JPH02296543A - Seat slide device - Google Patents

Abstract

PURPOSE:To reduce the force to be loaded on a nut in a power seat slide device by projectingly providing an interference part engaging with a lead screw on the circumference of the lead screw through hole of a nut holder at deformation of a nut holder due to input to a seat belt fitting device. CONSTITUTION:In case of sliding a seat 1, a lead screw 6 is rotationally moved by driving a driving device 5. Hereby, an upper rail 2 is moved in the front of rear direction with the seat 1 guided with a lower rail 4, because a nut 9 threadedly engaged with the lead screw 6 is fixed in a nut holder 8. In such seat slide device, a backward inclinedly projected interference part 11 is provided on the upper end of a front wall part 52 forming a lead screw through hole 7. When the nut holder 8 is deformed due to the input to a seat belt fitting device 10, the interference part 11 is engaged with the lead screw 6 to reduce the force to be loaded on the nut 9.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a seat slide device that is used as a vehicle seat and is movable in the longitudinal direction of the vehicle. The present invention relates to a seat slide device that includes a seat slide and a device for attaching a seat belt to the seat.

In many cases, this method involves rotating a lead screw using an electric motor, and moving the seat using a nut screwed onto the lead screw.

[Conventional technology]

There are the following seat slide devices as described above (see Japanese Utility Model Application Publication No. 64-2634). For example, as shown in FIG.
A lower rail 24 as a floor side sliding member is attached and this upper rail 22 is fixed to a floor panel 23.
Installed slidably on the upper rail 22 inside the vehicle.
A drive device (not shown) is provided between the and lower rail 24.
The upper rail 22 is attached to the section 38, and the seat belt is attached by fixing the device 25. More specifically, this seat slide device has a structure as shown in FIG. Note that this figure shows the driving device, so the front and rear directions are switched from those in FIG. 7. In the same figure, 24 is a lower rail that is attached to the floor panel, 26 is attached to the lower rail 24 so as to protrude inward from the vehicle body, and a nut holder mounting portion 28, 29 is used to attach a nut holder 27, which will be described later, with a bolt 37.
2 shows a floor panel installation section in which this lower rail 24 is attached to a floor panel. Also, in the same figure,
Reference numeral 22 denotes an upper rail, which is fixed to the lower end of the seat (not shown), and which is inserted into the lower rail 24 as shown by arrow a and serves as a rolling member (a steel ball ( (not shown) so as to be slidable within the lower rail 24. Also, 30
The upper rail 22 is attached to the upper rail 22 via a drive device 31 composed of a DC motor and a speed reduction device and a rotary bearing device 32 such as a ball bearing using a lead screw, using bolts 35 and 36 at parts 33 and 34, respectively. Fixed. The nut holder 27 is this lead screw 30.
Holds a nut 42, which will be described later, and which is screwed into the nut 42. As shown in FIGS. 9 and 10, this nut holder 27 is a box-shaped member formed by bending and shaping a sheet metal, and has a lead screw insertion hole 40 and a nut insertion hole 41 formed therein. It has a structure in which expansion in the width direction is prevented by a bolt 44 for preventing expansion. The nut 42 is a rectangular parallelepiped member made of synthetic resin and has a female thread to be screwed into the lead screw 30 in order to prevent vibrations. The nut is inserted through the nut insertion hole 41 and screwed into the lead screw 30, and is mounted so as not to rotate even if the lead screw 30 rotates.

In such a seat slide device, in order to slide the seat 21, the drive device 31 is driven to rotate the lead screw 30. When the lead screw 30 is rotated, the nut 42 is fixed to the lower rail 24 via the nut holder 27. Since the nut holder attachment is fixed to the part 26, as the lead screw 30 is rotated, the upper rail 22 is guided by the lower rail 24 and the seat is moved. move back and forth with. Furthermore, if the lead screw 30 is rotated in the opposite direction, the sheet will move in the opposite direction accordingly.

[The problem that the idea aims to solve]

By the way, in the above-mentioned seat slide device, the seat belt is attached to the device 25, and the upper rail 22 is attached to the portion 3 so that the device 25 moves with the movement of the seat as described above.
8, in the event of a vehicle collision, the impact force F of the occupant received by the seat belt is applied to the mounting portion 38 of the upper rail 22, as shown in FIG. As a result, this force F is transmitted to the lead screw 30 as a force F°, as shown in FIG. 10, this force is transmitted to the nut 42, and finally from the nut holder 27 to the lower rail 2.
4. Transmitted to the floor panel. Therefore, especially for nuts made of resin, it is necessary to use particularly large nuts or to use high-strength and expensive resin in order to ensure strength to prevent damage.

However, as mentioned above, if the size of the nut is made large, the layout becomes difficult due to the increased size of the nut, and if resin with high strength is used, the price increases accordingly. There is.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a seat slide device that can obtain a predetermined strength as a whole without increasing the size of the nut even if the nut is made of resin with normal strength.

[Means to solve the problem]

The means for solving the above problems in this invention are as follows:
A seat-side slide member 2 provided on the seat 1, a floor-side slide member 4 provided on the floor panel 3, which holds the seat 1 movably in the longitudinal direction of the vehicle with the seat-side slide member 2, and a seat-side slide member. 2 and the floor-side sliding member 4; a lead screw 6 rotated by the driving means 5; a lead screw 6 fixed to the other of the seat-side sliding member 2 and the floor-side sliding member 4; A seat slide in which the seat 1 is moved back and forth by a nut 9 held in a nut holder 8 having a screw through hole 7 and screwed into the lead screw 6, and a device 10 is provided for attaching a seat belt to the seat side slide member 2. In the device, the seat belt is attached to the periphery of the lead screw through hole 7 of the nut holder 8 by input F to the device.
An interference portion 11 is provided in a protruding manner to engage with the lead screw 6 when the lead screw 6 is deformed.

[Effect]

According to the present invention, when there is an input to the seat belt attachment device 10, the force from the lead screw 6 is transmitted to the nut 9 via the seat side slide member 2.
As the force is transmitted to the nut 9', the nut holder 8 is elastically deformed, and the interference part 11 provided at the periphery of the lead screw through hole 7 engages with the lead screw 6, thereby reducing the force from the lead screw 6. is transmitted to the nut holder not only from the nut 9 but also from the interference part 11, the force to be borne by the nut 9 is reduced, and even if the size of the nut 9 is not particularly increased, a sufficient predetermined strength is generated as a whole.

〔Example〕

Embodiments of the seat slide device according to the present invention will be described below based on the drawings.

1 to 3 show a first embodiment of the present invention. The overall structure of the seat slide device in this embodiment is similar to the seat slide device shown as a conventional example, and has the structure as shown in FIG. In the same figure, 4
Reference numeral 12 indicates a lower rail attached to the floor panel 3, 12 is attached to the lower rail 4 so as to protrude toward the inside of the vehicle body, and a nut holder attachment portion is attached with a bolt 13 to which a nut holder 8, which will be described later, is attached. Further, in the same figure, reference numeral 2 denotes an upper rail, which is fixed to the lower end of the seat 1, and has steel balls (not shown) as rolling members inserted into the lower rail 4 and disposed within the lower rail. It is arranged to be slidable within the lower rail 4 via. Reference numeral 6 denotes a lead screw that connects the upper rail 2 to the upper rail 2 via a drive device 5 composed of a DC motor and a speed reducer, and a rotary bearing device (not shown) such as a ball bearing.
The respective attachments provided on the parts are fixed to the parts. A nut holder 8 holds a nut 9 which is screwed onto this lead screw 6.

In this embodiment, as shown in FIG. 3, the nut holder 8 is a box-shaped member formed by bending and shaping a sheet metal, and has a lead screw insertion hole 7 and a nut insertion hole 54. The structure is such that expansion in the width direction is prevented by the expansion prevention bolts 55. That is, the nut holder 8 includes a rectangular bottom wall 50 and both side walls 51 which are erected from both ends of the bottom wall 5o and have a nut insertion hole 54.
Two front walls 52 and two rear walls 53 extend from the front and rear ends of both side walls 51 along the front and rear edges of the bottom wall 5o.
It consists of. A gap is formed between these two front wall parts 52, and the gap is wide at approximately the center thereof, and a lead screw through hole 7 through which the lead screw 6 passes through is formed. The upper end of the front wall portion 52 forming the lead screw through hole 7 is provided with an interference portion 11 that projects rearward with an incline. Further, the rear wall portion 53 has a similar structure, but the interference portion 11.11' is provided at the lower end of the rear wall portion 53 forming the lead screw through hole 7 so as to be inclined forward. These interference parts 11 and 11' have dimensions such that when there is an input F to the seat belt, the nut holder attachment part 12 and the lead screw 6 come into contact when the nut holder 8 is deformed, as shown in FIG. There is. The deformation of these members is caused by the moment M generated by the distance H between the input F° from the lead screw 6 and the point of action of the input F' from the mounting portion 12 of the nut holder 8.

In this embodiment, a nut 9 is inserted into the nut holder 8 via an insulator 14, and the lead screw 6 is screwed into the nut 9 as shown in FIG.

Therefore, according to this embodiment, normal back and forth movement of the seat 1 can be performed by rotating the lead screw 6 using the drive device 5 as in the conventional case.

Furthermore, when the seat belt is attached, when there is an input to the part lO, the nut holder 8 is elastically deformed as shown in FIG.
1 engages with the lead screw 6, the force from the lead screw 6 is transmitted to the nut holder 8 not only from the nut 9 but also from the interference part 11, reducing the force that the nut 9 should bear.

Therefore, it is not necessary to increase the size of the nut 9 so much, and the overall strength can be maintained without using expensive materials.

FIG. 4 shows a second embodiment of the seat slide device according to the present invention. In this embodiment, the structure of the nut holder 60 is different from that in the first embodiment. In this embodiment, a rectangular bottom wall section 61, front and rear walls 63, 63' standing upright from the front and rear ends of the bottom wall section 61 and having a lead screw through hole 62 therein, and a bottom wall extending from both ends of these side walls. It consists of two right wall parts 64 and two left wall parts 65 extending along the side edge. These two right wall portions 64 are overlapped and joined approximately in the center, and a nut insertion hole 6 is provided in the center.
6 will be established. The upper end of the front wall portion 63 forming the lead screw through hole 62 is provided with an interference portion 67 that projects rearward with an inclination.

Further, the rear wall portion 63″ has a similar structure, but the interference portion 68 is located on the rear wall portion 63″ that forms the lead screw through hole.
” is provided at the lower end of the frame so as to be inclined forward.

Similarly, according to this embodiment, when there is an input to the seatbelt mounting section, the input is not only transferred from the lead screw 6 to the nut 9, but also the nut holder 60 is elastically deformed, so that the input is applied to the interference portion 67 on the periphery of the lead screw through hole.
．． 68 engages with the lead screw 6, and the force from the lead screw 6 is transmitted to the nut holder 60 not only from the nut 9 but also from the interference portions 67 and 68, reducing the force that the nut 9 should bear. .

5 and 6 show a third embodiment of the present invention. In this embodiment, the interference portions 71 and 72 of a nut holder 70 having substantially the same structure as the second embodiment described above are located at the front. The front wall 73 is provided toward the rear, and the rear wall 74 is provided toward the front, all around the lead screw through holes 75 and 76 in the wall 73 and the rear wall 74.

Similarly, in this embodiment, when an input is made to the seat belt attachment section 10, the nut holder 70 is elastically deformed, as shown by the broken line in FIG. 71 and 72 engage with the lead screw 6, and the force from the lead screw 6 is transmitted to the nut holder 70 not only from the nut 9 but also from the interference parts 71 and 72, reducing the force that the nut 9 should bear. becomes.

[Effect of idea]

As explained above, according to the present invention, when an input is made to the seatbelt installation part, the nut holder is elastically deformed, and the interference part on the periphery of the lead screw through hole engages with the lead screw, causing the lead screw to tighten. The force from the nut is transmitted to the nut holder not only from the nut but also from the interference portion, reducing the force that the nut must bear. Therefore, the size of the nut does not need to be very large, and the overall strength can be maintained without using expensive materials. Additionally, since the size of the nut can be made smaller, the size of the nut holder can be made smaller, and the thickness of the butt of the seat cushion can be increased, resulting in improved sitting comfort. .

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a partially cutaway sectional view showing a first embodiment of the present invention;
Fig. 2 is a sectional view showing the behavior of the seat slide device shown in Fig. 1 when a load is input, Fig. 3 is a perspective view showing the nut holder of the seat slide device shown in Fig. 1, and Fig. 4 is the present invention. FIG. 5 is a sectional view showing a second embodiment of the seat slide device according to the present invention, and FIG.
6 is a sectional view showing the seat slide device shown in FIG. 5, FIGS. 7 and 8 are perspective views of the seat slide device to which the present invention is applied, and FIG. 9 is a sectional view showing an embodiment of the present invention. 10 is a perspective view showing a nut and a nut holder of a conventional seat slide device, and FIG. 10 is a sectional view taken along the line X--X in FIG. 9 showing the conventional nut holder. 1... Seat 2... Seat side slide member (upper rail) 3...
・Floor panel 4...Floor side sliding member (lower rail) 5...
Drive device 6...Lead screw 7...Lead screw through hole 8...Nut holder 9...Nut 10...Seat belt installation is done by device 11...Interference part diagram diagram whistle diagram diagram diagram Zusho Neho Seisho (Method) September 28, 1999

Claims (1)

[Claims] A seat-side slide member (2) provided on the seat (1);
a floor-side slide member (4) provided on the floor panel (3), which holds the seat (1) movably in the longitudinal direction of the vehicle with the seat-side slide member (2); a seat-side slide member (2); A driving means (5) disposed on one side of the floor-side sliding member (4) and this driving means (5)
A lead screw (6) rotated by a nut holder (8) fixed to the other of the seat-side sliding member (2) and the floor-side sliding member (4) and having a lead screw through hole (7) A seat slide device which moves the seat (1) back and forth by a nut (9) screwed onto the lead screw (6) and is provided with a seat belt attachment device (10) on the seat side slide member (2). , the lead screw through hole (7) of the nut holder (8).
) is characterized in that an interference part (11) is protrudingly provided on the periphery of the seat belt attachment device to engage with the lead screw (6) when the nut holder (8) is deformed by the input (F) to the seat belt attachment device. seat sliding device