JPH0611227Y2 - Power unit for seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a power unit for a seat such as a vehicle seat slide or a seat lifter.

[Prior Art] Generally, a seat in a vehicle such as an automobile, especially a driver's seat of a passenger car has a seat slider that can move in the front-rear direction and a seat in a vertical direction so as to ensure an optimal driving posture of an occupant. A seat lifter that can move up and down is constructed. The operation of such a seat slider or seat lifter is usually a manual operation type, but with the advancement of vehicles, many electric operation types using a motor unit are provided. Many seats are power seats with multiple motor units attached.

A power seat generally has a pair of left and right guide rails fixed to a vehicle body, a seat slider that can slide in the front-rear direction along the guide rails, and links on the front and rear left and right sides of the seat slider. A seat lifter is connected so as to be able to move up and down, and a screw shaft that is screwed into the seat slider is rotatably fixed to a vehicle body side by a motor unit in order to slide the seat slider along a guide rail. In order to move the seat lifter in the vertical direction, the screw shaft is screwed into the nut fixed to the seat lifter, and the screw shaft is rotatably driven by another motor unit fixed to the seat slider to rotate the link. The seat lifter can be moved up and down by moving the motor unit. I had arranged to fit in the seat bottom surface, respectively (e.g., JP-B-37-11355, JP-see JP 55-59026).

[Problems to be Solved by the Invention] However, it is desirable that the above-mentioned conventional power seat has a structure as compact as possible in view of vehicle design, and as described above, a plurality of motor units are attached to the seat. As a matter of fact, since the motor unit is arbitrarily arranged on the lower surface of the seat as described above, there is a limit to making the height of the seat compact, and if there is equipment such as a motor unit on the lower surface of the seat, it is a so-called hip. This is an obstacle to lowering the position of points.

Therefore, as shown in FIG. 6, a pair of power units 15 and 15 required for the front and rear independent seat lifter 14 are provided.
May be integrated by a bracket 16, and bracket portions 17, 17 may be provided and attached and fixed to the side portion of the seat lifter 14. In the power units 15 and 15, gearboxes 19 and 19 to which the drive shafts 18 and 18 of the front and rear parts are fitted are opposed to each other so that the front and rear parts of the seat lifter 14 can be independently lifted and lowered. It is made compact by combining them in a point-symmetrical arrangement so that they face each other in parallel, but since the dimension in the height direction h becomes high, such a combination still cannot support low hip points. . Further, the gear boxes 19 and 19 are usually molded products, but they are two-body products as shown in the figure, and because of the contradictory differences, two molding dies are required and the cost is high. is there.

Therefore, the present invention has been made for the purpose of making the power unit in the power seat as compact as possible, that is, reducing the height dimension thereof.

[Means for Solving the Problems] In order to solve the above problems, the present invention is such that a pair of motors are separated from each other by the same axis and are sandwiched so as to face each other, and the respective output shafts of the motors are inserted. A gear box having holes formed on the same axis is provided, and in the gear box, worm wheels that engage with the output shafts and are rotatable, and a first worm wheel that is rotatable in association with the worm wheels, respectively. And a second screw gear that is rotatable by meshing with each of the first screw gears so as to be orthogonal to the first screw gear, and a pair of screw shafts are provided on the second screw gears. A power unit for a seat, which is separated from the same axis and is rotatably attached to be opposed to each other and is arranged in parallel with the motor, is configured.

[Operation] According to the present invention having the above configuration, the motor and the screw shaft are arranged in parallel with each other with the same axis centering on the gear box, the gear box becomes one, and Since the height of the power unit can be reduced, it can be made compact.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are a plan view, a front view and a side view. In the drawings, 1 is a gear box, 2 and 2 are motors capable of forward and reverse rotation start, and 3 and 3 are screw parts formed on the outer peripheral surface. Screw shafts 4 and 4 are nut blocks having screw holes respectively screwed into the screw shafts 3 and 3, and rotatably support levers 5 and 5, and 6 is a gear box 1 and a motor 2 , 2 is a bracket for mounting and fixing the power unit on the seat lifter or the seat slider. The levers 5 and 5 are connected to the front and rear links on either the left or right side of the seat lifter, and the links are raised and lowered to raise and lower the seat lifter.

As shown in FIG. 4, the gear box 1 is provided with holes 8 for inserting the output shafts 7, 7 of the motors 2, 2 arranged on the same axis so as to face each other on the same axis. Output shaft 7,
7 rotatably supports shafts 10 and 10 respectively rotatably supporting worm wheels 9 and 9, respectively, and screw shafts 11 and 11 are provided with screw gears 11 and 11 as first screw gears, respectively. The worm wheel 9, 9 and the screw gear 11, 11 are integrally rotatably supported on the shaft. Then, in the gear box 1, as shown in FIG. 5, a screw gear screw gear 1 as a second screw gear that meshes with the screw gears 11 and 11 at right angles to each other.
Store 2 and 12 rotatably. Screw shafts 3 are respectively attached to the screw gears 12 and 12 to be integrally rotatable. The screw shafts 3, 3 are spaced apart from each other and are supported by bearings 13 so as to face each other on the same axis, and are arranged in parallel with the motors 2, 2. The bearings 13 are fixed to the side surfaces of the bracket 6. The gear box 1 has a bilaterally symmetrical structure about the center portion thereof, and the height dimension thereof is accommodated within the height range of the motors 2 and 2 or slightly higher (see FIG. 2), such as aluminum die casting. It is made of a mold and has a shape in which a portion for housing the worm wheel 9, the screw gear 11 and its shaft 10 and a portion for housing the screw gear 12 are orthogonal to each other.

Therefore, according to the above configuration, when the motors 2 and 2 are started and the output shafts 7 and 7 respectively rotate, the worm wheels 9 and 9 respectively rotate, the screw gears 11 and 11 integrally rotate, and the screw gear 12 is rotated. The screw shafts 3, 3 respectively rotate through the nut shafts 4, 3 and the nut blocks 4, 4 move along the screw shafts 3, 3 to rotate the lever and tilt the link to raise and lower the seat lifter. The motors 2 and 2 can be started independently, so that the front and rear portions of the seat lifter can be appropriately moved up and down.

[Effects of the Invention] According to the invention described above, a pair of motors are separated from each other by the same axis and are sandwiched so as to face each other, and holes for inserting the respective output shafts of the motors are formed by the same axis. A gearbox is provided, and in the gearbox, worm wheels that engage with the output shafts and are rotatable, and first screw gears that are rotatable in association with the worm wheels, and A second screw gear, which is rotatably engaged with each of the first screw gears so as to be orthogonal to each other, is provided, and a pair of screw shafts are separated from each other in the second screw gear by the same axis. The two motors and their drive systems are housed in one gearbox because they are rotatably mounted opposite each other and rotatably mounted in parallel with the motor. The height is also within the height range of the motor, and since the two screw shafts are arranged in parallel with the motor, the height of the power unit as a whole can be reduced and the overall size becomes compact. Therefore, even if the power unit is attached to the seat lifter or the seat slider, the power unit does not project to the lower surface of the seat, and the dimension in the height direction can be reduced, so that the hip point can be lowered. Also, because the gear box is configured symmetrically with respect to the center, the gear box manufactured with one mold can be attached to either the left or right side of the seat lifter, so the unit price of the gear box can be reduced. As a result, the cost of the power unit can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is a side view, FIG.
The figure is a cross-sectional side view of a main part, and FIG. 6 is a perspective view of a conventional example. 1 ... Gear box, 2 ... Motor, 3 ... Screw shaft, 7 ... Output shaft, 9 ... Worm wheel, 10 ...
... shaft, 11 ... first screw gear, 12 ... second screw gear

Claims (1)

[Scope of utility model registration request] 1. A gear box in which a pair of motors are separated from each other by the same axis and are sandwiched so as to oppose each other, and holes for inserting respective output shafts of the motors are provided in the same axis. Inside the box, the worm wheel rotatable by engaging with the output shafts respectively, the first screw gear rotatable by interlocking with the worm wheels, and the first screw gears respectively. A second screw gear, which is rotatably engaged with each other so as to be orthogonal to each other, is provided, and a pair of screw shafts are spaced from each other on the same axis line and rotatably mounted so as to face each other. And a power unit for a seat, which is arranged parallel to the motor.