Brake device for trolley

Abstract

The utility model provides a braking device for a trolley. The braking device comprises a bottom support, a front wheel brake, a rear wheel brake, a driving mechanism, a front wheel pull wire, a rear wheel pull wire and a rotating rod. The rotating rod is rotationally connected to the bottom support through a rotating shaft, and the driving mechanism is installed on the bottom support and is in transmission connection with the rotating rod. One end of the front wheel stay wire is connected with a first part of the rotating rod, the first part is located on one side of the rotating shaft, the other end of the front wheel stay wire is connected with the front wheel brake, and the rotating rod rotates to drive the front wheel stay wire; one end of the rear wheel pull wire is connected with a second part of the rotating rod, the second part is located on the other side of the rotating shaft, the other end of the rear wheel pull wire is connected with the rear wheel brake, and the rotating rod rotates to drive the rear wheel pull wire. The braking device has a double-loop protection function through a simple linear structure, and braking of the trolley is achieved.

Description

Technical Field

[0001] This application relates to the field of vehicle braking. Specifically, it relates to a braking device for a vehicle. Background Technology

[0002] Currently, driverless cars need to move from their initial position to their destination on their own. During this process, the driverless cars will encounter various road conditions. For example, when they encounter obstacles, they need to stop or avoid them. At this time, the car's braking device needs to be activated to slow down or stop the car.

[0003] Current autonomous vehicles often employ hydraulic braking systems to achieve braking. A hydraulic braking system is a vehicle braking system that uses fluid pressure to transmit braking force. The rotational force of the eBooster (intelligent braking system) motor is converted into hydraulic pressure, which is then transmitted to the wheels through hydraulic lines and brakes to decelerate or stop the vehicle. However, this braking system is too expensive, and it is usually integrated with functions such as ABS (anti-lock braking system), ESC (anti-skid system), and energy recovery within the vehicle, resulting in excessively high manufacturing costs.

[0004] Therefore, there is an urgent need for a simple and low-cost braking device to provide braking function for cars. Utility Model Content

[0005] This application provides a braking device for a vehicle, which reduces the cost of vehicle braking devices. This application also provides a vehicle, which includes the aforementioned braking device.

[0006] This application provides a braking device for a car, comprising: a bottom bracket, a front wheel brake, a rear wheel brake, a drive mechanism, a front wheel cable, a rear wheel cable, and a rotating rod;

[0007] The rotating rod is rotatably connected to the bottom bracket via a rotating shaft. The driving mechanism is mounted on the bottom bracket and is connected to the rotating rod in a transmission manner. The driving mechanism is used to drive the rotating rod to rotate.

[0008] One end of the front wheel cable is connected to the first part of the rotating rod, which is located on one side of the rotating shaft. The other end of the front wheel cable is connected to the front wheel brake. The rotating rod drives the front wheel cable by rotating, thereby controlling the friction generated inside the front wheel brake to reduce the speed of the front wheel.

[0009] One end of the rear wheel cable is connected to the second part of the rotating rod, which is located on the other side of the rotating shaft. The other end of the rear wheel cable is connected to the rear wheel brake. The rotating rod drives the rear wheel cable by rotating, thereby controlling the friction generated inside the rear wheel brake to slow down the speed of the rear wheel.

[0010] Optionally, the drive mechanism includes a drive motor and a push rod mounted on the bottom bracket, wherein the drive motor is used to drive the push rod to move;

[0011] The push rod is connected to the rotating rod in a transmission manner, so as to drive the rotating rod to rotate under the drive of the drive motor.

[0012] Optionally, the front wheel cable is connected to the rotating rod via a balance block, the balance block comprising at least two block-shaped structures horizontally clamped above and below the front wheel cable to horizontally hold the front wheel cable and the rear wheel cable in a horizontal state.

[0013] Optionally, the first part of the rotating rod and the second part of the rotating rod are provided with a plurality of connecting holes, which are arranged at intervals along the length of the rotating rod, and are used to rotatably connect with the front wheel cable or the rear wheel cable.

[0014] Optionally, a connecting plate is provided between the front wheel cable and the rotating rod. One end of the connecting plate is connected to the connecting hole, and the other end is provided with at least one connecting part. Each front wheel cable is connected to one of the connecting parts. Each balance block is connected to the connecting plate through the connecting parts. The connecting plate is used to drive the front wheel cable to move when the rotating rod rotates.

[0015] Optionally, the front wheel cable includes a first front wheel cable and a second front wheel cable. The first front wheel cable is connected to one front wheel brake, and the second front wheel cable is connected to the other front wheel brake. The connecting plate has a T-shaped structure, and the horizontal portion of the connecting plate is provided with a first connecting part and a second connecting part, which are respectively located at both ends of the horizontal portion. The first front wheel cable is connected to the connecting plate through the first connecting part, and the second front wheel cable is connected to the connecting plate through the second connecting part.

[0016] Optionally, the number and position of the connecting holes are symmetrically distributed about the central axis of the rotating rod.

[0017] Optionally, the first and second portions of the rotating rod are of the same length to keep the rotating rod in a balanced state.

[0018] Optionally, the brake internally includes a return spring, brake shoes, and a brake drum, used to generate friction between the brake shoes and the brake drum when subjected to the tension force of the front wheel cable and the rear wheel cable, thereby reducing the rotational speed of the front and rear wheels.

[0019] When the force exerted by the front wheel cable and the rear wheel cable disappears, the return spring inside the brake causes the brake to return to its original position, thereby releasing the braking of the front and rear wheels.

[0020] This application also provides a vehicle, including wheels, a controller, and a braking device, wherein the braking device includes any of the above-described braking devices for a vehicle.

[0021] Optionally, the drive mechanism is electrically connected to the controller of the vehicle, and the controller is used to send a braking signal to the drive mechanism, the braking signal including braking force and braking time.

[0022] Compared with existing technologies, the braking device for a car provided in this application has the advantages of simple structure and low cost. The braking device drives a rotating rod to rotate around a pivot axis via a drive mechanism, which in turn tightens the cable. The cable is connected to the brake, and when the cable tightens, it triggers the braking process of the brake, thereby reducing the wheel speed. Furthermore, the two ends of the rotating rod are connected to the front wheel cable and the rear wheel cable, respectively. When the rotating rod rotates, the front and rear wheel cables tighten inward, controlling the brake to generate friction, thereby braking the front and rear wheels. Therefore, the braking device provided in this application can utilize a simple linear structure and has a dual-circuit protection function to achieve braking of the car. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the braking device for a car provided in the first embodiment of this application.

[0024] Figure 2 This is a partially enlarged structural diagram of part A of the braking device for a car provided in the first embodiment of this application.

[0025] Figure 3 This is a schematic diagram of the drive mechanism of the braking device for a car provided in the first embodiment of this application.

[0026] Figure 4 This is a schematic diagram of the structure of the vehicle provided in the second embodiment of this application.

[0027] Figure label:

[0028] 101: Bottom bracket; 102: Front wheel brake; 103: Rear wheel brake; 104: Drive mechanism; 106: Rear wheel cable; A: Local markings;

[0029] 105: Front wheel cable; 107: Rotating rod; 107-2: Rotating position of rotating rod; 108: Shaft; 109: Balance weight; 110: Connecting plate;

[0030] 1041: Drive motor; 1042: Push rod;

[0031] 400: Cart; 401: Wheels; 402: Controller; 403: Braking device. Detailed Implementation

[0032] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below. In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] 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.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In existing technologies, most autonomous vehicles employ a dual-circuit hydraulic braking system. This system uses two independent hydraulic lines to control the front axle (front wheels and axle) and rear axle (rear wheels and axle) of the vehicle, or to control any two wheels separately. Its advantage is that if one set of lines fails, the other set can still continue to provide braking, thereby improving the reliability of vehicle braking and driving safety.

[0036] An intelligent hydraulic braking system is available, consisting of main components such as an ebooster (intelligent braking system), hydraulic lines, and wheel-end brakes. Its working principle is as follows: when the unmanned vehicle's braking system operates without a driver, a braking command is issued via the autonomous driving system. Upon receiving the command, the ebooster pressurizes the hydraulic system through the rotation of its motor. The hydraulic system then transmits the pressure to the brakes on all four wheels through the braking lines, and the brakes complete the braking action.

[0037] Since the aforementioned hydraulic braking systems are often used in high-speed vehicles, i.e., autonomous vehicles with speeds exceeding 15 km / h, these systems often integrate anti-lock braking (ABS) and anti-skid functions to prevent unavoidable wheel lock-up and skidding during high-speed driving. The ABS automatically controls the braking force of the brakes to prevent wheel lock-up during braking and maintain a slip rate of approximately 20% during rolling, thus ensuring maximum adhesion between the wheels and the ground. The anti-skid function is typically used to prevent skidding or rollover during emergency maneuvers, emergency braking, or sharp turns. These braking systems are complex and costly. Applying such a braking system to vehicles with lower speeds and simpler scenarios would result in redundant functions and increased overall vehicle cost.

[0038] Therefore, for driverless vehicles, this application proposes a braking device with a simpler structure and lower cost to achieve a better braking effect. The braking device provided in this application embodiment can achieve a good braking effect on low-speed vehicles, typically with a speed of about 15 km / h. The number of wheels on the vehicle is not limited, but generally, vehicles have front wheels and rear wheels. The mass of the vehicle excluding the wheels and the position of its center of gravity determine the braking intensity required by the front and rear wheels during braking. Usually, during braking, due to the inertia of the vehicle, the front wheels often require greater braking intensity, while the rear wheels need to be protected from locking up.

[0039] First Embodiment

[0040] This application provides a braking device for a car, which will be described below with reference to the accompanying drawings.

[0041] Please refer to Figure 1 and Figure 2. Figure 1 This is a schematic diagram of the braking device for a car provided in the first embodiment of this application. Figure 2 This is a partially enlarged structural diagram of part A of the braking device for a car provided in the first embodiment of this application.

[0042] This application provides a braking device for a car, comprising: a bottom bracket 101, a front wheel brake 102, a rear wheel brake 103, a drive mechanism 104, a front wheel cable 105, a rear wheel cable 106, and a rotating rod 107.

[0043] The rotating rod 107 is rotatably connected to the bottom bracket via a rotating shaft 108. The driving mechanism 104 is mounted on the bottom bracket 101 and is connected to the rotating rod 107 in a transmission manner. The driving mechanism 104 is used to drive the rotating rod 107 to rotate.

[0044] One end of the front wheel cable 105 is connected to the first part of the rotating rod 107, which is located on one side of the rotating shaft 108. The other end of the front wheel cable 105 is connected to the front wheel brake 102. The rotating rod 107 drives the front wheel cable 105 by rotating, so as to control the friction generated inside the front wheel brake 102 and reduce the speed of the front wheel.

[0045] One end of the rear wheel cable 106 is connected to the second part of the rotating rod 107, which is located on the other side of the rotating shaft 108. The other end of the rear wheel cable 106 is connected to the rear wheel brake 103. The rotating rod 107 drives the rear wheel cable 105 by rotating, so as to control the friction generated inside the rear wheel brake 103 and reduce the speed of the rear wheel.

[0046] A hole is provided at the center of the rotating rod 107, through which the rotating rod passes through the rotating shaft 108 and is positioned perpendicular to the rotating shaft 108. In one embodiment, the center of the rotating rod 107 is not fixed to the rotating shaft 108; that is, when the rotating shaft is fixed, the rotating rod 107 can rotate around the rotating shaft 108. In another embodiment, the center of the rotating rod 107 and the rotating shaft 108 are fixed together, and the rotating shaft and the rotating rod cannot move independently; that is, when the rotating rod rotates, it drives the rotating shaft to move synchronously. In this case, the rotating shaft is rotatable relative to the bottom support 101, rotating about its own longer axis of symmetry. In other embodiments, the rotating rod 107 and the rotating shaft 108 can also be unfixed, allowing the rotating rod 107 to rotate about the rotating shaft 108, while the rotating shaft is also movable relative to the bottom support, rotating about its own longer axis of symmetry. The above embodiments are all for the purpose of driving the rotating rod 107 to rotate around a central point, thereby driving the pull cables (a collective term for the front wheel pull cable and the rear wheel pull cable). The rotating rod 107 can rotate from point 107 to point 107-2, thus understanding the rotation direction of the rotating rod.

[0047] The drive mechanism 104 provides a rotational driving force to the rotating rod 107. The drive mechanism 104 can be mounted on the bottom bracket 101, and one end of it is connected to the off-center position of the rotating rod 107. When the drive mechanism 104 is in operation, it can drive the rotating rod 107 to rotate.

[0048] The front wheel cable 105 is used to control the braking of the front wheels of the vehicle. This cable, also known as a brake cable, is generally constructed with an outer layer of rubber covering the inner core of an iron cable. The rubber layer protects the iron cable from oxidation and rust, thus extending its service life. In the first embodiment of this application, taking two front wheels and two rear wheels as an example, as... Figure 1 The two wheels on the left are the front wheels, and the two on the right are the rear wheels. The rotating rod 107 is typically a long strip, but its specific shape and outline are not limited; it is simply divided into two parts along its longer length from its center: a first part and a second part. For ease of explanation, [the following is a simplified description of the rotating rod]. Figure 1 The portion above the pivot is designated as the first part, while the portion below the pivot is designated as the second part.

[0049] One end of the front wheel cable 105 is connected to the first part of the rotating rod 107. The front wheel cable 105 can be tightened or loosened by rotating the rotating rod 107. Furthermore, the front wheel braking status is controlled by the front wheel cable 105. When the rotating rod 107 tightens the front wheel cable 105, the front wheel is braked. When the rotating rod 107 loosens the front wheel cable 105, the braking effect of the front wheel disappears.

[0050] Corresponding to the front wheel cable, one end of the rear wheel cable 106 is connected to the second part of the rotating rod 107. The rear wheel cable 106 can be tightened or loosened by rotating the rotating rod 107. Furthermore, the braking status of the rear wheel is controlled by the rear wheel cable 106. When the rotating rod 107 tightens the rear wheel cable 106, the rear wheel is subjected to braking force, and when the rotating rod 107 loosens the rear wheel cable 106, the braking effect of the rear wheel disappears.

[0051] In one embodiment, the drive mechanism 104 includes a drive motor and a push rod mounted on the bottom bracket. See below. Figure 3 , Figure 3 This is a schematic diagram of the drive mechanism for a braking device for a trolley provided in the first embodiment of this application. The drive mechanism 104 includes a drive motor 1041 and a push rod 1042 mounted on the bottom bracket 101. The drive motor 1041 drives the push rod 1042 to move; the push rod 1042 is connected to the rotating rod 107 so that the rotating rod 107 rotates under the drive of the drive motor 1041. When the drive motor 1041 is running, the gear connected inside the drive motor 1041 rotates, and the gear is connected to the push rod 1042, driving the push rod 1042 to perform linear reciprocating motion. When the drive motor 1041 is powered, the gear rotates in two directions, including counterclockwise rotation and clockwise rotation, which correspond to the extension and retraction movements of the push rod 1042, respectively. In actual implementation, a spring can also be added to the push rod. The drive motor can control the compression of the spring to retract the push rod, and control the extension of the spring to extend the push rod. This structure employs an electrically controlled push rod, serving as a continuation of the braking device in the first embodiment of this application, providing a technical basis for achieving remote control, centralized control, or automatic control. A track or similar structure can be installed below the push rod to control its reciprocating motion within a defined range.

[0052] In one embodiment, the front wheel cable 105 is connected to the rotating rod 107 via a balance block 109. The balance block 109 includes at least two horizontally positioned block structures clamping above and below the front wheel cable 105. The rear wheel cable 106 is also connected to the rotating rod 107 via a balance block, which includes at least two horizontally positioned block structures clamping above and below the rear wheel cable 106. This ensures that the front and rear wheel cables are horizontal, thereby reducing force loss when the rotating rod rotates and drives the front and rear wheel cables. The height difference created when the cable connects to the rotating rod 107 may, due to the cable's structure and material characteristics, prevent the cable from being perpendicularly connected to the rotating rod 107. In other words, the cable may not be at the same horizontal level as the connection point on the rotating rod, resulting in insufficient power from the rotating rod to tighten the cable and brake the wheel. Therefore, a balance block 109 is added at the connection point between the pull wire and the rotating rod to control the pull wire to be as horizontal as possible with the connection point on the rotating rod near the rod. When the connection point between the pull wire and the rotating rod is horizontal, the force transmitted from the rotating rod to the pull wire is the greatest, that is, the force conversion efficiency of the push rod is the greatest. Therefore, the balance block can be set on the upper and lower sides of the pull wire, or balance blocks can be added on the left and right sides. The balance block is a part with a certain rigidity and a fixed shape. The balance block can be square or have a structure where the inner concave surface fits into the surface of the pull wire. The fitted structure can better achieve the effect of fixing the direction of the balance block.

[0053] Existing hydraulic braking systems often require regular manual inspection, monitoring, and brake fluid replacement, resulting in inconvenient maintenance and high long-term maintenance costs. In one embodiment of this application, the first and second portions of the rotating rod each have multiple connecting holes spaced apart along the length of the rotating rod. These connecting holes are used for rotatable connection with either the front wheel cable or the rear wheel cable. Taking the first embodiment of this application as an example, the front wheel cable is connected to the first portion of the rotating rod, and the rear wheel cable is connected to the second portion. When the rotating rod rotates clockwise, both the front and rear wheel cables are tightened. Alternatively, the rear wheel cable can be connected to the first portion of the rotating rod, and the front wheel cable to the second portion. When the rotating rod rotates counterclockwise, both the front and rear wheel cables are tightened. If one of the front and rear wheel cables malfunctions, such as due to wear or breakage, and cannot be properly tightened, the other cable can still effectively brake the corresponding wheel without being affected. Fault detection can be performed by inspecting and repairing the connections between the aforementioned structures to pinpoint the fault location and quickly resolve it. Therefore, the braking device provided in the first embodiment of this application achieves dual-circuit safety characteristics with a simple linear control function, making the inspection and maintenance of the braking device more convenient.

[0054] In one embodiment, a connecting plate 110 is further provided between the front wheel cable and the rotating rod 107. One end of the connecting plate 110 is connected to the connecting hole, and the other end is provided with at least one connecting part. Each front wheel cable is connected to one of the connecting parts. The connecting plate is used to drive the front wheel cable to move when the rotating rod rotates. In a specific implementation, one front wheel cable corresponds to one connecting part, which is the connecting port or connecting position led out from the connecting plate 110, thereby realizing the separation of front and rear wheel braking. If one of the front wheel braking device and the rear wheel braking device fails, the other braking device can still ensure normal operation, realizing the dual-circuit safety feature. In order to enable the rotating rod to be rotatably connected to the front wheel cable, a connecting plate can be provided between the front wheel cable and the rotating rod. The connecting plate is rotatably connected to the connecting hole of the rotating rod. When the front wheel cable is tightened, its direction changes. If the front wheel cable is directly connected to the connecting hole, it is likely that the cable will be pressed against the edge of the hole. The friction between the connecting hole and the cable may cause the cable to jam and become unable to be pulled further. Repeated applications may also cause wear to the cable. To address these issues, a connecting plate is installed directly between the front wheel cable and the connecting hole of the rotating rod to resolve the friction caused by the connecting hole on the cable.

[0055] Since the front wheel cable and the rear wheel cable are separately connected to the first and second parts of the rotating rod, a connecting plate is also provided between the rear wheel cable and the rotating rod, corresponding to the connection method between the front wheel cable and the rotating rod. The rear wheel cable 106 is connected to the connecting portion on the connecting plate, and the connecting plate is connected to the rotating shaft through a connecting hole. The arrangement and effect of the connecting plate are similar to those of the connecting plate for the front wheel cable. For details not explained here, please refer to the aforementioned description of the front wheel cable.

[0056] Considering that most cars have four wheels, including two front wheels and two rear wheels, in one embodiment, the connecting plate has a T-shaped structure. The vertical portion of the connecting plate is connected to the rotating shaft through the connecting hole, and the horizontal portion of the connecting plate is the part away from the rotating shaft. The horizontal portion of the connecting plate has a first connecting part and a second connecting part. The first front wheel cable is connected to the connecting plate through the first connecting part, and the second front wheel cable is connected to the connecting plate through the second connecting part. The first front wheel is equipped with a first front wheel brake, which is connected to the first front wheel cable and connected to the rotating shaft through the first connecting part on the T-shaped connecting plate. Correspondingly, the second front wheel is equipped with a second front wheel brake, which is connected to the second front wheel cable and connected to the rotating shaft through the second connecting part on the T-shaped connecting plate.

[0057] In one embodiment, the number and location of the connecting holes are symmetrically distributed about the central axis of the rotating rod. For example... Figure 1 As shown, the first part of the rotating rod has four connecting holes, and the second part of the rotating rod also has four connecting holes. The first and second parts of the rotating rod are of the same length to ensure that the rotating rod is in a balanced state. When the first and second parts of the rotating rod are symmetrical in length, shape, mass, etc., the performance of the rotating rod is optimal, and it can also help the braking device achieve balance. The connecting holes on one side of the rotating rod can be connected by a slide rail. When it is necessary to adjust the connecting holes, the connecting part between the pull cable and the rotating rod can be moved through the slide rail without having to completely remove it from the braking device and then reinstall it. Therefore, the slide rail makes the process of adjusting the connecting holes more convenient.

[0058] The selection of the connecting hole can be determined based on the mass and center of gravity of the trolley. Since the distance between the connecting hole and the rotating shaft varies on one side of the rotating rod, the rotation length of each connecting hole differs when the rotating rod rotates the same distance. The connecting hole farther from the rotating shaft requires a longer rotation, and vice versa. Therefore, the position of the connecting hole determines the braking time. The process of the push rod pushing the rotating rod and the process of the rotating rod driving the tension cable connected to the connecting hole to tighten occur simultaneously. When the push rod continues to push forward, the connecting hole continues to rotate, and the tension cable continues to be tightened. The maximum degree of tightening achieved depends on the displacement generated by the push rod. When the push rod begins to retract, the degree of tightening gradually decreases. When the push rod fully returns to its initial state (generally fully retracted), i.e., when the displacement is 0, the degree of tightening also disappears. When the displacement generated by the push rod is constant, the connecting holes farther away reach the maximum degree of tightening in a longer time, while the connecting holes closer to the shaft reach the maximum degree of tightening in a shorter time. Therefore, the selection of the connecting hole determines the response time of the braking effect. When the connecting hole is far from the center, the braking response time is longer, while when the connecting hole is close to the center, the braking response time is shorter.

[0059] The above analysis of braking response time is based on the same vehicle. When the mass of the vehicle changes, with the same initial velocity, the inertia generated during its motion also increases accordingly, requiring a larger braking force. When the push rod applies the same force to the rotating rod, the force transmitted to the pull wire from the connecting hole that is farther away is often greater than that from the connecting hole that is closer. Therefore, for a heavier vehicle, a connecting hole farther from the center can be selected.

[0060] In one embodiment, the brake can be a cable-operated drum brake. The force generated by the cable causes friction within the cable-operated drum brake, reducing the rotational speed of the corresponding wheel. The brake internally includes a return spring, brake shoes, and a brake drum. When subjected to the tension forces of the front and rear wheel cables, friction is generated between the brake shoes and the brake drum to slow the rotational speed of the front and rear wheels. When the forces of the front and rear wheel cables dissipate, the return spring within the drum brake returns the brake to its original position, releasing the braking force on the wheels. When the drum brake receives the tension transmitted by the cable, the brake shoes inside the brake drum are pushed towards the inside of the brake drum. The friction pads on the brake shoes contact the inner surface of the brake drum, generating friction. The friction between the brake drum and the brake shoes converts kinetic energy into heat energy. This friction resists the rotational motion of the wheels, causing the wheel speed to gradually decrease, thereby slowing down or stopping the vehicle. In addition, since friction generates a lot of heat, the brake drum and brake shoes must be designed to effectively dissipate heat in order to avoid overheating and affecting braking performance.

[0061] In a simplified braking device, the aforementioned drive mechanism can be replaced by a cable-operated motor. When energized, the cable-operated motor causes the wires at both ends to retract towards the center. In this case, the cable-operated motor acts as a power source, providing power to drive the cable, and the tension is transmitted to the cable-operated drum brakes of each wheel, producing a braking effect.

[0062] The braking device for a car provided in the first embodiment of this application uses a drive mechanism to rotate a rotating rod around a pivot, thereby tightening a cable. The cable is connected to the brake, and when it tightens, it triggers the braking process, thus reducing the wheel speed. Furthermore, the two ends of the rotating rod are connected to the front wheel cable and the rear wheel cable, respectively. When the rotating rod rotates, the front and rear wheel cables tighten inward, controlling the brake to generate friction, thereby braking the front and rear wheels. Therefore, the braking device for a car provided in this application achieves braking of a low-speed car using a simple drive-by-wire structure.

[0063] In the field of new energy vehicles, charging vehicles can be moved to their destination using autonomous driving technology. The charging vehicle typically has a mass of at least 1 ton, classifying it as a typical large-mass, low-speed vehicle. Applying the braking device provided in the first embodiment of this application to the charging vehicle can achieve good braking performance.

[0064] Second Embodiment

[0065] The second embodiment of this application provides a vehicle, the braking device of which includes the braking device for a vehicle provided in the first embodiment. In the second embodiment, relevant parts are described schematically only; please refer to the first embodiment for details.

[0066] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of a vehicle provided in the second embodiment of this application. The vehicle 400 provided in the second embodiment of this application includes wheels 401, a controller 402, and a braking device 403, wherein the braking device 403 includes any of the aforementioned braking devices for vehicles.

[0067] The drive mechanism of the braking device 403 is electrically connected to the controller of the vehicle. The controller sends a braking signal to the drive mechanism, which includes braking force and braking time. Specifically, the drive motor of the drive mechanism can be connected to the vehicle interface of the controller. The braking signal includes braking time, braking force, etc. The controller includes an automatic calculation unit, which calculates the braking time and braking force based on the environment of the vehicle and sends them to the drive motor. This causes the drive motor to control the push rod to move according to the braking signal, thereby reducing the wheel speed and braking the vehicle. The environment of the vehicle can be obtained through data acquired by sensors and cameras installed on the vehicle.

[0068] The vehicle structure provided in the second embodiment of this application provides a technical basis for braking of unmanned low-speed vehicles, achieving braking effect with a simple drive-by-wire structure.

[0069] It should be noted that although several structures, components, or units for implementing the relevant functions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the specific embodiments of this application, the features and functions of two or more structures, components, or units described above can be embodied in one structure, component, or unit. Conversely, the features and functions of one structure, component, or unit described above can be further divided and embodied by multiple components, structures, or units.

[0070] Furthermore, although the various components of the components or apparatus in this application and the mounting arrangements between them are described in a specific order in the accompanying drawings, this does not require or imply that the components or apparatus must be designed according to that specific component or mounting arrangement, or that all the components shown must be included to achieve the desired result. Additional or alternative components may be omitted, multiple components may be combined into one component to achieve the corresponding function, and / or a component may be decomposed into multiple components to achieve the corresponding function, etc.

[0071] Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

Claims

1. A braking device for a car, characterized in that, include: Bottom bracket, front wheel brake, rear wheel brake, drive mechanism, front wheel cable, rear wheel cable, and rotating rod; The rotating rod is rotatably connected to the bottom bracket via a rotating shaft. The driving mechanism is mounted on the bottom bracket and is connected to the rotating rod in a transmission manner. The driving mechanism is used to drive the rotating rod to rotate. One end of the front wheel cable is connected to the first part of the rotating rod, which is located on one side of the rotating shaft. The other end of the front wheel cable is connected to the front wheel brake. The rotating rod drives the front wheel cable by rotating, thereby controlling the friction generated inside the front wheel brake to reduce the speed of the front wheel. One end of the rear wheel cable is connected to the second part of the rotating rod, which is located on the other side of the rotating shaft. The other end of the rear wheel cable is connected to the rear wheel brake. The rotating rod drives the rear wheel cable by rotating, thereby controlling the friction generated inside the rear wheel brake to slow down the speed of the rear wheel.

2. The braking device for a car according to claim 1, characterized in that, The drive mechanism includes a drive motor and a push rod mounted on the bottom bracket, wherein the drive motor is used to drive the push rod to move. The push rod is connected to the rotating rod in a transmission manner, so as to drive the rotating rod to rotate under the drive of the drive motor.

3. The braking device for a car according to claim 1, characterized in that, The front wheel cable is connected to the rotating rod via a balance block. The balance block includes at least two block-shaped structures that are horizontally clamped above and below the front wheel cable to keep the front wheel cable and the rear wheel cable in a horizontal state through horizontal clamping.

4. The braking device for a car according to claim 3, characterized in that, The first part and the second part of the rotating rod are provided with multiple connecting holes. The multiple connecting holes are arranged at intervals along the length of the rotating rod. The connecting holes are used to rotatably connect with the front wheel cable or the rear wheel cable.

5. The braking device for a car according to claim 4, characterized in that, A connecting plate is also provided between the front wheel cable and the rotating rod. One end of the connecting plate is connected to the connecting hole, and the other end is provided with at least one connecting part. Each front wheel cable is connected to one of the connecting parts. Each balance block is connected to the connecting plate through each of the connecting parts. The connecting plate is used to drive the front wheel cable to move when the rotating rod rotates.

6. The braking device for a car according to claim 5, characterized in that, The front wheel cable includes a first front wheel cable and a second front wheel cable. The first front wheel cable is connected to one front wheel brake, and the second front wheel cable is connected to the other front wheel brake. The connecting plate has a T-shaped structure. The horizontal portion of the connecting plate has a first connecting part and a second connecting part, which are respectively located at both ends of the horizontal portion. The first front wheel cable is connected to the connecting plate through the first connecting part, and the second front wheel cable is connected to the connecting plate through the second connecting part.

7. The braking device for a car according to claim 4, characterized in that, The number and position of the connecting holes are symmetrically distributed about the central axis of the rotating rod.

8. The braking device for a car according to claim 4, characterized in that, The first and second parts of the rotating rod are of the same length.

9. The braking device for a car according to claim 1, characterized in that, The brake internally includes a return spring, brake shoes, and a brake drum, which, when subjected to the tension force of the front wheel cable and the rear wheel cable, causes friction between the brake shoes and the brake drum to reduce the rotational speed of the front and rear wheels. When the force exerted by the front wheel cable and the rear wheel cable disappears, the return spring inside the brake causes the brake shoes to return to their original position, thereby releasing the braking of the front and rear wheels.

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