JP2000071823A - Vertically moving device for vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain optimization of an adjustment range, maintenance of cushion capability, easy mounting and wiring, downsizing, and easy maintenance. SOLUTION: This device is provided with a vertically moving mechanism which vertically-moves the front part and the rear part of a vehicle seat independently, and the vertically moving mechanism is activated by two of a rear motor 34 and a front motor 35. A rear link and a front link are disposed respectively on the right and left sides of the vertically moving device, the right and left sides of the rear link and the front link are connected respectively by a rear operation connecting shaft 25 and a front side operating connecting shaft 31, and driven gears 32, 33 are fixed respectively to the rear operation connecting shaft 25 and the front operation connecting shaft 31, and output gears 36, 37 to which the rotation of the rear motor 34 and the front motor 35 are transmitted are engaged respectively with the respective driven gears 32, 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical movement device for a vehicle seat.

[0002]

2. Description of the Related Art Conventionally, Japanese Utility Model Publication No. 1-37936 discloses a vertical movement mechanism for raising and lowering a rear portion of a vehicle seat.
The vertical movement mechanism has a structure in which links are respectively arranged on the left and right, the left and right links are respectively connected by an operation connection shaft, the base of the arm is fixed to the operation connection shaft, and the tip of the arm is rotated by a motor. Is described.

[0003]

The above-mentioned known example has a problem in that the operating connection shaft is rotated by an arm. That is,
In order to rotate the operation connection shaft by the arm, the amount of rotation of the arm increases, and a large operation space is required. In the known example, the tip of the arm is directly rotated by the worm gear device. However, in this case, the rotation range is limited and the adjustment range is limited. Further, in the known example, since the motor is provided at a position below the center of the vehicle seat, there is also a problem that the cushioning property is impaired. In the present invention, the rotation transmitting mechanism is devised to improve the cushioning property.

[0004]

The object of the present invention is to make the adjustment range appropriate, maintain the cushioning property, facilitate installation, wiring, downsize, and facilitate maintenance.

[0005]

According to the present invention, there is provided a vertical movement mechanism for independently raising and lowering a front portion and a rear portion of a vehicle seat. The vertical movement mechanism includes two rear motors 34 and a front motor 35.
The vertical movement device comprises a rear link R and a front link F on the left and right, respectively.
, Respectively, and the left and right rear links R and the front links F
Are connected by a rear working connecting shaft 25 and a front working connecting shaft 31, respectively. Passive gears 32 and 33 are fixed to the rear working connecting shaft 25 and the front working connecting shaft 31, respectively. Reference numerals 33 denote output gears 36 and 37 to which the rotations of the rear motor 34 and the front motor 35 are transmitted, respectively, to form a vehicle seat up-down movement device. In the present invention, the passive gears 32 and 33 are connected to the rear-side operating connection shaft 2.
5 and a vertical movement device for a vehicle seat fixed to substantially the left and right intermediate portions of the front and rear operation connecting shafts 31, respectively.
The present invention is characterized in that the rear working connection shaft 25 and the front working connection shaft 31 are connected to the cushion frame 3 of the vehicle seat.
The vehicle seat vertical movement device is disposed below the front bottom plate 4b at predetermined intervals in front and rear. In the present invention, the rear motor 34 and the front motor 35
The rear working connection shaft 25 and the front working connection shaft 31
And a vertical movement device for a vehicle seat disposed approximately at the center in the left and right direction.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Denotes a vehicle seat, 2 denotes a cushion seat of the vehicle seat 1, and 3 denotes a cushion frame of the cushion seat 2. The cushion frame 3 has a lower bottom plate 4a below the buttocks of the seated person, a lower bottom plate 4b, and a higher front bottom plate 4b. The right and left sides of the bottom plate 4 are integrally provided with rising portions that rise upward. (Note that upright walls are provided before and after, but this is not a requirement). The right and left rising portions are formed to be inclined so as to gradually increase toward the outside. 6
Is a window hole provided in the bottom plate 4a, and is provided below the buttocks of a seated person. Side frames 7 are provided on the left and right sides of the cushion frame 3 over substantially the entire length of the rising portion. When viewed from the front, the side frame 7 has a substantially L-shaped structure including a horizontal plate portion 11 in which a lower end portion of the vertical plate portion 10 is bent inward. The side frame 7 may be integrally formed with the cushion frame 3 and is not a requirement.

Reference numeral 12 denotes a pair of left and right fixed frames, which may be fixed to the vehicle body frame or mounted so as to be movable in any direction. In the present embodiment, a so-called slide rail 13 is used. Of the fixed frame 12
Moves forward and backward with respect to the vehicle body, but is on the fixed side with respect to the side frame 7 that moves up and down. Reference numeral 15 denotes a lower rail of the slide rail 13. Thus, a vertical movement device for the cushion sheet 2 is provided between the left and right fixed frames 12 and the cushion frame 3 side. Front end portions of a pair of left and right rear turning arms 16 formed in an inverted triangular shape having a downwardly directed apex forming a part of a rear link R of the vertical motion device on the rear outer side of the left and right side frames 7. The movable side mounting shaft 17 is rotatable.
, And the rear end of each rear-side rotating arm 16 is pivotally attached to each fixed frame 12 by a fixed-side mounting shaft 18.

The side frames 7 corresponding to the lower ends of the rear turning arms 16 mounted outside the left and right side frames 7
A rear window portion 20 is formed on each of the horizontal plate portions 11, and rear ends of a pair of rods 21 in the front-rear direction are respectively set inside the rear window portion 20. Side rotation arm 1
6 are pivotally attached to the lower ends of the rods 6 by shafts 22, respectively. When the rear window portion 20 is formed integrally with the horizontal plate portion 11 of the side frame 7, the horizontal plate portion 1 is formed even when the rear rotation arm 16 rotates.
Does not interfere with 1. If the rear portion of the rod 21 is formed by bending downward, the position of the shaft 22 is set lower than the position of the moving-side mounting shaft 17, and the rear rotation is performed while the movement amount of the rod 21 is reduced. The arm 16 can be configured to rotate greatly.

The front ends of the right and left rods 21 are respectively mounted on the front ends of rear operation arms 23 by shafts 24. The base of each rear operation arm 23 is a rear operation connection shaft inside the side frame 7. 25, respectively, and the rear-side operating connection shaft 25
Are mounted on left and right side frames 7. The rear end of the front pivot arm 26, which forms a part of the front link F of the vertical movement device, is fixed to the front end of the fixed frame 12 by the fixed mounting shaft 27. Front rotating arm 2
6 is a side frame 7 in which the front end is inclined in a forward-lowering state.
To the outer side of the front window 28 formed in the front part. The inner surface of the front window portion 28 and the side frame 7
The front operating arm 29 faces the inside of the front arm 29, and the other end of the front-side rotating arm 26 is axially attached to the tip of the front operating arm 29 by an arm mounting shaft 30. The base of the front operation arm 29 is fixed to the front operation connection shaft 31, and both ends of the front operation connection shaft 31 are rotatably mounted on the side frame 7 only for rotation.

Therefore, one end of the front rotation arm 26 is attached to the fixed frame 12, but the other end is not attached directly to the side frame 7, but is attached to the front operation arm 29. The arm 26 forms the front link F. In this case, at least the arm mounting shaft 30 is always positioned below and in front of the fixed mounting shaft 27 so that a compression load is not applied to the front rotation arm 26. The front operation arm 29 rotates around the front operation connection shaft 31. At this time, the arm mounting shaft 30 moves in a circle around the front operation connection shaft 31 with reference to the front operation connection shaft 31. In addition, when viewed on the basis of the fixed-side mounting shaft 27, it moves circularly around the fixed-side mounting shaft 27. When the front operation arm 29 is rotated clockwise in the figure, the front operation connection shaft 31 moves upward with respect to the fixed side mounting shaft 27, and conversely, the front operation arm 2
When the pivot 9 rotates counterclockwise in the figure, the front working connection shaft 31 is configured to move downward with respect to the fixed mounting shaft 27. That is, a front operation arm 29 is provided on the cushion frame 3 side, and the front rotation arm 2 is attached to the front operation arm 29.
6, the fixed-side mounting shaft 27 alone is stationary, and the front-side working connecting shaft 31 and the arm-mounting shaft 30 move in a complicated manner, respectively. Without increasing the vertical width of the operation connection shaft 31 and the arm attachment shaft 30 in a side view, the cushion frame 3
Of the front link F can be reduced in size.

Therefore, the up-and-down moving device is provided with the rear link R
And a rod or an arm, which is a component member of the front link F, is disposed on each of the left and right sides, and the left and right rear links R and the front link F are connected by the rear operation connection shaft 25 and the front operation connection shaft 31, respectively. The rear link R and the front link F are operated by rotating the rear connection link 25 and the front connection shaft 31, respectively. Passive gears 32 and 33 are fixed to the rear working connection shaft 25 and the front working connection shaft 31, respectively.
The output gears 36 and 37 to which the rotations of the rear motor 34 and the front motor 35 are transmitted are meshed with each other. The rear working connection shaft 25 and the front working connection shaft 31 are disposed at predetermined intervals in front and rear below the front bottom plate 4b of the cushion frame 3, respectively.
3 is fixed to substantially the right and left intermediate portions of the rear working connection shaft 25 and the front working connection shaft 31, respectively, so that the balance of rotation transmission is improved and the load of torsion of each connection shaft 25, 31 is reduced. It is possible and suitable.

The rear motor 34 and the front motor 35 are provided in a case 40 made of synthetic resin, and a speed reduction mechanism from the rear motor 34 and the front motor 35 to the output gears 36 and 37, respectively. Is provided in the case 40.
41 is a rear output shaft of the rear motor 34; 42 is a front output shaft of the front motor 35; 43 is a motor output shaft gear (worm gear) fixed to the rear output shaft 41 and the front output shaft 42; Passive gears meshing with the output shaft gear 43, respectively, an intermediate shaft 45 on which the respective passive gears 44 are mounted;
6 is an intermediate gear for reduction provided separately on each intermediate shaft 45;
Is another intermediate shaft, and 48 is an intermediate gear that meshes with each intermediate gear 46 provided on each intermediate shaft 47, and the intermediate shaft 47 is provided with output gears 36 and 37, respectively. Therefore, since the operation drive mechanism is housed in the case 40, there are few failures and almost no maintenance is required. Further, since the operation drive mechanism is integrally assembled, the installation is easy. The case 40 is attached to the lower surface of the bottom plate 4b on the front side of the cushion frame 3 (therefore, the horizontal plate portion 1 of the side frame 7).
1 is positioned lower than the lower surface of the front bottom plate 4b), and the load of the occupant at the time of collision or the like is applied to the front side of the cushion frame 3 so that the case 40 receives the submarine phenomenon in which the occupant sinks. The effect of preventing can be expected.

When the rear motor 34 and the front motor 35 are positioned such that the front and rear output shafts 41 and 42 are positioned in the front and rear direction and opposite to each other, the respective output gears The case 36 and 37 can be arranged on the front and rear sides of the case 40, and the case 40 can be provided between the rear working connection shaft 25 and the front working connection shaft 31, so that the mounting space can be reduced. Therefore, it is preferable. When the motors 34 and 35 are arranged as described above, the case 4 on the side of the rear motor 34 and the front motor 35 is disposed.
0 can accommodate the intermediate shaft and the gear group of the reduction mechanism, and the case 40 can be downsized. Thus, in the embodiment, the rear working connection shaft 25 and the front working connection shaft 31 are penetrated into the case 40, and the rear working connection shaft 25 and the front working connection portion penetrating through the case 40. When the passive gears 32 and 33 are fixed to the shaft 31, respectively, and the respective passive gears 32 and 33 are meshed with the output gears 36 and 37 in the case 40, the respective operating connection shafts 25 and 31 and the operating mechanism are connected. The case 40 can be integrally assembled, and the assembling becomes easy, which is preferable.

In this case, when the case 40 is mounted on the lower surface side of the front bottom plate 4b of the cushion frame 3 by the mounting member 50, the case 40 is connected to the left and right intermediate portions of the rear operation connection shaft 25 and the front operation connection shaft 31. The function of the bearing for supporting the shaft can be expected, and the rotation is stable and suitable. In addition, a bulging portion 51 is provided substantially at the center of the bottom plate 4b on the front side of the cushion frame 3 of the embodiment so as to protrude upward.
A case 40 is provided below the mounting member 50, and the mounting member 50 is fixedly mounted on the bottom plate 4b by extending the front and rear ends thereof back and forth from the bulging portion 51. The bulging portion 51 supports the load of the submarine phenomenon in which the occupant sinks, and the case 40 supports the bulging portion 51 when deformed, thereby providing a reliable support configuration. Also,
Conversely, even if the mounting member 50 is omitted and the case 40 is mounted with the case 40 being inserted through the rear-side operation connection shaft 25 and the front-side operation connection shaft 31, even if the two rear-side operation connection shafts 25 and the front-side operation Since it is located between the connecting shafts 31, there is no problem. In this case, the mounting process can be simplified, which is preferable.

The rear motor 34 and the front motor 35 are
When energized, the front and rear portions of the seat are moved up and down. When energized, the rear working connection shaft 25 and the front working connection shaft 3 are turned off.
1 is locked, and the cushion sheet 2 is held at a predetermined position. Thus, if the rear operation arm 23 and the front operation arm 29 are provided integrally or separately with the excessive rotation preventing regulating member 52, the rear link R and the front link F of the vertical motion device are prevented from being mechanically locked. Yes (you can
In relation to the drawing, the regulating member 52 only regulates the front rotation of the front operation arm 29, but is not limited to this, and the rear rotation and the rear operation arm 23 of the front operation arm 29 are not limited to this. May be provided to regulate). In this case, if the sector gear for manual operation is diverted, the front and rear sides can be regulated and the cost can be reduced.

When the rear working connection shaft 25 and the front working connection shaft 31 are penetrated into the case 40 and the passive gears 32 and 33 are provided in the case 40, the passive gears 32 and 33 are respectively provided. Is formed in a sector shape like a sector gear, and a part of the case 40 is bulged inward to
3 is provided, and the engaging portion 53 operates in the same manner as the regulating member 52. Thus, the up-and-down moving device is mounted on the side frame 7.
A link is formed by the fixed frame 12, the rear rotation arm 16 and the front rotation arm 26. When the rear rotation arm 16 is rotated, the rear portion of the seat is moved up and down, and the front rotation arm 26 is moved. When rotated, the front part of the seat is raised and lowered, and when both the rear rotation arm 16 and the front rotation arm 26 are rotated, the entire sheet is raised and lowered. Further, the load applied to the seat is mainly at the rear portion of the seat, and a fixed side mounting shaft 18 serving as a rotation fulcrum of the side frame 7 is disposed near a lower portion of the portion where the load is applied, and a rear motor 34 and a front motor 35 are provided. To reduce the operation load.

[0017]

Next, the operation will be described. Sitting on the vehicle seat 1,
When the rear motor 34 is energized, the rear working connecting shaft 25 rotates to rotate the rear working arm 23 about the rear working connecting shaft 25, and the rear working arm 23 pulls the rod 21 forward. . The rod 21 rotates the rear rotating arm 16 clockwise about the fixed mounting shaft 18 in the figure, the moving mounting shaft 17 moves up with respect to the fixed mounting shaft 18, and the rear portion of the cushion seat 2 moves up. . When power is supplied to the rear motor 34 in the opposite direction, the rear portion of the cushion sheet 2 is moved downward. When the front motor 35 is energized, the front working connecting shaft 31 rotates to rotate the front working arm 29 around the front working connecting shaft 31, and the front working arm 29 connects the arm mounting shaft 30 for the front side. It is rotated clockwise in the figure around the operating connection shaft 31. When the front operation arm 29 is rotated around the front operation connection shaft 31, the arm mounting shaft 30 moves circularly around the front operation connection shaft 31 when viewed from the front operation connection shaft 31, but at the same time, Since the arm mounting shaft 30 moves circularly about the fixed mounting shaft 27, the front-side working connection shaft 31 and the arm mounting shaft 30 are different from the fixed mounting shaft 27 with respect to the fixed mounting shaft 27. When the vehicle is descended, the front working connection shaft 31 moves upward, so that the side frame 7 to which the front working connection shaft 31 is attached and thus the front portion of the cushion seat 2 are moved upward.

When the front motor 35 is energized in the opposite direction, the arm mounting shaft 3 is viewed from the fixed mounting shaft 27 as a reference.
0 generally moves upward with respect to the fixed-side mounting shaft 27 to lower the front-side working connection shaft 31.
Move down the front of the. The arm mounting shaft 30 is always located below and forward of the fixed mounting shaft 27, and the front operating arm 29 connecting the front operating connecting shaft 31 and the arm mounting shaft 30 is rotated clockwise in FIG. When the front operation connection shaft 31 is moved, the front operation connection shaft 31 is moved upward with respect to the fixed side mounting shaft 27. Conversely, when the front operation arm 29 is rotated counterclockwise in the drawing, the front operation connection shaft 31 Since it is arranged so as to move downward with respect to the fixed side mounting shaft 27, the vertical width of the front working connection shaft 31 and the arm mounting shaft 30 can be made as small as possible with respect to the vertical width of the seat, thereby improving the operating efficiency. As a result, the accommodation space can be reduced, and only the pulling load is applied to the front rotation arm 26, so that it can be made thinner and thinner, and the vertical movement device can be made smaller, and the space can be effectively used.

The front pivot arm 26 has a front end pivotally attached to the movable side frame 7 lower than the fixed side portion pivotally attached to the fixed frame 12 in a forward downward direction. Indicates that the tensile strength is stronger than the compressive buckling load, and the load applied to the seat is
Since the load is a pulling load for pulling the front rotation arm 26 downward through the, and not a compression load, the thickness of the front rotation arm 26 can be reduced, and the weight can be reduced. In addition, the fixed frame 12
The front rotation arm 26 may be formed to have a length that allows the front rotation arm 26 and the rear rotation arm 16 to be pivotally attached. The front rotation arm 26 has a rear end pivotally attached to the fixed frame 12 and a front end pivotally attached to the side frame 7. Therefore, the fixed frame 12 is
The front part of the fixed mounting shaft 27 can be omitted, and the fixed frame 12 can be reduced in size and weight.

As described above, the up-and-down moving device for the cushion sheet 2 includes the rear link R and the front link F on the left and right, respectively.
, Respectively, and the left and right rear links R and the front links F
Are connected by a rear working connecting shaft 25 and a front working connecting shaft 31, respectively. Passive gears 32 and 33 are fixed to the rear working connecting shaft 25 and the front working connecting shaft 31, respectively. 32 and 33 include a rear motor 34 and a front motor 35.
Are transmitted, the rotation of the rear motor 34 and the front motor 35 is transmitted to the rear operation connection shaft 25 and the front operation connection shaft 31, respectively. As described above, the rear link R and the front link F are operated respectively, and the rotations of the rear motor 34 and the front motor 35 are transmitted to the passive gears 32 and 33.
When rotation is transmitted to the rear-side operation connection shaft 25 and the front-side operation connection shaft 31, it is possible to prevent twisting. That is, when the operating connection shaft is rotated by the arm, the torsional stress concentrates only on the fixed portion between the arm and the operation connection shaft, but the passive gears 32 and 33, the rear operation connection shaft 25, and the front operation connection shaft are concentrated. The "fixed surface" with 31 can support the torsional load and reduce the torsional load. Further, since the transmission is not performed by the link mechanism as in the prior art, the working space can be reduced, and the assembling becomes easy. In addition, since the output gears 36 and 37 and the passive gears 32 and 33 are merely rotated, the working space is reduced. The same can be used to extend the adjustment range.

The output gears 36 and 37 and the passive gear 3
Since the motor and the speed reduction mechanism may be arranged in any manner except for the restriction on the engagement of the gears 2 and 33, the degree of freedom in design can be improved and the cushion performance can be improved. That is, the rear-side working connection shaft 25 and the front-side working connection shaft 31 can be arranged at predetermined intervals in front and rear below the front bottom plate 4b of the cushion frame 3, respectively. The space below the thigh can be effectively used, and the cushion performance can be improved. Further, the rear working connection shaft 25 and the front working connection shaft 31 also serve as the working shaft and the interlocking shaft for interlocking the left and right rear working arms 23 and the front working arm 29, so that the number of parts can be reduced.

However, as described above, since the arrangement of the motors and the like is free, the passive gears 32 and 33 are substantially left and right of the rear working connection shaft 25 and the front working connection shaft 31, respectively. Can be fixed to the middle part. Therefore, it is possible to rotate substantially the right and left intermediate portions of the rear working connection shaft 25 and the front working connection shaft 31, respectively, and to generate a force (torque) for operating the left and right rear links R and the front links F. It is possible to make the same, to reduce the torsional load of each connecting shaft 25, 31, and to improve the right and left balance of the load applied by the left and right rear link R and the front link F, and to operate smoothly and reliably. it can. In addition, the passive gears 32 and 33, the rear working connection shaft 25, and the front working connection shaft 31 are provided below the thigh of the seated person with little vertical load, so that the cushioning performance is not reduced. The rear motor 34 and the front motor 35 are provided in a case 40 made of synthetic resin, and the output gear 3 is provided from each of the rear motor 34 and the front motor 35.
Since the deceleration mechanism reaching 6, 37 is provided in the case 40, the operation drive mechanism is housed in the case 40.
There are few failures, almost no maintenance is required,
Since they are integrally assembled and assembled, installation is easy.
Further, since the case 40 is attached to the lower surface of the bottom plate 4b on the front side of the cushion frame 3, the submarine phenomenon in which the occupant sinks due to the load of the occupant being applied to the front side of the cushion frame 3 at the time of a collision or the like is provided by the case 40. The effect of preventing by receiving a load can also be expected.

Since the rear motor 34 and the front motor 35 are positioned such that the front and rear output shafts 41 and 42 are positioned in the front and rear direction and opposite to each other, the respective output The gears 36 and 37 can be arranged on the front and rear sides of the case 40. Therefore, the case 40 can be provided between the rear-side operation connection shaft 25 and the front-side operation connection shaft 31, and the mounting space is reduced, which is preferable (also, the output gears 36 and 37). And the reduction of the working space due to the rotation of the passive gears 32 and 33 has a great effect.)
. When the motors 34 and 35 are arranged as described above, the intermediate shaft and the gear group of the speed reduction mechanism can be accommodated in the case 40 on the side of the rear motor 34 and the front motor 35, and the case 40 can be reduced in size. And is suitable.

The rear motor 34 and the front motor 3
5 is a rear working connection shaft 25 and a front working connection shaft 31 because the front and rear output shafts 41 and 42 are located in the front and rear direction and opposite to each other.
The case 40 can be arranged between them. That is, if the output shafts are arranged in the same direction, two output shafts are inevitably arranged close to each other, or the rotation transmission configuration becomes complicated, but since the output shafts are arranged in the opposite direction, The two motors 34, 35 and the transmission mechanism can be rationally arranged between the side working connection shaft 25 and the front side working connection shaft 31. Moreover, as described above, the case 40 can be disposed between the rear-side operation connection shaft 25 and the front-side operation connection shaft 31. Therefore, in the embodiment, the rear-side operation connection shaft 25 and the The front working connection shaft 31 can be penetrated, so that the rear working connection shaft 25 and the front working connection shaft 3 that penetrate into the case 40 can be formed.
1 and passive gears 32 and 33 respectively fixed to the output gear 3
Since the gears 6 and 37 are engaged with each other in the case 40, the respective operation connection shafts 25 and 31 and the operation mechanism can be integrally assembled in the case 40, and the assembly is facilitated, which is preferable.

Each of the operating connecting shafts 25 and 25 is provided on the side of the rear motor 34 and the front motor 35 in the case 40, respectively.
Since the speed reduction mechanism 31 is provided, it can be stored in the small case 40. Therefore, the case 40 can be attached to the left and right centers of the lower surface of the front bottom plate 4b formed higher than the rear bottom plate 4a of the cushion frame 3, and the space can be effectively used. Case 4
0 can be attached to the center of the lower surface of the front bottom plate 4b of the cushion frame 3, does not interfere with the zigzag spring, and does not impair the cushioning property. That is, when the motors are respectively provided at the center and the left and right sides of the cushion frame 3 as in the related art, they may interfere with the zigzag spring.
Eliminate this.

In this case, when the case 40 is mounted on the lower surface side of the front bottom plate 4b of the cushion frame 3 by the mounting member 50, the case 40 is connected to the left and right intermediate portions of the rear operation connection shaft 25 and the front operation connection shaft 31. The function of the bearing for supporting the shaft can be expected, and the rotation is stable and suitable. In addition, a bulging portion 51 (FIG. 1) is provided substantially at the center of the bottom plate 4b on the front side of the cushion frame 3 of the embodiment so as to protrude upward, and an attachment member 50 (FIG. 2) is provided below the bulging portion 51. The mounting member 50 has its front and rear ends extending forward and backward from the bulging portion 51, and is fixed to the bottom plate 4b.
Is mounted, the bulging portion 51 supports the load of the submarine phenomenon in which the occupant sinks, and the case 40 supports the bulging portion 51 when it is deformed, thereby providing a reliable support configuration. Conversely, in the embodiment in which the attachment member 50 is omitted and the case 40 is attached while the case 40 is inserted through the rear operation connection shaft 25 and the front operation connection shaft 31, the two rear operation connection shafts 25 and Since it is located between the front-side working connection shafts 31, there is no problem. In this case, the mounting process can be simplified, which is preferable.

When the rear motor 34 and the front motor 35 are energized, the front and rear portions of the seat are moved up and down. When the energization is stopped, the rear operation connection shaft 25 and the front operation connection shaft 31 rotate. Lock the cushion seat 2
Is held in place. Thus, the rear operating arm 23
Further, since the regulating member 52 for preventing excessive rotation is provided integrally or separately with the front operating arm 29, mechanical locking of the rear link R and the front link F of the vertical motion device can be prevented. In this case, if the sector gear for manual operation is diverted, the cost can be reduced. The case 40
When the rear-side working connection shaft 25 and the front-side working connection shaft 31 are penetrated therein and the passive gears 32 and 33 are provided in the case 40, each of the passive gears 32 and 33 is shaped like a sector gear like a sector gear. Since the engagement portion 53 is provided by bulging a part of the case 40 inward, the passive gear 3 is formed.
2, 33 abut against the engaging portion 53 to regulate the rotation, and similarly to the regulating member 52, the rear link R and the front link F of the vertical movement device can be prevented from being mechanically locked, and the adjustment range is widened. Also prevent.

[0028]

According to the present invention, there is provided a vertical movement mechanism for independently raising and lowering the front and rear portions of the vehicle seat, and the vertical movement mechanism is configured to be operated by two rear motors and two front motors. In the vertical movement device, the rear link R and the front link F are disposed on the left and right, respectively, and the left and right rear links R and the front link F are connected to the rear operation connecting shaft 2.
5 and a front working connection shaft 31 respectively, and a passive gear 3 is connected to the rear working connection shaft 25 and the front working connection shaft 31.
2 and 33 are fixed respectively, and the output gears 36 and 37 to which the rotations of the rear motor 34 and the front motor 35 are transmitted are respectively meshed with the passive gears 32 and 33 to form a vehicle seat vertical movement device. Since rotation is not transmitted by the link mechanism as in the prior art, it is possible to prevent twisting when rotation is transmitted to the rear-side operation connection shaft 25 and the front-side operation connection shaft 31, and the operation space is also reduced. It can be small and easy to assemble. Further, the rotation can be smoothly transmitted to the left and right rear links R and the front links F, thereby preventing generation of abnormal noise and improving durability. In the present invention, since the passive gears 32 and 33 are vertical moving devices for a vehicle seat fixed to substantially the right and left intermediate portions of the rear working connection shaft 25 and the front working connection shaft 31, respectively. The force (torque) for operating the left and right rear links R and the front link F can be made equal, the torsional load on each of the connecting shafts 25 and 31 can be reduced, and the left and right rear links R and the front side can be reduced. The left and right balance of the load applied by the link F can be improved, and the operation can be performed smoothly and reliably. The present invention is characterized in that the rear working connection shaft 25 and the front working connection shaft 31 are disposed below the front bottom plate 4b of the cushion frame 3 of the vehicle seat at predetermined intervals in front and rear of the vehicle seat. Since it is a moving device, a space with a small seating load can be effectively used. The present invention relates to the rear motor 34.
In addition, the front motor 35 is a vehicle seat vertical movement device disposed at a substantially right and left center position between the rear operation connection shaft 25 and the front operation connection shaft 31. Can be easily arranged.

[Brief description of the drawings]

FIG. 1 is a side view of a cushion sheet.

FIG. 2 is a plan view of a fixed frame and side frames.

FIG. 3 is a cross-sectional plan view of an operation connection shaft and an operation mechanism.

FIG. 4 is an operation state diagram of the vertical movement device (front and rear "low position").

FIG. 5 is an operation state diagram of the vertical movement device (front side “high position”).
Rear "low position")

FIG. 6 is an operation state diagram of the vertical movement device (front side “high position”).
Rear "high position")

FIG. 7 is a sectional view of a case.

FIG. 8 is a sectional view of a second embodiment of the case.

FIG. 9 is a plan view of an operation transmission mechanism of another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Cushion seat, 3 ... Cushion frame, 4 ... Rear bottom plate, 5 ... Standing part, 6 ... Front bottom plate, 7 ... Side frame, 10 ... Vertical plate part, 11 ... Horizontal plate part, 12 ... fixed frame, 16 ... rear-side rotating arm, 17
... Moving side mounting shaft, 18 ... Fixed side mounting shaft, 19 ... Lower end, 2
0: rear window, 21: rod, 22: shaft, 23: rear operation arm, 24: shaft, 25: rear operation connection shaft, 26 ...
Front rotating arm, 27: fixed mounting shaft, 28: front window, 29: front operating arm, 30: arm mounting shaft, 31
... front side working connection shaft, 32, 33 ... passive gear, 34 ... rear motor, 35 ... front motor, 36 ... output gear, 40 ...
Case 41 41 rear output shaft 42 front output shaft 43 motor output shaft gear 44 passive gear 45 intermediate shaft 46
Intermediate gear, 47 ... Intermediate shaft, 48 ... Intermediate gear, 50 ... Mounting member, 51 ... Swelling portion, 52 ... Regulatory member, 53 ... Engagement portion.

[Procedure amendment]

[Submission date] October 20, 1998 (1998.10.
20)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 7

FIG. 5

FIG. 6

FIG. 8

FIG. 9

Claims (4)

[Claims] An up-down movement mechanism for independently raising and lowering a front portion and a rear portion of a vehicle seat, wherein the up-down movement mechanism is configured to be operated by two rear motors 34 and a front motor 35. In the vertical movement device, a rear link R and a front link F are disposed on the left and right, respectively, and the left and right rear links R and the front link F are respectively connected by a rear operation connection shaft 25 and a front operation connection shaft 31. The rear working connection shaft 25 and the front working connection shaft 31 are connected to passive gears 32, 3.
A vehicle seat vertical movement device in which the output gears 36 and 37 to which the rotations of the rear motor 34 and the front motor 35 are transmitted are respectively engaged with the passive gears 32 and 33, respectively. 2. The passive gear according to claim 1,
Reference numeral 33 denotes a vehicle seat up-and-down moving device fixed to substantially the right and left intermediate portions of the rear-side operation connection shaft 25 and the front-side operation connection shaft 31. 3. The rear-side working connection shaft 25 and the front-side working connection shaft 31 according to claim 1 or 2,
Front bottom plate 4b of cushion frame 3 of the vehicle seat
Vertically moving devices for a vehicle seat, which are arranged at predetermined intervals in front and rear below the vehicle. 4. The method according to claim 1, 2 or 3.
, The rear motor 34 and the front motor 35
Is a vertical movement device for a vehicle seat disposed at a substantially left and right center position between the rear operation connection shaft 25 and the front operation connection shaft 31.