JP2002254968A - Rotation device for vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength of the whole rotation device and reduce its weight. SOLUTION: A plurality of lower plate pieces 2 are provided at a predetermined interval in the peripheral direction of a ringlike upper plate 1. The lower plate pieces 2 holding a ball 6 at an interval in the peripheral direction by a ringlike ball holding member are positioned inside and outside of a ball receive part 23 at a tip of the lower plate piece 2 bent greatly in the opposing direction to hold the ball receive part 23 from an inner peripheral side by the upper plate 1 and a set plate 8 through these balls 6 and support the upper plate 1 by the lower plate pieces 2 so as to rotate freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating device for a vehicle seat, and more particularly to an improvement in the structure thereof.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional rotating device. The rotating device is composed of a lower plate 81 fixed on a seat leg on the vehicle floor side, and an upper plate 82 located above and on which the vehicle seat is mounted and fixed. The lower plate 81 and the upper plate 82 are ring-shaped members having a substantially rectangular outer shape with a circular opening formed at the center. The four corners 821 of the upper plate 82 are bent outward and extended, and a sheet Bolts 822 for fixing the frame are provided upright.

The details of the rotating device will be described with reference to FIG.
Rises stepwise, and the inner peripheral portion 813 further rises stepwise from the intermediate portion 812. The inner peripheral portion 831 of the ring-shaped set plate 83 is fixed to the upper surface of the inner peripheral portion 813 of the lower plate 81. The upper plate 82 has an inner peripheral portion 824 descending stepwise from an outer peripheral portion 823 to lower plate intermediate portion 812 and set plate 8.
3 has entered the space between. A part of the plate surface of the middle portion 812 of the lower plate 81 is annularly recessed to form a ball holding groove 81a.
A number of balls 6 are arranged at intervals in the circumferential direction between the inner peripheral portion 824 and a ball holding groove 82a formed in a ring shape on the plate surface. Further, between the ball holding groove 83a formed annularly in the plate surface of the set plate 83 and the ball holding groove 82b annularly formed in the plate surface of the inner peripheral portion 824 of the upper plate 82 opposed thereto. A large number of balls 6 are arranged at intervals in the circumferential direction, and the inner peripheral portion 824 of the upper plate 82 is rotatable between the intermediate portion 812 of the lower plate 81 and the set plate 83 via these balls 6. Embraced by

A hook plate 91 having a predetermined width is joined to the lower surface of the corner portion 821 of the upper plate 82. The hook plate 91 extends downward along the lower surface of the corner portion 821 so that the tip 911 has a U-shape. It is bent. On the other hand, a hook plate 92 is provided on the outer peripheral portion 811 of the lower plate 81 at a position corresponding to the hook plate 91, and a tip 921 of the hook plate 92 is bent in an inverted U-shape to form a tip of the hook plate 91. 911 with a predetermined gap. These hook plates 91,
Reference numeral 92 indicates that the upper plate 82 engages with each other when a force for lifting the upper plate 82 is applied from the vehicle seat, thereby restricting the upper plate 82 from being excessively separated from the lower plate 81.

In FIG. 5, an operating lever 84 which is bent in an L-shape in plan view is provided on the upper plate 82, and a base end 841 is rotatably supported by a bracket 85. As shown, a base end of a locking piece 86 bent in an L-shape is joined to the peripheral surface of the base end portion 841, and the front end of the locking piece 86 passes through a locking hole 832 of the set plate 83 to lock the upper plate 82. The rotation of the upper plate 82 is restricted by being inserted into the hole 825. When rotating the upper plate 82,
The operation lever 84 opposes the spring force of the spring member 87 (FIG. 5).
Is rotated to release the locking piece 86 from the locking hole 825. By rotating the upper plate 82 by 180 degrees, the locking piece 86 of the operation lever base end 841 is set to the set plate 83.
By inserting the upper plate 82 into another locking hole (not shown) through the locking hole 833 (FIG. 5), the sheet can be positioned at the front-back inverted position.

[0006]

However, in the above-mentioned conventional rotating device, the interval between the upper plate 1 and the lower plate 2 is required to be at least a certain value in order to dispose the hook plates 91 and 92. The lower plate 81 is moved from the outer peripheral portion 811 to the intermediate portion 812 and the inner peripheral portion 81.
3 or the ring-shaped upper plate 82 must be lowered stepwise from the outer peripheral portion 823 to the inner peripheral portion 824. In order to realize such a shape, usually, deep drawing of a press is used. Therefore, usable plate materials are limited to those having large extensibility. There is a problem that the weight cannot be reduced by further improving the strength of the device or reducing the plate thickness.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicle seat rotating device capable of improving the strength and reducing the weight of the entire device.

[0008]

According to the present invention, an upper plate (1) fixed to a seat member (53) of a vehicle and a floor member (5) of the vehicle are provided. And a lower plate (2) fixed to the vehicle seat rotatably arranged via a friction reducing member (6) so that one of the upper plate (1) and the lower plate (2) can be rotated. Is formed into a ring shape, and the other of the upper plate (1) and the lower plate (2) is constituted by a plurality of plate pieces provided at predetermined intervals in the relative rotation direction. Here, as the friction reducing member, a ring-shaped member arranged along the ring-shaped upper plate (1) or lower plate (2) can be suitably used. For example, a ring-shaped ball holding member can be used. A member in which a ball (6) is held at an interval in the circumferential direction on a member (61) can be used.

According to the present invention, since the other of the upper plate and the lower plate is constituted by a plurality of plate pieces positioned in the direction of relative rotation of these plates, it is possible to use a conventional ring-shaped plate. Thus, the weight of the device can be reduced. Further, since the plate piece having a predetermined width can be largely raised toward the opposed upper plate or lower plate without performing deep drawing, the drawing of the ring-shaped upper plate or lower plate can be made sufficiently shallow. . As a result, since the plate piece and the upper plate or the lower plate can be manufactured using a steel sheet having higher tensile strength without performing deep drawing, the strength of the rotating device can be improved and the thickness can be reduced. Further weight reduction can be realized.

[0010] The reference numerals in parentheses indicate the correspondence with specific means described in the embodiment described later.

[0011]

FIG. 1 shows the appearance of a rotating device. The rotating device includes an upper plate 1 having a rectangular outer shape, and the upper plate 1 is a ring-shaped member having a circular opening 11 formed in the center. Bolts 121 for fixing the seat frame 53 are provided upright on the upper surface of each corner 12 on the upper plate 1, and an engagement member 4, which will be described in detail later, is provided on the lower surface of the plate near each bolt 121. ing.

A lower plate piece 2 is provided on each corner upper surface of the top plate of the quadrangular seat leg 5 below each engaging member 4, and each leg 51 of the seat leg 5 is provided.
Are supported on a slide rail 52 provided on the vehicle floor. The details of the lower plate piece 2 are shown in FIG. The lower plate piece 2 is formed by bending a plate body having a predetermined width, and has a base 21 joined to the top surface of the seat leg 5, a wall 22 rising from one end thereof at a substantially right angle, and an upper end of the wall 22. And a ball receiving portion 23 formed at the bottom. The ball receiving portion 23 has the circular opening 11 (FIG. 1) in plan view.
Are formed in a substantially Z-shape in side view, and ball guide surfaces 23a and 23b are formed inside and outside the vertical wall 231 as a boundary. Then, a large number of balls 6 rotatably held on a ring-shaped ball holding plate 61 as shown in FIG. 3 at intervals in the circumferential direction pass over such ball guide surfaces 23a and 23b. (Only the ball guide surface 23a side is indicated by a chain line in FIG. 2).

An engaging member 7 is provided on the base 21 of the lower plate 2 as shown in FIG. The engagement member 7 is formed by bending a plate body into a substantially inverted U-shape, and its open edge is opened horizontally to form fixing flanges 71 and 72, which are joined to the base 21 plate surface. The main body 73 of the engaging member 7 has an engaging portion 731 horizontally projecting from the top in the outer peripheral direction.
Is formed, and its cross section is substantially inverted U-shaped. On the other hand, the upper plate 1 is provided with the engaging members 4 on the lower surface of each corner portion 12 as described above, and these engaging members 4 are connected to the engaging members 7 as shown by the chain lines in FIG. The engaging portion 431 having a substantially U-shaped cross-section extending horizontally in the inner circumferential direction has an open edge end surface of an open edge end surface of the engagement portion 731 of the engagement member 7. At a predetermined gap.

FIG. 4 shows the positional relationship between the upper plate 1 and the lower plate piece 2. In the upper plate 1, an intermediate portion 15 between the outer peripheral portion 13 and the inner peripheral portion 14 is slightly bent and depressed, and the depressed surface serves as a ball receiving surface 1a. A ring-shaped set plate 3 is connected to the lower surface of the inner peripheral portion 14 of the upper plate 1, and the outer peripheral portion 31 of the set plate 3 is bent slightly downward and then extends horizontally, and the upper surface of the horizontal portion receives the ball. Surface 3a.
A ball receiving portion 23 formed at the tip of the wall portion 22 of the lower plate piece 2 rising significantly toward the upper plate 1
Are the middle part 15 of the upper plate 1 and the set plate 3
Between the ball receiving surfaces 1a and 3a of the upper plate 1 and the set plate 3;
The ball 6 held by the above-described ball holding plate 61 (FIG. 3) is located between the ball receiving surfaces 23a and 23b of the ball receiving portion 23. As described above, the balls 6 are positioned diagonally inside and outside the vertical wall 231 of the ball receiving portion 23 of the lower plate piece 2, and the ball receiving portion 23 is interposed between the balls 6 so that the ball receiving portion 23 is connected to the upper plate 1 and the set plate 3.
The upper plate 1 is rotatably supported by holding the upper plate 1 from the inner peripheral side. The rotation of the upper plate 1 is regulated, for example, by a locking hole (not shown) provided on the set plate 3 by a locking piece of an operation lever (not shown) provided on the upper plate 1 as described in the related art. Through a hole inserted into a locking hole (not shown) of the lower plate piece 2. When a force for lifting the upper plate 1 is applied from the vehicle seat, the open edge end surfaces of the engaging portions 431 and 731 of the engaging members 4 and 7 facing each other at the up and down positions are brought into abutting engagement with each other. The upper plate 1 is restricted from being excessively separated from the lower plate piece 2.

According to the rotating device of the present embodiment, the lower plate piece 2 is formed by bending a plate body having a predetermined width and provided at only four corners on the top surface of the seat leg 5. The weight of the apparatus can be reduced as compared with the case of using a lower plate having a shape. Further, the wall portion 22 of the lower plate piece 2 having a predetermined width can be largely raised without performing deep drawing, and the drawing of the ring-shaped upper plate 1 can be made sufficiently shallow. Therefore, both the lower plate piece 2 and the upper plate 1 can be manufactured using a higher tensile strength steel plate, and the strength of the rotating device can be improved and the weight can be further reduced by reducing the thickness. it can. Further, since the engaging members 4 and 7 are disposed near the bolts 121 for fixing the seat frame 3, the seat lifting force is directly received by the engaging members 4 and 7, and an excessive load acts on the upper plate 1. There is no deformation of the lever. Furthermore, lower plate piece 2
The ball 6 is positioned diagonally inward and outward with the vertical wall 231 of the ball receiving portion 23 interposed therebetween, so that the planar area required for holding the ball 6 is smaller than in the related art (see FIG. 6), Opening 11 is enlarged to make upper plate 1
Can also be reduced in weight.

In the above embodiment, the places where the lower plate pieces 2 are installed are not limited to four places. Further, the lower plate may have a ring shape, and the upper plate may be an upper plate piece separated from each other. Further, the distal end ball receiving portion of the lower plate piece or the upper plate piece may be held by the set plate from the outer peripheral side. Instead of using the set plate, the inner peripheral edge or the outer peripheral edge of the lower plate or the upper plate may be bent to hold the plate piece. Further, instead of the friction reducing member of the above embodiment in which a large number of balls are held on a ring-shaped ball holding plate, for example, a resin ring having good slidability can be used.

[0017]

As described above, according to the vehicular seat rotating apparatus of the present invention, it is possible to improve the strength and reduce the weight of the entire apparatus.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a rotating device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a lower plate piece.

FIG. 3 is a partial perspective view of a ball holding plate.

FIG. 4 is a vertical sectional view of a main part of the rotating device.

FIG. 5 is an overall perspective view of a conventional rotating device.

FIG. 6 is a vertical sectional view of a main part of the rotating device.

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper plate, 2 ... Lower plate piece, 5 ... Seat leg, 53 ... Seat frame, 6 ... Ball, 61 ... Ball holding plate.

Claims (2)

[Claims] 1. A vehicle comprising: an upper plate fixed to a sheet-side member of a vehicle; and a lower plate fixed to a floor-side member of the vehicle, which are relatively rotatable via a friction reducing member. In the sheet rotating device, one of the upper plate and the lower plate is formed into a ring shape, and the other of the upper plate and the lower plate is formed of a plurality of plate pieces provided at predetermined intervals in the relative rotation direction. A rotating device for a vehicle seat, wherein the rotating device is configured. 2. The vehicle seat rotating device according to claim 1, wherein the friction reducing member is a ring-shaped member disposed along the ring-shaped upper plate or lower plate.