JPH0560932U - Seat lifter device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to suppress rattling of each component that supports the seat cushion, improve the operability without burdening the electric motor, and improve the sitting comfort.
To provide a sheet lifter device which is also advantageous in strength. [Structure] While a supporting portion is erected on a gear case disposed on the installation site side, a pin portion is provided on a screw member that is vertically driven to connect and support a seat cushion, and the screw member is arranged on the supporting portion in the vertical direction. A guide groove is formed in which the pin portion is fitted and guided to prevent rattling when driving.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seat lifter device capable of adjusting the vertical position of a seat cushion by an electric motor.

[0002]

[Prior Art]

 A conventional sheet lifter device of this type is, for example, as shown in FIG.

That is, the seat cushion 2 is mounted on the vehicle body floor 1 via the seat lifter device 3 so that the vertical position can be adjusted. The seat lifter device 3 includes shaft members 3a and 3b that are rotatably provided in front of and behind the base member 4, and relay link members 5 and 5 that are pivotally supported at both ends of the shaft members 3a and 3b, respectively. It comprises a mounting bracket 6 rotatably connected to the upper end of each relay link member 5, and rod members 7, 7 connecting the lower ends of the front and rear relay link members 5, 5. The upper end of each mounting bracket 6 is bent inward and fixed to the bottom of the seat cushion 2.

In the seat lifter device 3, when the shaft member 3 a is rotated by an electric motor (not shown), the relay link members 5 are swung, and the mounting brackets 6 are vertically moved, so that the seat cushion 2 The height can be adjusted.

[0005]

[Problems to be solved by the device]

 However, in such a conventional vehicle seat, the shaft members 3a and 3b installed in front of and behind the base member 4 and the relay link members 5, and the front and rear relay link members 5 and 5 and the rod member 7 connecting them, Furthermore, since there are many connecting points between each relay link member 5 and each component such as each mounting bracket 6, the seat cushion 2 supported by these is easily rattled, and the electric motor is burdened with impaired operability. However, there is a problem that the sitting comfort of the seated person may be impaired. Moreover, there is a problem that it is disadvantageous in terms of strength.

The present invention has been made in view of such a conventional problem, and suppresses rattling of each component supporting the seat cushion to improve operability without burdening the electric motor. In addition, it is an object of the present invention to provide a seat lifter device that can improve the sitting comfort and is also advantageous in terms of strength.

[0007]

[Means for Solving the Problems]

 The gist of achieving the object is to provide a seat lifter device (30) capable of adjusting the vertical position of the seat cushion (50) by an electric motor (40, 44). A screw member (36) that vertically supports the four corners of the front and rear sides of the both side portions (51, 51), respectively, and is connected to the screw member (36) so that the screw member (36) can rotate relatively. 40, 44) and a nut member (34) that is driven to rotate, and the screw member (36) and the nut member (34) that are arranged on the side of the installation site (10) below the seat cushion (50). A gear case (32) for supporting the gear case (32), and extending vertically in the gear case (32) beside the screw member (36). While the support portion (33) is erected, a pin portion (37) is provided on the upper end side of the screw member (36) driven in the vertical direction, and the screw member (36) is provided on the support portion (33). ) Is driven up and down, a guide groove (33a) is formed in which the pin portion (37) is fitted and guided in order to prevent rattling, and a seat lifter device (30) is provided. .

[0008]

[Action]

 Since the four corners of the seat cushion (50) are individually supported by screw members (36) that are vertically driven, a shaft extending in the front-rear, left-right direction of the seat cushion (50) as in a conventional lifter device. It is not necessary to arrange members and link members. As a result, the number of connecting points between the respective constituent parts is reduced, so that the rattling of the seat cushion (50) caused by the connecting relationship of a plurality of members such as a link mechanism can be suppressed.

In order to adjust the vertical position of the seat cushion (50) by the seat lifter device (30), the nut member (34) supported by the gear case (32) on the installation site (10) side is moved to the electric motor ( The screw member (36) which is rotationally driven by 40, 44) and which is rotatably engaged with the nut member (34) is vertically driven. As a result, the vertical position of the seat cushion (50) connected and supported by the screw member (36) can be adjusted.

When the screw member (36) is driven in the vertical direction, the screw member (36) is attached to the support portion (33) of the gear case (32) extending in the vertical direction by the pin member (37). ) Supported. That is, the pin portion (37) provided on the upper end side of the screw member (36) fits into the guide groove (33a) formed in the support portion (33) of the gear case (32), With the vertical movement of (36), the pin portion (37) is guided while being fitted in the guide groove (33a).

As a result, rattling during operation is prevented, the electric motor (40, 44) operates smoothly without an excessive load, and the screw member (36) is operated by the nut member (34). Not only is it supported by the support portion (33) of the gear case (32), it is also advantageous in terms of strength.

If a pair of screw members (36, 36) that support the front sides of both sides (51, 51) of the seat cushion (50) are synchronously driven in the vertical direction, the seat cushion (50) The height of the front side can be appropriately adjusted to a desired position.

On the other hand, if the pair of screw members (36, 36) supporting the rear sides (51, 51) of both sides of the seat cushion (50) are synchronously driven in the vertical direction, the seat cushion (50) The height of the rear side can be appropriately adjusted to a desired position. Further, the height of the front side and the rear side of the seat cushion (50) may be adjusted at the same time.

A seat side rail (22) fitted to the vehicle body side rail (21) with respect to the vehicle body side rail (21) of the seat slide device (20) fixed to the installation portion (10). The seat cushion (50) can be adjusted to a desired front-back position by appropriately moving the seat cushion (50) back and forth.

[0015]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. As shown in FIG. 1, a cushion frame 50 to be installed in a seat cushion is supported by a seat lifter device 30 so that the seat frame can be vertically adjusted with respect to the vehicle body floor 10 side, which is an installation site. It is installed on the vehicle body floor 10 via the seat slide device 20 so that the front-rear position can be adjusted.

The seat slide device 20 has a pair of rail units 20 a, 20 a which are arranged below both side portions of a cushion frame (seat cushion) 50 and extend in the front-rear direction. The rail unit 20a includes a vehicle body-side rail 21 that is fixedly installed on the vehicle body floor 10 via leg members 11, and a seat-side rail 22 that movably fits to the vehicle body-side rail 21 and supports a seat. And comprises.

As shown in FIG. 1, the rail 21 on the vehicle body side is formed in a groove-shaped cross section and has a bottom surface portion and both side wall portions 24, 24. Similarly, the seat-side rail 22 is formed in a groove-shaped cross section and has a ceiling portion 25 and side wall portions 26, 26. The opening of the rail 21 on the vehicle body side and the opening of the rail 22 on the seat side are combined to form a bottom portion and both side wall portions 24, 24 of the rail 21 on the vehicle body side, and a ceiling portion 25 and both side wall portions of the rail 22 on the seat side. A space is formed by being surrounded by 26, 26.

A drive unit (not shown) is installed in each of the gaps between the pair of rail units 20a, 20a, and the slide unit fixed to the side wall portion 26 of the rail 22 on one seat side by the drive unit. The electric motor 28 is used as a power source, and the rail 22 on the seat side is fitted to the rail 21 on the vehicle body so as to move back and forth. A flexible wire 29 connected to the output shaft extends from the tip of the sliding electric motor 28 to the side of the rail 22a on the other seat side.

A seat lifter device 30 that supports a seat cushion so that the seat cushion can be vertically adjusted is mounted on a ceiling portion 25 of a rail 22 on the seat side of the seat slide device 20. The seat lifter device 30 has four vertical drive units 31, 31 ... For connecting and supporting the four corners on both sides of the cushion frame 40 so that their heights can be adjusted respectively.

As shown in FIG. 2 and FIG. 4, each vertical drive unit 31 includes a screw member 36 and a screw member 36 that are vertically driven by connecting and supporting four corners on both sides of the cushion frame 40. And a gear case 32 that supports the screw member 36 and the nut member 34, respectively.

The gear case 32 is provided with a supporting portion 33 standing upright in the vertical direction beside the screw member 36. A guide groove 33a, into which a pin member (pin portion) 37 pivotally supported by the upper end portion 36a of the screw member 36 is fitted and guided, is formed in the support portion 33 in order to prevent the screw member 36 from rattling. It is set up.

As shown in FIG. 1, the gear case 32 is bolted to the front and rear ends of the ceiling portion 25 of the seat-side rail 22. Insertion holes 25a are formed at the front and rear ends of the seat-side rail 22 to which the vertical drive unit 31 is fixed, and the lower end side of the screw member 36 supported by the gear case 32 extends from the insertion hole 25a to the rail unit. It is inserted in the void of the belt 20a.

A stopper member 36 b for preventing the screw member 36 from coming off from the nut member 34 is fixed to the lower end of the screw member 36 that is inserted into the space of the rail unit 20 a. On the other hand, the upper end side of the screw member 36 extending upward extends above the rail unit 220a through the insertion hole 25a and is connected to the four corners on both sides of the cushion frame 40.

More specifically, as shown in FIGS. 2 to 4, the upper end portion 36 a of the screw member 36 supported on the front end side of the seat-side rail 22 is fitted into the guide groove 33 a of the support portion 33. One end side of a link bracket 38 having a substantially U-shaped cross section is pivotally attached via a pin member 37 guided by the above. A clasp 37a is fitted on the tip side of the pin member 37. The other end of the link bracket 38 is pivotally supported by a first link member 57 which engages with both ends of a front frame member 53 constituting the cushion frame 50 via a stepped bolt 57a and a nut 57b.

A front drive motor 40 is fixed to the outer wall of the gear case 32 of the vertical drive unit 31 attached to the front end of the rail 22 on one seat side. One output shaft (not shown) extending to the base end side of the front drive motor 40 is directly and rotatably connected to an input shaft of a worm that extends laterally of the gear case 32. A flexible wire 29 connected to the output shaft of the motor is extended from the front end side of the front drive motor 40 to the vertical drive unit 31 at the front end of the rail 22 on the other seat side.

As shown in FIG. 1, at the upper end portion 36 a of the screw member 36 attached to the rear end of the seat-side rail 22, a pin member that is fitted and guided in the guide groove 33 a of the support portion 33. One end of a second link member 58 having a substantially U-shaped cross section is pivotally mounted via 37, and the tip end of the pin member 37 is pivotally supported by the rear portion of the side frame member 51 of the cushion frame 50. The other end of the second link member 58 is engaged with the end of the rear frame member 55.

An input shaft 35a of the worm 35 extends from the front surface of the gear case 32 of the vertical drive unit 31 mounted on the rear end of the seat-side rail 22, and each input shaft 35a has a rear shaft. Flexible wires 46, 46 respectively connected to output shafts 46, 46 at both ends of the drive motor 44 are integrally and rotatably connected. The rear drive motor 44 is fixed to the bottom surface of the seat cushion.

As shown in FIG. 1, the cushion frame 50 to be inserted into the seat cushion includes side frame members 51, 51 on both sides, a front frame member 53 and a cover frame member that are installed at the front ends of the side frame members 51. 54 and a rear frame member 55 installed at the rear end of each side frame member 51.

Further, a plurality of hooks 54a, 54a ... For hooking the S spring members 56, 56 ... Are continuously provided on the upper surface side of the cover frame member 54 so as to extend in the longitudinal direction. A plurality of hooks 55a, 55a ... For hooking the S spring members 48, 48 ... Are connected to the rear frame member 55 so as to extend in the longitudinal direction thereof. An attachment wire 52 for hooking the trim cover is fixed to the upper edge of the front portion of the side frame member 51.

Next, the operation will be described. The seat cushion, that is, the four corners of the cushion frame 50 are supported by the screw members 36 that are separately driven in the vertical direction, so that a shaft member or a link extending in the front, rear, left, and right of the seat cushion that constitutes the conventional lifter device. There is no need to arrange members. As a result, the number of connecting points between the respective constituent parts is reduced, so that the rattling of the seat cushion, which is caused by the connecting relationship between a plurality of members such as the link mechanism, can be suppressed.

When adjusting the front portion of the seat cushion, that is, the height position of the front frame member 53 of the cushion frame 50 by the seat lifter device 30, the front drive motor 40 is started in FIGS. 1 and 4. The rotation torque of the front drive motor 40 is transmitted to the input shaft 35a of the worm 35 of the vertical drive unit 31 mounted on the front end side of the seat side rail 22 directly or via the flexible wire 43, and as shown in FIG. The nut member 34 fitted with the worm 35 in the gear case 32 is rotationally driven.

When the nut member 34 is rotationally driven, the screw member 36 that is rotatably engaged with the nut member 34 is gradually fed in the vertical direction. As a result, the front frame member 53 connected and supported by the screw member 36 moves in the vertical direction with respect to the seat-side rail 22, and the height of the front portion of the seat cushion relative to the vehicle body floor 10 is appropriately adjusted to a desired position. Can be adjusted.

When the screw member 36 is driven in the vertical direction, the screw member 36 is supported by the support portion 33 of the gear case 32 extending in the vertical direction by the pin member 37. That is, the pin member 37 pivotally supported by the upper end portion 36a of the screw member 36 is fitted into the guide groove 33a formed in the support portion 33, and the pin member 37 is moved by the vertical movement of the screw member 36. It is guided while it is still fitted to 33a.

As a result, rattling during operation is prevented, and the front drive motor 40 operates smoothly without excessive load. Further, since the screw member 36 is supported not only by the nut member 34 but also by the supporting portion 33 of the gear case 32, it becomes advantageous in strength.

The rear portion of the seat cushion, that is, the height position of the rear frame member 55 can be adjusted in the same manner as the front portion of the seat cushion. That is, the rear drive motor 44 is rotationally driven in a predetermined direction. The rotation torque of the output shaft 46 of the rear drive motor 44 is transmitted via the flexible wire 46 to the input shaft 35a of the worm 35 of each vertical drive unit 31 on both sides of the rear portion.

As a result, as described above, the nut member 34 is rotationally driven, and the screw member 36 that is rotatably engaged with the nut member 34 is gradually fed in the vertical direction and is supported by the screw member 36. Further, the rear end of the side frame member 51 moves vertically with respect to the seat-side rail 22, and the height of the rear portion of the seat cushion with respect to the vehicle body floor 10 can be appropriately adjusted to a desired position.

The tip portion 37 of the screw member 36 of each vertical drive unit 31 is provided with a first or second link member 57, 58 or a link bracket 38 that absorbs a vertical movement difference between the front and rear of the cushion frame 50. Since the cushion frame 50 is supported, the vertical position of the seat cushion can be adjusted smoothly without causing a malfunction. Further, by simultaneously driving the front drive motor 40 and the rear drive motor 44 of the seat lifter device 30 in the same direction, it is possible to simultaneously adjust the heights of the front portion and the rear portion of the seat cushion.

Further, when adjusting the front-back position of the seat cushion retained by the cushion frame 40, the vehicle body side rail 21 of the seat slide device 20 fixedly mounted on the vehicle body floor 10 is fixed to the vehicle body side. The seat-side rail 22 fitted to the rail 21 is moved back and forth as appropriate. Thereby, the seat cushion can be adjusted to a desired front-back position.

In the above embodiment, when the screw member is driven in the vertical direction, in order to prevent the rattling, the pin portion fitted and guided in the guide groove of the support portion provided upright on the gear case is The pin portion is a separate member pivotally supported on the upper end portion of the screw member, but the pin portion may be integrally provided on the upper end side of the screw member.

[0040]

[Effect of the device]

 According to the seat lifter device of the present invention, the supporting portion is erected on the gear case disposed on the installation site side, and the pin portion is provided on the screw member that is vertically driven to connect and support the seat cushion. When the screw member is driven in the vertical direction, a guide groove for fitting and guiding the pin portion is formed in order to prevent rattling, so that the screw member that supports the seat cushion in an adjustable height, etc. It is possible to suppress rattling of each component, improve the operability without imposing a burden on the electric motor, improve the sitting comfort, and further improve the strength.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a seat lifter device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a vertical drive unit of a seat lifter device according to an embodiment of the present invention.

FIG. 3 is a front view showing a vertical drive unit of a seat lifter device according to an embodiment of the present invention.

FIG. 4 is a sectional view of an essential part showing a vertical drive unit of a seat lifter device according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional seat lifter device.

[Explanation of symbols]

 10 ... Body floor (installation site) 20 ... Seat slide device 21 ... Vehicle side rail 22 ... Seat side rail 30 ... Seat lifter device 31 ... Vertical drive unit 32 ... Gear case 33 ... Support part 33a ... Guide groove 34 ... Nut member 36 ... Screw member 37 ... Pin member (pin portion) 40 ... Cushion frame (seat cushion)

Claims (1)

[Scope of utility model registration request] 1. A seat lifter device capable of adjusting the vertical position of a seat cushion by an electric motor, wherein a screw member that vertically supports four corners of both sides of the seat cushion and that is driven in the vertical direction, and the screw. A nut member that is rotatably screwed relative to a member and is rotationally driven by the electric motor; and a gear case that is disposed below the seat cushion and that supports the screw member and the nut member. Then, in the gear case, a support portion extending vertically is provided beside the screw member, while a pin portion is provided on an upper end side of the screw member driven in the vertical direction, and the support portion includes the screw. When the member is driven vertically,
A seat lifter device characterized in that a guide groove is formed in which the pin portion is fitted and guided to prevent backlash.