JPH0487842A - Seat sliding device for vehicle - Google Patents

Abstract

PURPOSE:To prevent the occurrence of interference between a drive motor and a cross member by locating a female screw member, supported in a state to regulate axial movement, on the lower rail side secured on a vehicle floor surface and providing a drive motor to transmit rotation to the female screw member. CONSTITUTION:A seat slide device 17 for a vehicle is provided with left and right lower rails 15a and 15b secured on a vehicle floor surface through a mounting bracket 13 and left and right upper rails 16a and 16b slidably engaged with the lower rails 15a and 15b. In which case, left and right screw shafts 19a and 19b are arranged on the inner side of the left and right upper rails 16a and 16b, and supported in a rotation-constrained state to a securing bracket 21. Meanwhile, a drive motor 29 is mounted on the right lower rail 15b through a mounting bracket 27. Through running of the drive motor, left and right toothed pulleys 34 and 35 around which a toothed endless belt 26 is run are rotated through a gear box 30. Through rotation of a nut joined in a screwed-in state with the screw shafts 19a and 19b, the shafts 19a and 19b are longitudinally moved.

Description

TECHNICAL FIELD The present invention relates to a powered vehicle seat slide device that moves a vehicle seat, particularly a front seat of a passenger car, back and forth.

"Prior art and its problems" This type of powered seat slide device includes left and right lower rails fixed to the vehicle floor, and an upper rail fixed to the seat and slidably fitted into the lower rails. There is. A drive unit is provided between the lower rail and the upper rail to move the seat back and forth and stop it at a desired position.

An example of the drive mechanism includes a screw shaft that is rotatably supported along the left and right upper rails, and a feed nut that is non-rotatably supported on the left and right lower rails and screwed onto the screw shaft. be. In this drive mechanism, since a screw shaft is provided on the upper rail side that moves back and forth, a drive motor that transmits rotation to the shaft is installed on the upper rail side. This drive motor is installed in the center of the bracket that passes over the left and right upper rails.
The driving force is transmitted to the left and right screw shafts via gear boxes provided corresponding to the left and right screw shafts, respectively. Also, the above lower rail is (7th
15) in the figure, vehicle frame 11 to improve floor strength
It is fixed via a rail mounting bracket 13 to the tip of a cross member 12 provided along the lateral direction of the vehicle at the front and rear sides of the rail.

Therefore, by rotating the left and right screw shafts with respect to the feed nut by the drive motor and moving the left and right screw shafts relative to the feed nut, the upper rail, that is, the seat can be moved back and forth together with the shafts.

However, in the structure of the seat slide device described above, since the drive motor moves back and forth together with the upper rail, the problem is how to arrange the members so that the moving drive motor does not interfere with the cross member 12. In particular, in vehicles such as sports cars where the relationship between the floor surface and the seat hip point is narrow, the possibility of interference between the cross member 12 and the drive motor is more pronounced, and it is necessary to take great care in arranging the drive motor. Freedom in design is also lost.

``Object of the Invention'' The purpose of the present invention is to obtain a vehicle seat slide device that can reliably prevent interference between a drive motor and a cross member, and can also expand the degree of freedom in terms of structure and design. There is.

"Summary of the Invention" The present invention includes a lower rail fixed to a vehicle floor surface, an upper rail slidably fitted to the lower rail and fixed to a seat, and a drive mechanism for moving the upper rail with respect to the lower rail. In the vehicle seat slide device, the drive mechanism is provided on the upper rail side,
a screw shaft disposed along the rail with rotation restrained; a female screw member screwed onto the screw shaft so as to be relatively rotatable and supported on the lower rail side with regulated movement in the axial direction; and a female screw member supported on the lower rail side. , and a drive motor that transmits rotation to the female threaded member.

According to the above configuration, it is possible to reliably prevent the problem of interference between the drive motor and the cross member when driving the seat slide device.

In addition, female threaded members are screwed into screw shafts provided on the left and right upper rails, respectively, and the rotation of the drive motor is transmitted to one of the left and right female threaded members via a gear in a gear box provided integrally with the motor. However, it is preferable that the rotation is transmitted to the other female threaded member via an endless belt. According to this, the driving force transmission mechanism can be simplified.

“Embodiments of the invention” The invention will now be described with reference to illustrated embodiments.

FIG. 1 is a perspective view of the vehicle seat slide device 17 with the seat removed, and FIG. 2 is a perspective view showing the main parts on the left upper rail side. Note that arrow F in the figure is
Shows the front side of the vehicle.

The vehicle seat slide device 17 has left and right lower rails 15a, 15b whose front and rear parts are fixed on cross members 12.12 provided at the front and rear of the vehicle floor surface 11 via rail mounting brackets 13. . Left and right upper rails 16a, 1 are attached to the left and right lower rails 15a, 15b.
6b are fitted in a slidable manner. A fixed support member 10 for reinforcement is provided between the left and right lower rails 15a and 15b.

A seat S (see FIG. 7) is fixed on the left and right upper rails 16a, 16b, and the upper rails 16a,
16b slides the seat S back and forth by moving back and forth relative to the left and right lower rails 15a, 15b. Left and right screw shafts 19a and 19b are provided inside the left and right upper rails 16a and 16b and run along the rails 16a and 16b. The screw shafts 19a, 19b are supported by shaft fixing brackets 21 fixed along the left and right upper rails 16a, 16b, respectively, while being restrained from rotating.

A nut mounting bracket 2 is attached to the front of the left lower rail 15a.
2 is fixed, and a left screw shaft 19a passes through this bracket 22 so as to be freely movable in the axial direction. The nut mounting bracket 22 supports a left feed nut 23a screwed onto the left screw shaft 19a while restricting its axial movement. A left toothed pulley 34 is coaxially and integrally provided with this left feed nut 23a. This left toothed pulley 34 idles the left screw shaft 19a and is connected to the hollow portion 24 (fifth
(see figure), and a tooth surface 25 formed at the center of the outer periphery.

A drive motor 29 is fixed to a motor mounting bracket 27 fixed to the right lower rail 15b. As a result, the drive motor 29 is restricted from moving in the axial direction (back and forth direction). The drive motor 29 is driven by receiving electricity from a battery (not shown) based on the operation of an operation switch (not shown).

Furthermore, the drive motor 29 is constructed integrally with a gear box 30, as shown in FIGS. 3 to 6. The gear box 30 has a casing 30b fixed to a drive motor 29, and a lid 30a fixed to the casing 30b from the side, and has a worm gear 32 rotated by the drive motor 29 inside, and a worm gear 32 rotated by the drive motor 29. The worm wheel 31 has a worm wheel 31 which is meshed orthogonally to the worm wheel 32.

One end of an elongated right feed nut 23b is fitted into the inner periphery of the worm wheel 31, with relative rotation being restricted by a spline or the like. The right feed nut 23b is formed such that the portion that fits with the worm wheel 31 is bulged out from the other portion, and is structured to prevent it from coming off from the gear box 30 in the axial direction. Furthermore, a right toothed pulley 35 having a hollow portion 24 is provided at the other end of the feed right nut 23b.
are fitted. The pulley 35 is fixed coaxially and integrally to the feed right nut 23a by pressing a set screw 33 passed through one end of the pulley 35 against the flat surface of the feed right nut 23a. The right screw shaft 19b passes through the left feed nut 23b and the left toothed pulley 35, which are coaxially integrated. The screw shaft 19b is screwed into a female thread formed on the inner periphery of the right feed nut 23b.

A toothed endless belt 26 is wound between the left toothed pulley 34 and the right toothed pulley 35, and the rotation of the right toothed pulley 35 rotated by the drive motor 29 is transferred to the left toothed pulley 34.
It is configured so that the left and right screw shafts 19a and 19b can equally move back and forth.

Vehicle seat slide device 17 having such a configuration
works as follows.

When an operation switch (not shown) is operated appropriately, the drive motor 29 is supplied with electricity from the battery and is driven. Then, on the right upper rail 16b side, the worm wheel 31 rotates due to the rotation of the worm gear 32, and the feed right nut 23b, which is located on the inner circumferential side and whose movement in the axial direction is regulated, starts to rotate. The right screw shaft 19b, whose directional movement is not restricted, moves relative to the right feed nut 23b in the axial direction.

This rotation of the right feed nut 23b is simultaneously carried out by the right toothed pulley 3.
5, and the left toothed pulley 3 via the toothed endless belt 26.
4. As a result, the left toothed pulley 34 and the left feed nut 23a are also rotated in the same direction, so the left screw shaft 19a whose rotation is restricted also moves in the axial direction with respect to the left feed nut 23. That is, since the left and right screw shafts 19a and 19b move axially in the same direction, the left and right upper rails 16a and 16b, that is, the seat S, are freely moved in the front or rear direction. Then, by turning off the operation switch, the seat S can be stopped at a desired position.

In addition, the present seat slide device 17 can move the drive motor 29 to the right side, so that the left and right upper rails 16a and 1
6b is an effective space that does not interfere with the drive motor 29. Then, the rotation of the drive motor 29 is
The rotation is transmitted to the right screw shaft 19b through the gear in the gear box 30, and to the left screw shaft 19a through the toothed endless belt 26, so an expensive gear box is also provided on the left screw shaft side to control the rotation. Compared to the case of transmission, the structure can be simplified and manufactured at relatively low cost.

In this embodiment, the drive motor 29 was provided on the right side of the vehicle seat slide device 17, but the drive motor 29 is provided on the left side of the seat slide device 17 so that the driving force is transmitted from the left side to the right side. It may be configured as follows. In addition, a toothed endless belt 2 is used to transmit the driving force between the left and right rails.
6 was used, but the present invention is not limited to this, and a chain or a gear train may also be used. In this case, the left and right toothed pulleys are 34.35
can be replaced with sprockets or gears, respectively.

``Effects of the Invention'' As described above, the vehicle seat slide device of the present invention can move the seat with a structure in which the drive motor is supported on the lower rail side fixed to the vehicle floor. It is possible to reliably prevent inconveniences such as the drive motor moving together with the upper rail and interfering with the cross member as in the device. As a result, even in a vehicle such as a sports car where the relationship between the floor surface and the seat hip point is narrow, the degree of freedom in designing the seat area can be increased, and a structurally reasonable seat slide device can be achieved.

In addition, the rotation of the drive motor is transmitted to one of the female threaded members screwed onto the left and right screw shafts via a gear in a gear box provided integrally with the motor, and transmitted to the other female threaded member via an endless belt. If configured to transmit this rotation, it is possible to provide a simple and inexpensive drive force transmission mechanism that eliminates one of the left and right gear boxes used in conventional seat slide devices.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the entire vehicle seat slide device according to the present invention, FIG. 2 is a perspective view showing the main part on the left side of FIG. 1, and FIG. 3 is a perspective view showing an integrated drive motor. and a diagram showing the gear box, etc., Figure 4 is a view of Figure 3 seen from the gear box side, Figure 5 shows the worm wheel, feed right nut,
6 is a cross-sectional view showing the connection state of the right screw shaft and the right toothed boob, FIG. 6 is a view of FIG. 4 viewed from the left side of the figure with the lid removed, and FIG. 7 is a cross-sectional view of the cross member. It is a schematic side view which shows the state of the sheet|seat installed on top. 10...Fixed support member, 11...Vehicle floor surface, 12.
...Cross member, 13...Rail mounting bracket, 15a, 15b =...Left and right lower rails, 16a. 16b... Left and right upper rails, 17... Vehicle seat slide device, 1.9a, 19b... Left and right screw shafts, 21... Shaft fixing bracket, 2
2... Nut mounting bracket, 23a... Left feed nut (female thread member), 23b... Right feed nut (wing thread member), 24... Hollow part, 25... Tooth surface, 26...
... Toothed endless belt, 27 ... Motor mounting bracket, 29 ... Drive motor, 30 ... Gear box, 3
0a...Lid body, 30b...Casing, 31...
Worm wheel, 32... Worm gear, 33...
Set screw, 34.35... Left and right toothed pulleys. Patent applicant: Shirokie Gyo Co., Ltd. Agent: Kunio Miura

Claims (2)

[Claims] (1) A vehicle seat slide device having a lower rail fixed to the vehicle floor; an upper rail slidably fitted to the lower rail and fixed to the seat; and a drive mechanism for moving the upper rail relative to the lower rail. , the drive mechanism is provided on the upper rail side with a screw shaft that is restrained from rotating along the rail; the screw shaft is screwed onto the screw shaft so as to be relatively rotatable, and is supported on the lower rail side with axial movement restricted; A vehicle seat slide device comprising: a female threaded member; and a drive motor supported on the lower rail side and transmitting rotation to the female threaded member. (2) In claim 1, the screw shafts are provided on the left and right upper rails, the female thread members are screwed onto the left and right screw shafts, and the rotation of the drive motor is applied to one of the left and right female thread members. A vehicle seat slide device in which rotation of one female threaded member is transmitted via a gear in a gear box provided integrally with the motor and transmitted to the other female threaded member via an endless belt.