and the small-diameter third output gear 152 facing the left side. The first reduction gear 140 is arranged with the small-diameter second output gear 142 facing the right side and the large-diameter first input gear 141 facing the left side. Further, the worm wheel 130 is disposed with the small-diameter first output gear 132 facing the right side and the large-diameter worm wheel gear 131 facing the left side.

  That is, of the worm wheel 130 and the first reduction gear 140, the first input gear 141 and the worm wheel gear 131 having a large diameter are compared with the second input gear 151 that is the large diameter gear of the second reduction gear 150. The third output gear 152, which is a small-diameter gear, is disposed on the side where the third output gear 152 is disposed, that is, on the left side.

  Since the tooth width of the worm wheel gear 131 and the first input gear 141 is smaller than that of the third output gear 152 of the second reduction gear 150, the worm wheel gear 131 and the first input gear 141 are disposed on the side where the third output gear 152 is disposed with respect to the second input gear 151. By doing so, it is possible to suppress an increase in the axial size of the gear train composed of these three gears. In the present embodiment, the worm wheel gear 131 and the first input gear 141 are arranged in a range where the third output gear 152 is arranged in the axial direction.

  The radius of the worm wheel gear 131 (distance from the rotation axis to the tooth tip) is larger than the distance from the rotation axis of the worm wheel gear 131 to the tooth tip of the second output gear 142, and the rotation axis of the worm wheel gear 131. Is smaller than the distance from the outer peripheral surface of the shaft 145. Therefore, the boss 101F has a notch 101K formed in a portion facing the worm wheel gear 131 in the radial direction. For this reason, the worm wheel gear 131 enters the notch 101K, and interference between the boss 101F and the worm wheel gear 131 is prevented. In this way, by reducing the inter-axis distance between the worm wheel 130 and the first reduction gear 140 as much as possible, the entire winding device 100 is reduced in size while ensuring a necessary reduction ratio.

  As shown in FIG. 2, the left case 101 is provided with a sheath locking portion 101 </ b> P that locks the end portion of the sheath 46 that holds the cable 45 on the upper surface of the front side of the shaft 135 of the worm wheel 130. The cable 45 extends downward from the end of the sheath 46 that is locked to the sheath locking portion 101P, and is wound around the winding portion 162 of the pulley gear 160 in the counterclockwise direction of FIG. Therefore, in the winding device 100, the cable 45 is rotated by the motor 110, the first reduction gear 140, and the second reduction gear 150 when viewed from the axial direction of the first reduction gear 140 and the second reduction gear 150. It arrange | positions between the axis | shaft 145 and the axis | shaft 155 which are axes | shafts. Thus, by arranging the cable 45 in the space between the rotation shaft (shafts 145 and 155) of the first reduction gear 140 and the second reduction gear 150 as the reduction gear R and the motor 110, the space can be effectively used. Thus, downsizing of the winding device 100 is realized.

  As shown in FIG. 4, the horizontal plane PL passing through the center 168 of the pulley gear 160 intersects the main body portion 111 of the motor 110 in a state where the seat back frame F <b> 2 is upright and the trailing edge 21 </ b> C is vertical. That is, the center 168 of the pulley gear 160 and the main body 111 of the motor 110 are located at the same height. As described above, the rotation output of the motor 110 is transmitted from the rotating shaft 112 to the worm wheel 130, the first reduction gear 140, the second reduction gear 150, and the pulley gear 160. The motor 110 is arranged from the upper end to the front side and the lower side, and the center 168 of the pulley gear 160 is arranged at the same height as the main body 111 of the motor 110, so that the transmission path becomes smaller in the vertical direction. Thus, the vertical size of the winding device 100 can be reduced.

  The motor 110 is disposed on the rear side of the connection hole 29B with which the lower connection member 53 of the pressure receiving member 50 is engaged. For this reason, it is possible to suppress interference between the pressure receiving member 50 and the motor 110 while arranging the pressure receiving member 50 and the motor 110 in the widened portion 21A to effectively use the space.

  The pulley gear 160 has a convex portion 166 protruding from the side surface 162A (see FIG. 5) on the winding portion 162 side in the axial direction, that is, toward the left side. On the other hand, the left case 101 has a stopper 105 protruding toward the inside of the case CA as shown by hatching in FIG. 4 (see also FIG. 3). The convex portion 166 is disposed so as to be able to come into contact with the stopper 105 in the rotation direction, and functions to regulate the amount of rotation of the pulley gear 160 by coming into contact with the stopper 105. As shown in FIG. 3, the protruding amount of the convex portion 166 from the winding portion 162 is smaller than the protruding amount of the shaft 165 from the winding portion 162, thereby reducing the size of the winding device 100. Yes.

  As shown in an enlarged view in FIG. 5, the convex portion 166 has a first contact surface 166A facing the clockwise direction side and a second contact surface 166B facing the counterclockwise direction side. Both the contact surface 166A and the second contact surface 166B extend toward the rotation axis of the pulley gear 160, that is, in the diameter direction. Further, the stopper 105 of the left case 101 has a winding stopper surface 105A facing in the counterclockwise direction in FIG. 5 and a rewinding stopper surface 105B facing in the clockwise direction. Both 105A and the rewinding stopper surface 105B extend toward the rotation axis of the pulley gear 160, that is, in the diameter direction. As a result, the winding stopper surface 105A and the first contact surface 166A can contact each other exactly, and wear of these surfaces can be suppressed. Similarly, the flat surface of the rewinding stopper surface 105B and the second contact surface 166B can be in close contact with each other (not shown), and wear of these surfaces can be suppressed.

  The pulley gear 160 has an assembly groove 167 through which the cable 45 passes when the locking piece 45A at the end of the cable 45 is assembled to the side surface 162A on the winding unit 162 side. The protrusions 166 described above are disposed adjacent to the assembly groove 167, and are preferably disposed within a range of ± 90 degrees in the rotation direction with respect to the assembly groove 167, whereby the assembly groove 167 is formed. The reduction in rigidity of the pulley gear 160 due to the formation can be compensated by the convex portion 166.

  In the winding groove 163, a portion adjacent to the winding start position P1 of the cable 45 on the side where the cable 45 starts to be wound is deeper than the other portions. In the present embodiment, the range shown as the angle range A1 in FIG. 5 is deeper than the other portions. Thus, in the state where the pulley gear 160 shown in FIG. 5 has wound the cable 45 to the maximum extent, the cable 45 extending from the sheath 46 (the linearly stretched cable 45 corresponding to the second winding) There is no interference with the eye cable 45.

  The cable 45 needs to be slightly wound even in an initial state where the cable 45 is not wound by the pulley gear 160 so that the cable 45 does not fall off from the winding groove 163 of the winding portion 162. For example, in the initial state, if only the angle range A1 of FIG. 5 is wound, the winding groove 163 becomes shallower by the thickness of the cable 45 in the wound portion, but in the present embodiment, the angle range A1. Since the winding groove 163 is deeper than the other, the cable 45 wound around the initial winding portion can prevent the winding groove 163 from becoming substantially shallower than the other portions. For this reason, if the angle range A1 is not deep, if the cable 45 is wound twice, the cable 45 may protrude outward in the radial direction from the take-up portion 162. Therefore, the pulley gear 160 can be substantially reduced in size.

The effect of the vehicle seat S provided with the winding device 100 configured as described above will be described.
In the vehicle seat S, since the reduction gear R is interposed between the pulley gear 160 having the winding portion 162 and the worm wheel 130, the diameters of the pulley gear 160 and the worm wheel 130 are obtained in order to obtain a necessary reduction ratio. There is no need to make it so large. Therefore, the winding device 100 can be downsized while ensuring the necessary reduction ratio.

  Since the horizontal plane PL passing through the center 168 of the pulley gear 160 intersects the main body 111 of the motor 110, the driving force transmission path from the rotating shaft 112 of the motor 110 to the pulley gear 160 and the gears 130 to 160 are also shown. Can be made compact in the vertical direction, and the winding device 100 can be miniaturized in the vertical direction.

  Further, the side frame 20 has a widened portion 21A, the pressure receiving member 50 is engaged with the connecting hole 29B of the widened portion 21A, and the winding device 100 is disposed on the rear side of the connecting hole 29B. The interference between the pressure receiving member 50 and the motor 110 can be suppressed while effectively using the space by arranging the pressure receiving member 50 and the motor 110 in the widened portion 21A.

  Since the winding groove 163 is deeper than the other part on the winding side of the winding start position P1 of the cable 45, the cable 45 is wound by the winding part 162 when the cable 45 is wound a plurality of times. Therefore, the pulley gear 160 can be substantially reduced in size.

  Moreover, since the winding device 100 has a case CA that covers the left and right inner sides and the front side of the motor 110, the operating sound of the motor 110 is not easily transmitted to the occupant.

  Furthermore, since the reduction gear R has two reduction gears of the first reduction gear 140 and the second reduction gear 150, the diameter of each gear 130 to 160 can be reduced and the winding device 100 can be downsized.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with appropriate modifications as shown in other embodiments below. For example, FIGS. 6 and 7 show a first modified example and a second modified example of the winding device applied to the vehicle seat of the present invention, respectively. Each of the first modification and the second modification is a form in which the rotation axes of the gears and the pulley gears included in the reduction gear face the front-rear direction. Note that, in the first modification and the second modification, the same reference numerals are given to the same configurations as those in the embodiment, and the description thereof is omitted.

[First Modification]
As shown in FIGS. 6 (a) and 6 (b), the winding device 200 according to the first modification configures a motor 110, a worm 120, a worm wheel 230, and a reduction gear R1 in a case CA1. The first reduction gear 240, the second reduction gear 250, and the pulley gear 260 are provided.

  The motor 110 is disposed on the front side in the case CA1, and a lower end portion thereof partially protrudes from the case CA1.

  The worm wheel 230 includes a worm wheel gear 231 that meshes with the worm 120 and a first output gear 232 having a larger pitch circle diameter than the worm wheel gear 231.

  As for the 1st reduction gear 240, the 2nd reduction gear 250, and the pulley gear 260, the rotating shaft line 249,259,269 has faced the front-back direction. That is, it is orthogonal to both the direction in which the rear edge 21C of the portion of the side frame 20 where the winding device 100 is disposed extends and the left-right direction. In the present invention, the term “the rotation axis is oriented in the front-rear direction” includes the case where the rotation axis is substantially oriented in the front-rear direction, and is preferably within 10 degrees with respect to the front-rear direction.

  The first reduction gear 240 is provided on the rear side of the worm wheel 230, and a first input gear 241 that meshes with the first output gear 232 while facing it, and a second output gear that has a smaller pitch circle diameter than the first input gear 241. 242 is a reduction gear integrally having 242. The first input gear 241 is a face gear. The first reduction gear 240 is arranged with the large-diameter first input gear 241 on the front side. The first reduction gear 240 is pivotally supported by the case CA1 via the shaft 245. The shaft 245 is cantilevered by the case CA1 on the side opposite to the first input gear 241.

  The second reduction gear 250 is provided below the first reduction gear 240, and a second input gear 251 that meshes with the second output gear 242, and a third output gear 252 that has a smaller pitch circle diameter than the second input gear 251. Is a reduction gear. The second reduction gear 250 is arranged with the large-diameter second input gear 251 on the rear side. The second reduction gear 250 is supported at both ends by the case CA1 through the shaft 255.

The pulley gear 260 is a gear that is provided below the second reduction gear 250 and integrally includes a final input gear 261 that meshes with the third output gear 252 and a winding unit 262 that winds the cable 45. The winding portion 262 is provided with a winding groove 263 around which the cable 45 enters and is wound. The winding portion 262 has a smaller diameter than the final input gear 261, and the pulley gear 260 is disposed with the large-diameter final input gear 261 on the front side. The pulley gear 260 is supported at both ends by the case CA1 via the shaft 265.
Each of the gears is a spur gear or a helical gear, for example, except for the first input gear 241.

  A horizontal plane PL passing through the center 268 of the pulley gear 260 intersects with the main body 111 of the motor 110. As a result, similarly to the above-described embodiment, the winding path 200 is downsized by reducing the transmission path of the driving force.

  Even with the winding device 200 having such a configuration, the reduction gear R1 is interposed between the worm wheel 230 and the pulley gear 260, so that the diameters of the pulley gear 260 and the worm wheel 230 are set to obtain a necessary reduction ratio. There is no need to make it too big. Therefore, the winding device 200 can be downsized while ensuring the necessary reduction ratio.

  Since the first reduction gear 240, the second reduction gear 250, and the pulley gear 260, which are the gears of the reduction gear R1, are arranged so that their rotational axes 249, 259, and 269 face in the front-rear direction. The diameter of the gear is directed in the vertical and horizontal directions. Therefore, the diameters of these gears do not affect the size of the vehicle seat in the front-rear direction, so that the winding device 200 can be downsized in the front-rear direction.

  Moreover, since the 1st reduction gear 240, the 2nd reduction gear 250, and the pulley gear 260 have arrange | positioned those large diameter sides alternately in the front-back direction, the thickness of the front-back direction of the part which has arrange | positioned these three gears. Can be reduced.

[Second Modification]
As shown in FIGS. 7A and 7B, the winding device 300 according to the second modification is substantially the reverse of the arrangement of the components in the case CA2 with respect to the winding device 200 according to the first modification. The motor 110, the worm 120, the worm wheel 230, the first reduction gear 240 and the second reduction gear 250 that constitute the reduction gear R1, and the pulley gear 260 are configured.

  In the case CA2, the motor 110, the worm 120, the worm wheel 230, the first reduction gear 240, and the second reduction gear 250 are disposed symmetrically with respect to the winding device 200 according to the first modification.

  The pulley gear 260 is provided below the second reduction gear 250, and the final input gear 261 meshes with the third output gear 252. The pulley gear 260 is arranged with the final input gear 261 on the front side. For this reason, since the winding part 262 is located behind the third output gear 252, the cable 45 is less likely to interfere with the third output gear 252, and the locking part at the end of the sheath 46 that holds the cable 45. The degree of freedom of arrangement of 301P is high.

Also in the winding device 300, the horizontal plane PL passing through the center 268 of the pulley gear 260 intersects the main body 111 of the motor 110. Thereby, similarly to the above-described embodiment, the winding path of the winding device 300 is reduced by reducing the transmission path of the driving force.
Also in the second modified example, the shaft 245 that supports the first reduction gear 240 is cantilevered on the case CA2 on the side opposite to the first input gear 241, and the second reduction gear 250 supports the shaft 255. The pulley gear 260 is supported at both ends by the case CA2 via the shaft 265.

  Also with the winding device 300 having such a configuration, since the reduction gear R1 is interposed between the worm wheel 230 and the pulley gear 260, the diameters of the pulley gear 260 and the worm wheel 230 are reduced in order to obtain a necessary reduction ratio. There is no need to make it too big. Therefore, the winding device 300 can be reduced in size while ensuring a necessary reduction ratio.

  Since the first reduction gear 240, the second reduction gear 250, and the pulley gear 260, which are the gears of the reduction gear R1, are arranged so that their rotational axes 249, 259, and 269 face in the front-rear direction. The diameter of the gear is directed in the vertical and horizontal directions. Therefore, the diameters of these gears do not affect the size of the vehicle seat in the front-rear direction, so that the winding device 300 can be reduced in size in the front-rear direction.

[Other variations]
In the above embodiment, the cable 45 is drawn from above the case CA, but it may be drawn from below or from the side. In the above embodiment, the rotating shaft 112 protrudes from above the main body 111 of the motor 110. However, the rotating shaft 112 may protrude from below the main body 111, for example, as shown in FIG. It is also possible to use the winding device 100 upside down.

  In the embodiment, the mode in which the reduction gear R has two reduction gears is illustrated, but the reduction gear R may have only one reduction gear.

  In the above-described embodiment, the vehicle seat S used in an automobile is exemplified as the vehicle seat. However, the present invention is not limited to this, and the vehicle seat S is used in other vehicle seats, for example, railway vehicles, ships, and aircrafts. It can also be applied to a sheet to be processed.

  In the above-described embodiment, the lumbar support flexible plate 40 is exemplified as the movable member. However, the present invention is not limited to this. For example, the side support for supporting the occupant's thigh from the outside in the left-right direction is inflated in the left-right direction. It may be a movable member for adjusting the amount of protrusion. In addition, since such a movable member is provided in a seat cushion, you may provide a winding apparatus in a seat cushion frame in this case.

  In the above embodiment, the motor 110 is exemplified as the winding force generating member. However, the present invention is not limited to this, and the winding force generating member is, for example, a rotating shaft and the rotating shaft to rotate the rotating shaft. A dial-type operation unit (main body unit) provided at the end of the shaft and operated by the user may be provided.

DESCRIPTION OF SYMBOLS 20 Side frame 21 Side frame main-body part 21A Widening part 21C Rear edge 28A, 28B Weld nut 29A, 29B Connection hole 40 Flexible plate 45 Cable 46 Sheath 50 Pressure receiving member 51 Pressure receiving plate 52 Upper connection wire 53 Lower connection wire 60 Airbag apparatus DESCRIPTION OF SYMBOLS 100 Winding device 101 Left case 102 Right case 105 Stopper 105A Winding stopper surface 105B Rewinding stopper surface 110 Motor 111 Main body part 112 Rotating shaft 120 Worm 130 Worm wheel 131 Worm wheel gear 132 First output gear 140 First deceleration Gear 141 First input gear 142 Second output gear 145 Shaft 150 Second reduction gear 151 Second input gear 152 Third output gear 155 Shaft 160 Pulley gear 161 Final input gear 162 Winding portion 16 3 Groove 165 Shaft 166 Protruding part 167 Assembly groove 168 Center 200 Winding device CA Case F Seat frame F1 Seat cushion frame F2 Seat back frame P1 Winding start position PL Horizontal plane R Reducer S Vehicle seat

Claims (8)

A vehicle seat comprising: a movable member that is movable with respect to a seat frame; and a winding device that is provided on the seat frame and winds a cable connected to the movable member,
The winding device
A winding force generating member having a rotating shaft and a main body for rotating the rotating shaft;
A worm provided on a rotating shaft of the winding force generating member;
A worm wheel meshing with the worm;
A pulley gear having a winding part for winding the cable and a final input gear;
A vehicle seat, comprising: a reduction gear that has at least one gear, engages with the worm wheel and the final input gear, and reduces the rotation of the worm wheel and transmits the rotation to the pulley gear.   The vehicle seat according to claim 1, wherein a horizontal plane passing through a center of the pulley gear intersects the main body. The seat frame includes a seat back frame having left and right side frames that are spaced apart from each other on the left and right.
The left and right side frames have a widened portion at the bottom, which is wider in the front-rear direction than the top.
An occupant support member for supporting the back of the occupant, both ends engaged with the widened part on the left and right sides and spanned between the widened parts,
2. The winding device according to claim 1, wherein the winding device is fixed to the widened portion so that the winding force generating member is positioned behind the position where the occupant support member is engaged with the widened portion. The vehicle seat according to claim 2. The winding portion has a winding groove into which the cable enters and is wound,
4. The vehicle seat according to claim 1, wherein a portion of the winding groove adjacent to the winding start position of the cable is deeper than the other portions. 5.   The vehicle seat according to any one of claims 1 to 4, wherein the winding device includes a case that covers at least a laterally inner side of the winding force generating member.   The vehicle seat according to any one of claims 1 to 5, wherein a rotation axis of both the gear of the reduction gear and the pulley gear is directed in the front-rear direction.   The said cable is arrange | positioned between the rotating shaft of the gear which the said reduction gear has, and the said winding force generation | occurrence | production member seeing from the axial direction of the gear which the said reduction gear has. The vehicle seat according to claim 6. The pulley gear has, on the side surface in the axial direction, a convex portion for restricting the amount of rotation, and an assembly groove for allowing the cable to pass when the cable is assembled,
The vehicle seat according to any one of claims 1 to 7, wherein the convex portion is provided adjacent to the assembly groove.

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