Relay valve and braking system

Abstract

The application relates to the brake technical field and provides a relay valve and a brake system. The relay valve comprises a first shell, a second shell and a relay piston, the relay piston and the first shell define a control cavity, the first shell is provided with a control interface, the relay piston and the second shell define a brake cavity, and the second shell is provided with an exhaust interface; the first shell is further provided with a communication cavity which is in communication with the control cavity and the brake cavity; the relay valve further comprises a first check valve which is arranged in the communication cavity and can cut off the communication cavity under the action of the gas pressure of the control cavity and can guide the communication cavity to be in communication under the action of the gas pressure of the brake cavity; in the state that the brake is released and the exhaust interface is blocked, the gas pressure in the brake cavity pushes the first check valve to guide the communication cavity to be in communication. When the brake is released, if the exhaust interface is blocked, the gas in the brake cavity can push the first check valve to guide the communication cavity to be in communication, so that the brake pressure is discharged through the control interface, and the safety of the vehicle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the brake technical field, specifically, relates to relay valve and brake system. BACKGROUND

[0002] The relay valve is a part of the automobile brake system, especially for the brake system of the truck, which can shorten the brake reaction time and play a fast release role when the brake is released.

[0003] Figure 1 The structure of the existing relay valve is shown, and its working principle is as follows:

[0004] When the vehicle is running normally, the compressed air from the air tank enters through the air inlet 81, the air inlet valve 82 is closed, the air outlet 84 connected with the brake chamber is connected with the atmosphere through the air outlet 85;

[0005] When braking, the compressed air discharged from the brake valve enters the A cavity from the control port 86, so that the piston 87 closes the air outlet valve 83 downward, and then the air inlet valve 82 is opened, then the compressed air input from the air inlet 81 is transmitted to the brake chamber through the B cavity and the air outlet 84, and when the air inlet valve 82 and the air outlet valve 83 are closed at the same time, the balance is reached;

[0006] When the brake is released, the air pressure in the A cavity is zero, the piston 87 rises, the air outlet valve 83 is opened, the air inlet valve 82 is closed, and the air pressure in the brake chamber is discharged into the atmosphere through the air outlet 84, the air outlet valve 83 and the air outlet 85.

[0007] The existing relay valve has the following problems:

[0008] When the air outlet 85 is blocked (may be caused by water entering the air outlet 85 and freezing, or being blocked by snow in rainy and snowy weather, etc.), the air pressure in the valve cannot be discharged when the brake is released, which causes the sealing wear in the valve and the vehicle brake drag, and causes traffic accidents.

[0009] 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 which does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0010] Therefore, the present application provides a relay valve and brake system, which can cooperate with the first check valve and the relay piston, so that when the brake is released, if the air outlet is blocked, the air in the valve can be discharged through the gap between the first check valve and the first housing, through the control port, so as to discharge the brake pressure, avoid the sealing wear in the valve and the vehicle brake drag, and improve the safety of the vehicle.

[0011] One aspect of the present application provides a relay valve, comprising a first housing, a second housing, and a relay piston, the relay piston and the first housing defining a control cavity therebetween, the first housing being provided with a control interface communicating with the control cavity, the relay piston and the second housing defining a brake cavity therebetween, the second housing being provided with an exhaust interface communicating with the brake cavity; the first housing is further provided with a communication cavity communicating with the control cavity and the brake cavity, the relay valve further comprising: a first check valve arranged in the communication cavity, the first check valve being capable of cutting off the communication cavity under the action of the gas pressure in the control cavity and capable of conducting the communication cavity under the action of the gas pressure in the brake cavity; in the state of brake release and the exhaust interface being blocked, the gas pressure in the brake cavity pushes the first check valve to conduct the communication cavity.

[0012] In some embodiments, in the state of brake release and the exhaust interface not being blocked, the gas in the brake cavity is partially discharged through the exhaust interface and partially pushes the first check valve to conduct the communication cavity to be discharged through the control interface.

[0013] In some embodiments, the second housing is further provided with an air inlet interface and an air outlet interface communicating with the brake cavity, and the brake cavity is provided with a brake valve capable of cutting off a brake path of the air inlet interface to the air outlet interface through the brake cavity; in the brake state, the first check valve cuts off the communication cavity under the action of the gas pressure in the control cavity, the relay piston cuts off the passage between the brake cavity and the exhaust interface under the action of the gas pressure in the control cavity and the pushing of the first check valve, and the brake valve conducts the brake path under the pushing of the relay piston.

[0014] In some embodiments, the inner wall of the communication cavity has a stepped channel, and the first check valve comprises: a cylindrical sealing plug arranged in the stepped channel, the cylindrical sealing plug being in gap fit with the wall surface of the stepped channel, capable of sealingly abutting the stepped surface of the stepped channel under the action of the gas pressure in the control cavity, and capable of leaving the stepped surface under the action of the gas pressure in the brake cavity.

[0015] In some embodiments, the inner wall of the communication cavity further has a stepped wall corresponding to the stepped channel, and the first check valve further comprises: a limiting piston supported on the stepped wall, the limiting piston and the stepped surface defining a movement space of the cylindrical sealing plug.

[0016] In some embodiments, the first check valve further comprises: a clamp clamped in a groove of the stepped wall, located on the side of the limiting piston away from the cylindrical sealing plug.

[0017] In some embodiments, the communication cavity and the control cavity are communicated through an inclined hole.

[0018] In some embodiments, the relay valve further includes a second check valve disposed in the exhaust passage leading from the brake chamber to the exhaust port. The second check valve can cut off the exhaust passage and can open the exhaust passage under the action of air pressure in the brake chamber.

[0019] In some embodiments, the valve body of the second check valve is connected to the inner wall of the exhaust passage by a spring; in the braking state, the valve body of the second check valve cuts off the exhaust passage under the action of the spring; in the state of brake release and the exhaust port not being blocked, the gas in the braking chamber partially pushes the second check valve to open the exhaust passage and partially pushes the first check valve to open the connecting cavity.

[0020] Another aspect of the present invention provides a braking system configured with a relay valve as described in any of the above embodiments; wherein the control interface of the relay valve is connected to the brake valve of the braking system, the air inlet of the relay valve is connected to the air reservoir of the braking system, the air outlet of the relay valve is connected to the brake chamber of the braking system, and the exhaust port of the relay valve is open to the atmosphere.

[0021] The beneficial effects of this invention compared to the prior art include at least the following:

[0022] The relay valve of the present invention has a connecting cavity in the first housing that connects the control cavity and the braking cavity, and a first check valve is provided in the connecting cavity. The first check valve can cut off and open the connecting cavity under the action of air pressure in the control cavity and air pressure in the braking cavity, respectively, to adapt to different driving conditions of the vehicle. When the brake is released and the exhaust port is blocked, the gas pressure in the braking cavity pushes the first check valve to open the connecting cavity, forming an exhaust path of braking cavity → connecting cavity → control cavity → control port. This can timely and smoothly discharge the brake pressure in the braking cavity, avoid wear of the valve seal and vehicle braking drag, and improve vehicle safety.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0025] Figure 1 This is a schematic diagram of the structure of an existing relay valve;

[0026] Figure 2 This is a schematic diagram of the structure of a relay valve including a first check valve in an embodiment of the present invention, wherein the exhaust path is shown when the exhaust port is blocked;

[0027] Figure 3 This is a schematic diagram of the structure of a relay valve including a first check valve in an embodiment of the present invention, wherein the exhaust path is shown when the exhaust port is not blocked;

[0028] Figure 4 This is a schematic diagram of the structure of a relay valve including a first check valve in an embodiment of the present invention, wherein the braking path is indicated;

[0029] Figure 5 This is a schematic diagram of the structure of a relay valve including a first check valve in an embodiment of the present invention, wherein the structural components of the first check valve are shown.

[0030] Figure 6 This is a schematic diagram of the structure of a relay valve including a first check valve and a second check valve in an embodiment of the present invention. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] The use of terms such as "first," "second," and similar terms in the specific description does not indicate any order, quantity, or importance, but is merely used to distinguish different components. In the description of this invention, terms such as "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0034] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features in different embodiments can be combined with each other.

[0035] Figure 2 The structure of a relay valve including a first check valve is shown, with the exhaust path indicated when the exhaust port is blocked; see reference. Figure 2 As shown, the relay valve provided in this embodiment of the invention includes:

[0036] A first housing 10, a second housing 20, and a relay piston 30 are provided. A control cavity 100 is defined between the relay piston 30 and the first housing 10. The first housing 10 has a control interface 11 that communicates with the control cavity 100. A braking cavity 200 is defined between the relay piston 30 and the second housing 20. The second housing 20 has an exhaust interface 22 that communicates with the braking cavity 200.

[0037] The first housing 10 also has a connecting cavity 15 that connects the control cavity 100 and the braking cavity 200. The relay valve also includes:

[0038] The first check valve 40 is disposed in the connecting cavity 15. The first check valve 40 can cut off the connecting cavity 15 under the action of the air pressure of the control cavity 100, and can open the connecting cavity 15 under the action of the air pressure of the braking cavity 200.

[0039] When the brake is released and the exhaust port 22 is blocked, the gas pressure in the brake chamber 200 pushes the first check valve 40 to open the connecting chamber 15.

[0040] The aforementioned relay valve has a connecting cavity 15 in the first housing 10 that connects the control cavity 100 and the brake cavity 200. A first check valve 40 is installed in the connecting cavity 15. The first check valve 40 can cut off and open the connecting cavity 15 under the action of air pressure in the control cavity 100 and the brake cavity 200, respectively, to adapt to different driving conditions of the vehicle. When the brake is released and the exhaust port 22 is blocked, the gas pressure in the brake cavity 200 pushes the first check valve 40 to open the connecting cavity 15, forming the first exhaust path P1 of brake cavity 200 → connecting cavity 15 → control cavity 100 → control port 11. This can timely and smoothly discharge the brake pressure in the brake cavity 200, avoid valve seal wear and vehicle braking drag, and improve vehicle safety.

[0041] Figure 3 The structure of a relay valve including a first check valve is shown, with the exhaust path indicated when the exhaust port is not blocked; combined with Figure 2 and Figure 3 As shown, in some embodiments:

[0042] When the brake is released and the exhaust port 22 is not blocked, the gas in the brake chamber 200 is partially discharged through the exhaust port 22 and partially pushes the first check valve 40 to open the connecting chamber 15 so as to be discharged through the control port 11.

[0043] When the brake is released, provided that the exhaust port 22 is not blocked, the control air pressure at the upper end of the relay piston 30 is discharged through the control port 11. Most of the braking pressure in the brake chamber 200 is discharged into the atmosphere through the second exhaust path P2 from the brake chamber 200 to the exhaust port 22, and a small portion of the braking pressure is discharged through the first exhaust path P1 mentioned above.

[0044] Figure 4 The structure of a relay valve including a first check valve is shown, with the braking path indicated; combined with Figures 2 to 4 As shown, in some embodiments:

[0045] The second housing 20 is also provided with an air inlet 24 and an air outlet (not shown in the figure) that connect to the brake chamber 200. The brake chamber 200 is provided with a brake valve 28, which can cut off the brake path P3 from the air inlet 24 to the air outlet through the brake chamber 200.

[0046] In the braking state, the first check valve 40 cuts off the connecting chamber 15 under the action of the air pressure in the control chamber 100, the relay piston 30 cuts off the passage between the brake chamber 200 and the exhaust port 22 under the action of the air pressure in the control chamber 100 and the push of the first check valve 40, and the brake valve 28 opens the brake path P3 under the push of the relay piston 30.

[0047] Thus, during braking, the braking gas from the intake port 24 can be delivered to the brake chamber via the brake chamber 200 and the exhaust port, generating vehicle braking force. At this time, the first check valve 40 can seal and cut off the connecting chamber 15 under the action of the air pressure in the control chamber 100, preventing the brake chamber 200 from communicating with the control chamber 100 and causing gas leakage.

[0048] Figure 5 The structure of a relay valve including a first check valve is shown, with structural components of the first check valve indicated; combined with Figures 2 to 5 As shown, in some embodiments, the inner wall of the communicating cavity 15 has a stepped channel, and the first check valve 40 includes:

[0049] A cylindrical sealing plug 42 is disposed in the stepped channel. The cylindrical sealing plug 42 is in clearance fit with the wall surface 152 of the stepped channel. It can seal against the stepped surface 153 of the stepped channel under the air pressure of the control cavity 100, and can leave the stepped surface 153 under the air pressure of the braking cavity 200.

[0050] With the cooperation of the cylindrical sealing plug 42 and the stepped channel, in the braking state, the cylindrical sealing plug 42 seals against the stepped surface 153 under the air pressure of the control chamber 100 to cut off the connecting chamber 15; in the braking release state, the cylindrical sealing plug 42 leaves the stepped surface 153 under the air pressure of the braking chamber 200 to open the connecting chamber 15.

[0051] Continue to combine Figures 2 to 5 As shown, in some embodiments, the inner wall of the communicating cavity 15 further has a stepped wall 155 corresponding to the stepped channel, and the first check valve 40 further includes:

[0052] The limiting piston 44 is supported on the stepped wall 155, and the limiting piston 44 and the stepped surface 453 define the movement space of the cylindrical sealing plug 42.

[0053] The cylindrical sealing plug 42 is prevented from dislodging by the limiting piston 44 supported on the stepped wall 155.

[0054] In some embodiments, the first check valve 40 further includes a clamp 45, which engages in a groove in the stepped wall 155 and is located on the side of the limiting piston 44 away from the cylindrical sealing plug 42.

[0055] The movement of the limiting piston 44 is restricted by the clamp 45.

[0056] In some embodiments, the communicating cavity 15 and the control cavity 100 are connected by an oblique hole 16.

[0057] Figure 6 This illustrates the structure of a relay valve comprising a first check valve and a second check valve; combined with Figures 1 to 6 As shown, in some embodiments, the relay valve further includes:

[0058] The second check valve 50 is installed in the exhaust passage 500 of the brake chamber 200 leading to the exhaust port 22. The second check valve 50 can cut off the exhaust passage 500 and can open the exhaust passage 500 under the action of air pressure in the brake chamber 200.

[0059] The second check valve 50 is installed in the exhaust passage 500. When not in exhaust mode, it can cut off the exhaust passage 500, thus providing waterproofing. Specifically, when the vehicle is wading through water, because the second check valve 50 cuts off the exhaust passage 500, water cannot enter the valve body through the exhaust passage 500, nor will it be carried into the brake lines and brake chambers by the relay valve, thereby avoiding internal contamination of the braking system and corrosion of parts, achieving water immersion protection.

[0060] In the exhaust state, the gas pressure in the brake chamber 200 can push the second check valve 50 to open the exhaust passage 500, ensuring smooth exhaust.

[0061] In some embodiments, the valve body of the second check valve 50 is connected to the inner wall of the exhaust passage 500 via a spring 55;

[0062] In the braking state, the valve body of the second check valve 50 cuts off the exhaust passage 500 under the action of the spring 55;

[0063] When the brake is released and the exhaust port 22 is not blocked, the gas in the brake chamber 200 partially pushes the second check valve 50 to open the exhaust passage 500 and partially pushes the first check valve 40 to open the connecting chamber 15.

[0064] Figure 6 The braking process of the relay valve shown is similar to Figures 2 to 5 The braking process of the relay valve shown is the same and will not be described again. Figure 6 During the brake release process, the control air pressure at the upper end of the relay piston 30 is discharged through the control interface 11. Most of the brake pressure in the brake chamber 200 is discharged into the atmosphere through the exhaust channel 500 and the exhaust interface 22. Due to the return force of the spring 55, the brake pressure cannot be completely discharged through the exhaust interface 22. A small amount of brake pressure can be discharged from the first check valve 40, that is, through the connecting chamber 15 and the control interface 11.

[0065] This invention also provides a braking system configured as follows: Figures 2 to 6 The relay valve described in any embodiment; wherein, the control interface 11 of the relay valve is connected to the brake valve of the braking system, the air inlet 24 of the relay valve is connected to the air tank of the braking system, the air outlet of the relay valve is connected to the brake air chamber of the braking system, and the exhaust interface 22 of the relay valve is open to the atmosphere.

[0066] The braking system can be ABS (Antilock Braking System) or other suitable braking systems. The braking system uses the aforementioned relay valve, which allows for smooth discharge of brake pressure through the movement of the first check valve 40 when the exhaust port 22 is blocked, improving vehicle safety. Furthermore, it provides waterproof protection through the second check valve 50 when the vehicle is wading through water, enhancing the reliability of the braking system.

[0067] In summary, the relay valve and braking system of the present invention, in addition to fulfilling the functions of existing relay valves, can also promptly discharge braking pressure and improve the waterproof rating of the valve body through the first check valve 40 and the second check valve 50, thereby avoiding problems such as wear of the valve internal seals, vehicle braking drag, and pollution and corrosion of the braking system, and improving vehicle safety.

[0068] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A relay valve comprising a first housing, a second housing, and a relay piston, the relay piston and the first housing defining a control chamber therebetween, the first housing being provided with a control port communicating with the control chamber, the relay piston and the second housing defining a brake chamber therebetween, the second housing being provided with an exhaust port communicating with the brake chamber; characterized in that the first housing being further provided with a communication chamber communicating with the control chamber and the brake chamber, the second housing being further provided with an intake port and an exhaust port communicating with the brake chamber, the brake chamber being provided with a brake valve capable of interrupting a brake path of the intake port through the brake chamber to the exhaust port; the relay valve further comprising: a first check valve disposed in the communication chamber, the first check valve being capable of interrupting the communication chamber under the action of the gas pressure in the control chamber and capable of conducting the communication chamber under the action of the gas pressure in the brake chamber; in a braking state, the first check valve interrupts the communication chamber under the action of the gas pressure in the control chamber, the relay piston interrupts the path between the brake chamber and the exhaust port under the action of the gas pressure in the control chamber and the push of the first check valve, and the brake valve conducts the brake path under the push of the relay piston; in a brake release and the exhaust port being blocked state, the gas pressure in the brake chamber pushes the first check valve to conduct the communication chamber, forming an exhaust path from the brake chamber through the communication chamber and the control chamber to the control port.

2. The relay valve according to claim 1, wherein in a brake release and the exhaust port being unblocked state, the gas in the brake chamber is partially exhausted through the exhaust port and partially pushes the first check valve to conduct the communication chamber to be exhausted through the control port.

3. The relay valve according to claim 1 or 2, characterized in that, the inner wall of the communication chamber has a stepped passage, the first check valve comprising: a cylindrical sealing plug disposed in the stepped passage, the cylindrical sealing plug being in clearance fit with the wall surface of the stepped passage, capable of sealingly abutting the stepped surface of the stepped passage under the action of the gas pressure in the control chamber and capable of leaving the stepped surface under the action of the gas pressure in the brake chamber.

4. The relay valve according to claim 3, wherein the inner wall of the communication chamber further has a stepped wall corresponding to the stepped passage, the first check valve further comprising: a limiting piston supported on the stepped wall, the limiting piston and the stepped surface defining a movement space of the cylindrical sealing plug.

5. The relay valve as set forth in claim 4, wherein the first check valve further comprising: a clamp clamped in a groove of the stepped wall, located on the side of the limiting piston away from the cylindrical sealing plug.

6. The relay valve as set forth in claim 1, wherein the communication chamber and the control chamber are communicated through an inclined hole.

7. The relay valve according to claim 1 or 2, wherein further comprising: a second check valve disposed in an exhaust passage of the brake chamber leading to the exhaust port, the second check valve being capable of interrupting the exhaust passage and capable of conducting the exhaust passage under the action of the gas pressure in the brake chamber.

8. The relay valve according to claim 7, wherein the valve body of the second check valve is connected to the inner wall of the exhaust passage through a spring; in a braking state, the valve body of the second check valve interrupts the exhaust passage under the action of the spring. In the state that the brake is released and the exhaust interface is not blocked, the gas in the brake chamber partially pushes the second check valve to open the exhaust passage and partially pushes the first check valve to open the communication chamber.

9. A brake system characterized by, The relay valve is configured as claimed in any one of claims 1-8. The control interface of the relay valve is connected to the brake valve of the brake system, the air inlet interface of the relay valve is connected to the air tank of the brake system, the air outlet interface of the relay valve is connected to the brake chamber of the brake system, and the exhaust interface of the relay valve is connected to the atmosphere.

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