JP2016210329A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which inhibits a load from becoming excessively large when an occupant moves a seat to a rear side while stretching its legs and applies the load to the legs.SOLUTION: A control part 29 releases a lock mechanism 23 to allow a slide bracket 15, to which a seat 1 is attached, to move relative to an inclined guide rail 5 during automatic operation of a vehicle. When an occupant M seated on the seat 1 stretches its legs with the legs placed on a footrest 31 during the automatic operation, the seat 1 slides obliquely upward to a rear side along the inclined guide rail 5. When the seat 1 is moved to the rear side, a rearward biasing force is applied to the seat by an extension coil spring 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle seat that moves in the front-rear direction.

  Conventionally, a vehicle seat described in Patent Document 1 is known. In the vehicle seat disclosed in Patent Document 1, the entire seat assembly is moved forward by pulling the seat assembly forward by a spring by releasing the lock.

Japanese Patent No. 3532855

  When the occupant sits on the seat for a long time and drives the vehicle, swelling of the legs may occur and fatigue may occur. At that time, if the seat is pulled forward by the spring, if the occupant pushes and moves the seat rearward to extend the leg in the unlocked state, the load is increased by the spring.

  Then, this invention aims at suppressing the load applied to a leg part, when a passenger | crew pushes and moves a sheet | seat back.

  In the present invention, the movement restriction in the front-rear direction of the seat is released during automatic driving of the vehicle, and the seat moves backward when the occupant seated on the seat extends the leg while pressing the foot against the vehicle body. A load applying mechanism that applies a load to the occupant's legs when the seat moves rearward, and a load reduction mechanism that reduces a load applied to the legs.

  According to the present invention, when the occupant moves the seat backward while extending the leg portion and applies a load to the leg portion, the load is reduced by the load reducing mechanism, so that it is possible to suppress the load from becoming too large.

It is a mimetic diagram showing the whole vehicle seat composition concerning one embodiment of the present invention. FIG. 2 is a schematic diagram showing a state in which the vehicle seat is moved obliquely upward to the rear with respect to FIG. 1.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall configuration diagram of a vehicle seat according to an embodiment of the present invention. The direction indicated by the arrow FR in the figure is the front of the vehicle. The vehicle on which the seat 1 is mounted is an automatic driving vehicle that automatically performs acceleration / deceleration and steering. FIG. 2 shows a state in which the seat 1 has moved backward with respect to FIG.

  On the floor 3 of the vehicle body, an inclined guide rail 5 serving as an inclined guide portion as a load applying mechanism for slidingly moving the seat 1 is provided. Two inclined guide rails 5 are provided corresponding to the vicinity of both sides of the seat 1 in the vehicle width direction. These two inclined guide rails 5 are supported by a front support member 7 on the front side of the vehicle, and supported by a rear support member 9 having a length in the vertical direction longer than that of the front support member 7.

  Accordingly, the two inclined guide rails 5 are inclined in the vehicle front-rear direction so that the vehicle rear side is higher than the vehicle front side. The seat 1 moves in the vehicle front-rear direction along the inclined guide rail 5 that is inclined.

  The seat 1 includes a seat cushion 11 and a seat back 13. The seat cushion 11 has slide brackets 15 attached to lower portions on both sides in the vehicle width direction, and the slide bracket 15 slides along the inclined guide rail 5.

  The slide bracket 15 is restricted from moving forward of the vehicle by a stopper 17 provided at the front portion of the inclined guide rail 5. Between the slide bracket 15 and the mounting portion 19 provided at the rear end of the inclined guide rail 5, a tension coil spring 21 serving as an elastic member as an urging force applying means is provided.

  The tension coil spring 21 applies a biasing force to the slide bracket 15 toward the rear of the vehicle that is separated from the stopper 17. The state in which the tension coil spring 21 applies the urging force toward the rear of the vehicle is ensured while the seat 1 is shifted from FIG. 1 to FIG.

  The lower part of the seat back 13 is connected to the rear part of the seat cushion 11. For this reason, the seat back 13 also moves integrally with the sliding movement of the seat cushion 11. The connecting portion between the seat back 13 and the seat cushion 11 is provided with a reclining mechanism (not shown) that allows the seat back 13 to change the tilt angle in the front-rear direction.

  Between the inclined guide rail 5 and the slide bracket 15, a lock mechanism 23 that restricts the movement of the seat 1 in the front-rear direction is provided. The lock mechanism 23 includes an engagement protrusion 25 provided substantially at the center in the length direction of the inclined guide rail 5 and an engagement recess 15a provided on the slide bracket 15 side.

  A drive unit 27 such as an electromagnetic actuator is mounted on the lower side of the inclined guide rail 5 opposite to the seat 1. By driving the drive unit 27, the engagement protrusion 25 moves forward and backward from the surface of the inclined guide rail 5 on the seat 1 side. In a state where the slide bracket 15 is in contact with the stopper 17 as shown in FIG. 1, the locking protrusion 23 protrudes and engages with the engaging recess 15a, so that the lock mechanism 23 is locked.

  The drive unit 27 is driven and controlled by the control unit 29. The control unit 29 determines whether or not the vehicle is in automatic operation, and when it is determined that the vehicle is in automatic operation, the control unit 29 moves the engaging protrusion 25 in the protruding state backward to unlock the lock mechanism 23. That is, when the control unit 29 determines that the vehicle is in an automatic operation and the automatic operation determination unit determines that the vehicle is in an automatic operation, the seat 1 by the lock mechanism 23 is determined. And a lock release portion for releasing the longitudinal movement restriction.

  The determination as to whether or not the vehicle is in automatic operation is made based on the traveling state of the vehicle used as vehicle information and information from various sensors. The various sensors include an automatic driving start switch (not shown) that is operated by an occupant to start automatic driving. After turning on the automatic driving start switch, it may be determined whether the vehicle is in automatic driving according to the traveling state such as the vehicle speed and the steering angle.

  A footrest 31 on the vehicle body side is provided on the floor 3 on the vehicle front side of the seat 1 or on the lower part of a dash panel (not shown). The dash panel is a partition member that separates the compartment 33 from an engine compartment that is located in front of the compartment 33 and accommodates an engine (not shown).

  The footrest 31 is disposed on the floor 3 in the vicinity of the side portion of the floor tunnel extending in the vehicle longitudinal direction at the center in the vehicle width direction and inside the vehicle body in front of the front door (not shown). That is, the footrest 31 is disposed on both the left and right sides with pedals such as an accelerator pedal and a brake pedal (not shown) that the occupant M steps on.

  In FIG. 1, a footrest 31 on the floor tunnel side, which is located on the back side of the page, places the left foot of the occupant M seated on the seat 1 of the right driver's seat. In FIG. 1, a footrest 31 on the front door side located on the front side of the paper surface places the right foot of the occupant M. Since the right foot of the occupant M needs to step on the accelerator pedal or the brake pedal, the case where the right foot is placed on the footrest 31 is when the vehicle is automatically driving.

  Next, the operation will be described. In the following description, a normal driving state in which the vehicle is not performing automatic driving is referred to as a normal driving mode, and a state in which automatic driving is being performed is referred to as an automatic driving mode.

  In the normal operation mode, the lock mechanism 23 is locked by the control portion 29 with the engagement protrusion 25 engaged with the engagement recess 15a, and the seat 1 is placed on the inclined guide rail 5 at the position shown in FIG. On the other hand, movement is restricted. In the normal operation mode, the occupant M operates by grasping the steering wheel 35 with his hand and depressing the accelerator pedal or the brake pedal with the right foot. The left foot is appropriately placed on the left footrest 31.

  When the occupant M shifts to the automatic operation mode by turning on the automatic operation switch in the normal operation mode, the control unit 29 determines that the vehicle is in automatic operation. The control unit 29 that determines that the vehicle is in automatic driving controls the driving unit 27 to retract the engaging protrusion 25 to release the lock. The driver M during the automatic driving basically does not need to operate the steering 35 or an accelerator pedal and a brake pedal (not shown), and therefore, the left and right feet can be put on the footrest 31.

  When the vehicle shifts to the automatic driving mode and the time of the automatic driving state becomes longer, for example, the occupant M may become tired due to swelling of the legs. Here, when the occupant M tries to extend the leg with the foot resting on the footrest 31 as shown in FIG. 1, a load pressing against the footrest 31 is applied, and the reaction force of the applied load is applied to the back and waist of the occupant M. Acting on the sheet 1 via That is, the seat 1 receives a load toward the rear of the vehicle by the occupant M.

  The seat 1 that has received a load toward the rear of the vehicle slides toward the rear and obliquely upward along the inclined guide rail 5 via the slide bracket 15 to be in the state of FIG. When the seat 1 moves rearward, the slide bracket 15 is pulled rearward by the rearward biasing force of the tension coil spring 21.

  For this reason, when the occupant M extends the leg and moves the seat 1 backward, the occupant M can reduce the load by the amount of the urging force applied backward by the tension coil spring 21. That is, the tension coil spring 21 constitutes a load reduction mechanism that reduces the load applied by the load application mechanism. Therefore, when the passenger | crew M extends a leg part, moves the seat | sheet 1 back, and applies a load to a leg part, it can suppress that the load becoming large too much. Such an effect is effective for a passenger with weak muscle strength.

  If the biasing force of the tension coil spring 21 corresponds to the weight of the seat 1 (including the weight of the slide bracket 15, the same applies hereinafter), the load can be reduced by the weight of the seat 1. In this case, the occupant M applies a load almost equal to his / her body weight on the legs in the initial stage of the operation of extending the legs. As the seat 1 moves rearward, the rearward biasing force of the tension coil spring 21 becomes smaller, so the load applied to the leg portion gradually increases.

  Here, the weight of the seat 1 is applied forward in the moving direction when the seat 1 arranged together with the slide bracket 15 on the inclined guide rail 5 slides by its own weight without using the tension coil spring 21. It is a load.

  Assume that the weight of the passenger M is 52.6 kg and the weight of the seat 1 is 15 kg. In this case, when the load is reduced by the weight of the seat 1 by the tension coil spring 21, a load reduction effect of about 22.2% is obtained with respect to the total weight of 67.6 kg. If it is not necessary to reduce the load by the weight of the seat 1 and only a part of the total weight is to be reduced, the urging force (tensile force) of the tension coil spring 21 may be reduced. Conversely, the biasing force of the tension coil spring 21 may slightly exceed the weight of the seat 1.

  The occupant M extends the leg portion as shown in FIG. 2 from the state of FIG. 1, so that each muscle of the leg portion is stretched and blood flow is improved by the muscle pump action, and the swelling of the leg portion of the ride for a long time can be improved. . Further, by extending the legs, the occupant M has a more uniform thigh contact state with respect to the seat cushion 11 as compared with the state of FIG. 1, so that pressure concentration on the buttocks is reduced.

  The load application mechanism of the present embodiment includes an inclined guide rail 5 on which the seat 1 moves so that the vehicle rear side is inclined to be higher than the vehicle front side. For this reason, it is possible to improve fatigue due to swelling of the legs of the occupant M during automatic operation with a simple structure in which the inclined guide rail 5 that is simply inclined with respect to the horizontal plane is provided as the load applying mechanism.

  When returning the seat 1 from the state shown in FIG. 2 to the state shown in FIG. 1, the occupant M releases the load applied to the footrest 31. Thus, the seat 1 easily moves the inclined guide rail 5 diagonally forward and downward against the urging force of the tension coil spring 21 to the rear by its own weight. The seat 1 that has moved forward on the inclined guide rail 5 is in a state of contacting the stopper 17 by its own weight. For this reason, even if the lock mechanism 23 is released in a state where the seat 1 is moved forward as shown in FIG. 2, the occupant M is prevented from moving backward in the state where the operation of extending the leg portion is not performed. it can.

  The load reducing mechanism of the present embodiment is an urging force applying unit that applies an urging force to the seat 1 toward the rear of the vehicle. For this reason, the occupant M can reduce the load when the leg portion is extended with a simple structure in which the urging force is simply applied to the seat 1 toward the rear of the vehicle.

  The biasing force applying means of this embodiment is an elastic member. For this reason, a driving mechanism such as an actuator is not required, and the urging force can be applied to the seat 1 backward with respect to the seat 1 at a simple and low cost.

  The elastic member of this embodiment is a tension coil spring 21. For this reason, it is possible to apply the urging force to the rear of the vehicle with respect to the seat 1 at a simpler and lower cost.

  The inclined guide rail 5 is different from a general seat slide rail that moves the vehicle seat back and forth depending on the physique and preference of the driver. Therefore, the inclined guide rail 5 may be attached to the seat slide rail via the front support member 7 and the rear support member 9. In this case, the inclined guide rail 5 moves back and forth on the seat slide rail.

  As mentioned above, although embodiment of this invention was described, these embodiment is only the illustration described in order to make an understanding of this invention easy, and this invention is not limited to the said embodiment. The technical scope of the present invention is not limited to the specific technical matters disclosed in the above embodiment, but includes various modifications, changes, alternative techniques, and the like that can be easily derived therefrom.

  For example, by using a constant load spring as the tension coil spring 21, a constant load reduction allowance can always be secured while the seat 1 shifts from the state of FIG. 1 to the state of FIG.

  In the above-described embodiment, the seat 1 is biased rearward by the tension coil spring 21, but an actuator such as an air cylinder may be used instead of the tension coil spring 21. By using the actuator, the cost for reducing the load can be adjusted according to the muscular strength of the occupant, and convenience is improved.

  Further, rubber may be used as the elastic member instead of the tension coil spring 21.

1 seat 5 inclined guide rail (inclined guide part, load applying mechanism)
21 Tensile coil spring (spring, elastic member, biasing force applying means, load reducing mechanism)
23 Lock mechanism 29 Control unit (automatic operation determination unit, lock release unit)
31 Footrest (body)

Claims (6)

A seat mounted on the vehicle and moving in the front-rear direction;
A lock mechanism for restricting the movement of the seat in the front-rear direction;
An automatic driving vehicle in which the vehicle automatically performs acceleration / deceleration and steering, and an automatic driving determination unit that determines that the vehicle is in automatic driving;
When the automatic driving determination unit determines that the vehicle is in automatic driving, a lock releasing unit that releases movement restriction in the front-rear direction of the seat by the lock mechanism;
In a state where the movement restriction of the seat is released by the unlocking portion, a load is applied to the leg portion when an occupant seated on the seat extends a leg portion by pressing a foot against the vehicle body and the seat moves backward. A load applying mechanism to be applied;
A vehicle seat, comprising: a load reducing mechanism that reduces a load on the legs by the load applying mechanism.   2. The vehicle seat according to claim 1, wherein the load applying mechanism includes an inclination guide portion that the vehicle rear side is inclined so as to be higher than the vehicle front side and the seat moves.   The vehicle seat according to claim 1, wherein the load reducing mechanism is a biasing force applying unit that applies a biasing force to the rear of the vehicle with respect to the seat.   The vehicle seat according to claim 3, wherein the biasing force applying means is an elastic member.   The vehicle seat according to claim 4, wherein the elastic member is a spring.   The vehicle seat according to claim 3, wherein the urging force applying means is an actuator.

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