JP2009023627A - Compressed air supply system for vehicles - Google Patents

Abstract

To reduce the size and weight of a compressed air supply system, and to contribute to an increase in the loading space of a vehicle on which the compressed air supply system is mounted and the weight of a vehicle.
The basic idea of the present invention is to achieve the above object by omitting one of a plurality of air tanks. According to the present invention, by supplying compressed air necessary for the air pressure circuit for the parking brake from the air tanks for the first and second service brakes, the air tank for the parking brake can be omitted.
[Selection] Figure 1

Description

  The present invention relates to a compressed air supply system for use in a pneumatic circuit such as an air brake device or an air suspension device mounted on a vehicle.

  This type of compressed air supply system basically includes an air compressor that discharges compressed air and an air dryer that removes foreign substances such as moisture from the compressed air discharged by the air compressor. Furthermore, this type of compressed air supply system includes a multi-protection valve for improving the reliability of the air system on the downstream side of the air dryer. FIG. 3 shows a schematic diagram of a conventional compressed air supply system.

  In the compressed air supply system, the multi-protection valve 1 distributes the compressed air supplied from the air compressor 15 and passed through the air dryer 17 to the four air tanks 19a, 19b, 19c and 19d. Each of these air tanks 19a, 19b, 19c and 19d serves as a pressure air source of an air pressure circuit corresponding thereto. The air pressure circuits including the air tanks 19a, 19b, 19c and 19d have their respective roles. Of these, two air tanks 19a and 19b are used for the first and second service brakes, another air tank 19c is used for the parking brake, and another air tank 19d is used for the auxiliary equipment. The auxiliary air tank 19d may be omitted when the air capacity required by the air pressure circuit is small. However, the other air tanks 19a, 19b and 19c are generally indispensable components for the vehicle.

  The multi-protection valve 1 is a four-circuit protection valve, and includes four protection valves corresponding to each air pressure circuit. Even if one of these air pressure circuits fails, the failed air By closing the protective valve corresponding to the pressure circuit, it functions to protect other non-defective air pressure circuits. Further, from the viewpoint of further safety, the multi-protection valve 1 is provided in the parking tank air tank 19c when the air pressure inside the air tanks 19a, 19b for the first and second service brakes does not reach a predetermined value. The pressure supply to the air tank 19c is stopped by closing the corresponding protective valve. Normally, the service brake operates the braking force by the supplied air pressure. On the other hand, the parking brake is a spring brake using a biasing force of a spring, and releases the braking force by supplied air pressure. The multi-protection valve 1 stops the pressure supply to the parking brake air tank 19c when the service brake cannot be operated because the air pressure of the air tanks 19a, 19b for the first or second service brake is not sufficient. The parking brake cannot be released.

  Incidentally, a vehicle equipped with such a compressed air supply system is required to increase the loading space and reduce the weight of the vehicle body. Under these circumstances, each air tank 19a, 19b, 19c, 19d generally requires a large installation space and is heavy compared to other pneumatic equipment. Therefore, if even one of these air tanks 19a, 19b, 19c, 19d can be omitted, it is very effective in meeting the above requirements. The present invention has been made in view of these problems, and an object of the present invention is to provide a technique that is effective in reducing the size and weight of a compressed air supply system.

  The basic idea of the present invention is to reduce the size and weight of a compressed air supply system by omitting one of a plurality of air tanks, and to increase the loading space of a vehicle equipped with this compressed air supply system. This contributes to the reduction of vehicle weight and weight. The inventors of the present invention have considered omitting the air tank in the air pressure circuit by supplying compressed air necessary for one air pressure circuit from another air tank.

  The vehicle compressed air supply system of the present invention outputs an air compressor that discharges compressed air, an air dryer that removes foreign matters such as moisture from the compressed air discharged by the air compressor, and compressed air that has passed through the air dryer. And three output ports from a first output port to a third output port. A branch chamber is formed between the air dryer and each output port. Further, the compressed air supply system for a vehicle according to the present invention includes a first protection valve provided corresponding to the first output port in the flow path from the branch chamber to the first output port, and the first protection valve provided from the branch chamber. A second protective valve provided corresponding to the second output port in the flow path leading to the second output port, and provided corresponding to the third output port in the flow path extending from the branch chamber to the third output port. And a third protective valve. These first to third protection valves have a function corresponding to each protection valve of the multi-protection valve in the prior art, and each air pressure connected from the corresponding first output port to the third output port. It closes when the circuit fails. The vehicle compressed air supply system of the present invention is provided with an air supply passage connecting the upstream side of the third protection valve and the third output port so as to bypass the third protection valve, and the air supply passage. And a check valve that prevents the flow of air from the third output port toward the branch chamber. The first output port is connected to a first air tank, and the second output port is connected to a second air tank. The air supply passage enables the compressed air of the first air tank and / or the second air tank to be supplied to the third output port through the branch chamber when the third protection valve is closed. According to the present invention, the compressed air stored in the first air tank and / or the second air tank can be output from the third port through the air supply passage that bypasses the third protection valve.

  A pressure reducing valve can be provided in the flow path from the branch chamber to the third protection valve, upstream of the air supply passage. The pressure reducing valve is closed when the air pressure of the first air tank and / or the second air tank does not reach a predetermined value, thereby blocking the flow path from the branch chamber to the third output port. Configure. As described above, when the air pressure of the first air tank and / or the second air tank does not reach the predetermined value, the pressure reducing valve disposed on the upstream side of the air supply passage is forcibly closed, so that the third port The output of compressed air can be stopped.

  Further, when the air pressure in the first air tank and / or the second air tank does not reach a predetermined value, the check valve disposed in the air supply passage is closed instead of closing the pressure reducing valve, and this air supply is performed. It is also possible to block the passage. According to the present invention, the compressed air stored in the first air tank and the second air tank can be output from the third port through the air supply passage that bypasses the third protection valve, and the first air tank and / or the second air tank is also provided. When the air pressure does not reach the predetermined value, the check valve disposed in the air supply passage is forcibly closed, whereby the output of compressed air from the third port can be stopped.

  According to the present invention, compressed air output from the third port is supplied from an air tank connected to another port (a first air tank connected to the first port and / or a second air tank connected to the second port). Thus, it is not necessary to connect an independent air tank to the third port. Therefore, the air tank can be omitted compared to the conventional system, and the compressed air supply system can be reduced in size and weight, contributing to an increase in the loading space of the vehicle on which the compressed air supply system is mounted and the weight of the vehicle. it can.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of a vehicular compressed air supply system 100 according to a first embodiment of the present invention. The compressed air supply system 100 includes an air compressor 112 that discharges compressed air, and an air dryer module 126 that includes a function of removing foreign matter in the compressed air.

  The outlet 116 of the air compressor 112 is connected to the inlet 132 of the air dryer module 126. The air dryer module 126 includes a dryer 139 as an air dryer that contains a recyclable desiccant. Further, a drain valve 135 is provided on the primary side of the dryer 139. The drain valve 135 is opened in accordance with the purge command pressure, and the compressed air dried on the secondary side of the dryer 139 is caused to flow back into the dryer 139 to regenerate the desiccant in the dryer 139. To do.

  The air dryer module 126 has four output ports 21, 22, 23, and 24 in order to correspond to four air pressure circuits including an air brake device circuit and an auxiliary machine circuit. The first output port 21 is connected to an air pressure circuit for a first service brake including a first air tank. The second output port 22 is connected to an air pressure circuit for a second service brake including a second air tank. The third output port 23 is connected to the parking brake air pressure circuit, and the fourth output port is connected to the auxiliary air pressure circuit. A branch chamber 134 is formed between the dryer 139 and each output port 21, 22, 23, 24. A first protective valve 11 corresponding to the first output port 21 is provided in the flow path from the branch chamber 134 to the first output port 21. A second protective valve 12 corresponding to the second output port 22 is provided in the flow path from the branch chamber 134 to the second output port 22. A third protective valve 13 corresponding to the third output port 23 is provided in the flow path from the branch chamber 134 to the third output port 23. A pressure reducing valve RV2 is provided in the middle of the passage connecting the branch chamber 134 and the third protection valve 13. A passage branched from the passage connecting the pressure reducing valve RV <b> 2 and the third protection valve 13 extends toward the fourth output port 24. A fourth protection valve 14 corresponding to the fourth output port is provided in the flow path toward the fourth output port. An air supply passage 17 that branches from the passage connecting the pressure reducing valve RV2 and the third protection valve 13 and bypasses the third protection valve 13 extends. The air supply passage 17 connects the upstream side of the third protection valve 13 and the third output port 23. The air supply passage 17 includes a check valve 17c that prevents an air flow from the third output port 23 toward the branch chamber 134 (that is, a backflow of air), and a throttle 17v arranged in series with the check valve 17c. Have

  Each protection valve (the first protection valve 11, the second protection valve 12, the third protection valve 13 and the fourth protection valve 14) has a function corresponding to each protection valve of the multi-protection valve in the prior art, and corresponds to each. It closes when each air pressure circuit connected to the output ports (the first output port 21, the second output port 22, the third output port 23, and the fourth output port 24) fails. The first protection valve 11 and the second protection valve 12 are open when the air pressures of the corresponding air pressure circuits for the first and second service brakes are sufficiently satisfied. Therefore, the compressed air of the first air tank and the second air tank stored for the first and second service brakes can be supplied from the third port 23 to the parking brake air pressure circuit through the air supply circuit 17. In this embodiment of the present invention, the pressure reducing valve RV2 is closed from the branch chamber 134 to the third output port 23 when the air pressure of the first air tank and the second air tank does not reach a predetermined value. Block the flow path to reach. By forcibly closing the pressure reducing valve RV2, the output of compressed air from the third port 23 can be stopped. Thus, when the service brake cannot be operated because the air pressure of the service brake circuit is not sufficient, the supply of pressure to the parking brake circuit is stopped so that the parking brake cannot be released. Opening and closing of the pressure reducing valve RV2 is controlled by a command pressure from the solenoid valve SV3. The solenoid valve SV3 is controlled by an electronic control circuit 138. The electronic control circuit 138 includes a first pressure sensor 156 that detects the air pressure of the first output port 21 (first air tank) and a second pressure sensor 157 that detects the air pressure of the second output port 22 (second air tank). Based on the output, the solenoid valve SV3 is controlled.

  FIG. 2 is a circuit diagram of a compressed air supply system 200 according to the second embodiment of the present invention. This compressed air supply system 200 differs from that shown in FIG. 1 when the air pressure at the first output port 21 (first air tank) and the second output port 22 (second air tank) does not reach a predetermined value. Instead of closing the pressure reducing valve RV2, the check valve 217c disposed in the air supply passage 217 is closed to shut off the air supply passage 217. Therefore, the difference from the first embodiment shown in FIG. 1 is that the valve that receives the command pressure from the solenoid valve SV3 and its blocking position are different. Except for this point, the compressed air supply system 200 has basically the same configuration as the compressed air supply system 100 shown in FIG. Therefore, basically the same components as those shown in FIG. 1 are denoted by the same reference numerals in FIG. 2, and detailed description thereof is omitted here. Also with this compressed air supply system 200, the compressed air stored in the first air tank and the second air tank can be output from the third port 23 through the air supply passage 217, and the air pressure of the first air tank and the second air tank can be output. When the air pressure does not reach the predetermined value, the check valve 217c disposed in the air supply passage 217 is forcibly closed, whereby the output of compressed air from the third port 23 can be stopped.

1 is a circuit diagram of a compressed air supply system according to a first embodiment of the present invention. The circuit diagram of the compressed air supply system which is 2nd embodiment which concerns on this invention Circuit diagram of compressed air supply system according to the prior art

Explanation of symbols

11 First protection valve 12 Second protection valve 13 Third protection valve 14 Fourth protection valve 17, 217 Air supply passages 17c, 217c Check valve 21 First output port 22 Second output port 23 Third output port 24 Fourth output Port 100, 200 Compressed air supply system 112 Air compressor 134 Branch chamber 139 Dehumidifier (air dryer)
RV2 pressure reducing valve

Claims (3)

  A third output from an air compressor that discharges compressed air, an air dryer that removes foreign substances such as moisture from the compressed air discharged by the air compressor, and a first output port that outputs compressed air that has passed through the air dryer Three output ports up to the port, a branch chamber formed between the air dryer and each output port, and a passage extending from the branch chamber to the first output port, corresponding to the first output port. A first protection valve provided, a second protection valve provided corresponding to the second output port in a flow path from the branch chamber to the second output port, and from the branch chamber to the third output port. A third protective valve provided corresponding to the third output port in the flow path leading to the upstream side of the third protective valve and the third output port so as to bypass the third protective valve A supply passage and a check valve provided in the air supply passage to prevent the flow of air from the third output port to the branch chamber, and the first output port is connected to the first air tank. And the second output port is connected to a second air tank, and the air supply passage branches the compressed air of the first air tank and / or the second air tank when the third protection valve is closed. A compressed air supply system for a vehicle, characterized in that supply to the third output port is possible through a chamber.   A flow path from the branch chamber to the third protection valve, and a pressure reducing valve is provided upstream of the air supply passage, and the pressure reducing valve is an air pressure of the first air tank and / or the second air tank. 2. The compressed air supply system for a vehicle according to claim 1, wherein when the air pressure does not reach a predetermined value, the flow path from the branch chamber to the third output port is shut off by closing the valve. 2. The compressed air supply for vehicles according to claim 1, wherein when the air pressure of the first air tank and / or the second air tank does not reach a predetermined value, the check valve closes the air supply passage by closing the check valve. system.

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