CN218750730U - Parking relay valve and parking braking system - Google Patents
Parking relay valve and parking braking system Download PDFInfo
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- CN218750730U CN218750730U CN202222669156.1U CN202222669156U CN218750730U CN 218750730 U CN218750730 U CN 218750730U CN 202222669156 U CN202222669156 U CN 202222669156U CN 218750730 U CN218750730 U CN 218750730U
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Abstract
The utility model discloses a parking relay valve and parking braking system, belong to vehicle braking equipment technical field, the parking relay valve includes the valve casing, the main piston and supply piston, the valve casing is equipped with the parking chamber, the control chamber with pop out the function chamber, the main piston includes piston rod and piston piece, the piston rod is worn to locate the control chamber and is popped out in the function chamber, the piston piece is located in the control chamber, be equipped with the main spring that acts on the piston piece in the control chamber, the parking chamber is equipped with the first port with PB headtotail, the control chamber is separated by the piston piece for PB braking minute chamber and PB control minute chamber, pop out and be equipped with the cover in the function chamber and locate popping out the slider on the piston rod and act on the spring that pops out the slider, it can drive the main piston synchronous motion to pop out the slider, pop out the function chamber and be popped out the slider and separate for ambient pressure minute chamber and pop out control minute chamber. The automatic braking is realized when the pressure of the braking circuit is reduced to a certain degree through the popping-up function cavity, so that the vehicle can stop moving in time, and the safety of the vehicle in running is improved.
Description
Technical Field
The utility model relates to a vehicle braking equipment technical field especially relates to parking relay valve, in addition, the utility model discloses still relate to the parking braking system who adopts this kind of parking relay valve.
Background
For the sake of safety, the brake of the existing large-scale vehicle has three states of a service state, a service brake state and a parking brake state, a brake circuit for realizing the brake is also generally provided with a main brake circuit and an auxiliary brake circuit, and when the main brake circuit is abnormal or fails, the auxiliary brake circuit compensates the main brake so that the vehicle can brake smoothly. The relay valve is an important component of a vehicle air brake system, and in an air brake system of a large vehicle, the relay valve plays a role in shortening the reaction time and the pressure establishment time. The structure of the existing relay valve is complex, when the pressure of a brake circuit is reduced due to the abnormity of a brake system of a vehicle, the structure for realizing self-braking through the relay valve is complex, and the self-braking function cannot be realized through quick response.
SUMMERY OF THE UTILITY MODEL
In order to solve the shortcoming and the not enough that exist among the above-mentioned prior art, the utility model provides a parking relay valve adds and has established and pop out the function chamber, and when service braking return circuit's maximum pressure was too little, the PB chamber of checking cylinder and the discharge passage intercommunication of supplying with the piston realize self-actuating brake's purpose, improve the safety of traveling of vehicle.
In order to achieve the above technical object, the present invention provides a parking relay valve for air braking of a vehicle, including a valve housing, a main piston, and a supply piston,
the valve shell is provided with a parking cavity, a control cavity and a pop-up function cavity which are distributed in sequence;
the main piston comprises a piston rod and a piston block arranged at one end of the piston rod, the piston rod is arranged in the control cavity and the ejection function cavity in a penetrating manner, 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 cavity is provided with a first port connected with a PB system;
the control cavity is divided into a PB brake sub-cavity and a PB control sub-cavity by the piston block, the PB brake sub-cavity is provided with a second port connected with the PB cavity of the brake cylinder, and the PB control sub-cavity is provided with a third port connected with the parking control part;
the supply piston penetrates through the parking cavity and extends into the PB brake sub-cavity, the supply piston is used for controlling the on-off between the parking cavity and the PB brake sub-cavity and is provided with a discharge passage which can be communicated with the PB brake sub-cavity, and an auxiliary spring acting on the supply piston is arranged in the parking cavity;
the ejection function cavity is internally 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 synchronously move, the ejection function cavity is divided into an environment pressure sub-cavity and an ejection control sub-cavity by the ejection sliding block, the environment pressure sub-cavity is provided with a fourth port communicated with external air, and the ejection control sub-cavity is provided with a fifth port connected with a service braking loop;
when the pressure of the PB control sub-cavity is reduced, the main spring drives the piston block to move, so that the PB cavity of the brake cylinder is communicated with a discharge passage of the supply piston, and braking is realized;
when the pressure of the PB control sub-cavity is increased, the piston block drives the supply piston to move, so that the PB system is communicated with the PB cavity of the brake cylinder, and release is realized;
when the maximum pressure of the service braking loop is lower than a first preset value, the pop-up spring drives the main piston to move through the pop-up slider to release the supply piston, so that the PB cavity of the brake cylinder is communicated with the discharge channel of the supply piston, and self-braking is realized.
Preferably, the part of the piston rod in the ejection function cavity is provided with a protruding part which can be in interference fit with the ejection slide block.
Preferably, the first preset value is 40PSI.
Preferably, the valve housing is provided with a mixing function chamber,
the piston rod penetrates through the mixing function cavity, a proportional sliding block sleeved on the piston rod and a proportional spring acting on the proportional sliding block are arranged in the mixing function cavity, and the proportional sliding block can drive the main piston to synchronously move;
the mixed function cavity is divided into a proportional control sub-cavity and a main brake sub-cavity by a proportional slider, the proportional control sub-cavity is provided with a sixth port connected with the auxiliary service brake loop, and the main brake sub-cavity is provided with a seventh port connected with the main brake loop;
when the maximum pressure of the main brake circuit is lower than a second preset value, the proportional spring drives the main piston to move through the proportional slider and releases the supply piston, and the PB cavity of the brake cylinder is depressurized to be balanced with the pressure of the PB system through the discharge channel of the supply piston.
Preferably, the second preset value is 60PSI.
Preferably, the part of the piston rod in the mixed function cavity is provided with a convex ring part which can be in interference fit with the proportional slide block.
The utility model also provides a parking braking system for from the air brake of the vehicle of taking power, parking braking system includes the parking relay valve of above-mentioned record.
The utility model also provides a parking braking system for take the air brake of the vehicle of trailer, parking braking system includes two kinds of parking relay valves of above-mentioned record, and on one of them parking relay valve located the braking return circuit of trailer, another kind of parking relay valve located the braking return circuit of vehicle on.
After the technical scheme is adopted, the utility model has the advantages of as follows:
1. the utility model provides a parking relay valve, valve casing have set up parking chamber, control chamber and have popped out the function chamber, and the ambient pressure who pops out the function chamber divides chamber and outside air intercommunication, pops out control and divides the chamber to be connected with service brake circuit. When the maximum pressure is reduced to a first preset value due to the fact that a service brake loop breaks down, the pop-up spring acts on the pop-up slider, the pop-up slider drives the main piston to release the supply piston, and therefore the PB cavity of the brake cylinder is communicated with the discharge channel of the supply piston, the pressure of the PB cavity of the brake cylinder is reduced, the brake performs self-braking, and the purpose of automatic parking is achieved. The automatic braking is realized when the pressure of the braking circuit is reduced to a certain degree through the popping-up function cavity, so that the vehicle can stop moving in time, and the safety of the vehicle during running is improved.
2. Furthermore, the valve casing sets up the mixed function chamber, when the main brake return circuit broke down and lead to the maximum pressure to be low to the second default, proportional spring acts on the proportion slider, make and pop out the slider and drive the main piston and remove, the main piston releases the supply piston, the PB chamber and the discharge channel intercommunication of supply piston of brake cylinder, the pressure in PB chamber reduces to the supply pressure balance with the PB system, make braking system can brake according to the pressure condition in vice braking return circuit, thereby make the pressure in vice braking return circuit satisfy the braking requirement.
Drawings
Fig. 1 is a schematic internal structure view of a type i parking relay valve according to an embodiment;
FIG. 2 is a schematic view of an internal structure of a type II parking relay valve according to a second embodiment;
FIG. 3 is a schematic view of a parking brake system according to a third embodiment;
fig. 4 is a schematic diagram of a parking brake system according to a fourth embodiment.
In the figure, the parking relay valve of type 100A-i, the parking relay valve of type 100B-ii, 110-valve housing, 120-master piston, 121-piston rod, 122-piston block, 123-projection, 124-collar, 130-supply piston, 131-exhaust 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-eject function chamber, 161-ambient pressure chamber, 162-eject control chamber, 163-eject slider, 164-fourth port, 165-fifth port, 171-master spring, 172-secondary spring, 173-eject spring, 174-proportional spring, 180-communication channel, 190-mixing function chamber, 191-proportional control chamber, 192-master brake chamber, 193-proportional slider, 194-sixth port, 195-seventh port.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments. It is to be understood that the following terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," "bottom," and the like, which refer to orientations or positional relationships, are based only on the orientations or positional relationships illustrated in the drawings and are used only for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the device/component so referred to must have a particular orientation or be constructed and operated in a particular orientation and therefore are not to be construed as limiting the present invention.
Example one
As shown in fig. 1, a parking relay valve 100A of a type i according to an embodiment of the present invention, which is used for air braking of a vehicle, 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 an ejection function chamber 160 which are distributed from bottom to top in sequence;
the main piston 120 comprises a piston rod 121 and a piston block 122 arranged at one end of the piston rod 121, the piston rod 121 is arranged in the control cavity 150 and the ejection function cavity 160 in a penetrating manner, the piston block 122 is arranged in the control cavity 150, and a main spring 171 acting on the piston block 122 is arranged in the control cavity 150;
the parking chamber 140 is provided with a first port 141 for connection to a PB system;
the control chamber 150 is divided by the piston block 122 into a PB brake sub-chamber 151 and a PB control sub-chamber 152, the PB brake sub-chamber 151 being provided with a second port 153 connected to the PB chamber of the brake cylinder, the PB control sub-chamber 152 being provided with a third port 154 connected to the parking control member;
the supply piston 130 penetrates through the parking cavity 140 and extends into the PB brake subchamber 151, the supply piston 130 is used for controlling the connection and disconnection between the parking cavity 140 and the PB brake subchamber 151 and is provided with a discharge passage 131 which can be communicated with the PB brake subchamber 151, and a secondary spring 172 acting on the supply piston 130 is arranged in the parking cavity 140;
the pop-up function cavity 160 is internally 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 synchronously move, the pop-up function cavity 160 is divided into an environment pressure sub-cavity 161 and a pop-up control sub-cavity 162 by the pop-up slider 163, the environment pressure sub-cavity 161 is provided with a fourth port 164 communicated with external air, and the pop-up control sub-cavity 162 is provided with a fifth port 165 connected with a service brake loop;
when the pressure of the PB control sub-chamber 152 is reduced, the main spring 171 drives the upper piston block 122 to move, so that the PB chamber of the brake cylinder is communicated with the discharge passage 131 of the supply piston 130, and braking is realized;
when the pressure of the PB control sub-cavity 152 is increased, the piston block 122 drives the supply piston 130 to move downwards, so that the PB system is communicated with the PB cavity of the brake cylinder, and release is realized;
when the maximum pressure of the service braking circuit is lower than a first preset value, the pop-up spring 173 drives the main piston 120 to move upwards through the pop-up slider 163 and releases the supply piston 130, so that the PB chamber of the brake cylinder is communicated with the discharge passage 131 of the supply piston 130, and self-braking is realized.
In order to make the eject slider 163 smoothly drive the main piston 120 to move upward to release the supply piston 130, the piston rod 121 is provided with a protrusion 123 in interference fit with the eject slider 163 at a position in the eject function chamber 160. In this embodiment, the ejecting slider 163 is provided with a hole for the upper end of the piston rod 121 to pass through, the top end of the piston rod 121 is provided with a circle of convex ring forming the protrusion 123, and the outer diameter of the convex ring is larger than the inner diameter of the hole for the piston rod 121 to pass through on the ejecting slider 163.
The type i parking relay valve 100A of this embodiment is mainly used for braking a trailer, the air pressure of a service brake circuit is consistent with the air pressure of a service brake circuit in a tractor, the air pressure of the service brake circuit includes the air pressure of a main service brake circuit and the air pressure of an auxiliary service brake circuit, and the first preset value is specifically 40PSI.
A communication passage 180 is provided between the parking chamber 140 and the PB brake subchamber 151 of the control chamber 150, and a part of the supply piston 130 is located in the communication passage 180. The feed piston 130 may move downward away from the valve housing 110 by the interference of the main piston 120, and at this time, the parking chamber 140 and the PB brake sub-chamber 151 may communicate with each other through the communication passage 180, so that the first port 141 and the second port 153 communicate with each other, and the feed pressure of the PB system may be output to the PB chamber of the brake cylinder through the first port 141, the parking chamber 140, the communication passage 180, the PB brake sub-chamber 151, and the second port 153. When the pressures of the first port 141 and the second port 153 reach equilibrium, the feed piston 130 is reset by the force of the secondary spring 172, the feed piston 130 collides with the valve housing 110, the communication passage 180 is closed by the feed piston 130, the PB system and the PB chamber of the brake cylinder are disconnected, and the switch from parking to release is realized.
When parking is needed, air in the PB control sub-chamber 152 is exhausted, air pressure in the PB control sub-chamber 152 is reduced, the main piston 120 moves upwards under the action of the elastic force of the main spring 171, the main piston 120 releases the supply piston 130, the PB brake sub-chamber 151 and the exhaust passage 131 of the supply piston 130 to be communicated, the PB chamber of the brake cylinder is communicated with the exhaust passage 131 through the first port 141 and the PB brake sub-chamber 151, air in the PB chamber of the brake cylinder can be exhausted through the first port 141, the PB brake sub-chamber 151 and the exhaust passage 131, and air pressure in the PB chamber of the brake cylinder is reduced. When the air pressure in PB brake subchamber 151 decreases to the point where master piston 120 falls back into contact with supply piston 130, the air pressure in the brake cylinder PB chamber reaches a minimum, at which point the brake grips the wheel and switches from released to parked.
When the air pressure of the service brake circuit is lower than a first preset value, which indicates that the service brake circuit has a fault, at this time, the air pressure in the pop-up control sub-chamber 162 is reduced, 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 upwards to release the supply piston 130, the PB sub-chamber 151 is communicated with the discharge passage 131 of the supply piston 130, the PB chamber of the brake cylinder can be communicated with the discharge passage 131 through the first port 141 and the PB sub-chamber 151, the air in the PB chamber of the brake cylinder can be discharged through the first port 141, the PB sub-chamber 151 and the discharge passage 131, and the air pressure in the PB chamber of the brake cylinder is reduced. When the air pressure in the PB brake subchamber 151 is reduced to the point that the main piston 120 falls back to contact with 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 performs self-braking, thereby achieving the purpose of automatic parking. The self-braking is realized when the pressure of the braking circuit is reduced to a certain degree through the popping-up function cavity 160, so that the vehicle can stop moving in time, and the safety of the vehicle in running is improved.
It is understood that the first preset value may also be slightly greater than 40PSI.
Example two
Referring to fig. 2, the present embodiment discloses a type ii parking relay valve 100B, and the type ii parking relay valve 100B of the present embodiment is additionally provided with a mixed function chamber 190 on the basis of the structure of the first embodiment, and the mixed 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, a proportional slider 193 sleeved on the piston rod 121 and a proportional spring 174 acting on the proportional slider 193 are disposed in the mixing function chamber 190, and the proportional slider 193 can drive the main piston 120 to move upward synchronously. The mixed function chamber 190 is divided into a proportional control subchamber 191 and a main brake subchamber 192 by a proportional slider 193, the proportional control subchamber 191 is provided with a sixth port 194 connected with the auxiliary service brake circuit, and the main brake subchamber 192 is provided with a seventh port 195 connected with the main brake circuit. When the maximum pressure of the main brake circuit is lowered to a second preset value, the proportional spring 174 drives the main piston 120 to move upward through the proportional slider 193 and releases the supply piston 130, and the PB chamber of the brake cylinder is depressurized through the discharge passage 131 of the supply piston 130 to be balanced with the supply pressure of the PB system.
The type ii parking relay valve 100B of this embodiment is mainly used for air braking of a self-powered vehicle, 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, and the second preset value is specifically 60PSI.
When the main brake circuit is in fault and the maximum pressure is lower than a second preset value, the pressure of the PB cavity of the brake cylinder is reduced to be balanced with the supply pressure of the PB system, so that the PB system can brake according to the pressure condition of the auxiliary brake circuit, and the pressure of the auxiliary brake circuit meets the braking requirement. Further, when the maximum pressure of the main brake circuit is lower than the second preset value, the air pressure in the main brake sub-chamber 192 decreases, the proportional spring 174 acts on the proportional slider 193 to move the proportional slider 193 upwards, the proportional slider 193 drives the main piston 120 to move upwards, the main piston 120 releases the supply piston 130, the PB brake sub-chamber 151 and the discharge channel 131 of the supply piston 130 to be communicated, the PB chamber of the brake cylinder is communicated with the discharge channel 131 through the first port 141 and the PB brake sub-chamber 151, the air in the PB chamber of the brake cylinder can be discharged through the first port 141, the PB brake sub-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 subchamber 151 is reduced to the point that the main piston 120 falls back to contact with the supply piston 130, the control pressure of the PB chamber of the brake cylinder and the supply pressure of the PB system are balanced, so that the air pressure of the PB system can meet the braking requirement of the brake cylinder, and the brake can be smoothly braked when the brake is needed.
In order to make the proportional slider 193 smoothly move the main piston 120 upward to release the supply piston 130, the piston rod 121 is provided with a convex ring portion 124 in interference fit with the proportional slider 193 at a position in the mixing function chamber 190. In this embodiment, the proportional slider 193 is provided with a hole through which the piston rod 121 passes, and the outer diameter of the convex ring portion 124 is larger than the inner diameter of the hole through which the piston rod 121 passes on the proportional slider 193.
The other structures of the second embodiment are the same as those of the first embodiment, and are not described herein again.
It is understood that the second preset value may also be slightly greater than 60PSI.
EXAMPLE III
In conjunction with fig. 3, the present embodiment provides a parking brake system for air braking of an autonomous vehicle, the parking brake system including a type ii parking relay valve 100B of the second embodiment.
In this embodiment, the parking brake system includes two solenoid valves MV1, MV2, and two solenoid valves MV1, MV2 all are equipped with two ports and two kinds of states, and two battery valves MV1, MV2 all are in the closed condition under the normality, and only when the solenoid valve was activated, two ports of solenoid valve just communicate. In fig. 3, P1 represents the supply pressure of the PB system, P2 represents the pressure demand of the secondary service brake, P3 represents the pressure of the primary service brake circuit, and P4 represents the pressure of the secondary service brake circuit. The two solenoid valves and the II-type parking relay valves 100B and P2 are connected through the high selection valve SH1, and the P3 and the P4 are connected with the II-type parking relay valve 100B through the high selection valve SH2, so that the air path circulation state of the II-type parking relay valve 100B can be controlled conveniently according to pressure requirements.
When the vehicle is switched from the parking state to the release state, the battery valve MV1 is activated, the supply pressure switches the high selection valve SH1 to the control side, so that the PB control sub-chamber 152 in the type ii parking relay valve 100B is filled, the air pressure in the PB control sub-chamber 152 is increased, the main piston 120 drives the supply piston 130 to move downward away from the valve housing 110, 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 passage 180, the PB brake sub-chamber 151, and the second port 153. When the pressures of the first port 141 and the second port 153 reach equilibrium, the feed piston 130 is returned by the biasing force of the sub-spring 172, the feed piston 130 abuts against the valve housing 110, the communication passage 180 is closed by the feed piston 130, the PB system and the PB chamber of the brake cylinder are disconnected, and the switch from parking to release is achieved.
When the vehicle is switched from the release state to the parking state, P2 is 0, the control volumes of the two electromagnetic valves MV1 and MV2 are connected, the electromagnetic valve MV2 is activated, air in the PB control sub-chamber 152 is released, air pressure in the PB control sub-chamber 152 is reduced, the master piston 120 moves upwards under the elastic force of the master spring 171, the master piston 120 releases the supply piston 130, the PB brake sub-chamber 151 is communicated with the discharge passage 131 of the supply piston 130, air in the PB chamber of the brake cylinder can be discharged through the first port 141, the PB brake sub-chamber 151 and the discharge passage 131, and air pressure in the PB chamber of the brake cylinder is reduced. When the air pressure in the PB brake subchamber 151 decreases until the master piston 120 falls back into contact with the supply piston 130, the air pressure in the PB chamber of the brake cylinder reaches a minimum, at which time the brake grips the wheel and a switch from released to parked is made.
Since the parking brake system and the service brake system realize parking and release through the same brake, when the parking brake system and the service brake system act on the brake at the same time, the pressure of the PB cavity of the brake is overlarge, which can cause the cylinder explosion of the brake. In this regard, the type ii parking relay valve 100B of the present embodiment also has a repeat-and-turn function. Specifically, when the repeated closing function needs to be activated, the control amount among the solenoid valve MV1, the solenoid valve MV2 and the high selection valve SH1 is the ambient pressure, after the driver depresses the service brake pedal, the pressure switches the high selection valve SH1 to the pressure demand side of the auxiliary service brake circuit, the air pressure in the PB control sub-chamber 152 is increased, so that the main piston 120 drives the supply piston 130 to move downward and leave the valve housing 110, and the supply pressure of the PB system can be absorbed by the PB chamber of the brake cylinder through the first port 141, the parking chamber 140, the communication passage 180, the PB brake sub-chamber 151 and the second port 153. When the pressures of the first and second ports 141 and 153 reach an equilibrium, the feed piston 130 is returned by the force of the secondary spring 172, the feed piston 130 interferes with the valve housing 110, the communication passage 180 is closed by the feed piston 130, and the PB system and the PB chamber of the brake cylinder are disconnected. When the driver releases the brake pedal, the ambient pressure holds the high selector SH1 on the side of the auxiliary service brake circuit pressure demand, the PB control branch chamber 152 decreases in air pressure, the master spring 171 pushes up the master piston 120, the master piston 120 releases the supply piston 130, and the air in the brake cylinder PB chamber is exhausted from the exhaust passage 131, similarly switching from the release state to the parking state.
The other contents of the third embodiment are the same as those of the second embodiment, and are not described herein.
Example four
With reference to fig. 4, the present embodiment provides a parking brake system for air braking of a vehicle with a trailer, including a first type i parking relay valve 100A according to a first embodiment and a second type ii parking relay valve 100B according to a second embodiment, where the first type i parking relay valve 100A is disposed on a brake circuit of the trailer, and the second type ii parking relay valve 100B is disposed on a brake circuit of the vehicle, and the brake circuit of the vehicle is the same as that in the third embodiment, and will not be described again.
In this embodiment, be equipped with two solenoid valves MV3, MV4 on the braking circuit of trailer, two solenoid valves MV3, MV4 all are equipped with two ports and two kinds of states, two battery valves MV3, MV4 are in the closed condition under the normality, only when the solenoid valve is activated, two ports of single solenoid valve just communicate, P3 and P4 are connected with i type parking relay valve 100A through high-speed selector valve SH3, be convenient for according to the gas circuit circulation state of pressure demand control i type parking relay valve 100A. The trailer brake circuit may be filled when the maximum pressure of the primary and secondary brake circuits is above 60PSI. For the switching of the state of the type i parking relay valve 100A in the trailer brake circuit, reference may be made to the description of the switching of the type ii parking relay valve 100B to the release state and to the parking state in the third embodiment, and details thereof will not be described herein.
The other contents of the fourth embodiment are the same as those of the third embodiment, and are not described herein.
In addition to the above preferred embodiments, the present invention has other embodiments, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which shall fall within the scope of the present invention defined in the appended claims.
Claims (8)
1. Parking relay valve, for air braking of a vehicle, comprising a valve housing, a main piston and a supply piston, characterized in that,
the valve shell is provided with a parking cavity, a control cavity and an ejection function cavity which are sequentially distributed;
the main piston comprises a piston rod and a piston block arranged at one end of the piston rod, the piston rod is arranged in the control cavity and the ejection function cavity in a penetrating manner, 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 cavity is provided with a first port connected with a PB system;
the control cavity is divided into a PB brake sub-cavity and a PB control sub-cavity by the piston block, the PB brake sub-cavity is provided with a second port connected with the PB cavity of the brake cylinder, and the PB control sub-cavity is provided with a third port connected with the parking control part;
the supply piston penetrates through the parking cavity and extends into the PB brake sub-cavity, the supply piston is used for controlling the on-off between the parking cavity and the PB brake sub-cavity and is provided with a discharge channel which can be communicated with the PB brake sub-cavity, and an auxiliary spring acting on the supply piston is arranged in the parking cavity;
the ejection function cavity is internally 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 synchronously move, the ejection function cavity is divided into an environment pressure sub-cavity and an ejection control sub-cavity by the ejection sliding block, the environment pressure sub-cavity is provided with a fourth port communicated with external air, and the ejection control sub-cavity is provided with a fifth port connected with a service braking loop;
when the pressure of the PB control sub-cavity is reduced, the main spring drives the piston block to move, so that the PB cavity of the brake cylinder is communicated with a discharge passage of the supply piston, and braking is realized;
when the pressure of the PB control sub-cavity is increased, the piston block drives the supply piston to move, so that the PB system is communicated with the PB cavity of the brake cylinder to realize release;
when the maximum pressure of the service braking loop is lower than a first preset value, the pop-up spring drives the main piston to move through the pop-up slider to release the supply piston, so that the PB cavity of the brake cylinder is communicated with the discharge channel of the supply piston, and self-braking is realized.
2. The parking relay valve as recited in claim 1 wherein the portion of the piston rod located in the ejection function chamber is provided with a projection that is interference fit with the ejection slider.
3. The park relay valve of claim 1, wherein the first preset value is 40PSI.
4. The park relay valve of claim 1,
the valve housing is provided with a mixing function chamber,
the piston rod penetrates through the mixing function cavity, a proportional sliding block sleeved on the piston rod and a proportional spring acting on the proportional sliding block are arranged in the mixing function cavity, and the proportional sliding block can drive the main piston to synchronously move;
the mixed function cavity is divided into a proportional control sub-cavity and a main brake sub-cavity by a proportional slider, the proportional control sub-cavity is provided with a sixth port connected with the auxiliary service brake loop, and the main brake sub-cavity is provided with a seventh port connected with the main brake loop;
when the maximum pressure of the main brake circuit is lower than a second preset value, the proportional spring drives the main piston to move through the proportional slider and release the supply piston, and the PB cavity of the brake cylinder is reduced in pressure through the discharge channel of the supply piston to be balanced with the pressure of the PB system.
5. The park relay valve of claim 4, wherein the second preset value is 60PSI.
6. The park relay valve according to claim 4, wherein a portion of said piston rod located in the hybrid function chamber is provided with a collar portion adapted to interference fit with the proportional slide.
7. Parking brake system for air braking of a self-powered vehicle, characterized in that it comprises a parking relay valve according to any of claims 4 to 6.
8. Parking brake system for air braking of a vehicle with trailer, characterized in that,
the parking brake system comprising the parking relay valve of any one of claims 1 to 3 and the parking relay valve of any one of claims 4 to 6,
a parking relay valve as claimed in any one of claims 1 to 3, provided on the brake circuit of a trailer,
the parking relay valve according to any one of claims 4 to 6, provided in a brake circuit of a vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222669156.1U CN218750730U (en) | 2022-10-10 | 2022-10-10 | Parking relay valve and parking braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222669156.1U CN218750730U (en) | 2022-10-10 | 2022-10-10 | Parking relay valve and parking braking system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218750730U true CN218750730U (en) | 2023-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222669156.1U Active CN218750730U (en) | 2022-10-10 | 2022-10-10 | Parking relay valve and parking braking system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024077699A1 (en) * | 2022-10-10 | 2024-04-18 | 浙江万安科技股份有限公司 | Parking relay valve and parking braking system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024077699A1 (en) * | 2022-10-10 | 2024-04-18 | 浙江万安科技股份有限公司 | Parking relay valve and parking braking system |
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