JPH0716359Y2 - Elastic structure of vehicle seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an elastic structure of a vehicle seat, such as a seat cushion and a seat back that form a vehicle seat.

(Prior Art) As a type of elastic structure for vehicle seats
As shown in Japanese Patent No. 603, an elastic structure in which a seat pad is supported on a bottomed seat frame via a spring member and the seat frame and the seat pad are integrally covered with a skin material. There is.

(Problems to be solved by the invention) Generally, in this type of elastic structure, the skin material has breathability, but the seat pad has poor breathability and poor heat conductivity, and therefore, in the summer or during intense exercise. Occasionally, stuffiness may occur between the back seated person and the human body contact portion of the elastic structure, causing discomfort. Further, when the vehicle is parked outside during a hot season, the temperature inside the vehicle becomes high, and the seat itself also becomes high accordingly. Immediately after riding, the interior of the vehicle is cooled by the action of the cooler, but the elastic structure does not easily reach a low temperature, which may cause discomfort. In order to deal with this, the above-mentioned publication discloses an example in which a sheet which is an elastic structure is provided with a ventilation device.

The ventilation device includes a space portion formed between the seat cushion and the seat frame, and is provided in the seat frame to operate by a change in the volume of the space portion to allow air to flow into the space portion and to allow the air to flow from the space portion to the outside. It is composed of a valve that regulates the flow of air into the seat cushion and a communication hole provided in the seat cushion. Then, in the ventilation device,
The valve operates due to a change in the volume of the space when the vehicle is running, and air is supplied to the surface side of the seat cushion to prevent stuffiness of the human body. However, the ventilation device is always operated due to vibration or the like when the vehicle is running, and air is supplied to the front surface side of the seat cushion even when unnecessary. For this reason, when it is unnecessary to prevent the stuffiness of the human body, the operation of the ventilating device is rather adversely affected and the seated person is discomforted.

Therefore, an object of the present invention is to eliminate such a problem in an elastic structure.

(Means for Solving the Problems) The present invention is for a vehicle in which a seat pad is supported on a bottomed seat frame via a spring member and the seat frame and the seat pad are integrally covered with a skin material. In the elastic structure of the seat, the space between the seat frame and the seat pad is configured as a closed volume variable chamber, and the seat frame is closed when the variable chamber is compressed and expanded or decompressed. A check valve that opens and disconnects communication between the variable chamber and the outside and an on-off valve that manually or automatically opens and closes communication between the variable chamber and the outside are provided, and the seat pad includes the variable valve. A communication passage for communicating the chamber with the outer surface side of the elastic structure is provided.

(Operation and effect of the invention) In the elastic structure having such a configuration, when the occupant is seated and the occupant is in a stationary state when the on-off valve is closed, the spring member bends by a predetermined amount and the check valve is in the closed state. When the load on the spring member fluctuates due to the operation of the above or the vibration of the vehicle, the variable chamber expands and compresses according to this fluctuation to open and close the check valve. Therefore, in the elastic structure, when the on-off valve is closed, air flows into the variable chamber through the check valve, and the inflowing air flows out to the outer surface side of the elastic structure through the communication passage. To prevent stuffiness from coming into contact with the human body, and when the open / close valve is open, the variable chamber is open to the outside and the air in the variable chamber flows out to the outer surface side of the elastic structure. Is regulated. Therefore, by closing the on-off valve when it is necessary to prevent the seated person from getting damp, it is possible to prevent the air in the variable chamber from flowing to the outer surface side of the elastic structure to prevent the seated person from getting damp. In addition, it is possible to eliminate the discomfort to the occupant by opening the on-off valve when unnecessary and restricting the outflow of air in the variable chamber to the outer surface side of the elastic structure. .

(Embodiment) The first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a seat cushion 10 which is an elastic structure according to an embodiment of the present invention. The seat cushion 10
2 is a seat cushion of a vehicle seat shown in FIG. 2, which comprises a cushion frame 11, a cushion pad 12 and a seat cover 13 as shown in FIG.

The cushion frame 11 is a tray-shaped plate portion 11a with a bottom.
And a plurality of S springs 11b stretched on both side edges thereof, and a cushion pad 12 is placed thereon. The cushion pad 12 is elastically supported by the S spring 11b at its central portion, and its peripheral edge portion is supported by the peripheral edge portion of the plate portion 11a. In this state, the cushion pad 12 is integrally covered with the cushion frame 11 by the breathable seat cover 13, and together with these both 11 and 13, the seat cushion 10 is constituted. The seat cushion 10 is fixed to upper rails of a pair of left and right seat tracks 21 and 22, and a seat back 23 is attached to a rear end portion of the seat cushion 23 through a reclining mechanism, and together with the seat pack 23 forms a vehicle seat.

Thus, the space between the seat frame 11 and the seat pad 12 is formed in a sealed variable volume chamber R, and the seat frame 11
A check valve 14 and an on-off valve 15 are provided at the bottom of the seat pad 12, and the seat pad 12 is provided with a plurality of communication passages 12a that open to the outer periphery of the variable chamber R and the pad 12. The check valve 14 is provided so as to be opened inside the variable chamber R, and the opening / closing valve 15 is controlled to be opened / closed by a control device described later. In the variable chamber R, a load is applied to the seat cushion 10 and S
When the spring 11b is bent, it is compressed, and when the S spring 11b repeatedly expands and compresses due to the change in the load thereafter, the S spring 11b repeatedly expands and compresses accordingly.

Therefore, when the on-off valve 15 is closed, the check valve 14 is closed when the variable chamber R is compressed, and the air in the variable chamber R is ejected to the outer surface of the seat cushion 10 through each communication passage 12a. When the variable chamber R is expanded, the check valve 14 is opened, and the air flows into the variable chamber R through the check valve 14. As a result, stuffiness does not occur at the contact portion of the seat cushion 10 with the human body.

As shown in FIG. 4, the opening / closing valve 15 has a shutter base 15a,
It includes a shutter 15b, an electric motor 15c, a screw 15d, and a nut 15e. The shutter 15b is the shutter base 15a.
The upper surface of the valve is slidably mounted, and in the state shown in the figure, the on-off valve 15 is closed, and both openings 15a ₁ and 15b ₁ face each other by sliding in the direction of the arrow.
Is opened. The screw 15d is connected to the output shaft of the electric motor 15c, and the nut 1 fixed to the shutter 15b.
5e is screwed so that it can move back and forth. The electric motor 15c rotates forward and backward to slide the shutter 15b integrated with the nut 15e, and is drive-controlled by the control device 30 shown in FIG.

The control device 30 includes a selection switch 31, a temperature sensor 32, a first position sensor 33, a second position sensor 34, and a microcomputer 35.
And a drive control circuit 36. The selection switch 31 is a switch for selecting whether to open / close the on-off valve 15 automatically based on a predetermined temperature or on the basis of the occupant's intention. When not operated (neutral), automatic opening / closing control is selected. ,
Assuming that the closing control is selected when the pushing operation to one side (M = 1) and the opening control is selected when the pushing operation to the other side (M = 0), each selection signal is output. To do.
Both position sensors 33 and 34 are limit switches, the first position sensor 33 contacts the shutter 15b when the opening / closing valve 15 is closed and is turned on to output a fully closed state signal, and the second position sensor 34 is the opening / closing valve.
When the shutter 15 is opened, the shutter 15b is brought into contact with the shutter 15b to be turned on to output a fully opened signal. The microcomputer 35 includes a RAM, a CPU, a ROM and an interface I / O, which are connected to each other via a common bus. Selection switch 31 and each sensor 32
~ 34 are connected to the I / O of the microcomputer 35 and
A drive control circuit 36 is connected to / O. Drive control circuit
Reference numeral 36 controls drive of the electric motor 15c such as forward rotation, reverse rotation, and stop, based on the output signal from the microcomputer 35. A program for executing the flowchart shown in FIG. 6 is stored in the ROM of the microcomputer 35.

In the seat cushion 10, when the on-off valve 15 is closed, the function of preventing stuffiness is exerted as described above,
The same function is lost when the on-off valve 15 is opened. Also, open / close valve
15 is automatically controlled based on the flow chart of FIG. 6 by the will of the seated person or at a predetermined temperature (18 ° C.).

Then, when the ignition switch of the vehicle is turned on, the microcomputer 35 starts executing the program from step 40 of the flowchart. CPU is step 4
When the switch 31 is in the non-operation state (neutral), the selection state is determined based on the selection signal of the selection switch 31 in 1.
If YES is determined, the program proceeds to step 42. If the switch 31 is in the operating state, NO is determined and the program proceeds to step 43. The CPU determines the passenger compartment temperature based on the detection signal from the temperature sensor 32 in step 42,
If the vehicle interior temperature (T) is 18 ° C. or higher, YES is determined and the program proceeds to step 44. If the vehicle interior temperature is less than 18 ° C., NO is determined and the program proceeds to step 45. In step 44, the CPU determines the open / closed state of the open / close valve 15 based on the state signal from the first position sensor 33, and if the open / close valve 15 is in the fully closed state, determines YES and advances the program to step 46. In step 46, a stop signal is output to the drive control circuit 36, and the process returns to program step 41. If the on-off valve 15 is not in the fully closed state, the determination is NO and the program proceeds to step 47, where the drive control circuit 36 is operated.
A normal rotation drive signal is output to, and the program is returned to step 44 to execute the circulation processing. During this time, step
If YES in 44, the CPU steps through the program.
Proceeding to 46, a stop signal is output to the drive control circuit 36 in step 46, and the program is returned to step 41. This allows
The on-off valve 15 is held in a fully closed state, and the seat cushion 10 has a stuffiness preventing function.

If the passenger compartment temperature is below 18 ° C, the CPU returns NO in step 42.
If so, the program proceeds to step 45, and step 45
Based on the status signal from the second position sensor 34
If the open / close valve 15 is in the fully open state, the determination is YES and the program proceeds to step 46. In step 46, a drive stop signal is output to the drive control circuit 36 to execute the program in step 41. Return to. If the open / close valve 15 is not in the fully open state, it is determined to be NO and the program proceeds to step 48.
In step 48, the reverse drive signal is output to the drive control circuit 36, and the program is returned to step 45 to execute the circulation process. During this time, if YES is determined in step 45, the CPU advances the program to step 46, outputs a stop signal to the drive control circuit 36 in step 46, and returns the program to step 41. As a result, the opening / closing valve 15 is held in the fully opened state, and the seat cushion 10A has the stuffiness preventing function disabled.

On the other hand, when the selection switch 31 is in the operated state, the CPU determines NO in step 41, advances the program to step 43, and determines the selected state in step 43. When the seated person's intention of selection is closed, YES is determined and the program proceeds to step 44 to fully close the open / close valve 15. Further, when the seated person's intention of selection is open, NO is determined and the program proceeds to step 45 to fully open the open / close valve 15.
This allows the seat cushion to be
The stuffiness prevention function of 10A can be enabled or disabled.

Although the example of the seat cushion is shown in these embodiments, the present invention can be applied to the seat back of the vehicle seat, and the components of the opening / closing valve 15 are deformed when a predetermined temperature is reached. A shape memory alloy that opens and closes 15 may be adopted, which makes it possible to omit drive means such as an electric motor and control means.

[Brief description of drawings]

1 is a longitudinal sectional view of a seat cushion, which is an elastic structure according to an embodiment of the present invention, taken along line II in FIG.
2 is a perspective view of a vehicle seat equipped with the seat cushion, FIG. 3 is an exploded perspective view of the seat cushion, and FIG.
FIG. 5 is an enlarged perspective view of the on-off valve, FIG. 5 is a block diagram of the control device, and FIG. 6 is a flowchart of a program executed by the microcomputer. Explanation of code 10 …… Seat cushion, 11 …… Cushion frame,
12 …… Cushion pad, 12a …… Communication passage, 13 …… Seat cover, 14 …… Check valve, 15 …… Open / close valve, 15a ……
Shutter base, 15b ... Shutter, 15c ... Electric motor.

Claims (1)

[Scope of utility model registration request] 1. An elastic structure for a vehicle seat, comprising a seat pad supported on a bottomed seat frame via a spring member, and the seat frame and the seat pad integrally covered with a skin material. A closed volume variable chamber is formed between the seat frame and the seat pad, and the seat frame is closed when the variable chamber is compressed and opened when the variable chamber is expanded or decompressed. A check valve for connecting and disconnecting the variable chamber and an opening and closing valve for manually or automatically opening and closing the communication between the variable chamber and the outside are provided, and the variable chamber is provided on the seat pad outside the structure. An elastic structure for a vehicle seat, characterized in that a communication passage is provided on the front surface side for communication.