Air leakage type brake and vehicle

Abstract

The utility model relates to the technical field of engine braking, in particular to an air leakage type brake and a vehicle. The air leakage type brake comprises a support, and the support is provided with a brake mounting cavity, a valve mounting cavity, a first flow channel, a second flow channel and an air leakage channel; a control cavity is formed in the upper portion of the brake mounting cavity, and a brake cavity is formed in the lower portion of the brake mounting cavity and communicates with the control cavity. The electric control valve is mounted in the valve mounting cavity; the electric control valve comprises an inlet, an outlet and a drainage port, the first flow channel communicates with the inlet and the outside, the second flow channel communicates with the outlet and the control cavity, and the drainage channel communicates with the drainage port and the outside; the control assembly is arranged in the control cavity so as to control the opening and closing state of a communication channel between the control cavity and the brake cavity. The brake assembly is arranged in the brake cavity in a sliding mode and used for making contact with the air valve structure. According to the air leakage type brake, the control assembly and the brake assembly are located in the same brake mounting cavity, so that the structures of the control assembly and the brake assembly are compact.

Description

Technical Field

[0001] The utility model relates to the technical field of engine braking, in particular to an air-deflation type brake and a vehicle. Background Art

[0002] When a vehicle is driving downhill, it needs to provide long-term stable braking force to ensure safety. It is difficult to meet the braking requirements by relying solely on the vehicle's braking system, and the brake pads are prone to overheating after long-term operation, resulting in reduced performance and reliability of the braking system, which in turn causes serious accidents due to brake failure. Engine blow-off brakes are widely used as auxiliary braking devices on large buses and heavy commercial vehicles. Their use effectively reduces the mechanical wear of traditional brakes, increases the service life of traditional brakes, effectively improves the safety and reliability of vehicle driving, greatly reduces the cost of vehicle use and maintenance, and improves transportation efficiency, especially improving the safety and reliability of heavy-loaded vehicles when driving down long slopes.

[0003] CN200955442Y discloses a vehicle engine deflation brake device, such as Figure 1 As shown, the device has an oil passage 3, one end of the oil passage 3 has a piston inner cavity 5, a brake piston is arranged in the piston inner cavity 5, a spring 6 is arranged on the brake piston, and the brake piston 7 is located above the engine exhaust valve; the other end of the oil passage 3 is provided with a control valve 2; the outer end of the control valve 2 is provided with a solenoid valve 1. The brake assembly and the control valve in this automobile engine blowdown brake device occupy a large space. Utility Model Content

[0004] The utility model aims to provide an air-deflation brake and a vehicle, so as to solve the technical problem that the brake assembly and the control valve in the air-deflation brake device of the automobile engine in the prior art occupy a large space to a certain extent.

[0005] It should be noted that the air-deflation brake provided by the utility model can assist braking as needed.

[0006] The utility model provides an air-release brake, comprising: a bracket, on which a brake mounting chamber, a valve mounting chamber, a first flow channel, a second flow channel and a leakage channel are provided; a control chamber is formed at the upper part of the brake mounting chamber, a brake chamber is formed at the lower part of the brake mounting chamber, and the control chamber and the brake chamber are connected; an electric control valve is installed in the valve mounting chamber; the electric control valve comprises an inlet, an outlet and a leakage port, the first flow channel is used to connect the inlet and the outside, the second flow channel connects the outlet and the control chamber, and the leakage channel is used to connect the leakage port and the outside; a control component is arranged in the control chamber to open and close the connecting channel between the control chamber and the brake chamber; a brake component is slidably arranged in the brake chamber and is used to contact with a valve structure.

[0007] In the air-deflation brake provided by the utility model, the control component and the brake component are located in the same brake mounting cavity. On the one hand, the structures of the control component and the brake component are compact, and the space occupied by the bracket is reduced, so that the volume of the bracket can be reduced, or more components can be arranged on the bracket to improve the space utilization of the bracket; on the other hand, the control component and the brake component are integrated in the same brake mounting cavity, so that the air-deflation brake has a high degree of integration, reduces the flow channel setting, and reduces the risk of leakage.

[0008] Furthermore, the control component includes: a control piston, which is slidably arranged in the control chamber; a control chamber spring, which is connected between the control chamber and the control piston; a connecting port connected to the brake chamber is provided at the bottom of the connecting channel; a blocking member, which is located in the brake chamber; in a non-braking state, the control piston is in contact with the blocking member, and the blocking member is away from the connecting port; in a braking state, the control piston is disengaged from the blocking member, and the blocking member blocks the connecting port; a brake chamber spring, which is located in the brake chamber, and one end of the brake chamber spring is connected to the blocking member; the brake component includes: a brake piston, which slides along the brake chamber, and the other end of the brake chamber spring is connected to the brake piston; a limit member, which is arranged in the brake chamber and connected to the brake piston.

[0009] Furthermore, the control chamber also includes a threaded connection chamber arranged between the control chamber and the brake chamber; the control component also includes: an adjusting screw, including an upper part, a middle part and a lower part connected in sequence; at least part of the upper part is located in the control chamber, the middle part is connected to the threaded connection chamber, and the lower part is located in the brake chamber; a control inner chamber is provided on the adjusting screw, a connecting channel is provided at the lower part of the adjusting screw and connected to the control inner chamber, and the control chamber spring and the control piston are located in the control inner chamber; a flow port connecting the control chamber and the control inner chamber is provided at the upper part; and a limit member is connected between the lower part and the brake piston.

[0010] Furthermore, the limiting member is a limiting clamping spring; an annular protrusion is provided at the bottom of the lower part, and the limiting clamping spring can contact the protrusion.

[0011] Furthermore, an upper top opening is provided, and a pressure relief screw plug is provided at the opening.

[0012] Furthermore, an annular groove is provided on the upper part, and the flow port is arranged at the bottom of the annular groove.

[0013] Furthermore, a brake inner cavity is provided at the top of the brake piston, and the lower part is located in the brake inner cavity; the blocking member and the brake cavity spring are located in the brake inner cavity.

[0014] Furthermore, an annular mounting groove is provided on the outer wall of the brake piston; a brake retaining spring and a sealing ring are installed in the mounting groove, and the brake retaining spring is located on the inner side of the sealing ring.

[0015] Furthermore, the bracket includes: a first arm, a valve installation cavity is arranged in the first arm; a first flow channel is arranged in the first arm; a second arm is connected to the first arm; a plurality of brake installation cavities are arranged on the second arm along the length direction of the second arm; and a second flow channel is arranged in the second arm.

[0016] The utility model provides a vehicle, comprising: an engine and the above-mentioned deflated brake, wherein a bracket is mounted on the engine. It should be understood that both the aforementioned general description and the following specific embodiments are for the purpose of example and explanation and do not necessarily limit the present disclosure. The accompanying drawings incorporated into and constituting a part of the specification illustrate the subject matter of the present disclosure. At the same time, the specification and the drawings are used to explain the principles of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of an automobile engine deflation brake device in the prior art;

[0019] Figure 2 An exploded view of an air-deflation brake according to an embodiment of the utility model;

[0020] Figure 3 for Figure 2 A top view of the run-flat brake is shown;

[0021] Figure 4 for Figure 2 A front view of the run-flat brake is shown;

[0022] Figure 5 It is a cross-sectional view at 1-1 of the deflated brake shown in 3;

[0023] Figure 6 It is a cross-sectional view at 2-2 of the deflated brake shown in 3;

[0024] Figure 7 for Figure 4 The cross-sectional view at 3-3 of the deflated brake shown;

[0025] Figure 8 for Figure 2 A schematic diagram of the structure of the brake mounting cavity in the deflation brake shown;

[0026] Fig. 9 for Figure 2The schematic diagram of the structure of the control component and the brake component in the air-deflation brake is shown.

[0027] icon:

[0028] 1- bracket; 11- brake installation chamber; 12- valve installation chamber; 13- first flow channel; 14- second flow channel; 15- first support arm; 16- second support arm; 17- leakage channel; 111- control chamber; 112- brake chamber; 113- communication channel; 114- communication port; 115- threaded connection chamber;

[0029] 2-electric control valve; 21-inlet; 22-outlet;

[0030] 3-control assembly; 31-control piston; 32-control chamber spring; 33-blocking piece; 34-brake chamber spring; 35-adjusting screw; 36-pressure relief screw plug; 351-control inner chamber; 352-flow port; 353-annular groove;

[0031] 4-brake assembly; 41-brake piston; 42-limiting retaining spring; 43-sealing ring; 44-brake retaining spring;

[0032] 5-locking nut;

[0033] 6-Panel;

[0034] 7- Fasteners;

[0035] 8- Plug. DETAILED DESCRIPTION

[0036] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0037] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0038] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0039] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] like Figures 2 to 9 As shown, the utility model provides an air-release brake, comprising: a bracket 1, on which a brake mounting chamber 11, a valve mounting chamber 12, a first flow channel 13, a second flow channel 14 and a leakage channel 17 are provided; a control chamber 111 is formed at the upper part of the brake mounting chamber 11, and a brake chamber 112 is formed at the lower part of the brake mounting chamber 11, and the control chamber 111 and the brake chamber 112 are connected; an electric control valve 2 is installed in the valve mounting chamber 12; the electric control valve 2 comprises an inlet 21, an outlet 22 and a leakage port, the first flow channel 13 is used to connect the inlet 21 with the outside, the second flow channel 14 connects the outlet 22 and the control chamber 111, and the leakage channel 17 is used to connect the leakage port with the outside; a control component 3 is arranged in the control chamber 111 to open and close the connecting channel 113 between the control chamber 111 and the brake chamber 112; a brake component 4 is slidably arranged in the brake chamber 112, and is used to contact with a valve structure (the valve structure may be a valve bridge or a valve pin, etc.).

[0043] In this embodiment, when the engine operates normally, the electric control valve 2 is in a closed state, preventing the brake fluid from entering the control chamber 111 and the brake chamber 112, and the air-release brake does not operate.

[0044] When the engine brakes, the electric control valve 2 is opened, and the inlet 21 and the outlet 22 of the electric control valve 2 are connected; the brake medium enters the electric control valve 2 through the first flow channel 13 and the inlet 21, then enters the second flow channel 14 through the outlet 22, and then enters the control chamber 111 through the second flow channel 14; the control component 3 opens the connecting channel 113, and the brake fluid enters the brake chamber 112 from the control chamber 111 through the connecting channel 113, and the brake fluid pushes the brake piston 41 to move to the set position in the direction close to the valve structure, and as the exhaust valve structure gradually closes, the brake piston 41 contacts the valve structure; after the brake fluid fills the brake chamber 112, the control component 3 closes the connecting channel 113, and the brake chamber 112 forms a sealed chamber filled with incompressible brake fluid, and the control chamber 111, the second flow channel 14 and the first flow channel 13 are filled with brake fluid, and the brake fluid in the brake chamber 112 cannot flow back, so the brake piston 41 can resist the valve structure, so that the exhaust valve maintains a certain valve opening, so that the engine remains deflated, thereby realizing deflation braking.

[0045] When the engine brake is turned off, the electric control valve 2 is closed, the outlet 22 is connected to the drain port, the control component 3 opens the connecting channel 113, the valve structure is reset accordingly, the exhaust valve is reset, and the valve structure pushes the brake piston 41 to reset. During the resetting process of the brake piston 41, the brake fluid is discharged from the brake chamber 112, the connecting channel 113, the control chamber 111, the second flow channel 14, the outlet 22 and the drain port in sequence, and the brake is reset.

[0046] In the air-deflation brake provided in this embodiment, the control component 3 and the brake component 4 are located in the same brake mounting cavity 11. On the one hand, the control component 3 and the brake component 4 have compact structures and reduce the space occupied by the bracket 1, which can reduce the volume of the bracket 1, or set more components on the bracket 1 to improve the space utilization of the bracket 1; on the other hand, the control component 3 and the brake component 4 are integrated in the same brake mounting cavity 11, so that the air-deflation brake has a high degree of integration, reduces the flow channel setting, and reduces the risk of leakage.

[0047] The electric control valve 2 may be an electric valve or a solenoid valve.

[0048] The control component 3 may be an electric valve or a solenoid valve, that is, the communication channel 113 may be opened or closed by an electric control device.

[0049] As an alternative, Figure 7 and Fig. 9As shown, the control component 3 includes: a control piston 31, which is located in the control chamber 111; a control chamber spring 32, which is connected between the control chamber 111 and the control piston 31; a connecting port 114 connected to the brake chamber 112 is provided at the bottom of the connecting channel 113; in the initial state, the control piston 31 is in contact with the blocking member 33, and the blocking member 33 is away from the connecting port 114; the blocking member 33 is located in the brake chamber 112 and can block the connecting channel 113; the control piston 31 can be in contact with the blocking member 33; the brake chamber spring 34 is located in the brake chamber 112, and one end of the brake chamber spring 34 is connected to the blocking member 33; the brake component 4 includes: a brake piston 41, which slides along the brake chamber 112, and the other end of the brake chamber spring 34 is connected to the brake piston 41; a limit member is arranged in the brake chamber 112 and connected to the brake piston 41 to limit the stroke of the brake piston 41, so that the brake piston 41 moves within the specified stroke.

[0050] In this embodiment, by setting the size relationship between the pre-pressure of the control chamber spring 32 and the pre-pressure of the brake chamber spring 34, it is achieved that in the initial state, that is, the non-braking state of the engine, the control piston 31 is in contact with the blocking member 33, and the blocking member 33 is away from the connecting port 114, that is, the control piston 31 pushes the blocking member 33 open, and the connecting channel 113 is in an open state.

[0051] When the engine brakes, the electric control valve 2 opens, and the brake fluid enters the control chamber 111 through the first flow channel 13, the inlet 21, the outlet 22, and the second flow channel 14 in sequence, and then enters the brake chamber 112 through the connecting channel 113; in the control chamber 111, as the brake fluid enters, the control piston 31 moves away from the brake chamber 112 until it disengages from the blocking member 33; and the blocking member 33 moves toward the connecting port 114 under the push of the brake chamber spring 34 until the connecting port 114 is blocked, thereby blocking the connecting channel 113; as the brake fluid enters the brake chamber 112, the brake fluid pushes the brake piston 41 to move toward the valve structure.

[0052] The control assembly 3 of the embodiment of the utility model relies on the brake fluid and the mechanical structure to open and close the communication channel 113, avoiding the setting of the electric control structure, thus avoiding the setting of the lead channel and reducing the risk of leakage. In addition, the control assembly 3 and the brake assembly 4 of this structure are compact and low in cost. Furthermore, as the valve opens, the valve structure moves away from the bottom of the brake piston 41, and the oil pressure in the brake chamber gradually decreases as the valve structure moves away from the brake piston, so that the control chamber spring can overcome the brake chamber spring and the residual oil pressure, and push open the plugging member so that the brake fluid flows back from the communication port to the oil drain port of the solenoid valve.

[0053] The blocking member 33 may be a blocking plate or a blocking block, etc. Optionally, the blocking member 33 is a blocking ball, which has a small fluid resistance and is convenient for controlling the movement of the blocking member 33 .

[0054] On the basis of the above embodiment, a separation block may be provided in the brake chamber 112 by interference fit, the separation block is provided between the control chamber 111 and the brake chamber 112 , and the communication channel 113 is provided on the separation block.

[0055] As an alternative, Figure 7 and Fig. 9 As shown, the control chamber 111 also includes a threaded connection chamber 115 arranged between the control chamber 111 and the brake chamber 112; the control component 3 also includes: an adjusting screw 35, including an upper part, a middle part and a lower part connected in sequence; at least part of the upper part is located in the control chamber 111, the middle part is connected to the threaded connection chamber 115, and the lower part is located in the brake chamber 112; a control inner chamber 351 is provided on the adjusting screw 35, a connecting channel 113 is arranged at the lower part of the adjusting screw 35 and connected to the control inner chamber 351, and the control chamber spring 32 and the control piston 31 are located in the control inner chamber 351; a flow port 352 connecting the control chamber 111 and the control inner chamber 351 is provided at the upper part; and a limit member is connected between the lower part and the brake piston 41.

[0056] In this embodiment, the adjusting screw 35 is matched with the threaded connection chamber 115 to realize the connection between the adjusting screw 35 and the brake installation chamber 11. The control chamber spring 32 and the control piston 31 are located in the control inner chamber 351, that is, the control chamber spring 32 and the control piston 31 are located in the adjusting screw 35. The control chamber spring 32 and the control piston 31 can be pre-assembled with the adjusting screw 35 before being installed in the brake installation chamber 11, which is convenient for installation. The position of the adjusting screw 35 in the brake installation chamber 11 can be appropriately adjusted through the threaded connection chamber 115 between the adjusting screw 35 and the threaded connection chamber 115. The brake fluid enters the communication channel 113 from the second flow channel 14 through the flow port 352.

[0057] Optionally, the top and bottom of the brake installation cavity 11 are both opened, that is, a through hole is set on the bracket 1 to form the installation cavity. The diameter of the control cavity 111 is larger than the diameter of the threaded connection cavity 115, and the diameter of the brake cavity 112 is larger than the diameter of the threaded connection cavity 115, so as to facilitate the installation of the control component 3 and the brake component 4.

[0058] Alternatively, if Figure 7 He Ru Fig. 9 As shown, the top opening of the upper part is provided, and a pressure relief screw plug 36 is provided at the opening. Specifically, a pressure relief hole is provided inside the pressure relief screw plug 36, and the brake fluid at the top of the brake piston is released by the pressure relief hole as the brake piston moves up and down in the control chamber, preventing the control piston from losing the control function.

[0059] Specifically, one end of the control chamber spring 32 is connected to the bottom of the pressure relief plug 36, and the other end is connected to the control piston 31. The control piston 31 includes a large diameter section and a small diameter section connected to each other, and the large diameter section is provided with a receiving groove. At least part of the control chamber spring 32 is located in the receiving chamber, and one end of the small diameter section away from the large diameter section extends into the communication channel 113. Such an arrangement can make the structure in the brake installation chamber 11 more compact.

[0060] The deflation brake further comprises a locking nut 5 , which is fixed on the bracket 1 . A portion of the upper portion of the adjusting screw 35 extends out of the control chamber 111 and is tightened in the locking nut 5 .

[0061] like Figure 7 and Fig. 9 As shown, based on the above embodiment, further, an annular groove 353 is provided on the upper part, and the flow port 352 is arranged at the bottom of the annular groove 353 .

[0062] In this embodiment, an annular groove 353 is provided on the upper portion to accommodate more brake fluid, so that the brake fluid can enter the control inner cavity 351 faster.

[0063] As an optional solution, a plurality of flow openings 352 are provided at intervals at the bottom of the annular groove 353 along the circumferential direction of the annular groove 353 , so that the brake fluid can enter the control cavity 351 more quickly, and then enter the brake cavity 112 through the connecting channel 113 .

[0064] On the basis of the above embodiment, further, the stopper may be a stopper block installed at the bottom of the brake chamber 112, and a matching block is correspondingly arranged on the brake piston 41. When the matching block contacts the stopper block, the brake piston 41 cannot continue to move downward. The bottom of the control piston 31 can prevent the brake piston 41 from continuing to move upward.

[0065] As an alternative, Figure 7 and Fig. 9 As shown, the limiting member is a limiting clamping spring 42; an annular protrusion is provided at the bottom of the lower part, and the limiting clamping spring 42 can contact the protrusion. This limiting member has a simple structure and is easy to install.

[0066] like Figure 7 and Fig. 9 As shown, based on the above embodiment, further, an annular mounting groove is provided on the outer wall of the brake piston 41 ; a brake retaining spring 44 and a sealing ring 43 are installed in the mounting groove, and the retaining spring is located on the inner side of the sealing ring 43 .

[0067] In this embodiment, the brake clamping spring 44 can press the sealing ring 43 against the inner wall of the brake chamber 112 , thereby improving the sealing performance between the brake piston 41 and the brake chamber 112 .

[0068] like Figures 1 to 3 As shown, based on the above embodiment, the bracket 1 further includes: a first arm 15, a valve mounting chamber 12 is arranged in the first arm 15; a first flow channel 13 is arranged in the first arm 15; a second arm 16 is connected to the first arm 15; along the length direction of the second arm 16, a plurality of brake mounting chambers 11 are arranged on the second arm 16; and a second flow channel 14 is arranged in the second arm 16.

[0069] The electric control valve 2 can be fixed on the bracket 1 by the clamping plate 6 and the fastener 7. Specifically, the clamping plate 6 is connected to the electric control valve 2, and the clamping plate 6 is fixed on the bracket 1 by the fastener 7.

[0070] It is understandable that, for the convenience of processing, both the first flow channel 13 and the second flow channel 14 can be set through the bracket 1, and a plug 8 can be installed on the bracket 1 to block the opening of the first flow channel 13 and the opening of the second flow channel 14.

[0071] An embodiment of the utility model further provides a vehicle, comprising an engine and an air-deflation brake of any of the above-mentioned technical solutions, so that the vehicle has all the beneficial technical effects of the air-deflation brake, which will not be described in detail herein.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them; although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model. In the description provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification. In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments instead of other features, the combination of features of different embodiments means being within the scope of the utility model and forming different embodiments.

Claims

1. A deflation brake, characterized in that: include: A bracket, wherein a brake installation cavity, a valve installation cavity, a first flow channel, a second flow channel and a leakage channel are provided on the bracket; the upper part of the brake installation cavity forms a control cavity, the lower part of the brake installation cavity forms a brake cavity, and the control cavity and the brake cavity are connected; An electric control valve is installed in the valve installation cavity; the electric control valve comprises an inlet, an outlet and a drain port, the first flow channel is used to connect the inlet with the outside, the second flow channel connects the outlet with the control cavity, and the drain channel is used to connect the drain port with the outside; A control component, disposed in the control chamber to control the opening and closing state of the communication passage between the control chamber and the brake chamber; The brake assembly is slidably arranged in the brake cavity and is used for contacting the valve structure.

2. The run-flat brake according to claim 1, characterized in that: The control components include: A control piston, slidably disposed in the control chamber; A control chamber spring connected between the control chamber and the control piston; a communication port communicating with the brake chamber is provided at the bottom of the communication channel; A blocking member is located in the brake chamber; in a non-braking state, the control piston contacts the blocking member, and the blocking member is away from the communication port; in a braking state, the control piston is separated from the blocking member, and the blocking member blocks the communication port; A brake chamber spring, located in the brake chamber, one end of which is connected to the blocking member; The brake components include: A brake piston slides along the brake chamber, and the other end of the brake chamber spring is connected to the brake piston; A limiting member is arranged in the brake chamber and connected to the brake piston.

3. The run-flat brake according to claim 2, characterized in that: The control chamber further comprises a threaded connection chamber disposed between the control chamber and the brake chamber; The control components also include: An adjusting screw comprises an upper portion, a middle portion and a lower portion which are connected in sequence; at least a part of the upper portion is located in the control chamber, the middle portion is connected to the threaded connection chamber, and the lower portion is located in the brake chamber; a control inner chamber is provided on the adjusting screw, the connecting passage is arranged at the lower portion of the adjusting screw and is connected to the control inner chamber, the control chamber spring and the control piston are located in the control inner chamber; a flow port connecting the control chamber and the control inner chamber is provided at the upper portion; the limiting member is connected between the lower portion and the brake piston.

4. The run-flat brake according to claim 3, characterized in that: The limiting member is a limiting clamp spring; An annular protrusion is provided at the bottom of the lower part, and the limiting clamping spring can contact the protrusion.

5. The run-flat brake according to claim 3, characterized in that: The top of the upper part is provided with an opening, and a pressure relief screw plug is provided at the opening.

6. The run-flat brake according to claim 3, characterized in that: An annular groove is arranged on the upper part, and the flow port is arranged at the bottom of the annular groove.

7. The run-flat brake according to claim 3, characterized in that: The top of the brake piston is provided with a brake inner cavity, and the lower portion is located in the brake inner cavity; The blocking member and the brake chamber spring are located in the brake inner chamber.

8. The run-flat brake according to any one of claims 1 to 7, characterized in that: An annular mounting groove is provided on the outer wall of the brake piston; The mounting groove is provided with a brake clamping spring and a sealing ring, and the brake clamping spring is located on the inner side of the sealing ring.

9. The run-flat brake according to claim 1, characterized in that: The support comprises: A first support arm, wherein the valve installation cavity is arranged on the first support arm; and the first flow channel is arranged on the first support arm; The second support arm is connected to the first support arm; a plurality of the brake mounting cavities are arranged on the second support arm along the length direction of the second support arm; and the second flow channel is arranged on the second support arm.

10. A vehicle, characterized in that: include: An engine and a run-flat brake as claimed in any one of claims 1 to 9, wherein the bracket is mounted on the engine.

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