CN217170656U - Relay valve assembly and vehicle - Google Patents

Abstract

The utility model discloses a relay valve subassembly and vehicle, relay valve subassembly includes: the valve shell is provided with an air storage device interface, a master cylinder interface, a service brake chamber interface, a hand brake valve interface, a parking brake chamber interface, a first exhaust port, a second exhaust port, a relay valve cavity and a differential valve cavity, the relay valve cavity is communicated with the air storage device interface, the master cylinder interface, the service brake chamber interface and the first exhaust port, and the differential valve cavity is communicated with the air storage device interface, the hand brake valve interface, the parking brake chamber interface and the second exhaust port; the relay valve core is arranged in the relay valve cavity and selectively performs service braking and relieves the service braking; and the differential valve spool is arranged in the differential valve cavity and selectively performs parking braking and driving. The valve core of the relay valve and the valve core of the differential valve are integrated in the valve shell, so that the manufacturing cost can be reduced, the safety of vehicle running and braking is improved, the occupied space is reduced, and the design space of a vehicle is improved.

Description

Relay valve assembly and vehicle

Technical Field

The utility model belongs to the technical field of the vehicle technique and specifically relates to a relay valve subassembly and vehicle are related to.

Background

At present, in order to prevent the simultaneous operation of a driving brake system and a parking brake system of a domestic medium-large air brake passenger car, the combined spring brake cylinder and the force in a brake chamber (spring brake chamber) are overlapped, so that the overload of a mechanical transmission element is caused, and the functions are realized by adopting the following two modes: the first mode of adopting two-way valve + quick release valve + relay valve, the second mode adopts differential valve + relay valve cooperation to use, wherein, because first structure is not the same in the aspect of stability in use and security as second structure, therefore has basically eliminated the use in the higher public bus of security requirement.

In the related technology, the differential valve and the relay valve are of a split structure, and 2 three-way joints, 2 air pipes and 2 straight-through joints are required to be connected in the using process. However, the number of intermediate excessive connecting pipelines is increased, which causes the problems of poor safety of the vehicle braking system, messy pipelines, short space, high cost and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a relay valve subassembly, this relay valve subassembly can form the integral type structure, reduces manufacturing cost, improves brake piping's reason in the same direction as effect, improves easy maintenance nature, also can improve the security of vehicle driving and braking, reduces occupation space, improves vehicle chassis's design space.

The utility model discloses a vehicle is further proposed.

According to the utility model discloses a relay valve subassembly, include: the valve shell is provided with an air storage device interface, a master cylinder interface, a service brake chamber interface, a hand brake valve interface, a parking brake chamber interface, a first exhaust port, a second exhaust port, a relay valve cavity and a differential valve cavity, the relay valve cavity is respectively communicated with the air storage device interface, the master cylinder interface, the service brake chamber interface and the first exhaust port, and the differential valve cavity is respectively communicated with the air storage device interface, the hand brake valve interface, the parking brake chamber interface and the second exhaust port; the relay valve core is arranged in the relay valve cavity to selectively perform service braking and release the service braking; and the differential valve spool is arranged in the differential valve cavity so as to selectively perform parking braking and driving.

According to the utility model discloses a relay valve subassembly, with relay valve case and differential valve case integration in the valve casing, can make relay valve subassembly form the integral type structure, reduce pneumatic pipeline, connect quantity, the quantity and the valve body processing number of gas leakage point of the braking system of vehicle, reduce manufacturing cost, improve the reason in the same direction as effect of brake piping, improve easy maintenance nature, also can improve the security of vehicle driving and braking, and reduce valve body quantity, can reduce occupation space, improve vehicle chassis's design space, in addition, the braking system's that also can make the vehicle outward appearance structure is whole more and succinct like this.

In some examples of the present invention, the master cylinder interface and the hand brake valve interface are disposed at the top of the valve housing and open in opposite directions.

In some examples of the present invention, the air reservoir interface the service brake chamber interface with the parking brake chamber interface set up in the bottom of valve casing, the opening direction of air reservoir interface with the opening direction of service brake chamber interface is perpendicular, and with the opening direction of parking brake chamber interface is perpendicular.

In some examples of the present invention, the opening direction of the service brake chamber interface is opposite to the opening direction of the parking brake chamber interface, and the opening direction of the air storage device interface is perpendicular to the opening direction of the master cylinder interface and perpendicular to the opening direction of the hand brake valve interface.

In some examples of the invention, the valve housing comprises: the bottom cover set up in the bottom of the main casing body and with the main casing body prescribes a limit to jointly the relay valve cavity with the differential valve cavity, the master cylinder interface with the hand brake valve interface set up in the top of the main casing body, the gas storage device interface the service brake room interface the parking brake room interface first exhaust port with the second exhaust port set up in on the bottom cover.

In some examples of the present invention, a partition is disposed in the main casing, and two side cavities of the partition are the relay valve cavity and the differential valve cavity, respectively.

In some examples of the present invention, the relay valve spool includes: first piston, first push rod, first exhaust valve and first admission valve, the top of first piston with the master cylinder interface is corresponding and the bottom with service brake chamber interface is corresponding, first push rod set up in the bottom of first piston, first exhaust valve with first admission valve set up in first push rod, first admission valve selectively communicate the gas storage device interface with the bottom cavity of first piston, first exhaust valve selectively communicates the bottom cavity of first piston with first exhaust port.

In some examples of the present invention, the differential valve spool comprises: second piston, third piston, second push rod, second discharge valve and second admission valve, the top of second piston with the hand brake valve interface is corresponding, the third piston set up in the bottom of second piston, the bottom of third piston with parking brake chamber interface is corresponding, the second push rod set up in the bottom of third piston, the second discharge valve with the second admission valve set up in the second push rod, the second admission valve communicates selectively the gas storage device interface with the bottom cavity of third piston, the second discharge valve communicates selectively the bottom cavity of third piston with the second gas vent.

In some examples of the invention, the bottom of the second piston is provided with a groove, the third piston is provided with a protrusion, and the protrusion fits in the groove.

According to the utility model discloses a vehicle, include: the relay valve assembly described above.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of a relay valve assembly according to an embodiment of the present invention.

Reference numerals:

1. a relay valve assembly;

10. a valve housing; 11. a gas storage device interface; 12. a master cylinder interface; 13. a service brake chamber interface; 14. a hand brake valve interface; 15. a parking brake chamber interface; 16. a first exhaust port; 17. a second exhaust port; 18. a relay valve cavity; 19. a differential valve cavity; 20. a relay valve spool; 21. a first piston; 22. a first push rod; 23. a first exhaust valve; 24. a first intake valve; 30. a differential valve spool; 31. a second piston; 32. a third piston; 33. a second push rod; 34. a second exhaust valve; 35. a second intake valve; 36. a groove; 37. a protrusion; 40. a main housing; 41. a bottom cover; 42. a separator.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

A relay valve assembly 1 according to an embodiment of the present invention is described below with reference to fig. 1.

As shown in fig. 1, a relay valve assembly 1 according to an embodiment of the present invention includes: valve housing 10, relay valve spool 20, and differential valve spool 30. The valve housing 10 is a housing of the relay valve assembly 1 and may be configured as an overall shape structure of the relay valve assembly 1, of course, the valve housing 10 may perform an installation and sealing function, other components may be installed on the valve housing 10, and the valve housing 10 may also prevent the leakage of the airflow passing through the relay valve assembly 1, thereby causing the failure of the relay valve assembly 1. The relay valve spool 20 and the differential valve spool 30 may move so that the flow of the air flow may be controlled.

As shown in fig. 1, the valve housing 10 is provided with an air storage device interface 11, a master cylinder interface 12, a service brake chamber interface 13, a hand brake valve interface 14, a parking brake chamber interface 15, a first exhaust port 16, a second exhaust port 17, a relay valve cavity 18 and a differential valve cavity 19, wherein the relay valve cavity 18 is respectively communicated with the air storage device interface 11, the master cylinder interface 12, the service brake chamber interface 13 and the first exhaust port 16, and the differential valve cavity 19 is respectively communicated with the air storage device interface 11, the hand brake valve interface 14, the parking brake chamber interface 15 and the second exhaust port 17.

The air storage device interface 11 is communicated with the air storage cylinder, when the vehicle needs service braking or parking braking, air stored in the air storage cylinder can enter the valve shell 10 through the air storage device interface 11, the braking effect of the vehicle is achieved, the master pump interface 12 is communicated with the braking master cylinder, the hand brake valve interface 14 is communicated with the hand brake valve, the service braking chamber interface 13 is communicated with the service braking chamber, and the parking braking chamber interface 15 is communicated with the parking braking chamber.

The relay valve cavity 18 is respectively communicated with the air storage device interface 11, the master cylinder interface 12, the service brake chamber interface 13 and the first exhaust port 16, when the vehicle needs to be braked, the brake master cylinder is operated to be opened, gas enters the valve shell 10 from the master cylinder interface 12, so that the gas entering from the gas storage device interface 11 can enter the relay valve cavity 18, and then enters into the service braking chamber through the service braking chamber interface 13 to realize the service braking of the vehicle, when the vehicle needs to release the service brake, the brake master cylinder is operated to close, the gas entering the valve housing 10 through the master cylinder interface 12 is exhausted from the master cylinder interface 12, this allows air in the service brake chamber to flow back into the relay valve chamber 18 through the service brake chamber interface 13, and gas may continue to the first exhaust port 16 to be exhausted from the first exhaust port 16 so that service braking may be released.

The differential valve cavity 19 is respectively communicated with the air storage device interface 11, the hand brake valve interface 14, the parking brake chamber interface 15 and the second exhaust port 17, when the vehicle needs to drive, the hand brake valve is operated to open, and the air enters the valve shell 10 from the hand brake valve interface 14, so that the air entering from the air storage device interface 11 can enter the differential valve cavity 19, and then enter the parking brake chamber through the interface 15 of the parking brake chamber, realize the running of the vehicle, when the vehicle needs parking brake, the hand brake valve is operated to close, the air entering the valve housing 10 through the hand brake valve interface 14 is discharged from the hand brake valve interface 14, this allows the gas in the parking brake chamber to flow back again into the differential valve chamber 19 via the parking brake chamber connection 15, and the gas may continue to be introduced to the second exhaust port 17 and discharged from the second exhaust port 17, so that the parking brake of the vehicle may be implemented.

As shown in fig. 1, a relay valve spool 20 is disposed within the relay valve chamber 18, and the relay valve spool 20 may selectively apply and release service braking. The relay valve core 20 is arranged in the relay valve cavity 18, so that the arrangement is convenient, the relay valve core 20 can be matched with the valve shell 10, and air flow can be controlled to flow in the relay valve cavity 18 differently through the movement of the relay valve core 20 in the valve shell 10, so that service braking can be selectively carried out and service braking can be released.

As shown in FIG. 1, a differential valve spool 30 is disposed within differential valve cavity 19, and differential valve spool 30 may selectively provide for parking braking and service. Also, differential valve spool 30 is disposed within differential valve cavity 19 for ease of installation, and differential valve spool 30 may be mated with valve housing 10 to control the flow of air differently within differential valve cavity 19 by movement of differential valve spool 30 within valve housing 10 to selectively provide parking braking and service.

From this, integrate relay valve case 20 and differential valve case 30 in valve casing 10, can make relay valve subassembly 1 form the integral type structure, reduce the pneumatic pipeline, connect quantity, the quantity and the valve body number of processing of the gas leakage point of the braking system of vehicle, reduce manufacturing cost, improve the reason effect in order of brake pipeline, improve easy maintenance nature, also can improve the security of vehicle driving and braking, and reduce the valve body quantity, can reduce occupation space, improve the design space on vehicle chassis, in addition, the outward appearance structure that also can make the braking system of vehicle more wholly and succinct like this.

As shown in fig. 1, the master cylinder port 12 and the hand brake valve port 14 are disposed on the top of the valve housing 10, and the master cylinder port 12 and the hand brake valve port 14 are opened in opposite directions. The arrangement of the master cylinder interface 12 and the hand brake valve interface 14 on the top of the valve housing 10 is convenient, and the master cylinder interface 12 and the hand brake valve interface 14 are prevented from interfering with the installation position of the valve housing 10. The opening directions of the master cylinder interface 12 and the hand brake valve interface 14 are opposite, so that the connection of pipelines and joints at the master cylinder interface 12 and the hand brake valve interface 14 is facilitated, and the interference generated in the installation between the master cylinder interface 12 and the hand brake valve interface 14 is avoided.

Further, as shown in fig. 1, an air reservoir port 11, a service brake chamber port 13, and a parking brake chamber port 15 are provided at the bottom of the valve housing 10, and an opening direction of the air reservoir port 11 is perpendicular to an opening direction of the service brake chamber port 13 and to an opening direction of the parking brake chamber port 15. The air storage device interface 11, the service braking chamber interface 13 and the parking braking chamber interface 15 are arranged at the bottom of the valve casing 10, so that the arrangement is convenient, and the air storage device interface 11, the service braking chamber interface 13 and the parking braking chamber interface 15 are prevented from interfering with the installation positions of the master cylinder interface 12, the hand brake valve interface 14 and the valve casing 10. The opening direction of the air storage device interface 11 is perpendicular to the opening direction of the service brake chamber interface 13 and the opening direction of the parking brake chamber interface 15, so that the position of the air storage device interface 11 can be separated from the positions of the service brake chamber interface 13 and the parking brake chamber interface 15, and the air storage device interface 11, the service brake chamber interface 13 and the parking brake chamber interface 15 can be conveniently installed and connected.

Further, as shown in fig. 1, the opening direction of the service brake chamber interface 13 is opposite to the opening direction of the parking brake chamber interface 15, and the opening direction of the air storage device interface 11 is perpendicular to the opening direction of the master cylinder interface 12 and the opening direction of the hand brake valve interface 14. The opening direction of the service brake chamber interface 13 is opposite to the opening direction of the parking brake chamber interface 15, so that the service brake chamber interface 13 and the parking brake chamber interface 15 are convenient to connect a pipeline and a joint, and the interference generated in the installation between the service brake chamber interface 13 and the parking brake chamber interface 15 is avoided. The opening direction of the air storage device interface 11 is perpendicular to the opening direction of the master cylinder interface 12 and the opening direction of the hand brake valve interface 14, so that the position of the air storage device interface 11 can be separated from the positions of the master cylinder interface 12 and the hand brake valve interface 14, and the air storage device interface 11, the master cylinder interface 12 and the hand brake valve interface 14 can be conveniently installed and connected.

Specifically, as shown in fig. 1, the valve housing 10 includes: a main housing 40 and a bottom cover 41, wherein the bottom cover 41 is disposed at the bottom of the main housing 40, the bottom cover 41 and the main housing 40 together define a relay valve cavity 18 and a differential valve cavity 19, the master cylinder port 12 and the hand brake valve port 14 are disposed at the top of the main housing 40, and the air reservoir port 11, the service brake chamber port 13, the parking brake chamber port 15, the first exhaust port 16 and the second exhaust port 17 are disposed on the bottom cover 41. Since the main housing 40 needs to be installed in a vehicle, the master cylinder interface 12 and the hand brake valve interface 14 are disposed at the top of the main housing 40, and the air storage device interface 11, the service brake chamber interface 13, the parking brake chamber interface 15, the first exhaust port 16 and the second exhaust port 17 are disposed on the bottom cover 41, such an arrangement is more reasonable, and installation and connection at each interface are facilitated.

According to an alternative embodiment of the present invention, as shown in fig. 1, a partition plate 42 is disposed in the main housing 40, and two side cavities of the partition plate 42 are the relay valve cavity 18 and the differential valve cavity 19, respectively. A partition plate 42 is arranged in the main shell 40, the relay valve cavity 18 and the differential valve cavity 19 can be separated by the partition plate 42, so that the relay valve cavity 18 and the differential valve cavity 19 have certain independence, service braking and parking braking can be controlled in a separated mode, when one brake is damaged, the other brake is still effective, traffic accidents caused by damage of the brakes can be prevented, and a braking system of a vehicle is safer and more reliable.

Alternatively, as shown in fig. 1, the relay valve spool 20 includes: the first piston 21, the first push rod 22, the first exhaust valve 23 and the first intake valve 24, the top of the first piston 21 corresponds to the master cylinder interface 12, the bottom of the first piston 21 corresponds to the service brake chamber interface 13, the first push rod 22 is disposed at the bottom of the first piston 21, the first exhaust valve 23 and the first intake valve 24 are disposed at the first push rod 22, the first intake valve 24 selectively communicates with the air storage device interface 11 and the bottom cavity of the first piston 21, and the first exhaust valve 23 selectively communicates with the bottom cavity of the first piston 21 and the first exhaust port 16.

The top of first piston 21 is corresponding with master cylinder interface 12, when the vehicle needs service braking, after gas gets into valve casing 10 from master cylinder interface 12, gas can push first piston 21 downwards, first push rod 22 sets up in the bottom of first piston 21, after first piston 21 and first push rod 22 contact, first piston 21 can drive first push rod 22 downstream, and first exhaust valve 23 and first admission valve 24 set up in first push rod 22, at this moment, first exhaust valve 23 closes, first admission valve 24 opens, gas that enters into valve casing 10 from gas storage device interface 11 can enter into service braking room interface 13 from first admission valve 24, and then enters into service braking room, realize service braking of vehicle. When the vehicle needs to release the service brake, the gas is exhausted from the master cylinder interface 12, so that the pressure on the first piston 21 is released, the first piston 21 moves upwards, and thus the first push rod 22 also moves upwards, after a certain time, the first piston 21 is separated from the first push rod 22, at this time, the first exhaust valve 23 is opened, the first intake valve 24 is closed, and the gas in the service brake chamber enters the relay valve cavity 18, then passes through the first exhaust valve 23 to the first exhaust port 16 and is exhausted from the first exhaust port 16, so that the service brake can be released. Therefore, the control of the relay valve core 20 is simple and convenient, and the arrangement of the first piston 21, the first push rod 22, the first exhaust valve 23 and the first intake valve 24 is reasonable, simple in structure and more stable and reliable in control.

As shown in fig. 1, the differential valve spool 30 includes: the brake system comprises a second piston 31, a third piston 32, a second push rod 33, a second exhaust valve 34 and a second intake valve 35, wherein the top of the second piston 31 corresponds to the hand brake valve interface 14, the third piston 32 is arranged at the bottom of the second piston 31, the bottom of the third piston 32 corresponds to the parking brake chamber interface 15, the second push rod 33 is arranged at the bottom of the third piston 32, the second exhaust valve 34 and the second intake valve 35 are arranged at the second push rod 33, the second intake valve 35 selectively communicates with the air storage device interface 11 and the bottom cavity of the third piston 32, and the second exhaust valve 34 selectively communicates with the bottom cavity of the third piston 32 and the second exhaust port 17.

The top of the second piston 31 corresponds to the hand brake valve interface 14, when the vehicle needs to travel, after the gas enters the valve housing 10 from the hand brake valve interface 14, the gas will press the second piston 31 downward, the third piston 32 is disposed at the bottom of the second piston 31, so that the second piston 31 will drive the third piston 32 to move downward, the second push rod 33 is disposed at the bottom of the third piston 32, after the third piston 32 contacts with the second push rod 33, the third piston 32 will drive the second push rod 33 to move downward, and the second exhaust valve 34 and the second intake valve 35 are disposed at the second push rod 33, at this time, the second exhaust valve 34 is closed, the second intake valve 35 is opened, and the gas entering the valve housing 10 from the air reservoir interface 11 can enter the parking brake chamber interface 15 from the second intake valve 35, and then enter the parking brake chamber, so as to implement the travel of the vehicle. When the vehicle needs parking braking, air is exhausted from the hand brake valve interface 14, so that the pressure on the second piston 31 and the third piston 32 is relieved, the second piston 31 and the third piston 32 move upwards, and therefore the second push rod 33 also moves upwards, after a certain time, the third piston 32 is separated from the second push rod 33, at the moment, the second exhaust valve 34 is opened, the second intake valve 35 is closed, air in the parking braking chamber enters the differential valve cavity 19, and then is communicated to the second exhaust port 17 through the second exhaust valve 34 and exhausted from the second exhaust port 17, and the parking braking of the vehicle is realized. Therefore, the control of the differential valve core 30 is simple and convenient, and the arrangement of the second piston 31, the third piston 32, the second push rod 33, the second exhaust valve 34 and the second intake valve 35 is reasonable, the structure is simple, and the operation is more stable and reliable.

Specifically, as shown in fig. 1, in a driving state, the hand brake valve continuously supplies air into the valve housing 10 through the hand brake valve port 14, the second piston 31 and the third piston 32 are pressed to move downward, the second exhaust valve 34 is closed, the second push rod 33 is pushed to move downward, the second intake valve 35 is opened, compressed air from the air reservoir through the air reservoir port 11 is output through the parking brake chamber port 15, the parking brake chamber connected to the parking brake chamber port 15 is supplied with compressed air, the parking brake chamber is also a spring brake chamber, and the parking brake is released.

When the brake master cylinder is operated to be opened, compressed air enters the valve shell 10 through the master cylinder interface 12 when the brake pedal is stepped down in a service braking state, the first piston 21 and the third piston 32 are simultaneously pressed down, the first piston 21 moves downwards to close the first exhaust valve 23, the first intake valve 24 is opened, the compressed air of the air storage cylinder enters the valve shell 10 and is output through the service braking chamber interface 13, and the service braking chamber connected with the service braking chamber interface 13 is also an axle braking chamber, so that the service braking purpose is achieved. The third piston 32 has little influence on service braking by the pressure reaching the relay valve cavity 18 due to the reaction force of the differential valve cavity 19, and compressed air continues to flow to a spring energy storage cavity of the spring brake air chamber, so that the service braking and parking of the axle brake chamber are prevented from working simultaneously, and the braking force is prevented from being superposed.

When the service brake is released, the brake pedal is released, the brake master cylinder is operated to be closed, gas is exhausted through the master cylinder interface 12, the master cylinder interface 12 is communicated with the atmosphere, compressed air in the axle brake chamber enters the relay valve cavity 18 through the service brake chamber interface 13, the first piston 21 is pressed upwards, the first exhaust valve 23 is opened, the compressed air is exhausted through the first exhaust port 16, the service brake is released, and the parking brake is still in an open state and is not influenced because the hand brake valve interface 14 is still pressed by the compressed air from the hand control valve.

In the parking brake state, the manual valve is closed, compressed air is exhausted through the manual brake valve interface 14, the manual brake valve interface 14 is communicated with the atmosphere through the manual valve, the compressed air in the spring brake chamber enters the differential valve cavity 19 through the parking brake chamber interface 15, the second piston 31 and the third piston 32 are pressed upwards, the second exhaust valve 34 is opened, the compressed air is communicated to the second exhaust port 17 through the second exhaust valve 34 and is exhausted into the atmosphere from the second exhaust port 17, and the parking brake is formed in the spring brake chamber under the action of the spring pressure.

Of course, as shown in fig. 1, the bottom of the second piston 31 is provided with a groove 36, and the third piston 32 is provided with a projection 37, the projection 37 being fitted in the groove 36. The bottom of the second piston 31 is provided with a groove 36, the third piston 32 is provided with a protrusion 37, and the protrusion 37 can be matched in the groove 36, so that the matching between the second piston 31 and the third piston 32 can be more stable and reliable, the movement reliability of the second piston 31 and the third piston 32 can be ensured, and the braking effect of the vehicle can be better.

According to the utility model discloses vehicle, include: the relay valve assembly 1 described in the above embodiment.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the invention, the first feature being "on", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A relay valve assembly (1), comprising:

the brake system comprises a valve shell (10), wherein the valve shell (10) is provided with an air storage device interface (11), a master cylinder interface (12), a service brake chamber interface (13), a hand brake valve interface (14), a parking brake chamber interface (15), a first exhaust port (16), a second exhaust port (17), a relay valve cavity (18) and a differential valve cavity (19), the relay valve cavity (18) is respectively communicated with the air storage device interface (11), the master cylinder interface (12), the service brake chamber interface (13) and the first exhaust port (16), and the differential valve cavity (19) is respectively communicated with the air storage device interface (11), the hand brake valve interface (14), the parking brake chamber interface (15) and the second exhaust port (17);

a relay valve spool (20), the relay valve spool (20) disposed within the relay valve cavity (18) to selectively apply and release service braking; and

a differential valve spool (30), the differential valve spool (30) disposed within the differential valve cavity (19) to selectively perform parking braking and service.

2. Relay valve assembly (1) according to claim 1, characterized in that the master cylinder interface (12) and the hand brake valve interface (14) are arranged on top of the valve housing (10) with opposite opening directions.

3. Relay valve assembly (1) according to claim 2, characterised in that said air reservoir port (11), said service brake chamber port (13) and said parking brake chamber port (15) are provided at the bottom of said valve housing (10), the opening direction of said air reservoir port (11) being perpendicular to the opening direction of said service brake chamber port (13) and to the opening direction of said parking brake chamber port (15).

4. Relay valve assembly (1) according to claim 3, characterized in that the service brake chamber connection (13) and the parking brake chamber connection (15) are open in opposite directions, and the air reservoir connection (11) is open in a direction perpendicular to the master cylinder connection (12) and to the hand brake valve connection (14).

5. Relay valve assembly (1) according to claim 1, characterized in that the valve housing (10) comprises: main casing body (40) and bottom cover (41), bottom cover (41) set up in the bottom of main casing body (40) and with main casing body (40) prescribe a limit to relay valve cavity (18) with differential valve cavity (19) jointly, master cylinder interface (12) with hand brake valve interface (14) set up in the top of main casing body (40), gas storage device interface (11), service brake room interface (13), parking brake room interface (15), first exhaust port (16) and second exhaust port (17) set up in on bottom cover (41).

6. Relay valve assembly (1) according to claim 5, characterized in that a diaphragm (42) is provided in the main housing (40), and the chambers on both sides of the diaphragm (42) are the relay valve chamber (18) and the differential valve chamber (19), respectively.

7. A relay valve assembly (1) according to claim 1, wherein the relay valve spool (20) comprises: first piston (21), first push rod (22), first exhaust valve (23) and first admission valve (24), the top of first piston (21) with master cylinder interface (12) corresponding and the bottom with service brake chamber interface (13) are corresponding, first push rod (22) set up in the bottom of first piston (21), first exhaust valve (23) with first admission valve (24) set up in first push rod (22), first admission valve (24) communicate selectively gas storage device interface (11) with the bottom cavity of first piston (21), first exhaust valve (23) communicate selectively the bottom cavity of first piston (21) with first exhaust port (16).

8. Relay valve assembly (1) according to claim 1, characterized in that the differential valve spool (30) comprises: a second piston (31), a third piston (32), a second push rod (33), a second exhaust valve (34) and a second intake valve (35), the top of the second piston (31) corresponds to the hand brake valve interface (14), the third piston (32) is arranged at the bottom of the second piston (31), the bottom of the third piston (32) corresponds to the parking brake chamber interface (15), the second push rod (33) is arranged at the bottom of the third piston (32), the second exhaust valve (34) and the second intake valve (35) are provided to the second pushrod (33), the second air inlet valve (35) selectively communicates the air reservoir port (11) and the bottom cavity of the third piston (32), the second exhaust valve (34) selectively communicates the bottom cavity of the third piston (32) with the second exhaust port (17).

9. Relay valve assembly (1) according to claim 8, characterized in that the bottom of the second piston (31) is provided with a groove (36) and the third piston (32) is provided with a protrusion (37), which protrusion (37) fits within the groove (36).

10. A vehicle, characterized by comprising: a relay valve assembly (1) as claimed in any one of claims 1 to 9.

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