JPH06257562A - Pneumatic device of vehicle - Google Patents

Abstract

PURPOSE:To provide a device by which compressed air can be obtained through simple constitution in a vehicle. CONSTITUTION:A return passage 16 from a power cylinder 14 in a vehicle hydraulic power steering mechanism 10 is communicated to one of the cylinder chambers 25 of a pneumatic-to-hydraulic pressure converter 20 by an oil passage 26 and the other cylinder chamber 31 is provided with a suction port 33 communicated to the atmosphere and with a delivery port 36 for connection to an air tank, and fluctuation of hydraulic pressure within the return passage 16, caused by operation of the hydraulic power steering mechanism 10, causes operation of the piston 22 of the pneumatic-to-hydraulic pressure converter 20, so discharging compressed air from the delivery port 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for easily obtaining compressed air in a vehicle.

[0002]

2. Description of the Related Art In a conventional vehicle, as shown in FIG. 4, a hollow weather strip 3 is arranged between a door 1 and a vehicle body 2 such as a roof or a pillar, and an air compressor 4 is provided. The compressed air obtained by
The air is supplied to the hollow portion of the weather strip 3 via the supply / exhaust valve 6, the pressure switch 7, the joint 8, the quick exhaust valve 9 and the like, and the weather strip 3 expanded by the pressure of the compressed air causes the door 1 and the vehicle body 2 to reach each other. In addition to preventing rainwater from entering the inside of the vehicle from between, it actively prevents noise from the inside and outside of the vehicle and prevents the intake of air inside the vehicle due to aerodynamic effects while the vehicle is running. It is unavoidable that the expensive dedicated air compressor 4 and its driving energy are required.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus capable of efficiently obtaining compressed air in a vehicle with a simple structure.

[0004]

Therefore, the pneumatic device for a vehicle according to the present invention includes a cylinder in which a piston is slidably accommodated, one chamber in the cylinder defined by the piston, and a fluid pressure power. A flow path communicating with the return side from the power cylinder in the steering mechanism,
And an intake port and a discharge port, each of which is provided with a check valve and communicates with the other chamber in the cylinder defined by the piston.

[0005]

In other words, the fluid pressure on the return side from the power cylinder fluctuates as the pressure fluid is supplied to and discharged from the power cylinder in the fluid pressure power steering mechanism in response to steering of the vehicle. The pressure in one chamber in the cylinder that communicates with the return side also fluctuates, so that the air sucked into the other chamber in the cylinder from the intake port is compressed via the piston and discharged from the discharge port as compressed air. Because it is done
Compressed air required for vehicles and the like can be easily obtained.

[0006]

Embodiments of the present invention will be described below by assigning the same reference numerals to the same parts. 1 and 2,
In the hydraulic power steering mechanism 10 of the vehicle, the oil pump 12 is driven by the vehicle-mounted engine 11 and the pump 12
The pressure oil supplied from the front wheel 1 is guided to the power cylinder 14 via a switching valve (not shown) in the gear box 13.
While the steering force of 5 is applied, the oil discharged from the power cylinder 14 passes through the switching valve 13, the return passage 16, and the throttle valve 17 in the passage 16 to be returned to the oil reservoir 18.

On the other hand, the pneumatic-hydraulic converter 20 installed in the vehicle
The piston 22 is slidably accommodated in the cylinder 21, and the spring 24 is provided between the end surface of the cylinder 21 and the end of the piston rod 23. Oil chamber 26
Is connected to the return passage 16 by an oil passage 28 provided with a throttle valve 27.
Is in communication with. It should be noted that the outer peripheral surface of the piston 22 has a sealing member 22a that seals the inner peripheral surface of the cylinder 21.
Is attached to the inner peripheral surface of the opening of the wall of the cylinder 21 through which the piston rod 23 penetrates.
3a is attached. Further, in the other chamber 31 in the cylinder 21 partitioned by the piston 22, the check valve 32
Intake port 33 connected to the atmosphere through a check valve 3
Discharge port 36 connected to the pressure control valve 35 via 4
And an air tank 37 and a supply / exhaust valve 38 are installed on the downstream side of the pressure control valve 35.
Is connected to a hollow portion of a pressing member made of a rubber-like elastic body arranged along a vehicle door (not shown) and a vehicle body such as a roof or a pillar.

When the engine 11 is first started to drive the vehicle, the oil pump 1 of the power steering mechanism 10 is started.
2 is driven by the engine 11 and the hydraulic pressure in the return passage 16 immediately rises to about 2 kg / cm 2 so that this hydraulic pressure is transmitted to the cylinder chamber 25 through the oil passage 26 and the piston 22 compresses the spring 24. While sliding in the cylinder 21 to the left in FIG. 2 and displacing to the initial position indicated by the chain double-dashed line, the pressurized air in the cylinder chamber 31 pushes the check valve 34 open to open it. Part of discharge port 3
It is discharged from 6 and 1.5 kg / c by the pressure control valve 35.
The pressure is adjusted to m square. At this time, when the vehicle door is closed, the air supply / exhaust valve 38 is opened, the hollow portion of the pressing member arranged along the vehicle door and the vehicle body is communicated with the discharge port 36, and the pressing member is connected. A portion of the air required to completely fill the hollow part is delivered,
The pressing member is inflated to some extent.

After that, the power steering mechanism 10 is activated each time a steering operation is performed as the vehicle travels, and the hydraulic pressure in the return passage 16 is temporarily changed, for example, to 5 k.
Since the hydraulic pressure rises to g / cm2, this oil pressure
Is transmitted to the cylinder chamber 25 through the cylinder 22, and the piston 22 further compresses the spring 24 from the initial position while the cylinder 21
Since the inside slides to the left in FIG. 2, the air in the cylinder chamber 31 is further pressurized to open the check valve 34, and compressed air is discharged from the discharge port 36 to the pressure control valve 35 and the air tank 37.
And is supplied to the hollow portion of the pressing member through the supply / exhaust valve 38.

When the hydraulic pressure in the return passage 16 is reduced to about 2 kg / cm 2 of the original pressure, the hydraulic pressure in the cylinder chamber 25 is also reduced, and the piston 22 is returned to the initial position by the spring force of the spring 24. If the check valve 34 closes and the inside of the cylinder chamber 31 becomes negative pressure accordingly, the check valve 3
2 is opened, and the air at the atmospheric pressure is replenished from the intake port 33 into the cylinder chamber 31. Therefore, by repeating these operations, the air tank 37 and the hollow portion of the pressing member are filled with the compressed air, so that the pressing member strongly expands the space between the vehicle door and the vehicle body by its expansion,
Similar to the conventional weather strip, it can prevent rainwater from entering, sound insulation from inside and outside the vehicle, or suction of air inside the vehicle. It is also possible to enhance the rigidity of the entire vehicle by strengthening the vehicle door and the vehicle body. Further, when the vehicle is stopped and the vehicle door is opened, the air in the hollow portion of the pressing member is once evacuated by the air supply / exhaust valve 38, and then the vehicle door is closed again, the compressed air stored in the air tank 37 is compressed. By supplying air to the hollow portion of the pressing member, the above-mentioned operation of the pressing member can be performed quickly.

In the above device, since the air-hydraulic converter 20 is operated by utilizing the back pressure fluctuation generated in the return passage 16 of the power steering mechanism 10 every time the steering operation is performed, the original steering by the power steering mechanism 10 is performed. It is possible to easily obtain air at a predetermined pressure with good energy efficiency and to reliably operate the pressing member without any loss of function, and at the same time, it is possible to reduce costs by eliminating the need for an expensive air compressor. .

Since the normal steering operation is frequently performed when the vehicle is traveling, the pneumatic-hydraulic converter also frequently operates in response to the operation of the power steering mechanism, and compressed air can be obtained considerably quickly. Even if the air tank has a small capacity or is omitted, there is no particular problem in practical use. In addition, the compressed air obtained by the pneumatic-hydraulic converter as described above is used to expand the pressing member arranged between the vehicle door and the vehicle body, and is also used for adjusting or supplementing tire pressure. It goes without saying that it can also be used.

Next, another embodiment of the present invention shown in FIG. 3 will be described. The pneumatic-hydraulic converter 40 equipped on the vehicle is
A first cylinder 46 and a second cylinder 44, which are arranged apart from each other, respectively, and a first piston 46 and a second piston 48, which are slidably accommodated in the cylinders 42 and 44, are connected by a piston rod 50, A spring 54 is provided between the seat plate 52 fixed to the rod 50 and the end surface of the first piston 46.

An intake port 60 connected to the atmosphere via a check valve 58 and a pressure control via a check valve 62 are provided in one chamber 56 in the first cylinder 42 defined by the first piston 46. A discharge port 64 connected to the valve 35 is in communication with each other, and an air tank 37 and a supply / exhaust valve 38 are installed on the downstream side of the pressure control valve 35 as in the above-described embodiment, while the first cylinder 42 is provided. The other chamber 66 in the
The opening 68 provided at a predetermined position of the first cylinder 42 prevents the first piston 46 from being hindered from being smoothly communicated with the atmosphere and generating a negative pressure in the chamber 66. A seal member 70 is mounted on the outer peripheral surface of the first piston 46 to seal the space between the outer peripheral surface of the first piston 46 and the inner peripheral surface of the first cylinder 42.

Further, one chamber 72 in the second cylinder 44 defined by the second piston 48 communicates with the return passage 16 by an oil passage 74, and the throttle valve 27
A seal member 78, which communicates with the oil reservoir 18 by an oil passage 76 having the above, and which seals between the inner peripheral surface of the second cylinder 44 and the outer peripheral surface of the second piston 48, A similar seal member 80 is attached to the inner peripheral surface of the opening of the wall portion of the second cylinder 44 through which the piston rod 50 penetrates. On the other hand, the other chamber 82 in the second cylinder 44 is connected to the throttle valve 27 of the oil passage 76 by the oil passage 84.
It communicates with the downstream side, and cannot be completely sealed by the seal member 78, so that the cylinder chamber 72 to the cylinder chamber 82 cannot be completely sealed.
Oil flowing into the oil reservoir 1 via the oil passage 84.
It can be returned to 8.

When the engine 11 is first started to drive the vehicle, the oil pump 1 of the power steering mechanism 10 is started.
2 is driven by the engine 11, and the hydraulic pressure in the return passage 16 immediately rises to about 2 kg / cm 2 so that this hydraulic pressure acts on one chamber 72 in the second cylinder 44 through the oil passage 74. Causes the second piston 48
When the second cylinder 44 slides to the left in FIG. 3 while compressing the spring 54, the first piston 46 connected to the second piston 48 by the piston rod 50 simultaneously moves to the first piston 46.
Sliding in the cylinder 42 to the left in FIG.
As a result of the displacement of 6, 48 to the initial position shown by the chain double-dashed line, the pressurized air in the cylinder chamber 56 pushes open the check valve 62 and a part of the air is discharged from the discharge port 64, and the pressure control valve This pressurized air is fed to the hollow portion of the pressing member through 35.

After that, each time the steering operation is performed as the vehicle travels, the power steering mechanism 10 is activated, and the hydraulic pressure in the return passage 16 rises each time, so that both pistons 46 and 48 are further springed from their initial positions. 3 slides to the left in FIG. 3 while compressing 54, the air in the cylinder chamber 56 is further pressurized to push open the check valve 62, and compressed air is discharged from the discharge port 64 to the pressure control valve 35 and the air tank 37.
And is supplied to the hollow portion of the pressing member through the supply / exhaust valve 38.

When the hydraulic pressure in the return passage 16 is reduced to about 2 kg / cm2, the hydraulic pressure in the cylinder chamber 72 is also reduced. Therefore, the spring force of the spring 54 causes both pistons 46 and 48 to be initialized. When it is returned to the position, the check valve 62 is pushed back and closed by the pressure in the discharge port 64, and the check valve 58 is closed if the inside of the cylinder chamber 56 becomes negative pressure.
Is opened, and air of approximately atmospheric pressure is replenished from the intake port 60 into the cylinder chamber 56.

In this embodiment, in addition to the same operational effects as the above-mentioned embodiment, the first cylinder 4
Since the second and second cylinders 44 are arranged apart from each other, it is possible to completely prevent oil from being mixed into the compressed air fed to the hollow portion of the pressing member, and at the same time,
The other chamber 82 in the cylinder 44 communicates with the return passage 16 through the oil passage 74, and even if oil enters the cylinder chamber 82, the oil passes through the oil passages 84 and 76 and flows into the oil reservoir 18. Since the seal member 78 is returned, it is not necessary to completely seal the seal member 78. Therefore, it is possible to reduce the sealing performance and reduce the sliding resistance of the seal member 78 with respect to the second cylinder 44. The second piston 48 can easily follow the hydraulic pressure fluctuations on the return passage 16 side and slide easily, thereby improving the mechanical efficiency of the compressor.

Although the first cylinder and the second cylinder are separated from each other in this embodiment,
The cylinder is divided into three cylinders by the two partition walls, and the two pistons connected by the rods are housed in the cylinders on both sides, respectively, so that the positioning work of both cylinders can be omitted, and their attachment can be performed. It is also possible to divide the two integrated cylinders by one partition wall and arrange the return spring of the piston in either cylinder. In either case, The same effects and advantages as those of the above-mentioned respective embodiments can be obtained.

[0021]

In the pneumatic device for a vehicle according to the present invention, the return side fluid pressure of the fluid pressure power steering mechanism, which fluctuates according to the steering of the vehicle, is used to operate the piston in the cylinder to operate the cylinder. Since compressed air is discharged from the discharge port, compressed air can be easily obtained without any expensive air compressor, and energy loss of the vehicle can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic layout diagram in an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the above embodiment.

FIG. 3 is a layout view of essential parts in another embodiment of the present invention.

FIG. 4 is an overall perspective view of a conventional device.

[Explanation of symbols]

 10 Hydraulic Power Steering Mechanism 12 Oil Pump 14 Power Cylinder 16 Return Passage 18 Oil Reservoir 20 Pneumatic Hydraulic Converter 21 Cylinder 22 Piston 24 Spring 33 Intake Port 35 Pressure Control Valve 36 Discharge Port 38 Supply / Exhaust Valve 40 Pneumatic Hydraulic Converter 42 1st Cylinder 44 Second cylinder 46 First piston 48 Second piston 54 Spring 60 Intake port 64 Discharge port 68 Opening 74 Oil passage 76 Oil passage

Claims (1)

[Claims] 1. A cylinder in which a piston is slidably accommodated, a flow path which connects one chamber in the cylinder defined by the piston and a return side from a power cylinder in a fluid pressure power steering mechanism, and A pneumatic device for a vehicle, comprising an intake port and a discharge port, each of which is provided with a check valve in communication with the other chamber in the cylinder defined by the piston.