JP6227949B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat including a seat cushion and a seat back.

  Conventionally, as a vehicle seat, the back plate is disposed between the left and right side frames of the seat back and the left and right side frames of the seat back, and both end portions thereof are swingable back and forth with respect to the left and right side frames. And a link member for pivoting the back plate and a drive source for pivoting the link member, and pivoting the link member. There is a known configuration in which the back plate is oriented in the turning direction of the vehicle (see Patent Document 1).

JP 2013-49356 A

  By the way, in a vehicle seat, since it is necessary to arrange link members and drive sources in a limited space while suppressing an increase in size, it is desirable that these members themselves and their surroundings have a compact configuration. It is.

The present invention has been made in view of the above background, and an object of the present invention is to provide a vehicle seat that can have a compact configuration around the drive source and the drive source.
Another object of the present invention is to easily fix a drive source to a side frame.
Another object of the present invention is to stably fix a drive source to a side frame.

  In order to achieve the above-described object, the present invention provides a left or right side frame, a movable member movable with respect to the side frame, and a rotatable member with respect to the side frame. A vehicle seat comprising: a link member for causing the link member to be fixed; and a drive source for rotating the link member that is fixed to the side frame. Has a pair of bent portions bent inward in the left-right direction, the drive source is a motor, a gear box that houses a gear for decelerating the rotational drive force generated by the motor, and the reduced rotational drive force The gear box has a fastening portion protruding outward in the radial direction of the output shaft, in which a fastening member for closing an axial end portion of the output shaft is disposed. Shi Wherein the fastening section, viewed from the axial direction of the output shaft, characterized in that it is arranged at a position to avoid a straight line connecting the end portions of the pair of bent portions.

  According to such a structure, since the side surface of the gear box excluding the fastening part has a recessed shape with respect to the fastening part, the drive source including the gear box can be made compact. In addition, since the side surface of the gear box excluding the fastening portion and the end portion of the bent portion of the side frame can be arranged close to each other, an increase in the size of the side frame can be suppressed, and the periphery of the drive source has a compact configuration. be able to.

  In the vehicle seat described above, a plurality of the fastening portions may be provided, and at least one fastening portion may be disposed on each side of the straight line when viewed from the axial direction.

  According to this, even in a configuration having a plurality of fastening portions, the side surface of the gear box excluding the fastening portions and the end portions of the bent portions of the side frames can be arranged close to each other, so that the periphery of the drive source has a compact configuration. Can do.

  The vehicle seat includes a bracket for fixing the drive source to the side frame, and the bracket includes an engagement portion that engages with the one axial end portion of the drive source, and an engagement portion of the engagement portion. A fixing portion that extends along the side frame from the end portion on the side frame side toward the side opposite to the other axial end portion side of the drive source, and is fixed to the side frame. be able to.

  According to this, when the side frame is viewed from the side where the drive source is fixed, since the fixing portion does not overlap the drive source, the bracket can be easily attached to the side frame, and the drive source can be easily attached to the side frame. Can be fixed.

  The vehicle seat includes a bracket for fixing the drive source to the side frame, and the bracket includes an engagement portion that engages with the drive source, and an end of the engagement portion on the side frame side. A fixing portion that extends along the side frame and is fixed to the side frame, and the fixing portion is orthogonal to the axial direction than the driving source when the side frame is viewed from the left-right direction. It has the extension part extended to the outer side of the direction to perform, and can be set as the structure fixed to the said side frame by the said extension part.

  According to this, when the side frame is viewed from the side where the drive source is fixed, the extension portion of the fixed portion does not overlap the drive source, so the bracket can be easily attached to the side frame, and the drive source can be attached to the side frame. Can be easily fixed to the frame.

  In the vehicle seat described above, the side frame is a frame of a seat back, and has a projecting portion projecting toward the front of the upper portion at the lower portion, and at least a part of the projecting portion is the projecting portion. It can be set as the structure arrange | positioned at the part.

  According to this, since it is not necessary to provide the part for arrange | positioning the extension part in a side frame, the structure of a side frame can be simplified. As a result, the periphery of the drive source can be made more compact.

  In the vehicle seat described above, the bracket includes a first bracket and a second bracket each having the engaging portion and the fixing portion, and the engaging portion of the first bracket engages with the gear box. The engaging portion of the second bracket may be fixed to the side frame while being engaged with the motor.

  According to this, the drive source can be stably fixed to the side frame by the first bracket and the second bracket.

  In the vehicle seat described above, the end on the inner side in the left-right direction of the bracket can be configured not to protrude inward in the left-right direction from the end on the inner side in the left-right direction of the drive source when viewed from the axial direction.

  According to this, since the bracket does not jump out to the occupant side, the periphery of the drive source can be made more compact.

  According to the present invention, the drive source can have a compact configuration. In addition, since the gear box and the end of the bent portion of the side frame can be arranged close to each other, an increase in the size of the side frame can be suppressed, and the periphery of the drive source can be made compact.

  According to the present invention, at least one fastening portion is arranged on each side of the straight line connecting the ends of the bent portions, so that the periphery of the drive source can be made compact even in a configuration having a plurality of fastening portions. be able to.

  Further, according to the present invention, the bracket is attached to the side frame by engaging the engaging portion of the bracket with one end portion of the drive source and extending the fixing portion toward the side opposite to the other end portion side. It can be easily attached and the drive source can be easily fixed to the side frame.

  In addition, according to the present invention, the bracket has a configuration in which the fixing portion has an extending portion extending to the outside of the drive source, so that the bracket can be easily attached to the side frame, and the drive source can be easily attached to the side frame. Can be fixed to.

  In addition, according to the present invention, the configuration of the side frame can be simplified by disposing at least a part of the extending portion on the protruding portion of the side frame, and the periphery of the drive source can be configured more compactly. It can be.

  Moreover, according to this invention, a drive source can be stably fixed to a side frame by two 1st brackets and 2nd brackets by comprising a bracket from a 1st bracket and a 2nd bracket.

  Further, according to the present invention, since the bracket is configured such that the left and right inner ends of the bracket do not protrude inward in the left and right direction from the drive source, the bracket does not jump out to the occupant side. It can be.

1 is a perspective view of a vehicle seat as a vehicle seat according to an embodiment. It is a perspective view of a seat frame built in a vehicle seat. It is a front view of the seat back frame which comprises a seat frame. They are the perspective view (a) which shows the connection structure of the side frame of a seat back, and a lower connection wire, and XX sectional drawing (b) of (a). It is a perspective view of the drive mechanism seen from the rear side. It is a perspective view of the drive mechanism seen from the front side. It is a disassembled perspective view of a drive mechanism. It is the side view (a) of a drive source, and YY sectional drawing of (a). It is an enlarged plan view of a drive mechanism. It is sectional drawing of an abutment link member. It is explanatory drawing (a)-(c) of operation | movement of the drive mechanism at the time of right turn. It is explanatory drawing (a)-(c) of operation | movement of the drive mechanism and pressure receiving member at the time of right turn. It is explanatory drawing (a)-(c) of operation | movement of the drive mechanism at the time of a rear collision. It is explanatory drawing (a)-(c) of operation | movement of the drive mechanism and pressure receiving member at the time of a rear collision. It is sectional drawing of the contact link member which concerns on a modification.

Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the vehicle seat according to the present embodiment is configured as a vehicle seat S used for a driver's seat of an automobile, and mainly includes a seat cushion S1, a seat back S2, and a headrest S3. I have.

  A seat frame F as a frame as shown in FIG. 2 is built in the seat cushion S1 and the seat back S2. The seat frame F is mainly composed of a seat cushion frame F1 constituting a frame of the seat cushion S1 and a seat back frame F2 constituting a frame of the seat back S2. The seat cushion S1 is configured by covering the seat cushion frame F1 with a cushion material made of urethane foam or the like and an outer skin material made of synthetic leather or fabric, and the seat back S2 is made up of the cushion material and the seat back frame F2. It is configured by covering the skin material.

  The seat back frame F2 mainly includes an upper frame 10, left and right side frames 20 constituting the left and right frames of the seat back S2, and a lower frame 30. The upper frame 10 and the left and right side frames 20 The lower frame 30 is formed in a frame shape integrally joined by welding or the like.

  The upper frame 10 is made of a pipe material bent into a substantially U shape, and a support bracket 12 for attaching the headrest S3 is fixed to the horizontal pipe portion 11 extending in the left-right direction by welding. The left and right vertical pipe portions 13 extending in the vertical direction of the upper frame 10 are integrally formed with the left and right side frame body portions 21 coupled to the lower portion thereof by welding or the like to form the left and right side frames 20. Yes.

  The left and right side frame main body portions 21 are arranged to face each other in the left-right direction. Each side frame main body 21 has a pair of front and rear bent portions 21A in which both ends in the front-rear direction, which is the short direction, are bent inward in the left-right direction by pressing a metal plate or the like. It is formed in a letter shape. In addition, each side frame main body 21 is coupled to the vertical pipe portion 13 with the vertical pipe portion 13 held at the upper portion thereof, and an overhang portion that protrudes forward from the upper portion to the lower portion thereof. It is formed in a shape having 22.

  As shown in FIG. 3, a pressure receiving member 40 as a movable member and a pair of left and right drive mechanisms 50 are disposed between the left and right side frames 20. Further, the vehicle seat S includes a control device 80 (see FIG. 5) for controlling the drive mechanism 50 (drive source 52) inside or outside thereof.

  The pressure receiving member 40 is a member that receives a load from an occupant seated on the vehicle seat S via a skin material and a cushion material, and is formed so as to be elastically deformable from resin or the like, and a pressure receiving portion 41 that faces the occupant's back. The pressure receiving portion 41 is integrally formed with left and right support portions 42 that extend diagonally forward outward in the left-right direction from the upper left and right ends.

  The pressure receiving member 40 is connected to the left and right side frames 20 so as to be movable back and forth via the upper connecting wire W1 and the lower connecting wire W2. Both ends of the upper connecting wire W1 are connected to the driving mechanism 50 fixed to the side frame 20, and by engaging engaging claws (not shown) formed at the upper part of the rear surface of the pressure receiving member 40, The upper part of the pressure receiving member 40 is connected to the left and right side frames 20. Further, both ends of the lower connecting wire W2 are connected to wire attachment portions 23 (see FIG. 4) provided on the side frames 20, respectively, and an engagement (not shown) formed at the lower portion of the rear surface of the pressure receiving member 40. By engaging the claws, the lower portion of the pressure receiving member 40 is connected to the left and right side frames 20.

  As shown in FIGS. 4A and 4B, the wire attachment portion 23 is formed by bending a metal plate or the like, and the fixing piece 23A is fixed to the left and right sides of the side frame main body portion 21 by welding or screws. It is fixed to the inner surface. The wire attachment portion 23 includes a fixed piece 23A, a connecting piece 23B extending inward in the left-right direction from the upper end portion of the fixed piece 23A, and an engaging piece 23C extending upward from an end portion in the left-right direction of the connecting piece 23B. ing. The engaging piece 23C is formed with a substantially elliptical long hole 23D that is long in the front-rear direction, and the end of the lower connecting wire W2 is engaged with the long hole 23D, whereby the lower connecting wire W2 is It is connected to the side frame 20. In addition, a resin spacer 23E is engaged with the long hole 23D on the front side of the lower connecting wire W2, thereby restricting the lower connecting wire W2 from moving back and forth in the long hole 23D.

  As shown in FIG. 3, the drive mechanism 50 is a mechanism for operating the pressure receiving member 40, is provided on each of the left and right side frames, and is disposed on both the left and right sides of the pressure receiving member 40. As will be described in detail later, the drive mechanism 50 moves the left end or right end of the pressure receiving member 40 from the initial position shown in FIG. 12A to the forward position shown in FIG. Is directed to the right or left, or moved (returns) from the advance position to the initial position. Furthermore, the drive mechanism 50 (the coupling mechanism 51) operates when a predetermined load or more is input to the pressure receiving member 40 from the occupant, and the pressure receiving member 40 is rearward of the initial position shown in FIG. It is configured to move to the retracted position shown in (c).

  As shown in FIG. 5, the drive mechanism 50 mainly includes a connection mechanism 51 connected to the pressure receiving member 40 via the upper connection wire W <b> 1 and a drive source 52 for operating the connection mechanism 51. Has been. Since the left and right drive mechanisms 50 are substantially symmetrical, the following description will be made in detail mainly with reference to the configuration of the left drive mechanism 50.

  As shown in FIGS. 6 and 7, the drive source 52 mainly includes a motor 52 </ b> A, a gear box 52 </ b> B, and an output shaft 52 </ b> C, and is fixed to the side frame 20 via a bracket 60.

The gear box 52B is a member that houses a gear (not shown) for decelerating the rotational driving force generated by the motor 52A. The gear box 52B has a substantially cylindrical box body 310 and an upper end portion of the box body 310 (the axial direction of the output shaft 52C). And a lid member 320 for closing the end portion. Three fastening portions 330 projecting outward in the radial direction of the output shaft 52C are provided on the side surfaces of the box body 310 and the lid member 320. The fastening portions 330 are portions where screws 91 as fastening members for fastening the box main body 310 and the lid member 320 are disposed, and are disposed at equal intervals in the circumferential direction of the side surface of the gear box 52B.
The output shaft 52C is a shaft for outputting the rotational driving force decelerated by the gear box 52B, and is disposed so as to penetrate the lid member 320.

Here, the structure of the bracket 60 for fixing the drive source 52 (drive mechanism 50) to the side frame 20 will be described.
The bracket 60 is composed of a first bracket 61 and a second bracket 62. Each of the first bracket 61 and the second bracket 62 is formed in a substantially L shape in sectional view by bending a metal plate or the like, and mainly includes engaging portions 61A and 62A and fixing portions 61B and 62B. Have.

  The engaging portion 61A of the first bracket 61 is a portion that engages with the upper end portion (lid member 320) of the gear box 52B that is one end portion in the axial direction of the drive source 52, and has a substantially disk shape having a hole for engagement. Is formed. The fixing portion 61B is a portion that is fixed to the side frame 20, and the lower side that is the other end in the axial direction of the drive source 52 from the end on the outer side in the left-right direction (side frame 20 side) of the engaging portion 61A. It is formed so as to extend along the side frame 20 toward the upper side on the opposite side. The fixing portion 61B is provided with a round hole 61H through which a bolt 92 for fixing the first bracket 61 to the side frame 20 is passed.

  The engaging portion 62A of the second bracket 62 is a portion that engages with the motor 52A of the drive source 52, and is formed in a substantially rectangular frame shape. The fixing portion 62B is a portion fixed to the side frame 20, and is formed so as to extend along the side frame 20 from the end portion on the outer side in the left-right direction of the engaging portion 62A toward the lower side. As shown in FIG. 8A, the fixing portion 62B has an extending portion 62C that extends to the outside of the front side (a direction orthogonal to the axial direction) of the drive source 52 when the side frame 20 is viewed from the inside in the left-right direction. doing. The extending part 62C is provided with a round hole 62H (see FIG. 7) through which a bolt 93 for fixing the second bracket 62 to the side frame 20 is passed.

  As shown in FIG. 7, the first bracket 61 is driven when the engaging portion 61A engages with the upper end portion of the gear box 52B and is fastened to the gear box 52B by three bolts 94 (only one is shown). The second bracket 62 is attached to the drive source 52 by engaging the engaging portion 62A with the motor 52A and fastening the second bracket 62 to the gear box 52B with three screws 95 (only one shown). ing. As shown in FIG. 8A, the fixing portion 61B is fixed to the side frame 20 by the bolt 92, and the fixing portion 62B is fixed to the side frame 20 by the bolt 93 by the extension portion 62C. 52 is fixed to the side frame 20.

  In the present embodiment, when the side frame 20 shown in FIG. 8A is viewed from the side where the driving source 52 is fixed, the fixing portion 61B and the extending portion 62C do not overlap the driving source 52 (the driving source 52). Therefore, the bracket 60 can be easily attached to the side frame 20 by the bolts 92 and 93. Thereby, the drive source 52 can be easily fixed to the side frame 20. Further, the drive source 52 can be stably fixed to the side frame 20 by the two first brackets 61 and the second bracket 62.

  The extending portion 62 </ b> C has a front end portion, which is a part of the extending portion 62 </ b> C, disposed on the protruding portion 22 of the side frame 20. Thereby, since it is not necessary to provide the side frame 20 with a special portion for disposing the extending portion 62C protruding forward from the drive source 52, the configuration of the side frame 20 can be simplified. The periphery of the drive source 52 can be made compact.

  As shown in FIG. 8B, the driving source 52 fixed to the side frame 20 via the bracket 60 has three fastening portions 330 as viewed from the axial direction of the output shaft 52C. Are disposed at positions avoiding the straight line L indicated by the alternate long and short dash line connecting the ends of the pair of bent portions 21A. More specifically, the fastening part 330 is arranged at least one on each side of the straight line L as viewed from the axial direction, specifically, one on the outer side in the left-right direction of the straight line L and two on the inner side in the left-right direction of the straight line L. Has been.

  The first bracket 61 (engaging portion 61A) is formed in such a dimension that the end 61E on the inner side in the left-right direction does not protrude inward in the left-right direction from the end 52E on the inner side in the left-right direction of the drive source 52 when viewed from the axial direction. Thereby, since the 1st bracket 61 does not jump out to a passenger | crew side, the periphery of the drive source 52 can be made into a compact structure.

  As shown in FIG. 7, the coupling mechanism 51 is provided so as to be rotatable in the front-rear direction with respect to the side frame 20, and is two link members for operating the pressure receiving member 40, specifically, a drive link member. 100 and the contact link member 200 are mainly included.

  The drive link member 100 is a member formed in a long plate shape from metal or the like, and includes a shaft hole 110 provided at one end portion, a pin hole 120 provided at the other end portion, and a stopper portion 130. Has mainly. The drive link member 100 has a shaft hole 110 connected to the output shaft 52C of the drive source 52 by serration fitting or the like, and is fastened by an E-ring 53 so as not to come out of the output shaft 52C. As a result, the drive link member 100 is provided so as to rotate substantially back and forth when the drive source 52 is driven.

  The stopper portion 130 is a portion that abuts against a member fixed to the side frame 20, specifically, a fixed stopper member 70 described later and restricts the rotation of the drive link member 100 itself. More specifically, the stopper portion 130 includes a first stopper portion 131 that restricts rotation to the side that rotates in front of the drive link member 100 (one direction), and a side that rotates after the drive link member 100 (one 2nd stopper part 132 which regulates rotation to the direction opposite to the direction).

  As shown in FIG. 9, each of the first stopper portion 131 and the second stopper portion 132 is an outer peripheral portion of the drive link member 100 when viewed from the rotation axis direction of the drive link member 100 (the axial direction of the output shaft 52C). In other words, it is provided in the contour portion. Furthermore, the first stopper portion 131 and the second stopper portion 132 are provided on the side surface 102 that surrounds the output shaft 52 </ b> C that is the rotation shaft of the drive link member 100. Specifically, the first stopper portion 131 is directed substantially forward from the front side of the elongated body portion 101 when the drive link member 100 is in the posture shown in FIG. 9 (when the pressure receiving member 40 is in the initial position). The surface which protrudes and contacts the fixed stopper member 70 is provided so as to be substantially flat. Further, the second stopper portion 132 is provided so as to protrude substantially leftward from the rear side of the main body portion 101 and have a substantially flat surface in contact with the fixed stopper member 70.

Here, the configuration of the fixed stopper member 70 will be described.
The fixed stopper member 70 is a member that restricts the rotation of the drive link member 100 when the stopper portion 130 abuts, and is fixed to the side frame 20. More specifically, the fixed stopper member 70 is disposed between the output shaft 52C and the side frame 20, and is opened inward in the left-right direction, which is the side where the drive link member 100 is disposed, when viewed from the axial direction of the output shaft 52C. It has a U shape. The fixed stopper member 70 is fixed to the side frame 20 via the first bracket 61 by fixing a base portion 72 opposite to the U-shaped end portion 71 to the first bracket 61 by welding or the like.

  The fixed stopper member 70 has a rotation restricting portion 73 with which the stopper portion of the drive link member 100 can abut on the end portion 71. Each rotation restricting portion 73 has a substantially rectangular cylindrical shape that can be engaged with the end portion 71 and is made of resin. The drive link member 100 is restricted from turning forward by the first stopper 131 coming into contact with the front turning restricting portion 73 (see FIG. 11C), and the second stopper. When the part 132 is in contact with the rear side rotation restricting part 73, the rotation to the side to be rotated later is restricted. Since the rotation restricting portion 73 is formed of resin, the contact noise between the stopper portion 130 and the fixed stopper member 70 can be suppressed, and the operation sound of the drive link member 100 can be suppressed.

  Further, each rotation restricting portion 73 is disposed within a substantially circular outline of the drive source 52 when viewed from the axial direction of the output shaft 52C. Thereby, since the enlargement of the drive link member 100 which has the stopper part 130 which can contact | abut to the rotation control part 73 in the side surface 102 can be suppressed, the drive link member 100 can be made into a compact structure.

  The output shaft 52C is disposed to face the opening 74 of the U-shaped fixed stopper member 70 when viewed from the axial direction. Thereby, since the drive link member 100 and the fixed stopper member 70 can be disposed close to the left and right direction, the periphery of the drive link member 100 can be made compact.

  The stopper portion 130 has a length from the rotation center C1 to the rotation center C2 of the abutment link member 200 with the rotation center C1 of the drive link member 100 as the center, as viewed from the axial direction of the output shaft 52C. It arrange | positions inside the circle C shown with the dashed-dotted line made into a radius. Thereby, since the enlargement of the drive link member 100 can be suppressed, the drive link member 100 can have a compact configuration.

  In the present embodiment, the left and right drive link members 100 are composed of common parts. Specifically, the drive link member 100 constituting the left drive mechanism 50 shown in FIG. 9 is configured so that the right drive mechanism 50 can also be used by reversing the front and back sides. This configuration is possible because the stopper portion 130 is not provided on the side surface 102 of the plate-like drive link member 100 and protrudes only on one side in the axial direction. is there. By sharing parts, it is possible to reduce the number of parts and the trouble of parts management, so that the cost can be reduced. Further, it is possible to prevent the right and left parts from being mixed and to facilitate assembly.

  As shown in FIG. 7, the contact link member 200 is a member formed in an elongated shape, and includes a stopper 210 and a pin hole 220 provided at one end portion, and a contact portion 230 provided at the other end portion. And a through-hole 240 provided between the pin hole 220 and the contact portion 230. The contact link member 200 is provided so as to be able to rotate substantially forward and backward with respect to the drive link member 100 by engaging the pin 54 with the pin hole 220 and the pin hole 120 of the drive link member 100. Further, the contact link member 200 is connected to the pressure receiving member 40 via the upper connection wire W1 by inserting the end portion of the upper connection wire W1 into the through hole 240.

  The contact portion 230 is a portion that contacts the pressure receiving member 40 when the pressure receiving member 40 is operated by the drive source 52. As shown in FIG. 9, the contact portion 230 has a convex curved surface shape when viewed from the rotation axis direction of the contact link member 200, and further, a direction orthogonal to the rotation axis direction as shown in FIG. 10. As seen from the above, it has a convex curved surface shape. More specifically, the contact portion 230 has a substantially spherical shape.

  The pressure receiving member 40 has a gap with the contact portion 230 when no load is input from the occupant at the initial position indicated by the solid line in FIG. 9 (when no occupant is seated on the vehicle seat S). When the occupant is seated on the vehicle seat S and a load is input from the occupant at the initial position, the support portion 42 is deformed as indicated by a two-dot chain line to the contact portion 230. Abut. As a result, the pressure receiving member 40 can be deformed and moved until the pressure receiving member 40 hits the contact portion 230, so that the cushioning property of the seat back S2 can be improved. The pressure receiving member 40 has a contacted surface 43 with which the contact portion 230 can contact the rear surface of the support portion 42, and the contacted surface 43 is a rotation shaft of the contact link member 200. It has a concave curved surface shape when viewed from the direction.

  The stopper 210 is a part that abuts against the side surface 102 of the drive link member 100 and regulates the amount of rotation to the side that rotates after the contact link member 200 (see FIGS. 11C and 13C). . The stopper 210 protrudes from one end portion of the contact link member 200 and is bent from the tip of the protruding portion to the lower side where the drive link member 100 is disposed.

  As shown in FIG. 10, the abutment link member 200 includes a link body 201 formed in a long plate shape and a covering member 202 that covers the entire link body 201. The link body 201 and the covering member 202 are formed of different materials. Specifically, in the abutment link member 200, the link main body 201 is formed of metal and the covering member 202 is formed of resin by insert molding or the like. The through hole 240 is provided so as to penetrate the link body 201 and the covering member 202. The contact portion 230 is provided on the covering member 202 and is configured as a part of the covering member 202. Thereby, the contact part 230 is formed from resin.

  As shown in FIG. 9, the contact link member 200 is formed such that the length from the rotation center C2 to the contact portion 230 is longer than the length from the rotation center C2 to the rotation center C1 of the drive link member 100. Has been.

  As shown in FIGS. 6 and 7, a torsion spring 55 as an urging member is disposed between the drive link member 100 and the contact link member 200. The torsion spring 55 is a member that biases the abutting link member 200 forward (one direction), and extends outward in the radial direction from the upper end of the coil portion 55A and the coil portion 55A. It has a substantially L-shaped first arm portion 55B that extends, and an L-shaped second arm portion 55C that extends radially outward from the lower end of the coil portion 55A and extends downward.

  In the torsion spring 55, the coil portion 55A is engaged with the pin 54, and as shown in FIG. 9, the first arm portion 55B, which is one end thereof, is hooked on the first stopper portion 131 of the drive link member 100, and the other end The second arm portion 55 </ b> C is hooked on the stopper 210 of the contact link member 200. Thereby, the torsion spring 55 generates an urging force for rotating the contact link member 200 in the direction indicated by the arrow in FIG.

  The torsion spring 55 and the upper connecting wire W1 as the connecting wire are members that restrict the rearward rotation of the abutment link member 200, in other words, members that serve as resistance to the rearward rotation (rotation resistance member). It is functioning. Specifically, the torsion spring 55 urges the contact link member 200 toward the front rotation side, thereby restricting the contact link member 200 from rotating backward.

  The upper connecting wire W1 is bent at both left and right end portions obliquely forward, and the end portion extending downward is connected to the through hole 240 of the contact link member 200. The contact link member 200 is connected. And the connection part C3 of the contact link member 200 and the pressure receiving member 40 is arrange | positioned ahead of the rotation center C2 of the contact link member 200 in the state in which the pressure receiving member 40 exists in the initial position shown in FIG. Thus, the upper connecting wire W1 biases the abutting link member 200 toward the front pivoting side, thereby restricting the abutting link member 200 from pivoting backward.

  The connecting portion C3 is disposed inside a circle C indicated by a one-dot chain line when the pressure receiving member 40 is in the initial position shown in FIG. 9 when viewed from the rotation axis direction of the contact link member 200. Further, the connecting portion C3 is disposed on the outer side in the left-right direction with respect to the rotation center C2 of the contact link member 200 in a state where the pressure receiving member 40 is in the initial position.

  The drive mechanism 50 described above is provided so that the left and right operate independently of each other. Specifically, the drive source 52 is controlled by the control device 80 so that the left and right are driven independently of each other, and the drive link member 100 and the contact link member 200 of the coupling mechanism 51 are independent of each other on the left and right. It is provided so that rotation is possible. That is, in the drive mechanism 50, for example, when the left drive link member 100 and the contact link member 200 rotate, the right drive link member 100 and the contact link member 200 also rotate in conjunction with each other. It is not configured.

  As shown in FIG. 5, the control device 80 is configured to turn the pressure receiving member 40 in the seat back S2 in the turning direction by controlling the drive of the drive source 52 (motor 52A) (FIG. 5). 12 (c)). Various methods can be adopted as the control method by the control device 80. For example, the lateral acceleration and the turning direction are calculated based on signals from the wheel speed sensor and the steering angle sensor, and the calculated lateral acceleration has a predetermined threshold value. When exceeding, the motor 52A of the drive mechanism 50 outside the turning direction is driven, and thereby the direction of the pressure receiving member 40 is directed to the turning direction.

  In the present embodiment, the control device 80 monitors the current flowing through the motor 52A while the motor 52A is being driven, and stops energization of the motor 52A when the current flowing through the motor 52A exceeds a predetermined value set in advance. Thus, the driving of the motor 52A is stopped. When the drive link member 100 rotates and the stopper portion 130 comes into contact with the fixed stopper member 70, the motor 52A stops and the current flowing through the motor 52A increases. The control device 80 stops energization of the motor 52A by detecting this state. Thereby, the stopper part 130 can be made to function suitably with a simple structure, and the rotation amount of the drive link member 100 can be prescribed | regulated accurately.

Next, operations of the drive mechanism 50 and the pressure receiving member 40 when the vehicle is turning will be described.
When the vehicle turns to the right, the control device 80 drives the drive source 52 of the left drive mechanism 50. Then, from the state shown in FIG. 11A, as shown in FIGS. 11B and 11C, the drive link member 100 rotates forward, and the abutment link member 200 moves relative to the drive link member 100. Move forward while rotating. As a result, the left end portion (connecting portion C3) of the upper connecting wire W1 moves forward, and the left support portion 42 (left end portion) of the pressure receiving member 40 is moved from the initial position to the forward advance position.

  Then, when the first stopper portion 131 of the drive link member 100 abuts against the rotation restricting portion 73 on the front side of the fixed stopper member 70, the rotation of the drive link member 100 is restricted, and the stopper 210 of the contact link member 200. Is brought into contact with the side surface 102 of the drive link member 100, whereby the rotation of the contact link member 200 is restricted. At this time, since the current flowing through the drive source 52 exceeds a predetermined value, the control device 80 stops the drive of the drive source 52.

  Accordingly, as shown in FIGS. 12A to 12C, the pressure receiving member 40 turns to the right as a turning direction as a whole when the left end portion moves from the initial position to the advanced position. As a result, the centrifugal force applied to the occupant during turning can be suitably supported by the seat back S2.

  In this embodiment, since the coupling mechanism 51 is composed of two drive link members 100 and a contact link member 200, the upper link wire W1 is attached to one link member, for example, the drive link member 100 shown in FIG. Compared to the case of directly connecting and moving the pressure receiving member 40 back and forth, the amount of stroke before and after the left end portion of the upper connecting wire W1 can be increased. Thereby, since the movement amount (inclination amount) of the pressure receiving member 40 can be ensured, the centrifugal force applied to the occupant by the pressure receiving member 40 during turning can be better supported.

  In the present embodiment, the connecting portion C3 is disposed on the outer side in the left-right direction with respect to the rotation center C2 with the pressure receiving member 40 in the initial position, and the contact link member 200 is moved forward by the upper connecting wire W1 or the like. Since it is urged | biased by the side to rotate, the contact link member 200 becomes difficult to rotate back. Thereby, when the pressure receiving member 40 is moved from the initial position to the advanced position, the tip end of the contact link member 200 does not fluctuate, so that the pressure receiving member 40 can be moved stably.

  When the vehicle returns from the turning state to the straight traveling state, the control device 80 drives the drive source 52 of the left drive mechanism 50 in the direction opposite to that during turning. Then, as shown in FIGS. 11B and 11A, the drive link member 100 rotates backward from the state shown in FIG. Then, the contact link member 200 moves backward while rotating with respect to the drive link member 100 due to a load applied to the pressure receiving member 40 from the occupant. As a result, the left end portion of the upper connecting wire W1 moves rearward, and the left support portion 42 of the pressure receiving member 40 is moved from the advance position to the initial position.

  The rotation of the drive link member 100 is restricted by the second stopper portion 132 of the drive link member 100 coming into contact with the rotation restricting portion 73 on the rear side of the fixed stopper member 70. At this time, since the current flowing through the drive source 52 exceeds a predetermined value, the control device 80 stops the drive of the drive source 52. As a result, the pressure receiving member 40 returns from the state facing right as shown in FIG. 12C to the state facing forward as shown in FIG.

  On the other hand, when the vehicle turns to the left, the control device 80 drives the drive source 52 of the right drive mechanism 50. Subsequent operations of the pressure receiving member 40 and the right driving mechanism 50 are the same as in the case of right-turning, and thus detailed description thereof is omitted.

  In the present embodiment, the pressure-receiving member 40 has the contact surface 43 abutted against the contact portion 230 after an occupant sits on the vehicle seat S and contacts the contact portion 230 of the contact link member 200. It arrange | positions so that it may contact | abut in the whole range of the rotation range of the contact link member 200. FIG. Accordingly, the rotation of the contact link member 200 is guided by the pressure receiving member 40, so that the contact link member 200 can be operated smoothly.

  Moreover, in this embodiment, since the contact part 230 and the pressure receiving member 40 are formed from resin, the sliding contact sound and abrasion with the contact link member 200 and the pressure receiving member 40 can be suppressed. Furthermore, since the contacted surface 43 has a concave curved surface shape, the contact pressure between the contact portion 230 and the contacted surface 43 is lowered, so that the wear of the contact link member 200 and the pressure receiving member 40 is further suppressed. Can do.

  Next, the operation of the drive mechanism 50 and the pressure receiving member 40 at the time of rear collision will be described. Here, the time of a rear collision is a time when another vehicle collides with the rear part of the host vehicle or when the rear part of the host vehicle that moves backward collides with another vehicle or a structure.

  As shown in FIG. 13 (a), when the pressure receiving member 40 is in the initial position and the rear collision does not occur, it is normal (when a load less than a predetermined value is input from the occupant to the pressure receiving member 40). Since the rearward rotation of the contact link member 200 is restricted by the connecting wire W1 or the like, the pressure receiving member 40 does not move greatly backward from the initial position.

  On the other hand, when a rear collision occurs and a large load greater than or equal to a predetermined value is input to the pressure receiving member 40 from the occupant, the pressure receiving member 40 moves rearward due to the large load, and the end of the upper connecting wire W1 is brought into contact with the contact link member 200 (connecting part C3) is pulled backward. Then, as shown in FIG. 13B, the abutment link member 200 rotates backward while elastically deforming the upper connecting wire W1 and the pressure receiving member 40 inward in the left-right direction, whereby the pressure receiving member 40 is further rearward. To move from the initial position to the retracted position shown in FIG. Then, when the pressure receiving member 40 moves to the retracted position, the stopper 210 of the contact link member 200 contacts the side surface 102 of the drive link member 100, whereby the rotation of the contact link member 200 is restricted, and the pressure receiving member 40. This also restricts the backward movement.

  As shown in FIGS. 14A to 14C, when the pressure receiving member 40 moves from the initial position to the retracted position, the upper body of the occupant sinks into the seat back S2. As a result, the head of the occupant can be quickly brought close to the headrest S3 and received by the headrest S3, so that the impact applied to the occupant's neck during a rear-end collision can be reduced.

  In this embodiment, when the contact link member 200 includes the stopper 210, it is possible to prevent the contact link member 200 from rotating too far backward. Thereby, for example, it is possible to adjust the sinking amount of the occupant into the seat back S2, and to easily return the pressure receiving member 40 moved to the retracted position to the initial position.

  As shown in FIG. 13C, the connecting portion C3 is disposed behind the rotation center C2 of the contact link member 200 in a state where the pressure receiving member 40 is in the retracted position. At this time, the upper connecting wire W1 functions as a member that urges the contact link member 200 in the direction indicated by the arrow, specifically, a member (second urging member) that urges the contact link member 200 toward the side that rotates later. To do. Thereby, since the pressure receiving member 40 moved to the retracted position by the rear collision can be kept at the retracted position, it is possible to suppress the pressure receiving member 40 from moving forward due to the reaction when moving to the retracted position.

  According to the vehicle seat S described above, the drive mechanism 50 changes the direction of the pressure receiving member 40 when turning and supports the occupant appropriately, and the occupant moves the pressure receiving member 40 to the retracted position during a rear collision. Both functions of mitigating the applied impact can be realized. This eliminates the need to provide both a mechanism for changing the direction of the pressure receiving member and a mechanism for enabling the pressure receiving member to move backward in the seat back S2, thereby securing a space in the seat back S2 and arranging other mechanisms. Or the vehicle seat S can be made compact, and the degree of freedom in designing the vehicle seat S can be improved.

  Further, by providing the upper connecting wire W1 or the torsion spring 55 as a rotation resistance member that serves as a resistance to the rearward rotation of the contact link member 200, it is possible to suppress the pressure receiving member 40 from moving to the retracted position at the normal time. can do.

  Further, since the connecting portion C3 is disposed inside the circle C with the pressure receiving member 40 in the initial position, the deformation amount of the upper connecting wire W1 when the pressure receiving member 40 moves to the retracted position is reduced, The enlargement of the upper connecting wire W1 can be suppressed.

  Further, since the contact portion 230 having a convex curved surface shape when viewed from the rotation axis direction is provided at the tip of the contact link member 200, the contact portion 230 and the pressure receiving member in the rotation direction of the contact link member 200 are provided. And the contact link member 200 and the pressure receiving member 40 can be operated smoothly during turning and rear collision. Further, since the contact portion 230 has a convex curved surface shape when viewed from the direction orthogonal to the rotation axis direction, the sliding resistance can be reduced also in the rotation axis direction of the contact link member 200. For example, the pressure receiving member 40 The pressure receiving member 40 and the like can be operated smoothly when the valve moves up and down. Furthermore, since the abutting portion 230 has a substantially spherical shape, the sliding resistance can be reduced in all directions, and when the abutting link member 200 and the pressure receiving member 40 abut on each other, the abutting link member 200 or the like is performed. It can be operated smoothly.

  Further, since the upper connection wire W1 is connected to the contact link member 200 by being inserted through the through hole 240, the contact link member 200 and the upper connection wire W1 can be easily connected.

  Also, as shown in FIG. 11, the drive link member 100 has a stopper portion 130, and the stopper portion 130 abuts on the fixed stopper member 70, thereby restricting the rotation of the drive link member 100. Compared with the configuration in which the rotation amount of the link member is defined by driving and stopping the stepping motor, the rotation amount of the drive link member 100 can be defined with high accuracy. Further, the amount of rotation of the drive link member 100 can be accurately defined with a simple and low-cost configuration as compared with the case of using a stepping motor. Moreover, since the stopper part 130 has the 1st stopper part 131 and the 2nd stopper part 132, in the case where both the case where the drive link member 100 rotates in one direction, and the case where it rotates in a reverse direction, the rotation amount Can be defined with high accuracy.

  Further, since both the drive mechanism 50 (drive link member 100) and the fixed stopper member 70 are fixed to the bracket 60, the positional accuracy between the stopper portion 130 and the fixed stopper member 70 can be improved, and the drive link member The amount of rotation of 100 can be defined with higher accuracy.

  In addition, since the fixed stopper member 70 is disposed between the output shaft 52C and the side frame 20, an increase in size of the drive link member 100 or the fixed stopper member 70 can be suppressed, and the periphery of the drive link member 100, specifically, The configuration for defining the rotation of the drive link member 100 can be a compact configuration. In addition, since the length of the protruding stopper portion 130 can be shortened because the drive link member 100 and the configuration for defining the rotation can be made compact, the load when the stopper portion 130 contacts the fixed stopper member 70 can be reduced. can do.

  Moreover, since the stopper part 130 is provided in the side surface 102 of the drive link member 100, the structure of the drive link member 100 can be simplified compared with the structure in which the stopper part protrudes from the link member in the rotation axis direction. . Further, since the first arm portion 55B of the torsion spring 55 is hooked to the first stopper portion 131, compared with a configuration in which a portion for hooking the torsion spring is provided at a location different from the stopper portion, The configuration of the drive link member 100 can be simplified. As a result, the drive link member 100 can be easily manufactured.

  Further, as shown in FIG. 8B, in the gear box 52 </ b> B, the fastening portion 330 protrudes, so that the side surface of the gear box 52 </ b> B excluding the fastening portion 330 is recessed with respect to the fastening portion 330. Therefore, the drive source 52 including the gear box 52B can be made compact. Further, since the protruding fastening portion 330 is arranged at a position avoiding the straight line L, the side surface of the gear box 52B excluding the fastening portion 330 and the end portion of the bent portion 21A of the side frame 20 can be placed close to each other. Therefore, the enlargement of the side frame 20 can be suppressed, and the periphery of the drive source 52 can be made compact. Further, by arranging two fastening portions 330 on the outer side in the left-right direction of the straight line L and two on the inner side in the left-right direction of the straight line L, the side surface of the gear box 52B and the bent portion 21A can be provided even in a configuration having a plurality of fastening portions 330 Since the end portions can be arranged close to each other, the periphery of the drive source 52 can be made compact.

  Although the embodiment has been described above, the present invention is not limited to the embodiment. About a concrete structure, it can change suitably in the range which does not deviate from the meaning of invention as follows.

  In the above-described embodiment, the stopper 210 that regulates the amount of rotation of the contact link member 200 is provided on the contact link member 200 itself. However, the present invention is not limited thereto, and the stopper may be, for example, a drive link member, a bracket, or a side. It may be provided on a frame or the like.

  In the embodiment, the contact link member 200 is provided so that the covering member 202 covers the entire link body 201, but is not limited thereto. For example, as shown in FIG. 15, the covering member 202 may be provided so as to cover only a part of the link body 201. Supplementally, the abutting link member 200 shown in FIG. 15 is attached so that one end portion of the metal link body 201 is covered with the resin covering member 202 provided with the abutting portion 230. Yes. In such a configuration, it is possible to prevent the covering member 202 from falling off by inserting the upper connecting wire W <b> 1 into the through hole 240 that penetrates the link main body 201 and the covering member 202. Further, in the contact link member 200 shown in FIG. 15, the minimum diameter of the through hole 242 of the covering member 202 is formed smaller than the minimum diameter of the through hole 241 of the link body 201. As a result, the upper connecting wire W1 inserted through the through-hole 240 hits the inner peripheral surface of the through-hole 242 of the resin-made covering member 202, so that the contact sound between the contact link member 200 and the upper connecting wire W1 is reduced. Occurrence can be suppressed.

  In the embodiment, the contact link member 200 includes the link main body 201 and the covering member 202, and the link main body 201 and the covering member 202 are formed of different materials. However, the present invention is not limited to this. For example, the contact link member may be entirely formed of resin. Note that, as in the above-described embodiment, the contact link member 200 includes the link body 201 and the covering member 202 provided with the contact portion 230, so that the link body 201 and the covering member 202 are provided. Each of these can be formed from materials that are optimal in function. For example, as in the above-described embodiment, the link main body 201 is made of metal and the covering member 202 is made of resin, so that the rigidity of the entire contact link member 200 is secured and the contact link member 200 and the pressure receiving member 40 are secured. It is possible to suppress the sliding contact noise and to suppress wear.

  In the embodiment, the contact portion 230 has a substantially spherical shape. However, the present invention is not limited thereto. For example, the contact portion has a convex curved surface shape only when viewed from the rotation axis direction of the link member. It may be a simple configuration. Moreover, the cross-sectional shape of the contact portion is not limited to a circular shape (arc shape), and may be an oval shape or an elliptical shape.

  In the above-described embodiment, the stopper 130 of the drive link member 100 is configured to abut against the fixed stopper member 70 fixed to the side frame 20 to restrict the rotation of the drive link member 100. However, the present invention is not limited to this. Is not to be done. For example, the stopper portion may be configured to directly contact the side frame and restrict the rotation of the link member.

  In the above-described embodiment, the stopper portion 130 is provided on the side surface 102 of the drive link member 100. However, the present invention is not limited to this. For example, the stopper portion is provided so as to protrude from the drive link member in the rotation axis direction. It may be. Moreover, in the said embodiment, although the stopper part 130 had the two 1st stopper parts 131 and the 2nd stopper part 132, it is not limited to this, For example, the stopper part may be one. . Moreover, in the said embodiment, although the drive link member 100 was comprised as a common component by right and left, it is not limited to this, You may be comprised as a left or right exclusive component.

  In the embodiment, the fixed stopper member 70 is fixed to the bracket 60. However, the present invention is not limited to this. For example, the fixed stopper member may be directly fixed to the side frame. Moreover, in the said embodiment, although the whole rotation control part 73 was formed from resin, it is not limited to this, For example, only the surface with which the stopper part of a drive link member contact | abuts a rotation control part is resin. It may be formed from. Also by this, since the contact sound between the stopper portion and the rotation restricting portion can be suppressed, the operation sound of the drive link member can be suppressed.

  In the embodiment, the torsion spring 55 is exemplified as the urging member. However, the urging member is not limited to this, and may be a leaf spring, for example. Moreover, in the said embodiment, although the upper connection wire W1 was illustrated as a 2nd biasing member, it is not limited to this, For example, a coil spring etc. may be sufficient. In the above embodiment, the upper connecting wire W1 and the torsion spring 55 are exemplified as the rotation resistance member, but the present invention is not limited to this. For example, the urging member, the second urging member, and the rotation resistance member are independent of each other. Another member may be used.

  In the embodiment, a part of the extension part 62C of the second bracket 62 fixed to the side frame 20 is disposed on the extension part 22 of the side frame 20. However, the present invention is not limited to this. The entire portion may be disposed on the overhang portion 22.

  The configuration of the bracket 60 shown in the embodiment is an example. For example, in the embodiment, the fixing portion 62B of the second bracket 62 has the extending portion 62C. However, the present invention is not limited to this, and the fixing portion of the first bracket may have the extending portion. . 8A, the engaging portion 62A of the second bracket 62 is engaged with the lower end portion of the drive source 52, and the fixed portion 62B extends below the drive source 52. May be. Moreover, in the said embodiment, although the bracket 60 was comprised from the two 1st bracket 61 and the 2nd bracket 62, it is not limited to this, One bracket may be sufficient.

  In the above-described embodiment, the coupling mechanism 51 is configured to include two links (the drive link member 100 and the abutment link member 200). However, the present invention is not limited to this. For example, the connection mechanism may be configured with one link member, or may be configured with three or more link members.

  In the said embodiment, although the pressure receiving member 40 was illustrated as a movable member, it is not limited to this. For example, the movable member may be a side support member that is provided such that the front end portion thereof is swingable left and right with respect to the side frame of the seat back, and supports the upper body of the occupant from both the left and right sides via a cushion material or the like. . Moreover, in the said embodiment, although the movable member and the drive mechanism 50 were arrange | positioned in seat back S2, it is not limited to this, For example, a movable member and a drive mechanism may be arrange | positioned in a seat cushion. .

  In the above-described embodiment, an example in which the present invention is applied to a seat (vehicle seat S) used in an automobile has been described. However, the present invention is not limited thereto, and is used in other vehicles such as a railway vehicle, a ship, and an aircraft. It can also be applied to a sheet to be processed.

20 Side frame 21A Bent part 22 Overhang part 40 Pressure receiving member 52 Drive source 52A Motor 52B Gear box 52C Output shaft 52E End 60 Bracket 61 First bracket 61A Engaging part 61B Fixing part 61E End 62 Second bracket 62A Engaging part 62B Fixed part 62C Extension part 91 Screw 100 Drive link member 200 Contact link member 330 Fastening part S Vehicle seat S2 Seat back

Claims (7)

A left or right side frame, a movable member movable with respect to the side frame, a link member provided to be rotatable with respect to the side frame, and for operating the movable member, and with respect to the side frame A vehicle seat provided with a drive source for rotating the link member,
The side frame has a pair of bent portions in which both ends in the short direction are bent inward in the left-right direction,
The drive source includes a motor, a gear box that houses a gear for decelerating the rotational driving force generated by the motor, and an output shaft that outputs the reduced rotational driving force.
The gear box has a fastening portion protruding outward in the radial direction of the output shaft, in which a fastening member for closing an axial end portion of the output shaft is disposed,
The vehicle seat according to claim 1, wherein the fastening portion is disposed at a position avoiding a straight line connecting the ends of the pair of bent portions when viewed from the axial direction of the output shaft.   2. The vehicle seat according to claim 1, wherein a plurality of the fastening portions are provided, and at least one fastening portion is disposed on each side of the straight line when viewed from the axial direction. A bracket for fixing the drive source to the side frame;
The bracket includes an engaging portion that engages with the one end portion in the axial direction of the drive source, and an end portion on the side frame side of the engaging portion that is opposite to the other axial end portion side of the drive source. The vehicle seat according to claim 1, further comprising: a fixing portion that extends along the side frame toward the side and is fixed to the side frame. A bracket for fixing the drive source to the side frame;
The bracket includes an engaging portion that engages with the driving source, and a fixing portion that extends along the side frame from an end portion of the engaging portion on the side frame side and is fixed to the side frame. And
The fixing portion has an extending portion that extends to the outside in a direction orthogonal to the axial direction from the driving source when the side frame is viewed from the left-right direction, and is fixed to the side frame by the extending portion. The vehicle seat according to any one of claims 1 to 3, wherein the vehicle seat is provided. The side frame is a seat back frame, and has a projecting portion projecting toward the front of the upper part at the lower part,
The vehicle seat according to claim 4, wherein at least a part of the extending portion is disposed in the overhanging portion.   The bracket includes a first bracket and a second bracket each having the engagement portion and the fixing portion, and the engagement portion of the first bracket engages with the gear box, and the engagement of the second bracket. The vehicle seat according to any one of claims 3 to 5, wherein a joint portion is fixed to the side frame in a state of being engaged with the motor.   The left-right inner end of the bracket does not protrude inward in the left-right direction from the left-right inner end of the drive source when viewed from the axial direction. Vehicle seat described in 1.

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