Braking system and vehicle

Abstract

This application provides a braking device and a vehicle, relating to the field of vehicle technology, and aims to solve the problem of how to compress the axial dimension of a braking device. The braking device includes a rotary drive assembly, a first rotating member, a second rotating member, and a piston. The first rotating member is connected to the output end of the rotary drive assembly, and the second rotating member is drivenly connected to the first rotating member. The piston is adapted to connect to a friction pad and is drivenly connected to the second rotating member. When the rotary drive assembly drives the first rotating member to rotate in a first direction, the first rotating member drives the entire assembly consisting of the second rotating member and the piston to move towards the brake disc, so that the friction pad engages with the brake disc for braking. When the rotary drive assembly drives the first rotating member to rotate in a second direction, the first rotating member drives the second rotating member to rotate relative to the piston in the second direction, and causes the piston to move relative to the second rotating member towards the brake disc; wherein the first direction and the second direction are opposite.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a braking device and a vehicle. Background Technology

[0002] As an important device to ensure vehicle safety, the braking system is usually located near the wheel hub and is used to decelerate and brake the vehicle.

[0003] With the development of vehicle intelligence, the number of vehicle functional modules is gradually increasing, and the demand for space utilization is also constantly rising. Due to the limited space near the vehicle wheel hub, the braking system needs to improve its structural compactness to meet the space assembly requirements.

[0004] Some electromechanical braking devices in related technologies adopt a layout in which the load braking height and clearance adjustment height are axially superimposed. This results in a large axial space occupation, loose structure, and difficulty in meeting the assembly requirements inside the vehicle wheel hub. Summary of the Invention

[0005] The purpose of this application is to provide a braking device and a vehicle that addresses the problem of how to compress the axial dimension of the braking device.

[0006] In a first aspect, this application provides a braking device, which includes a rotary drive assembly, a first rotating member, a second rotating member, and a piston. The first rotating member is connected to the output end of the rotary drive assembly, and the second rotating member is drivenly connected to the first rotating member. The piston is adapted to connect to a friction plate and is drivenly connected to the second rotating member.

[0007] When the rotary drive assembly drives the first rotating member to rotate in the first direction, the first rotating member drives the second rotating member and the piston to move towards the brake disc, so that the friction pads cooperate with the brake disc for braking; when the rotary drive assembly drives the first rotating member to rotate in the second direction, the first rotating member drives the second rotating member to rotate relative to the piston in the second direction, and causes the piston to move relative to the second rotating member towards the brake disc; wherein, the first direction is opposite to the second direction.

[0008] The braking device provided in this application embodiment, relying on the forward and reverse switching of the rotary drive component and the cooperation of the first rotating component, the second rotating component, and the piston, can achieve braking thrust output and automatic compensation of friction plate wear clearance within the same transmission chain. This eliminates the need for a separate gap-adjusting motor, electromagnetic clutch, or additional gap-adjusting actuator, reducing the number of parts and simplifying the structure. With this configuration, both the braking extension stroke and the gap-adjusting stroke are achieved through the same axial propulsion path, eliminating the need to reserve additional axial space for gap adjustment. This shortens the overall axial dimension of the braking device, making it more suitable for wheel-side arrangement scenarios with limited space.

[0009] Furthermore, the power transmission path from the rotary drive assembly to the piston in this braking device consists of only two rotating parts, resulting in fewer motion conversion links, lower mechanical losses, and higher transmission efficiency.

[0010] In some embodiments, one of the first rotating member and the second rotating member is provided with a pushing member, and the other is provided with a mating surface. The mating surface mates with the pushing member, and the mating surface includes a first position and a second position arranged circumferentially along the other member. The first position and the second position are at different distances from the brake disc. When the rotary drive assembly drives the first rotating member to rotate in a first direction, the pushing member moves from the first position to the second position along the mating surface, so as to drive the whole consisting of the second rotating member and the piston to move closer to the brake disc.

[0011] In some embodiments, the pusher is a ball; one of the first rotating member and the second rotating member is provided with a concave ball groove, and a portion of the ball is accommodated in the concave ball groove.

[0012] In some embodiments, the other of the first rotating member and the second rotating member is provided with a mating groove, a portion of the ball is accommodated in the mating groove, and the bottom surface of the mating groove forms a mating surface.

[0013] In some embodiments, the braking device further includes a cage located between the first rotating member and the second rotating member, with balls disposed in the cage.

[0014] In some embodiments, the mating surface further includes a third position along the circumference of the other, the third position being located on the side of the first position opposite to the second position, and the third position having a circumferential stop portion; when the rotary drive assembly drives the first rotating member to rotate in the second direction, the push member moves along the mating surface from the first position to the third position, so that the push member engages with the circumferential stop portion, thereby driving the second rotating member to rotate relative to the piston in the second direction.

[0015] In some embodiments, the third position is spaced apart from the first position, and the distances from the first position and the third position to the brake disc are different.

[0016] In some embodiments, the other of the first rotating member and the second rotating member is provided with a mating groove, the sidewall of the mating groove forms a circumferential stop, and the bottom surface of the mating groove forms a mating surface.

[0017] In some embodiments, the braking device further includes a limiting structure connected to the second rotating member, for allowing the second rotating member to rotate in a second direction and preventing the second rotating member from rotating in a first direction.

[0018] In some embodiments, the limiting structure includes a ratchet and a pawl structure, one of which is disposed on the second rotating member and the other on the piston.

[0019] In some embodiments, the braking device further includes an elastic reset member connected between the first rotating member and the second rotating member.

[0020] In some embodiments, one of the second rotating member and the piston is provided with a threaded hole, and the other includes a screw threaded into the threaded hole; when the second rotating member rotates relative to the piston in a second direction, the piston moves relative to the second rotating member toward the brake disc by means of the threaded hole and the screw.

[0021] In some embodiments, the rotary drive assembly includes a rotary drive member and a reduction assembly, the rotary drive member being disposed around the periphery of the reduction assembly.

[0022] Secondly, this application also provides a vehicle including a braking device provided in any embodiment of the first aspect.

[0023] It should be noted that the technical effects of the implementation method in the second aspect can be found in the technical effects of the corresponding implementation method in the first aspect, and will not be repeated here. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of 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 based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of this application; Figure 2 A system schematic diagram of a braking device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a braking device provided in an embodiment of this application; Figure 4 for Figure 3 A partial schematic diagram of the braking device is shown; Figure 5 for Figure 3 A schematic diagram of the trajectory of the pushing component and the mating surface in the braking device shown; Figure 6 for Figure 3 An exploded view of part of the braking device shown. Figure 7 for Figure 3 The diagram shows the structure of the limiting structure in the braking device. Figure 8 for Figure 7 The cross-sectional view of the limiting structure shown.

[0026] Figure label: 1000, vehicle; 100, vehicle body; 200, wheel; 300, braking device; 1. Rotary drive assembly; 11. Rotor; 12. Stator; 13. Sun gear; 14. Double planetary gear; 15. Planetary carrier; 16. Planetary carrier bearing; 2. First rotating component; 21. First position; 22. Second position; 23. Third position; 3. Second rotating component; 31. Ratchet; 4. Piston; 41. Pawl; 42. Fixing element; 43. Elastic element; 5. Pushing component; 51. Cage; 61. Elastic reset component; 62. Open retaining ring; 7. Force sensor; 8. Thrust needle roller bearing; 9. Housing. Detailed Implementation

[0027] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0028] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0029] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0030] In the embodiments of this application, "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, where the range of similarity is within an acceptable deviation range, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range for approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range for approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range for approximate equality can be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0031] This application provides a vehicle, which can be a hybrid vehicle, a range-extended electric vehicle, a plug-in hybrid vehicle, a pure electric vehicle, etc. The vehicle can also be an engineering vehicle, a special-purpose vehicle, etc.

[0032] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in an embodiment of this application. The vehicle 1000 may include a body 100 and wheels 200. The body 100 is used for passengers to ride in and for carrying goods. The wheels 200 are installed under the body 100 to support the body 100 and are able to roll on the road surface so that the vehicle 1000 can move.

[0033] In some embodiments, the vehicle 1000 may include a drive unit that is tractively connected to the wheel 200 and provides power to the wheel 200 to rotate the wheel 200 so as to drive the vehicle 1000 forward or backward.

[0034] In some embodiments, the vehicle 1000 may further include a suspension system connected between the wheel 200 and the body 100 to absorb vibrations and impacts between the wheel 200 and the body 100. The vehicle 1000 may also include a steering knuckle, which is also throttledly connected to the wheel 200 to steer the wheel 200.

[0035] In some embodiments, the vehicle 1000 may include a braking device 300, which is a core component that generates braking torque. The braking device 300 can be connected to or frictionally engaged with the wheel 200 to transmit braking force to the wheel 200, thereby enabling the vehicle 1000 to decelerate or park.

[0036] Since components such as the drive unit, suspension unit, and braking unit 300 are directly or indirectly connected to the wheel 200, and the space at the wheel 200 is limited, it is necessary to improve its structural compactness to meet the space assembly requirements.

[0037] Some existing electromechanical braking devices adopt a layout in which the load braking height and clearance adjustment height are axially superimposed. This results in a large axial space occupation and a loose structure. Furthermore, the motor, reducer and actuator are arranged in parallel along the radial direction in this braking device, which leads to an excessively large radial dimension of the braking device, making it difficult to meet the assembly requirements within a 1000 wheel hub of a vehicle.

[0038] Based on this, please refer to Figures 2-4 , Figure 2 This is a system schematic diagram of a braking device 300 provided in an embodiment of this application. Figure 3 This is a schematic diagram of the structure of a braking device 300 provided in an embodiment of this application. Figure 4 for Figure 3 The diagram shows a partial schematic of the braking device 300. This application provides a braking device 300, which includes a rotary drive assembly 1, a first rotating member 2, a second rotating member 3, and a piston 4. The first rotating member 2 is connected to the output end of the rotary drive assembly 1, and the second rotating member 3 is drivenly connected to the first rotating member 2. The piston 4 is adapted to connect a friction plate and is drivenly connected to the second rotating member 3.

[0039] When the rotary drive assembly 1 drives the first rotating member 2 to rotate in the first direction, the first rotating member 2 drives the second rotating member 3 and the piston 4 to move towards the brake disc so that the friction pads cooperate with the brake disc for braking; when the rotary drive assembly 1 drives the first rotating member 2 to rotate in the second direction, the first rotating member 2 drives the second rotating member 3 to rotate relative to the piston 4 in the second direction, and causes the piston 4 to move relative to the second rotating member 3 towards the brake disc; wherein, the first direction is opposite to the second direction.

[0040] The rotary drive assembly 1 is used to provide active rotary power. The rotary power is transmitted to the piston 4 through the first rotating component 2 and the second transmission component, so that the piston 4 moves linearly to achieve vehicle 1000 braking and friction pad clearance compensation.

[0041] When the first rotating member 2 rotates in the first direction, i.e., when the first rotating member 2 rotates forward, the second rotating member 3 and the piston 4 move as a whole toward the brake disc. This allows the friction pad connected to the piston 4 to move closer to the brake disc, increasing the friction between the friction pad and the brake disc, thus achieving deceleration and braking of the vehicle 1000. When the first rotating member 2 rotates in the second direction, i.e., when the first rotating member 2 rotates in the reverse direction, the piston 4 moves relative to the second rotating member 3 toward the brake disc. This reduces the gap between the piston 4 and the brake disc. In this way, the reverse rotation of the first rotating member 2 can compensate for the wear gap of the friction pad, eliminating the need for an additional gap-adjusting motor.

[0042] The braking device 300 provided in this application embodiment relies solely on the forward and reverse switching of the rotary drive component 1, and the cooperation of the first rotating component 2, the second rotating component 3, and the piston 4. It can achieve automatic compensation of braking thrust output and friction plate wear gap in the same transmission chain, without the need to add an independent gap adjusting motor, electromagnetic clutch, or additional gap adjusting actuator, thereby reducing the number of parts in the braking device 300 and simplifying the structure.

[0043] The braking device 300 achieves both the braking extension stroke and the clearance adjustment stroke through the same axial propulsion path, eliminating the need to reserve additional axial space for clearance adjustment. This shortens the overall axial length of the braking device 300, making it easier to adapt to wheel-side layout scenarios with limited space.

[0044] Furthermore, the power transmission path from the rotary drive assembly 1 to the piston 4 in the braking device 300 consists of only two rotating parts, resulting in fewer motion conversion links, lower mechanical losses, and higher transmission efficiency.

[0045] Among them, such as Figure 4 As shown, A is the braking ejection stroke length of the braking device 300, and B is the clearance compensation stroke length of the piston 4.

[0046] Please refer to Figures 2-5 , Figure 5 for Figure 3 The schematic diagram of the trajectory of the pusher 5 and the mating surface in the braking device 300 is shown. In some embodiments, one of the first rotating member 2 and the second rotating member 3 is provided with the pusher 5, and the other is provided with the mating surface. The mating surface mates with the pusher 5, and the mating surface includes a first position 21 and a second position 22 arranged circumferentially along the other. The distances from the first position 21 and the second position 22 to the brake disc are different.

[0047] When the rotary drive assembly 1 drives the first rotating member 2 to rotate in the first direction, the pusher 5 moves from the first position 21 to the second position 22 along the mating surface, so as to drive the whole consisting of the second rotating member 3 and the piston 4 to move closer to the brake disc.

[0048] With this configuration, when the first rotating member 2 rotates in the first direction, the pushing member 5 moves circumferentially on the mating surface. Since the axial distances from the first position 21 and the second position 22 on the mating surface to the brake disc are different, the pushing member 5 can move from the first position 21 to the second position 22, which can convert the rotational motion of the first rotating member 2 into the axial linear displacement of the second rotating member 3 and the piston 4 as a whole, thereby realizing the output of braking thrust.

[0049] With this configuration, the braking device 300 has a simple structure. The power transmission direction can be changed simply by the engagement of the pusher 5 with the contour of the mating surface. There is no need for complex planetary gears, ball screws or cam ring structures, which can reduce the number of parts and reduce the difficulty of processing.

[0050] By setting a first position 21 and a second position 22 arranged circumferentially on the mating surface, the axial height difference between the first position 21 and the second position 22 can determine the braking stroke. No additional axial arrangement space is required, which is beneficial to compress the axial dimension of the braking device 300 while ensuring the required working stroke.

[0051] In addition, the pusher 5 mates with the mating surface, directly outputting axial thrust while transmitting torque, without intermediate elastic deformation links, resulting in high transmission stiffness, fast braking response speed, and higher braking force control precision.

[0052] Please refer to Figures 3-6 , Figure 6 for Figure 3 The exploded view of a portion of the braking device 300 shows that in some embodiments, the pusher 5 is a ball bearing, and one of the first rotating member 2 and the second rotating member 3 is provided with a concave ball groove, with part of the ball bearing housed in the concave ball groove.

[0053] With this configuration, the ball bearings are embedded in the concave ball groove. The fit between the spherical surface and the groove wall forms a circumferential limiting and axial bearing structure. When the first rotating component 2 rotates, the ball bearings are driven by the concave ball groove, moving from the first position 21 to the second position 22, and pushing the second rotating component 3 to move axially. The concave ball groove constrains and positions the ball bearings, preventing them from falling off or shifting under high-speed rotation or vibration conditions.

[0054] In some embodiments, the other of the first rotating member 2 and the second rotating member 3 is provided with a mating groove, a portion of the ball is accommodated in the mating groove, and the bottom surface of the mating groove forms a mating surface.

[0055] This design allows the bottom surface of the mating groove to form an inclined or stepped mating surface with a height difference along the axial direction. The ball, pushed by the concave ball groove, moves along the bottom surface of the mating groove, converting the rotational motion of the first rotating member 2 into the linear motion of the second rotating member 3. The mating groove also guides the movement of the ball, ensuring that it moves from the first position 21 to the second position 22, thereby driving the second rotating member 3 and the piston 4 to move linearly along the axial direction and preventing wobbling.

[0056] In some embodiments, the braking device 300 further includes a retainer 51 located between the first rotating member 2 and the second rotating member 3, with balls disposed in the retainer 51.

[0057] The retainer 51 can fix and limit the ball, preventing the ball from accidentally coming out between the first rotating member 2 and the second rotating member 3, which would cause the brake device 300 to malfunction.

[0058] In some embodiments, the number of pushers 5 and mating surfaces is one pair. In other embodiments, the number of pushers 5 and mating surfaces can be multiple pairs, with multiple pairs of pushers 5 and mating surfaces spaced circumferentially. This reduces the load on individual balls and makes the braking thrust of the pushers 5 more uniform.

[0059] When there are multiple pairs of pusher 5 and mating surfaces, cage 51 can fix and limit multiple balls to ensure the accuracy of the transmission path.

[0060] In some embodiments, the mating surface further includes a third position 23 along the circumference of the other. The third position 23 is located on the side of the first position 21 opposite to the second position 22, and the third position 23 is provided with a circumferential stop. When the rotary drive assembly 1 drives the first rotating member 2 to rotate in the second direction, the push member 5 moves along the mating surface from the first position 21 to the third position 23, so that the push member 5 engages with the circumferential stop, thereby driving the second rotating member 3 to rotate relative to the piston 4 in the second direction.

[0061] With this configuration, when the first rotating member 2 rotates along the second direction, the pushing member 5 moves from the first position 21 to the third position 23. When the pushing member 5 reaches the third position 23, it abuts against the circumferential stop, forming a rigid circumferential limit. At this time, the first rotating member 2 continues to rotate, and the pushing member 5 can no longer move circumferentially along the mating surface, thereby forcing the second rotating member 3 to follow the first rotating member 2 and rotate relative to the piston 4 along the second direction, thus causing the piston 4 to move axially closer to the brake disc, achieving the clearance adjustment action.

[0062] In this way, the braking device 300 is circumferentially segmented by the mating surfaces, and only the power output direction of the rotary drive component 1 needs to be adjusted to freely switch between the two motion modes of braking and gap adjustment. The structure is simple, which can improve the functional density, reliability and economy of the braking device 300, and is conducive to the miniaturization and compactness of the braking device 300.

[0063] In some embodiments, the third position 23 is spaced apart from the first position 21, and the distances from the first position 21 and the third position 23 to the brake disc are different along the axial direction of the first rotating member 2.

[0064] With this configuration, when the first rotating member 2 rotates in the second direction, after the pushing member 5 switches from the first position 21 to the third position 23, the circumferential stop begins to function, causing the second rotating member 3 to rotate relative to the piston 4 in the second direction, driving the piston 4 to adjust the clearance along the axial displacement. Therefore, the distances from the first position 21 and the third position 23 to the brake disc are different. By monitoring the axial height of the first rotating member 2 and the second rotating member 3, it can be determined whether the clearance adjustment action is triggered, which helps to provide rapid feedback on the motion state of the braking device 300 and improve the accuracy and sensitivity of the clearance adjustment action.

[0065] In some embodiments, the other of the first rotating member 2 and the second rotating member 3 is provided with a mating groove, the sidewall of the mating groove forms a circumferential stop, and the bottom surface of the mating groove forms a mating surface.

[0066] This design, combined with the long groove, integrates the guiding function, axial bearing function, and circumferential limiting function into one unit. The structure is simple and occupies less space, which helps to meet the requirements of the braking device 300 for miniaturization, low cost, and high reliability.

[0067] Please refer to Figures 3-8 , Figure 7 for Figure 3 A schematic diagram of the limiting structure in the braking device 300. Figure 8 for Figure 7 In some embodiments, the braking device 300 further includes a limiting structure connected to the second rotating member 3, which allows the second rotating member 3 to rotate in a second direction and prevents the second rotating member 3 from rotating in a first direction.

[0068] With this configuration, when the first rotating member 2 rotates in the first direction, the limiting structure applies reverse resistance to the second rotating member 3, restricting its circumferential rotation relative to the piston 4, ensuring that the second rotating member 3 and the piston 4 form a rigid whole and advance synchronously toward the brake disc; when the first rotating member 2 rotates in the second direction, the limiting structure allows the second rotating member 3 to rotate freely relative to the piston 4 to achieve gap adjustment.

[0069] In this way, during braking, the limiting structure can eliminate the circumferential loose gap between the second rotating part 3 and the piston 4, ensuring that the output torque of the rotary drive assembly 1 is fully converted into the axial thrust of the piston 4, thereby improving power transmission efficiency and making the response faster.

[0070] During the gap adjustment process, the limiting structure does not apply additional resistance to the rotation of the second rotating part 3, allowing it to rotate smoothly under a small torque, preventing gap adjustment jamming or motor stalling due to excessive reverse resistance, and improving the reliability of gap adjustment.

[0071] By using the unidirectional limiting structure, the reverse self-locking function of the second rotating component 3 can be realized, thereby improving the braking capacity of the braking device 300 and the reliability of the gap adjustment function.

[0072] In some embodiments, the limiting structure includes a ratchet 31 and a pawl structure, one of which is located on the second rotating member 3 and the other is located on the piston 4.

[0073] The ratchet 31 and pawl 41 have a one-way meshing characteristic. When the first rotating member 2 rotates in the first direction, the pawl structure engages in the tooth groove of the ratchet 31, forming a mechanical lock and preventing the second rotating member 3 from rotating relative to the piston 4 in the first direction, forcing both to advance axially synchronously. When the first rotating member 2 rotates in the second direction, the pawl structure slides along the tooth surface of the ratchet 31, allowing the second rotating member 3 to rotate freely relative to the piston 4, thus enabling clearance adjustment.

[0074] In this way, the one-way locking function of the braking device 300 can be achieved solely through the mechanical cooperation of the ratchet 31 and the pawl structure, without the need for electric, hydraulic or electromagnetic force. Even if the vehicle loses power or the controller fails, the locking function still exists, which can effectively prevent the accidental loss of braking force and improve the reliability and safety of the braking device 300.

[0075] In other embodiments, the limiting structure may also include a one-way bearing, a spiral spline, or a wedge-type one-way clutch, etc., which are not further limited in this application.

[0076] In some embodiments, the pawl structure may be disposed on the inner wall surface of the piston 4 facing the second rotating member 3, and the ratchet 31 may be disposed around the outer peripheral surface of the second rotating member 3.

[0077] The pawl structure may include a pawl 41, a fixing member 42, and an elastic member 43. The elastic member 43 is connected between the inner wall surface of the piston 4 and the pawl 41. The fixing member 42 is used to limit the pawl 41 to the inner wall surface of the piston 4. The elastic member 43 can apply a preload to the pawl 41 to keep the pawl 41 in the initial engagement position. When the second rotating member 3 rotates relative to the piston 4 in the second direction, the ratchet teeth of the ratchet wheel 31 rotate in the direction of the teeth. The tooth surface of the ratchet teeth acts on the pawl 41, causing it to overcome the preload of the elastic member 43 and deflect. Its working end tilts away from the axis of the second rotating member 3, thereby smoothly sliding over the tooth tip, avoiding motion interference, and ensuring that the second rotating member 3 can rotate smoothly.

[0078] In some embodiments, a receiving cavity is formed in the fixing member 42, at least a portion of the elastic member 43 and the pawl 41 are received in the receiving cavity, and the surface of the pawl 41 extends out of the receiving cavity to engage with the ratchet 31.

[0079] In some embodiments, the fixing member 42 is interference-fitted with the inner wall surface of the piston 4.

[0080] In some embodiments, one of the second rotating member 3 and the piston 4 is provided with a screw hole, and the other includes a screw rod that is threaded into the screw hole; when the second rotating member 3 rotates relative to the piston 4 in a second direction, the piston 4 moves relative to the second rotating member 3 toward the brake disc by means of the screw hole and the screw rod.

[0081] With this configuration, when the second rotating component 3 rotates in the second direction, the rotational motion of the second rotating component 3 can be converted into the axial linear motion of the piston 4 through the threaded engagement of the screw and threaded hole. This drives the piston 4 and the friction plate towards the brake disc, achieving the clearance adjustment function. Thus, by controlling the transmission ratio of the screw and threaded hole structure, the axial displacement of the piston 4 can be precisely controlled, facilitating accurate compensation for minor wear of the friction plate and improving the accuracy and reliability of the braking device 300.

[0082] In some embodiments, the rotary drive assembly 1 includes a rotary drive member and a deceleration assembly, with the rotary drive member arranged around the periphery of the deceleration assembly.

[0083] By surrounding the rotary drive component with the deceleration assembly, the rotary drive component and the deceleration assembly can be changed from the traditional axial arrangement to a radial nested arrangement, which effectively shortens the axial length of the rotary drive assembly 1 and frees up axial space for the piston 4, friction pads and other components of the braking device 300.

[0084] In some embodiments, the rotary drive assembly 1 and the first rotating member 2 are arranged axially. This arrangement, compared to a conventional radially parallel layout, reduces the radial dimension of the braking device 300 in this embodiment while maintaining the same performance, thus enhancing the overall structural rigidity. Simultaneously, since all functional units are arranged along a single axis, the assembly process only requires sequential axial tightening, eliminating the complexity of multi-directional assembly and thereby improving production efficiency and product consistency.

[0085] In some embodiments, the braking device 300 may include a housing 9 for providing support and protection for the braking device 300.

[0086] In some embodiments, the rotary drive may include a motor. The motor may include a rotor 11 and a stator 12, wherein the stator 12 is fixedly mounted on the housing 9 and is arranged around the rotor 11. When the motor is energized, the rotor 11 can rotate relative to the stator 12 about the central axis of the motor.

[0087] In some embodiments, the motor can be configured as a brushless motor. Brushless motors have no brush voltage drop and friction loss, resulting in higher output efficiency and lower power consumption under the same braking force requirements, which helps to increase the vehicle's driving range by 1000 km.

[0088] In some embodiments, the reduction assembly may include a sun gear 13, which is connected to the output end of the rotary drive member. When the rotor 11 rotates, the sun gear 13 can be driven to rotate.

[0089] The reduction assembly may also include a double planetary gear 14 and a planet carrier 15. The sun gear 13 meshes externally with the double planetary gear 14. The rotary drive assembly 1 achieves speed reduction and torque increase through the planetary gear system, and the planet carrier 15 outputs a larger torque.

[0090] The planetary carrier 15 is connected to the first rotating member 2 via a spline, driving the first rotating member 2 to rotate. The rotational motion of the drive disc 7 is converted into the axial pushing motion of the second rotating member 3. The second rotating member 3 is connected to the piston 4 via a threaded pair. When the first rotating member 2 rotates in the first direction, the two move axially together, and finally the piston 4 pushes the friction plate to press against the brake disc, thereby achieving the braking effect.

[0091] In some embodiments, the reduction assembly may further include a planetary carrier bearing 16, through which the planetary carrier 15 is radially and axially positioned to ensure smooth torque output.

[0092] In some embodiments, the braking device 300 further includes a force sensor 7 and a thrust needle roller bearing 8, which are coaxially mounted on the first rotating member 2 and overlap with the height of the first rotating member 2 in the axial direction, thereby reducing the axial dimension of the overall structure.

[0093] In some embodiments, the braking device 300 further includes an elastic reset member 61, which is connected between the first rotating member 2 and the second rotating member 3.

[0094] When the braking device 300 is in a non-braking state, the elastic reset member 61 can maintain the first rotating member 2 and the second rotating member 3 in a preset initial relative position, ensuring that the pushing member 5 is located in the first position 21 of the mating surface. When the first rotating member 2 starts to rotate in the first direction, the first rotating member 2 can compress the elastic reset member 61 to store elastic potential energy. When the brake is engaged and the rotary drive assembly 1 stops outputting power, the elastic reset member 61 releases the elastic potential energy, driving the first rotating member 2 and the second rotating member 3 to return to their original positions, and the pushing member 5 returns to the first position 21, preparing for the next braking.

[0095] With the elastic reset member 61, the braking device 300 can have the functions of automatic return and pre-positioning, ensuring that the braking action can be repeated cyclically.

[0096] In some embodiments, the braking device 300 further includes an open retaining ring 62, which is arranged axially with the elastic reset member 61 and fixedly connected to the second rotating member 3 to limit the elastic reset member 61 between the first rotating member 2 and the second rotating member 3, and to apply a preload force to the first rotating member 2 and the pushing member 5.

[0097] This design prevents the actuator from shifting position due to vibration, thus ensuring the reliability of the braking process. Simultaneously, the elastic reset component 61 compensates for machining errors in axially related parts, improving assembly adaptability and operational stability.

[0098] The braking device 300 provided in this application embodiment, when the vehicle 1000 needs to brake, the first rotating member 2 rotates along a first direction, and pushes the second rotating member 3 through the driving push member 5, causing it to tend to rotate along the first direction. Since the ratchet 31 on the second rotating member 3 engages with the pawl structure on the piston 4, the rotation of the second rotating member 3 is restricted, thereby converting it into axial translation, which in turn pushes the piston 4 toward the brake disc to achieve braking. During this process, the elastic reset member 61 is compressed to store elastic potential energy.

[0099] When the first rotating member 2 rotates in the second direction, the thrust acting on the driving push member 5 is released. The piston 4, the second rotating member 3, and the steel ball are reset upward under the elastic force released by the elastic reset member 61, and the brake is released accordingly.

[0100] After the brake is released, if clearance adjustment is required, the first rotating member 2 will continue to rotate in the second direction. When the driving push member 5 moves to abut against the circumferential stop of the first rotating member 2, the rotational torque of the first rotating member 2 will be transmitted to the second rotating member 3 through the push member 5, causing it to rotate together in the second direction. At this time, since the ratchet 31 of the second rotating member 3 is in the free direction, its rotation is not restricted by the locking member. Since the piston 4 is fixed to the friction plate and cannot rotate, relative rotation occurs between the second rotating member 3 and the piston 4, thereby achieving automatic compensation of axial displacement to adapt to the clearance changes caused by friction plate wear.

[0101] The braking device 300 provided in this application adopts a stroke nesting design, embedding the braking extension stroke within the axial space of the clearance adjustment stroke, enabling the two major functional areas to achieve axial co-positioning, thereby ensuring the required working stroke while compressing the axial dimension. Based on this compact space, this application further utilizes the synergistic effect of the mating groove and the limiting structure to enable the single rotary drive component 1 to orderly and reliably realize the three core functions of basic braking, stable parking, and automatic clearance compensation within the integrated rotary device.

[0102] In this way, the braking device 300 can overcome the axial dimension bottleneck caused by the functional separation and spatial superposition of traditional mechanisms, achieving a balance between large stroke and low axial space. Furthermore, the braking device 300 highly integrates multiple functions into a single actuation system, eliminating redundant drive sources and clutch devices, thereby simplifying the system architecture from the source and significantly improving the functional density, reliability, and economy of the braking device 300, which is conducive to the miniaturization and compactness of the braking device 300.

[0103] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0104] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A braking device, characterized in that, include: Rotary drive assembly (1); The first rotating component (2) is connected to the output end of the rotary drive assembly (1); The second rotating component (3) is connected to the first rotating component (2) in a transmission manner. The piston (4) is adapted to connect to the friction plate and is drively connected to the second rotating member (3). When the rotary drive assembly (1) drives the first rotating member (2) to rotate in the first direction, the first rotating member (2) drives the second rotating member (3) and the piston (4) to move towards the brake disc, so that the friction pad cooperates with the brake disc for braking; when the rotary drive assembly (1) drives the first rotating member (2) to rotate in the second direction, the first rotating member (2) drives the second rotating member (3) to rotate relative to the piston (4) in the second direction, and causes the piston (4) to move relative to the second rotating member (3) towards the brake disc; Wherein, the first direction is opposite to the second direction.

2. The braking device according to claim 1, characterized in that, One of the first rotating member (2) and the second rotating member (3) is provided with a pusher (5), and the other is provided with a mating surface. The mating surface mates with the pusher (5), and the mating surface includes a first position (21) and a second position (22) arranged circumferentially along the other. The distances from the first position (21) and the second position (22) to the brake disc are different. When the rotary drive assembly (1) drives the first rotating member (2) to rotate in the first direction, the pusher (5) moves from the first position (21) to the second position (22) along the mating surface, so as to drive the whole consisting of the second rotating member (3) and the piston (4) to move closer to the brake disc.

3. The braking device according to claim 2, characterized in that, The pusher (5) is a ball bearing; One of the first rotating member (2) and the second rotating member (3) is provided with a concave ball groove, and a portion of the ball is accommodated in the concave ball groove; And / or, the other of the first rotating member (2) and the second rotating member (3) is provided with a mating groove, a portion of the ball is accommodated in the mating groove, and the bottom surface of the mating groove forms the mating surface; And / or, the braking device further includes a retainer (51) located between the first rotating member (2) and the second rotating member (3), wherein the ball is disposed in the retainer (51).

4. The braking device according to claim 2, characterized in that, The mating surface also includes a third position (23) along the circumference of the other, the third position (23) being located on the side of the first position (21) opposite to the second position (22), and the third position (23) being provided with a circumferential stop. When the rotary drive assembly (1) drives the first rotating member (2) to rotate in the second direction, the pusher (5) moves from the first position (21) to the third position (23) along the mating surface, so that the pusher (5) cooperates with the circumferential stop and drives the second rotating member (3) to rotate relative to the piston (4) in the second direction.

5. The braking device according to claim 4, characterized in that, The third position (23) is spaced apart from the first position (21), and the distances from the first position (21) and the third position (23) to the brake disc are different; And / or, the other of the first rotating member (2) and the second rotating member (3) is provided with a mating groove, the sidewall of the mating groove forms the circumferential stop, and the bottom surface of the mating groove forms the mating surface.

6. The braking device according to any one of claims 1-5, characterized in that, Also includes: A limiting structure is connected to the second rotating member (3) to allow the second rotating member (3) to rotate in the second direction and prevent the second rotating member (3) from rotating in the first direction.

7. The braking device according to claim 6, characterized in that, The limiting structure includes a ratchet (31) and a pawl structure, one of which is located on the second rotating member (3) and the other is located on the piston (4).

8. The braking device according to claim 1, characterized in that, It also includes an elastic reset member (61), which is connected between the first rotating member (2) and the second rotating member (3).

9. The braking device according to claim 1, characterized in that, One of the second rotating member (3) and the piston (4) is provided with a screw hole, and the other includes a screw rod, which is threaded into the screw hole; when the second rotating member (3) rotates relative to the piston (4) in the second direction, the piston (4) moves relative to the second rotating member (3) towards the brake disc by means of the screw hole and the screw rod. And / or, the rotary drive assembly (1) includes a rotary drive member and a deceleration assembly, the rotary drive member being disposed around the periphery of the deceleration assembly.

10. A vehicle, characterized in that, Includes the braking device (300) as described in any one of claims 1-9.

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