JPH07236539A - Seat cushioning structure for front seat - Google Patents

Abstract

PURPOSE:To improve the thigh supporting performance of a crew by increasing a stabilizing effect on the front terminal side of a supporting panel. CONSTITUTION:A urethane pad 106 is interposed between both corner parts on the front terminal side of a cushion panel 30 and that on the front terminal side of a cushion frame 32. Since the resilient force of the urethane pad 106 functions on the cushion panel 30 in corner turn, etc., even when an inertia force in a seat width direction is applied to the crew, the stabilizing effect can be obtained. In this way, the thigh support performance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat cushion structure for a front seat.

[0002]

2. Description of the Related Art Conventionally, various measures have been taken in order to improve a sitting feeling when an occupant sits on a front seat of a vehicle. The applicant of the present invention has already devised a seat cushion structure for a front seat that has been devised in this manner (for example, Japanese Patent Application No. 4-606).
92). Hereinafter, the seat cushion structure of the front seat according to this application (to be precise, the structure corresponding to the third embodiment of the application) will be described.

As shown in FIG. 19, a seat cushion 300 of this front seat has a frame-shaped cushion frame 302, a cushion panel 304 having a predetermined curved surface supported by the cushion frame 302, and an upper surface of the cushion panel 304. Cushion part 3 placed in
06, and a skin portion 3 that covers the surface of the cushion portion 306.
And 08.

FIG. 20 shows a state in which the cushion panel 304, the cushion portion 306, and the skin portion 308 are removed. As shown in this figure, the cushion panel 304 described above has a structure in which it is elastically supported by a torsion spring 310 on the front end side, and on the rear end side, a rear end link 312 and a tension spring 313, etc. The structure that elastically supports is adopted. Hereinafter, these support structures will be described.

Both sides 302 of the cushion frame 302
At the rear end side of A, the base portion 3 of the rear end link 312 having a substantially V shape is formed.
12A is rotatably supported by a hinge pin 314. At one end portion 312B of each rear end link 312, the rear end side portion of the cushion panel 304 is a bolt 31.
It is rotatably connected by 6. Further, the other end portion 312C of each rear end link 312 is engaged with the end portion of the wire 318 connected to one end portion of the tension spring 313. The tension spring 3
The other end of 13 is locked to the spring locking part 320 of the cushion frame 302. As a result, the rear end side of the cushion panel 304 is pushed upward by the biasing force of the tension spring 313 via the rear end link 312.

On the other hand, a rod 322 is stretched over the front end side of the cushion frame 302.
A torsion spring 310, which is substantially U-shaped in plan view, is wound around 2. And this torsion spring 3
The straight line portion 310A of 10 is locked to the lower surface of the cushion panel 304 on the front end side. The portion of the straight portion 310A of the torsion spring 310 that engages with the cushion panel 304 is slidable. As a result, the front end side of the cushion panel 304 is pushed upward by the biasing force of the torsion spring 310.

Here, in the above-mentioned seat cushion structure, in order to further improve this, the following structure is adopted.

That is, the serrations 3 are formed on the peripheral surface of the head of the hinge pin 314, which serves as a support shaft for the left and right rear end links 312.
24 are formed and are connected by a connecting rod 326. The connecting rod 326
Serrations (not shown) that mesh with the serrations 326 are also formed on the inner peripheral surfaces of both axial ends of the.

As a result, the following actions and effects can be obtained. When the left and right hinge pins 314 are not connected by the connecting rod 326, an inertial force (lateral G) in the seat width direction acts on the occupant during cornering, for example. The balance between the load acting on the side portion and the load acting on the other side portion is lost. Therefore, the axis of the hinge pin 314 on which the relatively large load acts is pushed down, and conversely, the axis of the hinge pin 314 on which the relatively small load acts is pushed up. Therefore, the cushion panel 304 slightly rotates in the vehicle front-rear direction (hereinafter, this phenomenon is referred to as "rolling" in this specification). However, as described above, if the left and right hinge pins 314 are connected by the connecting rod 326, the axes of the left and right hinge pins 314 are held on the same straight line, so that such rolling does not occur. From another point of view, the stabilizing effect on the occupant can be added.

[0010]

However, according to the structure disclosed in this application, the cushion panel 30 is used.
Although a stabilizing effect can be obtained on the rear end side of No. 4, a sufficient stabilizing effect cannot be obtained on the front end side of the cushion panel 304 because it is elastically supported by the torsion spring 310. More specifically, the torsion spring 3
In the structure elastically supported by 10, when the load imbalance as described above occurs, the torsion spring 310 behaves as follows. That is, when a relatively large load is applied, the locking portion of the linear portion 310A of the torsion spring 310 to the cushion panel 304 slides largely, and when a relatively small load is applied, the straight line of the torsion spring 310 is applied. Part 3
The locking part of 10A slides a little. Therefore,
The load acts on the torsion springs 310 evenly on the left and right, but from the viewpoint of the repulsive force that has the above-described stabilizing effect, the repulsive force tends to be insufficient when a relatively large load acts. As a result, a sufficient stabilizing effect cannot be obtained, and the performance for supporting the occupant's thigh (cy support performance) is reduced.

In consideration of the above facts, an object of the present invention is to obtain a seat cushion structure for a front seat capable of improving the occupant's cysupport performance by enhancing the stabilizing effect on the front end side of the support panel. .

[0012]

A seat cushion structure for a front seat according to the present invention as set forth in claim 1 is provided with a cushion portion on which an occupant is seated, and is arranged below the outer peripheral portion of the cushion portion to support the cushion portion. A support member constituting a skeletal member, a support panel on which the cushion portion is placed, and which forms a support surface of an occupant seated on the cushion portion,
The first connecting means for connecting the front end side of the support panel and the support member to elastically support the front end side of the support panel and the rear end side of the support panel for connecting the support member, A second connecting means for elastically supporting the end side,
Further, a torsion spring is used as one element of the first connecting means, and a block-shaped urethane pad is interposed between the front end side corners of the support panel and the front end side corners of the support member. It has a feature.

According to a second aspect of the present invention, there is provided a seat cushion structure for a front seat, which includes a cushion portion on which an occupant sits, and a lower portion of an outer peripheral portion of the cushion portion.
A support member that forms a skeleton member that supports the cushion portion, a support panel on which the cushion portion is placed and forms a support surface for an occupant seated on the cushion portion, and a front end side of the support panel and the support member are connected. First connecting means for elastically supporting the front end side of the support panel, and second connecting means for connecting the rear end side of the support panel and the support member and elastically supporting the rear end side of the support panel. And, as one element of the first connecting means, an intermediate portion which is substantially U-shaped in a plan view and is relatively rotatably locked to the front end side of the support panel,
A torsion spring having a pair of coil portions that are respectively provided on both end sides of the intermediate portion and supported in a deformable manner, and both end portions that extend from each coil portion and are respectively locked to the support member, are used. It is characterized by that.

[0014]

The operation of the present invention according to claim 1 is as follows.

When no inertial force is applied to the occupant in the vehicle running state, the front end side of the support panel is elastic by the torsion spring used as one element of the first connecting means. Supported by.

From this state, for example, in a corner traveling state, an inertial force in the seat width direction acts on the occupant sitting on the cushion portion. For this reason, a relatively large load tends to sink rather than a relatively small load. However, in the present invention, since the block-shaped urethane pad is interposed between the front end side corner portions of the support panel and the front end side corner portions of the support member, the urethane on which a relatively large load acts is formed. The pad is compressed, and the urethane pad generates a repulsive force commensurate with the amount of compression. As a result, this repulsive force contributes as a stabilizing effect, and the cysupport performance on the front end side of the support panel is improved.

The operation of the present invention according to claim 2 is as follows. It should be noted that, in the description, a part overlapping the description of the operation of the present invention according to claim 1 will be omitted.

According to the present invention, as an element of the first connecting means, an intermediate portion which is substantially U-shaped in plan view and is relatively rotatably engaged with the front end side of the support panel, and both end sides of this intermediate portion are provided. Since a torsion spring having a pair of coil portions that are respectively provided and supported in a deformable manner and both end portions that extend from each coil portion and are respectively locked to the support member is used, sit on the cushion portion. When an inertial force in the seat width direction acts on an occupant, the cysupport performance for the occupant is improved by the following two actions.

First, the middle portion of the torsion spring (that is, the substantially U-shaped portion) functions as a torsion bar. That is, when the inertial force acts, the intermediate portion of the torsion spring exhibits the following behavior. In the middle part of the torsion spring, the one with a relatively large load is more elastically deformed downward,
A relatively small load does not elastically deform. That is, a phase difference occurs on both sides of the intermediate portion of the torsion spring. Therefore, the torsion occurs in the central portion of the intermediate portion of the torsion spring. Therefore, an elastic restoring force (repulsive force) in the direction of eliminating the twist is generated in the middle portion of the torsion spring, and this repulsive force contributes as a stabilizing effect.

Secondly, when attention is paid to the pair of coil portions of the torsion spring, the coil portion to which a relatively large load acts is deformed in the buckling direction. That is,
When the inertial force acts, the coil portion to which a relatively large load acts is pushed down by the support panel and buckles and deforms in that direction, and a repulsive force corresponding to the amount of deformation is generated in this coil portion. To do. As a result, this repulsive force contributes as a stabilizing effect.

Due to these stabilizing effects, the cysupport performance on the front end side of the support panel is improved.

[0022]

【Example】

<< First Embodiment >> A seat cushion structure for a front seat according to a first embodiment of the present invention will be described below with reference to FIGS. In these drawings, an arrow FR, which is shown as appropriate, indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle interior side.

As shown in FIG. 1, the front seat 1
Reference numeral 0 includes a seat back 12 that supports the back of the occupant, a seat cushion 14 that supports the buttocks of the occupant, and a headrest 16 that supports the head of the occupant. Seat back 1
A substantially frame-shaped seat back frame 18 is disposed inside the seat 2, and the seat back 12 is supported by the seat back frame 18. Seat back frame 1
A plurality of types of back springs 20 and 22 are stretched on 8. In addition, both sides 18A of the seat back frame 18
The lower end portion of the seat back 12 is swingably connected to the hinge plate 24 attached to the rear end side of both side portions 44A of the cushion frame 32, which will be described later.
Can be tilted with respect to the seat cushion 14.

The structure of the seat cushion 14 will be described in detail below. As shown in FIG. 2, the seat cushion 14 includes a cushion pad 26, and the surface of the cushion pad 26 is covered with a cushion cover 28. The cushion pad 26 is placed on and connected to the cushion panel 30, and the cushion panel 30 is connected to the cushion frame 32. Hereinafter, description will be made in this order.

[Explanation of Cushion Panel 30] As shown in FIG. 3, the cushion panel 30 is formed by bending a plate material into a predetermined curved shape. Specifically, the cushion panel 30 is formed with a rear end concave curved surface portion 30A that constitutes the rear end side and a front surface of the rear end concave curved surface portion 30A that is continuous and has a gentle arc surface. An intermediate convex curved surface portion 30B and a front central flat surface portion 30C formed continuously on the front side of the intermediate convex curved surface portion 30B are provided. When an occupant sits on the seat cushion 14, the intermediate convex curved surface portion 30B and the rear end concave curved surface portion 30A are
The hip point of the occupant will be slightly closer to the rear end concave curved surface portion 30A than the boundary with.

Further, on both sides of the front central flat portion 30C, a square flat portion 30D is formed so as to be lowered by one step.
An inclined surface 30E connects between each rectangular flat surface portion 30D and the intermediate convex curved surface portion 30B. Further, the outer side edges of the pair of rectangular flat portions 30D are gently raised by the inclined surfaces 30F and 30G that are inclined stepwise. Further, a slightly convex outer peripheral convex surface portion 30H is continuously formed on the peripheral edges of the rear end concave curved surface portion 30A, the intermediate convex curved surface portion 30B, and the pair of inclined surfaces 30G, and the peripheral peripheral portion 30I has a channel shape. It is bent.

Weight reducing holes 34 and 36 are appropriately formed in the cushion panel 30 described above. Further, on the rear end side of the peripheral edge portion 30I, a reinforcement 38 having a rectangular cross section in the longitudinal direction and a substantially U shape in a plan view is fitted. Both ends of the reinforcement 38 and the peripheral portion 30 corresponding thereto
A through hole 40 is coaxially formed in I. Also,
The vicinity of the through hole 40 of the peripheral portion 30I is a recess 42.

[Description of Cushion Frame 32] Next,
The structure of the cushion frame 32 will be described.

As shown in FIG. 4, the cushion frame 32 includes a rectangular frame-shaped frame body 44. A straight rod-shaped rod 46 is stretched over both side portions 44A of the frame main body 44 between the front-rear direction intermediate portion and the front end portion. Further, at the front end portion 44B of the frame body 44,
A pair of spring locking portions 48 are erected on both sides 44A. The spring locking portion 48 has a mounting surface 48A on the lower surface of the front end portion 44B of the frame body 44 and a mounting surface 48B on the vertical surface of the front end portion 44B.
The engaging portion 48C is erected by connecting A and 48B. A circular hole formed in the center and a U-shaped notch formed in the front edge are provided at the upper end of the locking portion 48C.

Further, the spring engaging portion 48 and the rod 46
Between the spring locking plate 50 and the base 50A, which is a rectangular flat plate, fixed to the side 44A of the frame body 44.
Is provided. The spring locking plate 50 has a base 50.
An intermediate portion 50B that extends inward from the front and rear ends of A and intersects near the axially intermediate portion of the rod 46 is provided. A hook-shaped arm 50C is integrally formed at the inner end of the intermediate portion 50B, and is elastically locked to the peripheral surface of the rod 46.

[Connecting Structure of Cushion Panel 30 and Cushion Frame 32] Next, the connecting structure of the cushion panel 30 and the cushion frame 32 will be described in detail. The cushion panel 30 and the cushion frame 32 are connected to each other on the front end side and the rear end side, and the front end side connection structure and the rear end side connection structure will be described below in this order.

Connection Structure on Front End Side As shown in FIG. 5, metal brackets 52 are arranged on the back surfaces of the pair of rectangular flat portions 30D of the cushion panel 30. In FIG. 5, the cushion panel 30
Is cut along the center line to show the weight reduction hole 3
4, 36 are not shown.

The metal bracket 52 has a bottom portion 52A which is substantially rectangular in a plan view, and both side portions of the bottom portion 52A are bent in the same direction (upward side of the vehicle) to form an upright portion 52B. Further, the upper end portion of the upright portion 52B is bent in directions away from each other at a predetermined angle that matches the inclination angle of the inclined surface 30E of the cushion panel 30, and thus the splicing portion 5 is formed.
It is said to be 2C. The abutment portion 52C and the inclined surface 30E of the cushion panel 30 are spot-welded, whereby the metal bracket 52 is fixed to the back surface side of the rectangular flat surface portion 30D of the cushion panel 30, and the rectangular flat surface portion 30D of the cushion panel 30 is fixed. The rigidity of the neighborhood is raised. Further, an elliptical hole 54 is formed in the center of the bottom portion 52A of the metal bracket 52 to lighten it, and rivet holes 56 are formed at three locations around the elliptical hole 54.

On the back surface of the bottom portion 52A of the metal bracket 52, a slide base 58 made of a resin and having a rectangular shape in a plan view is closely arranged. In addition, in FIG. 5, a part of the slide base 58 is cut away. The rivet hole 56 of the metal bracket 52 is also included in the slide base 58.
A rivet hole 60 is formed corresponding to the above, and both are connected by a rivet (not shown). Slide base 5
A pair of rail portions 58 </ b> A are formed on both sides of 8 by being bent inwardly at an acute angle. A resin slider 62 is locked in the rail portion 58A.

The slider 62 is provided with a rectangular flat plate-shaped base portion 62A in plan view and a hook 62B integrally formed on the back surface side of the central portion of the base portion 62A. Base 62A
Both side portions of are inclined at a predetermined angle at an acute angle so as to be slidable along the rail portion 58A in the vehicle front-rear direction. The hook 62B is an arcuate claw, and can elastically deform to hold a linear portion 64A of a torsion spring 64 described later.

On the other hand, as shown in FIG. 4, a torsion spring 64 is locked on the cushion frame 32 side. That is, the torsion spring 64 is
The straight line portion 64A which is U-shaped in a plan view, and the straight line portion 6
4A, and coil portions 64B respectively formed at both ends of 4A. Both axial end portions of the linear portion 64A (both end portions on the width direction side of the cushion frame 32) are elastically and relatively rotatably engaged with the hooks 62B of the slider 62 as described above. In addition, the pair of coil portions 64B is the rod 4
The winding position is adjacent to the arm 50C of the spring locking plate 50 locked near both axial ends of the rod 46. Then, the ends of both coil portions 64B are connected to the intermediate portion 5 of the spring locking plate 50.
It is elastically locked to 0B. As a result, the torsion spring 64 is attached to the slider 62 and the metal bracket 5.
The cushion panel 30 is pressed and biased in the direction of arrow A in FIG. That is,
The front end of the cushion panel 30 is elastically connected to the cushion frame 32 by a torsion spring 64.

Connection structure on the rear end side The cushion frame 3 and the rear end side of the cushion panel 30
The two are connected by a tension spring 66, a rear end link 68, and the like.

The rear end link 68 is substantially V-shaped when viewed from the side, and a through hole 70 is formed at a base end 68C where one end 68A and the other end 68B intersect. Through holes (not shown) are also formed on both sides 44A of the frame body 44 of the cushion frame 32 coaxially with the through holes 70. A collar 74 having a slit formed in a part of its peripheral edge is fitted into these through holes 70 from the inside, and a hollow cylindrical bush 76 is coaxially fitted in the collar 74. In this state, the stepped bolt 78
Is fitted from the outside through the flat washer 80 and the nut 8
2 is screwed together. As a result, the rear end link 68 can be rotated about its axis around the smooth peripheral surface portion of the stepped bolt 78.

Further, as shown in FIG. 3, a through hole 84 is formed in one end portion 68A of the rear end link 68, and the collar 74 and the bush 7 are formed in the through hole 84.
6 is inserted from the outside. Bushings 86 having female threads formed on the inner peripheral surface of the bushes 86 are fitted into the through holes 40 at both ends of the reinforcement 38. A flat washer 80 is interposed between the one end 68A and the recess 42 of the cushion panel 30, and in this state, the bolt 8
8 is screwed from the outside (bush 76 side). As a result, one end portion 68A of the rear end link 68 is rotatable with respect to the reinforcement 38 of the cushion panel 30. The connection position between one end portion 68A of the rear end link 68 and the reinforcement 38 is separated from the hip point of the seated occupant by a predetermined distance (preferably about 50 mm) toward the vehicle rear side. The position is.

Further, as shown in FIG. 4, the other end portion 68B of the rear end link 68 is cranked inward so that both side portions 44 of the frame main body 44 of the cushion frame 32.
Avoiding interference with A. On the other end 68B, a spring locking bracket 90 whose upper end side edge and front end side edge are opened is fitted and spot welded.
A keyhole-shaped locking hole 92 is formed in the front end portions of both side plates of the spring locking bracket 90, and the locking hole 92 has a columnar shape fixed to the end portion of the wire 94 of the tension spring 66. The fixed portion 96 is fitted.
That is, the gap size between the two side plates is set to be slightly larger than the wire diameter of the wire 94 fixed to the fixing portion 96. Therefore, when the fixing portion 96 is fitted into the locking hole 92, the wire 94 is located between the two side plates so as to be rotatable around the fixed portion 96.

The tension spring 66 has a concentric double spring structure and is composed of an outer spring 100 and an inner spring 102. Outer spring 100
Is larger than the coil diameter of the inner spring 102, and the wire diameter of the outer spring 100 is also larger than that of the inner spring 102.

The front end hook of the outer spring 100 is locked in the U-shaped notch of the locking portion 48C of the spring locking portion 48 described above, and the rear end hook is formed in the longitudinal middle portion of the piece 104. It is locked in the long hole. The other end of the wire 94 described above is fixed to the rear end of the piece 104. On the other hand, the front end hook of the inner spring 102 is locked in the circular hole of the locking portion 48A of the spring locking portion 48, and the rear end hook is locked in the circular hole formed at the front end of the piece 104.

Therefore, the outer spring 100 and the inner spring 102 are integrated to form the tension spring 6
6, a biasing force in the direction of arrow B in FIG. 4 is applied to the other end 68B of the rear end link 68. As a result, the rear end link 68 has the stepped bolt 78 of the base end 68C.
The cushion panel 30 is urged in the direction of pushing up (the direction of arrow C in FIG. 4). The set spring force of the tension spring 66 is set to be larger than the set spring force of the torsion spring 64 described above.

By using the tension spring 66 having the double structure described above, it is possible to reduce the entire coil diameter (that is, the outer diameter of the outer spring 100) (tentatively, a single set spring force is the same. In order to obtain the above, the coil diameter of the tension spring is increased) and delicate tuning can be performed by changing the number of windings of the inner spring 102 having a small wire diameter. 66 tunings can be performed.

[Description of Urethane Pad 106] Next, the structure of the urethane pad 106 that imparts a stabilizing effect to the front end side of the cushion panel 30 will be described.

As shown in FIG. 6, the urethane pad 1
06 has a rectangular parallelepiped block shape. The hardness of this urethane pad 106 (25% hardness; TSF 6223
Method B) is 294 [N / 314 cm ² ] (= 30 kgf /
314cm ²⁾ to have been. It is known that urethane originally has a non-linear characteristic as shown by the load-deflection characteristic in FIG. 7, and in this embodiment, the range indicated by H is used.

As shown in FIGS. 1 and 2, the above-mentioned urethane pad 106 has the corner portions on the front end side of the cushion panel 30 and the corner portions on the front end side of the cushion frame 32 (both side portions 4 of the frame body 44).
4A and the front end portion 44B cross each other, and are arranged at a position where they do not interfere with the movement trajectory of the straight portion 64A of the torsion spring 64). The bottom surface of the urethane pad 106 is bonded to a mounting seat surface 108 (see FIG. 4) formed on the front end portion 44B of the frame body 44. Further, although the top surface of the urethane pad 106 is in close contact with the back surfaces of both corner portions on the front end side of the cushion panel 30, it may be slightly separated.

The operation of this embodiment will be described below. When the occupant is seated on the seat cushion 14, the rear end link 68 resists the urging force of the tension spring 66 by the weight of the occupant and moves in the direction opposite to the arrow C direction in FIG. 4 about the stepped bolt 78 at the base end 68C. Rotate. Further, the torsion spring 64 rotates in the direction opposite to the arrow A direction in FIG. Thereby, the cushion panel 30
Is displaced downward. At this time, the slider 62 slides from the intermediate position of the slide base 58 to the vicinity of the front end along the rail portion 58A of the slide base 58. Then, the displacement of the cushion panel 30 is stopped in a state where the urging forces of the torsion spring 64 and the tension spring 66 are balanced with the loads of members such as the cushion pad 26 and the cushion panel 30 and the weight of the occupant. In addition, normally, the vehicle traveling state is maintained in this state.

When the vehicle enters a corner traveling state from this state, as shown in FIG. 8, an inertial force acts on the occupant in the seat width direction (arrow G direction). Therefore, the body posture of the occupant inclines from the two-dot chain line illustrated state to the solid line illustrated state. Therefore, when focusing on the front end side of the cushion panel 30, a relatively large load is applied to the right corner portion in the figure. Therefore, the corner portion of the cushion panel 30 tries to sink downward against the biasing force of the torsion spring 64.

However, in this embodiment, since the block-shaped urethane pad 106 is interposed between the front corners of the cushion panel 30 and the front corners of the cushion frame 32, the urethane pad 106 is sunk. The corner portion of the cushion panel 30 to be compressed compresses the urethane pad 106. Therefore, the repulsive force corresponding to the compression amount is applied to the urethane pad 106.
This repulsive force acts on the corner portion of the cushion panel 30. And this repulsive force gives a stabilizing effect.

As described above, in this embodiment, both corners on the front end side of the cushion panel 30 and the cushion frame 3 are provided.
Since the block-shaped urethane pad 106 is interposed between the two corners on the front end side of 2, even if the load balance is lost due to the inertial force in the seat width direction acting on the occupant, the stabilizing effect is surely obtained. As a result, the side support performance on the front end side of the cushion panel 30 can be improved.

In this embodiment, the linear portion 64A of the torsion spring 64 is locked to the slider 62, and the slider 62 is slid with respect to the slide base 58. May be adopted. That is, as shown in FIG. 9, the cylindrical roller 11 is provided at both ends of the straight portion 64A of the torsion spring 64.
0 is inserted and the recess 1 is formed in the slide base 112 to roll the roller 110 as shown in FIG.
14 may be formed. With this configuration, the roller 110 rolls in the recess 114 of the slide base 112 as the torsion spring 64 elastically deforms. Therefore, since only the rolling friction force acts, the frictional resistance is further reduced as compared with the case where the slider 62 is used, and there is an advantage that the operation becomes smoother. Further, it is sufficient to form the recess 114 in the slide base 112,
Since the roller 110 also has a cylindrical shape, the structure can be simplified and the molding is facilitated. << Second Embodiment >> Next, a second embodiment of the present invention will be described with reference to FIGS.

The present embodiment is characterized in that the stabilizer pad 138 itself is used without using the urethane pad 106 used in the first embodiment, and the behavior of the torsion spring 138 itself is utilized to improve the above-described stabilization effect and thus the cysupport performance. .

As shown in FIG. 11, mounting brackets 128 each having an angle in plan view are arranged on the front end sides of both side portions 126C of the cushion frame 126. A C-shaped clamp portion 128A is integrally formed at each tip of the mounting bracket 128. In addition, the mounting bracket 128 has bolts and nuts at its center portion on both sides 126C of the cushion frame 126.
It is fixed to the front end side of.

On the other hand, the front end portion 1 of the cushion panel 124
A pair of mounting brackets 130 is arranged on both sides of the back surface of 24A. As shown in FIG. 12, each mounting bracket 130 has a hat-shaped cross section in which a central portion 130A bulges in a trapezoidal shape toward the cushion frame 126 side. A boss 130B having an internal thread formed on the inner peripheral surface is integrally formed at both ends of the mounting bracket 130, and the mounting bracket 130 is attached to the cushion panel 12 by screwing a bolt 132 into the boss 130B.
4 is fixed to the back surface of the front end portion 124A. A resin guide piece 134 is housed between the central portion 130A of the mounting bracket 130 and the back surface of the front end portion 124A of the cushion panel 124. The guide piece 134 has a U-shaped groove 136 extending from the bottom surface to the shaft core.
Are formed.

As shown in FIG. 11, the torsion spring 138 is mounted by the mounting brackets 128 and 130 described above. That is, the torsion spring 138 includes a linear portion 138A bent in a U shape in a plan view, a pair of coil portions 138B provided on both sides of the linear portion 138A, and both ends bent in an angle shape from each coil portion 138B. And a portion 138C. Of these, both ends 138C of the torsion spring 138
However, the mounting bracket 12 on the cushion frame 126 side
It is sandwiched between eight clamp portions 128A. Further, the straight portion 138A of the torsion spring 138 is inserted and supported in the groove 136 of the guide piece 134 of the mounting bracket 130 on the cushion panel 124 side. Although the linear portion 138A is relatively rotatable within the groove 136 of the guide piece 134, the linear portion 138A does not slide in the seat front-rear direction because the guide piece 134 is fixed. Further, since the rod 46 used in the first embodiment described above is not used in this torsion spring 138, the pair of coil portions 138B can be deformed when the torsion spring 138 is attached. With the configuration described above, the torsion spring 138 urges the front end portion 124A of the cushion panel 124 in the pushing-up direction. That is, the front end side of the cushion panel 124 is elastically supported on the front end side of the cushion frame 126 by the torsion spring 138.

The structure for connecting the rear end side of the cushion panel 124 and the rear end side of the cushion frame 126 is different from that of the first embodiment described above, and will be described below.

Both sides 126 of the cushion frame 126
The rear end side of C has an angle-shaped rear end link 14 in a plan view.
0 is attached respectively. Rear link 140
Is one end 140A extending in parallel along the wall surfaces of both side portions 126C of the cushion frame 126, and the other end 140B extending substantially parallel along the wall surface of the rear end portion 126B of the cushion frame 126. And a base 140C where one end 140A and the other end 140B intersect each other.

A through hole (not shown) is formed in the base portion 140C of the rear end link 140, and a drum-shaped collar is fitted in the through hole. Further, a drum-shaped bush 144 is fitted in the inner peripheral portion of this collar. In this state, the stepped bolt 146 is inserted from the inside of the cushion frame 126 and screwed into the weld nut 148. As a result, the rear end link 140 is rotatable about its axis around the smooth peripheral surface portion of the stepped bolt 146.

Further, one end portion 14 of the rear end link 140 is
A through hole is formed in 0A, and a drum-shaped collar and a bush 152 of one flange are fitted in the through hole. Correspondingly, a through hole is also formed on both sides 124C of the cushion panel 124 coaxially with the through hole. Then, both side portions 124C of the cushion panel 124
A flat washer is interposed between the rear end link 140 and the rear end link 140, and in this state, the stepped bolt 158 is inserted from the outside of the rear end link 140.
Is screwed onto the nut 160. As a result, the one end 140A of the rear end link 140 is connected to the stepped bolt 158.
It is rotatable about its axis around the smooth peripheral surface portion of the.

Furthermore, the other end 1 of the rear end link 140
40B extends from the base 140C along the rear end 126B of the cushion frame 126 while being bent in multiple stages. A notch 1 is formed at the tip of the other end 140B.
62 is formed, and the rear end hook 164A of the tension spring 164 is locked in the notch 162. Front end hook 164B of tension spring 164
Is integrally formed on the intermediate portion in the longitudinal direction of both side portions 126C of the cushion frame 126, and
6 is an arm-shaped engaging portion 166 extending toward the center side
Is locked to. Therefore, the tension spring 16
4 urges the other end 140B of the rear end link 140 in the pulling direction. As a result, the tension spring 164 causes the cushion panel 1 to pass through the rear end link 140.
The rear end portion 124B of 24 is urged in the upward direction.
That is, on the rear end side of the cushion panel 124, the tension spring 164 is used for the cushion frame 12
6 is elastically supported on the rear end side.

The operation of this embodiment will be described below. As described above, the inertial force in the seat width direction (the direction of arrow G) acts on the occupant when the vehicle travels from the normal state to the corner traveling state. In this case, the torsion spring 138 of this embodiment exhibits the following behavior. In describing the behavior, the torsion spring 138 is denoted by a reference numeral as shown in FIGS. 13 to 15. In addition,
In these figures, the solid line shows the unloaded state of the torsion spring 138, and the two-dot chain line shows the loaded state of the torsion spring 138. FIG. 14 shows the torsion spring 1 of FIG.
FIG. 38 is a view of the device 38 viewed from the direction of the arrow P in FIG.
FIG. 4 is a view of the torsion spring 138 of FIG.

For example, when a relatively large load is applied to the left side of the cushion panel 124, the left arm portion 138A ₁ of the linear portion 138A is the right arm portion 138.
It is elastically deformed downward much more than A ₂ . For this reason, a phase difference occurs between both arm portions 138A ₁ and 138A ₂ . Thus, since the arm portions 138A ₃ of the straight portion 138A is twisted, the elastic restoring force to the arm portion 138A ₃ (repulsive force) is generated. This repulsive force contributes as a stabilizing effect.

Focusing on the coil portion 138B, the left coil portion 138B ₁ is the right coil portion 138B.
Compared to _2, it deforms in the direction of buckling. For this reason,
The elastic restoring force (repulsive force) corresponding to this deformation amount is applied to the coil portion 1.
38B ₁ occurs. This repulsive force contributes as a stabilizing effect.

As a result, like the first embodiment described above,
Due to these stabilizing effects, the side support performance on the front end side of the cushion panel 124 can be improved.

Further, in this embodiment, the behavior of the torsion spring 138 itself is utilized to obtain the stabilizing effect to improve the cysupport performance.
The following effects are obtained as compared with the first embodiment.

First, the effect of reducing abnormal noise is obtained. That is, the guide piece 134 which straight portion 138A of the torsion spring 138 (the arm portions 138A ₃₎ is locked is because they do not slide, relative to the slider 62 to the structure to slide, Suridoon (rubbing sound) does not occur . Further, the pair of coil portions 1 of the torsion spring 138
38B is deformably supported in the hollow, so that the rod 4
Compared with the above-mentioned structure having 6 as the shaft core, no contact noise is generated.
Therefore, these abnormal noises can be prevented from occurring, and the abnormal noises of the seat cushion 14 as a whole can be reduced.

Next, the number of parts can be greatly reduced. Specifically, the rod 46 used in the first embodiment,
Parts such as the spring locking plate 50, the metal bracket 52, the slide base 58, and the slider 62 can be eliminated. Therefore, from this, the number of assembling steps can be reduced and the cost can be reduced. Further, the effect of reducing the number of parts also has the effect of simplifying the structure. << Third Embodiment >> Next, a third embodiment of the present invention will be described with reference to FIGS. The same components as those in the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, a structure for imparting a stabilizing effect to the front end side of the cushion panel described in the structures of the first and second embodiments described above (arrangement of urethane pad, behavior of the torsion spring itself). It is characterized by the addition of the structure for imparting a stabilizing effect on the rear end side of the cushion panel (connecting the left and right rear end links with a connecting rod) described in the section of the prior art to (Usage). To do.

FIG. 16 shows a structure in which a connecting rod 230 is added to the structure of the first embodiment.
As shown in this figure, the above-mentioned urethane pads 106 are arranged on both sides of the front end of the cushion frame 32, and the left and right rear end links 68 are connected by a connecting rod 230 at the rotation center position thereof. That is, as shown in FIGS. 16 and 17, serrations 232 are formed on the inner peripheral surfaces of both axial end portions 230A of the connecting rod 230, and the serrations 232 are formed on the head peripheral surface of the hinge pin 234. The serrated 236 is fitted in a relatively tight fit.
The hinge pin 234 has a circular washer 238 at an axially intermediate portion.
Are integrally fixed, and the washer 238 and the inner surface of the base portion 68C of the rear end link 68 are welded to each other. Therefore, the hinge pin 234 rotates integrally with the rear end link 68. A groove 240 is formed on the peripheral surface of the tip end portion of the hinge pin 234 in the axial direction.

On the other hand, a flat washer 242 for securing the contact surface with the peripheral surface of the hinge pin 234 is welded to the outer surface of the side portion 44A of the frame body 44. A spool-shaped bush 244 made of resin or copper is fitted to the side portion 44A of the frame body 44 and the flat washer 242. The hinge pin 234 described above penetrates into the bush 144. The E-ring 246 is fitted into the groove 240 of the hinge pin 234 in a penetrated state, and the hinge pin 234 is prevented from coming off. Note that the axial intermediate portion of the hinge pin 234 may be formed into a stepped bolt shape, and a nut may be screwed instead of using the E ring 246.

According to the above structure, the left and right rear end links 68 are provided.
Since the hinge pin 234 serving as a support shaft of the vehicle is connected by the connecting rod 230, when the inertial force in the seat width direction acts on the occupant, it is possible to prevent the axes of the left and right hinge pins 234 from trying to deviate from each other. it can. As a result, the stabilizing effect can be obtained even on the rear end side of the cushion panel 30. As a result, the stabilizer effect can be obtained on both the front end side and the rear end side of the cushion panel 30.

FIG. 18 shows a structure in which a connecting rod 230 is added to the structure of the second embodiment, but the connecting structure itself of the left and right rear end links 140 is the same as that described above. The description is omitted. Also in this case, it is possible to obtain the stabilizing effect on both the front end side and the rear end side of the cushion panel 30.

As can be seen from the third embodiment, claim 1
When the present invention described above or the present invention described in claim 2 is limited as follows, it becomes possible to obtain a stabilizing effect on both the front end side and the rear end side of the support panel (cushion panel). (1) A cushion portion on which an occupant is seated, a support member that is disposed below the outer peripheral portion of the cushion portion, and constitutes a skeletal member that supports the cushion portion, and an occupant on which the cushion portion is placed and seated on the cushion portion. A support panel forming a support surface of the support panel, first connecting means for connecting the front end side of the support panel and the support member, and elastically supporting the front end side of the support panel, and one end portion of both side portions of the support panel. It is connected to the rear side and the other end is connected to an urging means (tension spring corresponds to this) having an urging force in the pulling direction, and can swing around a support shaft (hinge pin corresponds to this). Pair of second elastically supporting the rear end side of the support panel
And a torsion spring is used as an element of the first connecting means, and a block-shaped connection is provided between the front end side corners of the support panel and the front end side corners of the support member. A seat cushion structure for a front seat, characterized in that a urethane pad is interposed and a shaft connecting means (a connecting rod corresponds to this) is provided for connecting each shaft of a pair of second connecting means. (2) A cushion portion on which an occupant is seated, a support member that is arranged below the outer peripheral portion of the cushion portion, and constitutes a skeleton member that supports the cushion portion, and an occupant on which the cushion portion is placed and seated on the cushion portion. A support panel forming a support surface of the support panel, first connecting means for connecting the front end side of the support panel and the support member, and elastically supporting the front end side of the support panel, and one end portion of both side portions of the support panel. It is connected to the rear side and the other end is connected to an urging means (tension spring corresponds to this) having an urging force in the pulling direction, and can swing around a support shaft (hinge pin corresponds to this). Pair of second elastically supporting the rear end side of the support panel
And an intermediate portion that is substantially U-shaped in plan view and is rotatably locked to the front end side of the support panel as one element of the first connecting means, and the intermediate portion. A torsion spring having a pair of coil portions provided on both end sides of each of the coil portions and supported in a deformable manner, and both end portions of the coil portions extending from the coil portions and locked by the support member are used. A seat cushion structure for a front seat, characterized in that support shaft connecting means (connecting rods correspond to this) for connecting the support shafts of the second connecting means are provided.

[0075]

According to the seat cushion structure for a front seat of the present invention as defined in claim 1, one of the first connecting means for elastically supporting the front end side of the support panel forming the support surface of the seated occupant. A torsion spring is used as an element, and a block-shaped urethane pad is interposed between the front end side corners of the support panel and the front end side corners of the support member, enhancing the stabilizer effect on the front end side of the support panel. This has an excellent effect that the occupant's cy support performance can be improved.

In the seat cushion structure for a front seat according to the present invention as defined in claim 2, one of the first connecting means for elastically supporting the front end side of the support panel forming the support surface of the seated occupant. As an element, an intermediate portion which is substantially U-shaped in a plan view and which is relatively rotatably locked to the front end side of the support panel, and a pair of coil portions which are provided at both end sides of the intermediate portion and are deformably supported, respectively. Since the torsion spring having the two ends extending from each coil portion and respectively locked to the support member is used, the stabilizing effect on the front end side of the support panel is obtained similarly to the present invention according to claim 1. By increasing the strength, it has an excellent effect that the occupant's cy support performance can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a front seat according to a first embodiment.

FIG. 2 is a perspective view showing the structure of the seat cushion of FIG.

FIG. 3 is a partially exploded perspective view showing the cushion panel and the like of FIG.

FIG. 4 is a perspective view showing the cushion frame of FIG.

5 is an exploded perspective view showing a connection structure between the torsion spring of FIG. 4 and the cushion panel of FIG.

FIG. 6 is a perspective view showing a urethane pad having a stabilizing effect.

FIG. 7 is a graph showing load-deflection characteristics of the urethane pad of FIG.

FIG. 8 is an explanatory diagram for explaining an action when an inertial force in a seat width direction acts on an occupant.

FIG. 9 is a plan view showing a part of a modified example of a configuration using a slider.

FIG. 10 is a plan view showing another part of the modified example of the configuration using the slider.

FIG. 11 is a perspective view showing a structure of a seat cushion according to a second embodiment.

FIG. 12 is a vertical cross-sectional view of FIG.

FIG. 13 is an explanatory diagram for explaining the behavior of the torsion spring.

FIG. 14 is an explanatory view of the torsion spring of FIG. 13 viewed from the direction of the arrow P.

FIG. 15 is an explanatory view of the torsion spring shown in FIG. 13 viewed from the direction of the arrow Q.

FIG. 16 is a perspective view showing a structure of a seat cushion improved from the first embodiment according to the third embodiment.

17 is a cross-sectional view showing a connecting structure of the connecting rod of FIG.

FIG. 18 is a perspective view showing a structure of a seat cushion improved from the second embodiment according to the third embodiment.

FIG. 19 is a perspective view showing a conventional seat cushion structure.

20 is a perspective view showing a support structure on a front end side and a rear end side of the seat cushion shown in FIG.

[Explanation of symbols]

10 Front Seat 14 Seat Cushion 26 Cushion Pad (Cushion Part) 30 Cushion Panel (Support Panel) 32 Cushion Frame (Support Member) 58 Slide Base (First Connection Means) 62 Slider (First Connection Means) 64 Torsion Spring ( First connecting means) 66 Tension spring (biasing means, second connecting means) 68 Rear end link (second connecting means) 78 Stepped bolt (second connecting means) 88 Bolt (second connecting means) ) 106 Urethane pad 138A Straight part (intermediate part of torsion spring) 138B Coil part (coil part of torsion spring) 138C Both ends (both ends of torsion spring)

Claims (2)

[Claims] 1. A cushion portion on which an occupant is seated, a support member which is arranged below the outer peripheral portion of the cushion portion and constitutes a skeleton member for supporting the cushion portion, and the cushion portion is placed and seated on the cushion portion. A support panel that forms a support surface for the occupant, first connecting means that connects the front end side of the support panel and the support member, and elastically supports the front end side of the support panel, and the rear end side of the support panel. And a support member, and second connecting means for elastically supporting the rear end side of the support panel. Further, a torsion spring is used as an element of the first connecting means, and the support panel is provided. A seat cushion structure for a front seat characterized in that a block-shaped urethane pad is interposed between both front end side corner portions of the support member and both front end side corner portions of the support member. 2. A cushion portion on which an occupant is seated, a support member which is disposed below the outer peripheral portion of the cushion portion and constitutes a skeleton member for supporting the cushion portion, and the cushion portion is placed and seated on the cushion portion. A support panel that forms a support surface for the occupant, first connecting means that connects the front end side of the support panel and the support member, and elastically supports the front end side of the support panel, and the rear end side of the support panel. And a support member, and second connecting means for elastically supporting the rear end side of the support panel, and, as an element of the first connecting means, is substantially U-shaped in plan view. And a pair of coil portions provided at both ends of this intermediate portion and supported in a deformable manner, and an intermediate portion that is locked to the front end side of the support panel so as to be rotatable relative to each other, and extended from and supported by each coil portion. Both ends that are respectively locked to the member A seat cushion structure for a front seat, characterized by using a torsion spring having.