JP2001239861A - Seat sliding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat sliding device with a lightweight gear box by preventing application of the excessive load to the gear box. SOLUTION: Two sheets of flange parts 16 are mounted at a predetermined interval on a screw shaft 12, and a load receiving member 17 having at least three load inputting parts 18, 19 to a movable rail 1, is mounted on a position held by the flange parts 16 of the movable rail 1. Whereby, the load is not applied to a gear box 7, thus dispensing with the special reinforcement, and reducing the weight of the gear box 7 in comparison with a conventional one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat slide device, and more particularly to a power type seat slide device that slides a seat back and forth by a driving force of a motor.

[0002]

2. Description of the Related Art As a conventional seat slide device of a power type for sliding a seat back and forth by a driving force of a motor, for example, a movable rail having a substantially hat shape in cross section fixed to a seat and sliding the movable rail are provided. A fixed rail movably engaged and supported and fixed to the floor, and a nut member screwed to a screw shaft fixed to the fixed rail and extending along the longitudinal direction of the movable rail. A gear box for controlling the rotation of the motor to the rotation of the screw shaft. The gear box controls the rotation of the screw shaft and slides the movable rail back and forth with respect to the fixed rail according to the rotation direction of the screw shaft. Power-type seat slide devices are known (for example,
JP-A-9-142181).

[0003]

However, in such a conventional technique, when an excessive load generated due to, for example, a vehicle collision or the like is applied to the movable rail, the load is reduced to the gear box and the nut. Since it is added to the fixed rail via a member, the strength of the fixed portion of the gearbox is required, and the strength of the gearbox itself is also required.

The present invention has been made by paying attention to such a conventional technique. For example, an excessive load generated due to a vehicle collision or the like is not applied to a gear box,
A seat slide device having a lightweight gear box is provided.

[0005]

According to a first aspect of the present invention, there is provided a movable rail having a substantially hat-shaped cross section, a fixed rail slidably engaging and supporting the movable rail, and The screw comprises a nut member formed by screwing a screw shaft that is fixed and extends along the longitudinal direction of the movable rail, and a gear box that controls the rotation of the screw shaft with the rotational force of a motor. In a seat slide device in which a movable rail is slidable back and forth with respect to a fixed rail according to a rotation direction of a shaft, the screw shaft is provided with two flange portions at a predetermined interval, and the movable rail is provided. A load receiving portion having at least three load input portions with respect to the movable rail at a position sandwiched between the flange portions; Wherein the decor.

According to the first aspect of the present invention, the screw shaft is provided with two flange portions at a predetermined interval, and is provided at a position between the flange portions of the movable rail. Since the load receiving member having at least three load input portions is disposed on the movable rail, the load applied to the movable rail is transmitted from the load input portion of the load receiving member via the screw shaft and the nut member. To the fixed rail. As described above, since the load is not transmitted to the gear box, it is not necessary to reinforce the gear box. Therefore, the weight of the gear box can be reduced by simplifying the structure of the gear box and using a material such as a synthetic resin.

According to a second aspect of the present invention, there is provided the seat slide device according to the first aspect, wherein the screw shaft is inserted into the load receiving member in a direction in which the screw shaft extends. Is formed.

According to the second aspect of the present invention, when an impact load is applied to the load receiving member by the movable rail, the load can be reliably transmitted to the screw shaft by the through hole of the load receiving member.

According to a third aspect of the present invention, in the seat slide device according to the first aspect, the screw shaft is attached to the load receiving member from a direction perpendicular to a direction in which the screw shaft extends. It is characterized in that a groove that can be inserted is formed.

According to the third aspect of the present invention, the screw shaft can be assembled after supporting the load receiving member on the movable rail in advance, and the freedom of the assembling process is ensured.

According to a fourth aspect of the present invention, there is provided the seat slide device according to any one of the first to third aspects, wherein:
The load input portion of the load receiving member is formed at an engagement portion between the movable rail and the fixed rail.

According to the fourth aspect of the present invention, since the load input portion of the load receiving member is formed at a location where the strength of the engagement portion between the movable rail and the fixed rail is strong, the load is applied. Even if the load is received, the load receiving member and both rails are hardly deformed.

[0013]

1 to 5 are views showing an embodiment of the present invention. In this embodiment, of the pair of slide rails on the left and right, only the left portion will be described as a representative.

Reference numeral 1 denotes a movable rail to which a sheet (not shown) is fixed. The movable rail 1 has a substantially hat-shaped cross section having outwardly bent portions 2 formed at both ends. Mounting holes 4, 4 are formed on the front side surface portion 3 of the movable rail 1 at predetermined intervals in the front and rear at the left and right.

The movable rail 1 is engaged with a fixed rail 5 fixed to a vehicle floor (not shown).

The fixed rail 5 has an upward U-shaped cross section with inwardly bent portions 6 formed at both ends. By engaging the folded portion 2 of the movable rail 1 with the folded portion 6 of the fixed rail 5 and disposing a roller (not shown) below the movable rail 1, the movable rail 1 It is slidable back and forth.

At the front end of the movable rail 1, there are mounted gear boxes 7, 7 for converting the driving force of the motor M along the vehicle width direction in the front-rear direction. Reference numeral 26 denotes transmission means for transmitting the rotational force of the motor M to the left and right gear boxes 7,7.

The gear box 7 is provided with a pair of left and right motor brackets 9 having mounting holes 8. The motor bracket 9 is inserted into the front end 1 a of the movable rail 1 to move the motor bracket 9. Side part 3 of rail 1
The mounting holes 4 and 8 are aligned with each other, and the pins 10 and 10 are passed therethrough. Pin 1
Both ends of 0 and 10 are fixed by E-rings 11, respectively.

A screw shaft 12 extends from the gear box 7 along the longitudinal direction of the movable rail 1.
It is rotatably supported by a gear support 25 at the end. The screw shaft 12 is screwed to a nut member 14 fixed to the bottom surface of the fixed rail 5 with a bolt 13, and depending on the rotation direction of the screw shaft 12,
The movable rail 1 slides back and forth together with the seat.

A stopper 15 is fixed at a position near the gear box 7 of the screw shaft 12 so as to come into contact with the nut member 14 when the movable rail 1 moves to the rearmost position (the rearmost position).

Further, the pin 1 of the screw shaft 12
A predetermined interval is provided between portions corresponding to 0 and 10, that is, between the pins 10 and 10, and two flange portions 16 and 16 are provided.
Are welded. A substantially bell-shaped load receiving member 17 made of an iron plate having a thickness of 3.2 mm is extended and supported on the screw shaft 12 between the flange portions 16 and 16.

That is, the position at which the load receiving member 17 is disposed depends on the flange portions 16, 16 of the movable rail 1.
The load receiving member 17 is provided between at least three load input portions 1 with respect to the movable rail 1.
8 and 19.

One load input section 18 is formed so as to project from the top of the load receiving member 17, and
Is engaged with an engagement hole 20 formed at the top of the head. A push nut 24 is engaged with the engaged load input section 18 to prevent the load input section 18 from coming off. Further, the other load input portion 19 is formed so as to protrude from a skirt portion protruding from the left and right of the load receiving member 17, and is formed at an engagement portion 22 between the movable rail 1 and the fixed rail 5. The engagement hole 21 is engaged.

The load receiving member 17 is formed with a through hole 23 through which the screw shaft 12 can be inserted from the direction in which the screw shaft 12 extends.

According to this embodiment, the screw shaft 12 is provided with two flange portions 16 at predetermined intervals, and the flange portion 16 of the movable rail 1 is provided. The load receiving member 1 having at least three load input portions 18 and 19 with respect to the movable rail 1 is positioned between the movable rails 1 and 16.
7, a load applied to the movable rail 1 due to a vehicle collision or the like, for example, a load of 1.3 tons, is transmitted from the load input portions 18 and 19 of the load receiving member 17 to the screw shaft 12 and the nut member 14. The power is transmitted to the fixed rail 5 via the power switch.

As described above, since the load applied to the movable rail 1 due to a vehicle collision or the like is not transmitted to the gear box 7, there is no need to reinforce the gear box 7 and the structure of the gear box 7 is more reduced than before. Since the material can be molded using a material that does not require strength such as simplification and synthetic resin, the weight can be reduced.

Further, when an impact load is applied to the load receiving member 17 by the movable rail 1, the load can be reliably applied to the screw shaft 12 by the through hole 22 of the load receiving member 17, and the load transmission can be reliably performed. Become.

Further, load input sections 18, 1 which are input sections of the movable rail 1 to which a load is applied to the load receiving member 17 are provided.
9 is formed integrally with the load receiving member 17,
It has a stable load transmission function without increasing the cost.

Further, since the load input portion 19 of the load receiving member 17 is formed at a location where the strength of the engaging portion 22 between the movable rail 1 and the fixed rail 5 is strong, the load receiving portion 17 is not affected by the load. The member 17 and both rails 1,
5 hardly occurs.

FIG. 6 is a diagram showing another embodiment of the present invention. That is, reference numeral 30 denotes a load receiving member. In the load receiving member 30, the load input portions 18 and 19 are formed in the same manner as in the embodiment, and the screw shaft 12 is A groove 31 that can be inserted from a direction perpendicular to the extending direction is formed. The load receiving member 30 in this example has a plate thickness of 4.
Desirably, it is 0 or more.

According to such a configuration, the load receiving member 3
After the screw shaft 12 is supported on the movable rail 1, the screw shaft 12 can be assembled into the groove 31, so that the freedom of the assembling procedure is ensured.

In this embodiment, an example in which a separate flange portion 16 is welded to the screw shaft 12 has been described, but the flange portion 16 may be formed integrally with the screw shaft 12.

[0033]

According to the first aspect of the present invention, the screw shaft is provided with two flange portions at a predetermined interval, and the movable rail is sandwiched between the flange portions. Is provided with a load receiving member having at least three load input portions with respect to the movable rail, so that the load applied to the movable rail is transferred from the load input portion of the load receiving member to the screw shaft and the nut member. To the fixed rail. As described above, since the load is not transmitted to the gear box, it is not necessary to reinforce the gear box. Therefore, the weight of the gear box can be reduced by simplifying the structure of the gear box and using a material such as a synthetic resin.

According to the second aspect of the present invention, when an impact load is applied to the load receiving member by the movable rail, the load can be reliably applied to the screw shaft by the through hole of the load receiving member. The strength of the member will be satisfactory.

According to the third aspect of the present invention, the screw shaft can be assembled after supporting the load receiving member on the movable rail in advance, and the freedom of the assembling procedure is ensured.

According to the fourth aspect of the present invention, since the load input portion of the load receiving member is formed at a location where the strength of the engagement portion between the movable rail and the fixed rail is strong, the load is applied. Even if the load is received, the load receiving member and both rails are hardly deformed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a seat slide device according to an embodiment of the present invention.

FIG. 2 is a side view showing the seat slide device of FIG.

FIG. 3 is a sectional view taken along the line SA-SA shown in FIG. 2;

FIG. 4 is a perspective view of the load receiving member of FIG. 3;

FIG. 5 is a perspective view showing an engagement relationship between a front end of a movable rail and a load receiving member.

FIG. 6 is a perspective view corresponding to FIG. 4 according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable rail 5 Fixed rail 7 Gear box 10 Pin 12 Screw shaft 14 Nut member 16 Flange part 17, 30 Load receiving member 18, 19 Load input part 22 Mesh part 23 Through-hole 31 Groove part

Claims (4)

[Claims] 1. A movable rail having a substantially hat-shaped cross section, a fixed rail slidably engaging and supporting the movable rail, and a fixed rail fixed to the fixed rail and extending along a longitudinal direction of the movable rail. A nut member formed by screwing a screw shaft that extends and a gear box that controls the rotation of the screw shaft with the rotation force of a motor. In the seat slide device, which is slidable back and forth, the screw shaft is provided with two flanges at a predetermined interval, and the movable rail is sandwiched between the flanges,
A seat slide device comprising a load receiving member having at least three load input portions disposed on the movable rail. 2. The seat slide device according to claim 1, wherein the load receiving member is formed with a through hole through which the screw shaft can be inserted in an extending direction of the screw shaft. Characteristic seat slide device. 3. The seat slide device according to claim 1, wherein the load receiving member is formed with a groove through which the screw shaft can be inserted in a direction perpendicular to a direction in which the screw shaft extends. A seat slide device comprising: 4. The seat slide device according to claim 1, wherein the load input portion of the load receiving member is formed at an engagement portion between the movable rail and the fixed rail. A seat slide device, comprising: