CN210971033U - Commercial vehicle binary channels ABS rear axle brake module assembly - Google Patents

Abstract

The utility model relates to the technical field of air pressure braking systems for commercial vehicles, in particular to a dual-channel ABS rear axle braking module assembly for commercial vehicles, which comprises an intermediate valve body assembly and two ABS solenoid valves. The intermediate valve body assembly is composed of a valve cover and a valve body. The valve cover is provided with a piston. The valve body is provided with an inlet ring groove, an outer inlet ring groove and a valve control mechanism. The inner inlet ring groove is connected with the air inlet, and the outer The inlet ring groove is connected with the two outlet channels. Each outlet channel is connected to an ABS solenoid valve. The utility model can realize the functions of accelerating the braking response speed of the rear axle and braking the left and right wheels to prevent locking. The utility model can effectively save the assembly space, facilitate the arrangement of the parts of the whole vehicle, and has a high integration degree, which can simplify the pipeline connection process, improve the assembly efficiency, improve the air tightness of the braking system, and reduce the weight and cost. The ABS solenoid valves on both sides can be disassembled separately for easy inspection and maintenance.

Description

A dual-channel ABS rear axle braking module assembly for commercial vehicles

technical field

The invention relates to the technical field of air pressure braking systems for commercial vehicles, in particular to a dual-channel ABS rear axle braking module assembly for commercial vehicles.

Background technique

The full name of ABS system is Anti-lock Brake System, which is called Anti-lock Brake System in Chinese. A safety control system capable of shortening the braking distance. The ABS solenoid valve is an executive component in the ABS system, and one for each wheel is generally used in commercial vehicles.

The relay valve is a device used to speed up the braking response speed of the rear axle. Generally, it has one control air port, one air supply port and two air outlets. The control air port is connected to the brake pedal device, the air supply port is connected to the high-pressure air storage cylinder, and the air outlet is generally connected to the brake air chamber through the ABS solenoid valve.

The rear axle braking module of a general commercial vehicle consists of a relay valve and two ABS solenoid valves. There are generally two technical solutions for the rear axle relay valve and the ABS solenoid valve in the prior art. A technical solution is to use one relay valve and two ABS solenoid valves, which are dispersedly arranged on the frame near the brake air chamber. This technical solution has the problems of a large number of parts and a complicated pipeline, many leakage risk points and low assembly efficiency. Another technical solution is to combine a relay valve and two ABS solenoid valves through a transition joint and arrange them on the frame beam. This technical solution is relatively bulky and poorly integrated.

SUMMARY OF THE INVENTION

The utility model proposes a dual-channel ABS rear axle brake module for commercial vehicles, which has a simple structure, can effectively reduce the number of parts and components, reduce the cost and weight of the entire vehicle, and at the same time improves assembly efficiency, reduces the risk point of leakage of pipe joints, and improves air tightness. The assembly overcomes the above-mentioned problems existing in the existing commercial vehicle rear axle braking module.

The technical solution of the present utility model is described as follows in conjunction with the accompanying drawings:

A dual-channel ABS rear axle brake module assembly for a commercial vehicle, comprising an intermediate valve body assembly 1 and two ABS solenoid valves with the same structure, the two ABS solenoid valves with the same structure are arranged on the left side of the intermediate valve body assembly 1. The left ABS solenoid valve 2 and the right side ABS solenoid valve 3 arranged on the right side of the intermediate valve body assembly 1; Air port 11, the upper part of the middle valve body assembly 1 is provided with a control air port 14 for controlling the connection or disconnection of the air inlet 11 with the left ABS solenoid valve 2 and the right ABS solenoid valve 3, and the left side of the middle valve body assembly 1 is provided There is a left air outlet 121 that communicates with the left ABS solenoid valve 2, the right side of the intermediate valve body assembly 1 is provided with a right air outlet 122 that communicates with the right ABS solenoid valve 3, and the lower part of the intermediate valve body assembly 1 is provided with a The exhaust port 13 communicated with the exhaust muffler 4; the intermediate valve body assembly 1 is composed of a valve cover 15 and a valve body 16; the valve cover 15 is provided with a valve control mechanism; the valve body 16 is provided with a valve inside An inner air inlet ring groove 111 and an outer air inlet ring groove 112; the inner air inlet ring groove 111 is communicated with the air inlet 11; the outer air inlet ring groove 112 is respectively connected with the left ABS solenoid valve 2 and the right ABS The solenoid valve 3 is connected; the valve body 16 is provided with a valve mechanism for controlling the communication between the outer inlet ring groove 112 and the inner inlet ring groove 111 or the exhaust port 13, and the movement of the valve mechanism is controlled by the valve control mechanism; The valve body 16 is provided with two inlet ring grooves 501 , two inlet passages 113 , two outlet ring grooves 504 and two exhaust passages 505 ; the two inlet ring grooves 501 pass through two The intake channel 113 is communicated with the outer intake ring groove 112 , the two exhaust channels 505 are both communicated with the exhaust port 13 , and one is provided between the two intake ring grooves 501 and each set of intake channels 113 for controlling The pressure-maintaining diaphragm mechanism for the connection or disconnection between the inlet ring groove 501 and the group of inlet passages 113; the two groups of the inlet passages 113 are respectively connected with an outlet ring groove 504, and each outlet ring groove 504 is connected to An exhaust channel 505 is communicated with each other, and each air outlet ring groove 504 is communicated with the left air outlet 121 and the right air outlet 122 respectively; between each air outlet channel 505 and the corresponding air outlet ring groove 504, there is an air outlet for controlling the air outlet. A pressure reducing diaphragm mechanism for communicating or disconnecting the exhaust passage 505 and the corresponding air outlet ring groove 504; a pressure maintaining diaphragm mechanism for controlling the pressure maintaining diaphragm mechanism is provided between the outer air inlet ring groove 112 and the pressure maintaining diaphragm mechanism The pressure maintaining passage in the ABS solenoid valve is set on the pressure maintaining passage to control the connection or disconnection of the pressure maintaining passage; between the outer air inlet ring groove 112 and the pressure reducing diaphragm mechanism There is a decompression passage for controlling the decompression diaphragm mechanism, and the decompression solenoid valve 202 in the ABS solenoid valve is arranged on the decompression passage to control the connection or disconnection of the decompression passage; wherein, the pressure maintaining solenoid The valve 201 is normally open, and the pressure reducing solenoid valve 202 is normally closed; the control The air port 14 is connected with the air outlet of the external brake valve, the air inlet 11 is connected with the external air storage cylinder, the left air outlet 121 is connected with the external left brake air chamber, and the right air outlet 122 is connected with the external right brake air chamber. Air chamber connection.

The valve control mechanism is composed of a guide rod 151 on the valve cover 15, a piston assembly 152 and a control cavity 141; wherein, the control cavity 141 is communicated with the control air port 14, and the piston assembly 152 moves up and down along the guide rod 151; the valve The mechanism is composed of a valve seat 161, a valve 162, a valve return spring 163 and a spring seat 164; the valve 162 is closely attached to the valve seat 161 under the action of the valve return spring 163; the valve return spring 163 is fixed on the on the spring seat 164.

Each group of intake passages 113 in the intermediate valve body assembly 1 is formed by a first intake passage 502 and a second intake passage 503 communicating with each other; the intake ring groove 501 communicates with the first intake passage 502 , the second air inlet 503 communicates with the air outlet ring groove 504 .

The ABS solenoid valve also includes a base plate assembly 203, a connector assembly 204 that is connected to an external vehicle ABS controller and controls the pressure-maintaining solenoid valve 201 and the pressure-reducing solenoid valve connection 202, and a housing 205; the housing 205 The part close to one side of the middle valve body is the shell back plate 206; the connector assembly 204 is enclosed in the shell 205 together with the pressure maintaining solenoid valve 201 and the pressure reducing solenoid valve 202; the bottom plate assembly 203 is located in the shell between the back plate 206 and the intermediate valve body assembly 1; the casing back plate 206 and the bottom plate assembly 203 and the intermediate valve body assembly 1 are fixedly connected by bolts; the pressure maintaining solenoid valve 201 is blocked by the pressure maintaining solenoid valve cover 211, The pressure maintaining valve 212, the pressure maintaining moving iron core spring 213, the pressure maintaining moving iron core 214, the pressure maintaining coil winding 215 and the pressure maintaining static iron core 216 are connected in sequence; the pressure reducing solenoid valve 202 is covered by the pressure reducing solenoid valve 221, a pressure reducing valve 222, a pressure reducing moving iron core spring 223, a pressure reducing moving iron core 224, a pressure reducing coil winding 225, and a pressure reducing static iron core 226 are connected in sequence; the bottom plate assembly 203 includes a bottom plate 231, a pressure maintaining film The bottom plate 231 is provided with a plurality of recessed grooves on the surface of the bottom plate 231 close to the shell back plate 206, the bottom plate 231 is attached to the shell back plate 206, and the grooves are connected to the shell back plate 206. A plurality of channels are formed between; the pressure maintaining diaphragm mechanism includes a pressure maintaining diaphragm 233 and a pressure maintaining diaphragm spring 234; the pressure reducing diaphragm mechanism includes a pressure reducing diaphragm 235 and a pressure reducing diaphragm spring 236; The pressure maintaining diaphragm 233 and the pressure reducing diaphragm 235 are both disposed between the bottom plate 231 and the intermediate valve body assembly 1; the cavity between the pressure maintaining diaphragm 233 and the bottom plate 231 forms the pressure maintaining diaphragm action cavity 520, The pressure-retaining diaphragm spring 234 is arranged between the pressure-retaining diaphragm 233 and the bottom plate 231; the cavity between the pressure-reducing diaphragm 235 and the bottom plate 231 forms a pressure-reducing diaphragm action chamber 528, and the pressure-reducing diaphragm spring 236 is arranged in the reducing Between the pressure diaphragm 235 and the bottom plate 231 ; the pressure maintaining diaphragm 233 is arranged between the intake ring groove 501 and the first air intake 502 to control the gap between the intake ring groove 501 and the first air intake 502 The pressure relief diaphragm 235 is arranged between the exhaust passage 505 and the gas outlet ring groove 504 to control the connection or disconnection of the exhaust passage 505 and the gas outlet ring groove 504; the pressure maintaining The passage includes a pressure-maintaining intake passage of the ABS solenoid valve and a pressure-maintaining exhaust passage of the ABS solenoid valve; the decompression passage includes a decompression intake passage of the ABS solenoid valve and a decompression and exhaust passage of the ABS solenoid valve; the The pressure-maintaining air intake passage of the ABS solenoid valve includes a pressure-maintaining air intake passage 511, a first pressure-maintaining air inlet 512, a second pressure-retaining air inlet 513, a third pressure-retaining air inlet 514, and a fourth The pressure maintaining air inlet 515, the fifth pressure maintaining air inlet 516, the sixth pressure maintaining air inlet 517, the seventh pressure maintaining air inlet 518 and the eighth pressure maintaining air inlet 519; the pressure maintaining air inlet channel 511 With outer intake ring groove 112 The first pressure maintaining air inlet 512 and the second pressure maintaining air inlet 513 are communicated through a channel, the seventh pressure maintaining air inlet 518 and the eighth pressure maintaining air inlet 519 are communicated through a channel, and the eighth pressure maintaining air inlet The air inlet 519 communicates with the pressure maintaining diaphragm action chamber 520; the decompression air intake passage of the ABS solenoid valve includes a first decompression air inlet 521, a second decompression air inlet 522, a third decompression air inlet 522, and a third decompression air inlet that are connected in sequence. pressure inlet 523, fourth reduced pressure inlet 524, fifth reduced pressure inlet 525, sixth reduced pressure inlet 526 and seventh reduced pressure inlet 527; the first reduced pressure inlet The port 521 is communicated with the first pressure-retaining air inlet 512 through a passage, the sixth decompression air inlet 526 and the seventh decompression air inlet 527 are communicated through a passage, and the seventh decompression air inlet 527 is connected with the decompression membrane. The plate action cavity 528 is connected; the pressure maintaining and exhausting passage of the ABS solenoid valve includes a first pressure maintaining exhaust port 531, a second pressure maintaining exhaust port 532 and a pressure maintaining and decompression common exhaust port 544 which are connected in sequence; The two pressure-maintaining exhaust ports 532 and the pressure-maintaining and decompression common exhaust port 544 are communicated through a channel; the decompression and exhaust passage of the ABS solenoid valve includes a first decompression exhaust port 541, a second decompression exhaust port 541, and a second decompression exhaust port 541, which are connected in sequence. The exhaust port 542, the third decompression exhaust port 543, and the pressure-maintaining and decompression common exhaust port 544; The pressure common exhaust port 544 communicates with the exhaust port 13 through the pressure maintaining and decompression common exhaust passage 545 inside the intermediate valve body assembly 1; the pressure maintaining valve 212 controls the fourth pressure maintaining air inlet 515 and the fifth pressure maintaining air inlet 515. The connection and disconnection of the pressure air inlet 516; the pressure-retaining moving iron core 214 controls the connection and disconnection of the fifth pressure-retaining air inlet 516 and the first pressure-retaining exhaust port 531; the pressure reducing valve 222 controls The first decompression exhaust port 541 is connected and disconnected from the fourth decompression air inlet 524; Connect and disconnect.

In the passage between the first pressure maintaining air inlet 512 and the second pressure maintaining air inlet 513, the passage between the seventh pressure maintaining air inlet 518 and the eighth pressure maintaining air inlet 519 and the middle and first pressure reducing In the passage between the pressure air inlet 521 and the first pressure maintaining air inlet 512, in the passage between the fifth decompression air inlet 525 and the sixth decompression air inlet 526, and in the third decompression exhaust port A sealing ring 232 for strengthening sealing is provided in the passage between 543 and the pressure maintaining and decompressing common exhaust port 544 .

The connector assembly 204 includes a connector grounding end 261, a pressure maintaining solenoid valve control end 262 that is connected to the pressure maintaining coil winding 215 in the pressure maintaining solenoid valve 201 and controls the pressure maintaining solenoid valve 201, and is connected to the pressure reducing solenoid valve. The decompression coil winding 225 in 202 is connected to and controls the decompression solenoid valve control end 263 of the decompression solenoid valve 202; the connector grounding end 261, the pressure maintaining solenoid valve control end 262 and the decompression solenoid valve control end 263 are all It protrudes from the inside of the casing 205 to the outside of the casing 205 .

The air inlet passage 113, the pressure maintaining air inlet passage 511, and the pressure maintaining and decompressing common exhaust passage 545 are arranged inside the intermediate valve body assembly 1; the third pressure maintaining air inlet 514 and the sixth pressure maintaining air inlet 517, the second decompression air inlet 522, the fifth decompression air inlet 525, the second pressure maintaining air outlet 532 and the second decompression air outlet 542 are arranged on the outer surface of the housing back plate 206; The fourth pressure maintaining air inlet 515, the fifth pressure maintaining air inlet 516, the third pressure reducing air inlet 523, the fourth pressure reducing air inlet 524, the first pressure maintaining exhaust port 531, the first pressure reducing The exhaust port 541 is arranged on the inner surface of the housing back plate 206; the first pressure maintaining air inlet 512, the second pressure maintaining air inlet 513, the seventh pressure maintaining air inlet 518, the eighth pressure maintaining inlet The air port 519, the first decompression air inlet 521, the sixth decompression air inlet 526, the seventh decompression air inlet 527, the third decompression exhaust port 543, and the pressure maintaining and decompression common exhaust port 544 are provided On the bottom plate 231; wherein, the fourth pressure maintaining air inlet 515 and the third pressure maintaining air inlet 514 are two ports of the same through hole on the shell back plate 206, and the fifth pressure maintaining air inlet 516 and the sixth pressure-retaining air inlet 517 are respectively two ports of the same through hole on the casing back plate 206, and the third decompression air inlet 523 and the second decompression air inlet 522 are respectively the casing back plate 206 The two ports of the same through hole, the fourth decompression air inlet 524 and the fifth decompression air inlet 525 are the two ports of the same through hole on the shell back plate 206, respectively, the first pressure maintaining and exhausting The port 531 and the second pressure-retaining exhaust port 532 are respectively two ports of the same through hole on the back plate 206 of the casing, and the first decompression exhaust port 541 and the second pressure-reducing exhaust port 542 are respectively the back of the casing. The two ports of the same through hole on the plate 206; after the housing back plate 206 and the bottom plate assembly 203 are attached and installed, the third pressure maintaining air inlet 514 and the second pressure maintaining air inlet 513 are opposite and communicate with each other, The sixth pressure-maintaining air inlet 517 and the seventh pressure-retaining air inlet 518 are opposite and communicate with each other, the second decompression air inlet 522 is opposite to the first decompression air inlet 521 and communicate with each other, and the fifth decompression air intake The port 525 is opposite to the sixth decompression air inlet 526 and communicates with each other, the second pressure maintaining exhaust port 532 is aligned with the passage between the third decompression exhaust port 543 and the pressure maintaining and decompression common exhaust port 544 and is connected with the second pressure maintaining exhaust port 532. The passage communicates, and the second decompression exhaust port 542 and the third decompression exhaust port 543 are opposite to each other and communicate with each other.

The pressure-maintaining valve 212 is provided with a pressure-maintaining valve groove along the axis direction that can communicate the fourth pressure-maintaining air inlet 515 and the fifth pressure-maintaining air inlet 516; the pressure-maintaining moving iron core 214 has a rectangular groove outside There is a hollow channel on the axis of the pressure maintaining static iron core 216; the hollow channel of the pressure maintaining static iron core 216 is always communicated with the first pressure maintaining exhaust port 531; When it is close to the pressure maintaining valve 212 side, the rear end face of the pressure maintaining moving iron core 214 blocks the opening of the pressure maintaining valve groove on the side close to the fifth pressure maintaining air inlet 516, the pressure maintaining valve 212 is closed, and the fourth pressure maintaining air intake The communication between the port 515 and the fifth pressure maintaining air inlet 516 is disconnected, the front end surface of the pressure maintaining movable iron core 214 is separated from the rear end surface of the pressure maintaining static iron core 216, and the hollow channel of the pressure maintaining static iron core 216 is connected to the pressure maintaining static iron core 216. The rectangular groove of the pressure-holding iron core 214 communicates with the first pressure-holding exhaust port 531 through the rectangular groove of the pressure-holding moving iron core 214 and the hollow passage of the pressure-holding static iron core 216 When the pressure maintaining moving iron core 214 moves to the side away from the pressure maintaining valve 212, the rear end face of the pressure maintaining moving iron core 214 leaves the opening of the pressure maintaining valve groove and is close to the opening on the side of the fifth pressure maintaining air inlet 516. The pressure valve 212 is opened, the fourth pressure maintaining air inlet 515 and the fifth pressure maintaining air inlet 516 are connected, and the rear end surface of the pressure maintaining movable iron core 214 is attached to the front end surface of the pressure maintaining static iron core 216 and blocks the pressure maintaining static iron The hollow channel of the core 216 is close to the opening on the side of the pressure-maintaining movable iron core 214, and the communication between the rectangular groove of the pressure-maintaining movable iron core 214 and the hollow channel of the pressure-maintaining static iron core 216 is disconnected, and the fifth pressure-holding inlet The communication between the air port 516 and the first pressure maintaining and exhaust port 531 is disconnected; the pressure reducing valve 222 is opened along the axis direction to connect the first pressure reducing exhaust port 541 and the fourth pressure reducing air inlet 524 The connected decompression valve grooves have a rectangular groove on the outside of the decompression moving iron core 224, and a hollow channel on the axis of the decompression static iron core 226. The hollow channel of the decompression static iron core 226 is always connected with the third decompression intake air. When the decompression moving iron core 224 moves to the side close to the decompression valve 222, the rear end face of the decompression moving iron core 224 blocks the groove of the decompression valve close to the fourth decompression air inlet 524 side. opening, the decompression valve 222 is closed, the communication between the first decompression exhaust port 541 and the fourth decompression air inlet 524 is disconnected, and the front end surface of the decompression movable iron core 224 is separated from the pressure reduction static iron core 226. At the rear end, the hollow channel of the decompression static iron core 226 communicates with the rectangular groove of the decompression movable iron core 224 , and the third decompression air inlet 523 passes through the hollow channel of the decompression static iron core 226 and the decompression movable iron core 224 The rectangular groove is communicated with the fourth decompression air inlet 524; when the decompression movable iron core 224 is located on the side that moves away from the decompression valve 222, the rear end face of the decompression movable iron core 224 leaves the decompression valve groove close to the The opening on one side of the fourth decompression air inlet 524, the decompression valve 222 is opened, the first decompression exhaust port 541 and the fourth decompression air inlet 524 communicate with each other, and the moving iron core 22 is decompressed. The front end surface of 4 is attached to the rear end surface of the decompression static iron core 226 and blocks the opening of the hollow passage of the decompression static iron core 226 near the side of the decompression movable iron core 224. The communication between the hollow passages of the static iron core 226 is disconnected, and the communication between the third decompression air inlet 523 and the fourth decompression air inlet 524 is disconnected.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model provides a dual-channel ABS rear axle brake module assembly for commercial vehicles, because the utility model adopts various air inlets, air outlets, exhaust ports, and the setting of the overall air intake, air outlet and exhaust air passages. , a relay valve and two ABS solenoid valves are highly integrated and optimized, so it can effectively reduce the number of parts, reduce the cost and weight of the vehicle, and improve assembly efficiency. Since the use of the utility model can reduce the pipeline connection of the braking system of the whole vehicle, the leakage risk point of the pipe joint can be effectively reduced, and the air tightness can be improved. Because the structure of the utility model allows a larger internal diameter of the ABS solenoid valve, the utility model can improve the response speed of the vehicle braking system.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

1 is a schematic structural diagram of the dual-channel ABS rear axle braking module assembly of the present invention;

Fig. 2 is the A-A sectional view of the embodiment shown in Fig. 1, which is a schematic diagram of the internal structure of the intermediate valve body of the dual-channel ABS rear axle brake module assembly of the utility model;

3 is a schematic structural diagram of the pressure-maintaining diaphragm mechanism and the decompression diaphragm mechanism of the dual-channel ABS rear axle brake module assembly of the present invention;

Fig. 4 is the B-B sectional view of the embodiment shown in Fig. 1, is the structural representation of the ABS solenoid valve on the left side of the dual-channel ABS rear axle brake module assembly of the utility model;

5 is a schematic diagram of the internal structure of the left ABS solenoid valve base plate assembly of the dual-channel ABS rear axle brake module assembly of the present invention;

6 is a schematic diagram of the external air hole structure of the left ABS solenoid valve assembly of the dual-channel ABS rear axle brake module assembly of the present invention;

7 is a schematic structural diagram of the control end of the ABS solenoid valve of the dual-channel ABS rear axle brake module assembly of the present invention;

8 is a schematic three-dimensional structural diagram of the dual-channel ABS rear axle braking module assembly of the present invention.

In the figure: 1 is the middle valve body assembly, 2 is the left ABS solenoid valve, 3 is the right ABS solenoid valve, 4 is the exhaust muffler; 11 is the air inlet, 111 is the inner inlet ring groove, and 112 is the outer inlet Air ring groove, 113 is the air inlet channel, 121 is the left air outlet, 122 is the right air outlet, 13 is the exhaust port; 14 is the control air port, 141 is the control chamber; 15 is the valve cover, 151 is the guide rod, 152 is the piston assembly; 16 is the valve body, 161 is the valve seat, 162 is the valve, 163 is the valve return spring, 164 is the spring seat; 201 is the pressure maintaining solenoid valve, 202 is the pressure reducing solenoid valve, and 203 is the base plate assembly, 204 is the connector assembly, 205 is the housing, 206 is the back plate of the housing, 211 is the cover, 212 is the pressure-maintaining valve, 213 is the pressure-maintaining moving iron core spring, 214 is the pressure-retaining moving iron core, and 215 is the pressure-retaining moving iron core. Pressure coil winding, 216 is the pressure-retaining static iron core, 221 is the plug cover, 222 is the pressure reducing valve, 223 is the pressure-reducing moving iron core spring, 224 is the pressure-reducing moving iron core, 225 is the pressure-reducing coil winding, and 226 is the reducing Pressed iron core. 231 is the bottom plate, 232 is the special-shaped sealing ring, 233 is the pressure-retaining diaphragm, 234 is the pressure-retaining diaphragm spring, 235 is the pressure-reducing diaphragm, 236 is the pressure-reducing diaphragm spring, 261 is the grounding end of the connector, and 262 is the pressure-reducing diaphragm spring. The control end of the pressure maintaining solenoid valve, 263 is the control end of the decompression solenoid valve; 501 is the intake ring groove, 502 is the first intake port, 503 is the second intake port, 504 is the air outlet ring groove, and 505 is the exhaust channel , 506 is the air outlet channel; 511 is the pressure maintaining passage, 512 is the first pressure maintaining air inlet, 513 is the second pressure maintaining air inlet, 514 is the third pressure maintaining air inlet, and 515 is the fourth pressure maintaining air intake 516 is the fifth pressure maintaining air inlet, 517 is the sixth pressure maintaining air inlet, 518 is the seventh pressure maintaining air inlet, 519 is the eighth pressure maintaining air inlet, and 520 is the pressure maintaining diaphragm action chamber 521 is the first decompression inlet, 522 is the second decompression inlet, 523 is the third decompression inlet, 524 is the fourth decompression inlet, and 525 is the fifth decompression inlet 526 is the sixth decompression air inlet, 527 is the seventh decompression air inlet, 528 is the decompression diaphragm action chamber; 531 is the first pressure maintaining exhaust port, 532 is the second pressure maintaining exhaust port 541 is the first decompression exhaust port, 542 is the second decompression exhaust port, 543 is the third decompression exhaust port, 544 is the pressure maintaining and decompressing public exhaust port, and 545 is the pressure maintaining and decompression common exhaust port air channel.

Detailed ways

The utility model provides a dual-channel ABS rear axle braking module assembly for commercial vehicles, as shown in Figure 1, Figure 2, Figure 3 and Figure 8, comprising an intermediate valve body assembly 1 and two ABS solenoid valves with the same structure , the two ABS solenoid valves are the left ABS solenoid valve 2 arranged on the left side of the middle valve body assembly 1 and the right ABS solenoid valve 3 arranged on the right side of the middle valve body assembly 1. Air muffler 4, an air inlet 11 is provided in the middle of the intermediate valve body assembly 1, and an upper part of the intermediate valve body assembly 1 is provided with a connection or disconnection between the air inlet 11 and the left ABS solenoid valve 2 and the right ABS solenoid valve 3. Control air port 14, the left side of the middle valve body assembly 1 is provided with a left side air outlet 121 that communicates with the left ABS solenoid valve 2, and the right side of the middle valve body assembly 1 is provided with a right side communicated with the right ABS solenoid valve 3. The air outlet 122, the lower part of the intermediate valve body assembly 1 is provided with an air outlet 13 that communicates with the exhaust muffler 4;

The intermediate valve body assembly 1 is composed of a valve cover 15 and a valve body 16; the valve cover 15 is provided with a valve control mechanism; the valve body 16 is provided with an inner air inlet ring groove 111 and an outer air inlet ring groove 112, and the inner air intake The ring groove 111 is communicated with the air inlet 11, and the outer air inlet ring groove 112 is respectively communicated with the left ABS solenoid valve 2 and the right ABS solenoid valve 3; the valve body 16 is provided with a valve for controlling the outer air inlet ring groove 112 and the The valve mechanism connected to the inner inlet ring groove 111 or the exhaust port 13, the movement of the valve mechanism is controlled by the valve control mechanism;

The valve body 16 is provided with two inlet ring grooves 501 , two groups of inlet passages, two outlet ring grooves 504 , and two exhaust passages 505 . The outer air inlet ring groove 112 is communicated with, and the two exhaust passages 505 are both communicated with the exhaust port 13. Between the two air inlet ring grooves 501 and each group of air inlet passages, there is a space between the two air inlet ring grooves 501 and each group of air inlet passages for controlling the connection between the air inlet ring grooves 501 and the air inlet passages. The connected or disconnected pressure-maintaining diaphragm mechanism of the group of air inlet passages; the two groups of air inlet passages are respectively connected with an air outlet ring groove 504, each air outlet ring groove 504 is communicated with an exhaust passage 505, and each air outlet The ring grooves 504 are respectively communicated with the left air outlet 121 and the right air outlet 122; between each exhaust passage 505 and the corresponding air outlet ring groove 504, there is a space for controlling the exhaust passage 505 and the corresponding air outlet ring. The connected or disconnected decompression diaphragm mechanism of the groove 504; between the outer inlet ring groove 112 and the pressure maintaining diaphragm mechanism, there is a pressure maintaining passage for controlling the pressure maintaining diaphragm mechanism, and the pressure maintaining in the ABS solenoid valve The solenoid valve 201 is arranged on the pressure maintaining passage for controlling the connection or disconnection of the pressure maintaining passage, and a decompression passage for controlling the pressure reducing diaphragm mechanism is provided between the outer air inlet ring groove 112 and the pressure reducing diaphragm mechanism, The decompression solenoid valve 202 in the ABS solenoid valve is arranged on the decompression passage to control the connection or disconnection of the decompression passage, wherein the pressure maintaining solenoid valve 201 is normally open, the decompression solenoid valve 202 is normally closed, and the control air port 14 It is connected to the air outlet of the external brake valve, the air inlet 11 is connected to the external air reservoir, the left air outlet 121 is connected to the external left brake air chamber, and the right air outlet 122 is connected to the external right brake air chamber. connect.

The valve control mechanism is composed of a guide rod 151 on the valve cover 15, a piston assembly 152 and a control cavity 141, wherein the control cavity 141 is communicated with the control air port 14, and the piston assembly 152 can move up and down along the guide rod 151; the valve mechanism consists of the valve seat 161, The valve 162, the valve return spring 163 and the spring seat 164 are composed. The valve 162 is closely attached to the valve seat 161 under the action of the valve return spring 163.

Each group of air intake passages in the intermediate valve body assembly 1 is formed by connecting a first air inlet passage 502 and a second air inlet passage 503, the air inlet ring groove 501 is in communication with the first air inlet passage 502, and the second air intake passage is connected with each other. The channel 503 communicates with the air outlet ring groove 504;

As shown in FIG. 4 , the ABS solenoid valve includes a pressure maintaining solenoid valve 201 , a pressure reducing solenoid valve 202 , a base plate assembly 203 , and a device that is connected to an external vehicle ABS controller and controls the pressure maintaining solenoid valve 201 and the pressure reducing solenoid valve connection 202 The connector assembly 204 and the casing 205; the part of the casing 205 close to the middle valve body is the casing back plate 206, and the connector assembly 204, the pressure maintaining solenoid valve 201 and the pressure reducing solenoid valve 202 are jointly enclosed in the casing 205 inside; the shell back plate 206 and the bottom plate assembly 203 are bolted to the intermediate valve body assembly 1, and the bottom plate assembly 203 is located between the shell back plate 206 and the intermediate valve body assembly 1;

The pressure maintaining solenoid valve 201 is composed of a pressure maintaining solenoid valve blocking cover 211, a pressure maintaining valve 212, a pressure maintaining moving iron core spring 213, a pressure maintaining moving iron core 214, a pressure maintaining coil winding 215 and a pressure maintaining static iron core 216 connected in sequence, The decompression solenoid valve 202 is composed of a decompression solenoid valve plug 221, a decompression valve 222, a decompression moving iron core spring 223, a decompression moving iron core 224, a decompression coil winding 225, and a decompression static iron core 226 connected in sequence;

As shown in FIG. 5 , the base plate assembly 203 includes a base plate 231 , a pressure-maintaining diaphragm mechanism and a decompression diaphragm mechanism. A plurality of recessed special-shaped grooves are provided on the surface of the housing back plate 206 adjacent to the base plate 231 . The case back plate 206 is attached, and a plurality of special-shaped channels are formed between the special-shaped groove and the case back plate 206;

As shown in FIG. 3 , the pressure-retaining diaphragm mechanism includes a pressure-retaining diaphragm 233 and a pressure-retaining diaphragm spring 234. The pressure-reducing diaphragm mechanism includes a pressure-reducing diaphragm 235 and a pressure-reducing diaphragm spring 236. The pressure-retaining diaphragm 233 and The decompression diaphragms 235 are all arranged between the bottom plate 231 and the intermediate valve body assembly 1;

The cavity between the pressure maintaining diaphragm 233 and the bottom plate 231 forms the pressure maintaining diaphragm action chamber 520 , and the pressure maintaining diaphragm spring 234 is arranged between the pressure maintaining diaphragm 233 and the bottom plate 231 ; The cavity between the two forms the decompression diaphragm action chamber 528, the decompression diaphragm spring 236 is arranged between the decompression diaphragm 235 and the bottom plate 231; 502 is used to control the connection or disconnection between the inlet ring groove 501 and the first inlet passage 502; the decompression diaphragm 235 is arranged between the exhaust passage 505 and the outlet ring groove 504 to control the exhaust gas The communication or disconnection of the channel 505 and the outlet ring groove 504;

The pressure maintaining passage includes the pressure maintaining intake passage of the ABS solenoid valve and the pressure maintaining exhaust passage of the ABS solenoid valve; the decompression passage includes the decompression intake passage of the ABS solenoid valve and the decompression exhaust passage of the ABS solenoid valve;

As shown in FIGS. 2 to 6 , the pressure-maintaining air intake passage of the ABS solenoid valve includes a pressure-maintaining air intake passage 511 , a first pressure-retaining air inlet 512 , a second pressure-retaining air inlet 513 , and a third air-holding air inlet 513 , which are connected in sequence. Pressure air inlet 514 , fourth pressure retention air inlet 515 , fifth pressure retention air inlet 516 , sixth pressure retention air inlet 517 , seventh pressure retention air inlet 518 and eighth pressure retention air inlet 519 ; The pressure-maintaining air inlet channel 511 is communicated with the outer air inlet ring groove 112, the first pressure-retaining air inlet 512 and the second pressure-retaining air inlet 513 are communicated through a special-shaped channel, the seventh pressure-retaining air inlet 518 and the eighth The pressure maintaining air inlet 519 is communicated through a special-shaped channel, and the eighth pressure maintaining air inlet 519 is communicated with the pressure maintaining diaphragm action chamber 520;

The decompression intake passage of the ABS solenoid valve includes a first decompression intake port 521, a second decompression intake port 522, a third decompression intake port 523, a fourth decompression intake port 524, a The fifth decompression air inlet 525, the sixth decompression air inlet 526 and the seventh decompression air inlet 527; the first decompression air inlet 521 and the first pressure maintaining air inlet 512 are communicated through a special-shaped channel, and the first decompression air inlet 521 and the first pressure maintaining air inlet 512 The sixth decompression air inlet 526 and the seventh decompression air inlet 527 are communicated through a special-shaped channel, and the seventh decompression air inlet 527 is communicated with the decompression diaphragm action chamber 528;

The pressure maintaining and exhausting passage of the ABS solenoid valve includes a first pressure maintaining exhaust port 531, a second pressure maintaining exhaust port 532 and a pressure maintaining and decompressing common exhaust port 544 that are communicated in sequence; the second pressure maintaining exhaust port 532 and The pressure maintaining and decompression common exhaust port 544 is communicated through a special-shaped channel;

The decompression and exhaust passage of the ABS solenoid valve includes a first decompression exhaust port 541, a second decompression exhaust port 542, a third decompression exhaust port 543 and a pressure-maintaining and decompression common exhaust port 544 that are communicated in sequence; The third decompression exhaust port 543 and the pressure maintaining and decompression common exhaust port 544 are communicated through a special-shaped channel, and the pressure maintaining and decompression common exhaust port 544 and the exhaust port 13 pass through the internal pressure maintaining and decompression of the intermediate valve body assembly 1. Press the common exhaust channel 545 to communicate;

The pressure maintaining valve 212 controls the connection and disconnection of the fourth pressure maintaining air inlet 515 and the fifth pressure maintaining air inlet 516, and the pressure maintaining moving iron core 214 controls the fifth pressure maintaining air inlet 516 and the first pressure maintaining exhaust Connection and disconnection of port 531;

The decompression valve 222 controls the connection and disconnection between the first decompression exhaust port 541 and the fourth decompression air inlet 524, and the decompression moving iron core 224 controls the fourth decompression air inlet 524 and the third decompression air intake Connection and disconnection of port 523.

In the special-shaped channel between the first pressure maintaining air inlet 512 and the second pressure maintaining air inlet 513, the special-shaped channel between the seventh pressure maintaining air inlet 518 and the eighth pressure maintaining air inlet 519 and the middle and second pressure maintaining air inlets In the special-shaped passage between the first decompression air inlet 521 and the first pressure maintaining air inlet 512, in the special-shaped passage between the fifth decompression air inlet 525 and the sixth decompression air inlet 526, and in the third decompression air inlet A special-shaped sealing ring 232 for strengthening sealing is provided in the special-shaped passage between the pressure exhaust port 543 and the pressure maintaining and decompression common exhaust port 544 .

As shown in FIG. 7 , the connector assembly 204 includes a connector grounding end 261 , a pressure maintaining solenoid valve control end 262 connected to the pressure maintaining coil winding 215 in the pressure maintaining solenoid valve 201 and controlling the pressure maintaining solenoid valve 201 , and a pressure maintaining solenoid valve control end 262 connected to the pressure maintaining solenoid valve 201 . The decompression coil winding 225 in the decompression solenoid valve 202 is connected to and controls the decompression solenoid valve control end 263 of the decompression solenoid valve 202, the connector grounding end 261, the pressure maintaining solenoid valve control end 262 and the decompression solenoid valve control end 263 all protrude from the inside of the casing 205 to the outside of the casing 205 .

As shown in FIG. 2 and FIG. 3 , the intake passage 113 , the pressure maintaining intake passage 511 , and the pressure maintaining and decompressing common exhaust passage 545 are arranged inside the intermediate valve body assembly 1 ;

As shown in FIG. 4 to FIG. 5 , the third pressure maintaining air inlet 514 , the sixth pressure maintaining air inlet 517 , the second pressure reducing air inlet 522 , the fifth pressure reducing air inlet 525 , and the second pressure maintaining exhaust The air port 532 and the second decompression exhaust port 542 are provided on the outer surface of the housing back plate 206;

The fourth pressure maintaining air inlet 515, the fifth pressure maintaining air inlet 516, the third pressure reducing air inlet 523, the fourth pressure reducing air inlet 524, the first pressure maintaining exhaust port 531, the first pressure reducing exhaust port The air port 541 is arranged on the inner surface of the housing back plate 206;

The first pressure maintaining air inlet 512, the second pressure maintaining air inlet 513, the seventh pressure maintaining air inlet 518, the eighth pressure maintaining air inlet 519, the first pressure reducing air inlet 521, the sixth pressure reducing air inlet The air port 526, the seventh decompression air inlet 527, the third decompression exhaust port 543, and the pressure maintaining and decompression common exhaust port 544 are arranged on the bottom plate 231;

The fourth pressure maintaining air inlet 515 and the third pressure maintaining air inlet 514 are respectively two ports of the same through hole on the housing back plate 206 , and the fifth pressure maintaining air inlet 516 and the sixth pressure maintaining air intake The ports 517 are respectively two ports of the same through hole on the housing back plate 206 , and the third decompression air inlet 523 and the second decompression air inlet 522 are respectively two ports of the same through hole in the casing back plate 206 . The fourth decompression air inlet 524 and the fifth decompression air inlet 525 are two ports of the same through hole on the back plate 206 of the housing, the first pressure maintaining exhaust port 531 and the second pressure maintaining exhaust port 531 The air ports 532 are respectively two ports of the same through hole on the housing backplane 206 , and the first decompression exhaust port 541 and the second decompression exhaust port 542 are respectively the same through hole on the case backplane 206 . two mouths;

After the housing back plate 206 and the bottom plate assembly 203 are attached and installed, the third pressure maintaining air inlet 514 and the second pressure maintaining air inlet 513 are opposite and communicate with each other, and the sixth pressure maintaining air inlet 517 and the seventh pressure maintaining air inlet 517 are connected to each other. The air ports 518 are opposite and communicate with each other, the second decompression air inlet 522 and the first decompression air inlet 521 are opposite and communicate with each other, the fifth decompression air inlet 525 and the sixth decompression air inlet 526 are opposite and mutually The second pressure maintaining exhaust port 532 is aligned with the special-shaped channel between the third pressure-reducing exhaust port 543 and the pressure-maintaining and decompressing common exhaust port 544 and communicates with the special-shaped channel, and the second pressure-reducing exhaust port 542 Opposite to the third decompression exhaust port 543 and communicate with each other.

As shown in FIG. 4 , the pressure-maintaining valve 212 is provided with a pressure-maintaining valve groove along the axis direction, which can connect the fourth pressure-maintaining air inlet 515 and the fifth pressure-maintaining air inlet 516 , and the pressure-maintaining moving iron core 214 has a groove on the outside thereof. A rectangular groove, there is a hollow channel on the axis of the pressure-holding static iron core 216, and the hollow channel of the pressure-holding static iron core 216 is always communicated with the first pressure-holding exhaust port 531; When one side of the pressure maintaining valve 212 is pressed, the rear end face of the pressure maintaining moving iron core 214 blocks the opening of the pressure maintaining valve groove close to the side of the fifth pressure maintaining air inlet 516 , the pressure maintaining valve 212 is closed, and the fourth pressure maintaining air inlet 515 is closed. The communication with the fifth pressure maintaining air inlet 516 is disconnected, the front end surface of the pressure maintaining movable iron core 214 is separated from the rear end surface of the pressure maintaining static iron core 216, and the hollow passage of the pressure maintaining static iron core 216 is connected to the pressure maintaining dynamic iron core 216. The rectangular groove of the iron core 214 is communicated, and the fifth pressure maintaining air inlet 516 is communicated with the first pressure maintaining exhaust port 531 through the rectangular groove of the pressure maintaining moving iron core 214 and the hollow passage of the pressure maintaining static iron core 216; When the pressure maintaining movable iron core 214 moves to the side away from the pressure maintaining valve 212, the rear end surface of the pressure maintaining movable iron core 214 leaves the groove of the pressure maintaining valve and is close to the opening on the side of the fifth pressure maintaining air inlet 516, and the pressure maintaining valve 212 is opened, the fourth pressure maintaining air inlet 515 and the fifth pressure maintaining air inlet 516 are connected, the rear end surface of the pressure maintaining moving iron core 214 is attached to the front end surface of the pressure maintaining static iron core 216 and blocks the pressure maintaining static iron core 216 The hollow channel is close to the opening on the side of the pressure maintaining moving iron core 214, the communication between the rectangular groove of the pressure maintaining moving iron core 214 and the hollow channel of the pressure maintaining static iron core 216 is disconnected, and the fifth pressure maintaining air inlet The communication between 516 and the first pressure-holding exhaust port 531 is disconnected;

As shown in FIG. 4 , the decompression valve 222 is provided with a decompression valve groove along the axial direction that can communicate the first decompression exhaust port 541 with the fourth decompression air inlet 524 , and the outer side of the decompression moving iron core 224 has a groove. A rectangular groove, there is a hollow channel on the axis of the decompression static iron core 226, and the hollow channel of the decompression static iron core 226 is always communicated with the third decompression air inlet 523; When pressing the valve 222 side, the rear end face of the pressure reducing moving iron core 224 blocks the opening of the pressure reducing valve groove close to the fourth pressure reducing air inlet 524, the pressure reducing valve 222 is closed, and the first pressure reducing exhaust port 541 The communication with the fourth decompression air inlet 524 is disconnected, the front end surface of the decompression movable iron core 224 is separated from the rear end surface of the decompression static iron core 226, and the hollow passage of the decompression static iron core 226 is connected to the decompression movable iron core 226. The rectangular groove of the iron core 224 is communicated, and the third decompression air inlet 523 is communicated with the fourth decompression air inlet 524 through the hollow passage of the decompression static iron core 226 and the rectangular groove of the decompression movable iron core 224; when When the decompression movable iron core 224 is moved to the side away from the decompression valve 222, the rear end surface of the decompression movable iron core 224 leaves the groove of the decompression valve and is close to the opening on the side of the fourth decompression air inlet 524. 222 is opened, the first decompression exhaust port 541 and the fourth decompression air inlet 524 communicate with each other, and the front end surface of the decompression moving iron core 224 is attached to the rear end surface of the decompression static iron core 226 and blocks the decompression static iron The hollow channel of the core 226 is close to the opening on the side of the decompression movable iron core 224, the communication between the rectangular groove of the decompression movable iron core 224 and the hollow channel of the decompression static iron core 226 is disconnected, and the third decompression inlet is disconnected. The communication between the air port 523 and the fourth decompression air intake port 524 is disconnected.

In this embodiment, as shown in FIG. 4 , the pressure maintaining solenoid valve 201 is normally open, and the pressure reducing solenoid valve 202 is normally closed. When the control end 262 of the pressure maintaining solenoid valve is energized, the pressure maintaining coil winding 215 is energized and generates an electromagnetic field together with the pressure maintaining static iron core 216, so that the pressure maintaining moving iron core 214 moves to the pressure maintaining static iron core 216 to realize the pressure maintaining solenoid valve 201 is closed, the pressure maintaining valve 212 is opened, and the communication between the fifth pressure maintaining air inlet 516 and the first pressure maintaining exhaust port 531 is disconnected at the same time. When the control end 263 of the decompression solenoid valve is energized, the decompression coil winding 225 is energized and generates an electromagnetic field together with the decompression static iron core 226, so that the decompression moving iron core 224 moves to the decompression static iron core 226 to realize the decompression solenoid valve. 202 is disconnected, the communication between the third decompression air inlet 523 and the fourth decompression air inlet 524 is disconnected, and the decompression valve 222 is opened at the same time. The on-off of the pressure maintaining solenoid valve control end 262 and the pressure reducing solenoid valve control end 263 is controlled by the vehicle ABS controller.

In the above-mentioned embodiment, its working principle is as follows:

In actual use, the control air port 14 of this embodiment is connected to the external brake valve air outlet, the air inlet is connected to the external air storage cylinder, and the left air outlet 121 is connected to the external left brake air chamber air inlet. The right air outlet 122 is connected to the external right brake air chamber air intake, and the connector assembly 204 is connected to the external ABS controller of the vehicle.

In the normal braking stage, neither the pressure maintaining solenoid valve control terminal 262 nor the pressure reducing solenoid valve control terminal 263 is energized, that is, neither the pressure maintaining coil winding 215 nor the pressure reducing coil winding 225 is energized. The pressure maintaining moving iron core 214 is pressed against the pressure maintaining valve 212 under the action of the pressure maintaining moving iron core spring 213, and the pressure maintaining valve 212 is closed. At this time, the fourth pressure maintaining air inlet 515 and the fifth pressure maintaining air inlet are The communication between 516 is cut off, and the fifth pressure maintaining air inlet 516 communicates with the first pressure maintaining exhaust port 531 . The decompression movable iron core 224 is pressed against the decompression valve 222 under the action of the decompression movable iron core 223, and the decompression valve 222 is closed. At this time, the first decompression exhaust port 541 and the fourth decompression air inlet 524 The communication therebetween is disconnected, and the communication between the third decompression intake port 523 and the fourth decompression intake port 524 is disconnected.

When the driver steps on the brake pedal, high-pressure air enters the control chamber 141 from the air outlet of the brake valve through the control air port 14 of the present invention, so that the piston assembly 152 moves down along the guide rod 151, and the lower part of the piston assembly 152 is connected to the valve 162 contact and stick together, so that the communication between the outer inlet ring groove 112 and the exhaust port 13 is disconnected, the piston assembly 152 continues to move downward, and the valve 162 is pushed open, so that the outer inlet ring groove 112 is connected to the exhaust port. 13 is disconnected and communicated with the inner inlet ring groove 111 . The high-pressure air at the air inlet 11 enters the outer air inlet ring groove 112 through the inner air inlet ring groove 111, and then is divided into two air flows, one of which enters the air inlet ring groove 501 through the air inlet passage 113, and the other enters the pressure maintaining passage. 511. The pressure maintaining passage 511 communicates with the first pressure maintaining air inlet 512 . At this time, the high-pressure gas in the first pressure-maintaining air inlet 512 is divided into two airflows, one of which flows in the first pressure-retaining air inlet 512 - the second pressure-retaining air inlet 513 - the third pressure-retaining air intake Port 514 - the fourth pressure maintaining air inlet 515 , under the action of the pressure maintaining moving iron core spring 213 and the pressure maintaining moving iron core 214 , the high pressure gas stays at the valve port of the pressure maintaining valve 212 . The other flow direction is the first pressure maintaining air inlet 512 - the first decompression air inlet 521 - the second decompression air inlet 522 - the third decompression air inlet 523 - the fourth decompression air intake Port 524——the fifth decompression air inlet 525——the sixth decompression air inlet 526——the decompression diaphragm action chamber 527, the high pressure gas in the decompression diaphragm action chamber 527 and the decompression diaphragm spring 236 together The action resists the decompression diaphragm 235 and closes the exhaust passage 505 . At the same time, the high-pressure gas in the inlet ring groove 501 pushes open the pressure maintaining diaphragm 233, enters the first inlet passage 502, passes through the second inlet passage 503 and the outlet ring groove 504, reaches the left air outlet 121, and finally reaches Brake air chamber for vehicle braking.

When a certain pressure is reached in the outer inlet ring groove 112, the piston assembly 152 reaches a balanced state under the combined action of the lower air pressure and the air pressure in the control chamber 141, and the valve 162 moves upward and presses on the valve seat 161. At this time, the outer air inlet ring The communication between the groove 112 and the inner air inlet ring groove 111 is disconnected, and the air pressure in the outer air inlet ring groove 112 and the brake air chamber no longer increases, and also reaches an equilibrium state.

Holding stage:

In the conventional braking stage, when the vehicle ABS controller judges according to the detected vehicle state and the preset control strategy, when the brake air chamber needs to enter the pressure-holding state, the pressure-holding solenoid valve control terminal 262 will be activated. When energized, the control end 263 of the decompression solenoid valve is not energized, that is, the voltage maintaining coil winding 215 is energized, and the decompression coil winding 225 is not energized. The pressure-maintaining moving iron core 214 moves to the pressure-maintaining static iron core 216, and the pressure-maintaining valve 212 is opened. At this time, the fourth pressure-maintaining air inlet 515 is communicated with the fifth pressure-retaining air inlet 516, and the fifth pressure-retaining air inlet 516 Communication with the first pressure-maintaining exhaust port 531 is disconnected. The decompression movable iron core 224 is pressed against the decompression valve 222 under the action of the decompression movable iron core 223, and the decompression valve 222 is closed. At this time, the first decompression exhaust port 541 and the fourth decompression air inlet 524 The communication therebetween is disconnected, and the third decompression intake port 523 communicates with the fourth decompression intake port 524 .

At this time, the high-pressure gas at the fourth pressure maintaining inlet 515 enters the fifth pressure maintaining inlet 516 through the valve port of the pressure maintaining valve 212, and the gas flows in the fourth pressure maintaining inlet 515—the fifth pressure maintaining inlet Air port 516 - sixth pressure maintaining air inlet 517 - seventh pressure maintaining air inlet 518 - eighth pressure maintaining air inlet 519 - pressure maintaining diaphragm action chamber 520. The high pressure gas at the pressure maintaining diaphragm action chamber 520 and the pressure maintaining diaphragm spring 234 act together to hold the pressure maintaining diaphragm 233 to close the first air inlet 502 . The air flow between the air inlet ring groove 501 and the first air inlet passage 502 is cut off, and the air flow passage from the air inlet 11 to the air outlet 121 is cut off. At this time, the air pressure of the brake air chamber will not increase any more, and it is in a pressure-holding state.

Decompression phase:

In the pressure maintaining stage, when the vehicle ABS controller judges that the brake air chamber needs to be decompressed according to the detected vehicle state and the preset control strategy, it will make the pressure maintaining solenoid valve control end 262 and decompression Both the solenoid valve control end 263 is energized, that is, both the pressure maintaining coil winding 215 and the decompression coil winding 225 are energized. The pressure-maintaining moving iron core 214 moves to the pressure-maintaining static iron core 216, and the pressure-maintaining valve 212 is opened. At this time, the fourth pressure-maintaining air inlet 515 is communicated with the fifth pressure-retaining air inlet 516, and the fifth pressure-retaining air inlet 516 Communication with the first pressure-maintaining exhaust port 531 is disconnected. The decompression moving iron core 224 moves to the decompression static iron core 226, and the decompression valve 222 is opened. At this time, the first decompression exhaust port 541 communicates with the fourth decompression air inlet 524, and the third decompression air inlet 523 Communication with the fourth decompression intake port 524 is disconnected.

At this time, the flow direction of the high-pressure gas at the decompression diaphragm action chamber 527 is as follows: the decompression diaphragm action chamber 528 - the seventh decompression air inlet 527 - the sixth decompression air inlet 526 - the fifth decompression inlet Air port 525 - fourth decompression air inlet 524 - first decompression exhaust port 541 - second decompression exhaust port 542 - third decompression exhaust port 543 - pressure maintaining and decompression common Exhaust port 544 . The pressure maintaining and decompression common exhaust port 544 communicates with the exhaust port 13 through the internal passage of the intermediate valve body assembly 1. At this time, the high-pressure gas in the decompression diaphragm action chamber 527 is finally discharged into the atmosphere through the exhaust port 13 and the muffler 4. The high-pressure gas at the air outlet ring groove 504 pushes open the decompression diaphragm 235, so that the air outlet ring groove 504 communicates with the exhaust passage 505. At this time, the high-pressure gas in the brake air chamber passes through the left air outlet 121, the air outlet passage 506, and the air outlet. The ring groove 504 and the exhaust passage 505 are finally discharged into the atmosphere through the exhaust port 13 and the muffler 4 to achieve the purpose of decompressing the brake air chamber.

Boost stage:

In the decompression stage, when the vehicle ABS controller judges, according to the detected vehicle state and the preset control strategy, that the brake air chamber needs to enter the pressurized state, it will make the pressure maintaining solenoid valve control end 262 and the The control terminal 263 of the decompression solenoid valve is not energized, and the state of the solenoid valve at this time is the same as that in the normal braking stage.

Since the communication between the first decompression exhaust port 541 and the fourth decompression air inlet 524 is disconnected, the third decompression air inlet 523 is communicated with the fourth decompression air inlet 524, and the pressure-holding inlet is at this time. The high-pressure gas at the air passage 511 passes through the first pressure maintaining air inlet 512 - the first decompression air inlet 521 - the second decompression air inlet 522 - the third decompression air inlet 523 - the fourth Decompression air inlet 524 - fifth decompression air inlet 525 - sixth decompression air inlet 526 - seventh decompression air inlet 527 - decompression diaphragm action chamber 528, decompression diaphragm The high-pressure gas in the action chamber 528 and the decompression diaphragm spring 236 act together against the decompression diaphragm 235 to close the exhaust passage 505 .

Since the communication between the fourth pressure maintaining air inlet 515 and the fifth pressure maintaining air inlet 516 is cut off, the fifth pressure maintaining air inlet 516 is communicated with the first pressure maintaining exhaust port 531, and the pressure maintaining diaphragm is at this time. The flow direction of the high-pressure gas at the action chamber 520 is, at this time, the pressure-maintaining diaphragm action chamber 520—the eighth pressure-retaining air inlet 519—the seventh pressure-retaining air inlet 518—the sixth pressure-retaining air inlet 517— - the fifth pressure maintaining air inlet 516 - the first pressure maintaining exhaust port 531 - the second pressure maintaining exhaust port 532 - the pressure maintaining and decompression common exhaust port 544. The pressure maintaining and decompression common exhaust port 544 communicates with the exhaust port 13 through the internal passage of the intermediate valve body assembly 1 . At this time, the high pressure gas in the pressure maintaining diaphragm action chamber 520 is finally discharged into the atmosphere through the exhaust port 13 and the muffler 4 . At this time, the gas circulation state inside the left ABS solenoid valve 2 is the same as the above-mentioned conventional braking stage, so as to achieve the purpose of pressurizing the brake air chamber.

Regular release phase:

Following any of the above stages, the state of the solenoid valve is the same as that of the conventional braking stage and the boosting stage.

When the driver lifts the brake pedal, the high-pressure air in the control chamber 141 is discharged from the brake valve through the control air port 14, the piston assembly 152 moves upward under the action of the high-pressure air on its lower side, and the valve 162 is under the action of the valve return spring 163. Under the action of the valve seat 161, the connection between the inner inlet ring groove 111 and the outer inlet ring groove 112 is disconnected, and the lower part of the piston assembly 152 is separated from the valve 162, so that the outer inlet ring groove 112 It communicates with the exhaust port 3 . The high-pressure gas in the brake air chamber enters the exhaust port 3 through the outer intake ring groove, and is discharged into the atmosphere through the muffler 4. At this point, the entire braking process ends.

The dual-channel ABS rear axle braking module assembly of the utility model can realize the functions of one relay valve and two traditional ABS solenoid valves. Compared with the traditional relay valve and the ABS solenoid valve, the utility model has the advantages of high integration, fewer parts and components, low weight cost, convenient assembly, and low leakage risk.

Claims (8)

1. A dual-channel ABS rear axle brake module assembly for commercial vehicles, characterized in that it comprises an intermediate valve body assembly (1) and two ABS solenoid valves with the same structure, and the two ABS solenoid valves with the same structure are arranged at The left ABS solenoid valve (2) on the left side of the intermediate valve body assembly (1) and the right ABS solenoid valve (3) arranged on the right side of the intermediate valve body assembly (1); An exhaust muffler (4) is installed below, an air inlet (11) is arranged in the middle of the intermediate valve body assembly (1), and an air inlet (11) for controlling the left ABS and the upper part of the intermediate valve body assembly (1) is arranged The solenoid valve (2) and the right ABS solenoid valve (3) are connected or disconnected to the control air port (14), and the left side of the middle valve body assembly (1) is provided with a left side that communicates with the left ABS solenoid valve (2) The air outlet (121), the right side of the intermediate valve body assembly (1) is provided with a right air outlet (122) that communicates with the right ABS solenoid valve (3), and the lower part of the intermediate valve body assembly (1) is provided with a discharge port (122). an exhaust port (13) communicated with the gas muffler (4); the intermediate valve body assembly (1) is composed of a valve cover (15) and a valve body (16); a valve control mechanism is provided on the valve cover (15) ; The valve body (16) is provided with an inner air inlet ring groove (111) and an outer air inlet ring groove (112); the inner air inlet ring groove (111) is communicated with the air inlet (11); The outer air inlet ring groove (112) is respectively communicated with the left ABS solenoid valve (2) and the right ABS solenoid valve (3); the valve body (16) is internally provided with an outer air inlet ring groove for controlling the outer air inlet ring groove (112) A valve mechanism communicated with the inner inlet ring groove (111) or the exhaust port (13), the movement of the valve mechanism is controlled by the valve control mechanism; the valve body (16) is provided with two inlet ring grooves inside (501), two inlet passages (113), two outlet ring grooves (504) and two exhaust passages (505); the two inlet ring grooves (501) pass through two inlet passages ( 113) is communicated with the outer inlet ring groove (112), the two exhaust passages (505) are both communicated with the exhaust port (13), and the two inlet ring grooves (501) are connected with each set of inlet passages (113). A pressure-maintaining diaphragm mechanism for controlling the communication or disconnection between the intake ring groove (501) and the set of intake passages (113) is respectively arranged between them; the two sets of intake passages (113) are respectively connected with one The air outlet ring grooves (504) are communicated with each other, each air outlet ring groove (504) is communicated with an exhaust passage (505), and each air outlet ring groove (504) is respectively connected with the left air outlet (121) and the right air outlet ( 122) is communicated; between each exhaust passage (505) and the corresponding outlet ring groove (504), there is a device for controlling the communication or disconnection between the exhaust passage (505) and the corresponding outlet ring groove (504). A pressure-reducing diaphragm mechanism that is open and communicated; a pressure-maintaining passage for controlling the pressure-maintaining diaphragm mechanism is provided between the outer air inlet ring groove (112) and the pressure-maintaining diaphragm mechanism, and a pressure-maintaining solenoid valve in the ABS solenoid valve (2 01) Set on the pressure maintaining passage to control the connection or disconnection of the pressure maintaining passage; between the outer air inlet ring groove (112) and the pressure reducing diaphragm mechanism, there is a pressure reducing valve for controlling the pressure reducing diaphragm mechanism. pressure passage, the pressure reducing solenoid valve (202) in the ABS solenoid valve is arranged on the pressure reducing passage to control the connection or disconnection of the pressure reducing passage; wherein, the pressure maintaining solenoid valve (201) is normally open, and the pressure reduction The solenoid valve (202) is normally closed; the control air port (14) is connected to the air outlet of the external brake valve, the air inlet (11) is connected to the external air storage cylinder, and the left air outlet (121) is connected to the external left air cylinder. The brake air chamber is connected, and the right air outlet (122) is connected to the external right brake air chamber. 2. A dual-channel ABS rear axle brake module assembly for commercial vehicles according to claim 1, characterized in that, the valve control mechanism is composed of a guide rod (151), a piston assembly ( 152) and a control chamber (141); wherein, the control chamber (141) communicates with the control air port (14), and the piston assembly (152) moves up and down along the guide rod (151); the valve mechanism is composed of a valve seat (161) ), a valve (162), a valve return spring (163) and a spring seat (164); the valve (162) is closely attached to the valve seat (161) under the action of the valve return spring (163); The valve return spring (163) is fixed on the spring seat (164). 3. A dual-channel ABS rear axle brake module assembly for commercial vehicles according to claim 1, characterized in that, each group of air intake passages (113) in the intermediate valve body assembly (1) consists of a The first intake port (502) is connected with a second intake port (503); the intake ring groove (501) is communicated with the first intake port (502), and the second intake port (503) is connected with The outlet ring groove (504) communicates. 4. The dual-channel ABS rear axle braking module assembly for commercial vehicles according to claim 2, wherein the ABS solenoid valve further comprises a base plate assembly (203), which is connected to an external vehicle ABS controller and control the connector assembly (204) and the casing (205) connecting the pressure maintaining solenoid valve (201) and the pressure reducing solenoid valve (202); the part of the casing (205) close to the side of the middle valve body is the casing body back plate (206); the connector assembly (204) is enclosed in the casing (205) together with the pressure maintaining solenoid valve (201) and the pressure reducing solenoid valve (202); the base plate assembly (203) is located at between the casing back plate (206) and the intermediate valve body assembly (1); the casing back plate (206) and the bottom plate assembly (203) and the intermediate valve body assembly (1) are fixedly connected by bolts; the pressure maintaining The solenoid valve (201) consists of a pressure maintaining solenoid valve cover (211), a pressure maintaining valve (212), a pressure maintaining moving iron core spring (213), a pressure maintaining moving iron core (214), a pressure maintaining coil winding (215) and The pressure-retaining static iron cores (216) are connected in sequence; the pressure-reducing solenoid valve (202) is composed of a pressure-reducing electromagnetic valve blocking cover (221), a pressure-reducing valve (222), a pressure-reducing moving iron core spring (223), a reducing The pressing iron core (224), the decompression coil winding (225), and the decompression static iron core (226) are connected in sequence; the bottom plate assembly (203) includes a bottom plate (231), a pressure maintaining membrane mechanism and a decompression membrane Sheet mechanism; a plurality of recessed grooves are provided on the surface of the bottom plate (231) close to the casing back plate (206), the bottom plate (231) is fitted with the casing back plate (206), and the grooves are in contact with the casing back plate (206). A plurality of channels are formed between the plates (206); the pressure maintaining diaphragm mechanism includes a pressure maintaining diaphragm (233) and a pressure maintaining diaphragm spring (234); the pressure reducing diaphragm mechanism includes a pressure reducing diaphragm (235) ) and a pressure reducing diaphragm spring (236); the pressure maintaining diaphragm (233) and the pressure reducing diaphragm (235) are both arranged between the bottom plate (231) and the intermediate valve body assembly (1); The cavity between the diaphragm (233) and the bottom plate (231) forms a pressure maintaining diaphragm action chamber (520), and the pressure maintaining diaphragm spring (234) is arranged between the pressure maintaining diaphragm (233) and the bottom plate (231) The cavity between the decompression diaphragm (235) and the bottom plate (231) forms a decompression diaphragm action chamber (528), and the decompression diaphragm spring (236) is arranged between the decompression diaphragm (235) and the bottom plate (231). ); the pressure maintaining diaphragm (233) is arranged between the inlet ring groove (501) and the first inlet passage (502) for controlling the inlet ring groove (501) and the first inlet passage ( 502) is connected or disconnected; the decompression diaphragm (235) is arranged between the exhaust channel (505) and the gas outlet ring groove (504) to control the exhaust channel (505) and the gas outlet ring groove The connection or disconnection of (504); the pressure maintaining passage includes a pressure maintaining intake passage of the ABS solenoid valve and a pressure maintaining exhaust passage of the ABS solenoid valve; the decompression passage includes The decompression intake passage of the ABS solenoid valve and the decompression exhaust passage of the ABS solenoid valve; the pressure maintaining intake passage of the ABS solenoid valve comprises a pressure maintaining intake passage (511), a first pressure maintaining intake air, which are sequentially communicated. port (512), second pressure maintaining air inlet (513), third pressure maintaining air inlet (514), fourth pressure maintaining air inlet (515), fifth pressure maintaining air inlet (516), Six pressure-maintaining air inlets (517), seventh pressure-retaining air inlets (518) and eighth pressure-retaining air inlets (519); the pressure-retaining air inlet passage (511) and the outer air inlet ring groove (112) ) is connected, the first pressure maintaining air inlet (512) and the second pressure maintaining air inlet (513) are connected through a channel, the seventh pressure maintaining air inlet (518) and the eighth pressure maintaining air inlet (519) The eighth pressure-maintaining air inlet (519) communicates with the pressure-retaining diaphragm action chamber (520) through a channel; the decompression air inlet passage of the ABS solenoid valve includes the first decompression air inlet (519) which are connected in sequence. 521), the second decompression air inlet (522), the third decompression air inlet (523), the fourth decompression air inlet (524), the fifth decompression air inlet (525), the sixth decompression air inlet (525), a pressure air inlet (526) and a seventh decompression air inlet (527); the first decompression air inlet (521) and the first pressure maintaining air inlet (512) are communicated through a channel, and the sixth decompression air inlet (521) The pressure air inlet (526) and the seventh decompression air inlet (527) are communicated through a channel, and the seventh decompression air inlet (527) is communicated with the decompression diaphragm action chamber (528); the ABS solenoid valve The pressure-maintaining exhaust passage includes a first pressure-maintaining exhaust port (531), a second pressure-maintaining exhaust port (532), and a pressure-maintaining and decompression common exhaust port (544) that are communicated in sequence; the second pressure-maintaining exhaust port (544) The port (532) is communicated with the pressure maintaining and decompression common exhaust port (544) through a channel; the decompression and exhaust passage of the ABS solenoid valve includes a first decompression exhaust port (541), a second decompression exhaust port (541), a second decompression exhaust port (541), and a second The pressure exhaust port (542), the third decompression exhaust port (543), and the pressure-retaining and decompression common exhaust port (544); the third decompression exhaust port (543) and the pressure-holding and decompression common exhaust port (544) is communicated through a channel, and the pressure maintaining and decompression common exhaust port (544) is communicated with the exhaust port (13) through a pressure maintaining and decompression common exhaust channel (545) inside the intermediate valve body assembly (1); The pressure maintaining valve (212) controls the connection and disconnection of the fourth pressure maintaining air inlet (515) and the fifth pressure maintaining air inlet (516); the pressure maintaining moving iron core (214) controls the fifth pressure maintaining air inlet (514). The connection and disconnection between the pressure air inlet (516) and the first pressure maintaining exhaust port (531); the pressure reducing valve (222) controls the first pressure reducing exhaust port (541) and the fourth pressure reducing air intake The connection and disconnection of the port (524); the decompression moving iron core (224) controls the connection and disconnection of the fourth decompression air inlet (524) and the third decompression air inlet (523). 5. A dual-channel ABS rear axle brake module assembly for commercial vehicles according to claim 2, characterized in that the first pressure maintaining air inlet (512) and the second pressure maintaining air inlet (513) are In the passage between the seventh pressure maintaining air inlet (518) and the eighth pressure maintaining air inlet (519), the first decompression air inlet (521) and the first pressure maintaining air inlet In the passage between (512), in the passage between the fifth decompression inlet (525) and the sixth decompression inlet (526), and in the third decompression exhaust port (543) and the maintaining pressure A sealing ring (232) for strengthening sealing is provided in the passages between the pressure common exhaust ports (544). 6. The dual-channel ABS rear axle brake module assembly for commercial vehicles according to claim 4, wherein the connector assembly (204) comprises a connector grounding end (261), a pressure-holding end The pressure maintaining coil winding (215) in the solenoid valve (201) is connected to and controls the pressure maintaining solenoid valve control end (262) of the pressure maintaining solenoid valve (201) and the pressure reducing coil winding (262) in the pressure reducing solenoid valve (202). 225) Connect and control the pressure reducing solenoid valve control end (263) of the pressure reducing solenoid valve (202); the grounding end (261) of the connector, the pressure maintaining solenoid valve control end (262) and the pressure reducing solenoid valve control end (263) all protrude from the inside of the casing (205) to the outside of the casing (205). 7. A dual-channel ABS rear axle brake module assembly for commercial vehicles according to claim 4, characterized in that the air intake channel (113), the pressure-maintaining air-intake channel (511), the pressure-maintaining and decompressing The common exhaust passage (545) is provided inside the intermediate valve body assembly (1); the third pressure-maintaining air inlet (514), the sixth pressure-maintaining air inlet (517), and the second decompression air inlet ( 522), the fifth decompression air inlet (525), the second pressure maintaining exhaust port (532) and the second decompression exhaust port (542) are arranged on the outer surface of the shell back plate (206); The fourth pressure maintaining air inlet (515), the fifth pressure maintaining air inlet (516), the third decompression air inlet (523), the fourth decompression air inlet (524), the first pressure maintaining exhaust The air port (531) and the first decompression and exhaust port (541) are arranged on the inner surface of the casing back plate (206); the first pressure-maintaining air inlet (512) and the second pressure-maintaining air inlet (512) (513), the seventh pressure-retaining air inlet (518), the eighth pressure-retaining air inlet (519), the first decompression air inlet (521), the sixth decompression air inlet (526), the seventh decompression air inlet (526) A decompression air inlet (527), a third decompression air outlet (543), and a pressure-maintaining and decompression common air outlet (544) are provided on the bottom plate (231); wherein the fourth pressure-maintaining air inlet (543) (515) and the third pressure maintaining air inlet (514) are respectively two ports of the same through hole on the back plate of the casing (206), the fifth pressure maintaining air inlet (516) and the sixth pressure maintaining air intake The ports (517) are respectively two ports of the same through hole on the casing backplane (206), and the third decompression air inlet (523) and the second decompression air inlet (522) are respectively the casing backplate (206) Two ports of the same through hole, the fourth decompression air inlet (524) and the fifth decompression air inlet (525) are respectively two of the same through hole on the back plate of the casing (206) The first pressure maintaining exhaust port (531) and the second pressure maintaining exhaust port (532) are respectively two ports of the same through hole on the shell back plate (206), and the first pressure reducing exhaust port ( 541) and the second decompression exhaust port (542) are respectively two ports of the same through hole on the housing backplane (206); the housing backplane (206) is installed in close contact with the base plate assembly (203) Afterwards, the third pressure maintaining air inlet (514) and the second pressure maintaining air inlet (513) are opposite and communicate with each other, and the sixth pressure maintaining air inlet (517) is opposite to the seventh pressure maintaining air inlet (518) and communicate with each other, the second decompression air inlet (522) and the first decompression air inlet (521) are opposite and communicate with each other, the fifth decompression air inlet (525) and the sixth decompression air inlet (526) ) are opposite and communicate with each other, the second pressure maintaining exhaust port (532) is aligned with the channel between the third pressure reducing exhaust port (543) and the pressure maintaining and decompression common exhaust port (544) and communicates with the channel, The second decompression exhaust port (542) and the third decompression exhaust port (543) are opposed to each other and communicate with each other. 8 . The dual-channel ABS rear axle brake module assembly for commercial vehicles according to claim 4 , wherein the pressure maintaining valve ( 212 ) is provided with a fourth pressure maintaining air inlet along the axis direction. 9 . (515) a pressure maintaining valve groove communicating with the fifth pressure maintaining air inlet (516); a rectangular groove is formed on the outside of the pressure maintaining moving iron core (214); the axis of the pressure maintaining static iron core (216) There is a hollow channel; the hollow channel of the pressure maintaining static iron core (216) is always communicated with the first pressure maintaining exhaust port (531); when the pressure maintaining moving iron core (214) moves to a position close to the pressure maintaining valve (212) ) side, the rear end face of the pressure maintaining moving iron core (214) blocks the opening of the pressure maintaining valve groove close to the fifth pressure maintaining air inlet (516) side, the pressure maintaining valve (212) is closed, and the fourth pressure maintaining The communication between the air inlet (515) and the fifth pressure maintaining air inlet (516) is disconnected, and the front end face of the pressure maintaining movable iron core (214) is separated from the rear end face of the pressure maintaining static iron core (216), so as to keep the pressure maintained. The hollow passage of the pressure-holding iron core (216) is communicated with the rectangular groove of the pressure-holding moving iron core (214), and the fifth pressure-holding air inlet (516) passes through the rectangular groove of the pressure-holding moving iron core (214) and the holding force. The hollow passage of the static pressure iron core (216) is communicated with the first pressure maintaining exhaust port (531); when the pressure maintaining movable iron core (214) moves to the side away from the pressure maintaining valve (212), the pressure maintaining movable iron core (214) moves to the side away from the pressure maintaining valve (212). The rear end face of the core (214) leaves the groove of the pressure maintaining valve and is close to the opening on the side of the fifth pressure maintaining air inlet (516), the pressure maintaining valve (212) is opened, the fourth pressure maintaining air inlet (515) and the fifth pressure maintaining air inlet (515) The pressure maintaining air inlet (516) is communicated, and the rear end surface of the pressure maintaining moving iron core (214) is attached to the front end surface of the pressure maintaining static iron core (216) and blocks the hollow passage of the pressure maintaining static iron core (216) close to the pressure maintaining The opening on one side of the moving iron core (214), the communication between the rectangular groove of the pressure maintaining moving iron core (214) and the hollow passage of the pressure maintaining static iron core (216) is disconnected, and the fifth pressure maintaining air inlet The communication between (516) and the first pressure maintaining and exhaust port (531) is disconnected; the pressure reducing valve (222) is opened along the axis direction to connect the first pressure reducing exhaust port (541) with the fourth pressure reducing exhaust port (541) The decompression valve groove communicated with the decompression air inlet (524) has a rectangular groove on the outside of the decompression moving iron core (224), a hollow channel on the axis of the decompression static iron core (226), and the decompression static iron core (226). The hollow passage of (226) is always communicated with the third decompression air inlet (523); when the decompression movable iron core (224) moves to the side close to the decompression valve (222), the decompression movable iron core (224) The rear end face of ) blocks the opening of the pressure reducing valve groove close to the fourth pressure reducing air inlet (524), the pressure reducing valve (222) is closed, and the first pressure reducing exhaust port (541) is connected to the fourth pressure reducing air inlet (524). The communication between the air ports (524) is disconnected, the front end face of the decompression moving iron core (224) is separated from the rear end face of the decompression static iron core (226), and the hollow passage of the decompression static iron core (226) is connected to the decompression static iron core (226). The rectangular groove of the pressing iron core (224) is communicated, and the third decompression air inlet (523) passes through the decompression static iron core The hollow passage of (226) and the rectangular groove of the decompression movable iron core (224) communicate with the fourth decompression air inlet (524); when the decompression movable iron core (224) is located and moved away from the decompression valve (222) ) side, the rear end face of the decompression moving iron core (224) leaves the groove of the decompression valve and is close to the opening on the side of the fourth decompression air inlet (524), the decompression valve (222) is opened, and the first decompression valve (222) is opened. The exhaust port (541) communicates with the fourth decompression air inlet (524), and the front end surface of the decompression moving iron core (224) is attached to the rear end surface of the decompression static iron core (226) and blocks the decompression static iron core (226). The hollow channel of the iron core (226) is close to the opening on the side of the decompression movable iron core (224), and the communication between the rectangular groove of the decompression movable iron core (224) and the hollow channel of the decompression static iron core (226) is reduced is disconnected, and the communication between the third decompression air inlet (523) and the fourth decompression air inlet (524) is disconnected.

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