Trailer control valve and trailer control system

Abstract

The present application relates to the technical field of trailer control, and provides a trailer control valve and a trailer control system. The trailer control valve comprises: a relay piston and a balance piston arranged in a first chamber of the relay piston, two end faces of the relay piston are respectively communicated with a control port and a brake chamber, the balance piston is connected with a bottom wall of the first chamber through a pre-travel spring, and a space communicated with the brake chamber is left between the balance piston and a top wall of the first chamber; an adjusting piston is arranged in a second chamber of the relay piston and extends into the first chamber and is opposite to a valve port of the balance piston; a pre-travel adjusting port is communicated with the second chamber, and the adjusting piston is pushed to change the distance from the valve port to change the pre-travel of the air pressure of the air outlet relative to the control port with the change of the air pressure of the pre-travel adjusting port. The present application uses the adjusting piston to automatically adjust the pre-travel of the air pressure of the trailer control valve with the change of the air pressure of the pre-travel adjusting port, so as to improve the consistency of the main trailer braking and improve the safety performance of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of trailer control, in particular to a trailer control valve and a trailer control system. BACKGROUND

[0002] The trailer control valve is installed on a towing main vehicle and is used for controlling the braking of a trailer. Since the path of the brake gas output by the trailer control valve to the brake chamber of the trailer is long, and there is a certain loss in the transmission process of the brake gas, the trailer control valve is usually configured with an overrun amount (which refers to the increase amount of the air pressure value of the output gas relative to the control air pressure value to make the braking of the trailer synchronous with the main vehicle).

[0003] The current trailer control valve has an overrun amount that is fixed after being adjusted at the factory, and can only output according to the fixed overrun amount during subsequent use.

[0004] However, in the driving conditions of the trailer, the mass difference between the empty load and the heavy load is large, which means that the braking force required during braking is also different. Since the current trailer control valve is configured with a fixed overrun amount, it can only ensure the braking under the heavy load condition. When the trailer is lightly loaded or empty, the trailer is usually lighter, and the main vehicle is heavier. At this time, if the braking force is not adjusted, and the brake gas for the trailer braking is still output according to the fixed overrun amount, the problem of the tires of the trailer being easily locked when the brake is slightly pressed will occur, which will cause the tires of the trailer to rub on the ground, resulting in abnormal wear, and even cause a driving accident.

[0005] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] Therefore, the present application provides a trailer control valve and a trailer control system. The adjusting piston automatically adjusts the position when the air pressure of the overrun amount adjusting port changes, to change the distance between the valve port of the balancing piston, so that the air pressure overrun amount of the outlet port of the trailer control valve relative to the control port changes, and the air pressure overrun amount of the trailer control valve is automatically adjusted with the air pressure change of the overrun amount adjusting port, so that the air pressure overrun amount of the trailer control valve can be adjusted with the change of the load of the trailer, to improve the consistency of the main trailer braking, and improve the safety performance of the vehicle.

[0007] According to one aspect of the present application, a trailer control valve is provided, comprising a relay piston and a balance piston arranged in a first chamber of the relay piston; two end faces of the relay piston are respectively communicated with a control port and a brake chamber; the balance piston is connected to a bottom wall of the first chamber via a pre-travel spring, and a space is left between a top wall of the first chamber and the balance piston, which is communicated with the brake chamber; the trailer control valve further comprises an adjustment piston arranged in a second chamber of the relay piston, the adjustment piston extends into the first chamber and faces a valve port of the balance piston; a pre-travel adjustment port is communicated with the second chamber, and as the air pressure of the pre-travel adjustment port changes, the adjustment piston is pushed to change the distance from the valve port, so that the air pressure of the air outlet changes relative to the control port.

[0008] In some embodiments, the pre-travel adjustment port is connected with an air bag of a trailer; as the air pressure of the air bag decreases, the adjustment piston is pushed to be close to the valve port; as the air pressure of the air bag increases, the adjustment piston is pushed to be away from the valve port.

[0009] In some embodiments, the adjustment piston has a circular ring portion clamped to an inner wall of the second chamber, a first rod portion at a first end of the circular ring portion and a second rod portion at a second end of the circular ring portion, the first rod portion extends into the first chamber, and the second rod portion abuts against a bottom wall of the second chamber via a first spring; the pre-travel adjustment port is communicated with the second chamber where the first rod portion is located.

[0010] In some embodiments, a first end face of the circular ring portion is provided with an axially extending limiting rib, which is accommodated in the second chamber where the first rod portion is located, to limit the minimum distance between the adjustment piston and the valve port.

[0011] In some embodiments, the limiting rib comprises a plurality of circumferentially uniformly distributed.

[0012] In some embodiments, a circumferential wall of the circular ring portion is provided with an annular groove; a sealing ring sealingly fitted with an inner wall of the second chamber is embedded in the annular groove.

[0013] In some embodiments, the valve port is provided with a sealing gasket, which abuts against a top wall of the balance piston via a second spring; when the valve port is spaced apart from the adjustment piston, the sealing gasket seals and covers the valve port; when the balance piston pushes the pre-travel spring, the sealing gasket is pushed by the adjustment piston, the valve port is opened, and part of brake gas in the brake chamber enters a pressure regulating chamber via the valve port.

[0014] In some embodiments, the trailer control valve further comprises a valve member cooperating with the relay piston; when air is introduced into the control port, the relay piston pushes the valve member to make the brake chamber communicate with the air inlet.

[0015] In some embodiments, a main spring is connected between the relay piston and the valve wall of the trailer control valve; when air is introduced into the control port, the relay piston moves against the force of the main spring.

[0016] According to another aspect of the present application, a trailer control system is provided, comprising the trailer control valve according to any of the above embodiments, wherein the air outlet of the trailer control valve is connected to the brake air chamber of the trailer, and the pre-travel adjustment port of the trailer control valve is connected to the air bag of the trailer.

[0017] The present application has at least the following advantages compared with the prior art:

[0018] The trailer control valve and the trailer control system of the present application automatically adjust the position of the adjusting piston when the air pressure of the pre-travel adjustment port changes, to change the distance between the valve port of the adjusting piston and the balance piston, so that the air pressure pre-travel of the air outlet of the trailer control valve changes accordingly, and the air pressure pre-travel of the trailer control valve is automatically adjusted according to the air pressure of the pre-travel adjustment port, so that the air pressure pre-travel of the trailer control valve can be adjusted according to the load of the trailer, and the trailer control valve of the present application can output different air pressure pre-travels according to the load of the trailer, in addition to all the functions of the existing trailer control valve, to improve the consistency of the main trailer braking and the safety performance of the vehicle.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0021] Figure 1 Fig. 1 shows a structural schematic diagram of a trailer control valve in an embodiment of the present application;

[0022] Figure 2 Fig. 2 shows a structural schematic diagram of an adjusting piston in an embodiment of the present application. DETAILED DESCRIPTION

[0023] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to fully and completely convey the concept of the exemplary embodiments to those skilled in the art.

[0024] The accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore, repeated descriptions of them will be omitted. The terms "first," "second," and similar terms used in the specific description do not indicate any order, quantity, or importance, and the terms "top," "bottom," and similar terms are not used to limit orientation but only to distinguish different components. It should be noted that, unless otherwise specified, embodiments of the invention and features in different embodiments can be combined with each other.

[0025] Figure 1 The structure of the trailer control valve in the embodiment is shown, with reference to Figure 1 As shown, the trailer control valve provided in this embodiment of the invention includes:

[0026] The relay piston 30 and the balance piston 50 disposed in the first chamber 31 of the relay piston 30; the two end faces of the relay piston 30 are respectively connected to the control port 42 and located in the brake chamber 10; the balance piston 50 is connected to the bottom wall of the first chamber 31 through the advance spring 55, and a space 51 connecting the balance piston 50 to the top wall of the first chamber 31 is left to communicate with the brake chamber 10.

[0027] The trailer control valve also includes:

[0028] Adjusting piston 60 is located in the second chamber 32 of relay piston 30, and adjusting piston 60 extends into first chamber 31, facing valve port 52 of balance piston 50;

[0029] The advance adjustment port 44 is connected to the second chamber 32. As the air pressure at the advance adjustment port 44 changes, the adjustment piston 60 is pushed to change the distance between itself and the valve port 52, so that the air outlet (the air outlet is in...) Figure 1 (Not visible from the perspective of the air pressure) The pressure changes relative to the control port 42.

[0030] The control port 42 of the trailer control valve is connected to the foot brake of the main vehicle to receive brake air from the foot brake. When air enters through the control port 42, the brake air pushes the relay piston 30, causing the relay piston 30 to move against the force of the main spring 33 connected between it and the valve wall of the trailer control valve. The movement of the relay piston 30 pushes the cooperating valve 70, causing the intake valve 71 to open, thereby opening the brake chamber 10 and the air intake port (the air intake port is located at...). Figure 1The inlet of the trailer control valve is connected with the air cylinder of the main vehicle, and the outlet is connected with the brake chamber of the trailer. When the inlet valve 71 is opened, the brake gas from the air cylinder is transmitted to the brake chamber of the trailer through the inlet, the brake chamber 10 and the outlet, so as to realize the braking of the trailer.

[0031] With the continuous increase of the air pressure of the outlet, part of the brake gas in the brake chamber 10 enters the space 51 and pushes the balance piston 50 to move against the force of the pre-travel spring 55 until the valve port 52 contacts the adjusting piston 60 to be opened. When the valve port 52 is opened, part of the brake gas in the brake chamber 10 enters the pressure regulating chamber 56 through the valve port 52 and pushes the balance piston 50 to move reversely until the valve port 52 is in contact with the adjusting piston 60 and the top wall of the balance piston 50 to seal. At this time, the air pressure of the outlet reaches balance.

[0032] The valve port 52 is provided with a sealing gasket 57 which is abutted against the top wall of the balance piston 50 by the second spring 58; the sealing gasket 57 seals the valve port 52 when the valve port 52 is spaced from the adjusting piston 60; when the balance piston 50 pushes the pre-travel spring 55 until the sealing gasket 57 is pushed by the adjusting piston 60, the valve port 52 is opened, and part of the brake gas in the brake chamber 10 enters the pressure regulating chamber through the valve port 52.

[0033] In the above braking process, before the valve port 52 is opened, the increase of the air pressure value of the outlet relative to the air pressure value of the control port 42 is the pre-travel air pressure. The greater the pre-travel air pressure, the greater the brake air pressure of the brake chamber of the output trailer, and the greater the braking force of the trailer; the smaller the pre-travel air pressure, the smaller the brake air pressure of the brake chamber of the output trailer, and the smaller the braking force of the trailer.

[0034] In the trailer control valve of the present application, the adjusting piston 60 can automatically adjust the position when the air pressure of the pre-travel adjustment port 44 changes, so as to change the distance between the valve port 52 of the balance piston 50; when the distance between the adjusting piston 60 and the valve port 52 changes, the pre-travel air pressure of the outlet of the trailer control valve relative to the control port 42 changes, so as to automatically adjust the pre-travel air pressure of the trailer control valve with the change of the air pressure of the pre-travel adjustment port 44. The pre-travel adjustment port 44 can be connected to a gas supply source related to the load of the trailer, so as to automatically adjust the pre-travel air pressure of the trailer control valve with the change of the load of the trailer. The greater the load, the greater the pre-travel air pressure, and the smaller the load, the smaller the pre-travel air pressure, so that the trailer control valve of the present application can not only meet all the functions of the existing trailer control valve, but also output different pre-travel air pressures with the change of the load of the trailer, so as to improve the consistency of the main trailer braking and the safety performance of the vehicle.

[0035] In some embodiments, the pre-travel adjustment port 44 is connected to the air chamber of the trailer; as the air pressure of the air chamber decreases, the adjustment piston 60 is pushed to be closer to the valve port 52; as the air pressure of the air chamber increases, the adjustment piston 60 is pushed to be farther away from the valve port 52.

[0036] The air pressure of the air chamber of the trailer changes with the change of the load of the trailer, the greater the load of the trailer, the greater the air pressure of the air chamber. The air pressure of the air chamber can enter the trailer control valve through the pre-travel adjustment port 44, act on the adjustment piston 60, and change the distance between the adjustment piston 60 and the valve port 52 under different air pressures of the air chamber. Different distances between the adjustment piston 60 and the valve port 52 determine the size of the force of the main spring 33 that the relay piston 30 can bear when braking; the smaller the distance between the adjustment piston 60 and the valve port 52, the smaller the force of the main spring 33 that the relay piston 30 can bear, and the smaller the pre-travel amount; the greater the distance between the adjustment piston 60 and the valve port 52, the greater the force of the main spring 33 that the relay piston 30 can bear, and the greater the pre-travel amount.

[0037] By connecting the pre-travel adjustment port 44 to the air chamber of the trailer, the pre-travel amount of the trailer control valve can be intelligently adjusted according to the change of the load of the trailer, and only a slight change is needed for the original pipeline layout of the vehicle, that is, a pipeline connecting the pre-travel adjustment port 44 of the trailer air chamber and the trailer control valve is added, so that the consistency of the main trailer braking can be improved, and the safety performance of the vehicle can be improved.

[0038] In other embodiments, the pre-travel adjustment port 44 can also be connected to other suitable gas sources, as long as the air pressure of the pre-travel adjustment port 44 increases as the load of the trailer increases, and the air pressure of the pre-travel adjustment port 44 decreases as the load of the trailer decreases.

[0039] Figure 2 The structure of the adjustment piston in the embodiment is shown; in combination with Figure 1 and Figure 2 In some embodiments, the adjustment piston 60 has a circular ring part 62 engaged with the inner wall of the second chamber 32, a first rod part 63 located at the first end of the circular ring part 62, and a second rod part 64 located at the second end of the circular ring part 62, the first rod part 63 extends into the first chamber 31, and the second rod part 64 is abutted against the bottom wall of the second chamber 32 by the first spring 66; the pre-travel adjustment port 44 communicates with the second chamber 32 where the first rod part 63 is located.

[0040] In this way, when the air pressure of the pre-travel adjustment port 44 increases, the gas in the second chamber 32 where the first rod part 63 is located pushes the adjustment piston 60 away from the valve port 52; when the air pressure of the pre-travel adjustment port 44 decreases, the first spring 66 pushes the adjustment piston 60 closer to the valve port 52.

[0041] In some embodiments, the first end surface of the annular portion 62 is provided with an axially extending limiting rib 68, which is accommodated in the second cavity 32 where the first rod portion 63 is located, so as to limit the minimum distance between the adjusting piston 60 and the valve port 52.

[0042] Through the limiting rib 68, the minimum distance between the adjusting piston 60 and the valve port 52 can be maintained in the case that the air pressure of the pre-amount adjusting port 44 is very small, so as to ensure that the trailer control valve has the most basic air pressure pre-amount.

[0043] In some embodiments, the limiting rib 68 includes a plurality of circumferentially uniformly distributed limiting ribs. In this way, the stable limiting effect on the adjusting piston 60 can be achieved.

[0044] In some embodiments, the peripheral wall of the annular portion 62 is provided with an annular groove 61, and a sealing ring that is in sealing cooperation with the inner wall of the second cavity 32 is embedded in the annular groove 61. In this way, the sealing cooperation between the adjusting piston 60 and the inner wall of the second cavity 32 can be achieved.

[0045] Further, continuing to refer to Figure 1 As shown in the figure, the trailer control valve is further provided with another control port 41, which is connected with the foot brake of the host vehicle and is in redundant design with the control port 42. The trailer control valve is further provided with a control port 43 connected with the hand brake of the host vehicle. These structures are conventional structures of the trailer control valve, and will not be described in detail.

[0046] The embodiments of the present application further provide a trailer control system, which comprises the trailer control valve described in any of the above embodiments. The air outlet of the trailer control valve is connected with the brake air chamber of the trailer, and the pre-amount adjusting port 44 of the trailer control valve is connected with the air bag of the trailer. The air pressure of the air bag of the trailer is ingeniously used to adjust the air pressure pre-amount of the trailer control valve, so that the air pressure pre-amount of the trailer control valve can be actively adjusted according to the load of the trailer, so as to improve the consistency of the host-trailer braking and improve the safety performance of the vehicle. Moreover, only slight changes need to be made to the original pipeline layout of the vehicle, and a pipeline connecting the air bag of the trailer with the pre-amount adjusting port 44 of the trailer control valve is added.

[0047] In summary, the trailer control valve and the trailer control system of the present application have the following beneficial effects:

[0048] With the adjusting piston 60, the position is automatically adjusted when the air pressure of the pre-travel adjustment port 44 changes, so as to change the distance between the valve port 52 of the balance piston 50, so that the air outlet of the trailer control valve changes the air pressure pre-travel of the control port 42, and the air pressure pre-travel of the trailer control valve is automatically adjusted with the air pressure of the pre-travel adjustment port 44; when the pre-travel adjustment port 44 is connected with the air bag of the trailer, the air pressure pre-travel of the trailer control valve can be adjusted with the change of the load of the trailer, the greater the load, the greater the air pressure pre-travel, the smaller the load, the smaller the air pressure pre-travel, so that the trailer control valve of the application can realize the output of different air pressure pre-travel with the change of the load of the trailer in addition to meeting all the functions of the existing trailer control valve, so as to improve the consistency of the main trailer braking and improve the safety performance of the vehicle.

[0049] The above is a further detailed description of the application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the application to these descriptions. For ordinary skilled persons in the technical field to which the application belongs, some simple deductions or substitutions can be made without departing from the concept of the application, and all of them should be considered as falling within the protection scope of the application.

Claims

1. A trailer control valve, comprising a relay piston and a balance piston arranged in a first chamber of the relay piston; two end faces of the relay piston are respectively communicated with a control port and a brake chamber, the balance piston is connected with a bottom wall of the first chamber through a pre-travel spring, and a space between the balance piston and a top wall of the first chamber is communicated with the brake chamber; characterized in that the trailer control valve further comprises: an adjustment piston arranged in a second chamber of the relay piston, the adjustment piston extends into the first chamber and faces a valve port of the balance piston; a pre-travel adjustment port communicated with the second chamber, as the air pressure of the pre-travel adjustment port changes, the adjustment piston is pushed to change the distance from the valve port, so that the air pressure of the air outlet changes in advance relative to the control port; wherein the pre-travel adjustment port is connected with an air bag of a trailer, as the air pressure of the air bag decreases, the adjustment piston is pushed to be close to the valve port, and as the air pressure of the air bag increases, the adjustment piston is pushed to be away from the valve port.

2. The trailer control valve of claim 1, wherein, the adjustment piston has a circular ring portion engaged with an inner wall of the second chamber, a first rod portion at a first end of the circular ring portion and a second rod portion at a second end of the circular ring portion, the first rod portion extends into the first chamber, and the second rod portion abuts against a bottom wall of the second chamber through a first spring; the pre-travel adjustment port is communicated with the second chamber where the first rod portion is located.

3. The trailer control valve of claim 2, wherein, a first end face of the circular ring portion is provided with an axially extending limiting rib, the limiting rib is accommodated in the second chamber where the first rod portion is located to limit the minimum distance between the adjustment piston and the valve port.

4. The trailer control valve of claim 3, wherein, the limiting rib comprises a plurality of limiting ribs uniformly distributed in a circumferential direction.

5. The trailer control valve of claim 2, wherein, a circumferential wall of the circular ring portion is provided with an annular groove; a sealing ring in sealing cooperation with the inner wall of the second chamber is embedded in the annular groove.

6. The trailer control valve of claim 1, wherein, the valve port is provided with a sealing gasket, and the sealing gasket abuts against a top wall of the balance piston through a second spring; the sealing gasket seals and covers the valve port when the valve port is spaced apart from the adjustment piston; when the balance piston pushes the pre-travel spring, the sealing gasket is pushed by the adjustment piston, the valve port is opened, and part of brake gas in the brake chamber enters a pressure regulating chamber through the valve port.

7. The trailer control valve of claim 1, wherein, further comprising: a valve member cooperating with the relay piston; when the control port is supplied with air, the relay piston pushes the valve member to make the brake chamber communicated with an air inlet.

8. The trailer control valve of claim 7, wherein, a main spring is connected between the relay piston and a valve wall of the trailer control valve; when the control port is supplied with air, the relay piston moves against the action force of the main spring.

9. A trailer control system characterized by, the trailer control valve according to any one of claims 1-8, an air outlet of the trailer control valve is connected with a brake air chamber of a trailer, and a pre-travel adjustment port of the trailer control valve is connected with an air bag of the trailer.

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