Emergency vacuum booster braking system and commercial vehicle vacuum booster braking system

Abstract

The invention discloses an emergency vacuum booster brake system and a commercial vehicle vacuum booster brake system, and relates to the field of commercial vehicle vacuum booster brake systems. One end of the first vacuum pipe is connected to the mechanical vacuum pump, the other end of the first vacuum pipe is used for being connected with a vacuum booster, and a first one-way valve for preventing gas from flowing back to the vacuum booster is arranged on the first vacuum pipe; and the vacuum pump opening and closing device is configured to enable a vehicle axle to serve as a power source to be connected with the mechanical vacuum pump when the vacuum degree of the brake vacuum tank is lower than a preset value so as to drive the mechanical vacuum pump to exhaust air from the vacuum booster. The mechanical vacuum pump is driven by mechanical kinetic energy of the vehicle axle to exhaust air from the vacuum booster, extra braking capacity is provided for the vehicle, an original electric vacuum pump is assisted to provide braking capacity for the vehicle, and the problem that in the prior art, a new energy commercial vehicle is only provided with one set of electric vacuum pump, and potential safety hazards exist under the emergency condition is solved.

Description

Technical Field

[0001] The invention relates to the field of vacuum booster braking systems for commercial vehicles, and in particular to an emergency vacuum booster braking system and a vacuum booster braking system for commercial vehicles. Background Art

[0002] At present, new energy commercial vehicles are usually equipped with hydraulic brake vacuum booster systems to meet the braking needs of new energy commercial vehicles. The hydraulic brake vacuum booster system includes a brake pedal, a vacuum booster, a brake master cylinder, a brake vacuum tank, an electric vacuum pump, and a power supply. When the vehicle is powered on, the electric vacuum pump turns on and pumps air into the brake vacuum tank, increasing the vacuum in the brake vacuum tank and the vacuum booster pipeline system; when the user steps on the brake pedal, the vacuum in the brake vacuum tank and the pipeline is consumed and drives the brake master cylinder to brake the vehicle.

[0003] In actual use, when the vehicle brakes continuously in an emergency situation, the vacuum in the brake vacuum tank will be consumed rapidly. When the electric vacuum pump's suction capacity is less than the vacuum consumption rate in the vacuum booster, the vacuum in the vacuum booster will decrease rapidly, resulting in insufficient brake vacuum boosting capacity, making the brake pedal hard, and the vehicle cannot effectively decelerate, leading to an accident. The vehicle is only equipped with one hydraulic brake vacuum boosting system. When the electric vacuum pump or the hydraulic brake vacuum boosting system fails or the electric vacuum pump loses power, the remaining braking capacity of the vehicle is insufficient to cope with emergencies, and ultimately an accident occurs due to insufficient braking force.

[0004] Therefore, new energy commercial vehicles are only equipped with a solution that uses an electric vacuum pump to provide braking assistance, which poses certain safety hazards in the above-mentioned emergency situations. Summary of the invention

[0005] The present application provides an emergency vacuum assisted braking system and a commercial vehicle vacuum assisted braking system, which can solve the technical problem in the prior art that new energy commercial vehicles are only equipped with one set of electric vacuum pumps, which poses a safety hazard in an emergency.

[0006] In a first aspect, an embodiment of the present application provides an emergency vacuum booster braking system, which includes:

[0007] Mechanical vacuum pump;

[0008] a first vacuum tube, one end of which is connected to the mechanical vacuum pump, and the other end of which is used to connect to a vacuum booster, and the first vacuum tube is provided with a first one-way valve to prevent gas from flowing back to the vacuum booster;

[0009] A vacuum pump opening and closing device is configured to: when the vacuum degree of the brake vacuum tank is lower than a preset value, the vehicle axle is used as a power source to connect the mechanical vacuum pump to drive the mechanical vacuum pump to evacuate the vacuum booster.

[0010] In combination with the first aspect, in one implementation, the vacuum pump opening and closing device includes:

[0011] a pneumatic clutch located between the vehicle axle and the mechanical vacuum pump;

[0012] A second vacuum tube has one end connected to the pneumatic clutch and the other end used to connect to the brake vacuum tank. The second vacuum tube is provided with a second one-way valve to prevent gas from flowing back to the brake vacuum tank.

[0013] In combination with the first aspect, in one embodiment, the system further comprises a power transmission shaft, one end of the power transmission shaft is connected to the pneumatic clutch, and the other end of the power transmission shaft is used to connect to a vehicle axle.

[0014] In combination with the first aspect, in one embodiment, the system further comprises a power transmission shaft, one end of the power transmission shaft is used to connect to or disconnect from the pneumatic clutch, and the other end of the power transmission shaft is used to connect to a vehicle axle;

[0015] The pneumatic clutch is arranged on the mechanical vacuum pump.

[0016] In combination with the first aspect, in one implementation, the power transmission shaft is a power transmission shaft on a car.

[0017] In combination with the first aspect, in one implementation, the power transmission shaft is a power transmission shaft newly added in the system.

[0018] In combination with the first aspect, in one embodiment, a vacuum pneumatic speed regulator is further provided at one end of the power transmission shaft close to the pneumatic clutch.

[0019] In combination with the first aspect, in one implementation, the vacuum pump opening and closing device includes:

[0020] A vacuum sensor, wherein the vacuum sensor is arranged on the brake vacuum tank and is used to detect the vacuum degree of the brake vacuum tank;

[0021] An opening and closing mechanism, the opening and closing mechanism is connected to the mechanical vacuum pump and is used to drive the mechanical vacuum pump to be disconnected from or connected to the vehicle axle;

[0022] A controller is connected to the vacuum sensor and the opening and closing mechanism. A vacuum threshold is preset in the controller and the controller is used to receive the detected vacuum. When the vacuum is lower than the vacuum threshold, the opening and closing mechanism is controlled to drive the mechanical vacuum pump to connect to the vehicle axle.

[0023] In a second aspect, an embodiment of the present application provides a commercial vehicle vacuum booster braking system, which includes:

[0024] An emergency vacuum assisted braking system as claimed in any one of claims 1 to 8.

[0025] In conjunction with the second aspect, in one embodiment, a commercial vehicle vacuum booster braking system further includes:

[0026] A vacuum booster, to which a third vacuum pipe, a third one-way valve, a brake vacuum tank and an electric vacuum pump are sequentially connected, and the third one-way valve is used to prevent gas from flowing back to the vacuum booster;

[0027] The first vacuum tube is connected to the third vacuum tube, and the first vacuum tube is arranged between the vacuum booster and the third one-way valve.

[0028] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0029] By additionally connecting a mechanical vacuum pump to the vacuum booster, an additional emergency vacuum booster braking system is provided for new energy commercial vehicles. In conjunction with the vacuum pump opening and closing device, when the vacuum degree in the brake vacuum tank is lower than a preset value during vehicle driving, the vacuum pump opening and closing device connects the vehicle axle to the mechanical vacuum pump, so that the mechanical vacuum pump is driven by the mechanical kinetic energy of the vehicle axle to evacuate the vacuum booster, thereby providing additional braking capacity for the vehicle, assisting the original electric vacuum pump in providing braking capacity for the vehicle, and because the mechanical vacuum pump is provided with a mechanical power source by the vehicle axle, even if the vehicle is in a power-off state, the mechanical vacuum pump can still provide additional braking capacity for the vehicle, thereby solving the problem in the prior art that new energy commercial vehicles are only equipped with one electric vacuum pump and thus pose a safety hazard in an emergency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of a vacuum-assisted braking system for a commercial vehicle in this application;

[0032] In the figure: 1. Mechanical vacuum pump; 11. First vacuum tube; 12. First non-return valve; 2. Pneumatic clutch; 21. Second vacuum tube; 211. Second non-return valve; 3. Power transmission shaft; 31. Vacuum air pressure governor; 32. Vehicle axle; 4. Vacuum booster; 41. Brake pedal; 42. Master brake cylinder; 43. Brake vacuum tank; 431. Third vacuum tube; 432. Third non-return valve; 433. Vacuum sensor; 44. Electric vacuum pump; 45. Fourth vacuum tube; 451. Fourth non-return valve; 5. Power supply. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] The embodiments of the present application provide an emergency vacuum assisted braking system and a commercial vehicle vacuum assisted braking system, which can solve the problem in the prior art that new energy commercial vehicles are only equipped with one set of electric vacuum pumps, which poses a safety hazard in emergency situations.

[0035] Reference Figure 1 A schematic diagram of a vacuum assisted braking system for a commercial vehicle in the present application, an emergency vacuum assisted braking system and a vacuum assisted braking system for a commercial vehicle disclosed in the present application, the embodiment of the present application is described in a state where the vacuum assisted braking system for a commercial vehicle has been installed in a commercial vehicle, wherein the vacuum assisted braking system for a commercial vehicle includes an electric vacuum pumping braking system and an emergency vacuum assisted braking system, the electric vacuum pumping braking system is used to provide conventional braking capacity for the vehicle, the emergency vacuum assisted braking system is provided with a mechanical power source by the vehicle axle 32 of the vehicle, and is started when the braking capacity provided by the electric vacuum brake system for the vehicle is insufficient to stop the vehicle, and the auxiliary electric vacuum pump 44 provides additional braking capacity for the vehicle.

[0036] The electric vacuum brake system includes a vacuum booster 4, a brake vacuum tank 43, an electric vacuum pump 44 and a power supply 5 connected in sequence. The vacuum booster 4 is provided with a brake pedal 41 and a brake master cylinder 42. The vacuum booster 4 is connected to the brake vacuum tank 43 through a third vacuum pipe 431. The third vacuum pipe 431 is provided with a third one-way valve 432. The third one-way valve 432 can prevent the gas in the third vacuum pipe 431 from flowing back into the vacuum booster 4 to prevent the gas from flowing back into the brake vacuum tank 43 during braking. The electric vacuum pump 44 is connected to the brake vacuum tank 43 through a fourth vacuum pipe 45. The fourth one-way valve 451 is provided on the fourth vacuum pipe 45. The fourth one-way valve 451 can prevent the gas in the fourth vacuum pipe 45 from flowing back into the brake vacuum tank 43. The electric vacuum pump 44 is electrically connected to the power supply 5, and the power supply 5 is used to power on the electric vacuum pump 44, so that the electric vacuum pump 44 draws air toward the brake vacuum tank 43.

[0037] When the vehicle needs to brake, the user presses the brake pedal 41. When the brake pedal 41 is pressed down, the power supply 5 is turned on, and the electric vacuum pump 44 draws air toward the brake vacuum tank 43 to reduce the air pressure in the brake vacuum tank 43 and increase the vacuum degree, thereby causing the brake vacuum tank 43 to draw air toward the vacuum booster 4, driving the master brake cylinder 42 to provide braking capability for the vehicle.

[0038] The emergency vacuum booster brake system includes a mechanical vacuum pump 1, a first vacuum tube 11 and a vacuum pump opening and closing device. The two ends of the first vacuum tube 11 are respectively connected to the mechanical vacuum pump 1 and the vacuum booster 4, so that the mechanical vacuum pump 1 can directly pump air toward the vacuum booster 4. A first one-way valve 12 is provided on the first vacuum tube 11, and the first one-way valve 12 is used to prevent the gas in the first vacuum tube 11 from flowing back into the vacuum booster 4. When the vacuum degree in the brake vacuum tank 43 is lower than the preset value, the vacuum pump opening and closing device can connect the vehicle axle 32 with the mechanical vacuum pump 1. At this time, since the vehicle has not stopped, the vehicle axle 32 is still rotating. The rotation of the vehicle axle 32 provides mechanical kinetic energy for the mechanical vacuum pump 1, thereby driving the mechanical vacuum pump 1 to pump air to the vacuum booster 4, thereby providing additional braking capacity for the vehicle. The problem that the new energy commercial vehicle is only equipped with one set of electric vacuum pumps 44 in the prior art, which poses a safety hazard in an emergency, is solved.

[0039] Furthermore, the first vacuum tube 11 is connected to the third vacuum tube 431, and the connection between the first vacuum tube 11 and the third vacuum tube 431 is located between the vacuum booster 4 and the third one-way valve 432. This connection method makes the emergency vacuum booster braking system and the electric vacuum brake system not interfere with each other, and the mechanical vacuum pump 1 is only turned on or off by the vacuum degree in the brake vacuum tank 43. Of course, the first vacuum tube 11 can also be set as a separate pipeline, not connected to the third vacuum tube 431, and directly connected to the vacuum booster 4.

[0040] Embodiment 1:

[0041] As an embodiment of the present application, the vacuum pump opening and closing device in the emergency vacuum booster brake system includes a pneumatic clutch 2 and a second vacuum tube 21, the two ends of the second vacuum tube 21 are respectively connected to the pneumatic clutch 2 and the brake vacuum tank 43, and the second vacuum tube 21 is also provided with a second one-way valve 211 for preventing the gas in the second vacuum tube 21 from flowing back into the brake vacuum tank 43. The second vacuum tube 21 serves as a bridge connecting the pneumatic clutch 2 and the brake vacuum tank 43. Its design not only ensures the high efficiency of gas flow, but also effectively prevents the occurrence of gas backflow through the built-in second one-way valve 211. The second one-way valve 211 allows gas to flow from the pneumatic clutch 2 side to the brake vacuum tank 43 to supplement or maintain the vacuum in the brake vacuum tank 43, but strictly prevents gas from flowing back from the brake vacuum tank 43 to the pneumatic clutch 2, thereby avoiding possible efficiency loss and a decrease in the vacuum of the brake vacuum tank 43. The pneumatic clutch 2 is located between the vehicle axle 32 and the mechanical vacuum pump 1. The pneumatic clutch 2 has a preset air pressure threshold to facilitate power transmission and to adjust the opening state of the mechanical vacuum pump 1 in real time according to the vehicle driving state.

[0042] The pneumatic clutch 2, also known as the pneumatic clutch, transmits power by pushing the friction component with air pressure, and performs "separation" and "connection" states by the return spring. As a specific embodiment of the present application, the air pressure threshold of the pneumatic clutch 2 can be set to the atmospheric pressure. When the electric vacuum brake system is in a normal working state, the vacuum degree of the brake vacuum tank 43 is consumed and the air is first drawn into the vacuum booster 4. The air pressure in the pneumatic clutch 2 is in a state of balance with the atmospheric pressure, so that the connection between the vehicle axle 32 and the mechanical vacuum pump 1 is disconnected, and the emergency vacuum boost system is not started. When the vehicle is in an emergency situation, such as when continuous braking is required, or the electric vacuum brake system has an abnormal cycle and cannot provide sufficient braking capacity, the vacuum in the brake vacuum tank 43 is rapidly consumed and air is pumped toward the pneumatic clutch 2. At this time, the air pressure in the pneumatic clutch 2 is affected by the air pumping of the brake vacuum tank 43 and is less than the atmospheric pressure. At this time, the pneumatic clutch 2 is started and the mechanical vacuum pump 1 is connected to the vehicle axle 32. At this time, since the vehicle has not stopped, the vehicle axle 32 can drive the mechanical vacuum pump 1 to pump air toward the vacuum booster 4 during the rotation process, quickly replenishing the vacuum in the brake vacuum tank 43, so as to assist the electric vacuum brake system in providing braking capacity for the vehicle while ensuring the immediate response and stability of the brake boosting system.

[0043] The pneumatic clutch 2 is connected to the vehicle axle 32 via a power transmission shaft 3. As an embodiment of the present application, the two ends of the power transmission shaft 3 are respectively connected to the pneumatic clutch 2 and the vehicle axle 32 to serve as a medium for power transmission of the vehicle axle 32. When the air pressure value in the pneumatic clutch 2 changes, the friction plate or piston mechanism inside the pneumatic clutch 2 will act accordingly to achieve connection with the mechanical vacuum pump 1, so that the vehicle axle 32 provides mechanical kinetic energy for the mechanical vacuum pump 1, thereby replenishing the required vacuum degree for the brake vacuum tank 43, ensuring timely response of the brake booster.

[0044] In another embodiment of the present application, the pneumatic clutch 2 can also be arranged on the mechanical vacuum pump 1, the power transmission shaft 3 is arranged on the vehicle axle 32, and the end of the power transmission shaft 3 away from the vehicle axle 32 is used to connect or disconnect with the pneumatic clutch 2. In this configuration, when the air pressure inside the pneumatic clutch 2 remains stable, that is, the electric vacuum brake system works normally and provides sufficient braking capacity for the vehicle, the power transmission shaft 3 and the pneumatic clutch 2 remain separated, avoiding unnecessary energy loss and mechanical wear; when the air pressure in the pneumatic clutch 2 changes with the vacuum degree in the brake vacuum tank 43, the power transmission shaft 3 is connected to the pneumatic clutch 2, and drives the mechanical vacuum pump 1 to start working, providing the necessary vacuum degree supplement for the brake vacuum tank 43. Of course, no matter which embodiment, the setting of the pneumatic clutch 2 ensures that the mechanical vacuum pump 1 can be flexibly started and stopped according to the actual demand of the vehicle for braking capacity, which not only improves the energy efficiency of the emergency vacuum booster brake system, but also enhances the response speed and reliability of the emergency vacuum booster brake system. At the same time, by optimizing the layout and connection method of the power transmission shaft 3, the efficiency and stability of power transmission are further improved, providing a solid guarantee for the safe driving of the vehicle.

[0045] More specifically, in the early design process, the power transmission shaft 3 can be a power transmission shaft 3 set on the vehicle axle 32. The advantage of this setting is that it can maximize the use of the original mechanical structure of the vehicle and avoid the additional manufacturing and installation costs of the power transmission shaft 3. By adapting and connecting the pneumatic clutch 2 to the existing power transmission shaft 3 of the vehicle, it can be ensured that the power is effectively transmitted from the vehicle axle 32 to the pneumatic clutch 2 without significantly increasing the overall weight of the vehicle. In addition, because there is no need to redesign the transmission path or install additional brackets and fixtures, using the original power transmission shaft of the vehicle can also reduce the complexity of the integration of the emergency vacuum booster brake system. This design not only simplifies the production process, but also improves the reliability and durability of the system.

[0046] Similarly, in order to more flexibly adapt to the connection requirements between the pneumatic clutch 2 and the vehicle axle 32, or to improve the independence and response speed of the emergency vacuum brake system, the power transmission shaft 3 can also be a newly added power transmission shaft 3 in the emergency vacuum brake system. This independently designed power transmission shaft 3 can have a more optimized geometry and material selection to better meet the requirements of the emergency vacuum booster brake system for power transmission efficiency, reliability and durability. For example, it may be made of high-strength alloy materials, such as steel. Steel, as a typical metal material, has become one of the preferred backup materials for the power transmission shaft 3 due to its excellent mechanical properties. Steel not only has extremely high tensile strength and compressive strength, and can still maintain structural integrity under extreme conditions, but also has good plasticity and toughness, and can absorb and disperse a large amount of energy, thereby effectively resisting impact and vibration. In addition, the weldability and processability of steel are also excellent, which is convenient for precise cutting, bending and connection according to actual needs to meet the design requirements of various complex structures. Of course, in addition to steel, there are other metal materials that can also be used to manufacture the power transmission shaft 3, such as aluminum alloy, titanium alloy, etc. Although aluminum alloy is slightly inferior to steel in strength, it has low density and light weight, which is very beneficial for application scenarios that need to reduce the overall weight. Titanium alloy is known for its high strength, low density and good corrosion resistance. At the same time, the length, diameter and cross-sectional shape of the power transmission shaft 3 can be customized according to specific connection requirements to achieve optimal energy transfer efficiency. In addition, the newly added power transmission shaft 3 can also be designed as a structure that is easy to install and maintain, such as adopting a modular design or a quick connection interface, so that it can be quickly replaced or repaired when necessary. This design not only improves the maintainability of the emergency vacuum booster braking system, but also reduces long-term operating costs.

[0047] In actual design, the choice of which power transmission shaft 3 solution needs to take into account multiple factors, including cost-effectiveness, system integration complexity, system performance requirements, and the overall layout of the vehicle. In some cases, it may be necessary to combine the advantages of the two solutions. For example, on the basis of retaining the original power transmission shaft in the design, an auxiliary transmission path is added to improve the flexibility and reliability of the emergency vacuum booster braking system. In short, whether using the original power transmission shaft 3 of the vehicle or designing a completely new power transmission shaft 3, it is necessary to ensure the power transmission performance while taking into account cost-effectiveness and the convenience of system integration. Through reasonable planning and design, an efficient and economical emergency vacuum braking system can be constructed to provide a strong guarantee for the safe driving of the vehicle.

[0048] Furthermore, a vacuum air pressure governor 31 is also provided at one end of the power transmission shaft 3 facing the pneumatic clutch 2, a transmission belt is connected to one end of the power transmission shaft 3 away from the vehicle axle 32, and a vacuum air pressure governor 31 is connected to one end of the transmission belt away from the power transmission shaft 3. After the pneumatic clutch 2 is connected to the vacuum air pressure governor 31, the vacuum air pressure governor 31 can adjust the rotation speed and thus adjust the suction speed of the mechanical vacuum pump 1 according to the vacuum condition in the pneumatic clutch 2, that is, the vacuum degree in the brake vacuum tank 43. When the vacuum degree in the brake vacuum tank 43 is large, the vacuum degree in the pneumatic clutch 2 is reduced. At this time, the vacuum air pressure governor 31 increases the suction rate of the mechanical vacuum pump 1, and the greater the vacuum degree in the brake vacuum tank 43, that is, the smaller the vacuum degree in the pneumatic clutch 2, the faster the vacuum air pressure governor 31 controls the suction rate of the mechanical vacuum pump 1, so as to provide sufficient braking capacity to the vehicle faster.

[0049] The pneumatic clutch 2 in the embodiment of the present application can automatically open or close the mechanical vacuum pump 1 according to the consumption of the vacuum degree in the brake vacuum tank 43, and use the dynamic potential energy of the vehicle axle 32 itself to provide mechanical kinetic energy for the mechanical vacuum pump 1. There is no need to provide an additional power source for the mechanical vacuum pump 1. When the vehicle is continuously braking in an emergency, or the electric vacuum pump 44 or the hydraulic brake vacuum booster system is damaged or the electric vacuum pump 44 is powered off, the mechanical vacuum pump 1 can be opened in time and provide additional braking capacity for the vehicle. Through the pneumatic clutch 2, the system realizes precise control of the mechanical vacuum pump 1. In the case of emergency braking or system failure, the pneumatic clutch 2 can control the mechanical vacuum pump 1 to open in time to provide additional braking protection for the vehicle and improve driving safety; and, due to the reduced dependence on external power sources, the system has lower maintenance costs, is more convenient and effectively reduces energy consumption, helps reduce carbon emissions, and is in line with the environmental protection trend of the modern automobile industry.

[0050] Embodiment 2:

[0051] As another embodiment of the present application, the vacuum pump opening and closing device includes an opening and closing mechanism, a vacuum sensor 433 and a controller. The opening and closing mechanism is connected to the mechanical vacuum pump 1 and is used to drive the mechanical vacuum pump 1 to disconnect or connect with the vehicle axle 32; the vacuum sensor 433 is arranged in the brake vacuum tank 43 to monitor the vacuum degree in the brake vacuum tank 43 in real time, and the vacuum sensor 433 is connected to the controller and transmits the vacuum degree in the brake vacuum tank 43 to the controller in real time. The high sensitivity and high precision of the vacuum sensor 433 ensure the accuracy of the data and provide reliable input information for the controller.

[0052] The controller is preset with a vacuum threshold. When the vacuum received by the controller is greater than the vacuum threshold, the air pressure in the brake vacuum tank 43 is relatively high, and the controller controls the opening and closing mechanism to open. The opening and closing mechanism connects the mechanical vacuum pump 1 to the vehicle axle 32, so that the mechanical vacuum pump 1 directly draws air toward the vacuum booster 4 to provide additional braking capacity for the vehicle. The controller can be connected to the control system of the vehicle itself, or it can be set in the vehicle as a separate control line. The specific installation method can be flexibly changed according to the actual vehicle design.

[0053] More specifically, the opening and closing mechanism specifically uses an electric closing switch, which can control the connection between the mechanical vacuum pump 1 and the power transmission shaft 3. When the vehicle is in normal driving, the electric closing switch is usually in a closed state, at which time the connection between the mechanical vacuum pump 1 and the power transmission shaft 3 is disconnected, and the mechanical vacuum pump 1 is in a standby state, consuming no additional energy. When the power supply system inside the vehicle is not damaged, the vehicle is still in a normal power supply state, but the vehicle encounters an emergency situation requiring continuous braking or the electric vacuum brake system provides insufficient braking capacity for the vehicle, the vacuum degree in the brake vacuum tank 43 is consumed at a very fast speed, and at this time the controller receives the vacuum degree in the brake vacuum tank 43 transmitted by the vacuum sensor 433, and the built-in intelligent algorithm of the controller can monitor the vacuum degree change in the brake vacuum tank 43 in real time. Once the vacuum degree is detected to be lower than the preset safety threshold, the opening instruction of the electric closing switch will be immediately triggered, so that the vehicle axle 32 is connected to the mechanical vacuum pump 1, and then the mechanical vacuum pump 1 is pumped toward the vacuum booster 4 to provide additional braking capacity for the vehicle.

[0054] In addition, it is worth noting that the electric closing switch is also designed with durability and reliability in mind. High-quality materials and advanced manufacturing processes are used inside to ensure good performance and stability during long-term use. At the same time, the electric closing switch also has self-diagnosis and fault protection functions. Once an abnormal situation is detected, it will immediately stop working and sound an alarm to avoid further damage to the vehicle's braking system.

[0055] The difference between Example 1 and Example 2 in this application is that in Example 1, the pneumatic clutch 2 is used as the core opening and closing device of the vacuum pump opening and closing device. Even if the vehicle is in a power-off state, the pneumatic clutch 2 can still work and connect the mechanical vacuum pump 1 and the vehicle axle 32, so that the emergency vacuum booster brake system can be started and provide additional braking capacity for the vehicle. In Example 2, the electric closing switch is selected as the core opening and closing device of the vacuum pump opening and closing device, which relies more on the vehicle's own power system. If the vehicle's power system is damaged and the vehicle is in a power-off state, the emergency vacuum booster brake system is also affected and cannot be started. However, when the vehicle power supply is in a normal state, compared with the pneumatic clutch 2 controlled by air pressure, the electric closing switch can obtain the most realistic real-time vacuum degree in the brake vacuum tank 43 through the vacuum degree sensor 433, and the data display is more accurate, so it can more timely supplement the braking capacity of the vehicle. The application scenarios of the two implementation methods are different. In actual use, they can be flexibly changed according to the actual focus of the vehicle design to better meet actual needs.

[0056] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0057] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0058] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An emergency vacuum booster brake system, characterized in that: It includes: Mechanical vacuum pump (1); a first vacuum tube (11), one end of the first vacuum tube (11) being connected to the mechanical vacuum pump (1), and the other end being used to connect to the vacuum booster (4), and the first vacuum tube (11) being provided with a first one-way valve (12) for preventing gas from flowing back to the vacuum booster (4); A vacuum pump opening and closing device, wherein the vacuum pump opening and closing device is configured to: when the vacuum degree of a brake vacuum tank (43) is lower than a preset value, enable the vehicle axle (32) to be connected to the mechanical vacuum pump (1) as a power source, so as to drive the mechanical vacuum pump (1) to evacuate the vacuum booster (4).

2. An emergency vacuum booster brake system according to claim 1, characterized in that: The vacuum pump opening and closing device comprises: A pneumatic clutch (2), the pneumatic clutch (2) being located between the vehicle axle (32) and the mechanical vacuum pump (1); A second vacuum tube (21) has one end connected to the pneumatic clutch (2) and the other end used to connect to the brake vacuum tank (43). The second vacuum tube (21) is provided with a second one-way valve (211) to prevent gas from flowing back to the brake vacuum tank (43).

3. An emergency vacuum booster brake system according to claim 2, characterized in that: The system further comprises a power transmission shaft (3), one end of which is connected to the pneumatic clutch (2) and the other end of which is used to connect to a vehicle axle (32).

4. The emergency vacuum booster brake system according to claim 2, characterized in that: The system further comprises a power transmission shaft (3), one end of the power transmission shaft (3) being used for connecting to or disconnecting from the pneumatic clutch (2), and the other end of the power transmission shaft (3) being used for connecting to a vehicle axle (32); The pneumatic clutch (2) is arranged on the mechanical vacuum pump (1).

5. An emergency vacuum booster brake system according to claim 3 or 4, characterized in that: The power transmission shaft (3) is a power transmission shaft (3) on a car.

6. An emergency vacuum booster brake system according to claim 3 or 4, characterized in that: The power transmission shaft (3) is a power transmission shaft (3) newly added in the system.

7. An emergency vacuum booster brake system according to claim 3 or 4, characterized in that: A vacuum air pressure speed regulator (31) is also provided at one end of the power transmission shaft (3) close to the air pressure clutch (2).

8. The emergency vacuum booster brake system according to claim 1, characterized in that: The vacuum pump opening and closing device comprises: A vacuum degree sensor (433), wherein the vacuum degree sensor (433) is arranged on the brake vacuum tank (43) and is used to detect the vacuum degree of the brake vacuum tank (43); an opening and closing mechanism, the opening and closing mechanism being connected to the mechanical vacuum pump (1) and used for driving the mechanical vacuum pump (1) to be disconnected from or connected to the vehicle axle (32); A controller is connected to the vacuum sensor (433) and the opening and closing mechanism, the controller is preset with a vacuum threshold value and is used to receive the detected vacuum degree, and when the vacuum degree is lower than the vacuum threshold value, the opening and closing mechanism is controlled to drive the mechanical vacuum pump (1) to communicate with the vehicle axle (32).

9. A vacuum booster brake system for commercial vehicles, characterized in that: It includes: An emergency vacuum assisted braking system as claimed in any one of claims 1 to 8.

10. The commercial vehicle vacuum booster brake system according to claim 9, characterized in that: It also includes: A vacuum booster (4), wherein the vacuum booster (4) is connected in sequence to a third vacuum pipe (431), a third one-way valve (432), a brake vacuum tank (43) and an electric vacuum pump (44), wherein the third one-way valve (432) is used to prevent gas from flowing back to the vacuum booster (4); The first vacuum tube (11) is connected to the third vacuum tube (431), and the first vacuum tube (11) is arranged between the vacuum booster (4) and the third one-way valve (432).

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