JPH0649472Y2 - Seat lifter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a seat lifter for vehicles such as automobiles.

[Prior Art] Generally, a front seat device in a vehicle such as an automobile has a reclining mechanism in which a seat back can rotate in the front-rear direction and a seat cushion in a front-rear direction in order to ensure safe driving of passengers. Seat slide mechanism that can be moved to
It is equipped with a seat lifter mechanism that allows the seat cushion to move up and down. The reclining mechanism includes a hinge that rotatably connects the seat back and the seat cushion with a mechanism that adjusts a tilt angle of the seat back. In the seat slide mechanism, an upper rail is slidably engaged in a longitudinal direction with a lower rail fixed to a floor surface of a vehicle body, and a seat lifter mechanism is mounted on the upper rail or a seat cushion is fixed. It is a thing. Further, the seat lifter mechanism fixes side brackets to the front, rear, left and right sides of the seat cushion, respectively, and also fixes the leg brackets to the upper rails corresponding to the side brackets, and connects the brackets with a link, And,
It comprises a power unit for rotating those links by an electric motor.

[Problems to be Solved by the Invention] However, according to the conventional seat lifter, as shown in FIG. 7, the power unit 45 including the electric motor 42, the screw bolt 43, and the gear case 44 is mounted on the fixed-side frame 46. When fixing, a U-shaped metal cover bracket 47 is attached to the frame 46, and the gear case 44 is fixed to the cover bracket 47 with bolts 48. This is because the gear inside the gear case 44 and the case itself are made of resin in order to reduce the weight and noise of the power unit 45, so when the occupant sits on the seat cushion and a load is input, the strength is increased. This is to solve the above problem. However, although the gear and the case are made of resin to reduce the weight, there is a drawback that the weight reduction is not sufficient as long as the metal cover bracket 47 is used.

Further, in the arrangement configuration of the power unit, since the idle space under the seat cushion is used, there is a drawback that it is not possible to cope with the recent low hip point.

Then, this invention was made for the purpose of solving the said fault.

[Means for Solving the Problems] In order to solve the above problems, this invention connects a leg bracket mounted on a vehicle body or a seat slide device and a side bracket for fixing a seat cushion with a link to form a side bracket. In a seat lifter consisting of a substantially quadrangular frame body that connects a pair of left and right units that enable lifting and lowering with an interlocking rod, and a power unit that rotates the interlocking rod, front and rear of each of the leg brackets of one unit. Power units that rotate the links independently are arranged in a straight line opposite to each other, and
The screw bolts for converting the rotational force of the power unit into linear motion are arranged in a straight line so as to face each other, and nut blocks are respectively screwed into the screw bolts, the nut blocks are connected to the links, and the occupant seats them. When seated on the cushion, a seat lifter is constructed so that forces that face each other act on both screw bolts, and between the leg brackets mounted on the vehicle body or seat slide device and the side brackets that secure the seat cushion. , A seat lifter consisting of a substantially quadrangular frame body having a power unit for connecting a pair of left and right units that can be raised and lowered by connecting links to each other with an interlocking rod, and for rotating the interlocking rod. Front and rear links individually on the leg bracket of the unit The power units to be rotated by are arranged in a straight line so as to face each other, and the screw bolts for converting the rotational force of the power unit into a linear movement are arranged in a straight line so as to face each other, and nut blocks are respectively attached to the screw bolts. Screw together, connect the nut block to the link, and
A seat lifter is constructed by supporting a bush by interposing a washer on one surface of a gear for rotating the screw bolt and supporting the bush on a gear housing.

[Operation] According to the present invention having the above configuration, the front and rear links are provided with independent power units, respectively.
If they are driven simultaneously, the screw bolts rotate in opposite directions to rotate the link via the nut block, and the side brackets of the left and right units move up and down via the interlocking rod to raise the seat cushion height. Can be adjusted. By driving either one of the power units, the seat surface can be adjusted by raising or lowering only the front or rear of the seat cushion. Then, when a load is applied to the side brackets, the front and rear links rotate,
Since the screw bolts respectively engaged with the front and rear power units are acted on by forces facing each other, a compressive force acts on the gear housing that rotatably supports the screw bolts, and the rigidity is sufficient to withstand the compressive force. Since it is good, it can be made lighter without the need for cover brackets, etc. Also, because the gear that rotates the screw bolt is brought into contact with the bush with a washer, and the bush is supported by the gear case, the durability of the gear is improved. Is improved.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. First
Figure is a plan view of the seat lifter, Figure 2 is a left side view of the seat lifter,
FIG. 3 is a right side view. In the figure, OTR is the outer side unit, INR, which is the door side when installed in the vehicle
Indicates an inner unit on the indoor side, arrow F indicates the front of the seat, and arrow R indicates the rear of the seat. Further, 1 is a leg bracket for mounting on a vehicle body or an upper rail (not shown) of a seat slide device, and 2 is a side bracket for supporting a seat cushion frame or a seat pan (not shown). In the embodiment, the upper bracket is used. Although the rail and the leg bracket 1 are set as separate bodies, they may be integrally formed, and the side bracket 2 is integrally formed from the front side to the rear side of the seat, but is divided into the front side and the rear side of the seat. You may set it to two. 4 is a link that rotatably connects between the rear portions of the leg bracket 1 and the side bracket 2 with shafts 14 and 15, and 5 and 6 are leg brackets 1.
Link between the front part of the side bracket 2 and the front part of the side bracket 2. The link 5 is connected to the side bracket 2 by the shaft pin 12.
13 and the link 6 is rotatably supported on the leg bracket 1 by a shaft 11. 7 is the front link 6,
6 is an interlocking rod that connects between 6 and 8, an interlocking rod that connects between the rear links 4 and 4, and 9 and 9a are a power unit 16 and a lever 17 so that the front and rear links 6 and 4 can be independently rotated. It is a drive lever for connecting via. The drive lever 9 has a substantially L or V shape. And the interlocking rod
7 and 8 each consist of a pipe, the drive levers 9 and 9a are connected to both ends of the pipe by welding or the like at the same angle, and the shaft pins 11 and 14 of the links 4 and 6 are inserted into the pipes, respectively, and Connect the other end of the drive levers 9 and 9a to the links 4 and 6, respectively.
The shaft pins 12 and 15 are rotatably supported, and are stopped by push nuts 18. A nut block 19 is connected to each of the levers 17 and 17 with a bolt 20 and a nut 21. As shown in FIG. 6, this nut block 19 has a through hole 22 and a screw hole 23 which are orthogonal to a convex block made of resin, and a collar 24 is formed in the through hole 22.
Is inserted, and the bolt 20 can be inserted into the collar 24. Then, the screw bolt 25 is provided in the screw hole 23.
Is screwed in, and one end of the screw bolt 25 is rotatably supported by a bearing 26 fixed to the leg bracket 1. The other end of the screw bolt 25 is inserted into the gear housing 27 fixed to the leg bracket 1, and the bearing 28 is fixed to the gear housing 27 as shown in FIG.
A gear 29 is connected and fixed to an end portion of the screw bolt 25, and a washer 30 is fitted to the screw bolt 25 in contact with the gear 29. A peripheral groove 31 is formed on one surface of the washer 30 to form a grease reservoir, and a screw gear 32 is meshed with the gear 29. A bush 33 is in contact with the washer 30. A nut 34 is screwed onto the end portion of the screw bolt 25 that enters the bush 33. The bushes 33, 33 are fixed to the gear housing 27 and face each other with a constant gap 35. The screw gears 32, 32 are rotatably supported on the gear housing 27 by shafts 36, 36, respectively.
As shown in FIG. 5, worm gears 37, 37 similar to the screw gear 32 are coaxially fixed to the worm gears 37, 37, and the worm gears 37, 37 are electrically connected to and fixed to the gear housing 27, respectively. 38, 38 output worm shaft 39,
It meshes with 39. Thus, two electric motors 38,3
8 are arranged in a straight line with the gear housing 27 interposed therebetween, and the screw bolts 25, 25 are also arranged in a straight line in parallel with them. In the figure, 40 and 40 are electric wires of the electric motors 38 and 38, and 41 and 41 are connectors connected to the ends of these wires.

Thus, the power unit 16, 16 is the outer unit OTR
Therefore, since a large idle space is formed in the lower central part of the seat cushion,
The lower surface of the central portion of the seat cushion can be lowered, and therefore, the hip point of the seat cushion can be easily lowered.

The operation of the above embodiment will now be described. When an occupant sits on the seat cushion and a load is applied to the side bracket 2, the link 4 rotates clockwise about the shaft pin 15 in FIG. Also, when the occupant normally sits down, a load is applied to the lifter mechanism on the rear side. Therefore, the lifter mechanism on the front side is raised. Therefore, the link 6 rotates counterclockwise around the shaft pin 11, and the levers 17 and 17 are acted on to face each other. Therefore, the cover bracket is not needed.
Can be lightened. In this state, the electric motors 38, 38 are driven simultaneously or independently, and, for example, when the lever 17 is pulled backward in the longitudinal direction in FIG. Rotates about the shaft pin 11 in the counterclockwise direction, the shaft pin 12 rotates about the shaft pin 11 in the counterclockwise direction, and rotates the link 6 in the counterclockwise direction. Is rotated clockwise to raise the side bracket 2, and the opposite operation is to lower the side bracket 2. In this case, since the washer 30 is in contact with the bush 33, it becomes a metal touch and the durability is improved. Further, the washer 30 can smoothly rotate by the grease accumulated in the circumferential groove 31 formed therein.

[Advantages of the Invention] According to the above-described invention, the occupant is seated and the load applied to the screw bolt is directed toward the gear housing, and the compression force acts on the gear housing. Since it suffices to resist only the compressive force, the conventional cover bracket is not required, and therefore the weight can be reduced. Further, since the bush is fixed to the gear housing and the washer fixed to the gear side is brought into contact with the bush to form the metal touch structure, the durability of the rotating portion of the screw bolt in the gear housing is improved. Play.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a left side view, FIG. 3 is a right side view, FIG. 4 is a partially cutaway plan view of the main structure, and FIG. A side view, FIG. 6 is a perspective view of a nut block, and FIG. 7 is a perspective view of a conventional example. 1 ... Leg bracket, 2 ... Side bracket, 4,
5,6 …… Link, 7,8 …… Interlocking rod, 9,9a …… Drive lever,
11,12,13,14,15 …… Axis pin, 16 …… Power unit, 19
...... Nut block, 25 ...... Screw bolt, 27 ......
Gear housing, 29 ... Gear, 30 ... Washer, 31 ...
… Circumferential groove, 33 …… Bush, 38 …… Electric motor, OTR…
… Outer unit, INR …… Inner unit

Claims (2)

[Scope of utility model registration request] 1. A pair of left and right units for connecting a leg bracket mounted on a vehicle body or a seat slide device and a side bracket for fixing a seat cushion by a link so that the side bracket can be moved up and down by an interlocking rod. And a seat lifter comprising a substantially quadrangular frame body having a power unit for rotating the interlocking rod,
The power brackets for independently rotating the front and rear links are arranged on the leg brackets of one unit so as to face each other in a straight line, and the screw bolts for converting the rotational force of the power unit into a linear motion are faced for a straight line. So that the nut blocks are screwed onto the screw bolts, respectively, and the nut blocks are connected to the links so that when the occupant is seated on the seat cushion, a force is applied to the screw bolts so that they face each other. A seat lifter characterized by being configured. 2. A pair of left and right units for connecting a leg bracket mounted on a vehicle body or a seat slide device and a side bracket for fixing a seat cushion by a link so that the side bracket can be raised and lowered are connected by an interlocking rod. And a seat lifter comprising a substantially quadrangular frame body having a power unit for rotating the interlocking rod,
The power brackets for independently rotating the front and rear links are arranged on the leg brackets of one unit so as to face each other in a straight line, and the screw bolts for converting the rotational force of the power unit into a linear motion are faced for a straight line. Arranged in the shape of a screw, nut blocks are respectively screwed to the screw bolts, the nut blocks are connected to the links, and one face of a gear for rotating the screw bolts is brought into contact with a bush by interposing a washer, A seat lifter characterized in that the bush is supported by a gear housing.