JP2008254593A - Vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a sitter to smoothly sit on or leave a vehicular seat with an assist movement of an assist mechanism. <P>SOLUTION: The vehicular seat 1 is equipped with the assist mechanism for assisting the movement of the sitter P to sit on or leave the seat. Meanwhile the assist mechanism subducts the front part of a seat cushion 3 with its assist action, the assist mechanism causes a supporting posture of the vehicular seat 1 supporting a sitting posture to lean forward from a regular posture using the seat by displacing a tilt angle of a seat back 2 anteriorly. Accompanying the assist action of the assist mechanism, a hip point HP of the sitter P set to the vehicular seat 1 turns displaced downward from a regular position using the seat. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat provided with an assist mechanism that assists a seated person to move away from the seat.

  2. Description of the Related Art Conventionally, some vehicle seats are provided with a mechanism that assists an occupant's seating / seating operation when the vehicle gets on and off. For example, Patent Document 1 below discloses a technique that assists a seated person to move away from a seat by tilting the entire vehicle seat forward in a forward-turning manner when the vehicle gets on and off. In this disclosure, the entire vehicle seat is tilted forward with a hip point as a center, and the movement of the seated person can be reduced as much as possible to assist the operation of leaving the seat. .

JP 2005-247195 A

  However, in the prior art disclosed above, the seat back that is tilted backward is operated so as to be lifted forward around the hip point during the leaving assist operation. It will be pushed up in the direction approaching the ceiling surface. Therefore, when the occupant's physique is large, the head hits the ceiling surface during the assist operation described above, and there is a possibility that the operation of sitting and leaving cannot be performed smoothly.

  The present invention was devised as a solution to the above-described problems, and the problem to be solved by the present invention is to smoothly perform the seating / seating operation of the seated person with respect to the vehicle seat by the assist operation of the assist mechanism. It is to be able to do it.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
A first invention is a vehicle seat provided with an assist mechanism that assists a seated person to move away from a seat. The assist mechanism uses the assist operation to sink the front part of the seat cushion, which serves as the seating part, while shifting the tilt angle of the seat back, which serves as the backrest, to the seating posture of the vehicle seat. The support posture for supporting the seat is tilted forward from the normal seating use posture so that the seating person can assist in the operation of leaving the seat. Along with the assist operation of the assist mechanism, the hip point of the seated person set on the vehicle seat is displaced downward from the normal seating use position.
According to the first aspect of the invention, the front portion of the seat cushion sinks downward by the assist operation of the assist mechanism, and the inclination angle of the seat back is displaced forward. As a result, the support posture of the vehicle seat is tilted forward from the normal seating use posture, and the operation of the seated person leaving the seat is assisted. At this time, the hip point of the seated person (near the middle position of the adult seated person's femoral head) set in the vehicle seat is lowered downward from the normal seating use position along with the assist operation of the assist mechanism. Displace. As a result, the seating position itself of the seated person is dropped downward. For example, when assisting the leaving operation, the seating person's seating position is moved against the movement in which the seatback in the backward tilted position is lifted forward. The head is hard to hit the ceiling of the car body.

Next, in a second aspect based on the first aspect described above, the assist mechanism can separately perform an operation of sinking the front portion of the seat cushion downward and an operation of displacing the inclination angle of the seat back forward. It is like that.
According to the second aspect of the present invention, by allowing the front part of the seat cushion to be depressed and the seat back to be forwardly inclined separately, the support posture at the time of assisting the vehicle seat can be improved. It can be changed according to the physique.

Next, according to a third aspect, in the second aspect described above, the assist mechanism is configured to connect the front portion of the seat cushion to the base portion of the vehicle body floor, the seat main body, or the like so as to be movable up and down. And a tilting mechanism that connects the seat back to the base so as to be tiltable in the front-rear direction. The elevating mechanism is driven by an elevating drive device equipped with an electric motor. The tilting mechanism unit is driven by a tilting drive device including an electric motor different from the lifting drive device. The elevating drive device and the tilting drive device are configured such that their drive operations are performed independently.
According to the third aspect of the invention, the elevating mechanism part is driven by the elevating drive device, and moves the front part of the seat cushion up and down. Then, the tilt mechanism unit is driven by the tilt drive device to cause the seat back to tilt. These elevating drive devices and tilting drive devices use electric motors provided as drive sources, and drive operations are performed independently.

Next, in a fourth aspect based on the third aspect described above, the elevating mechanism is hinge-connected so that the seat cushion can be pivoted to the base at the rear position, and the rear position where the hinge is connected is the center. The front part of the seat cushion is moved up and down. The tilting mechanism portion is hinge-connected to the base portion so that the seatback is pivotable at the lower position thereof, and the seatback is tilted about the hinge-connected lower position. The hinge connecting portion of the seat cushion and the hinge connecting portion of the seat back are set to be coaxial with each other at a position rearward of the hip point of the seated person set on the vehicle seat.
According to the fourth aspect of the present invention, the seat cushion and the seat back are hinge-connected to each other at a position coaxial with each other at a position on the rear side of the hip point, while maintaining a tilted posture of the seat back with respect to the seat cushion. The support posture of the vehicle seat can be tilted forward.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first invention, the hip point is displaced downward in accordance with the assisting operation of the vehicle seat. The seating position itself can be lowered downward with respect to the movement that is lifted forward. As a result, the head of the seated person can be prevented from hitting the ceiling surface of the vehicle body, and the assisting operation of the assist mechanism can smoothly perform the seating / seating operation of the seated person with respect to the vehicle seat. it can.
Furthermore, according to the second aspect of the invention, the seat cushion can be supported at the time of assisting the vehicle seat by allowing the front part of the seat cushion to be depressed and the seat back to be inclined forward separately. It can be changed according to the physique. Thereby, it can adjust so that a seated person's seat-separation operation | movement can be performed more smoothly.
Furthermore, according to the third aspect of the present invention, since the electric motor provided with the elevating drive device and the tilting drive device is driven as a drive source, the load applied to each drive source is reduced and the elevating mechanism portion is reduced. And the tilting mechanism can be driven smoothly. And since it is not necessary to arrange | position the mechanism for transmitting motive power between each drive device or between mechanism parts, a structure can be simplified.
Further, according to the fourth invention, the seating posture of the seated person is set by setting the pivot center for moving up and down the front portion of the seat cushion and the pivot center for tilting the seat back to each other. The vehicle seat can be operated to assist without significantly breaking the angle. In addition, by setting the center of rotation to a position on the rear side of the hip point, the hip point can be easily dropped by the assist operation of the vehicle seat.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

First, the configuration of the vehicle seat 1 according to the first embodiment will be described with reference to FIGS.
Here, FIG. 2 shows a schematic configuration of the vehicle seat 1 of the present embodiment in a side view. The vehicle seat 1 is disposed as a rear seat of the vehicle, and includes a seat back 2 that serves as a backrest for a seated person P, a seat cushion 3 that serves as a seating portion, and a headrest 4 that supports the head. Have The seat back 2 and the seat cushion 3 are connected to a support base B fixedly installed on the vehicle body floor F. Here, the support base B corresponds to the base of the present invention. The back of the seat back 2 is supported by the rear surface portion R rising from the vehicle body floor F in an inclined manner, and the inclination angle is maintained. The headrest 4 is installed at an upper position of the seat back 2.

The vehicle seat 1 holds the supporting posture of the seat back 2 and the seat cushion 3 in a normal posture when the seated person P is seated and used, so that the seated person P can sit in a comfortable position. Yes. As shown in FIG. 1, when the seated person P is seated or leaves the vehicle seat 1, the seat back 2 and the seat cushion 3 are tilted forward in a forward-turning manner. It is like that. Thereby, the vehicle seat 1 can be moved so that the movement of the body weight when the seated person P is seated or leaves the seat can be reduced, and the seating / seating operation of the seated person can be assisted. . The assist movement operation of the vehicle seat 1 is performed by a movement that sinks the front portion of the seat cushion 3 downward and a movement that displaces the inclination angle of the seat back 2 forward.
Here, in the vehicle seat 1 described above, the hip point HP of the seated person P set in the vehicle seat 1 is displaced downward from the normal seating use state position in accordance with the movement of the assist movement. It is supposed to be. As a result, the seating position itself of the seated person P is dropped downward along with the assist movement of the vehicle seat 1. Therefore, for example, when the seated person P assists in the leaving operation, the head of the seated person P does not hit the ceiling surface of the vehicle body with respect to the movement in which the seat back 2 in the backward tilted position is lifted forward. Thus, the vehicle seat 1 can be operated.

Hereinafter, the structure of the assist mechanism for assisting the above-described vehicle seat 1 will be described.
The assist mechanism includes an elevating mechanism unit 10 that connects the seat cushion 3 to the support base B so as to be movable up and down, and a tilting mechanism unit 20 that couples the seat back 2 to the support base B so as to be tiltable. Have. The former elevating mechanism 10 is driven by an elevating drive device 30 that includes an electric motor 31. The latter tilting mechanism unit 20 is driven by a tilting drive device 40 including an electric motor 41 different from the electric motor 31 described above.
Here, FIG. 3 is a perspective view showing the configurations of the lifting mechanism unit 10 and the lifting drive unit 30. The elevating mechanism 10 includes an elevating plate 11 that supports the seat cushion 3 from below, and connecting links 12 and 12 that are linked to both sides of the front portion of the elevating plate 11.
The former elevating plate 11 has plate portions extending in a planar shape in the width direction at its front and rear portions, and is formed in a connecting plate shape in which both plate portions are integrally connected at the center position. . The elevating plate 11 is hingedly connected to support arms Ba and Ba by connecting shafts 11a and 11a, which are formed on both sides and extend rearward. These support arms Ba and Ba are integrally fixed to the support base B, respectively. At the rear end of the support base B, a support base Bs is provided that can catch the rotation of the rear part of the elevating plate 11 from below.
Here, the hinge connecting portion of the lifting plate 11 that is the connecting portion of the support shafts S, S is behind the hip point HP of the seated person P set in the vehicle seat 1 as shown in FIG. And it is set at the lower position.
And the latter connection links 12 and 12 are hingedly connected to the both sides of the front part of the raising / lowering board 11 by the support shafts 12a and 12a so that the edge part of those upper end side illustrations may rotate. Ends of the connecting links 12 and 12 on the lower end side in the figure are hingedly connected to nuts 35 and 35 that move back and forth of a lifting drive device 30 described later by support shafts 12b and 12b, respectively.

On the other hand, as shown in FIG. 4, the elevating drive device 30 includes an electric motor 31, shafts 32 and 32, connecting portions 33 and 33, screw shafts 34 and 34, and nuts 35 and 35.
Specifically, the screw shafts 34 are arranged at positions on both sides on the support base B so that the respective shafts extend in the front-rear direction. The screw shafts 34 and 34 are supported by the “B” -shaped brackets Bb and Bb fixedly installed on the support base B so as to be pivotable. Nuts 35 and 35, to which the lower ends of the above-described connecting links 12 and 12 are linked, are screwed to the screw shafts 34 and 34, respectively. As a result, the nuts 35 and 35 are moved in the axial length direction along with the movement of the screw shafts 34 and 34 so as to move the support connection points on the lower end side of the connection links 12 and 12 to the vehicle. The front seat 1 is moved in the front-rear direction.
The electric motor 31 is fixedly installed on the support base B at a lower position of the elevating plate 11. The electric motor 31 is connected to the screw shafts 34 and 34 through shafts 32 and 32 so as to be able to transmit power. The drive shafts rotate the screw shafts 34 and 34 at the same time. It is supposed to be. The shafts 32 and 32 and the screw shafts 34 and 34 are connected to each other using a meshing structure of a worm and a worm wheel inside the connecting portions 33 and 33.

The lifting / lowering drive device 30 configured as described above moves the nuts 35 and 35 forward or backward simultaneously by driving and rotating the electric motor 31 in one direction or the other direction. And the raising / lowering drive apparatus 30 hold | maintains each nut 35 and 35 in the position which moved each by stopping the drive rotation of the electric motor 31. FIG.
Therefore, the elevating drive device 30 holds the nuts 35, 35 at the positions moved forward relative to the screw shafts 34, 34 at the normal time when the vehicle seat 1 is seated and used. The connecting links 12, 12 can be held in an upright posture. Thereby, the front part of the raising / lowering board 11 can be hold | maintained as the state raised upwards, and the seat cushion 3 can be hold | maintained in the attitude | position position of a seating use state.
Then, from this state, the connecting links 12, 12 can be laid down by moving the nuts 35, 35 rearward by driving rotation of the electric motor 31. Thereby, the front part of the raising / lowering board 11 can be sunk below centering on the hinge connection part of the spindles S and S, and the seat cushion 3 can be switched to an assist attitude | position.

Next, returning to FIG. 2, the configuration of the tilting mechanism unit 20 and the tilting drive device 40 will be described. That is, the tilting mechanism unit 20 includes a tilting plate 21 that supports the seat back 2 from the back side, and brackets 22 and 22 that are fixedly installed on the back surface of the tilting plate 21.
The former tilting plate 21 is formed in a flat plate shape, and connecting arms 21a and 21a formed to extend forward from both sides of the lower end portion thereof are supported by the supporting shaft Ba and the supporting shaft Ba, respectively. It is hingedly connected to Ba. Thereby, the tilting plate 21 is supported so as to be rotatable at a position coaxial with the above-described lifting plate 11.
The latter brackets 22 and 22 are fixedly installed on the back surface of the tilting plate 21 as shown in FIG. The brackets 22 and 22 are hingedly connected to a tip end portion of a screw shaft 43 that moves in and out of a tilt drive device 40 described later by a support shaft 22a.

On the other hand, the tilt drive device 40 includes an electric motor 41, a bracket 42, and a screw shaft 43.
The tilt drive device 40 is provided embedded in a rear surface portion R that rises in an inclined manner from the vehicle body floor F. The screw shaft 43 is disposed so that the shaft extends in the front-rear direction with a slight upward adjustment. The screw shaft 43 is connected to the electric motor 41 using a meshing structure of a worm and a worm wheel inside the bracket 42. As a result, the screw shaft 43 is pushed forward in the axial direction or pulled back backward in accordance with the drive rotation of the electric motor 41.
The electric motor 41 is integrally connected to the bracket 42, and is integrally fixed to the rear surface portion R by a connecting arm 42 a formed on the bracket 42.

The tilt drive device 40 configured as described above moves the screw shaft 43 in and out of the axial direction forward or backward by driving and rotating the electric motor 41 in one direction or the other direction. And the tilting drive device 40 holds the screw shaft 43 at the moved position by stopping the driving rotation of the electric motor 41.
Therefore, when the vehicle seat 1 is seated and used, the tilt drive device 40 is in a posture state in which the tilt plate 21 is tilted rearward by holding the screw shaft 43 in the position where it is pulled back. Can be held. Thereby, the seat back 2 can be held at the posture position in the seating use state.
From this state, the tilting plate 21 can be tilted forward about the hinge connecting portions of the support shafts S and S by pushing and moving the screw shaft 43 forward by driving rotation of the electric motor 41. Thereby, the seat back 2 can be switched to the assist posture.

Note that the electric motor 41 of the tilt drive device 40 and the electric motor 31 of the lift drive device 30 described above, for example, perform a switching operation of a switch (not shown) disposed at a side position of the vehicle seat 1. These operating states can be switched. At this time, each of the electric motors 31 and 41 may be switched ON / OFF and forward / reverse at the same time by one switch operation, and may be switched individually. It may be.
For example, when the operating states of the electric motors 31 and 41 can be switched simultaneously by one switch operation, the seat back 2 and the seat cushion 3 can be operated simultaneously. Therefore, in this case, it is possible to change the support posture of the vehicle seat 1 while maintaining the tilt posture of the seat back 2 with respect to the seat cushion 3.
Further, when the operating states of the electric motors 31 and 41 are individually switched by separate switch operations, the sinking operation of the front portion of the seat cushion 3 and the forward tilting operation of the seat back 2 are separately performed. Can be done. Therefore, in this case, the support posture at the time of assisting the vehicle seat 1 can be changed by adjusting the movement amount of each of the seat back 2 and the seat cushion 3 according to the physique of the seated person P.
In addition, about the usage method of a present Example, since it demonstrated by the assist operation | movement of the vehicle seat 1 by the action | operation of the raising / lowering drive device 30 or the tilt drive device 40 mentioned above, it abbreviate | omits.

Thus, according to the vehicle seat 1 of the present embodiment, the hip point HP is displaced downward in accordance with the assist operation of the vehicle seat 1, and therefore, when assisting the away operation, The seating position itself can be lowered downward with respect to the movement in which the seatback 2 in the tilted posture is lifted forward. Accordingly, the head of the seated person P can be made difficult to hit the ceiling surface of the vehicle body, and the assisting operation of the assist mechanism can smoothly perform the seating / separating operation of the seated person P with respect to the vehicle seat 1. can do.
Furthermore, a lifting drive device 30 provided with the electric motor 31 and a tilt drive device 40 provided with the electric motor 41 are respectively provided to perform a sinking operation of the front portion of the seat cushion 3 and a forward tilting operation of the seat back 2. By being able to perform it separately, the support posture at the time of assisting the vehicle seat 1 can be changed in accordance with the physique of the seated person P. Thereby, it can adjust so that the operation | movement of the seated person P's seat leaving can be performed more smoothly.
Furthermore, by driving the electric motors 31 and 41 provided with the elevating drive device 30 and the tilt drive device 40 as drive sources, the load applied to each drive source is reduced, and the elevating mechanism unit 10 and tilting are performed. The mechanism unit 20 can be driven smoothly. And since it is not necessary to arrange | position the mechanism for transmitting motive power between each drive device or between mechanism parts, a structure can be simplified.
Furthermore, the seating posture of the seated person P is not greatly lost by setting the pivot center for moving the front portion of the seat cushion 3 up and down and the pivot center for tilting the seat back 2 to be coaxial with each other. The vehicle seat 1 can be assisted. In addition, by setting the rotation center at a position on the rear side of the hip point HP, the hip point HP can be easily dropped by the assist operation of the vehicle seat 1.

Although the embodiment of the present invention has been described with respect to one example, the present invention can be implemented in various forms in addition to the above-described example.
For example, the configuration in which the seat back is supported from the back side by the tilting plate of the tilting mechanism portion is shown, and the reclining device that adjusts the tilt angle between the seat back and the tilting plate when the seat back is seated and used. Can also be provided. Specifically, for example, a configuration in which the seat back is tilted between the tilt plate and the seat back by moving the screw shaft in and out in the axial direction by the driving rotation of the electric motor such as the tilt driving device shown in the above embodiment. By providing, a reclining device can be configured.
Moreover, you may make it drive a raising / lowering mechanism part and a tilting mechanism part with one drive device. However, in this case, since it is necessary to arrange a mechanism for transmitting power between the driving device and both the mechanism portions, the configuration may become large. In addition, since the load applied to the drive device is concentrated on one, it is also necessary to pay attention to the fact that each mechanism cannot be smoothly performed.

1 is a side view illustrating a schematic configuration of a vehicle seat according to a first embodiment. It is a side view showing the seating use state at the normal time of a vehicular seat. It is a perspective view showing the internal frame structure of the vehicular seat. It is the perspective view which looked at FIG. 3 from the IV line direction. It is the perspective view which looked at FIG. 3 from the V line direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 3 Seat cushion 4 Headrest 10 Elevating mechanism part 11 Elevating plate 11a Connection arm 12 Connection link 12a Support shaft 12b Support shaft 20 Tilt mechanism part 21 Tilt plate 21a Connection arm 22 Bracket 22a Support shaft 30 Lift drive device DESCRIPTION OF SYMBOLS 31 Electric motor 32 Shaft 33 Connection part 34 Screw shaft 35 Nut 40 Tilt drive device 41 Electric motor 42 Bracket 42a Connection arm 43 Screw shaft P Seated person HP Hip point F Vehicle body floor R Rear surface part B Support base (base part)
Bs Support stand Ba Support arm S Support shaft Bb Bracket

Claims (4)

A vehicle seat provided with an assist mechanism for assisting a seated person to move away from the seat,
The assist mechanism lowers the seat cushion posture of the vehicle seat by sunk the front part of the seat cushion serving as the seating portion by the assisting operation while displacing the inclination angle of the seat back serving as the backrest. The support posture to be supported is tilted forward from the normal seating usage state, and it is designed to be an assist posture that can assist the seated person to move away from the seat,
With the assist operation of the assist mechanism, the hip point of the seated person set in the vehicle seat is displaced downward from the normal seating use position. Sheet. The vehicle seat according to claim 1,
The vehicle seat according to claim 1, wherein the assist mechanism can separately perform an operation of sinking a front portion of the seat cushion downward and an operation of displacing the inclination angle of the seat back forward. The vehicle seat according to claim 2,
The assist mechanism is
An elevating mechanism for connecting the front portion of the seat cushion to the base of the vehicle body floor, the seat main body, and the like so as to be movable up and down;
A tilt mechanism that connects the seat back to the base so as to be tiltable in the front-rear direction; and
The elevating mechanism unit is driven by an elevating drive device having an electric motor, and the tilting mechanism unit is driven by a tilt drive device having an electric motor different from the elevating drive device. The vehicular seat is characterized in that the elevating drive device and the tilting drive device are driven independently of each other. The vehicle seat according to claim 3,
The elevating mechanism is configured such that the seat cushion is hingedly connected to the base at a rear position so as to be pivotable, and the front portion of the seat cushion is moved up and down around the hinge-connected rear position. And
The tilting mechanism portion is hinged to the base portion so that the seatback is pivotable at the lower position, and the seatback is configured to tilt and move around the hinge-connected lower position.
The hinge connection part of the seat cushion and the hinge connection part of the seat back are set to be coaxial with each other at a position on the rear side of the hip point of the seated person set on the vehicle seat. Vehicle seat.

Images