JP2009255643A - Seat for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat for a vehicle devised not to give a sense of incongruity to an occupant by reducing a difference between the rising speed and lowering speed of a seat cushion without using a motor of a high output type and capable of saving energy and improving a layout property of elevating drive. <P>SOLUTION: This seat for the vehicle is provided with a body side frame 20 mounted on a body, a cushion side frame 30 supported on the body side frame 20 free to elevate, the elevating drive 40 having a motor to elevate and drive the cushion side frame 30 and an energizing member 55 to energize the cushion side frame 30 in the rising direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle seat configured such that a seat cushion moves up and down.

Conventionally, as this type of vehicle seat, for example, as disclosed in Patent Document 1, a vehicle body side frame that is attached to the vehicle body via a seat slide device, and a seat that is supported by the vehicle body side frame so as to be movable up and down There has been known one provided with a cushion and a lift drive device having a motor for driving the seat cushion to move up and down. In this device, the rotational force output from the lifting drive is transmitted to the member on the seat cushion side by the link mechanism, so that the seat cushion can be lifted and lowered to adjust the seating position of the occupant. Yes.
JP-A-10-157498

  By the way, in the vehicle seat disclosed in Patent Document 1, it is common to adjust the seating position while the passenger is seated. If an occupant is seated at the time of adjustment, a force against the occupant's weight is required to raise the seat cushion, so that a large load is applied to the motor. On the other hand, when the seat cushion is lowered, the motor is not so heavily loaded. That is, when the seating position is adjusted, the difference between the ascending speed and the descending speed of the seat cushion tends to increase. If the speed difference is large, for example, when the occupant raises the seat cushion too much during adjustment, the descent speed is faster than the occupant's expectation, and the user feels uncomfortable. Therefore, it is conceivable to reduce the speed difference from the descent by increasing the speed at the time of ascent when the motor is of a high output type.

  However, the high-power type motor consumes a large amount of power, and it is difficult to save energy, which has been particularly demanded in recent years. In addition, since such a motor is large and heavy, it is difficult to determine an arrangement site when arranging the lifting / lowering drive device on the seat, resulting in poor layout.

  The present invention has been made in view of such a point, and the object of the present invention is to reduce the difference between the rising speed and the falling speed of the seat cushion without using a high-output type motor and to make the passenger feel uncomfortable. Therefore, energy saving is achieved and the layout of the lifting drive device is improved.

  In order to achieve the above object, in the present invention, the seat cushion side frame is urged in the upward direction by a force different from that of the motor.

  Specifically, in the first invention, the vehicle body side frame attached to the vehicle body, the seat cushion side frame supported so as to be movable up and down by the vehicle body side frame, and a motor for driving the seat cushion side frame to move up and down. A driving device and a biasing member that biases the seat cushion side frame in the upward direction are provided.

  According to this configuration, the urging force of the urging member acts in the direction of raising the seat cushion side frame, so that the raising speed of the seat cushion can be increased and the lowering speed can be increased without using a motor of a high output type. The difference can be reduced.

  In the second invention, in the first invention, the elevating drive device is arranged on one side in the width direction of the seat cushion, and the urging member is arranged on the other side in the width direction of the seat cushion.

  According to this configuration, the elevating drive device and the urging member are disposed apart from each other in the width direction, and therefore, it is easier to secure a mounting space as compared with the case where they are disposed together.

  According to a third aspect, in the second aspect, the output shaft of the elevating drive device is connected to one side in the width direction of the seat cushion side frame, and the biasing member is connected to the other side in the width direction of the seat cushion side frame. The configuration is as follows.

  According to this configuration, the output of the elevating drive device is transmitted to one side in the width direction of the seat cushion side frame, and the urging force of the urging member is transmitted to the other side in the width direction of the seat cushion side frame. As a result, the reaction forces of the elevating drive device and the urging member are dispersed, and an excessive force does not easily act on a part.

  In a fourth invention, in any one of the first to third inventions, the vehicle body side frame is provided with a link member that swings in a vertical direction, and one end side of the link member is connected to the seat cushion side frame. A driven tooth is formed on the other end side of the link member, and a drive gear meshing with the driven tooth is fixed to the output shaft of the elevating drive device.

  According to this configuration, when the elevating drive device is operated, the rotational force of the output shaft is transmitted to the link member having the driven teeth that mesh with the drive gear. As a result, the link member swings in the vertical direction, and the seat cushion side frame connected to the link member moves up and down. That is, the link member can be used as a gear for transmitting the output of the elevating drive device.

  According to the first aspect of the invention, since the urging member that urges the seat cushion side frame in the upward direction is provided, the difference between the ascending speed and the descending speed of the seat cushion is reduced even if the output of the motor is small. be able to. Thereby, even if it uses a low output motor, it can prevent a passenger | crew from feeling strange, Therefore Energy saving can be achieved and the layout property of a raising / lowering drive apparatus can be made favorable.

  According to the second aspect of the invention, the elevating drive device is arranged on one side in the width direction of the seat cushion and the urging member is arranged on the other side in the width direction, so that a space for attaching these can be easily secured. be able to.

  According to the third aspect of the invention, the output shaft of the lifting / lowering drive device is connected to one side in the width direction of the seat cushion side frame, and the urging member is connected to the other side in the width direction of the seat cushion side frame. The reaction force of the urging member can be dispersed, and the durability can be improved.

  According to the fourth aspect of the invention, the vehicle body side frame is provided with the link member that swings in the vertical direction, one end portion of the link member is connected to the seat cushion side frame, and the other end side of the link member is connected to the lifting drive device. Since the driven gear meshed with the drive gear fixed to the output shaft is formed, the link member can be used as a gear, and the number of parts can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a skeletal structure of a vehicle seat 1 according to an embodiment of the present invention. The seat 1 includes a seat cushion side skeleton structure 3 in which a seat cushion 2 is provided, and a seat back side skeleton structure 5 constituting a seat back 4, and in a vehicle interior (not shown) of an automobile, The seat cushion side skeleton structure 5 is attached to a floor panel (not shown) via a left slide device 6 and a right slide device 7 (shown in FIG. 2). The seat cushion side skeleton structure 3 is configured so that the seat cushion 2 can be raised and lowered, and the seat back side skeleton structure 5 is configured so that the seat back 4 can be tilted. In addition to the driver's seat, the seat 1 can also be used as a passenger seat, a seat for the second row or the third row of the RV vehicle. In the description of this embodiment, for convenience of explanation, the front side of the vehicle is simply referred to as “front”, the rear side is simply referred to as “rear”, the left side is simply referred to as “left”, and the right side is simply referred to as “ “Right”.

  The seat back side skeleton structure 5 includes a back frame 10 that supports a cushioning material for the seat back 4, a headrest frame 11 that supports a headrest 8 provided so as to protrude upward from an upper end portion of the back frame 10, and a back And a reclining mechanism 12 provided at the lower end of the frame 10. The back frame 10 is attached to the rear end portion of the seat cushion side skeleton structure 3 via the reclining mechanism 12, and the seat back side skeleton structure 5 is tilted in the front-rear direction around the lower end portion. . Reference numeral 13 in FIG. 1 is an operation lever for releasing the lock of the reclining mechanism 12.

  The left slide device 6 (shown in FIG. 1) and the right slide device 7 (shown in FIG. 2) are respectively engaged with the lower rails 6a, 7a extending in the front-rear direction and movably in the front-rear direction with respect to the lower rails 6a, 7a. Upper rails 6b and 7b are provided. The left and right lower rails 6a and 7a are respectively fixed to the floor panel. The upper rails 6b and 7b are locked at desired positions with respect to the lower rails 6a and 7a by a lock mechanism (not shown). Therefore, the position of the seat 1 can be adjusted in the front-rear direction.

  The seat cushion side skeleton structure 3 includes a vehicle body side frame 20 that is attached to the vehicle body via left and right slide devices 6 and 7, and a cushion side frame 30 that is supported by the vehicle body side frame 20 so as to be movable up and down. . As shown in FIG. 3, the vehicle body side frame 20 has a rectangular frame shape as a whole, and connects the left side plate member 21 attached to the left upper rail 6b and the right side plate member 22 attached to the right upper rail 7b. A front bar 23 and a rear bar 24 extending in the direction.

  The left side plate 21 is formed so as to rise substantially vertically from the upper surface of the left upper rail 6b and extend in the front-rear direction. Similarly, the right side plate member 23 is formed to extend in the front-rear direction. The front bar 23 is composed of a round bar extending in the left-right direction. The left end of the front bar 23 is rotatably inserted into an insertion hole (not shown) formed in the front end of the left plate 21, and the right end is an insertion hole formed in the front end of the right plate 22. (Not shown) is rotatably inserted. Further, the left end portion of the rear bar 24 is inserted into an insertion hole (not shown) formed in the rear end portion of the left plate 21, and the right end is inserted in the rear end portion of the right plate 22. It is inserted through a hole (not shown). The left end of the rear bar 24 protrudes from the left plate 21 to the left, and the right end also protrudes from the right plate 22 to the right. The left side plate 21 and the right side plate 22 are connected by a front bar 23 and a rear bar 24.

  The cushion side frame 30 includes a left side plate 31 extending substantially parallel to the left side plate 21 of the vehicle body side frame 20, a right side plate 32 extending substantially parallel to the right side plate 22 of the vehicle body side frame 20, and the left side plate 31 and the right side plate 32. And a connecting member 33 for connecting the two. The connecting member 33 is composed of a round bar that extends substantially parallel to the front bar 23. The left end portion of the connecting member 33 is inserted through an insertion hole (not shown) formed at the front end portion of the left side plate member 31, and the right end portion is inserted through an insertion hole (not shown) formed at the front end portion of the right side plate member 32. Is inserted. The connecting member 33 is fixed so as not to rotate with respect to the left side plate member 31 and the right side plate member 32.

  An insertion hole (not shown) through which the left end portion of the rear bar 24 is rotatably inserted is formed at the rear end portion of the left plate 31. An insertion hole (not shown) through which the right end portion of the rear bar 24 is rotatably inserted is formed in the rear end portion of the right side plate member 32. Therefore, the front side of the cushion side frame 30 rotates in the vertical direction with the axis of the rear bar 24 as the rotation center, and the seat cushion 2 moves up and down by this operation.

  As shown in FIG. 1, the left side plate member 21 of the vehicle body side frame 20 is provided with a lifting drive device 40 for moving the seat cushion 2 up and down. The elevating drive device 40 is a well-known device having an electric motor and a speed reducer, and is directly fixed to a portion on the left side of the left plate 21 by a fastening member (not shown) on the rear side of the front bar 23. Yes. The elevating drive device 40 has a shape that is long in the front-rear direction.

  As shown in FIG. 3, the output shaft 40 a of the lifting drive device 40 protrudes to the right side. An output shaft insertion hole (not shown) through which the output shaft 40a is inserted is formed in a portion corresponding to the output shaft 40a of the left side plate member 21. The distal end portion of the output shaft 40a protrudes to the right side of the left plate 21 through the output shaft insertion hole. A drive gear 41 is fixed to the tip of the output shaft 40a. In addition, although not shown in figure, the raising / lowering drive apparatus 40 is supplied with an electric current from the battery of a vehicle. The motor can be switched between forward rotation and reverse rotation by operating a switch provided in the middle of the wiring between the lifting drive 40 and the battery.

  As shown in FIG. 1, a left first link member 45 extending substantially in the front-rear direction is attached to the left side of the front bar 23. The left first link member 45 is disposed on the right side of the left plate 21. As shown in FIG. 3, the left side of the front bar 23 penetrates the middle portion of the left first link member 45 in the longitudinal direction (front-rear direction). The left first link member 45 is fixed so as not to rotate with respect to the front bar 23. A connecting pin 47 to which the left second link member 46 is connected is inserted through the front end portion of the left first link member 45. As shown in FIG. 1, the rear side of the first left link member 45 is formed such that the vertical dimension is longer than that of the front side. The rear edge portion of the left first link member 45 is formed in an arc shape centered on the axis of the front bar 23. A driven tooth 45 a that meshes with the drive gear 41 is formed continuously at the rear edge of the left first link member 45.

  The left second link member 46 is disposed so as to extend substantially in the vertical direction. The connecting pin 47 is rotatably inserted into the lower end portion of the left second link member 46. The connecting rod 33 of the cushion side frame 30 is inserted through the upper end portion of the left second link member 46. The left second link member 46 is fixed so as not to rotate with respect to the connecting bar 33.

  On the other hand, as shown in FIG. 3, a right first link member 49 extending in the front-rear direction is attached to the right side of the front bar 23 in the same manner as the left first link member 45. The right first link member 49 is disposed on the left side of the right plate member 22. The right end portion of the front bar 23 penetrates the rear side of the right first link member 49. The right first link member 49 is fixed so as not to rotate with respect to the front bar 23. A right second link member 51 is connected to the right first link member 49 by a connecting pin 50. The right second link member 51 is fixed in the same manner as the left second link member 46.

  A biasing member 55 that biases the cushion side frame 30 in the upward direction is provided on the right surface of the right side plate member 22. As shown in FIG. 2, the urging member 55 is formed by winding a plate-shaped spring steel material in a spiral shape, and is arranged so that the center thereof substantially coincides with the axis of the front bar 23. . A groove extending in the radial direction is formed at the right end of the front bar 23. An engagement piece 55a formed at the center of the urging member 55 is fitted in this groove, and the center of the urging member 55 and the front bar 23 are integrated. A fixing portion 55b that is curved in a U shape is provided at the outer end of the urging member 55 in the winding direction. A pin 56 to which the fixing portion 55b of the urging member 55 is fixed projects from the right side plate member 22 toward the right side. The front bar 23 is urged counterclockwise in FIG. 2 by the urging member 55, and this urging force is applied to the cushion side frame 30 via the first link members 45 and 49 and the second link members 46 and 51. It acts as a force in the upward direction.

  Next, the case where the height adjustment of the seat cushion 2 of the seat 1 configured as described above is performed will be described. At the time of adjustment, when an occupant is seated and the switch is operated in the direction in which the seat cushion 2 is raised, the motor of the elevating drive device 40 rotates and the drive gear 41 rotates counterclockwise in FIG. Then, the left first link member 45 is rotated so that the front side moves upward, whereby the front bar 23 is rotated and the right first link member 49 is also rotated in the same direction. As the left and right first link members 45 and 49 rotate, the left and right second link members 46 and 51 move upward, and the cushion side frame 30 rotates the rear bar 24 as shown in FIG. It turns upward as the center of movement. Thereby, the seat cushion 2 rises.

  On the other hand, when the switch is operated in the direction in which the seat cushion 2 is lowered, the motor reversely rotates, and the left and right first link members 45 and 49 rotate so that the front side moves downward. The second link members 46 and 51 move downward, and the cushion side frame 30 rotates downward about the rear bar 24 as a rotation center. Thereby, the seat cushion 2 descends.

  When the seat cushion 2 is raised, the cushion side frame 30 is urged upward by the urging member 55, so that the output of the motor can be supplemented by the urging force. Therefore, when a low output type motor is used, it is possible to increase the ascent speed of the seat cushion 2 and reduce the difference from the descending speed.

  As described above, according to the seat 1 according to this embodiment, since the urging member 55 that urges the cushion side frame 30 in the upward direction is provided, even if the output of the motor is small, the seat cushion 2 The difference between the ascending speed and the descending speed can be reduced. Thereby, even if it uses a low output motor, it can prevent a passenger | crew from feeling strange, Therefore Energy saving can be achieved and the layout property of the raising / lowering drive apparatus 40 can be made favorable.

  In addition, since the elevating drive device 40 is arranged on the left side of the seat 1 and the urging member 55 is arranged on the right side, it is possible to easily secure a space for attachment as compared with the case where these are arranged together. Can do.

  Further, since the output of the elevating drive device 40 is transmitted to the left side of the cushion side frame 30, and the urging force of the urging member 55 is transmitted to the right side of the cushion side frame 30, each reaction force can be dispersed. it can. Thereby, excessive force does not act on each part of the vehicle body side frame 20, and durability can be improved.

  In addition, since the driven teeth 45a are formed on the left first link member 45 and used as a gear for transmitting the output of the elevating drive device 40, the number of parts can be reduced.

  In the above embodiment, the urging member 55 is constituted by a spiral spring. However, the urging member 55 is not limited to this, and for example, the cushion side frame 30 may be urged upward by a coil spring or a gas spring. You may make it bias with the torsion bar (torsion bar) which has a restoring force with respect to torsional force.

  As described above, the vehicle seat according to the present invention is suitable for being disposed, for example, in a driver seat or a passenger seat of an automobile.

It is a left view which shows the frame | skeleton structure of a vehicle seat. It is a right view which shows the frame | skeleton structure of a vehicle seat. It is a top view of a seat cushion side skeleton structure. FIG. 2 is a view corresponding to FIG. 1 in a state where the seat cushion is in a raised position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 20 Car body side frame 30 Cushion side frame 40 Elevating drive device 40a Output shaft 41 Drive gear 45 Left first link member 45a Drive tooth 55 Energizing member

Claims (4)

A vehicle body side frame attached to the vehicle body;
A seat cushion side frame supported by the vehicle body side frame so as to be movable up and down;
An elevating drive device having a motor for elevating and driving the seat cushion side frame;
A vehicular seat comprising: an urging member that urges the seat cushion side frame in the upward direction. The vehicle seat according to claim 1,
The lifting drive is arranged on one side of the seat cushion in the width direction,
The urging member is disposed on the other side in the width direction of the seat cushion. The vehicle seat according to claim 2,
The output shaft of the lifting drive is connected to one side in the width direction of the seat cushion side frame,
The urging member is connected to the other side in the width direction of the seat cushion side frame. In the vehicle seat according to any one of claims 1 to 3,
The vehicle body side frame is provided with a link member that swings in the vertical direction.
One end side of the link member is connected to the seat cushion side frame,
A driven tooth is formed on the other end side of the link member,
A vehicle seat characterized in that a drive gear meshing with the driven tooth is fixed to an output shaft of the elevating drive device.

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