JP2012240554A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently secure reclining strength by reclining a seat back through motor driving between a forward reclining position and a backward reclining position.SOLUTION: In a rear seat 10, a sector gear 88 is rotated in a forward direction or backward direction if the motor 74 is driven when a lock mechanism 44 is unlocked. In this instance, the seat back is reclined forward or backward by allowing a bracket 34 at the seat back side to be rotated. This allows the seat back to be reclined by driving the motor 74 not only between the use position and forward reclining position but also between the use position and backward reclining position. Further, the seat back is locked not to be reclined by the lock mechanism 44 after the seat back is reclined between the use position and backward reclining position. As a result, the seat back is held by the lock mechanism 44. This sufficiently secures the reclining strength of the seat back.

Description

  The present invention relates to a vehicle seat in which a seat back is tilted by driving of a motor.

  In the seat device disclosed in Patent Document 1 below, the lock mechanism provided in the reclining device is locked so that the seat back cannot be tilted at the reclining position. Thereby, in this seat apparatus, since a seat back is held by a lock mechanism part, there is an advantage that sufficient reclining strength can be secured against a load acting on the seat back.

  Further, in this seat device, when the lock mechanism is unlocked, the seat back is tilted from the use position (standing position) to the forward tilt position by the urging force of the spiral spring. On the other hand, when the seat back is raised from the forward tilt position to the use position, the seat back is returned to the use position by driving the motor of the rotating device (return mechanism). As a result, this seat device can be remotely operated to return the seat back from the forward tilt position to the use position, and there is an advantage that convenience can be improved.

  However, in this seat device, when the seat back is moved forward, the seat back is accelerated by its own weight in addition to the urging force of the spiral spring. Accordingly, there is a problem that the tilting speed when the seat back is tilted forward is increased.

  Some vehicle seat devices include a so-called power reclining mechanism that can tilt a seat back backward from a use position by driving a motor and tilt the seat back to a reclining position (see Patent Document 2). In the seat apparatus provided with this power reclining mechanism, the seat back can be tilted to the reclining position by driving the motor, and there is an advantage that convenience can be improved.

  On the other hand, the seat device provided with the power reclining mechanism does not include a lock mechanism portion like the above-described seat device, and the seat back at the reclining position is held by the power reclining mechanism. For this reason, it is necessary for the power reclining mechanism to have a reclining strength that can withstand the load acting on the seat back.

By the way, in the rear seat, the distance in the seat width direction between the seat belt device arranged at the upper part of the seat back and the belt anchor of the vehicle is greater in the center seat in the seat width direction than in the both side seats in the seat width direction. Is set larger. As a result, the load acting on the seat back at the center seat of the rear seat is greater than the load acting on the seat back at the seats on both sides of the rear seat. For this reason, the center seat of the rear seat needs to have a reclining strength equivalent to that of the reclining device described above.

However, since the power reclining mechanism does not have the same reclining strength as the reclining device, it is difficult to apply the power reclining mechanism to the center seat of the rear seat.

  As described above, it is preferable that the vehicle seat device can suppress an increase in the tilting speed when the vehicle is tilted forward while providing the advantages of both the above-described seat devices.

JP 2007-7386 A JP 2001-149162 A

  In consideration of the above-described facts, an object of the present invention is to provide a vehicle seat in which a seat back can be tilted by driving a motor between a front-falling position and a rear-falling position, and a sufficient reclining strength can be secured.

  The vehicle seat according to claim 1 is tiltable between a use position and a front-falling position and between the use position and a rear-falling position with respect to the seat cushion, and a seat cushion connected to a vehicle body. A configured seat back, a lock mechanism having a release mechanism for locking the seat back in a tiltable manner between the use position and the rearward tilt position, and releasing the lock, and rotatably supported by the vehicle body And a rotating member that is connected to the seat back and tilts the seat back by rotating, a motor that generates a rotating force by driving, the motor, and the rotating force of the motor connected to the rotating member. And a transmission portion that transmits the motor to the rotating member, and drives the motor when the lock of the lock mechanism is released by the release mechanism. And a driving mechanism for tilting between the rear inclination position and between said use position and said rotary member is rotated falling forward the said use position the seat back position by.

  In the vehicle seat according to claim 1, the seat back is not tilted by the lock of the lock mechanism between the use position and the rearward tilt position, and the lock of the lock mechanism is released by the release mechanism. So the seat back can be prone. Further, a rotating member is connected to the seat back, and the rotating member is connected to a motor of the drive mechanism via a transmission part of the drive mechanism.

  Here, when the lock of the lock mechanism is released, the rotation mechanism is rotated by driving the motor of the drive mechanism, so that the seat back is between the use position and the front tilt position, and between the use position and the rear tilt position. Tilt between. As a result, the seat back is tilted by driving the motor between the forward-falling position and the backward-falling position. Furthermore, after the seat back is tilted between the use position and the rearward tilt position, the seat back is locked by the lock mechanism so as not to tilt, so that the reclining strength is sufficiently ensured.

  The vehicle seat according to claim 2 is the vehicle seat according to claim 1, wherein the vehicle seat forms a part of the transmitting portion and projects from the rotating member, and engages with the projecting pin. And a rotating body that has an engaging groove for connecting the transmission portion to the rotating member and rotates the rotating member by being rotated by driving of the motor.

  In the vehicle seat according to claim 2, the rotating body is provided in the drive mechanism, and the transmission portion is coupled to the rotating member by engaging the engaging groove of the rotating body with the protruding pin of the rotating member. . And a rotating member is rotated because a rotary body is rotated by the drive of a motor. Thus, by providing an engagement groove that engages with the projecting pin in the rotating body, for example, while using a reclining device that tilts the conventional seat back, the seat back is moved forward and backward by driving the motor. Can tilt between.

  According to a third aspect of the present invention, there is provided a vehicle seat according to the second aspect, wherein the drive mechanism detects a tilt of the seat back toward the use position by being pressed. A rearward tilt position detection switch that detects the tilt of the seat back to the rearward tilt position when pressed, and a forward tilt position detection that detects the tilt of the seat back to the forward tilt position when pressed. And the rotating body is configured to be able to press the use position detection switch, the rear position detection switch, and the forward tilt position detection switch.

  In the vehicle seat according to the third aspect, the use position detection switch is provided in the drive mechanism, and it is detected that the seat back is tilted to the use position when the rotating body presses the use position detection switch. The Further, the drive mechanism is provided with a rearward tilt position detection switch, and when the rotating body presses the rearward tilt position detection switch, it is detected that the seat back is tilted to the rearward tilt position. Further, the drive mechanism is provided with a forward tilt position detection switch, and when the rotating body presses the forward tilt position detection switch, it is detected that the seat back is tilted to the forward tilt position.

  Thereby, since the position where the seat back is tilted can be detected by rotating the rotating body, the position of the seat back tilted with a simple configuration is detected. Further, since the rotating body directly presses the use position detection switch, the rear position detection switch, and the forward tilt position detection switch, the detection accuracy of the tilted seat back position can be improved.

  The vehicle seat according to claim 4 is the vehicle seat according to any one of claims 1 to 3, wherein the release mechanism releases the lock of the lock mechanism when operated. A release lever and an actuator connected to the release lever and actuating the release lever by being driven.

  In the vehicle seat according to the fourth aspect, the release mechanism includes a release lever and an actuator. The actuator is connected to a release lever, and when the actuator is driven, the release lever is operated and the lock mechanism is unlocked. Thus, for example, by connecting the actuator to a lever that releases the lock of the lock mechanism provided in the conventional reclining device, the lock of the lock mechanism can be released while using the conventional reclining mechanism. Furthermore, since the lever can be operated by driving the actuator, convenience is improved.

  According to the vehicle seat of the first aspect, the seat back can be tilted by driving the motor between the front-falling position and the rear-falling position, and the reclining strength can be sufficiently secured.

  According to the vehicle seat of the second aspect, for example, the seat back can be tilted by driving the motor between the forward tilt position and the rear tilt position while using a reclining device that tilts the conventional seat back.

  According to the vehicle seat of the third aspect, the position where the seat back is tilted can be detected with a simple configuration, and the detection accuracy of the position of the tilted seat back can be improved.

  According to the vehicle seat of the fourth aspect, the conventional reclining mechanism can be used, and the convenience when unlocking the lock mechanism can be improved.

It is the disassembled perspective view which shows the principal part of the rear seat which concerns on embodiment of this invention. FIG. 2 is a side view of the seat back held by the seat back frame shown in FIG. 1 as viewed from the outside in the seat width direction showing a state where the seat back is disposed at a use position. (A) shows the state in which the lock release lever is disposed at the lock position and the sector gear is disposed at the initial position when the seat back illustrated in FIG. 2 is disposed at the use position. It is the side view seen, (B) is the side view which looked at the state of (A) from the sheet width direction inner side. FIG. 2A is a seat width direction outer side showing a state where the lock release lever is arranged at the lock release position and the sector gear is arranged at the initial position when the seat back shown in FIG. 2 is arranged at the use position. (B) is a side view of the state of (A) viewed from the inside in the sheet width direction. FIG. 2A is a seat showing a state in which the lock release lever is arranged at the unlock position and the sector gear is arranged at the rear tilt completion position in the state where the seat back shown in FIG. 2 is arranged at the rear tilt position. It is the side view seen from the width direction outer side, (B) is the side view which looked at the state of (A) from the sheet width direction inner side. (A) is a seat width indicating a state in which the lock release lever is disposed at the lock position and the sector gear is disposed at the rearward tilt completion position when the seat back illustrated in FIG. 2 is disposed at the rearward tilt position. It is the side view seen from the direction outer side, (B) is the side view which looked at the state of (A) from the sheet width direction inner side. (A) is a seat showing a state where the lock release lever is arranged at the lock release position and the sector gear is arranged at the front tilt completion position in the state where the seat back shown in FIG. It is the side view seen from the width direction outer side, (B) is the side view which looked at the state of (A) from the sheet width direction inner side. (A) is a seat width indicating a state in which the lock release lever is disposed at the lock position and the sector gear is disposed at the forward tilt completion position when the seat back illustrated in FIG. 2 is disposed at the forward tilt position. It is the side view seen from the direction outer side, (B) is the side view which looked at the state of (A) from the sheet width direction inner side.

  FIG. 1 is an exploded perspective view of a main part of a rear seat 10 as a vehicle seat according to an embodiment of the present invention. Note that an arrow FR appropriately shown in the drawing indicates the front direction of the rear seat 10, and an arrow W indicates the width direction of the rear seat 10. An arrow UP indicates an upward direction.

  As shown in this figure, the rear seat 10 includes a pair of seat cushion side brackets 12 and 14. The seat cushion side brackets 12 and 14 are fastened and fixed to the floor of the vehicle body. A long connecting member 16 is provided at the upper end of the seat cushion side brackets 12 and 14 at the rear of the seat. The connecting member 16 is disposed along the seat width direction and connected to the seat cushion side brackets 12 and 14. A base plate 20 is provided behind the seat cushion side bracket 14 and is fastened and fixed to the floor of the vehicle body.

  As shown in FIG. 2, a seat cushion 22 is attached above the seat cushion side brackets 12 and 14. Further, a seat back 24 is provided in a standing state behind the seat cushion 22, and the seat back 24 is rotatably connected to a floor portion of the vehicle body.

  As shown in FIG. 1, the seat back 24 is provided with a seat back frame 26 that constitutes a skeleton of the seat back 24. The seat back frame 26 has a frame main body 28 formed of a pipe material, and the frame main body 28 is formed in a substantially rectangular frame shape when viewed from the front. The seat back frame 26 has a pair of side portions 30 and 32 formed of a sheet metal material, and the side portions 30 and 32 are fixed to both side portions on the lower end side of the frame main body 28.

  As shown in FIG. 2, a seat back side bracket 34 as a rotating member constituting a part of the seat back frame 26 is provided below the side portion 32 of the seat back frame 26. The seat back side bracket 34 is formed in a substantially plate shape, and is fixed to the outer side surface in the seat width direction on the lower end side of the side portion 32. The seat back side bracket 34 is rotatably connected to the upper end portion of the base plate 20 described above via a support shaft 36 disposed along the seat width direction. Thus, the portion of the seat back frame 26 on one side in the seat width direction is rotatably connected to the vehicle body floor portion via the support shaft 36 and the base plate 20. Further, the seat back side bracket 34 is provided with a cylindrical protruding pin 34A. The protruding pin 34A protrudes inward in the seat width direction from the seat back side bracket 34 and engages with an engaging groove 90 of a sector gear 88 described later.

  A reclining mechanism 40 is provided between the side portion 30 of the seat back frame 26 and the seat cushion side bracket 12. The reclining mechanism 40 is connected to the lower end portion of the side portion 30 and the rear end portion of the seat cushion side bracket 12. As a result, the portion of the seat back frame 26 on the other side in the seat width direction is connected to the seat cushion side bracket 12 via the reclining mechanism 40. The reclining mechanism 40 is a general one that has been conventionally used, and includes a recliner 42.

  The recliner 42 (recliner mechanism 40) is for adjusting the tilt angle (recliner angle) of the seat back 24 with respect to the seat cushion 22 and tilting (turning), and is arranged coaxially with the support shaft 36. Has been. Thereby, the seat back 24 is located between the use position shown in FIG. 2 with respect to the seat cushion 22 and the forward tilt position (not shown) set in front of the seat from the use position, and the use position and the use position. Further, it is configured to be tiltable between a rearwardly tilted position (not shown) set at the rear of the seat. Further, the reclining angle of the seat back 24 is configured to be adjustable in multiple stages between the use position and the rearward tilt position by the recliner 42 and a lock mechanism 44 described later.

  Here, the use position refers to a position where the seat back 24 is substantially upright with respect to the seat cushion 22 and a position where the reclining angle of the seat back 24 is set to the first stage. The forward tilt position is a position where the seat back 24 overlaps the upper side of the seat cushion 22 substantially in parallel. At the forward tilt position, the back of the seat back 24 is used as a table, Can be used as part. Further, the rearward tilt position is a position where the seat back 24 is reclined rearward with respect to the seat cushion 22 and the reclining angle of the seat back 24 is set at the final stage. Can be taken.

  The recliner 42 is provided with a known lock mechanism 44. When the seat back 24 is tilted between the use position and the rearward tilt position, the lock mechanism 44 is configured to lock (restrain) the seat back 24 so as not to tilt. Thereby, the seat back 24 is held at the reclining position between the use position and the rearward tilt position. On the other hand, in the state where the seat back 24 is disposed at the forward tilt position, it is not necessary to lock (restrain) the seat back 24 so that it cannot be tilted. In this state, the lock mechanism 44 does not lock the seat back 24. It is configured.

  On the other hand, a release mechanism 46 constituting a lock mechanism 44 is provided on the outer side of the base plate 20 in the sheet width direction, and the release mechanism 46 includes a lock release lever 48 as a release lever. The lock release lever 48 is disposed on the outer side in the seat width direction with respect to the base plate 20 and is rotatably supported by the base plate 20. Further, the lock release lever 48 is connected to the lock mechanism 44 via the shaft 50 and the connecting shaft 52 penetrating the shaft center portion of the support shaft 36 described above.

  When the seat release 24 is tilted to the reclining position, the lock release lever 48 is disposed at the position shown in FIG. 3A (hereinafter, this position is referred to as “lock position”). 44 is configured to be in a locked state. However, as described above, the lock mechanism 44 is not locked with respect to the seat back 24 in the state in which the seat back 24 is disposed in the forwardly tilted position. Therefore, in this state, the lock release lever 48 is disposed in the lock position. In addition, the seat back 24 is configured to be tiltable. On the other hand, in a state where the seat back 24 is tilted to the reclining position, the lock release lever 48 rotates from the lock position in the direction of arrow A shown in FIG. 3A (hereinafter, this direction is referred to as “lock release direction”). Thus, the lock mechanism 44 is configured to be unlocked when placed at a position indicated by a solid line in FIG. 4A (hereinafter, this position is referred to as a “lock release position”). As a result, the lock mechanism 44 is unlocked, and the seat back 24 can be tilted. In FIG. 2, only a part of the lock release lever 48 is shown for convenience of explanation.

  An urging spring 54 is stretched between the lock release lever 48 and the base plate 20. The urging spring 54 always urges the lock mechanism 44 in a direction opposite to the unlocking direction (in the direction of arrow B shown in FIG. 3A, this direction is referred to as “lock direction”). .

  An actuator 56 constituting the release mechanism 46 is connected to the lock release lever 48 via a wire or the like. When the actuator 56 is actuated (driven), the actuator 56 rotates the unlock lever 48 against the biasing force of the bias spring 54 in the unlock direction, and the unlock lever 48 is arranged at the unlock position. . On the other hand, when the operation of the actuator 56 is stopped, the lock release lever 48 is rotated in the locking direction by the urging force of the urging spring 54 and is arranged at the lock position.

  The unlocking lever 48 is formed with an arm portion 48A at the rear end portion, and the arm portion 48A corresponds to a first limit switch 58 described later. A first limit switch 58 (an element grasped as a “lock position detection switch” in a broad sense) is provided behind the seat of the arm portion 48A. The first limit switch 58 is attached to the mounting bracket 60, and the mounting bracket 60 is fixed to the base plate 20. The first limit switch 58 is pressed by the arm portion 48A when the lock release lever 48 is disposed at the lock position. As a result, the first limit switch 58 is turned on.

  A drive mechanism 62 is provided inside the base plate 20 in the sheet width direction. The drive mechanism 62 is a device for tilting the seat back 24 between the use position and the forward tilt position and between the use position and the rear tilt position. The drive mechanism 62 includes a holding bracket 64. The holding bracket 64 is disposed on the inner side in the seat width direction with respect to the base plate 20 and is attached to the base plate 20.

  As shown in FIGS. 3 to 8, a second limit switch 66 as a use position detection switch is attached to the upper end portion of the holding bracket 64. In addition, a third limit switch 68 is attached to the holding bracket 64 as a backward tilt position detection switch at a position behind the seat of the second limit switch 66. Further, a fourth limit switch 70 as a forward tilt position detection switch is attached to the holding bracket 64 at a position behind the seat of the third limit switch 68. The second limit switch 66 and the third limit switch 68 correspond to a first pressing portion 92 of a sector gear 88 described later, and the fourth limit switch 70 corresponds to a second pressing portion 94 of a sector gear 88 described later. . 3 to 8, the second limit switch 66, the third limit switch 68, and the fourth limit switch 70 are shown in a simplified shape, and the holding bracket 64 is not shown.

  A motor unit 72 is disposed inside the holding bracket 64 in the seat width direction. The motor unit 72 includes a motor 74 and a gear box 76, and the gear box 76 is fixed to the holding bracket 64 with bolts. The output shaft 78 of the motor unit 72 protrudes outward in the seat width direction from the gear box 76 and passes through the holding bracket 64. A substantially cylindrical motor gear 80 is fixed to the tip of the output shaft 78. The motor gear 80 is disposed between the holding bracket 64 and the base plate 20, and external teeth are formed on the entire outer periphery of the motor gear 80.

  A gear train 81 as a transmission portion is provided between the holding bracket 64 and the base plate 20. The gear train 81 includes a substantially disc-shaped transmission gear 82, and external teeth are formed on the outer periphery of the transmission gear 82. The transmission gear 82 is rotatably supported by the holding bracket 64 and the base plate 20, and the external teeth of the transmission gear 82 are meshed with the external teeth of the motor gear 80. Further, a substantially disc-shaped reduction gear 84 constituting the gear train 81 is provided on the side of the transmission gear 82, and external teeth are formed on the entire outer periphery of the reduction gear 84. The reduction gear 84 is rotatably supported by the holding bracket 64 and the base plate 20, and the external teeth of the reduction gear 84 are engaged with the external teeth of the transmission gear 82. Further, the reduction gear 84 is provided with a substantially disk-shaped small-diameter gear 86 constituting the gear train 81 coaxially and integrally on the inner side in the seat width direction. External teeth are formed on the entire outer periphery of the small-diameter gear 86 (the small-diameter gear 86 is not shown in FIGS. 1 and 2).

  Between the holding bracket 64 and the seat back side bracket 34, a substantially sector-shaped sector gear 88 constituting a gear train 81 as a rotating body is provided. The sector gear 88 is rotatably supported on the support shaft 36 described above. External teeth are formed on the outer peripheral portion of the sector gear 88, and the external teeth mesh with the external teeth of the small diameter gear 86. As described above, since the support shaft 36 is disposed coaxially with the recliner 42, the sector gear 88 is disposed coaxially with the tilt center (rotation center) of the seat back 24 with respect to the seat cushion 22. . The arrangement of the seat back side bracket 34 and the base plate 20 in the seat width direction with respect to the sector gear 88, the motor gear 80, the transmission gear 82, and the reduction gear 84 is as shown in FIG. 1, but in FIG. A sector gear 88, a motor gear 80, a transmission gear 82, and a reduction gear 84 are shown on the front side of the back side bracket 34 and the base plate 20.

  An engaging groove 90 is provided in the upper portion of the outer periphery of the sector gear 88. The engaging groove 90 is arranged along the radial direction of the sector gear 88 and is opened toward the radially outer side of the sector gear 88. The groove width dimension of the engagement groove 90 is set to be slightly larger than the outer diameter dimension of the protrusion pin 34A of the seat back side bracket 34, and the protrusion pin 34A is disposed in the engagement groove 90 to protrude. The pin 34A and the engagement groove 90 are engaged. Thereby, the motor 74 of the motor unit 72 is connected to the seat back side bracket 34 via the motor gear 80 and the gear train 81 (the transmission gear 82, the reduction gear 84, the small diameter gear 86, and the sector gear 88). Further, the rotational force of the motor unit 72 (motor 74) is transmitted to the sector gear 88 through the motor gear 80, the transmission gear 82, the reduction gear 84, and the small diameter gear 86, whereby the sector gear 88 is tilted backward (see FIG. ) And (B) in the direction of arrow C) or forward tilt direction (in the direction of arrow D shown in FIGS. 5A and 5B). Further, at this time, the inner peripheral surface of the engagement groove 90 abuts on the outer peripheral surface of the projecting pin 34A, and the seat back side bracket 34 (seat back 24) tilts backward (see FIGS. 5A and 5B). ) Shown in FIG. 5A) or in a forward tilt direction (arrow F direction shown in FIGS. 5A and 5B).

  A first pressing portion 92 (see FIG. 3B) is provided on the outer peripheral portion of the sector gear 88 at a position behind the seat of the engagement groove 90. In a state where the sector gear 88 is disposed at the position shown in FIG. 3B (hereinafter, this position is referred to as “initial position”), the seat back 24 is disposed at the use position, and the first pressing portion 92 is The 2 limit switch 66 is set to be pressed. Thereby, in this state, the second limit switch 66 is turned on. Further, when the sector gear 88 is rotated in the backward tilting direction from this state and the sector gear 88 is disposed at the position shown in FIG. 5B (hereinafter, this position is referred to as “backward tilt completion position”), The seat back 24 is tilted to the rearward tilt position, and the first pressing portion 92 is set to press the third limit switch 68. Thereby, in this state, the second limit switch 66 and the third limit switch 68 are turned on.

  Further, a second pressing portion 94 is provided on the outer peripheral portion of the sector gear 88 at a position adjacent to the outer teeth of the sector gear 88 (see FIG. 3B). When the sector gear 88 is rotated in the forward tilt direction from the initial position and disposed at the position shown in FIG. 7B (hereinafter, this position is referred to as “the forward tilt completion position”), the seat back 24 is The second pressing portion 94 is set to press the fourth limit switch 70 while being tilted to the forward tilt position. Thereby, in this state, the fourth limit switch 70 is turned on.

  The driving mechanism 62 includes a control circuit (not shown). The first limit switch 58 to the fourth limit switch 70 are electrically connected to the control circuit, and the motor 74 and the actuator 56 of the motor unit 72 are electrically connected. In addition, an operation switch (not shown) is electrically connected to the control circuit, and the operation switch is disposed, for example, in the vicinity of the driver's seat of the vehicle. Further, the control circuit is configured to control the operation (drive) of the motor 74 and the actuator 56 based on the operation state of the operation switch and the ON / OFF states of the first limit switch 58 to the fourth limit switch 70. Yes.

  Next, the operation and effect of the present embodiment will be described.

  First, the operation of tilting the seat back 24 from the use position in the backward tilt direction will be described.

  As shown in FIGS. 3A and 3B, when the seat back 24 is in the use position, the lock release lever 48 is in the lock position, and the lock mechanism 44 is in the lock state. . For this reason, the seat back 24 is locked so as not to tilt. In this state, since the arm portion 48A of the lock release lever 48 presses the first limit switch 58, the first limit switch 58 is turned on. The sector gear 88 is disposed at the initial position, and the first pressing portion 92 of the sector gear 88 presses the second limit switch 66, and the second limit switch 66 is turned on.

  In this state, when the occupant operates the operation switch to rotate the seat back 24 in the backward tilt direction, the actuator 56 is actuated (driven) by the control circuit. As a result, the actuator 56 rotates the lock release lever 48 from the lock position to the lock release position against the urging force of the urging spring 54, so that the lock mechanism 44 enters the unlocked state (see FIG. 4A). ). At this time, the arm portion 48A of the lock release lever 48 is separated from the first limit switch 58, and the first limit switch 58 is turned off.

  When the control circuit recognizes that the first limit switch 58 is in the OFF state, the control circuit drives the motor 74 of the motor unit 72 so as to rotate the sector gear 88 in the backward tilt direction. When the motor 74 is driven, the rotational force of the motor unit 72 is transmitted to the sector gear 88 via the motor gear 80, the transmission gear 82, the reduction gear 84, and the small diameter gear 86, so that the sector gear 88 is rotated backward. The At this time, the inner peripheral surface of the engaging groove 90 of the sector gear 88 abuts on the outer peripheral surface of the protruding pin 34A of the seat back side bracket 34, and the seat back side bracket 34 is rotated, so that the seat back 24 is Tilt in the backward direction. When the operation of the occupant's operation switch is stopped in this state, the control circuit stops the driving of the motor 74, and the rotation of the sector gear 88 in the backward tilt direction is stopped. Accordingly, in response to the rotation of the sector gear 88, the seat back 24 is tilted to the reclining position between the use position and the rearward tilt position.

  Note that when the operation switch is continuously operated so that the sector gear 88 is rotated to the rearward completion position, the first pressing portion 92 of the sector gear 88 presses the third limit switch 68. For this reason, the control circuit stops the driving of the motor 74 when the third limit switch 68 is turned on. Accordingly, the seat back 24 is tilted to the rearward tilt position (see FIG. 5B).

  After the drive of the motor 74 is stopped, the control circuit stops the operation of the actuator 56. Thereby, the unlocking lever 48 is rotated from the unlocked position to the locked position by the biasing force of the biasing spring 54 (see FIG. 6A). At this time, the arm portion 48A of the lock release lever 48 presses the first limit switch 58, the first limit switch 58 is turned on, and the lock mechanism 44 is locked. Therefore, the seat back 24 is locked so as not to be tilted at the reclining position or the rearward tilt position.

  Next, the operation of tilting the seat back 24 from the rearward tilt position in the forward tilt direction will be described.

  As shown in FIGS. 6A and 6B, in the state where the seat back 24 is disposed in the rearward tilt position, the lock release lever 48 is disposed in the lock position, and the lock mechanism 44 is in the locked state. Yes. For this reason, the seat back 24 is locked so as not to tilt. In this state, since the arm portion 48A of the lock release lever 48 presses the first limit switch 58, the first limit switch 58 is turned on. In addition, the sector gear 88 is disposed at the position where the rearward tilting is completed, and the first pressing portion 92 of the sector gear 88 presses the second limit switch 66 and the third limit switch 68, and the second limit switch 66 and the third limit switch. 68 is turned on.

  In this state, when the occupant operates the operation switch to rotate the seat back 24 in the forward tilt direction, the actuator 56 is activated by the control circuit. As a result, the actuator 56 rotates the lock release lever 48 from the lock position to the lock release position against the urging force of the urging spring 54, and the lock mechanism 44 enters the unlocked state (see FIG. 5A). . At this time, the arm portion 48A of the lock release lever 48 is separated from the first limit switch 58, and the first limit switch 58 is turned off.

  When the control circuit recognizes that the first limit switch 58 is in the OFF state, the control circuit drives the motor 74 of the motor unit 72 so as to rotate the sector gear 88 in the forward tilt direction. When the motor 74 is driven, the rotational force of the motor unit 72 is transmitted to the sector gear 88 via the motor gear 80, the transmission gear 82, the reduction gear 84, and the small diameter gear 86, whereby the sector gear 88 is rotated in the forward tilt direction. The At this time, the inner peripheral surface of the engaging groove 90 of the sector gear 88 abuts on the outer peripheral surface of the protruding pin 34A of the seat back side bracket 34, and the seat back side bracket 34 is rotated, so that the seat back 24 is Tilt in the forward direction. When the operation of the occupant's operation switch is stopped in this state, the control circuit stops the driving of the motor 74, and the sector gear 88 stops rotating in the forward tilt direction. Accordingly, in response to the rotation of the sector gear 88, the seat back 24 is tilted to the reclining position between the rearward tilt position and the use position.

  When the operation switch is continuously operated so that the sector gear 88 is rotated until it exceeds the initial position, the first pressing portion 92 of the sector gear 88 is separated from the second limit switch 66. Thus, when the second limit switch 66 is turned off, the control circuit stops driving the motor 74 and drives the motor 74 so as to rotate the sector gear 88 in the backward tilt direction. Then, the sector gear 88 is rotated toward the initial position, and the first pressing portion 92 of the sector gear 88 presses the second limit switch 66. For this reason, the control circuit stops the driving of the motor 74 when the second limit switch 66 changes from the OFF state to the ON state. As a result, the seat back 24 is tilted to the use position (see FIGS. 4A and 4B).

  After the drive of the motor 74 is stopped, the control circuit stops the operation of the actuator 56. Thereby, the unlocking lever 48 is rotated from the unlocked position to the locked position by the biasing force of the biasing spring 54 (see FIG. 3A). At this time, the arm portion 48A of the lock release lever 48 presses the first limit switch 58, the first limit switch 58 is turned ON, and the lock mechanism 44 is locked. Therefore, the seat back 24 is locked so as not to be tilted at the reclining position or the use position between the rearward tilt position and the use position.

  Next, the operation of tilting the seat back 24 from the use position in the forward tilt direction will be described.

  As described above, as shown in FIGS. 3A and 3B, in a state where the seat back 24 is disposed at the use position, the lock release lever 48 is disposed at the lock position, and the lock mechanism 44 is locked. It is in a state. For this reason, the seat back 24 is locked so as not to tilt. In this state, since the arm portion 48A of the lock release lever 48 presses the first limit switch 58, the first limit switch 58 is turned on. The sector gear 88 is disposed at the initial position, and the first pressing portion 92 of the sector gear 88 presses the second limit switch 66, and the second limit switch 66 is turned on.

  In this state, when the occupant operates the operation switch to rotate the seat back 24 in the forward tilt direction, the actuator 56 is activated by the control circuit. As a result, the actuator 56 rotates the lock release lever 48 from the lock position to the lock release position against the urging force of the urging spring 54, and the lock mechanism 44 enters the unlocked state (see FIG. 4A). . At this time, the arm portion 48A of the lock release lever 48 is separated from the first limit switch 58, and the first limit switch 58 is turned off.

  When the control circuit recognizes that the first limit switch 58 is in the OFF state, the control circuit drives the motor 74 of the motor unit 72 so as to rotate the sector gear 88 in the forward tilt direction. Thereby, the sector gear 88 is rotated from the initial position to the forward tilt completion position, and the seat back side bracket 34 and the seat back 24 are tilted from the use position to the forward tilt position (see FIG. 7B). When the seat back 24 is tilted to the forward tilt position, the second pressing portion 94 of the sector gear 88 presses the fourth limit switch 70 and the fourth limit switch 70 is turned on, so that the control circuit The drive of the motor 74 is stopped.

  After the drive of the motor 74 is stopped, the control circuit stops the operation of the actuator 56. Thereby, the unlocking lever 48 is rotated from the unlocked position to the locked position by the biasing force of the biasing spring 54 (see FIG. 8A). When the lock release lever 48 is rotated to the lock position, the arm portion 48A of the lock release lever 48 presses the first limit switch 58, and the first limit switch 58 is turned on. In this state, the lock release lever 48 is disposed at the lock position, but the lock mechanism 44 is not locked to the seat back 24 (the seat) because the seat back 24 is tilted to the forward tilt position. The back 24 can be tilted).

  Next, the operation of tilting the seat back 24 from the forward tilt position to the use position will be described.

  As shown in FIGS. 8A and 8B, in a state where the seat back 24 is disposed at the forward tilt position, the lock release lever 48 is disposed at the lock position, and the arm portion 48A of the lock release lever 48 is The first limit switch 58 is pressed, and the first limit switch 58 is turned on. However, as described above, in this state, the lock release lever 48 is disposed at the lock position. However, since the seat back 24 is tilted to the forward tilt position, the lock mechanism 44 is locked with respect to the seat back 24. (The seat back 24 is tiltable). Further, the sector gear 88 is disposed at the forward tilt completion position, the second pressing portion 94 of the sector gear 88 presses the fourth limit switch 70, and the fourth limit switch 70 is turned on.

  In this state, when the occupant operates the operation switch to rotate the seat back 24 in the backward tilt direction, the actuator 56 is actuated by the control circuit. As a result, the actuator 56 rotates the lock release lever 48 from the lock position to the lock release position against the biasing force of the biasing spring 54 (see FIG. 7A). At this time, the arm portion 48A of the lock release lever 48 is separated from the first limit switch 58, and the first limit switch 58 is turned off.

  When the control circuit recognizes that the first limit switch 58 is in the OFF state, the control circuit drives the motor 74 of the motor unit 72 so as to rotate the sector gear 88 in the backward tilt direction. Thereby, the sector gear 88 is rotated from the forward tilt completion position to the initial position, and the seat back side bracket 34 and the seat back 24 are tilted (returned) from the forward tilt position to the use position (see FIG. 4B). ). When the seat back 24 is tilted to the use position, the first pressing portion 92 of the sector gear 88 presses the second limit switch 66, and the second limit switch 66 is turned on, so that the control circuit becomes a motor. The drive of 74 is stopped.

  After the drive of the motor 74 is stopped, the control circuit stops the operation of the actuator 56. Thereby, the unlocking lever 48 is rotated from the unlocked position to the locked position by the biasing force of the biasing spring 54 (see FIG. 3A). At this time, the arm portion 48A of the lock release lever 48 presses the first limit switch 58, the first limit switch 58 is turned on, and the lock mechanism 44 is locked. Therefore, the seat back 24 is locked so as not to tilt at the use position.

  Here, when the motor 74 of the drive mechanism 62 is driven when the lock mechanism 44 is unlocked, the rotational force of the motor unit 72 is transmitted via the motor gear 80, the transmission gear 82, the reduction gear 84, and the small-diameter gear 86. Is transmitted to the sector gear 88. As a result, the sector gear 88 is rotated in the forward or backward direction. At this time, the inner peripheral surface of the engaging groove 90 of the sector gear 88 abuts on the outer peripheral surface of the protruding pin 34A of the seat back side bracket 34, and the seat back side bracket 34 is rotated, so that the seat back 24 is Tilt in the forward or backward direction. As a result, the seat back 24 is tilted (turned) by driving the motor 74 between the use position and the forward tilt position and between the use position and the rear tilt position. Further, after the seat back 24 is tilted between the use position and the rearward tilt position, the seat back 24 is locked by the lock mechanism 44 so as not to tilt. For this reason, the seat back 24 is held by the lock mechanism 44. Thereby, the reclining strength of the seat back 24 can be sufficiently secured. Therefore, the seat back 24 can be tilted between the forward tilt position and the rear tilt position by driving the motor 74, and the reclining strength for holding the seat back 24 can be sufficiently secured.

  The seatback side bracket 34 is provided with a protruding pin 34A. In addition, a sector gear 88 is rotatably provided in the drive mechanism 62, and the gear train 81 is connected to the seat back side bracket 34 by engaging the engaging groove 90 of the sector gear 88 with the protruding pin 34A. The Thus, by providing the engagement groove 90 that engages with the protruding pin 34A in the sector gear 88 of the drive mechanism 62, for example, the seatback 24 is moved forwardly by driving the motor 74 while using the conventional reclining mechanism 40. And can be tilted back and forth.

  Further, a second limit switch 66, a third limit switch 68, and a fourth limit switch 70 are attached to the holding bracket 64. The second limit switch 66 and the third limit switch 68 are configured to be pressed against the first pressing portion 92 of the sector gear 88, and the fourth limit switch 70 is configured to be pressed against the second pressing portion 94 of the sector gear 88. ing. Accordingly, since the position where the seat back 24 is tilted by the rotation of the sector gear 88 can be detected, the position of the tilted seat back can be detected with a simple configuration. Moreover, since the sector gear 88 directly presses the second limit switch 66, the third limit switch 68, and the fourth limit switch 70, the detection accuracy of the position of the tilted seat back 24 can be improved.

  In addition, an actuator 56 is connected to the lock release lever 48. When the actuator 56 operates (drives), the lock release lever 48 is rotated from the lock position to the lock release position, and the lock mechanism 44 is unlocked. The Thus, by connecting the actuator 56 to the lock release lever 48 provided in the conventional reclining mechanism 40, the lock of the lock mechanism 44 can be released while using the conventional reclining mechanism 40. Furthermore, since the lock release lever 48 can be operated by the operation of the actuator 56, the convenience can be improved.

  In the present embodiment, the seat back side bracket 34 and the sector gear 88 are configured separately, and the protruding pin 34A of the seat back side bracket 34 and the engagement groove 90 of the sector gear 88 are engaged. . Instead of this, the seat back side bracket 34 and the sector gear 88 may be integrally formed.

  Further, in the present embodiment, when the seat back 24 is tilted from the rearward tilt position to the use position, the seat back 24 is once tilted from the use position to the front tilt direction without being stopped at the use position, and then the seat back. 24 is placed in the use position. Instead, when the seat back 24 is tilted from the rearward tilt position to the use position, the driving of the motor 74 may be stopped when the seat back 24 returns to the use position. In this case, a limit switch is additionally provided in the holding bracket 64 so that when the sector gear 88 is disposed at the initial position, the second pressing portion 94 of the sector gear 88 presses the added limit switch. That's fine. With this configuration, when the sector gear 88 rotates in the forward tilt direction from the rearward tilt completion position, the added limit switch is not pressed by the second pressing portion 94 until the sector gear 88 reaches the initial position. Become. On the other hand, when the sector gear 88 reaches the initial position, the added limit switch is pressed by the second pressing portion 94 and is turned on. Thereby, since the control circuit can detect the return of the seat back 24 to the use position, the drive of the motor 74 can be stopped when the seat back 24 is returned to the use position.

  Further, in the present embodiment, when the seat back 24 is tilted from the use position to the forward tilt position, the seat back 24 is tilted forward without stopping between the use position and the forward tilt position. Tilt to position. Further, when the seat back 24 is tilted from the forward tilt position to the use position, the seat back 24 is tilted (returned) to the use position without stopping between the forward tilt position and the use position. The Alternatively, when the seat back 24 is tilted from the use position to the forward tilt position, the seat back 24 may be configured to be stopped between the use position and the forward tilt position. The seat back 24 may be configured to be able to stop between the forward-turned position and the use position when the vehicle is tilted from the forward-fall position to the use position. In this case, the control circuit may be configured to stop the driving of the motor 74 when the operation of the operation switch is stopped.

  In the present embodiment, the lock release lever 48 is connected to the actuator 56. When the actuator 56 is actuated (driven), the lock release lever 48 is rotated in the lock release direction to the lock release position. Be placed. On the other hand, when the operation of the actuator 56 is stopped, the lock release lever 48 is rotated in the locking direction by the urging force of the urging spring 54 and is arranged at the lock position. Instead of this, the biasing spring 54 may be deleted, and for example, a holding type solenoid may be applied to the actuator 56 to hold the position of the lock release lever 48 at the operating position of the actuator 56.

  Thus, when the seat back 24 is tilted (turned) from the use position to the forward tilt position, the operation of the actuator 56 is stopped, whereby the lock release lever 48 is held at the lock release position. On the other hand, when the seatback 24 is tilted (rotated) from the forward-turned position to the use position, the lock release lever 48 is held at the unlocked position in the forward-turned position, so that the passenger operates the operation switch. Thus, the motor 74 of the motor unit 72 can be driven immediately so that the sector gear 88 is rotated backward. Furthermore, after the seat back 24 is tilted (turned) to the use position, the lock release lever 48 can be rotated to the lock position by operating the actuator 56.

  Furthermore, in the present embodiment, the case where the invention according to claims 1 to 4 is applied to the rear seat 10 of the vehicle has been described, but the invention according to claims 1 to 4 is applied to the front seat of the vehicle. May be.

10 Rear seat (vehicle seat)
22 Seat cushion 24 Seat back 34 Seat back side bracket (rotating member)
34A Protruding pin 44 Lock mechanism 46 Release mechanism 48 Lock release lever (release lever)
56 Actuator 62 Drive mechanism 66 Second limit switch (use position detection switch)
68 3rd limit switch (backward tilt position detection switch)
70 Fourth limit switch (forward tilt position detection switch)
74 Motor 81 Gear train (Transmission unit)
88 Sector gear (Rotating body)
90 engaging groove

Claims (4)

A seat cushion connected to the vehicle body,
A seat back configured to be tiltable between a use position and a front-falling position and between the use position and a rear-falling position with respect to the seat cushion;
A lock mechanism having a release mechanism for locking the seat back so as not to tilt between the use position and the rearward tilt position and releasing the lock;
A rotating member that is rotatably supported by the vehicle body and connected to the seat back, and tilts the seat back by rotating;
A motor that generates a rotational force by being driven, and a transmission unit that is coupled to the motor and the rotating member and transmits the rotational force of the motor to the rotating member, and is configured to lock the lock mechanism by the release mechanism. When the motor is released, the rotating member is rotated by driving the motor to tilt the seat back between the use position and the front tilt position and between the use position and the rear tilt position. A drive mechanism;
Vehicle seat equipped with A protruding pin provided protruding from the rotating member;
The rotating member constitutes a part of the transmitting portion and has an engaging groove that is engaged with the protruding pin to connect the transmitting portion to the rotating member, and is rotated by driving the motor. A rotating body that rotates
The vehicle seat according to claim 1, comprising: The drive mechanism detects a tilt of the seat back to the use position by being pressed, and a back tilt to detect the tilt of the seat back to the back tilt position by being pressed. A position detection switch, and a forward tilt position detection switch that detects a tilt of the seat back to the forward tilt position when pressed,
The vehicle seat according to claim 2, wherein the rotating body is configured to be able to press the use position detection switch, the rear position detection switch, and the forward tilt position detection switch.   The said release mechanism is provided with the release lever which cancels | releases the said lock | rock of the said lock mechanism by being actuated, and the actuator which operates the said release lever by being connected to the said release lever, and driving. Item 4. The vehicle seat according to any one of Item 3.

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