JP3851942B2 - Power type slide seat device - Google Patents

Description

[0001]
【Technical field】
The present invention relates to a power type slide seat device used for a passenger car seat.
[0002]
[Prior art and its problems]
As one of the power-type slide seat devices, a drive screw that is driven to rotate forward and backward by a motor in parallel with the lower rail is arranged in a lower rail fixed to the vehicle floor, and is slidable on the lower rail. There is known a type in which a nut body that is engaged with the drive screw is fixed to an upper rail that is engaged and fixed to a seat. In principle, the drive screw may be supported on the upper rail and the nut body may be supported on the lower rail. JP-A-6-1170 is an example of this type of slide sheet.
[0003]
In this prior example, an upper rail having a box-shaped cross section and a width smaller than that of the lower rail is slidably fitted to a relatively flat box-shaped lower rail. The drive screw is located substantially in the center of the box-shaped upper rail, and the nut body fixed to the lower rail extends into the upper rail and is screwed with the drive screw. The sliding guides between the lower rail and the upper rail are provided so as to protrude downward and to the left and right of the drive screw and the nut body, and a rolling roller is disposed between the substantially horizontal load receiving surfaces provided on the upper rail and the lower rail, respectively. It is installed.
[0004]
In this conventional power-type slide seat device, the upper rail has a box-shaped cross section that houses the drive screw, and the lower rail that receives the upper rail also has a flat box-shaped cross section that is wider than the upper rail. Furthermore, since the roller which receives a sheet | seat load is arrange | positioned at the lower left and right of a drive screw, the lateral width of a rail cross section is large as a whole. For this reason, the foot seating ability of the rear seat occupant is poor (the space for extending the legs is narrow). Also, it looks bad for the same reason. Furthermore, since the seat load is received on a horizontal plane, backlash in the left-right direction is likely to occur.
[0005]
OBJECT OF THE INVENTION
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to obtain a power type slide seat device that can be narrowed as a whole and has excellent foot seating ability.
It is another object of the present invention to provide a power type slide seat device that is easy to receive and distribute seat load and hardly generates backlash.
[0006]
Summary of the Invention
Features of the power seat slide of the present invention, the sectional shape of the lower rail and the upper rail, a positional relationship between the drive screw.
That is, the present invention is a lower rail fixed to a vehicle floor, an upper rail fixed to a seat, slidably engaged with the lower rail, and extending in parallel with the lower rail and the upper rail, and driven to rotate forward and backward by a motor. In the power type slide seat device, the drive screw and the nut body screwed to the drive screw, one of the drive screw and the nut body is supported by the lower rail, and the other is supported by the upper rail. The lower rail has a substantially box-shaped cross section, and has an upper rail passage gap at the center of the upper wall, and has an upper rail load receiving portion at the middle in the vertical direction of the left and right vertical walls. A vertical wall extending substantially vertically through the passage gap of the lower rail, and widened from the lower end of the vertical wall to the left and right Has a substantially inverted T-shaped cross-section comprising a load transmitting portion for transmitting the load to the load receiving portion of the lower rail, further the upper rail has a substantially symmetrical cross-sectional shape having a blade portion extending horizontally from the lower end of the vertical wall The left and right wings are respectively formed at a first inclined part facing the upper surface of the load receiving part of the lower rail, substantially perpendicular to the first inclined part, and above the first inclined part. A plurality of balls each having a substantially right-angle cross-sectional portion having a second inclined portion and between the first inclined portion of the upper rail and the upper surface of the load receiving portion of the lower rail and between the second inclined portion and the lower rail. Alternatively, a roller is inserted, and the drive screw and the nut body are located below the upper rail in the lower rail having a substantially box-shaped cross section.
[0007]
A plurality of balls or rollers can be held by the ball retainer.
[0008]
The nut body is fixed to the lower rail, and the drive screw is supported by the upper rail so as to be rotatable and does not move in the axial direction, and is driven to rotate forward and backward by the motor through a gear fixed to the front end portion thereof. It is preferable.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The lower rail 20 is fixed to the floor 11 (FIG. 4) of the front seat of the passenger car via fixed legs 21 formed at the front and rear end portions thereof, and the lower surface of the seat 12 is slidably fitted to the lower rail 20. The upper rail 30 is fixed.
[0010]
As is clear from FIGS. 1 and 3, the lower rail 20 has a symmetrical box-shaped cross section having a bottom wall 22, left and right vertical walls 23, and an upper wall 24. An upper rail passage gap 25 is formed. On the left and right vertical walls 23, a load receiving portion (inward recessed portion) 26 having a V-shaped or U-shaped cross section recessed inward is formed at a substantially central portion in the vertical direction. The upper surface of 26 constitutes a load receiving surface 27. The load receiving surface 27 is inclined with respect to the vertical direction, and is approximately 45 ° with respect to the vertical direction in the figure. The load receiving portion 26 is integrally formed with the left and right vertical walls 23 being recessed, but the left and right vertical walls 23 are not recessed, and a bar-shaped member having a V-shaped or U-shaped cross section is welded to the left and right. It may be fixed to the vertical wall 23.
[0011]
The upper rail 30 whose upper end is fixed to the seat 12 has a substantially inverted T-shaped cross section at its lower end. That is, it has a vertical wall 31 that enters the lower rail 20 from the passage gap 25 of the lower rail 20, and a load transmission portion (wing portion) 32 that extends left and right from the lower end portion of the vertical wall 31. The load transmitting portion (wing portion) 32 includes a load transmitting surface (first inclined portion) 33 that is substantially parallel to the load receiving surface 27 formed on the lower rail 20 by the load receiving portion 26, and the load transmitting surface (first (Inclined part) 33 and a second inclined part 34 having a substantially right angle. The second inclined portion 34 and the left and right vertical walls 23 of the lower rail 20 form approximately 45 °.
[0012]
A plurality of balls 41 and 42 held by a ball retainer 40 are inserted between the left and right vertical walls 23 above the load receiving portion 26 of the lower rail 20 and the load transmitting portion (wing portion) 32 of the upper rail 30. . That is, the ball 41 is positioned between the load transmission surface (first inclined portion) 33 of the upper rail 30 and the load receiving surface 27 of the lower rail 20, and the ball 42 is interposed between the second inclined portion 34 and the left and right vertical walls 23. positioned. The ball 41 plays a role of transmitting the load of the seat 12 from the load transmission surface (first inclined portion) 33 to the load receiving surface 27, and the ball 42 mainly plays a role of sliding the lower rail 20 and the upper rail 30 smoothly. Take on. The balls 42 are preferably provided for smooth sliding, but may be omitted in the sense of supporting the seat load.
[0013]
A drive screw (ball screw) 50 is supported on the upper rail 30 so as not to move in the axial direction between the front and rear bearing plates 35 (FIGS. 3 and 4). The drive screw 50 is located in the lower rail 20 and is located below the center of the left and right load receiving surfaces 27 (the left and right load transmitting portions 32 of the upper rail 30). Alternatively, it is located in the middle of the left and right load receiving portions 26 of the lower rail 20. As shown in FIGS. 3 and 4, a worm wheel 51 is fixed to the front end portion of the drive screw 50, and a worm 53 that is rotationally driven by a forward / reverse rotation motor 52 meshes with the worm wheel 51. . The forward / reverse rotation motor 52 is driven to rotate forward and backward via a forward / reverse switch 54 and a control circuit 55.
[0014]
A nut body 56 that is screwed to the drive screw 50 is fixed to the lower rail 20 via a fixing bolt 57 (FIGS. 3 and 4).
[0015]
In the power seat slide device having the above-described configuration, when the forward / reverse rotation motor 52 is driven forward / reversely via the forward / backward movement switch 54 and the control circuit 55, the drive screw 50 is rotated forward / reversely via the worm 53 and the worm wheel 51. Driven by rotation. Since the drive screw 50 is screwed into the nut body 56 fixed to the lower rail 20, the drive screw 50 itself, that is, the upper rail 30 (the seat 12) that supports the drive screw 50 so as not to move in the axial direction. Moves back and forth. During this back-and-forth movement, the ball 41 held by the ball retainer 40 and positioned between the load transmission surface (first inclined portion) 33 of the upper rail 30 and the load receiving surface 27 of the lower rail 20 receives the load of the seat 12. Rolling while transmitting to the load receiving surface 27, the ball 42 located between the second inclined portion 34 of the upper rail 30 and the left and right vertical walls 23 of the lower rail 20 rolls to help smooth movement.
[0016]
The advantages of this embodiment are as follows.
1. Since the lower rail 20 has a cross-sectional box shape and a substantially inverted T-shaped cross-section at the lower end of the upper rail 30 is inserted into the upper portion thereof, the width in the left-right direction can be reduced.
2. The load of the seat 12 is mainly transmitted from the load transmitting surface (first inclined portion) 33 of the load transmitting portion (wing portion) 32 of the upper rail 30 to the load receiving surface 27 of the lower rail 20, and the load transmitting surface 33 and the load receiving surface. Since 27 is inclined at an angle of approximately 45 ° with respect to the vertical and horizontal directions, backlash in the left-right direction is unlikely to occur in the upper rail 30. For the same reason, even if there is a manufacturing error, backlash hardly occurs and uneven wear hardly occurs. Obviously, the inclination angle of the load transmitting surface (first inclined portion) 33 and the load receiving surface 27 may be an appropriate angle other than approximately 45 °.
3. Dust accumulates in the lower rail 20 (particularly the upper surface of the bottom wall 22) due to long-term use, and this dust may hinder smooth sliding of the upper rail 30, but the balls 41 and 42 are loaded on the lower rail 20. Since it is located in the upper part of the receiving part 26, it is hard to receive the influence of dust.
[0017]
The retainer 40 holding the balls 41 and 42 is to insert an appropriate number of 1 or more into the left and right gaps between the upper rail 30 and the lower rail 20. Further, the lower rail 20 is provided with an appropriate stopper for restricting the front and rear moving ends of the retainer 40 to prevent the retainer 40 from falling off.
[0018]
The balls 41 and 42 in the above embodiments can be replaced with rollers. Further, a load transmission member other than the roller may be used. Furthermore, the second inclined portion (load transmission surface) 34 of the upper rail 30 may be directly slid with the load receiving surface 27 of the lower rail 20 by performing an appropriate low friction treatment.
[0019]
【The invention's effect】
The power seat slide device of the present invention can be reduced in width as a whole, and can improve the foot seating ability of the rear seat occupant. In addition, the seat load is received in a distributed manner, and rattling is unlikely to occur.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a power seat slide according to the present invention.
FIG. 2 is a perspective view showing a shape example of a single ball retainer used in the apparatus.
FIG. 3 is an exploded perspective view of the apparatus.
FIG. 4 is a side view of the apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Vehicle floor surface 12 Seat 20 Lower rail 21 Fixed leg 22 Bottom wall 23 Left and right vertical wall 24 Upper wall 25 Passing clearance 26 Load receiving part 27 Load receiving surface 30 Upper rail 31 Vertical wall 32 Load transmission part (wing part)
33 Load transmission surface (first inclined part)
34 Second inclined portion 40 Ball retainer 41 42 Ball 50 Drive screw (ball screw)
51 Worm wheel 52 Forward / reverse rotation motor 53 Worm 54 Forward / backward movement switch 55 Control circuit 56 Nut body

Claims (3)

A lower rail fixed to the vehicle floor;
An upper rail slidably engaged with the lower rail and fixed to the seat;
A drive screw that extends parallel to the lower rail and the upper rail and is driven to rotate forward and backward by a motor;
A nut body screwed onto the drive screw;
A power slide seat device in which one of the drive screw and the nut body is supported by the lower rail and the other is supported by the upper rail.
The lower rail has a substantially box-shaped cross section, has an upper rail passage gap at the center of the upper wall thereof, and has load receiving portions of the upper rail at intermediate portions in the vertical direction of the left and right vertical walls;
The upper rail has a substantially inverted T comprising a vertical wall extending substantially vertically through the passage gap of the lower rail, and a load transmitting portion that extends from the lower end portion of the vertical wall to the left and right and transmits a load to the load receiving portion of the lower rail. Having a cross-section;
The upper rail has a substantially bilaterally symmetric cross-sectional shape having wings that extend from the lower end of the vertical wall to the left and right, and the first and second wings are opposed to the upper surface of the load receiving portion of the lower rail, respectively. parts and, the first inclined portion and substantially perpendicular, to have a substantially right-angled cross section and a second inclined portion formed above the first inclined portion;
A plurality of balls or rollers are inserted between the first inclined portion of the upper rail and the upper surface of the load receiving portion of the lower rail and between the second inclined portion and the lower rail; and the drive screw and nut The body is located below the upper rail in a lower rail having a substantially box-shaped cross section. 2. The power slide sheet apparatus according to claim 1 , wherein a plurality of balls or rollers are held by a ball retainer. 3. The power type slide seat device according to claim 1, wherein the nut body is fixed to the lower rail, and the drive screw is supported by the upper rail so as to be rotatable and does not move in the axial direction, and is fixed to the front end portion thereof. A power-type slide seat device that is rotated forward and backward by the motor through a gear.

Images