Braking system, running assembly and transport vehicle

Abstract

The embodiment of the present application relates to a kind of brake system, walking assembly and transport vehicle, brake system includes caliper mechanism, mechanical drive mechanism and pneumatic drive mechanism, caliper mechanism includes mounting bracket and piston, mounting bracket is equipped with movable cavity, piston is movably arranged in movable cavity, to at least part of structure extends movable cavity;Mechanical drive mechanism is installed in mounting bracket and is transmission connection with piston, piston moves relative to mounting bracket under the drive of mechanical drive mechanism;Pneumatic drive mechanism is communicated with movable cavity, and pneumatic drive mechanism is used to fill air or air extraction in movable cavity, to with mechanical drive mechanism jointly drive piston relative to mounting bracket moves.Under the setting of the embodiment, the mechanical drive mechanism of smaller specification can meet the requirement of driving piston, facilitate the combination of mechanical drive mechanism and caliper mechanism, facilitate the combination of brake system and transport vehicle.

Description

Technical Field

[0001] This application relates to the field of vehicle braking technology, and in particular to a braking system, a running gear assembly, and a transport vehicle. Background Technology

[0002] The braking performance of a vehicle has a significant impact on its safety performance. With the development of vehicle technology, the braking system of a vehicle has made great progress. The braking system generally includes a caliper and a drive mechanism. The drive mechanism is used to drive the caliper to clamp the brake disc and adjust the clamping force of the caliper. There are many types of drive mechanisms, such as hydraulic drive mechanisms and electric motor drive mechanisms.

[0003] To meet braking requirements, existing vehicles generally use drive mechanisms with higher output power, but these higher-specification drive mechanisms are not easy to install. Utility Model Content

[0004] This application provides a braking system, a walking assembly, and a transport vehicle, aiming to solve the problem that traditional braking systems require the use of high-specification motors, which leads to installation difficulties.

[0005] In a first aspect, embodiments of this application provide a braking system, which includes a caliper mechanism, a mechanical drive mechanism, and a pneumatic drive mechanism. The caliper mechanism includes a mounting bracket and a piston. The mounting bracket has a movable cavity, and the piston is movably disposed in the movable cavity, extending at least partially out of the movable cavity. The mechanical drive mechanism is mounted on the mounting bracket and is drively connected to the piston. The piston moves relative to the mounting bracket under the drive of the mechanical drive mechanism. The pneumatic drive mechanism communicates with the movable cavity and is used to inflate or depress air into the movable cavity to jointly drive the piston to move relative to the mounting bracket with the mechanical drive mechanism.

[0006] In some optional embodiments, the mechanical drive mechanism includes a drive component and a transmission assembly. The drive component is mounted on a mounting bracket, and the transmission assembly is disposed in the movable cavity. The transmission assembly is connected to the drive component in a transmission manner, and the drive component drives the piston to move through the transmission assembly.

[0007] In some optional embodiments, the transmission assembly includes a lead screw and a transmission nut, the lead screw being connected to a drive member and the transmission nut being rotatably mounted on the lead screw; the piston is provided with an insert groove, at least a portion of the shaft of the lead screw extends into the insert groove, and at least a portion of the structure of the transmission nut is inserted into the insert groove and contacts the piston.

[0008] In some optional embodiments, the lead screw is provided with a first threaded groove, and the transmission nut is provided with a second threaded groove; the transmission assembly also includes a plurality of rolling balls, which are respectively located between the lead screw and the transmission nut, with the portion of each rolling ball facing the lead screw embedded in the first threaded groove and the portion of each rolling ball facing the nut embedded in the second threaded groove.

[0009] In some optional embodiments, the braking system further includes an air spring adapted to be installed between the vehicle frame and the axle; a pneumatic drive mechanism is connected to the air spring and is used to inflate or de-inflate the air spring.

[0010] In some optional embodiments, the pneumatic drive mechanism includes an air storage mechanism and a control valve; one end of the control valve is connected to the air storage mechanism, and the other end of the control valve is connected to the movable chamber and the air spring respectively.

[0011] In some optional embodiments, the active cavity has an opening, through which at least a portion of the piston structure extends to the outside of the active cavity; the mounting bracket is provided with a flow through-hole located on the side of the active cavity away from the opening, the active cavity communicating with the outside through the flow through-hole, and the flow through-hole communicating with a pneumatic drive mechanism.

[0012] In some optional embodiments, the braking system further includes a control device electrically connected to both the mechanical drive mechanism and the pneumatic drive mechanism. The control device is configured to control the mechanical drive mechanism to drive the piston movement according to external signals, and to control the pneumatic drive mechanism to inflate or de-inflate the movable chamber. The external signals include at least one of the following signals: pedal travel signal, emergency braking signal, brake release signal, parking signal, and parking release signal.

[0013] Secondly, this application provides a travel assembly, which includes an axle, a plurality of rotating wheels, a brake disc, and the braking system mentioned above. The plurality of rotating wheels are respectively mounted on the axle; at least one rotating wheel is mounted with a brake disc; a caliper mechanism corresponds to the brake disc and is used to clamp the brake disc.

[0014] Thirdly, this application provides a transport vehicle, which includes a frame and the aforementioned running gear assembly, with the frame mounted on the running gear assembly.

[0015] This embodiment provides a braking system including a caliper mechanism, a mechanical drive mechanism, and a pneumatic drive mechanism. The caliper mechanism includes a mounting bracket and a piston. The mounting bracket has a movable cavity, and the piston is movably mounted in the movable cavity, with at least a portion of the piston's structure extending out of the movable cavity. In this embodiment, the mechanical drive mechanism is mounted on the mounting bracket and is drively connected to the piston. The pneumatic drive mechanism communicates with the movable cavity and can inflate the movable cavity. The mechanical drive mechanism and the pneumatic drive mechanism can jointly drive the piston to move relative to the mounting bracket, with at least a portion of its structure extending out of the movable cavity.

[0016] In this embodiment, the force acting on the piston is provided jointly by a pneumatic drive mechanism and a mechanical drive mechanism. The mechanical drive mechanism does not need to provide the entire force driving the piston, and a smaller mechanical drive mechanism can be selected. A smaller mechanical drive mechanism is smaller in size, lighter in weight, and lower in cost. In this embodiment, the pneumatic drive mechanism is fully utilized, reducing the output power required by the mechanical drive mechanism. This allows the smaller mechanical drive mechanism to meet the requirements of driving the piston, facilitating its installation on the caliper mechanism. This results in a smaller and lighter braking system, making it easier to install on the transport vehicle and reducing the production cost of the transport vehicle. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the transport vehicle provided in the embodiments of this application.

[0019] Figure 2 yes Figure 1 The diagram shows the structural design of the vehicle frame of the transport vehicle.

[0020] Figure 3 This is a schematic diagram of the walking assembly provided in the embodiments of this application.

[0021] Figure 4 This is a schematic diagram of the braking system provided in the embodiments of this application.

[0022] Figure 5 yes Figure 4 The diagram shows the structure of the caliper mechanism and the pneumatic drive mechanism working together.

[0023] Figure 6 yes Figure 4 The diagram shows the structural schematic of the transmission component of the mechanical drive mechanism.

[0024] Figure 7 yes Figure 1 The control flowchart shown illustrates the control device receiving the pedal travel signal.

[0025] Figure 8 yes Figure 1 The control flowchart shown illustrates the control device receiving emergency braking signals.

[0026] Figure 9 yes Figure 1The control flowchart shown illustrates the control device receiving the brake release signal.

[0027] Figure 10 yes Figure 1 The control flowchart shown is for the control device to receive the parking signal.

[0028] Reference numerals: 1000, Transport vehicle; 900, Frame; 800, Running gear assembly; 810, Axle; 820, Rotating wheel; 830, Brake disc; 100, Braking system; 10, Caliper mechanism; 11, Mounting bracket; 111, First mounting part; 1111, Movable cavity; 1113, Flow through hole; 112, Second mounting part; 12, Piston; 121, Insert groove; 13, Friction plate; 20, Mechanical drive mechanism; 21, Drive component; 22, Transmission assembly; 221, Lead screw; 2211, First threaded groove; 222, Transmission nut; 2221, Second threaded groove; 223, Ball bearing; 30, Pneumatic drive mechanism; 31, Air storage mechanism; 32, Control valve; 40, Control device; 50, Air spring. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0030] Please see Figure 1 This application provides a braking system 100, a running gear assembly 800 configured with the braking system 100, and a transport vehicle 1000 configured with the running gear assembly 800. In this embodiment, the transport vehicle 1000 is a means of transportation or passenger transport. The transport vehicle 1000 in this embodiment includes a vehicle, such as a car or a truck. In this embodiment, the transport vehicle 1000 includes a frame 900, which is the main structure of the transport vehicle 1000. The frame 900 constructs the appearance of the transport vehicle 1000 and defines the internal space. For example, the frame 900 can define spaces such as a passenger compartment and a cargo compartment, and can also define other spaces for installing structures such as starting devices (e.g., generators, batteries). In this embodiment, the frame 900 includes a sheet metal structure, which defines spaces such as the passenger compartment and the cargo compartment.

[0031] Please see Figure 2 and Figure 3In this embodiment, the transport vehicle 1000 further includes a running gear assembly 800, which is the main actuator enabling the transport vehicle 1000 to travel on the road surface. The frame 900 is mounted on the running gear assembly 800 to move on the road surface. Specifically, the running gear assembly 800 in this embodiment includes an axle 810, which is mounted on the side of the frame 900 facing the road surface. The axle 810 is equipped with multiple rotating wheels 820, which are rotatably mounted at both ends of the axle 810. The multiple rotating wheels 820 are located on the left and right sides of the frame 900 in the direction of travel. In this embodiment, the number of rotating wheels 820 corresponding to each axle 810 can be two, four, etc., and can be specifically set according to the type and total mass of the vehicle. In this embodiment, the running gear assembly 800 may include a plurality of axles 810, each axle 810 being equipped with at least two rotating wheels 820. The plurality of axles 810 are sequentially and spaced apart on the frame 900 along the vehicle's travel direction to stably support the frame 900.

[0032] In this embodiment, the running gear assembly 800 further includes a brake disc 830 and a braking system 100. At least one of the plurality of rotating wheels 820 mentioned above is equipped with a brake disc 830. The brake disc 830 can be fixedly connected to the hub of the rotating wheel 820 and rotates with the rotating wheel 820. In this embodiment, the braking system 100 is used to clamp the brake disc 830 to reduce the rotational speed of the brake disc 830 and the rotating wheel 820, thereby reducing the travel speed of the transport vehicle 1000. In this embodiment, the running gear assembly 800 includes two axles 810. Each axle 810 has a rotating wheel 820 installed at each end. Each rotating wheel 820 is equipped with a brake disc 830. Each brake disc 830 cooperates with the braking system 100. Under the clamping action of the braking system 100, the speed of each brake disc 830 and the rotating wheel 820 is reduced, thereby reducing the travel speed of the transport vehicle 1000. In some other embodiments, the number of axles 810 and the number of brake discs 830 can be specifically set according to actual conditions.

[0033] Please see Figure 3 and Figure 4In this embodiment, the braking system 100 includes a caliper mechanism 10, and each brake disc 830 is equipped with a caliper mechanism 10. Specifically, the axle 810 includes a steering knuckle (not shown in the figure), a rotating wheel 820 is rotatably mounted on the steering knuckle, and the caliper mechanism 10 is fixedly mounted on the steering knuckle. The caliper mechanism 10 is used to clamp the brake disc 830. The caliper mechanism 10 includes a mounting bracket 11 and a piston 12. The mounting bracket 11 has a movable cavity 1111, and the piston 12 is movably disposed in the movable cavity 1111. In this embodiment, the mounting bracket 11 includes a first mounting portion 111 and a second mounting portion 112 connected to each other. The first mounting portion 111 has a movable cavity 1111, and at least a portion of the structure of the second mounting portion 112 is spaced apart from the opening of the movable cavity 1111 (not shown in the figure). The brake disc 830 is located between the second mounting portion 112 and the first mounting portion 111. In this embodiment, the caliper mechanism 10 further includes two friction plates 13. One friction plate 13 is mounted on the end of the piston 12 facing the second mounting portion 112, and the other friction plate 13 is mounted on the side of the second mounting portion 112 facing the movable cavity 1111. The two friction plates 13 are arranged at a distance from each other. In actual application scenarios, the brake disc 830 is located between the two friction plates 13. The piston 12 is movably mounted in the movable cavity 1111. The piston 12 can drive the friction plates 13 on it to move towards the second mounting portion 112. At least a part of the structure of the piston 12 can extend out of the movable cavity 1111. During this process, the distance between the two friction plates 13 gradually decreases, and the two friction plates 13 can successively abut against the opposite sides of the brake disc 830 to reduce the rotational speed of the brake disc 830.

[0034] In this embodiment, the braking system 100 includes a mechanical drive mechanism 20 and a pneumatic drive mechanism 30. The mechanical drive mechanism 20 and the pneumatic drive mechanism 30 jointly drive the piston 12 and the friction plate 13 to move toward the direction of the second mounting portion 112. Specifically, in this embodiment, the mechanical drive mechanism 20 refers to a mechanism or device that drives the target object to move through contact. The mechanical drive mechanism 20 is mounted on the mounting bracket 11. The mechanical drive mechanism 20 can be mounted on the side of the first mounting portion 111 away from the movable cavity 1111. The mechanical drive mechanism 20 is connected to the piston 12 in the movable cavity 1111. Under the drive of the mechanical drive mechanism 20, the piston 12 can move toward the direction of the second mounting portion 112 or has a tendency to move toward the direction of the second mounting portion 112.

[0035] Please see Figure 5In this embodiment, the pneumatic drive mechanism 30 can inflate or depress air into the enclosed space. The pneumatic drive mechanism 30 is generally used to inflate or depress air into the air spring 50 to adjust the attitude of the frame 900 so that the attitude of the frame 900 conforms to the calibrated attitude. The details of the air spring 50 will be explained later and will not be elaborated upon here. In this embodiment, the pneumatic drive mechanism 30 is also used to drive the piston 12.

[0036] Specifically, in this embodiment, the piston 12 and the movable cavity 1111 are sealed together, for example, by a rubber sealing ring or an alloy sealing ring. In this embodiment, the pneumatic drive mechanism 30 communicates with the movable cavity 1111 to pressurize or depress the movable cavity 1111, allowing the piston 12 to move within the movable cavity 1111 or to have a tendency to move. In this embodiment, when the pneumatic drive mechanism 30 pressurizes the movable cavity 1111, the piston 12 moves toward the second mounting portion 112 or has a tendency to move toward the second mounting portion 112. In this embodiment, the mechanical drive mechanism 20 and the pneumatic control device 40 jointly drive the piston 12 to move toward the second mounting portion 112.

[0037] In summary, this embodiment provides a braking system 100, which includes a caliper mechanism 10, a mechanical drive mechanism 20, and a pneumatic drive mechanism 30. The caliper mechanism 10 includes a mounting bracket 11 and a piston 12. The mounting bracket 11 has a movable cavity 1111, and the piston 12 is movably mounted in the movable cavity 1111. At least a portion of the piston 12 can extend out of the movable cavity 1111. In this embodiment, the mechanical drive mechanism 20 is mounted on the mounting bracket 11 and is drively connected to the piston 12. The pneumatic drive mechanism 30 communicates with the movable cavity 1111 and can inflate the movable cavity 1111. The mechanical drive mechanism 20 and the pneumatic drive mechanism 30 can jointly drive the piston 12 to move relative to the mounting bracket 11, with at least a portion of its structure extending out of the movable cavity 1111. In this embodiment, the brake disc 830 is located on one side of the opening of the movable cavity 1111 and is spaced apart from the opening. Under the joint drive of the mechanical drive mechanism 20 and the pneumatic drive mechanism 30, the piston 12 moves relative to the mounting bracket 11 toward the brake disc 830, and the friction plate 13 on the piston 12 contacts the brake disc 830 to limit the rotation of the brake disc 830 and the rotating wheel 820, thereby reducing the rotational speed of the brake disc 830 and the rotating wheel 820 and reducing the travel speed of the transport vehicle 1000.

[0038] In this embodiment, the force on piston 12 is provided jointly by pneumatic drive mechanism 30 and mechanical drive mechanism 20. Mechanical drive mechanism 20 does not need to provide all the force to drive piston 12. Mechanical drive mechanism 20 can be selected with a smaller size. The volume, weight, cost and other related characteristics of mechanical drive mechanism 20 are related to its size. The smaller the size, the smaller the volume, the lighter the weight and the lower the cost of mechanical drive mechanism 20. Under the setting of this embodiment, the pneumatic drive mechanism 30 is fully utilized to reduce the output power required by mechanical drive mechanism 20, so that the smaller mechanical drive mechanism 20 can meet the requirements of driving piston 12. The smaller mechanical drive mechanism 20 has a smaller volume and lighter weight, which makes it easier to install mechanical drive mechanism 20 on caliper mechanism 10. This makes the braking system 100 smaller in size and lighter in weight, which makes it easier to install braking system 100 on running gear 800 (steering knuckle). The lower cost of mechanical drive mechanism 20 can reduce the production cost of transport vehicle 1000.

[0039] It should be noted that the specifications of different types of mechanical drive mechanisms 20 have different meanings. As an example, if the mechanical drive mechanism 20 is a motor-driven mechanical drive mechanism 20, then its specifications include rated voltage, rated current, rated power, motor size, etc. As another example, if the mechanical drive motor is a hydraulic rod-type mechanical drive mechanism 20, then its specifications include the diameter and stroke (axial length) of the push rod, as well as the volume, inner diameter, and wall thickness of the cylinder.

[0040] Please see Figure 4 and Figure 6 In this embodiment, the mechanical drive mechanism 20 includes a drive member 21 and a transmission assembly 22. The drive member 21 is mounted on the mounting bracket 11. The transmission assembly 22 and the piston 12 are both disposed in the movable cavity 1111. The transmission assembly 22 is located between the drive member 21 and the piston 12, and is drively connected to the drive member 21. At least a portion of the structure of the transmission assembly 22 can contact the piston 12 to achieve transmission. In practical applications, the drive member 21 operates and drives at least a portion of the structure of the transmission assembly 22 to move toward the brake disc 830. The transmission assembly 22 can push the piston 12 toward the brake disc 830 or cause the piston 12 to have a tendency to move toward the brake disc 830. In this embodiment, the transmission component 22 is disposed in the movable cavity 1111 to occupy part of the space of the movable cavity 1111, thereby reducing the space in the movable cavity 1111 that can be filled with air. When the pneumatic drive mechanism 30 fills the movable cavity 1111 with less gas, it can drive the piston 12 to move, thereby improving the sensitivity of the pneumatic drive mechanism 30 to the driving action of the piston 12.

[0041] In this embodiment, the transmission assembly 22 includes a lead screw 221 and a transmission nut 222. The lead screw 221 is drive-connected to the drive member 21, and the transmission nut 222 is rotatably mounted on the lead screw 221. In this embodiment, the drive member 21 includes a motor, such as a geared motor or a stepper motor. The output shaft of the motor is drive-connected to the lead screw 221, and the motor is mounted on the side of the first mounting portion 111 opposite to the opening of the movable cavity 1111. As an example, the output shaft of the motor can pass through the first mounting portion 111 and extend into the movable cavity 1111 to be drive-connected to the lead screw 221. As another example, the end of the lead screw 221 can pass through the first mounting portion 111 and extend into the side of the first mounting portion 111 opposite to the opening of the movable cavity 1111 to be drive-connected to the output shaft of the motor. As another example, the mechanical drive mechanism 20 also includes a coupling located between the lead screw 221 and the motor. The coupling passes through the first mounting portion 111 and is drive-connected to both the lead screw 221 and the motor.

[0042] In practical applications, the motor drives the lead screw 221 to rotate, and the transmission nut 222 moves relative to the lead screw 221 towards the brake disc 830. The transmission nut 222 contacts the piston 12 and pushes the piston 12 towards the brake disc 830. In this embodiment, transmission is achieved through the lead screw 221 and the transmission nut 222, resulting in a relatively stable driving effect, low energy loss, and high driving accuracy. In other embodiments, the mechanical drive mechanism 20 may include a hydraulic rod, etc.

[0043] In this embodiment, the piston 12 has a columnar structure. One end of the piston 12 facing the lead screw 221 is recessed with an embedding groove 121, which extends along the axial direction of the piston 12. In this embodiment, the columnar piston 12 increases the contact area between the piston 12 and the inner wall of the movable groove, making the movement of the piston 12 more stable. The embedding groove 121 reduces the material used in the piston 12, lowering its weight and cost. In this embodiment, a portion of the lead screw 221 extends into the embedding groove 121, and at least a portion of the transmission nut 222 is embedded in the embedding groove 121 and contacts the piston 12. In this embodiment, by providing the embedding groove 121, the internal space of the movable cavity 1111 is fully utilized. While ensuring a large contact area between the piston 12 and the inner wall of the movable cavity 1111, the volume of the movable cavity 1111 and the mounting bracket 11 are smaller, resulting in a smaller caliper mechanism 10 and a lighter braking system 100.

[0044] Please see Figure 6In this embodiment, the lead screw 221 is provided with a first threaded groove 2211, and the transmission nut 222 is provided with a second threaded groove 2221. When the transmission nut 222 is installed on the lead screw 221, the first threaded groove 2211 and the second threaded groove 2221 are arranged at intervals relative to each other. In this embodiment, the transmission assembly 22 also includes a plurality of rolling balls 223, which are distributed between the lead screw 221 and the transmission nut 222. The portion of each rolling ball 223 facing the lead screw 221 is embedded in the first threaded groove 2211, and the rolling ball 223 rolls relative to the inner wall of the first threaded groove 2211. The portion of each rolling ball 223 facing the transmission nut 222 is embedded in the second threaded groove 2221, and the rolling ball 223 rolls relative to the inner wall of the second threaded groove 2221. In this embodiment, the transmission component 22 is a ball screw 221. The friction between the components of the transmission component 22 is small, which can avoid the high temperature of the transmission component 22 and the caliper mechanism 10, reduce the loss of mechanical energy, and make the transmission efficiency of the transmission component 22 high.

[0045] Please see Figure 5 In this embodiment, the braking system 100 also includes an air spring 50, which is installed between the frame 900 and the axle 810. The air spring 50 supports the frame 900 and adjusts its posture. Specifically, in this embodiment, the pneumatic drive mechanism 30 is connected to the air spring 50. When the pneumatic drive mechanism 30 inflates the air spring 50, the air spring 50 expands to push the frame 900 away from the road surface. When the pneumatic drive mechanism 30 deflates the air spring 50 (or the air spring 50 directly deflates to the external environment), the air spring 50 contracts to lower the height of the frame 900. In this embodiment, an air spring 50 is installed on one side of each rotating wheel 820 to adjust the height of the frame 900 in multiple positions, such as the front, front left, front right, rear, rear left, and rear right, thereby adjusting the posture of the frame 900. When the transport vehicle 1000 is under emergency braking, the front of the frame 900 tends to tilt forward and move towards the road surface. The pneumatic drive mechanism 30 can inflate the air spring 50 to raise the front of the frame 900, thereby preventing the front of the frame 900 from colliding with the road surface, road curbs, speed bumps, or other structures, and improving the safety performance of the transport vehicle 1000.

[0046] In this embodiment, the pneumatic drive mechanism 30 includes an air storage mechanism 31 and a control valve 32. One end of the control valve 32 is connected between the air storage mechanism 31 and the movable chamber 1111, and the other end is connected to the movable chamber 1111 and the air spring 50 respectively. In actual application scenarios, the control valve 32 is configured to connect the air storage mechanism 31 and the movable chamber 1111, and the air storage mechanism 31 and the air spring 50 respectively, according to the instructions of the control device 40. With the configuration of this embodiment, the piston 12 can be driven by the air storage device, which can reduce the specifications of the mechanical drive mechanism 20 and reduce the volume and weight of the mechanical drive mechanism 20 and the braking system 100. In this embodiment, the air storage mechanism 31 may include equipment such as a cylinder and an air pump.

[0047] Please see Figure 4 In this embodiment, the mounting bracket 11 is provided with a flow through hole 1113. The flow through hole 1113 and the opening of the movable cavity 1111 are respectively located at both ends of the movable cavity 1111, with the flow through hole 1113 located on the side of the movable cavity 1111 away from the opening. In this embodiment, the movable cavity 1111 has a bottom wall opposite to the opening, and the flow through hole 1113 is located between the bottom wall and the piston 12. The movement trajectory of the piston 12 does not pass through the flow through hole 1113, thus avoiding the piston 12 blocking the flow through hole 1113.

[0048] Please see Figure 1In this embodiment, the braking system 100 further includes a control device 40, which is electrically connected to the mechanical drive mechanism 20 and the pneumatic drive mechanism 30 respectively. The control device 40 is configured to control the mechanical drive mechanism 20 to drive the piston 12 to move according to external signals, and to control the pneumatic drive mechanism 30 to inflate or de-inflate the movable chamber 1111. In this embodiment, the control device 40 may include one of the following control units: Vehicle Control Unit (VCU), Zone Control Unit (ZCU), Central Control Unit (CCU), etc. Different types of control devices 40 have different control ranges. In this embodiment, the stiffness value of the air spring 50 is related to factors such as the rotational speed of the rotating wheel 820 and the deceleration of the transport vehicle 1000. A lookup table can be established based on the stiffness value of the air spring 50, the rotational speed of the rotating wheel 820, and the deceleration of the transport vehicle 1000. The control device 40 can determine the stiffness value of the air spring 50 based on the rotational speed of the rotating wheel 820, the deceleration of the transport vehicle 1000, and the lookup table. The control device 40 determines the stiffness value of the air spring 50 through the lookup table and controls the control valve 32 to inflate or depressurize the air spring 50 by the air storage mechanism 31, or to connect the air spring 50 to the external environment, thereby adjusting the pressure and stiffness value of the air spring 50 and adjusting the attitude of the vehicle frame 900. In some embodiments, the air spring 50 has an integrated controller, which works with the control valve 32 to autonomously adjust the stiffness value of the air spring 50. When the attitude of the vehicle frame 900 conforms to the calibrated attitude, the adjustment of the air spring 50 is stopped.

[0049] Please see Figure 7 In this embodiment, the external signal includes a pedal travel signal, which characterizes the magnitude of the brake pedal's travel relative to its initial state when the user depresses the brake pedal. As an example, if the user depresses the brake pedal and maintains a constant pedal travel, it indicates that the user wants to decelerate at the current deceleration rate. Based on this external signal, the control device 40 controls the control valve 32 to close the passage between the air storage device and the active chamber 1111, so that the force exerted by the caliper mechanism 10 on the brake disc 830 remains unchanged.

[0050] As another example, when a user presses the brake pedal and increases the pedal travel, it indicates that the user wants to reduce the speed of the transport vehicle 1000 more quickly. The control device 40 controls the control valve 32 to connect the passage between the air storage device and the active chamber 1111 according to the external signal, and controls the air storage mechanism 31 to inflate the active chamber 1111 to increase the force of the caliper mechanism 10 on the brake disc 830. In some embodiments, the control device 40 can also control the mechanical drive mechanism 20 to increase the force on the piston 12.

[0051] As another example, when a user presses the brake pedal and keeps the pedal travel short, it indicates that the user wants to slow down the decrease in the speed of the transport vehicle 1000. The control device 40 controls the control valve 32 to connect the passage between the air storage device and the active chamber 1111 according to the external signal, and controls the air storage mechanism 31 to extract air to reduce the force of the caliper mechanism 10 on the brake disc 830. In some other embodiments, the control device 40 connects the active chamber 1111 to the external environment through the control valve 32 to reduce the air pressure in the active chamber 1111, so as to reduce the force of the caliper mechanism 10 on the brake disc 830. In some other embodiments, the control device 40 can also control the mechanical drive mechanism 20 to reduce the force on the piston 12.

[0052] Please see Figure 8 In this embodiment, the external signal may include an emergency braking signal, which may be provided by a central control unit or an emergency braking system 100 (Automatic Emergency Braking, AEB), indicating that the user has an emergency braking need. In this embodiment, the brake pedal has a travel sensor that detects the pedal travel. The travel sensor is electrically connected to the control device 40. When the signal from the travel sensor indicates a rapid increase in the brake pedal travel, it also indicates that the user has an emergency braking need. In this embodiment, when the control device 40 receives an emergency braking signal or a signal indicating a rapid increase in the brake pedal travel, the control device 40 controls the braking system 100 to perform emergency braking.

[0053] Specifically, in this embodiment, the control device 40 controls the control valve 32 to connect the passage between the air storage device and the active chamber 1111 according to the external signal, and controls the air storage mechanism 31 to inflate the active chamber 1111 to increase the force of the caliper mechanism 10 on the brake disc 830. In some embodiments, the control device 40 can also control the mechanical drive mechanism 20 to increase the force on the piston 12.

[0054] Please see Figure 9In this embodiment, the external signal may include a brake release signal, which may be provided by the central control unit, the Automatic Emergency Braking (AEB) system 100, a stroke sensor, etc. The brake release signal indicates that the user wants to stop the braking system 100 from braking the brake disc 830. Specifically, in this embodiment, the control device 40 controls the control valve 32 to connect the passage between the air storage device and the active chamber 1111 according to the external signal, and controls the air storage mechanism 31 to draw air into the active chamber 1111 to reduce the force exerted by the caliper mechanism 10 on the brake disc 830. In some other embodiments, the control device 40 connects the active chamber 1111 to the external environment through the control valve 32 to reduce the air pressure in the active chamber 1111, thereby reducing the force exerted by the caliper mechanism 10 on the brake disc 830. In some other embodiments, the control device 40 may also control the mechanical drive mechanism 20 to reduce the force exerted on the piston 12.

[0055] Please see Figure 10 In this embodiment, the external signal may include a parking signal, which may be provided by the central control unit or the emergency braking system 100 (Automatic Emergency Braking, AEB), indicating that the user wants to park the transport vehicle 1000 on the road or ramp. Specifically, in this embodiment, the control device 40 controls the control valve 32 to connect the passage between the air storage device and the movable chamber 1111 according to the external signal, and controls the air storage mechanism 31 to inflate the movable chamber 1111 to increase the force exerted by the caliper mechanism 10 on the brake disc 830. In some other embodiments, the control device 40 may also control the mechanical drive mechanism 20 to increase the force exerted on the piston 12.

[0056] In this embodiment, the pneumatic drive mechanism 30 may include a pressure sensor (not shown in the figure), which is electrically connected to the control device 40. In this embodiment, the pressure sensor may be integrated into the movable cavity 1111 or disposed on the pipeline between the control valve 32 and the bracket of the movable cavity 1111. The pressure sensor is used to detect the pressure within the movable cavity 1111. In this embodiment, the movable cavity 1111 has a parking air pressure value. When the pressure sensor detects that the pressure within the movable cavity 1111 reaches the parking air pressure value, the control device 40 controls the control valve 32 to close the passage between the air storage device and the movable cavity 1111.

[0057] In this embodiment, the external signal may include a parking release signal, which may be provided by the central control unit or the Automatic Emergency Braking (AEB) system 100. The parking release signal indicates that the user wants to release the braking system 100 from the brake disc 830 and prepare to start the vehicle. Specifically, in this embodiment, the control device 40 controls the control valve 32 to connect the passage between the air storage device and the active chamber 1111 according to the external signal, and controls the air storage mechanism 31 to draw air into the active chamber 1111 to reduce the force exerted by the caliper mechanism 10 on the brake disc 830. In some other embodiments, the control device 40 connects the active chamber 1111 to the external environment through the control valve 32 to reduce the air pressure in the active chamber 1111, thereby reducing the force exerted by the caliper mechanism 10 on the brake disc 830. In some other embodiments, the control device 40 may also control the mechanical drive mechanism 20 to reduce the force exerted on the piston 12.

[0058] In this embodiment, the mechanical drive mechanism 20 may further include a pressure sensor (not shown in the figure), which is disposed on the transmission assembly 22 and is used to detect the pressure exerted by the transmission assembly 22 on the piston 12. In this embodiment, the control device 40 may be electrically connected to both the pressure sensor and the pneumatic pressure sensor to receive their signals respectively. In this embodiment, the force exerted by the mechanical drive mechanism 20 on the piston 12 may have multiple predetermined pressure values ​​to correspond to different degrees of driving effect of the mechanical drive mechanism 20 on the piston 12. In this embodiment, the air pressure in the movable chamber 1111 may have multiple predetermined air pressure values ​​to correspond to different degrees of driving effect of the pneumatic drive mechanism on the piston 12. In this embodiment, different degrees of braking effect of the braking system 100 on the brake disc 830 may correspond to different predetermined pressure values ​​and predetermined air pressure values. Under the settings of this embodiment, it is possible to determine whether the braking system 100 has achieved the preset braking effect through multiple signals or data, resulting in a more accurate judgment.

[0059] This embodiment provides a braking system 100, which includes a caliper mechanism 10, a mechanical drive mechanism 20, and a pneumatic drive mechanism 30. The caliper mechanism 10 includes a mounting bracket 11 and a piston 12. The mounting bracket 11 has a movable cavity 1111, and the piston 12 is movably mounted in the movable cavity 1111. At least a portion of the piston 12 can extend out of the movable cavity 1111. In this embodiment, the mechanical drive mechanism 20 is mounted on the mounting bracket 11 and is drively connected to the piston 12. The pneumatic drive mechanism 30 communicates with the movable cavity 1111 and can inflate the movable cavity 1111. The mechanical drive mechanism 20 and the pneumatic drive mechanism 30 can jointly drive the piston 12 to move relative to the mounting bracket 11, with at least a portion of its structure extending out of the movable cavity 1111.

[0060] In this embodiment, the force on the piston 12 is provided jointly by the pneumatic drive mechanism 30 and the mechanical drive mechanism 20. The mechanical drive mechanism 20 does not need to provide all the force to drive the piston 12. The mechanical drive mechanism 20 can be of a smaller size, which results in a smaller volume, lighter weight, and lower cost. In this embodiment, the pneumatic drive mechanism 30 is fully utilized, reducing the output power required by the mechanical drive mechanism 20. This allows the smaller mechanical drive mechanism 20 to meet the requirements of driving the piston 12, facilitating its installation on the caliper mechanism 10. Consequently, the braking system 100 is smaller in size, making it easier to install on the travel assembly 800. The lighter weight and smaller size of the braking system 100 reduce the production cost of the transport vehicle 1000.

[0061] In this application specification, if certain terms are used to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. For example, the term "comprising" used throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem within a certain margin of error and basically achieve the technical effect.

[0062] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application 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. Therefore, they should not be construed as limitations on this application.

[0063] In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or merely surface contact. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A braking system, characterized in that, include: A caliper mechanism, the caliper mechanism including a mounting bracket and a piston, the mounting bracket having a movable cavity, the piston being movably disposed in the movable cavity and extending at least partially out of the movable cavity; A mechanical drive mechanism is mounted on the mounting bracket and is connected to the piston via a transmission connection. The piston moves relative to the mounting bracket under the drive of the mechanical drive mechanism. as well as A pneumatic drive mechanism is provided, which is connected to the movable cavity. The pneumatic drive mechanism is used to inflate or depress the movable cavity to drive the piston relative to the mounting bracket together with the mechanical drive mechanism.

2. The braking system as described in claim 1, characterized in that, The mechanical drive mechanism includes a drive component and a transmission assembly. The drive component is mounted on the mounting bracket, and the transmission assembly is disposed in the movable cavity. The transmission assembly is connected to the drive component in a transmission manner, and the drive component drives the piston to move through the transmission assembly.

3. The braking system as described in claim 2, characterized in that, The transmission assembly includes a lead screw and a transmission nut, the lead screw being connected to the driving component, and the transmission nut being rotatably mounted on the lead screw; The piston is provided with an insert groove, at least a portion of the shaft of the lead screw extends into the insert groove, and at least a portion of the structure of the drive nut is inserted into the insert groove and contacts the piston.

4. The braking system as described in claim 3, characterized in that, The lead screw is provided with a first threaded groove, and the transmission nut is provided with a second threaded groove; The transmission assembly also includes a plurality of ball bearings, which are respectively located between the lead screw and the transmission nut. The portion of each ball bearing facing the lead screw is embedded in the first threaded groove, and the portion of each ball bearing facing the nut is embedded in the second threaded groove.

5. The braking system as claimed in claim 1, characterized in that, The braking system also includes an air spring adapted to be installed between the vehicle frame and the axle; The pneumatic drive mechanism is connected to the air spring, and the pneumatic drive mechanism is used to inflate or de-inflate the air spring.

6. The braking system as described in claim 5, characterized in that, The pneumatic drive mechanism includes an air storage mechanism and a control valve; One end of the control valve is connected to the gas storage mechanism, and the other end of the control valve is connected to the movable chamber and the air spring respectively.

7. The braking system according to any one of claims 1 to 6, characterized in that, The movable chamber has an opening, and at least a portion of the piston's structure extends through the opening to the outside of the movable chamber; The mounting bracket is provided with a flow through hole, which is located on the side of the movable cavity away from the opening. The movable cavity is connected to the outside through the flow through hole, and the flow through hole is connected to the pneumatic drive mechanism.

8. The braking system according to any one of claims 1 to 6, characterized in that, The braking system also includes a control device, which is electrically connected to the mechanical drive mechanism and the pneumatic drive mechanism respectively. The control device is configured to control the mechanical drive mechanism to drive the piston movement according to an external signal, and to control the pneumatic drive mechanism to inflate or de-inflate the movable chamber. The external signals include at least one of the following signals: pedal travel signal, emergency braking signal, brake release signal, parking signal, and parking release signal.

9. A walking assembly, characterized in that, include: Axles and brake discs; Multiple rotating wheels are respectively mounted on the axle, and at least one of the rotating wheels is mounted with the brake disc; as well as The braking system according to any one of claims 1 to 8, wherein the caliper mechanism corresponds to the brake disc and the caliper mechanism is used to clamp the brake disc.

10. A transport vehicle, characterized in that, include: Frame; as well as The chassis is mounted on the running gear assembly as claimed in claim 9.

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