JP3844127B2 - Vehicle seat slide device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat slide device in which fixing means between a lower rail and a floor (floor) is improved.
[0002]
[Prior art]
The vehicle seat slide device is used to move the vehicle seat in the front-rear direction of the vehicle, and has a lower rail that is fixed to at least the floor.
As shown in FIGS. 6 and 7, the pair of spaced lower rails 1, 1 are fixed to the floor 3 using bolts 5, nuts 6, and washers 7 at the front and rear of the base portion 4. . On the lower rails 1 and 1 fixed to the floor 3, upper rails 2 and 2 for holding a seat (not shown) are slidable in the front-rear direction.
[0003]
As shown in FIG. 6, the lower rails 1, 1 have a U-shaped main body portion and an inverted L-shaped flange portion provided on the top of the opposing side wall portion of the main body portion, and the upper rails 2, 2 The upper rails 2 and 2 are slidably arranged inside the flange portion via shoes or bearings 8.
[0004]
The lower rails 1 and 1 are fixed to the floor 3 by tightening bolts 5 between the flange portions of the nut 6 fixed to the lower surface of the floor 3. The bolt 5 is fastened to the nut 6 through the lower hole 9 of the base portion of the lower rails 1, 1.
[0005]
As a method of fixing the lower rails 1 and 1 to the floor 3, there is also a method of fixing brackets (not shown) to the front and rear portions of the opposing side walls of the lower rails 1 and 1, and fixing these brackets to the floor using bolts and nuts. Yes (see JP 2001-105937 A).
[0006]
[Problems to be solved by the invention]
In the example shown in FIG. 6, in order to make it easy to align the center of the nut 6 fixed to at least two places on the floor 3 and the center of the lower hole 9 drilled in the front and rear portions of the lower rails 1, 1, The lower hole 9 is formed larger than the diameter of the bolt 5 in order to absorb the pitch error between the holes 9. In order to sufficiently secure the wrapping margin (fitting margin) of the head of the bolt 5 with respect to the base portion having the large bore 9, it is attempted to enlarge the head of the bolt 5 and the washer 7. The size is also limited by the dimension between the flange portions 1 and 1.
[0007]
The pitch error of the lower holes 9 in the front and rear portions of the base portions of the lower rails 1 and 1 is suppressed to a necessary minimum, making it difficult to manufacture the lower rails 1 and 1 and attach the lower rails 1 and 1 to the floor 3.
In addition, increasing the diameter of the lower hole 9 is not preferable because it reduces the lapping margin between the bolt head and the base portion of the lower frame 1, 1 and causes insufficient mounting strength.
In addition, the method of fixing the lower rail to the floor using the bracket is designed to increase the mounting strength because the load center when the load acting on the seat is transmitted to the lower rail and the mounting position of the bracket on the floor are offset. There is a drawback that the bracket is large. In addition, when the bracket is fixed to the floor, there is a drawback that a force that distorts the cross-sectional shape acts on the lower rail.
[0008]
Therefore, this invention makes it the subject which should be solved to eliminate the malfunction of the prior art mentioned above.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention basically uses technical means for fixing a bracket in which a washer is loosely held in a lower hole portion of a base portion of a lower rail.
By adopting this basic technical means, it is possible to install a washer large enough for the diameter of the pilot hole through which the bolt passes, so that the bolt head lapping margin can be secured sufficiently and the washer is held in a loose relationship with the bracket. Therefore, it is very easy to insert the bolt into the pilot hole without the washer being greatly disengaged from the pilot hole. In addition, the bracket and washer can be attached to the lower rail not by using the gap between the brackets facing each other in the assembly process, but by using the opening at the front and rear ends of the lower rail in the lower rail manufacturing process. The optimal washer size and shape can be selected.
In addition, the washer held by the bracket is not lost when the seat slide is transported.
[0010]
Specifically, according to the present invention, in the seat slide device having the lower rail that holds the upper rail that holds the vehicle seat slidably in the longitudinal direction of the vehicle and is fixed to the floor of the vehicle, the lower rail 10 includes There is provided a vehicle seat slide device comprising: a bracket 15 disposed; and a washer 14 movably held in the bracket 15 so as to be freely movable with respect to the bracket 15 .
[0011]
According to this seat slide device, it is possible to absorb an error between the pitch between the nuts fixed to the floor and the pitch between the lower holes formed in the front and rear portions of the lower rail, and between the pair of lower rails separated in the vehicle width direction. It is also possible to absorb dimensional errors.
[0012]
Preferably, the bracket has a box shape, the cover portion has an opening, the washer is square, and the bolt passes through the bracket opening, the washer bolt insertion hole, and the lower rail base hole. Then, it is screwed into a nut fixed to the floor, the lower hole is larger than the bolt insertion hole, and the bolt head is seated on the washer.
[0013]
More preferably, the bracket has an arm with a pin, the pin is snapped into the hole of the base portion of the lower rail, and the bracket and the washer are disposed at the front and rear portions of the base portion of the lower rail.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described with reference to FIGS.
The cross-sectional shape of the lower rail 10 includes a U-shaped main body portion 11 and flange portions 12 and 12 provided at the tops of opposite side portions of the main body portion 11. An upper rail 13 having an inverted T-shape is attached. Bearings 23, 23 provided on the upper rail 13 are disposed inside the flange portions 12, 12 of the lower rail 10, and allow the upper rail 13 to slide in the front-rear direction with respect to the lower rail 10.
[0015]
A washer 14 and a bracket 15 are attached to the inside of the front and rear portions of the base portion of the lower rail 10.
As shown in FIG. 2, the washer 14 has a square shape, is large enough to receive the head of the bolt 5, and has a bolt insertion hole 16 at the center thereof. The bolt insertion hole 16 has a normal diameter through which the bolt 5 is passed.
The bracket 15 has a box shape, and the cover portion 17 has an opening, that is, an octagonal hole 18 in the illustrated example. The polygonal or octagonal hole 18 is sized to prevent the washer 14 from coming out and to prevent the bolt head from coming into contact with the cover 17 when the bolt is tightened.
The arm 20 with the pin 19 is extended from the opposite side wall of the bracket 15.
[0016]
The bracket 15 may be a steel sheet metal press-molded product or a hard synthetic resin molded product. The height of the side wall is set to a height suitable for accommodating the washer 14.
As shown in FIGS. 3 and 4, the bracket 15 containing the washer 14 is held by the lower rail 10 by snapping the pin 19 into the hole 21 in the base portion of the lower rail 10.
[0017]
As is apparent from FIG. 4, the center of the bolt insertion hole 16 of the washer 14 is easily aligned with the center of the hole 22 formed in the floor 3 by moving the washer 14 within the bracket 15 regardless of the center of the lower hole 9. obtain. Thus, the work of fixing the lower rail 10 to the floor 3 is easy, and the pitch error between the centers of the lower holes 9 at the front and rear portions of the lower rail 10 is absorbed by making the lower hole 9 having the maximum diameter that is allowable in design. This makes it easier to manufacture and design.
[0018]
The mounting of the bracket 15 to the base portion of the lower rail 10 is not performed in the process of assembling the lower rail 10 to the floor 3 but in the manufacturing process of the lower rail 10 before press molding, or at both ends of the lower rail 10 after press molding. Use an opening. Thus, the size of the bracket 15 and the washer 14 is not limited to the size of the gap between the flange portions of the lower rail 10, and may be a size corresponding to the size of the base portion. This serves to guarantee the lapping cost between the bolt head and the washer 14.
[0019]
The absorption of the pitch error of the pilot holes 9 drilled in the front and rear portions of the lower rail 10 has been described with reference to FIGS. 1 to 4, but as shown in FIG. 5, the pair of lower rails 10 and 10 spaced apart in the vehicle width direction is described. It is also possible to absorb dimensional errors. In this case, the center of the bolt 5 is shifted to one side in the vehicle width direction with respect to the center of the lower rail 10, but since the washer 14 is loosely moved with respect to the bracket 15, a dimensional error between the pair of lower rails 10, 10 is absorbed. become.
In other words, the combination of the bracket 15 and the washer 14 is such that the bolt 5 is screwed into the nut 6 fixed to the floor 3 in advance, the amount corresponding to the size of the lower hole 9 and the play of the washer 14 with respect to the bracket 15, the lower rail. 10 can be moved back and forth and left and right, and can absorb dimensional errors in the front and rear and right and left.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a vehicle seat slide device according to an example of the present invention.
FIG. 2 is a perspective view of a bracket, a washer, and a bolt.
FIG. 3 is a plan view showing a state in which a washer is housed in a bracket.
4 is a cross-sectional view as seen from the direction of arrows IV-IV in FIG. 3;
FIG. 5 is a cross-sectional view showing a state in which a dimensional error between a pair of lower rails is absorbed.
FIG. 6 is a cross-sectional view of a conventional example.
FIG. 7 is a perspective view showing a lower rail and an upper rail.
[Explanation of symbols]
3 Floor 5 Bolt 6 Nut 9 Lower hole 10 Lower rail 11 Body portion 12 Flange portion 14 Washer 15 Bracket 16 Bolt insertion hole 19 Pin 22 Floor hole

Claims (5)

In a seat slide device having a lower rail that holds an upper rail that holds a vehicle seat slidably in the front-rear direction of the vehicle and that is disposed on a floor of the vehicle,
A bracket 15 disposed on the lower rail 10;
A vehicular seat slide device comprising: a washer 14 movably held with respect to the bracket 15 in the bracket 15 . The vehicle seat slide device according to claim 1, wherein the bracket (15) has a box shape, the cover portion (17) has an opening (18), and the washer (14) has a square shape. The bolt 5 is screwed into the nut 6 fixed to the floor 3 through the opening 18 of the bracket 15, the bolt insertion hole 16 of the washer 14, and the lower hole 9 of the base portion of the lower rail 10, and the lower hole 9 is inserted through the bolt. 3. The vehicle seat slide device according to claim 2, wherein the seat slide device is larger than the hole 16 and the bolt head is seated on the washer. The vehicle seat slide device according to claim 3, wherein the bracket (15) has an arm (20) with a pin (19), and the pin (19) is snapped into the hole (21) in the base portion of the lower rail (10). The vehicle seat slide device according to claim 4, wherein the bracket and the washer are disposed on the front and rear portions of the base portion of the lower rail.

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