JP2002205584A - Lifter device for vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifter device for a vehicular seat that can improve the cushioning effect of a seat cushion. SOLUTION: One support shaft 7 and two rotary shafts 25 and 26 are all stretched in positions forward of a hip point H between a pair of left-right rails 7. The absence of rigid members near the hip point H improves the cushioning effect of the seat cushion and also is effective in preventing a submarine phenomenon where only the lower half of an occupant body slides forward in a vehicle collision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat lifter for moving a seat cushion up and down.

[0002]

2. Description of the Related Art Some seats of a vehicle are provided with a lifter device for moving a seat cushion up and down in order to adjust a viewpoint height of a occupant and to adjust a sitting comfort.

[0003] In this type of lifter device, it is necessary to simultaneously raise and lower the front and rear portions of the seat cushion. The structure in which the whole seat cushion is moved up and down by rotating the piece by a motor, converting the turning power into a vertical force through a transmission mechanism such as a link, and acting on the front and rear of the seat cushion. (For a similar technique, see Japanese Patent Application Laid-Open No. 8-156664).

[0004] The force for rotating each bracket piece is determined by a support shaft attached to one support shaft installed between the left and right rails.
Obtained from two motors. The support shaft is installed at an intermediate position between the front and rear of the rail, and each motor faces in a different direction from front to back, and supports a nut screwed on a lead screw of each motor in a support hole of a pair of corresponding bracket pieces, and By moving the nut back and forth with the rotation of the screw, each bracket is rotated as described above.

[0005]

However, in such a conventional structure, a support shaft is provided at an intermediate position between the front and rear below the seat cushion, and motors which are respectively directed to the support shaft in the front-rear direction. Since the mechanism is attached, a sufficient space for securing the cushioning property cannot be obtained below the seat cushion, and the cushioning property of the seat cushion is hindered.

The present invention has been made in view of such a conventional technique, and provides a vehicle seat lifter device capable of improving the cushioning properties of a seat cushion.

[0007]

According to the first aspect of the present invention,
One support shaft and a pair of left and right rails fixed to a seat cushion having a built-in cushion frame having at least a main portion formed around the hip point and an inclined portion formed at the front side of the main portion. , Two rotating shafts are installed, and the supporting shaft is
Attaching two motors rotatable with respect to the support shaft, protruding lead screws each having a nut screwed from the two motors, and a pair of brackets facing each rotation shaft at a predetermined interval. Each end of the bracket is fixed, and both ends of the nut are rotatably supported in support holes formed in the pair of brackets, and the lead screw of each motor is rotated to rotate the bracket. Of the vehicle seat, which converts the rotational force of the bracket piece into a force in the up and down direction, one of which acts on the front of the seat cushion, and the other acts on the rear, thereby moving the entire seat cushion up and down. A lifter device, wherein all of the one support shaft and the two rotation shafts are located at front positions of inclined portions of the cushion frame. It was set.

According to the first aspect of the present invention, all of the one support shaft and the two rotary shafts are erected at the front side of the inclined portion of the cushion frame, so that the cushion near the hip point of the seat cushion is provided. There is no obstacle to the performance, and the cushioning properties of the seat cushion are improved. In addition, as the cushioning property is improved, the occupant's hip point is lowered, and the vicinity of the inclined part of the seat cushion is hardened, so that during the collision of the vehicle, only the lower body of the occupant slides forward to prevent the `` submarine phenomenon '' effective.

According to the second aspect of the present invention, the positions of the bracket pieces on each rotating shaft are offset in the left-right direction.

According to the second aspect of the present invention, since the bracket pieces of each rotating shaft are offset in the left-right direction, the bracket pieces are less likely to interfere with each other, and the rotating shafts can be installed in a state of being close to each other. . Therefore, even in a narrow space near the front end below the seat cushion,
The two rotating shafts can be reliably installed.

According to a third aspect of the present invention, the support shaft has a cross section in which the upper and lower ends of a column are cut flat, and both ends of the support shaft are fixed to the rails.

According to the third aspect of the present invention, since the support shaft has a sectional shape in which the upper and lower ends of the cylinder are cut flat,
The work of fixing both ends to the rail using the flat surface is easy to perform. After being fixed, it is difficult to rotate due to its cross-sectional shape, and the rigidity of the front end of the rail can be secured.
Furthermore, the motor can be rotatably supported by utilizing the arc surface of the support shaft. In this way, this support shaft is easy to fix, secures the rigidity of the front end of the rail,
It has the three functions of supporting the rotation of the motor.

[0013]

FIG. 1 shows a preferred embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 shows a frame structure of a front seat of an automobile. The skeletal structure on the seat cushion side is basically formed of a pair of left and right fixed rails 1, a movable rail 2 slidably engaged with the rails, and a cushion frame 3 mounted on the movable rails 2. Have been. The skeletal structure on the seatback side is formed by a seatback frame 4 attached to the rear end of the movable rail 2 so as to be able to rotate back and forth.

The cushion frame 3 has a main portion 3a formed at a deep position for ensuring cushioning properties, an inclined portion 3b for preventing submarine rising on the front side of the main portion 3a, and an inclined portion 3b. , A lifter mechanism such as lifter motors 10 and 11 is built in the front of the inclined portion 3b and below the horizontal portion 3c.

At the forefront of the movable rail 2, a flexible shaft 6 rotated by a slide motor 5 is provided. The movable rail 2 slides back and forth by the rotational force of the motor 5. Immediately behind the flexible shaft 6, a support shaft 7 is provided between the left and right movable rails 2. The support shaft 7 is an extruded product made of an aluminum alloy, and has a cross-sectional bale shape in which upper and lower ends of a cylinder are cut flat. Therefore, the work of fixing the movable rail 2 to the movable rail 2 by the screw 8 can be easily performed by using the flat portion. After being fixed, it is difficult to rotate due to its cross-sectional shape, and rigidity at the front end of the movable rail 2 is secured. At the center of the support shaft 7, a cover 9 for protecting the flexible shaft 6 is attached.

On both left and right sides of the support shaft 7, lifter motors 10 and 11, which face rearward, are rotatably mounted. A pair of right and left support pieces 14 are formed in the gear units 12 and 13 of the motors 10 and 11, and a circular hole 14a formed in the support piece 14 is inserted into the support shaft 7, and an inner edge of the circular hole 14a is formed. , By contacting the circular arc surface of the support shaft 7, the motor 10,
11 is rotatably supported. That is, the support shaft 7 is easy to fix, secures the rigidity of the front end of the movable rail 2, and secures the motor 10, 1
It has three functions of one rotation support. Motor 1
The gear units 0 and 11 are integrated with the gear units 12 and 13, and reduce the rotation of a rotation shaft (not shown) provided inside the gear units 12 and 13 and change the direction to the rear. Lead screws 15, 16 projecting rearward from 12, 13 can be rotated, respectively. The rearward state of the lead screws 15, 16 is the "use angle" of the lead screws 15, 16.

A substantially cylindrical nut 18 or 19 having a cylindrical surface and movable between front and rear end stoppers 17 is screwed to the lead screws 15 and 16.
One end of each of the nuts 18 and 19 is formed with a first stopper 20 in the form of a circular flange having a larger diameter than the nuts 18 and 19. A pair of slits 21 are formed slightly inside the first stopper 20 at opposite positions to partially narrow the cross-sectional shapes of the nuts 18 and 19. At the other ends of the nuts 18 and 19, a second stopper 22 having a projecting shape is formed. A dimension S1 from the slit 21 to the other end of the nuts 18, 19 is formed smaller than an interval S2 between bracket pieces 23a, 23b, 24a, 24b described later.

On the other hand, slightly behind the support shaft 7 supporting the motors 10 and 11, two rotating shafts 10 and 11 are installed rotatably between the left and right movable rails 2. These rotating shafts 10, 11
Are located at the forward position together with the support shaft 7, and both are located sufficiently forward of the hip point H seated on the seat cushion.

The front rotating shaft 10 is for applying a vertical force to a base 27 fixed to the front end of the cushion frame 3.
Is for applying a vertical force to the base 28 at the rear end of the cushion frame 3.

A pair of left and right bracket pieces 23a and 23b are fixed to the right side of the front rotating shaft 10 by welding.
A lever 29 is fixed to the left side by welding. The pair of left and right bracket pieces 23a and 23b have support holes 30 in both.
a and 30b are formed. These support holes 30a,
30b is basically a circle having a diameter corresponding to the nut 18, and has a notch formed below one of the support holes 30a, and has a notch formed above the inner edges of the other support holes 30a and 30b. , A small recess 32 is formed.

Next, an operation procedure for rotatably supporting both ends of the nut 18 in the support holes 30a and 30b will be described with reference to FIG. First, the lead screw 15 is turned upward (see FIG. 6A). This upward state corresponds to the lead screw 15 according to this embodiment.
Is the “non-use angle”. Next, lead screw 15
6 with the slit 21 facing upward, the slit 21 of the nut 18 is inserted through the passage 31 of the one support hole 30a [FIG.
(See (b)). At this time, since the dimension S1 of the nut 18 is smaller than the predetermined interval S2 between the bracket pieces 23a and 23b, the other end of the nut 18 does not interfere with the other bracket piece 23b and the gap between the bracket pieces 23a and 23b is surely ensured. (See FIG. 6C). Then, the nut 18 is slid to the other side to allow the second stopper 22 to pass from the concave portion 32 to the outer surface side, remove the slit 21 from the position of the one support hole 30a, and remove the first stopper 20 from the outer surface of the one bracket piece 23a. (See FIG. 6D).

Finally, when the lead screw 15 is set at the "use angle", the second stopper 22 is displaced from the position of the concave portion 32 and comes into contact with the outer surface of the other bracket piece 23b (see FIG. 6E). In this state, each support hole 30a, 30b
, The arc surface of the nut 18 abuts, and the first stopper 20 and the second stopper 22 engage with the outer surfaces of the left and right bracket pieces 23a, 23b, respectively. Is rotatable in the support holes 30a and 30b in a state where the disengagement is securely prevented. In this way, without using a separate component such as a conventional spacer,
Since both ends of the nut 18 can be reliably supported in the support holes 30a and 30b in a state where the nuts 18 are prevented from coming off, it is possible to reduce the number of parts and improve the work efficiency.

Then, one of the bracket pieces 23a and 23b on which the nut 18 is supported is
Are connected to the front base 27 of the cushion frame 3 via links 33 so as to convert the rotational power of the bracket pieces 23a and 23b into a vertical force.

A pair of left and right bracket pieces 24a and 24b are fixed to the rear rotating shaft 11 on the left side by welding, and a lever 34 is fixed on the right side by welding. Since the positions of the bracket pieces 24a and 24b are left and right opposite to the above-described front rotating shaft 10, the bracket pieces 23a and
3b, 24a, 24b are hard to interfere with each other, and can be installed with the rotating shafts 10, 11 close to each other. Therefore, even in the narrow space near the front end below the seat cushion, the two rotating shafts 10 and 11 can be reliably installed.

The pair of left and right bracket pieces 24a, 24b of the rear rotating shaft 11 are also provided with support holes 30a, 30b in the same manner as described above, and screwed to the lead screw 16 of the motor 11 on the left side. Both ends of the nut 19 are inserted and rotatably supported. Therefore, the same parts as those in the above-described structure are denoted by the same reference numerals, and redundant description of the mounting procedure and the like will be omitted.

One of the bracket pieces 24a and 24b of the rear rotating shaft 11 and the lever 34 are supported at the front end of a horizontal link 35 extending in the front-rear direction along the movable rail 2. The horizontal link 35 extends to the rear, and is pivotally supported at one end of a crank 36 that is rotatably attached to the rear end of the movable rail 2. The other end of the crank 36 is pivotally supported by the base 28 at the rear end of the cushion frame 3. A connecting bar 37 is provided at the rearmost portion of the movable rail 2 to secure the rigidity of the rear portion.

The rotating shafts 10 and 1 having the above-described structure are used.
When the motors 10 and 11 attached to 1 are rotated at the “use angle” with the lead screws 15 and 16 facing backward, the nuts 18 and 19 move back and forth with the rotation of the lead screws 15 and 16. , Each bracket piece 2
3a, 23b, 24a, 24b are the rotating shafts 10, 1
1 turns.

In the process of moving the nuts 18 and 19 back and forth, the use angle and the non-use angle of the lead screws 15 and 16 are greatly different, so that the slit 21 matches the passage 31 or the second stopper 22 Recess 32
Does not coincide with each other, and the nuts 18 and 19 are reliably prevented from coming off from the support holes 30a and 30b at both ends. In addition, since the first stopper 20 is a circular flange having a larger diameter than the nuts 18 and 19, the formation of the passage 31 reduces the strength of one of the bracket pieces 23 that tends to decrease.
a, 24a also have a first stopper 2 on the entire outer surface thereof.
0 engages over a wide area, preventing partial deformation of one of the bracket pieces 23a, 24a.

In such a reliable state, the bracket piece 2
3a, 23b, 24a, 24b are the rotating shafts 10, 1
By rotating each one, the lever 2 in the opposite position
9 and 34 also rotate, so the front bracket pieces 23a,
The lever 23 b and the lever 29 move the base 27 at the front end of the cushion frame 3 up and down via the link 33, and the rear bracket pieces 24 a and 24 b and the lever 34 move the rear crank 36 through the horizontal link 35. By rotating, the base 28 at the rear end of the cushion frame 3 is moved up and down. Therefore, the cushion frame 3 moves up and down as a whole, and it is possible to adjust the viewpoint height of the occupant's seat or to adjust the sitting comfort.

And, in particular, one support shaft 7,
Since all of the two rotating shafts 10 and 11 are installed at a position on the front side of the hip point H, the hip point H
Since the vicinity is formed deep, the cushioning properties of the seat cushion are improved. In addition, the cushioning property is improved, the position of the occupant's hip point H is lowered, and the vicinity of the inclined portion 3b of the seat cushion is the support shaft
Further, since the rotation shafts 10 and 11 become stiffer, it is also effective in preventing the “submarine phenomenon” in which only the lower body of the occupant slides forward in the event of a vehicle collision.

In the above description, the rotational force of the front and rear bracket pieces 23a, 23b, 24a, 24b is converted into a vertical force by the link 33 and the crank 36 and transmitted to the cushion frame 3. However, the structure is not limited to this, and any structure may be used as long as the structure can move the cushion frame 3 up and down.

[0032]

According to the present invention, all of the one support shaft and the two rotary shafts are erected at the front side of the inclined portion of the cushion frame. As a result, the cushioning properties of the seat cushion are improved. In addition, the cushioning property is improved, the hip point of the occupant is lowered, and the vicinity of the inclined portion of the cushion frame becomes hard,
It is also effective in preventing the "submarine phenomenon" in which only the lower body of the occupant slides forward during a vehicle collision.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a skeleton structure of a sheet according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a skeletal structure of the sheet of FIG.

FIG. 3 is a side view showing a power transmission structure related to the front rotation shaft of FIG. 1;

FIG. 4 is a side view showing a power transmission structure related to the rear rotating shaft of FIG. 1;

FIG. 5 is an exploded perspective view showing a structure around a bracket piece of FIG. 2;

FIG. 6 is a view showing a procedure for attaching the nut of FIG. 2 to a bracket piece.

[Explanation of symbols]

 2 Movable rail 3 Cushion frame 7 Support shaft 10, 11 Motor 15, 16 Lead screw 18, 19 Nut 20 First stopper 21 Slit 22 Second stopper 23a, 23b, 24a, 24b Bracket piece 25, 26 Rotating shaft 30a, 30b Support hole 31 Passage 32 Recess H Hip point

Claims (3)

[Claims] 1. A pair of right and left rails fixed to a seat cushion having a built-in cushion frame having at least a main portion formed around a hip point and an inclined portion formed at the front side of the main portion. A support shaft and two rotation shafts are installed. Two motors rotatable with respect to the support shaft are mounted on the support shaft, and nuts are screwed from the two motors. The ends of a pair of bracket pieces facing each other at a predetermined interval are fixed to each rotating shaft, and both ends of the nut are turned into support holes formed in the pair of bracket pieces. By movably supporting and rotating the lead screw of each motor,
By turning the bracket piece and converting the turning power of the bracket piece into a vertical force, one acts on the front of the seat cushion and the other acts on the rear, thereby moving the entire seat cushion up and down. A lifter device for a vehicle seat, wherein all of the one support shaft and the two rotation shafts are installed at a front side of an inclined portion of the cushion frame. . 2. The lifter device for a vehicle seat according to claim 1, wherein the positions of the bracket pieces on each of the rotating shafts are offset in the left-right direction. 3. The lifter device for a vehicle seat according to claim 1, wherein the support shaft has a cross-sectional shape in which upper and lower ends of a cylinder are cut flat, and both ends of the support shaft are rails, respectively. A lifter device for a vehicle seat, the lifter device being fixed to the vehicle.