JP4041917B2 - Vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat, and more particularly to a vehicle seat in which a suspension mechanism that receives a cushion frame includes a torsion spring and a tension spring.
[0002]
[Prior art]
A vehicle seat generally includes a suspension mechanism that receives a cushion frame as disclosed in, for example, Japanese Patent Laid-Open No. 5-228039. In the vehicle seat of the type provided, a suspension mechanism including a torsion spring is employed as the suspension mechanism.
[0003]
[Problems to be solved by the invention]
By the way, in the vehicle seat of this type, the spring force of the torsion spring is set so as to obtain the optimum cushioning property for the seat cushion, but the spring reaction force against the load of the torsion spring has a certain limit. When the load is suddenly applied to the seat cushion or when an excessive load is applied, the deflection amount of the suspension mechanism has a certain limit as shown in the graph A in FIG. Will be damaged, resulting in a feeling of bottoming.
[0004]
Accordingly, an object of the present invention is to cope with the above-described problems by employing both a torsion spring and a tension spring as springs constituting the suspension mechanism in the vehicle seat of this type.
[0005]
[Means for Solving the Problems]
The present invention is a vehicle seat provided with a suspension mechanism for receiving a cushion frame, the suspension mechanism including a torsion spring and a tension spring having a spring force larger than the spring force of the torsion spring, The torsion spring exhibits a spring function when the load is less than a predetermined value, and both the torsion spring and the tension spring exhibit a spring function when the load on the cushion frame is a predetermined value or more. It is.
[0006]
The vehicle seat according to the present invention may include a spring force adjusting mechanism that adjusts a spring force of a torsion spring that constitutes the suspension mechanism.
[0007]
Further, in the vehicle seat according to the present invention, the suspension mechanism includes a torsion bar spring having one end supported on the cushion frame side and the other end supported on the vehicle floor side, and left and right on the cushion frame side. A rod supported at the end, a pair of left and right links rotatably supported at the lower end on the vehicle floor side and connected to the rod at the upper end, and one end connected to the vehicle floor side And a tension coil spring having the other end connected to the torsion bar spring.
[0008]
Further, in the vehicle seat according to the present invention, the spring force adjusting mechanism is supported on the vehicle floor side so as to be pivotable in the vertical direction, and is provided with a rotating arm that supports an intermediate portion of the torsion bar spring. An operating arm that is connected to the rotating arm and integrally rotates in the vertical direction when rotating, an operating shaft that includes an operating handle and is rotatably supported on the vehicle floor side, and the operating shaft A movable member that advances and retreats by rotation of the vehicle, a swing arm that is pivotally supported on the vehicle floor side and has one end connected to the movable member, and the other end of the swing arm and the operating arm. It can be constituted by a connected operation wire.
[0009]
[Operation and effect of the invention]
In the vehicle seat according to the present invention, the suspension mechanism for receiving the cushion frame includes a torsion spring and a tension spring having a spring force larger than the spring force of the torsion spring, and if the load on the cushion frame is less than a predetermined value, the torsion spring There exert spring function and load on the cushion frame is in the above predetermined value, both springs Te emissions Deployment spring and the torsion spring is configured to exert a spring function.
[0010]
For this reason, in the vehicle seat, by appropriately setting the spring force of the torsion spring, the cushioning property of the seat cushion can be set to an optimum state, and the seating comfort of the occupant can be made comfortable. it can.
[0011]
Further, in the sheet for the vehicle, if the load is an excessive load or is rapidly added is added to the seat cushion, it exerts a spring function with greater tension spring Gato Activation spring of the spring force from the torsion spring Then accept the seat cushion. For this reason, the suspension mechanism increases the amount of bending as shown in graph B of FIG. 9, improves the cushioning property of the seat cushion, does not cause a feeling of bottoming, and maintains a comfortable seating comfort for the occupant.
[0012]
If the vehicle seat according to the present invention is provided with a spring force adjusting mechanism for adjusting the spring force of the torsion spring constituting the suspension mechanism, the spring force of the suspension mechanism is adjusted by the spring force adjusting action of the spring force adjusting mechanism. Is adjusted to a desired value.
[0013]
For this reason, in the vehicle seat, when the occupant seated on the seat cushion has a large weight difference, that is, when the load on the seat cushion is greatly different, the spring force of the suspension mechanism is accurately adjusted by the spring force adjusting mechanism. It can be adjusted to provide comfortable cushioning regardless of large weight differences.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 schematically shows an example of a vehicle seat according to the present invention. The vehicle seat includes a seat cushion SC, a seat back SB that is assembled and raised at the rear end of the seat cushion SC, and an armrest AR that is assembled to each side of the seat back SB and extends horizontally forward. As shown in FIG. 2, the cushion frame 10 constituting the seat cushion SC is received by a pair of left and right seat tracks 20 disposed on the vehicle floor via a suspension mechanism 30. Further, the vehicle seat includes a spring force adjusting mechanism 40 that adjusts the spring force of the suspension mechanism 30.
[0015]
In the vehicle seat, the seat track 20 corresponds to a component on the vehicle floor side in the present invention.
[0016]
The cushion frame 10 has a substantially rectangular frame 11 as a main constituent member, and mounting arms 12 and 13 are provided at left and right ends of the rear portion of the frame 11. The attachment arms 12 and 13 are attached to the left and right attachment arms provided at the lower end portion of the back frame (not shown) constituting the seat back SB, and hold the seat back SB upright in the attached state.
[0017]
As shown in FIGS. 2 to 4, the seat track 20 includes a lower rail 21 fixed to the vehicle floor, an upper rail 22 fitted on the lower rail 21 so as to be slidable in the longitudinal direction, and the upper rail 22 as the lower rail 21. A lock mechanism 23 that releasably locks is used as a main component. A front bracket 24 and a rear bracket 25 are provided on the upper rail 22. A base plate 26 is provided in a bridge shape at the front end portions of the left and right upper rails 22.
[0018]
3 is a lock release lever 23a constituting the lock mechanism 23, and the lock mechanism 23 locks the upper rail 22 with respect to the lower rail 21 by rotating the lock release lever 23a in the vertical direction. The upper rail 22 is allowed to slide in the front-rear direction with respect to the lower rail 21.
[0019]
2 to 6, the suspension mechanism 30 includes a pair of left and right rear links 31, a pair of torsion bar springs 32a and 32b, a pair of left and right front links 33, a pair of front and rear connecting rods 34a and 34b, and a tension. A coil spring 35 is provided.
[0020]
Each rear link 31 is supported by each rear bracket 25 on each upper rail 22 so as to be pivotable in the vertical direction via a support pin 31a at the rear end thereof, and each front link 33 is supported on each upper rail 22 Each of the front brackets 24 is supported by a rear end portion thereof via a support pin 33a so as to be rotatable in the vertical direction.
[0021]
Each of the torsion bar springs 32a and 32b is formed by bending one end side into a U shape and bending the other end side into an L shape, and is arranged symmetrically. In each torsion bar spring 32a, 32b, the other end portion is fixed to the rear bracket 25 and extends upwardly inclined to the right side or the left side, and the tip portion on one end side is a long hole provided in each rear link 31. 31b is inserted from the outside and hooked.
[0022]
Each torsion bar spring 32a, 32b passes on a rotating arm 41 constituting a spring force adjusting mechanism 40 described later, and an intermediate portion thereof is supported on the rotating arm 41 via a clamp 41a. Yes. Each rear link 31 extends obliquely upward and forward in a state where the torsion bar springs 32a and 32b are hooked.
[0023]
The rear connecting rod 34b is fitted and fixed in a recess in the front end portion of each rear link 31, and connects the rear links 31 to each other. The frame 11 is supported. The range of rotation of each rear link 31 is restricted when each rear link 31 comes into contact with a protruding stopper portion 25 a provided on the upper portion of the rear bracket 25.
[0024]
On the other hand, each front link 33 is supported by a front bracket 24 provided on the upper rail 22 of the seat track 20 so that its lower end is pivotable in the vertical direction via a support pin 33a. They are connected to each other by a fixed front connecting rod 34a. The left and right ends of the front connecting rod 34a are connected to the frame 11 of the cushion frame 10, and are connected to the rear connecting rod 34b via the left and right connecting plates 36a and the connecting arms 36b. .
[0025]
The tension coil spring 35 is hooked on a hook 26a provided at the center of the rear portion of the base plate 26 at the front end, and is hooked on a connecting arm 34c provided on the rear connecting rod 34b. It is located at the approximate center. In this arrangement state, the tension coil spring 35 is set to a spring force larger than that of the torsion bar springs 32a and 32b.
[0026]
The suspension mechanism 30 includes a shock absorber 37. The shock absorber 37 has a front end connected to a bracket 34d provided on the front connecting rod 34a, and a rear end connected to a bracket 36c provided on the rear end of the connection plate 36a.
[0027]
2 to 5, the spring force adjusting mechanism 40 includes a pair of left and right rotating arms 41, a pair of left and right operating arms 42, an operation shaft 43, a movable member 44, a pair of left and right swing arms 45, and a pair of left and right swing arms. The rotating arms 41, the operating arms 42, the swinging arms 45, and the operating wires 46 are arranged below the cushion frame 10 with respect to the operating shaft 43 and the movable member 44. They are arranged symmetrically with respect to the central axis passing through the arrangement site.
[0028]
Each turning arm 41 is supported by each rear bracket 25 provided on the rear end portion of each upper rail 22 so as to be turnable in the vertical direction via a support pin 41b and extends forward.
[0029]
Each actuating arm 42 is supported by the rear bracket 25 on the upper rail 22 of the seat track 20 so as to be pivotable in the vertical direction via a support pin 42a, and is coupled to each pivot arm 41 via a connecting pin 42b. Yes. The connecting pin 42 b is implanted at the rotating end of each operating arm 42. By inserting the connecting pin 42 b into a long hole 41 c provided in each rotating arm 41, each operating arm 42 and each rotating arm 41 are connected. Are connected to each other.
[0030]
The operation shaft 43 includes a screw portion 43a and a handle portion 43b, passes through a bearing 26b standing on the rear end portion of the base plate 26, and is supported so as to be able to advance and retreat in the front-rear direction. The movable member 44 is screwed so as to be movable back and forth in the front-rear direction. The operation shaft 34 protrudes forward from the center of the front side portion below the cushion frame 10, and a handle portion 43 b is attached to the tip of the protruding portion.
[0031]
Each oscillating arm 45 extends in the lateral direction so as to be pivotally supported on each of the left and right sides of the base plate 26 via a support pin 45a at an intermediate portion thereof. It is rotatably connected to the movable member 44 via 45b. Each operation wire 46 is connected to the outer end portion of each swing arm 45 at the front end portion thereof, and is connected to each operation arm 42 at the rear end portion thereof. 42 are connected to each other.
[0032]
In the vehicle seat provided with the suspension mechanism 30 and the spring force adjusting mechanism 40 having such a configuration, a comfortable cushion performance is exhibited by the function of the suspension mechanism 30, and the spring force of the suspension mechanism 30 by the spring force adjusting mechanism 40 is exhibited. A comfortable cushion performance corresponding to the weight difference of the seated person is exhibited by the adjustment.
[0033]
FIG. 6 shows the operating state of the suspension mechanism 30. The state indicated by the solid line in FIG. 6 is an unloaded state in which no occupant is seated, and the state indicated by the two-dot chain line in FIG. Each load state is shown.
[0034]
In the suspension mechanism 30, when the seat cushion SC is in an unloaded state where no occupant is seated, the rear links 31 are provided with spring forces of the torsion bar springs 32a and 32b as shown by the solid lines in FIG. The front link 33 is in the upward rotation position, and the shock absorber 37 is in the contracted state, and the seat cushion SC is received in this state.
[0035]
When an occupant sits on the seat cushion SC in this state, a load acts on the suspension mechanism 30 via the seat cushion SC. As a result, in the suspension mechanism 30, the torsion bar springs 32a and 32b are twisted in response to the load from the seat cushion SC, and the rear links 31 and the front links 33 are rotated forward and downward, and finally. Is a state indicated by a two-dot chain line in FIG.
[0036]
During this time, the torsion bar springs 32a and 32b are gradually twisted to increase the elastic force and correspond to the load acting on the seat cushion SC. During this time, the shock absorber 37 is extended by the rotation of the rotation arm 34d to absorb the impact and vibration generated by the action of the load.
[0037]
Further, during this time, when the load acting on the seat cushion SC is less than a predetermined value, the rotation position of the connecting arm 34c is within the range between the position A and the position B in FIG. In FIG. 9, only the spring force of the torsion bar springs 32a and 32b is exerted, and the deflection amount of the suspension mechanism 30 is the point B and the point B in the graph B in FIG. It is in the range.
[0038]
During this time, if the load acting on the seat cushion SC is equal to or greater than a predetermined value, the rotation position of the connecting arm 34c exceeds the position of B in FIG. In the suspension mechanism 30, the tension coil spring 35 also acts to exert the spring force of the torsion bar springs 32 a and 32 b and the spring force of the tension coil spring 35, and the deflection amount of the suspension mechanism 30 is as shown in FIG. It falls within the range of point B and point C in graph B.
[0039]
As described above, in the vehicle seat, by appropriately setting the spring force of the torsion bar springs 32a and 32b, the cushioning property of the seat cushion SC can be set to an optimum state, and the seating comfort of the occupant can be improved. When the load is applied suddenly or excessively to the seat cushion SC, the tension coil spring 35 having a spring force larger than that of the torsion bar springs 32a and 32b is applied. The seat cushion SC is received by exerting a spring function together with the bar springs 32a and 32b. For this reason, the suspension mechanism 30 increases the amount of bending, improves the cushioning property of the seat cushion SC, does not cause a feeling of bottoming, and maintains a comfortable sitting comfort for the occupant.
[0040]
The spring force of each of the torsion bar springs 32 a and 32 b in the suspension mechanism 30 can be adjusted by rotating the handle portion 43 b of the operation shaft 43 constituting the spring force adjusting mechanism 40. 7 and 8 show the operating state of the spring force adjusting mechanism 40. FIG. 7 shows a state in which the spring force of each torsion bar spring 32a, 32b is adjusted to be weak, and FIG. 8 shows each torsion bar spring 32a, The state where the spring force of 32b is adjusted strongly is shown, respectively.
[0041]
The spring force adjusting mechanism 40 is in a state indicated by a solid line in FIG. 5 when the spring force of each of the torsion bar springs 32a and 32b is adjusted to be weak as shown in FIG. That is, in the spring force adjusting mechanism 40, the movable member 44 is at the front end position of the operation shaft 43, and the outer end portion of each swing arm 45 is rotated rearward. Accordingly, each operating arm 45 is in a non-rotating state and holds each rotating arm 41 in the state shown in FIG.
[0042]
In the spring force adjusting mechanism 40 in this state, when the handle portion 43b of the operation shaft 43 is rotated, the operation shaft 43 rotates. As a result, the movable member 43 moves backward to swing each swing arm 45 around the support pin 45a.
[0043]
Therefore, each swing arm 45 swings as indicated by a two-dot chain line in FIG. 5 and rotates its outer end portion forward, and each operation wire 46 is extended to attach the operating arm 42 to the support pin 42a. As shown in FIG. As a result, each rotating arm 41 connected to each operating arm 42 via the connecting pin 42b rotates in the clockwise direction around the support pin 41b, and is clamped by the clamp 41a in each torsion bar spring 32a, 32b. Lift the part that is being.
[0044]
Accordingly, the torsion bar springs 32a and 32b increase torsion by an amount corresponding to the lifted amount, thereby increasing the spring force of the torsion bar springs 32a and 32b against the seat cushion SC. The increase / decrease of the spring force with respect to the seat cushion SC of each torsion bar spring 32a, 32b corresponds to the rotation amount of each rotation arm 41, and this rotation amount eventually corresponds to the rotation operation amount of the handle portion 43b, By adjusting the amount of rotation of the handle portion 43b, the spring force of the torsion bar springs 32a and 32b on the seat cushion SC can be adjusted to a desired value.
[0045]
Therefore, in the vehicle seat according to the present invention, the spring force of the suspension mechanism 30 can be adjusted to a desired value by the action of the spring force adjusting mechanism 40, and a large weight difference is applied to the passenger sitting on the seat cushion SC. In other words, when the load on the seat cushion SC is greatly different, the spring force of the suspension mechanism 30 is changed by the spring force adjusting mechanism 40 to provide a comfortable cushioning property regardless of a large weight difference. Can do.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an example of a vehicle seat according to the present invention.
FIG. 2 is a perspective view of a cushion frame constituting the vehicle seat.
FIG. 3 is a perspective view showing a suspension mechanism and a spring force adjusting mechanism constituting the vehicle seat.
FIG. 4 is an exploded perspective view showing a seat track, a suspension mechanism, and a spring force adjusting mechanism constituting the vehicle seat.
FIG. 5 is a plan view showing the suspension mechanism and a spring force adjusting mechanism.
FIG. 6 is an operation explanatory diagram of the suspension mechanism.
FIG. 7 is a schematic side view showing an operating state (small spring force) of the suspension mechanism.
FIG. 8 is a schematic side view showing an operating state (large spring force) of the suspension mechanism.
FIG. 9 is a graph showing the relationship between the load on the seat cushion and the amount of deflection of the suspension mechanism.
[Explanation of symbols]
SC ... Seat cushion, SB ... Seat back, AR ... Armrest, 10 ... Cushion frame, 11 ... Frame body, 12, 13 ... Mounting arm, 20 ... Seat track, 21 ... Lower rail, 22 ... Upper rail, 23 ... Lock mechanism, 23a ...... Lock release lever, 24 ... Front bracket, 25 ... Rear bracket, 25a ... Stopper part, 26 ... Base plate, 26a ... Hook, 26b ... Bearing, 30 ... Suspension mechanism, 31 ... Rear link, 31a ... Support pin, 31b ... Long hole, 32a, 32b ... Torsion bar spring, 33 ... Front link, 33a ... Support pin, 34a, 34b ... Connecting rod, 34c ... Connecting arm, 34d ... Bracket, 35 ... Tension coil spring, 36a ... Connecting plate, 36b ... Connecting arm, 37 ... 40 ... Spring force adjusting mechanism, 41 ... Rotating arm, 41a ... Clamp, 41b ... Support pin, 41c ... Long hole, 42 ... Actuating arm, 42a ... Support pin, 42b ... Connection pin, 43 ... Operation shaft , 43a ... screw part, 43b ... handle part, 44 ... movable member, 45 ... swing arm, 45a ... support pin, 45b ... coupling pin, 46 ... operation wire.

Claims (4)

A vehicle seat having a suspension mechanism for receive a cushion frame, wherein the suspension mechanism includes a torsion spring, the tension spring larger spring force than the spring force of the torsion spring, a predetermined value load for the cushion frame The torsion spring exhibits a spring function when the load is less than 1, and both the torsion spring and the tension spring exhibit a spring function when the load on the cushion frame is equal to or greater than a predetermined value. The vehicle seat according to claim 1, further comprising a spring force adjusting mechanism that adjusts a spring force of a torsion spring constituting the suspension mechanism. 3. The vehicle seat according to claim 1, wherein the suspension mechanism includes a torsion bar spring having one end supported on the cushion frame side and the other end supported on the vehicle floor side, and left and right sides of the cushion frame. A rod supported at the end, a pair of left and right links rotatably supported at the lower end on the vehicle floor side and connected to the rod at the upper end, and one end connected to the vehicle floor side A vehicle seat characterized in that the other end is constituted by a tension coil spring connected to the torsion bar spring. 4. The vehicle seat according to claim 1, wherein the spring force adjusting mechanism is supported on the vehicle floor side so as to be pivotable in the vertical direction, and is a pivot arm that supports the torsion bar spring. An operating arm connected to the rotating arm and integrally rotating in the vertical direction when rotating, an operating shaft having an operating handle portion and supported rotatably on the vehicle floor side, and the operating shaft A movable member that advances and retreats by rotating, an oscillating arm whose middle part is rotatably supported by the cushion frame, and one end of which is connected to the movable member, and the other end of the oscillating arm and the operating arm. A vehicle seat characterized in that the vehicle seat is constituted by an operation wire.

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