JP2006168419A - Seat for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat with a cushioning property corresponding to a physical constitution of an occupant for minimizing all of a mounting space and an actuating space of a buffer device, and being stably actuated. <P>SOLUTION: In this seat for a vehicle, front parts on both of right and left sides of a seat frame 3 are rotatably mounted to a front part of a base frame 8 by a front upper mounting shaft 10, and both of rear right and left sides of the seat frame 3 are mounted to a rear part of the base frame 8 via a link mechanism 13. One end of the buffer device 12 is mounted to the link mechanism 13, and the other end of the buffer device 12 is mounted to the front part of the base frame 8. The buffer device 12 comprises a viscous body damper 18 for attenuation consisting of viscous fluid having a property for increasing viscosity in proportion to traveling speed or viscoelastic body D, and a compression spring element 19 supporting a load. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a vehicle seat, and is particularly devised for the configuration of a seat that can be omitted of a spring material such as a zigzag spring or a cushion material.

In the conventional well-known vehicle seat, a spring material such as a zigzag spring is hung on the upper surface of the seat frame, and a cushion material is placed on the upper surface of the spring material. It is the structure which absorbs (attenuates) the impact of a direction (for example, patent document 1).
Japanese Patent Laid-Open No. 10-129322

In the known example, the vehicle seat is moved up and down by the link and the shock is absorbed by the shock absorber and converged. The spring and the damper are simply provided between the vehicle seat and the vehicle body.
Therefore, there is a problem that a structure for incorporating a spring and a damper into a normal seat is complicated, and the upper and lower thicknesses of the seat are increased.
The present application provides a seat that reduces the size of both the mounting space and the working space of the shock absorber and that can operate stably and that exhibits cushioning according to the physique of the seated person. It is.

In the present invention, the front side portions of the left and right sides of the seat frame 3 of the seat seat 2 are arranged on the front upper mounting shaft on the front side portion of the base frame 8 that is fixed with respect to the vehicle body or that can be moved and adjusted in an arbitrary direction. 10, the seat frame 3 is configured such that its rear part moves up and down around the center of the front upper mounting shaft 10, and the right and left rear sides of the seat frame 3 are linked to the rear part of the base frame 8. One end of the shock absorber 12 is attached to the link mechanism 13, and the other end of the shock absorber 12 is attached to the front portion of the base frame 8. The shock absorber 12 has a viscosity proportional to the moving speed. A vehicular seat constituted by a viscous damper 18 for damping constituted by a viscous fluid or a viscous elastic body D having high properties and a compression spring body 19 for supporting a load; Those were.
In the present invention, the link mechanism 13 has one end of a link rod 14 formed in a bell crank shape pivotally attached to the rear portion of the seat frame 3, and the intermediate portion of the link rod 14 is pivoted to the rear portion of the base frame 8. The other end of the link rod 14 is pivotally attached to one end of the shock absorber 12, and the other end of the shock absorber 12 is a vehicle seat attached to the front portion of the base frame 8.
According to the present invention, the shock absorber 12 is configured by providing a compression spring body 19 that supports a load on the outer periphery of a viscous damper 18 that dampens vibrations formed by enclosing a viscous fluid or a viscous elastic body D. The damper 18 is divided into one side member 20 and the other side member 21, and the compression spring body 19 is provided between the one side member 20 and the other side member 21, and the elasticity of the compression spring body 19 is adjustable. The vehicle seat is configured.
According to the present invention, the shock absorber 12 is formed in the central shaft portion 24 by providing the cylinder chamber 22 in the one side member 20 and the rod portion 23 in the other side member 21 and inserting the rod portion 23 in the cylinder chamber 22. The compression spring body 19 is provided between the spring receiving portions 27 formed on the one side member 20 and the other side member 21 on the outer periphery of the central shaft portion 24, and the other side member 21 is attached to the rod portion 23. This is a vehicle seat that is screwed in a freely rotatable manner.

According to the first aspect of the present invention, the link mechanism 13 converts the vertical vibration direction of the seat frame 3 in accordance with the expansion / contraction direction of the shock absorber 12 so that the initial setting of the shock absorber 12 can be easily adjusted. Stabilize operation and improve seating feeling.
According to the second aspect of the present invention, both the mounting space and the operating space of the shock absorber 12 can be reduced in size, and can be operated stably.
In invention of Claim 3, the sheet | seat which exhibits the cushioning property according to the seated person's physique can be provided.
In the invention of claim 4, the elasticity adjusting mechanism of the compression spring body 19 can be configured easily.

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a vehicle seat, 2 a seat seat of the vehicle seat 1, 3 a seat frame, and 6 a backrest seat.
The seat frame 3 is provided with front mounting portions 7 on both left and right sides of the front lower surface, and each front mounting portion 7 is connected to a pair of left and right front support fixing portions 9 of a base frame 8 mounted on a vehicle body or a slide rail. 10 is attached so as to rotate around the front upper attachment shaft 10.
Therefore, the rear portion of the seat frame 3 is rotated up and down around the front upper mounting shaft 10.
Rear attachment portions 11 are provided on both left and right sides of the rear lower surface of the seat frame 3, and the rear portion of the shock absorber 12 is attached to the rear attachment portion 11 via a link mechanism 13.

The link mechanism 13 has one end (lower end) of a link rod 14 formed in a bell crank shape attached to the rear portion of the shock absorber 12 by a shaft 15, and an intermediate portion of the link rod 14 is supported by a pair of left and right rear sides of the base frame 8. The fixed portion 16 is rotatably attached by a shaft 17, and the other end (upper end) of the link rod 14 is pivotally attached to the seat frame 3 by a shaft 31.
The front portion of the shock absorber 12 is attached to the front support fixing portion 9 by a shaft 32.
The shock absorber 12 is configured by providing a compression spring body 19 that supports a load on the outer periphery of a viscous damper 18 that dampens vibrations formed by enclosing a viscous fluid or a viscous elastic body D.

This viscous damper 18 is divided into one side member 20 and the other side member 21, and a cylinder chamber 22 is provided in either one, a rod portion 23 is provided in either one, and the rod portion 23 is inserted into the cylinder chamber 22. Then, a compression spring body 19 is provided on the outer periphery of the central shaft portion 24 (FIG. 5).
The cylinder chamber 22 is filled with a viscous fluid or a viscous elastic body D (for convenience of drawing, the same part is illustrated by reference numerals 22 and D in FIG. 5), and the viscous fluid or the viscous elastic body D is contained therein. The rod part 23 is inserted. The distal end side of the rod portion 23 is inserted from one side of the insertion hole 25 provided in the one side member 20 or the other side member 21, and the stopper 26 for retaining is screwed to the distal end of the rod portion 23 from the other side of the insertion hole 25. Let me install.

27 is a spring receiving portion formed on each of the one side member 20 and the other side member 21, and the compression spring body 19 is disposed between the pair of spring receiving portions 27.
Therefore, the central shaft portion 24 and the spring receiving portion 27 of the viscous damper 18 of the shock absorber 12 also function as a regulating member that regulates the expansion / contraction direction of the compression spring body 19.
28 is a cylinder member that forms the cylinder chamber 22, 29 is a plug member that closes the cylinder member 28, and 30 is a seal member.

  The viscous damper 18 dampens vibrations due to the contact resistance between the viscous fluid or viscous elastic body D in the cylinder chamber 22 and the rod portion 23 (viscous fluid due to sliding of the rod portion 23 or shear resistance of the viscous elastic body D). The viscous fluid or the viscous elastic body D has a property of increasing the viscosity in proportion to the moving speed of the rod portion 23. When the rear portion of the seat frame 3 is vibrated greatly, the viscosity increases and the damping force increases. When the vibration of the rear part of the seat frame 3 is small, the viscosity becomes low and the damping force is also small, and the vertical vibration of the rear part of the seat frame 3 is converged substantially uniformly regardless of the magnitude of the vibration, Improve the feeling.

  FIG. 6 shows the damping characteristic of the viscous damper 18 of the present application. The damping characteristic of the viscous damper 18 is indicated as “D”, and the damping characteristic of the urethane foam used for the cushion material is indicated as “U”. Thus, the viscous damper 18 has substantially the same damping characteristics as urethane foam, and the cushioning material can be omitted or made very thin as will be described later.

Thus, either one of the one side member 20 and the other side member 21 is configured to be movable with respect to the other, and the elasticity of the compression spring body 19 is configured to be adjustable.
That is, the elasticity of the compression spring body 19 can be adjusted according to the weight of the seated person to improve the seating feeling of the seated person. When the distance between the one side member 20 and the other side member 21 is widened, the compression spring body When the distance between the one side member 20 and the other side member 21 is reduced, the compression spring body 19 is reduced and the elasticity is increased.

  In the embodiment, the other side member 21 is rotatably threadedly engaged with the screw shaft portion 34 of the rod portion 23, and the operation groove 35 is formed on the outer periphery of the adjustment operation spring receiving portion 27 </ b> A of the other side member 21. The spring receiving portion 27A is also used as an adjustment operation member. Normally, the rod portion 23 moves integrally with the other side member 21 with respect to the one side member 20, and the other side member 21 is moved with respect to the rod portion 23. It is configured to be movable in the axial direction by rotating.

An operation groove 35 is formed on the outer periphery of the adjustment operation spring receiving portion 27A of the other side member 21, and the spring reception portion 27 is also used as an adjustment operation member. The operation groove 35 may be formed to an arbitrary depth by knurling or the like so that it can be manually operated in accordance with the operation resistance of the adjustment operation spring receiver 27A.
Reference numeral 36 denotes a stopper nut for stopping the other side member 21.
In FIG. 5, for easy understanding, the stopper 26 for retaining is separated from the inner bottom surface 25 </ b> A of the insertion hole 25, but normally, the rod portion 23 is moved by the elasticity of the compression spring body 19 to be detached. Stop stopper 26 is in contact with back bottom surface 25A.

(Operation of Example)
The seat 2 includes a front mounting portion 7 of a plate-like seat frame 3 that is rotatably attached to a front support fixing portion 9 by a front upper mounting shaft 10. Since the rear part is pivotably attached via the link mechanism 13 and the front part of the shock absorber 12 is pivotally attached to the base frame 8, the compression spring body 19 of the shock absorber 12 extends, so that the seat frame 3 is positioned at a predetermined height (FIGS. 2 and 3).

That is, when the compression spring body 19 is extended, the compression spring body 19 acts so that the one side member 20 and the other side member 21 are separated from each other, and the stopper 26 for retaining the rod portion 23 is placed on the bottom surface 25A of the insertion hole 25. The viscous damper 18 is kept in contact with the initial position.
Since the shock absorber 12 includes the viscous damper 18 and the compression spring body 19, when the rear portion of the seat frame 3 moves downward, the damper 12 is elastically supported by the action of the viscous damper 18 and the compression spring body 19.

When the rear part of the seat frame 3 moves downward, the compression spring body 19 always acts in the contracting direction, so that the load of the seat frame 3 is elastically supported to provide a cushioning action, and the viscous damper 18 is expanded and contracted. Since the operation is performed so as to attenuate the force in both directions, the expansion and contraction of the compression spring body 19 is converged.
That is, conventionally, since a large load is elastically supported by a spring material such as a zigzag spring and fine vibrations are damped by the cushion material 4, the cushion material 4 having a predetermined thickness that can attenuate the fine vibrations is necessary. It was.

The cushion material 4 having a predetermined thickness can attenuate fine vibrations but cannot support a large load. Therefore, a spring material is required between the cushion material 4 and the seat frame 3, and therefore the spring material is moved up and down. A possible upper and lower space for amplitude is also required, which is a factor for increasing the thickness of the seat 2 as it is.
However, in this application, since the load can be supported by the shock absorber 12, the spring material for attaching the cushion material 4 to the seat frame 3 can be omitted, and the thickness of the seat 2 can be reduced accordingly.

  In addition, the conventional cushion material 4 requires a predetermined thickness in order to attenuate vibrations. However, the thickness of the cushion material 4 of the present application does not consider the damping efficiency of the cushion material 4 and The thickness may be set to a thickness that suppresses the feeling of contact between the heel and the seat frame 3, and the seat seat 2 that is thinner than the conventional seat seat 2 can be provided.

  The viscous damper 18 is composed of a viscous fluid or a viscous elastic body D having a property that the viscosity increases in proportion to the speed. The viscosity increases and the damping force increases, and when the vibration of the rear part of the seat frame 3 is small, the viscosity decreases and the damping force also decreases, so that the seat frame 3 is substantially constant regardless of the magnitude of the vibration. The vertical movement of the rear part is converged and the seating feeling is improved.

In this case, as shown in FIG. 6, the damping characteristic of the viscous damper 18 of the present application exhibits substantially the same damping characteristic as that of the urethane foam used for the cushioning material. It can be omitted.
Therefore, even if the cushion material 4 and the skin member 5 are provided, they may be used to improve the tactile sensation such as the so-called texture.

  Thus, the front mounting portion 7 of the seat frame 3 is rotatably mounted on the front support fixing portion 9 of the base frame 8 by the front upper mounting shaft 10, and the rear mounting portion 11 of the seat frame 3 is connected via the link mechanism 13. The rear end of the link mechanism 13 is pivotally attached to the rear support fixing portion 16, and one end of the link rod 14 of the link mechanism 13 is pivotally attached to the shock absorber 12 by the shaft 15, and the intermediate portion of the link rod 14 is supported at the rear side of the base frame 8. Since the rear end of the shock absorber 12 is pivotally attached to the portion 16 by the shaft 17 and the other end of the link rod 14 is pivoted, the seat frame 3 is around the axis of the front upper attachment shaft 10 of the front attachment portion 7. When the rear part of the seat frame 3 is turned up and down around the front upper mounting shaft 10, the link mechanism 13 converts the up and down movement into a back and forth movement to expand and contract the shock absorber 12 and attenuate the vibration. .

Therefore, the shock absorber 12 is always expanded and contracted by the link mechanism 13 so as to coincide with the axial direction, the damping force is made constant, and the seating feeling is improved.
That is, when the shock absorber 12 is directly attached to the seat frame 3, the initial height of the seat frame 3 before sitting is displaced by the weight of the seated person, and the vibration direction of the seat frame 3 is up and down. The expansion and contraction directions of the shock absorber 12 do not coincide with each other, and the damping force slightly changes depending on the weight of the seated person, but the present application suppresses this.

Since the shock absorber 12 is configured to be able to adjust the elasticity of the compression spring body 19, the seating feeling is improved by adjusting the elasticity of the compression spring body 19 in accordance with the difference in the physique of the seated person. Let
That is, if the elasticity of the compression spring body 19 is constant, a heavy seated person can not support the weight and has a feeling of bottoming, and a light seated person will be flipped up. Although it is uncomfortable due to the riding comfort such as “dancing”, by making the elasticity of the compression spring body 19 correspond to the seated person, the cushioning property by the compression spring body 19 is improved and the seating feeling is improved.

In the embodiment, one of the one side member 20 and the other side member 21 of the shock absorber 12 is configured to be movable with respect to the other, so that the elasticity of the compression spring body 19 can be adjusted. Therefore, the elasticity adjustment of the compression spring body 19 is realized with a very simple configuration.
Specifically, the other side member 21 and the rod portion 23 are screwed together so as to be movable, and an operation groove 35 is formed on the outer periphery of the adjustment operation spring receiving portion 27A of the other side member 21. Therefore, when the adjustment operation spring receiving portion 27A of the other side member 21 is turned in one direction, the space between the one side member 20 and the other side member 21 is widened, and the elasticity of the compression spring body 19 is weakened. When the adjustment operation spring receiving portion 27A of the member 21 is turned in the other direction, the interval between the one side member 20 and the other side member 21 is narrowed, the compression spring body 19 is reduced, and the elasticity is increased.

  If the stopper nut 36 is applied to the adjustment operation spring receiving portion 27A after adjustment by the adjustment operation spring receiving portion 27A of the other side member 21, the movement of the other side member 21 is fixed.

FIG. The side view of the shock absorber before seating. The operation state side view of a shock absorber. The side view of a shock absorber. Sectional drawing of a shock absorber. Explanatory drawing of a damping characteristic of a viscous body damper.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Seat seat, 3 ... Seat frame, 4 ... Cushion material, 5 ... Skin member, 7 ... Front side attaching part, 8 ... Base frame, 9 ... Front side supporting fixing part, 10 ... Front side attaching shaft, DESCRIPTION OF SYMBOLS 11 ... Rear side attachment part, 12 ... Shock absorber, 13 ... Link mechanism, 14 ... Link rod, 15 ... Shaft, 16 ... Rear side support fixing part, 17 ... Shaft, 18 ... Viscous damper, 19 ... Compression spring body, DESCRIPTION OF SYMBOLS 20 ... One side member, 21 ... Other side member, 22 ... Cylinder chamber, 23 ... Rod part, 24 ... Center shaft part, 25 ... Insertion hole, 26 ... Stop stopper, 27 ... Spring receiving part, 27A ... Adjustment operation Spring receiving portion, 28 ... cylindrical member, 29 ... plug member, 30 ... sealing member, 35 ... operating groove, 36 ... stopper nut.

Claims (4)

The front part of the left and right sides of the seat frame 3 of the seat seat 2 can be freely rotated by the front upper mounting shaft 10 on the front part of the base frame 8 which is fixed to the vehicle body or is attached so as to be movable and adjustable in any direction. The seat frame 3 is configured such that its rear part moves up and down about the front upper mounting shaft 10, and the rear sides of the left and right sides of the seat frame 3 are attached to the rear part of the base frame 8 via the link mechanism 13. One end of the shock absorber 12 is attached to the link mechanism 13, and the other end of the shock absorber 12 is attached to the front portion of the base frame 8, and the shock absorber 12 has a property that the viscosity increases in proportion to the moving speed. A vehicular seat constituted by a damping viscous damper 18 constituted by a viscous fluid or a viscous elastic body D and a compression spring body 19 supporting a load. 2. The link mechanism according to claim 1, wherein one end of a link rod formed in a bell crank shape is pivotally attached to a rear portion of the seat frame, and an intermediate portion of the link rod is attached to a rear portion of the base frame. The vehicle seat is attached to the shaft, the other end of the link rod 14 is attached to one end of the shock absorber 12, and the other end of the shock absorber 12 is attached to the front portion of the base frame 8. 3. The shock absorber 12 according to claim 1, wherein the shock absorber 12 is provided with a compression spring body 19 for supporting a load on an outer periphery of a viscous body damper 18 for damping a vibration formed by enclosing the viscous fluid or the viscous elastic body D. The viscous damper 18 is divided into one side member 20 and the other side member 21, and the compression spring body 19 is provided between the one side member 20 and the other side member 21. A vehicle seat with adjustable elasticity. In claim 3, the shock absorber 12 is provided with a cylinder chamber 22 on one side member 20 and a rod portion 23 on the other side member 21, and the rod portion 23 is inserted into the cylinder chamber 22 to be connected to the central shaft portion 24. The compression spring body 19 is provided between the spring receiving portions 27 formed on the one side member 20 and the other side member 21 on the outer periphery of the central shaft portion 24, and the other side member 21 is attached to the rod portion 23. A vehicle seat that is screwed in a rotatable manner.

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