WO2024077699A1

WO2024077699A1 - Parking relay valve and parking braking system

Info

Publication number: WO2024077699A1
Application number: PCT/CN2022/131033
Authority: WO
Inventors: 陈锋; 福克斯安德拉斯; 克拉博特马加什; 胡斐; 陈钢强
Original assignee: 浙江万安科技股份有限公司
Priority date: 2022-10-10
Filing date: 2022-11-10
Publication date: 2024-04-18
Also published as: CN115610399A

Abstract

The present invention discloses a parking relay valve and a parking braking system, which relate to the technical field of vehicle braking devices. The parking relay valve comprises a valve housing, a main piston and a supplying piston. The valve housing is provided with a parking cavity, a control cavity and an ejection functional cavity which are arranged in sequence. The main piston comprises a piston rod and a piston block. The piston rod passes through the control cavity and the ejection functional cavity. The piston block is arranged in the control cavity. A main spring acting on the piston block is arranged in the control cavity. The parking cavity is provided with a first port connected to a PB system. The control cavity is divided by the piston block into a PB braking sub-cavity and a PB control sub-cavity. The ejection functional cavity is provided with an ejection sliding block sleeved on the piston rod and an ejection spring acting on the ejection sliding block. The ejection sliding block can drive the main piston to move synchronously. The ejection functional cavity is divided by the ejection sliding block into an environment pressure sub-cavity and an ejection control sub-cavity. Automatic braking can be achieved through the ejection functional cavity when the pressure of the braking loop decreases to a certain degree, so that the vehicle can stop moving in time, and the safety of the traveling vehicle is improved.

Description

Parking relay valve and parking brake system

Technical Field

The present invention relates to the technical field of vehicle brake equipment, in particular to a parking relay valve. In addition, the present invention also relates to a parking brake system using the parking relay valve.

Background technique

For safety reasons, the existing large vehicle brakes have three states: driving state, driving brake state and parking brake state. The brake circuit used to achieve braking is generally provided with a main and a secondary brake circuit. When the main brake circuit is abnormal or fails, the secondary brake circuit compensates for the main brake so that the vehicle can brake smoothly. The relay valve is an important component of the vehicle air brake system. In the air brake system of large vehicles, the relay valve plays a role in shortening the reaction time and the pressure building time. The structure of the existing relay valve is relatively complex. When the vehicle's brake system is abnormal and the pressure of the brake circuit drops, the structure of the self-braking achieved by the relay valve is relatively complex and cannot respond quickly to achieve the self-braking function.

Summary of the invention

In order to solve the shortcomings and deficiencies in the above-mentioned prior art, the present invention provides a parking relay valve, which is equipped with a pop-up function chamber. When the maximum pressure of the service brake circuit is too small, the PB chamber of the brake cylinder is connected to the discharge channel of the supply piston, thereby achieving the purpose of self-braking and improving the driving safety of the vehicle.

In order to achieve the above technical purpose, the parking relay valve provided by the present invention is used for air braking of a vehicle, and comprises a valve housing, a main piston and a supply piston.

The valve housing is provided with a parking chamber, a control chamber and a pop-up function chamber which are distributed in sequence;

The main piston includes a piston rod and a piston block arranged at one end of the piston rod, the piston rod is inserted into the control cavity and the ejection function cavity, the piston block is arranged in the control cavity, and a main spring acting on the piston block is arranged in the control cavity;

The parking chamber is provided with a first port connected to the PB system;

The control chamber is divided into a PB brake chamber and a PB control chamber by the piston block. The PB brake chamber is provided with a second port connected to the PB chamber of the brake cylinder, and the PB control chamber is provided with a third port connected to the parking control element.

The supply piston passes through the parking chamber and extends into the PB brake chamber. The supply piston is used to control the on-off between the parking chamber and the PB brake chamber and is provided with a discharge channel that can communicate with the PB brake chamber. The parking chamber is provided with a secondary spring that acts on the supply piston.

The pop-up function chamber is provided with a pop-up slider sleeved on the piston rod and a pop-up spring acting on the pop-up slider, the pop-up slider can drive the main piston to move synchronously, the pop-up function chamber is divided into an ambient pressure chamber and a pop-up control chamber by the pop-up slider, the ambient pressure chamber is provided with a fourth port connected to the external air, and the pop-up control chamber is provided with a fifth port connected to the service brake circuit;

When the pressure in the PB control chamber decreases, the main spring drives the piston block to move, so that the PB chamber of the brake cylinder is connected to the discharge channel of the supply piston, thus achieving braking;

When the pressure in the PB control chamber increases, the piston block drives the supply piston to move, so that the PB system is connected with the PB chamber of the brake cylinder to achieve release;

When the maximum pressure of the service brake circuit drops to a first preset value, the pop-up spring drives the main piston to move and release the supply piston through the pop-up slider, so that the PB chamber of the brake cylinder is connected to the discharge channel of the supply piston to achieve self-braking.

Preferably, a portion of the piston rod located in the pop-up function cavity is provided with a protrusion that can abut against and cooperate with the pop-up slider.

Preferably, the first preset value is 40PSI.

Preferably, the valve housing is provided with a mixing function chamber.

The piston rod passes through the mixing function chamber, and a proportional slider sleeved on the piston rod and a proportional spring acting on the proportional slider are arranged in the mixing function chamber, and the proportional slider can drive the main piston to move synchronously;

The hybrid function chamber is divided into a proportional control chamber and a main brake chamber by a proportional slider, the proportional control chamber is provided with a sixth port connected to the auxiliary service brake circuit, and the main brake chamber is provided with a seventh port connected to the main brake circuit;

When the maximum pressure of the main brake circuit drops to a second preset value, the proportional spring drives the main piston to move and release the supply piston through the proportional slider, and the PB chamber of the brake cylinder is depressurized through the discharge channel of the supply piston to balance the pressure with the PB system.

Preferably, the second preset value is 60PSI.

Preferably, the portion of the piston rod located in the mixing function chamber is provided with a convex ring portion that can abut against the proportional slider.

The present invention also provides a parking brake system for air braking of a self-powered vehicle, wherein the parking brake system comprises the parking relay valve described above.

The present invention also provides a parking brake system for air braking of a vehicle with a trailer, the parking brake system comprising the two parking relay valves described above, one of which is arranged on the brake circuit of the trailer, and the other is arranged on the brake circuit of the vehicle.

After adopting the above technical solution, the present invention has the following advantages:

1. The parking relay valve provided by the present invention has a valve housing provided with a parking chamber, a control chamber and a pop-up function chamber. The ambient pressure sub-chamber of the pop-up function chamber is connected to the external air, and the pop-up control sub-chamber is connected to the service brake circuit. When a fault occurs in the service brake circuit and causes the maximum pressure to drop to a first preset value, the pop-up spring acts on the pop-up slider, causing the pop-up slider to drive the main piston to release the supply piston, thereby connecting the PB chamber of the brake cylinder to the discharge channel of the supply piston, reducing the pressure in the PB chamber of the brake cylinder, and the brake implements self-braking to achieve the purpose of automatic parking. The pop-up function chamber can realize self-braking when the pressure in the brake circuit is reduced to a certain extent, so that the vehicle can stop moving in time, thereby improving the safety of the vehicle during driving.

2. Furthermore, a mixed function chamber is provided in the valve housing. When a fault occurs in the main brake circuit causing the maximum pressure to drop to a second preset value, the proportional spring acts on the proportional slider, causing the pop-up slider to drive the main piston to move, and the main piston releases the supply piston. The PB chamber of the brake cylinder is connected to the discharge channel of the supply piston, and the pressure in the PB chamber is reduced to balance with the supply pressure of the PB system, so that the brake system can brake according to the pressure conditions of the auxiliary brake circuit, so that the pressure of the auxiliary brake circuit meets the braking requirements.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the internal structure of a type I parking relay valve in Embodiment 1;

FIG2 is a schematic diagram of the internal structure of a type II parking relay valve in Embodiment 2;

FIG3 is a schematic diagram of a parking brake system in Embodiment 3;

FIG. 4 is a schematic diagram of a parking brake system in a fourth embodiment.

In the figure, 100A-type I parking relay valve, 100B-type II parking relay valve, 110-valve housing, 120-main piston, 121-piston rod, 122-piston block, 123-protrusion, 124-convex ring, 130-supply piston, 131-discharge channel, 140-parking chamber, 141-first port, 150-control chamber, 151-PB brake chamber, 152-PB control chamber, 153-second port, 154-third port, 160-pop-up function chamber, 161-ambient pressure chamber, 162-pop-up control chamber, 163-pop-up slider, 164-fourth port, 165-fifth port, 171-main spring, 172-auxiliary spring, 173-pop-up spring, 174-proportional spring, 180-connecting channel, 190-mixing function chamber, 191-proportional control chamber, 192-main brake chamber, 193-proportional slider, 194-sixth port, 195-seventh port.

Detailed ways

The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following words indicating orientation or positional relationship such as "upper", "lower", "left", "right", "longitudinal", "lateral", "inner", "outer", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device/element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

Embodiment 1

As shown in FIG1 , a type I parking relay valve 100A provided in the first embodiment of the present invention is used for air braking of a vehicle and includes a valve housing 110 , a main piston 120 and a supply piston 130 .

The valve housing 110 is provided with a parking chamber 140, a control chamber 150 and a pop-up function chamber 160 which are sequentially distributed from bottom to top;

The main piston 120 includes a piston rod 121 and a piston block 122 disposed at one end of the piston rod 121. The piston rod 121 penetrates the control chamber 150 and the pop-up function chamber 160. The piston block 122 is disposed in the control chamber 150. A main spring 171 acting on the piston block 122 is disposed in the control chamber 150.

The parking chamber 140 is provided with a first port 141 connected to the PB system;

The control chamber 150 is divided into a PB brake chamber 151 and a PB control chamber 152 by the piston block 122. The PB brake chamber 151 is provided with a second port 153 connected to the PB chamber of the brake cylinder, and the PB control chamber 152 is provided with a third port 154 connected to the parking control element.

The supply piston 130 passes through the parking chamber 140 and extends into the PB brake chamber 151. The supply piston 130 is used to control the connection and disconnection between the parking chamber 140 and the PB brake chamber 151 and is provided with a discharge channel 131 that can communicate with the PB brake chamber 151. The parking chamber 140 is provided with a secondary spring 172 that acts on the supply piston 130.

The pop-up function chamber 160 is provided with a pop-up slider 163 sleeved on the piston rod 121 and a pop-up spring 173 acting on the pop-up slider 163. The pop-up slider 163 can drive the main piston 120 to move synchronously. The pop-up function chamber 160 is divided into an ambient pressure chamber 161 and a pop-up control chamber 162 by the pop-up slider 163. The ambient pressure chamber 161 is provided with a fourth port 164 communicating with the external air, and the pop-up control chamber 162 is provided with a fifth port 165 connected with the service brake circuit.

When the pressure of the PB control chamber 152 decreases, the main spring 171 drives the upward piston block 122 to move, so that the PB chamber of the brake cylinder is connected to the discharge channel 131 of the supply piston 130, thereby achieving braking;

When the pressure in the PB control sub-chamber 152 increases, the piston block 122 drives the supply piston 130 to move downward, so that the PB system is connected with the PB chamber of the brake cylinder to achieve release;

When the maximum pressure of the service brake circuit drops to a first preset value, the pop-up spring 173 drives the main piston 120 to move upward through the pop-up slider 163 and releases the supply piston 130, so that the PB chamber of the brake cylinder is connected to the discharge channel 131 of the supply piston 130 to achieve self-braking.

In order to enable the pop-up slider 163 to smoothly drive the main piston 120 to move upward and release the supply piston 130, the piston rod 121 is provided with a protrusion 123 in the pop-up function chamber 160 that can abut against the pop-up slider 163. In this embodiment, the pop-up slider 163 is provided with a hole for the upper end of the piston rod 121 to pass through, and the top of the piston rod 121 is provided with a convex ring forming the protrusion 123, and the outer diameter of the convex ring is larger than the inner diameter of the hole on the pop-up slider 163 for the piston rod 121 to pass through.

The type I parking relay valve 100A of this embodiment is mainly used for braking of trailers. The air pressure of the service brake circuit is consistent with the air pressure of the service brake circuit in the tractor. The air pressure of the service brake circuit includes the air pressure of the main service brake circuit and the air pressure of the auxiliary service brake circuit. The first preset value is specifically 40PSI.

A communication channel 180 is provided between the parking chamber 140 and the PB brake chamber 151 of the control chamber 150, and a part of the supply piston 130 is located in the communication channel 180. The supply piston 130 can move downward and leave the valve housing 110 under the resistance of the main piston 120. At this time, the parking chamber 140 and the PB brake chamber 151 can be connected through the communication channel 180, so that the first port 141 and the second port 153 are connected, and the supply pressure of the PB system can be output to the PB chamber of the brake cylinder through the first port 141, the parking chamber 140, the communication channel 180, the PB brake chamber 151 and the second port 153. When the pressure of the first port 141 and the second port 153 reaches equilibrium, the supply piston 130 is reset under the action of the secondary spring 172, the supply piston 130 is in resistance with the valve housing 110, the communication channel 180 is closed by the supply piston 130, and the PB system and the PB chamber of the brake cylinder are disconnected, realizing the switch from parking to release.

When parking is required, the air in the PB control chamber 152 is discharged, the air pressure in the PB control chamber 152 is reduced, the main piston 120 moves upward under the elastic force of the main spring 171, the main piston 120 releases the supply piston 130, the PB brake chamber 151 is connected to the discharge channel 131 of the supply piston 130, the PB chamber of the brake cylinder is connected to the discharge channel 131 through the first port 141 and the PB brake chamber 151, the air in the PB chamber of the brake cylinder can be discharged through the first port 141, the PB brake chamber 151 and the discharge channel 131, and the air pressure in the PB chamber of the brake cylinder is reduced. When the air pressure in the PB brake chamber 151 is reduced to the point where the main piston 120 falls back to contact the supply piston 130, the air pressure in the PB chamber of the brake cylinder reaches the minimum, at which time the brake holds the wheel tightly, realizing the switch from release to parking.

When the air pressure of the service brake circuit is lower than the first preset value, it indicates that the service brake circuit has a fault. At this time, the air pressure in the pop-up control chamber 162 is reduced, and the pop-up spring 173 acts on the pop-up slider 163, so that the pop-up slider 163 drives the main piston 120 to move upward to release the supply piston 130. The PB brake chamber 151 is connected to the discharge channel 131 of the supply piston 130. The PB chamber of the brake cylinder can be connected to the discharge channel 131 through the first port 141 and the PB brake chamber 151. The air in the PB chamber of the brake cylinder can be discharged through the first port 141, the PB brake chamber 151 and the discharge channel 131, and the air pressure in the PB chamber of the brake cylinder is reduced. When the air pressure in the PB brake chamber 151 is reduced to the point where the main piston 120 falls back to contact the supply piston 130, the air pressure in the PB chamber of the brake cylinder reaches the minimum. At this time, the brake holds the wheel tightly, and the brake implements self-braking to achieve the purpose of automatic parking. The pop-up function chamber 160 realizes self-braking when the pressure in the brake circuit is reduced to a certain extent, so that the vehicle can stop moving in time, improving the safety of the vehicle when driving.

It is understandable that the first preset value may also be slightly greater than 40 PSI.

Embodiment 2

In conjunction with FIG. 2 , this embodiment discloses a type II parking relay valve 100B. The type II parking relay valve 100B of this embodiment is provided with a mixing function chamber 190 based on the structure of the first embodiment. The mixing function chamber 190 is located between the control chamber 150 and the pop-up function chamber 160. In this embodiment, the piston rod 121 of the main piston 120 passes through the mixing function chamber 190. The mixing function chamber 190 is provided with a proportional slider 193 sleeved on the piston rod 121 and a proportional spring 174 acting on the proportional slider 193. The proportional slider 193 can drive the main piston 120 to move upward synchronously. The mixing function chamber 190 is divided into a proportional control chamber 191 and a main brake chamber 192 by the proportional slider 193. The proportional control chamber 191 is provided with a sixth port 194 connected to the auxiliary service brake circuit, and the main brake chamber 192 is provided with a seventh port 195 connected to the main brake circuit. When the maximum pressure of the main brake circuit drops to a second preset value, the proportional spring 174 drives the main piston 120 to move upward and release the supply piston 130 through the proportional slider 193, and the PB chamber of the brake cylinder is depressurized through the discharge channel 131 of the supply piston 130 to balance the supply pressure of the PB system.

The type II parking relay valve 100B of this embodiment is mainly used for air brakes of self-powered vehicles. The air pressure of the service brake circuit includes the air pressure of the main service brake circuit and the air pressure of the auxiliary service brake circuit. The second preset value is specifically 60PSI.

When a fault occurs in the main brake circuit and the maximum pressure drops to a second preset value, the pressure of the brake cylinder PB chamber is reduced to balance with the supply pressure of the PB system, so that the PB system can brake according to the pressure of the auxiliary brake circuit, so that the pressure of the auxiliary brake circuit meets the braking requirements. Further, when the maximum pressure of the main brake circuit drops to the second preset value, the air pressure in the main brake chamber 192 is reduced, the proportional spring 174 acts on the proportional slider 193 to move the proportional slider 193 upward, and the proportional slider 193 drives the main piston 120 to move upward, so that the main piston 120 releases the supply piston 130, and the PB brake chamber 151 is connected to the discharge channel 131 of the supply piston 130, and the PB chamber of the brake cylinder is connected to the discharge channel 131 through the first port 141 and the PB brake chamber 151. The air in the brake cylinder PB chamber can be discharged through the first port 141, the PB brake chamber 151 and the discharge channel 131, and the air pressure in the brake cylinder PB chamber is reduced. When the air pressure in the PB brake chamber 151 decreases to the point where the main piston 120 falls back to contact the supply piston 130, the control pressure of the brake cylinder PB chamber reaches a balance with the supply pressure of the PB system, so that the air pressure of the PB system can meet the braking requirements of the brake cylinder, thereby allowing the brake to be applied smoothly when needed.

In order to enable the proportional slider 193 to smoothly drive the main piston 120 to move upward to release the supply piston 130, the piston rod 121 is provided with a convex ring portion 124 in the mixing function chamber 190 that can abut against the proportional slider 193. In this embodiment, the proportional slider 193 is provided with a hole for the piston rod 121 to pass through, and the outer diameter of the convex ring portion 124 is greater than the inner diameter of the hole on the proportional slider 193 for the piston rod 121 to pass through.

The other structures of the second embodiment are the same as those of the first embodiment and will not be described again here.

It is understandable that the second preset value may also be slightly greater than 60PSI.

Embodiment 3

3 , this embodiment provides a parking brake system for air braking of a self-powered vehicle. The parking brake system includes the type II parking relay valve 100B in the second embodiment.

In this embodiment, the parking brake system includes two solenoid valves MV1 and MV2. Both solenoid valves MV1 and MV2 are provided with two ports and two states. Both battery valves MV1 and MV2 are in a closed state under normal conditions. Only when the solenoid valve is activated, the two ports of the solenoid valve are connected. In FIG3, P1 represents the supply pressure of the PB system, P2 represents the pressure requirement of the secondary service brake, P3 represents the pressure of the main service brake circuit, and P4 represents the pressure of the auxiliary service brake circuit. The two solenoid valves, the type II parking relay valve 100B and P2 are connected through the high selector valve SH1, and P3 and P4 are connected to the type II parking relay valve 100B through the high selector valve SH2, so as to control the gas flow state of the type II parking relay valve 100B according to the pressure requirement.

When the vehicle switches from the parking state to the release state, the battery valve MV1 is activated, and the supply pressure switches the high selector valve SH1 to the control side so as to fill the PB control chamber 152 in the type II parking relay valve 100B. The air pressure in the PB control chamber 152 increases, so that the main piston 120 drives the supply piston 130 to move downward and leave the valve housing 110. The supply pressure of the PB system can be output to the PB chamber of the brake cylinder through the first port 141, the parking chamber 140, the connecting channel 180, the PB brake chamber 151 and the second port 153. When the pressure of the first port 141 and the second port 153 reaches equilibrium, the supply piston 130 is reset under the action of the secondary spring 172, so that the supply piston 130 conflicts with the valve housing 110, the connecting channel 180 is closed by the supply piston 130, and the PB system and the PB chamber of the brake cylinder are disconnected, realizing the switch from parking to release.

When the vehicle switches from the release state to the parking state, P2 is 0, the control volumes of the two solenoid valves MV1 and MV2 are connected, the solenoid valve MV2 is activated, the air in the PB control chamber 152 is released, the air pressure in the PB control chamber 152 decreases, the main piston 120 moves upward under the elastic force of the main spring 171, the main piston 120 releases the supply piston 130, the PB brake chamber 151 is connected to the discharge channel 131 of the supply piston 130, the air in the PB chamber of the brake cylinder can be discharged through the first port 141, the PB brake chamber 151 and the discharge channel 131, and the air pressure in the PB chamber of the brake cylinder decreases. When the air pressure in the PB brake chamber 151 decreases to the point where the main piston 120 falls back to contact the supply piston 130, the air pressure in the PB chamber of the brake cylinder reaches the minimum, at which time the brake holds the wheel tightly, realizing the switch from release to parking.

Since the parking brake system and the service brake system use the same brake to achieve parking and release, when the parking brake system and the service brake system act on the brake at the same time, the pressure in the brake PB chamber is too high, which will cause the brake to explode. Based on this, the type II parking relay valve 100B of this embodiment also has an anti-compounding function. Specifically, when the anti-compounding function needs to be activated, the control amount between the solenoid valve MV1, the solenoid valve MV2 and the high-selection valve SH1 is the ambient pressure. After the driver steps on the service brake pedal, the pressure switches the high-selection valve SH1 to the pressure demand side of the auxiliary service brake circuit, and the air pressure in the PB control chamber 152 increases, so that the main piston 120 drives the supply piston 130 to move downward and leave the valve housing 110. The supply pressure of the PB system can reach the PB chamber of the brake cylinder through the first port 141, the parking chamber 140, the connecting channel 180, the PB brake chamber 151 and the second port 153. When the pressures of the first port 141 and the second port 153 reach equilibrium, the supply piston 130 is reset under the force of the secondary spring 172, the supply piston 130 contacts the valve housing 110, the communication passage 180 is closed by the supply piston 130, and the PB system and the PB chamber of the brake cylinder are disconnected. After the driver releases the brake pedal, the ambient pressure keeps the high selector valve SH1 on the pressure demand side of the secondary service brake circuit, the air pressure in the PB control chamber 152 drops, the main spring 171 pushes the main piston 120 upward, so that the main piston 120 releases the supply piston 130, and the air in the PB chamber of the brake cylinder is discharged from the discharge passage 131, similar to switching from the release state to the parking state.

The other contents of the third embodiment are consistent with those of the second embodiment and will not be described in detail here.

Embodiment 4

In conjunction with Figure 4, a parking brake system is provided in this embodiment. The system is used for air braking of a vehicle with a trailer, including a type I parking relay valve 100A of embodiment one and a type II parking relay valve 100B of embodiment two. The type I parking relay valve 100A is arranged on the braking circuit of the trailer, and the type II parking relay valve 100B is arranged on the braking circuit of the vehicle. The braking circuit of the vehicle is the same as that in embodiment three and will not be repeated here.

In this embodiment, two solenoid valves MV3 and MV4 are provided on the brake circuit of the trailer. Both solenoid valves MV3 and MV4 are provided with two ports and two states. The two battery valves MV3 and MV4 are in a closed state under normal conditions. Only when the solenoid valve is activated, the two ports of a single solenoid valve are connected. P3 and P4 are connected to the type I parking relay valve 100A through the high selection valve SH3, so as to control the gas flow state of the type I parking relay valve 100A according to the pressure demand. When the maximum pressure of the main and auxiliary brake circuits is higher than 60PSI, the trailer brake circuit can be filled. The state switching of the type I parking relay valve 100A in the trailer brake circuit can refer to the description of switching the type II parking relay valve 100B to the release state and switching to the parking state in the third embodiment, which will not be repeated here.

The other contents of the fourth embodiment are the same as those of the third embodiment and will not be described in detail here.

In addition to the above preferred embodiments, the present invention has other implementation modes. Those skilled in the art can make various changes and modifications based on the present invention. As long as they do not depart from the spirit of the present invention, they should all fall within the scope defined in the claims of the present invention.

Claims

A parking relay valve, used for air brake of a vehicle, comprises a valve housing, a main piston and a supply piston, and is characterized in that:

The valve housing is provided with a parking chamber, a control chamber and a pop-up function chamber which are distributed in sequence;

The main piston includes a piston rod and a piston block arranged at one end of the piston rod, the piston rod is inserted into the control cavity and the ejection function cavity, the piston block is arranged in the control cavity, and a main spring acting on the piston block is arranged in the control cavity;

The parking chamber is provided with a first port connected to the PB system;

The control chamber is divided into a PB brake chamber and a PB control chamber by the piston block. The PB brake chamber is provided with a second port connected to the PB chamber of the brake cylinder, and the PB control chamber is provided with a third port connected to the parking control element.

The supply piston passes through the parking chamber and extends into the PB brake chamber. The supply piston is used to control the on-off between the parking chamber and the PB brake chamber and is provided with a discharge channel that can communicate with the PB brake chamber. The parking chamber is provided with a secondary spring that acts on the supply piston.

The pop-up function chamber is provided with a pop-up slider sleeved on the piston rod and a pop-up spring acting on the pop-up slider, the pop-up slider can drive the main piston to move synchronously, the pop-up function chamber is divided into an ambient pressure chamber and a pop-up control chamber by the pop-up slider, the ambient pressure chamber is provided with a fourth port connected to the external air, and the pop-up control chamber is provided with a fifth port connected to the service brake circuit;

When the pressure in the PB control chamber decreases, the main spring drives the piston block to move, so that the PB chamber of the brake cylinder is connected to the discharge channel of the supply piston, thus achieving braking;

When the pressure in the PB control chamber increases, the piston block drives the supply piston to move, so that the PB system is connected with the PB chamber of the brake cylinder to achieve release;

When the maximum pressure of the service brake circuit drops to a first preset value, the pop-up spring drives the main piston to move and release the supply piston through the pop-up slider, so that the PB chamber of the brake cylinder is connected to the discharge channel of the supply piston to achieve self-braking.
The parking relay valve according to claim 1 is characterized in that a portion of the piston rod located in the pop-up functional chamber is provided with a protrusion that can interfere with the pop-up slider.
The parking relay valve according to claim 1, characterized in that the first preset value is 40PSI.
The parking relay valve according to claim 1 is characterized in that:

The valve housing is provided with a mixing function chamber.

The piston rod passes through the mixing function chamber, and a proportional slider sleeved on the piston rod and a proportional spring acting on the proportional slider are arranged in the mixing function chamber, and the proportional slider can drive the main piston to move synchronously;

The hybrid function chamber is divided into a proportional control chamber and a main brake chamber by a proportional slider, the proportional control chamber is provided with a sixth port connected to the auxiliary service brake circuit, and the main brake chamber is provided with a seventh port connected to the main brake circuit;

When the maximum pressure of the main brake circuit drops to a second preset value, the proportional spring drives the main piston to move and release the supply piston through the proportional slider, and the PB chamber of the brake cylinder is depressurized through the discharge channel of the supply piston to balance the pressure with the PB system.
The parking relay valve according to claim 4, characterized in that the second preset value is 60PSI.
The parking relay valve according to claim 4 is characterized in that a portion of the piston rod located in the mixing function chamber is provided with a convex ring portion that can interfere with the proportional slider.
A parking brake system for air braking of a self-powered vehicle, characterized in that the parking brake system comprises a parking relay valve as claimed in any one of claims 4 to 6.
Parking brake system, air brake for a vehicle with a trailer, characterized in that

The parking brake system comprises the parking relay valve according to any one of claims 1 to 3 and the parking relay valve according to any one of claims 4 to 6,

The parking relay valve according to any one of claims 1 to 3 is arranged on the brake circuit of the trailer.

The parking relay valve described in any one of claims 4 to 6 is arranged on a brake circuit of a vehicle.