Compact type running and parking integrated electronic mechanical braking mechanism

Abstract

The utility model relates to a compact type running and parking integrated electronic mechanical braking mechanism, and belongs to the technical field of braking equipment. Comprising a mounting frame, a brake assembly and a brake caliper body assembly, and the brake assembly comprises a service brake unit and a parking brake unit; the service braking unit comprises a braking motor and a reduction gear set; the brake caliper body assembly is provided with a brake caliper body, the brake caliper body is slidably installed on the installation frame, and one end of the brake caliper body is connected with the power end of the brake motor through a reduction gear set. The parking braking unit comprises a parking motor, a ratchet wheel and a pawl; the ratchet wheel is connected with the reduction gear set, the pawl is connected with the power end of the parking motor, and a buffering piece is arranged between the pawl and the power end of the parking motor and used for forming flexible connection between the pawl and the power end of the parking motor when the ratchet wheel is locked by the pawl and fails. Flexible connection is formed between the pawl and the power end of the parking motor, the parking stability is improved, frictional wear between parts is reduced, and the service life of the mechanism is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of brake equipment, in particular to a compact traveling and stopping integrated electronic mechanical brake mechanism. Background Art

[0002] New energy vehicles are rapidly developing toward intelligent and unmanned driving. Brake-by-wire technology, with its advantages such as rapid braking force response and ease of modular integration with other control systems, aligns well with this development trend. Existing brake-by-wire technologies primarily include electronic hydraulic braking (EHB) and electromechanical braking (EMB). EHB, due to its use of the hydraulic circuit of traditional automotive hydraulic brake systems, suffers from numerous hydraulic lines, a complex structure, and relatively long braking response times. EMB, on the other hand, replaces hydraulic systems with electromechanical systems as the power source. It offers a simpler structure, faster response, more precise control, and complete decoupling of braking force from brake pedal force, earning it the title of the ultimate brake-by-wire technology.

[0003] Research on EMB began in the 1990s, but it has not been widely applied due to bottlenecks in motor drive control technology and restrictions on relevant regulations. With the development of electric drive technology and the technical demand for new energy vehicles, major domestic and foreign automotive parts suppliers, universities, research institutions, etc. have begun related research. All parties believe that EMB technology has broad market prospects.

[0004] The operating principles of EMB transmission mechanisms from various manufacturers are generally similar, primarily consisting of a drive motor, a deceleration and gain mechanism, and a motion conversion mechanism. The deceleration and gain mechanism is primarily a gear transmission mechanism, though some also employ a wedge-type force amplifier or lever mechanism. The motion conversion mechanism typically uses a ball screw to convert rotational motion into translational motion for clamping. Besides driving braking, the braking system also needs to consider parking. Existing parking mechanisms mostly utilize locking mechanisms such as ratchets or hooks. The hooks are controlled by an actuator to lock and release the hooks. When parking is required, the mechanism first clamps according to the target braking force and then locks. However, the actuators of these mechanisms are in direct, rigid contact with the ratchet and other force-bearing components used during parking. If the hooks do not engage the ratchet groove, parking may fail. Furthermore, the hooks are subject to the braking reaction force, resulting in high friction and severe component wear when the brakes need to be released. Furthermore, existing EMB transmission mechanisms have large axial dimensions, resulting in limited installation space at the wheel, which affects front wheel steering performance. Furthermore, the larger size of the parking mechanism further limits its application. Therefore, a compact electronic mechanical brake mechanism with integrated driving and parking function is needed to solve the problem that the existing electronic mechanical brake mechanism adopts a ratchet parking method, has a rigid connection between the power part and the ratchet, resulting in large component wear, large axial size of the mechanism, and limited installation space. Utility Model Content

[0005] The purpose of the present invention is to provide a compact electronic mechanical brake mechanism with integrated travel and parking function to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a compact driving and parking integrated electronic mechanical brake mechanism, comprising a mounting frame, a brake assembly and a brake caliper assembly, the brake assembly comprising a driving brake unit and a parking brake unit; the driving brake unit comprises a brake motor and a reduction gear set; the brake caliper assembly is provided with a brake caliper body, the brake caliper body is slidably mounted on the mounting frame, and one end thereof is connected to the power end of the brake motor through the reduction gear set; the parking brake unit comprises a parking motor, a ratchet and a pawl; the ratchet is connected to the reduction gear set, the pawl is connected to the power end of the parking motor, and a buffer is provided between the pawl and the power end of the parking motor, which is used to form a flexible connection between the pawl and the power end of the parking motor when the pawl locking ratchet fails.

[0007] Preferably, the brake caliper body assembly includes a slide rail and a ball screw pair; the slide rail is installed on the mounting frame, the brake caliper body is slidably installed on the slide rail, and one end of it is connected to the nut end of the ball screw pair, the screw of the ball screw pair is rotatably installed on the mounting frame, and one end of it is connected to the power output end of the reduction gear set.

[0008] Preferably, the reduction gear set includes a driving gear, an output gear and several idle gears; the driving gear is fixedly connected to the power end of the brake motor, the output gear is installed on the screw of the ball screw pair, and the driving gear and the output gear are connected by meshing with each other through several idle gears.

[0009] Preferably, a plurality of idler gears are provided with a double gear for connecting the driving gear or the idler gear or the output gear located in different planes; the double gear includes a first gear and a second gear that are integrally formed and coaxially arranged, the first gear is engaged with the driving gear or the adjacent idler gear to form a power input end, and the second gear is engaged with the output gear or the adjacent idler gear to form a power output end.

[0010] Preferably, the ratchet is fixedly mounted on the power end of the brake motor; a mounting hole is provided in the middle of the ratchet, and the ratchet is interference mounted on the power end of the brake motor through the mounting hole.

[0011] Preferably, the parking brake unit is provided with a mounting guide sleeve, and the parking motor is provided with a telescopic extending shaft to constitute a power end; the mounting guide sleeve is fixedly mounted on the mounting frame, and the mounting guide sleeve is provided with a mounting through hole, the pawl is slidably mounted in the mounting through hole, and one end thereof is connected to the extending shaft through a buffer member, and the other end extends to the outside of the mounting through hole to form a locking end.

[0012] Preferably, the shape of the mounting through hole of the mounting guide sleeve is adapted to the shape of the pawl; the buffer member includes a lock tongue and a spring; one end of the lock tongue is connected to the protruding shaft of the parking motor, and the other end is provided with a columnar mounting rod; the pawl body of the pawl is provided with a mounting groove, and the outer side of the mounting rod of the lock tongue is provided with a spring, and the pawl is sleeved on the mounting rod through the mounting groove, and is slidably installed on the mounting rod by abutting against the spring.

[0013] Preferably, the bottom of the mounting rod of the lock tongue protrudes radially outward to form a boss, and a pin hole perpendicular to the rod body is provided on the rod body near the top of the mounting rod; a strip-shaped limit groove is provided in the mounting groove of the pawl and the groove corresponding to the pin hole of the mounting rod along the sliding direction of the pawl; a limit pin is installed in the pin hole of the mounting rod, and the two ends of the limit pin extend to the outside of the pin hole respectively to form limit ends on both sides; when the pawl is slidably installed on the mounting rod, the limit ends on both sides of the limit pin are slidably installed in the strip-shaped limit groove of the pawl to limit the sliding stroke of the pawl; the spring is sleeved on the outside of the mounting rod, one side of which is against the pawl, and the other end is against the boss of the mounting rod.

[0014] Preferably, a plurality of ratchet gears are evenly spaced on the outer side of the ratchet wheel surface, and a ratchet groove is formed between two adjacent ratchet gears; the body of the ratchet gear is provided with tooth surfaces on both sides, one side of the tooth surfaces on both sides is a plane structure perpendicular to the ratchet wheel surface, and the other side of the tooth surface is an arc-shaped structure from the tooth root to the tooth top; the locking end of the pawl is a gear structure adapted to the ratchet gear; the gear structure of the locking end is provided with locking tooth surfaces on both sides and locking tooth top surfaces, and one side of the tooth surfaces on both sides is a plane structure perpendicular to the pawl. The locking tooth surface of the pawl is an arc-shaped structure from the tooth root to the tooth top; when the pawl locks the ratchet, the locking tooth top surface of the pawl is abutted against the bottom of the ratchet groove, and the locking tooth surface of the plane structure of the locking end is abutted against the tooth surface of the plane structure of the ratchet gear to limit the rotational movement of the ratchet along the brake release direction. When the locking tooth top surface of the pawl is abutted against the tooth top of the ratchet gear, the ratchet rotates in the brake release direction to drive the locking tooth top surface of the pawl to slide along the tooth surface of the arc-shaped structure of the ratchet gear.

[0015] Preferably, the brake assembly is provided with an electronic control unit and a pressure sensor, the brake motor and the sensor are electrically connected to the electronic control unit respectively, the pressure sensor is mounted on the screw shaft of the ball screw pair, one side of the sensing end is in contact with the end face of the screw shaft, and the other side is in contact with the brake caliper body to detect the brake clamping force; the width dimension of the ratchet groove is larger than the width dimension of the pawl locking end. Beneficial effects

[0016] The electronic mechanical brake mechanism of the present invention comprises a brake assembly and a brake caliper assembly. The brake assembly includes a service brake unit and a parking brake unit, and the service brake unit includes a brake motor and a reduction gear set. The brake caliper assembly comprises a brake caliper body, which is slidably mounted on a mounting frame and one end of which is connected to the power end of the brake motor via a reduction gear set. This allows power output from the power end of the brake motor. After deceleration and amplification by the reduction gear set, the braking force of the brake motor is increased, thereby driving the brake caliper body to slide along the mounting frame toward the brake disc, thereby achieving service braking. The parking brake unit comprises a parking motor, a ratchet, and a pawl. The ratchet is connected to the reduction gear set, and the pawl is driven by the power end of the parking motor to lock the ratchet, thereby achieving the parking brake effect. The utility model provides a buffer between the power end of the parking motor and the pawl. This allows for a flexible connection between the pawl and the power end of the parking motor when the pawl fails to lock the ratchet. This prevents the power end of the parking motor from directly bearing the reaction force of the brake. This reduces friction between the pawl and the ratchet when the brake needs to be released, reducing wear on components. The flexible connection between the pawl and the power end of the parking motor improves parking stability, reduces friction and wear between components, and extends the service life of the mechanism.

[0017] Building on the aforementioned, the present invention's reduction gear set includes a driving gear, an output gear, and several idler gears. The driving gear is fixedly connected to the power end of the brake motor, while the output gear is mounted on the lead screw of the ball screw pair. The driving and output gears are connected by a meshing connection of several idler gears. This invention utilizes multi-stage parallel axis gears for reduction transmission. Compared to planetary gear systems, this reduces the axial dimensions of the mechanism while meeting the required transmission ratio. This results in a compact and simple structure, easy assembly and disassembly for maintenance, and avoids interference with existing vehicle chassis space.

[0018] Building on the above, the present invention incorporates a number of idler gears with dual gears for connecting driving gears, idler gears, or output gears located on different planes. This creates a multi-layered planar meshing structure between the various gears of the reduction gears, further reducing component installation space and improving component compactness. This also shortens the center distance between the driving gear and the output gear, reducing braking force loss and maximizing the stable transmission of braking torque.

[0019] The parking motor of the present invention is provided with a telescopic extension shaft, and a pawl is mounted on the extension shaft via a buffer. The parking brake unit of the present invention is provided with a mounting guide sleeve, which has a mounting through-hole. The pawl is slidably mounted in the mounting through-hole, and one end of the pawl extends outside the mounting through-hole to form a locking end. After the parking brake is applied, the reaction force caused by the clamping force of the brake caliper body is reversely transmitted to the power end of the brake motor and then to the ratchet through the reduction gear set. Therefore, the locking end of the pawl will bear the tangential force brought by the ratchet. Since the locking end is slidably mounted in the mounting through-hole of the mounting guide sleeve, the outer wall of the locking end will always be in contact with the hole wall of the mounting through-hole. The mounting guide sleeve is mounted on the mounting frame and will ultimately transmit this tangential force to the mounting frame. Therefore, the extension shaft of the parking motor is no longer subjected to any external force except the elastic force of the buffer in the axial direction, thereby ensuring the smoothness and reliability of its axial movement.

[0020] Based on the above, the buffer member of the present invention includes a lock tongue and a spring; one end of the lock tongue is connected to the extended shaft of the parking motor, and the other end is provided with a columnar mounting rod; the pawl body of the pawl is provided with a mounting groove, and the outer side of the lock tongue mounting rod is provided with a spring. The pawl is mounted on the mounting rod through the mounting groove and slides onto the mounting rod against the spring. In addition, the mounting rod of the lock tongue of the present invention is provided with a pin hole for installing a limit pin, and the bottom of the mounting rod is provided with a boss. By providing a strip-shaped limit groove in the pawl mounting groove, the pawl is slidably mounted on the mounting rod of the lock tongue under the restraining action of the limit pin. When the parking brake is applied, if the locking end of the pawl is not locked in the gear groove of the ratchet wheel, the locking end will collide with the tooth top of the ratchet gear, at which time the locking end will compress the spring. Due to the buffering effect of the spring, direct rigid contact between the extended shaft of the parking motor and the ratchet wheel is avoided, thereby preventing jamming and damage between the components of the parking brake unit.

[0021] Based on the above, the outer wheel surface of the ratchet wheel of the present invention is uniformly distributed with ratchet gears, and ratchet grooves are formed between adjacent ratchet gears. The tooth surfaces on both sides of the ratchet gear body are configured as a flat structure and an arcuate structure. The locking end of the pawl of the present invention adopts a gear structure compatible with the ratchet gear. The locking tooth surfaces on both sides of the gear structure of the locking end are configured as a flat structure and an arcuate structure. When the vehicle is parked, the locking end abuts against the ratchet groove of the ratchet wheel, and the locking tooth surfaces of the flat structure of the locking end abut against the tooth surfaces of the flat structure of the ratchet gear, thereby limiting the rotational movement of the ratchet wheel in the first direction. When the brake fails, the top surface of the locking tooth of the pawl will rest against the top of the ratchet gear tooth, and the parking motor will be driven by the control unit to lock the parking again. At this time, the brake motor drives the ratchet to rotate in the braking direction to drive the top surface of the locking tooth of the pawl to slide along the tooth surface of the ratchet gear to the bottom of the ratchet groove until the parking brake is completed. During this process, the locking end of the pawl is always in contact with the tooth surface of the ratchet gear under the action of the spring, preventing the locking end from quickly hitting the ratchet groove from the top of the ratchet gear tooth, and the arc-shaped locking tooth surface of the locking end of the pawl and the arc-shaped tooth surface of the ratchet gear can make the brake motor rotate stably under the action of the specified torque and spring force, ensuring the stable operation of the parking brake components and reducing damage to the components due to abnormal impact.

[0022] Based on the above, the parking brake unit of the present invention is provided with an electronic control unit and a sensor. The brake motor and pressure sensor are electrically connected to the electronic control unit. The pressure sensor is mounted on the screw shaft of the ball screw pair. One side of its sensing end contacts the end face of the screw shaft, and the other side contacts the brake caliper body to detect the brake clamping force. The electronic control unit detects the ratio between the actual parking brake force and the target parking brake force. If the actual parking brake force is detected to be too large, the electronic control unit will determine that the parking has failed and will perform parking again to confirm that the locking end of the pawl is resting in the ratchet groove. The width of the ratchet groove of the present invention is larger than the width of the locking end of the pawl. When the parking is released, the brake motor rotates a small angle in the braking direction to eliminate the tangential force borne by the locking end and reduce friction when the locking end retracts. After turning a small angle, since the width of the ratchet groove is greater than the locking end, the locking end is still in the ratchet groove, ensuring that the vehicle can still be locked in the event of an accident, thereby ensuring parking safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of the brake assembly of the compact walking-station integrated electro-mechanical brake mechanism of the embodiment;

[0024] Figure 2 An exploded view of the structure of the brake assembly of the compact travel-station integrated electro-mechanical brake mechanism of the embodiment;

[0025] Figure 31. It is a structural exploded view of the parking brake unit of the compact parking-integrated electronic brake mechanism of the embodiment;

[0026] Figure 4 Schematic diagram of the structure of the parking brake unit of the compact driving and parking integrated electronic mechanical brake mechanism of the embodiment. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments. For the sake of clarity, the brake motor of the present embodiment is engaged when it rotates clockwise, and is released when it rotates counterclockwise.

[0028] See also Figures 1-4 The present embodiment provides a compact driving and parking integrated electronic mechanical brake mechanism, comprising a mounting frame, a brake assembly 1 and a brake caliper assembly (not shown), the brake assembly comprising a driving brake unit and a parking brake unit; the driving brake unit comprises a brake motor 1-1 and a reduction gear set 1-3; the brake caliper assembly is provided with a brake caliper body, the brake caliper body is slidably mounted on the mounting frame, and one end thereof is connected to the power end of the brake motor through the reduction gear set; the parking brake unit comprises a parking motor 1-2, a ratchet 1-208 and a pawl 1-207; the ratchet 1-208 is connected to the reduction gear set 1-3, the pawl is connected to the power end of the parking motor, and a buffer is provided between the pawl and the power end of the parking motor, for forming a flexible connection between the pawl and the power end of the parking motor when the pawl locks the ratchet and fails.

[0029] The brake caliper body assembly of this embodiment includes a slide rail (not shown) and a ball screw pair (only the screw is shown); the slide rail is installed on the mounting frame, the brake caliper body (not shown) is slidably installed on the slide rail, and one end of it is connected to the nut end of the ball screw pair, and the screw 1-4 of the ball screw pair is rotatably installed on the mounting frame, and one end of it is connected to the power output end of the reduction gear set.

[0030] The reduction gear set 1-3 of this embodiment includes a driving gear 1-301, an output gear 1-304, and two idler gears. The driving gear 1-301 is fixedly connected to the power end 1-102 of the brake motor 1-1, and torque is transmitted through the axial surface 1-101 of the power end. The output gear 1-304 is mounted on the external spline at the end of the ball screw 1-4 by providing an internal spline 1-305, and the driving gear and the output gear are connected by two idler gears that mesh with each other. The two idler gears are provided with a double gear 1-302, which is combined with the driving gear 1-301 of the brake motor and is used to connect the idler gears located on different planes from the driving gear. The double gears include a first gear and a second gear that are integrally formed and arranged coaxially. The first gear meshes with the driving gear 1-301 to form the power input end, and the second gear meshes with the adjacent idler gear 1-303 to form the power output end. The output gear meshes with the adjacent idler gear. The ratchet 1-208 of this embodiment is fixedly mounted on the power end 1-102 of the brake motor; a mounting hole is provided in the middle of the ratchet, and the ratchet 1-208 is interference mounted on the power end of the brake motor through the mounting hole.

[0031] Furthermore, the parking brake unit of this embodiment is provided with a mounting guide sleeve 1-206, and the parking motor 1-2 is provided with a telescopic extension shaft 1-202 to constitute a power end; the mounting guide sleeve 1-206 is fixedly installed on the mounting frame, and the mounting guide sleeve is provided with a mounting through hole, and the pawl 1-207 is slidably installed in the mounting through hole, and one end thereof is connected to the extension shaft 1-202 through a buffer member, and the other end extends to the outside of the mounting through hole to form a locking end 1-216. The shape of the mounting through hole of the mounting guide sleeve 1-206 of this embodiment is adapted to the shape of the pawl, and the outer side wall 1-209 of the pawl fits into the hole wall of the mounting through hole; the buffer member includes a lock tongue 1-204 and a spring 1-203; one end of the lock tongue 1-204 is connected to the protruding shaft 1-202 of the parking motor, and the other end is provided with a columnar mounting rod; the pawl body of the pawl is provided with a mounting groove, and the outer side of the mounting rod of the lock tongue is provided with a spring, and the pawl is sleeved on the mounting rod through the mounting groove, and is slidably installed on the mounting rod by abutting against the spring. Specifically, the bottom of the mounting rod protrudes radially outward to form a boss, and a pin hole perpendicular to the rod body is provided on the rod body near the top of the mounting rod; a strip-shaped limit groove is provided in the mounting groove of the pawl corresponding to the pin hole of the mounting rod along the sliding direction of the pawl; a limit pin 1-205 is installed in the pin hole of the mounting rod, and the two ends of the limit pin extend to the outside of the pin hole respectively to form limit ends on both sides; when the pawl is slidably installed on the mounting rod, the limit ends on both sides of the limit pin are slidably installed in the strip-shaped limit groove 1-210 of the pawl to limit the sliding stroke of the pawl; the spring 1-203 is sleeved on the outside of the mounting rod, one side of which is stopped at the pawl 1-207, and the other end is stopped at the boss of the mounting rod.

[0032] In addition, a number of ratchet gears are evenly spaced on the outer side of the ratchet wheel surface of this embodiment, and a ratchet groove 1-212 is formed between two adjacent ratchet gears; the body of the ratchet gear is provided with tooth surfaces and tooth top surfaces 1-214 on both sides, and the tooth surface 1-211 on one side of the tooth surface is a plane structure perpendicular to the ratchet wheel surface, and the tooth surface 1-213 on the other side is an arc-shaped structure from the tooth root to the tooth top; the locking end 1-216 of the pawl is a gear structure adapted to the ratchet gear; the locking end The gear structure is provided with locking tooth surfaces and locking tooth top surfaces 1-217 on both sides. The tooth surface 1-215 on one side of the locking tooth surfaces on both sides is a planar structure perpendicular to the pawl, and the locking tooth surface 1-218 on the other side is an arc-shaped structure from the tooth root to the tooth top; when the pawl locks the ratchet, the locking tooth top surface of the pawl stops at the bottom of the ratchet groove, and the locking tooth surface of the planar structure of the locking end is pressed against the tooth surface of the planar structure of the ratchet gear to limit the rotational movement of the ratchet along the brake release direction.

[0033] Furthermore, the brake assembly of this embodiment is provided with an electronic control unit and a pressure sensor. The brake motor and the pressure sensor are electrically connected to the electronic control unit respectively. The pressure sensor is mounted on the screw shaft of the ball screw pair. One side of its sensing end contacts the end face of the screw shaft, and the other side contacts the brake caliper body to detect the brake clamping force; the width dimension of the ratchet groove is larger than the width dimension of the pawl locking end.

[0034] Working principle: When the compact driving and parking integrated electronic mechanical brake mechanism of this embodiment is in use, when the vehicle is driving, the brake motor and the parking motor are in the inactive state, and the extended shaft of the parking motor is in the retracted position, so as to drive the pawl to the retracted position, and the locking end of the pawl has no contact with the ratchet.

[0035] During service braking, the brake motor starts, and the power end drives the driving gear to rotate, which in turn drives the double gear to transmit the braking force of the brake motor to the output gear through the idler gear, thereby driving the screw of the ball screw pair to rotate, driving the nut end to slide along the screw, and finally driving the brake caliper body to slide along the slide rail toward the brake disc to brake and decelerate.

[0036] After the service brake is applied and the vehicle is stopped, if the parking brake is required, the electronic control unit controls the parking motor to activate, thereby driving the extension shaft of the parking motor to extend, causing the pawl on the lock tongue to extend toward the ratchet wheel until the locking tooth top surface of the locking end of the pawl abuts the ratchet groove of the ratchet wheel. Simultaneously, the locking tooth surface of the flat structure of the locking end of the pawl abuts the tooth surface of the flat structure of the ratchet gear of the ratchet wheel, thereby locking the ratchet wheel and restricting the ratchet wheel from rotating counterclockwise. It should be noted that if the locking end of the pawl does not abut the ratchet groove of the ratchet wheel when extended, but instead abuts the tooth top surface 1-214 of the ratchet gear, the extension shaft of the parking motor continues to extend, the pawl will compress the spring, and drive the mounting rod of the lock tongue to slide along the pawl mounting groove. At this time, the sensor on the extension shaft will detect that the actual parking clamping force increases until it exceeds the target parking clamping force. The electronic control unit will determine that the parking state has failed and will then re-park the vehicle, driving the brake motor to rotate clockwise to apply the brake. As the power end of the brake motor rotates, the ratchet rotates clockwise, driving the locking end of the pawl to slide along the tooth top surface of the ratchet gear toward the ratchet groove until the pawl slides into the ratchet groove and stops on the tooth surface of the planar structure of the ratchet gear, completing the parking brake.

[0037] Furthermore, when the parking brake needs to be released, the brake motor first rotates slightly clockwise to eliminate the tangential force exerted by the ratchet on the locking end and reduce friction when the pawl retracts. Because the ratchet slot is designed to be wider than the locking end, the locking end remains within the ratchet slot after a slight rotation of the ratchet, ensuring that the vehicle can still be locked in the event of an unexpected situation, ensuring parking safety.

[0038] As above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes in form and details may be made without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A compact, integrated electromechanical brake mechanism comprising a mounting frame, a brake assembly, and a brake caliper assembly, characterized in that: The brake assembly includes a service brake unit and a parking brake unit; the service brake unit includes a brake motor and a reduction gear set; the brake caliper assembly is provided with a brake caliper body, which is slidably mounted on a mounting frame, and one end of which is connected to the power end of the brake motor through a reduction gear set; the parking brake unit includes a parking motor, a ratchet and a pawl; the ratchet is connected to the reduction gear set, the pawl is connected to the power end of the parking motor, and a buffer is provided between the pawl and the power end of the parking motor.

2. The compact electromechanical brake mechanism according to claim 1, characterized in that: The brake caliper body assembly includes a slide rail and a ball screw pair; the slide rail is installed on the mounting frame, the brake caliper body is slidably installed on the slide rail, and one end of it is connected to the nut end of the ball screw pair, the screw of the ball screw pair is rotatably installed on the mounting frame, and one end of it is connected to the power output end of the reduction gear set.

3. The compact electromechanical brake mechanism according to claim 1, characterized in that: The reduction gear set includes a driving gear, an output gear and several idle gears; the driving gear is fixedly connected to the power end of the brake motor, the output gear is installed on the screw of the ball screw pair, and the driving gear and the output gear are connected by meshing with each other through several idle gears.

4. The compact electromechanical brake mechanism according to claim 3, characterized in that: Several of the idler gears are provided with double gears for connecting the driving gear or idler gear or output gear located in different planes; the double gears include a first gear and a second gear that are integrally formed and coaxially arranged, the first gear is engaged with the driving gear or the adjacent idler gear to form a power input end, and the second gear is engaged with the output gear or the adjacent idler gear to form a power output end.

5. The compact electromechanical brake mechanism according to claim 3, characterized in that: The ratchet is fixedly mounted on the power end of the brake motor; a mounting hole is provided in the middle of the ratchet, and the ratchet is interference mounted on the power end of the brake motor through the mounting hole.

6. The compact electromechanical brake mechanism according to claim 2, characterized in that: The parking brake unit is provided with a mounting guide sleeve, and the parking motor is provided with a telescopic extension shaft to constitute a power end; the mounting guide sleeve is fixedly installed on the mounting frame, and the mounting guide sleeve is provided with a mounting through hole, and the pawl is slidably installed in the mounting through hole, and one end of the pawl is connected to the extension shaft through a buffer member, and the other end extends to the outside of the mounting through hole to form a locking end.

7. The compact electromechanical brake mechanism according to claim 6, characterized in that: The shape of the mounting through hole of the mounting guide sleeve is adapted to the shape of the pawl; the buffer component includes a lock tongue and a spring; one end of the lock tongue is connected to the extended shaft of the parking motor, and the other end is provided with a columnar mounting rod; the pawl body of the pawl is provided with a mounting groove, and the spring is sleeved on the outer side of the mounting rod of the lock tongue, and the pawl is sleeved on the mounting rod through the mounting groove, and is slidably mounted on the mounting rod by abutting against the spring.

8. The compact electromechanical brake mechanism according to claim 7, characterized in that: The bottom of the mounting rod of the lock tongue protrudes radially outward to form a boss, and a pin hole perpendicular to the rod body is provided on the rod body near the top of the mounting rod; a strip-shaped limit groove is provided in the mounting groove of the pawl corresponding to the pin hole of the mounting rod along the sliding direction of the pawl; a limit pin is installed in the pin hole of the mounting rod, and the two ends of the limit pin extend to the outside of the pin hole respectively to form limit ends on both sides; when the pawl is slidably installed on the mounting rod, the limit ends on both sides of the limit pin are slidably installed in the strip-shaped limit groove of the pawl to limit the sliding stroke of the pawl; the spring is sleeved on the outside of the mounting rod, with one side resting on the pawl and the other end resting on the boss of the mounting rod.

9. The compact electromechanical brake mechanism according to claim 6, characterized in that: The outer side of the ratchet wheel surface is evenly spaced with a number of ratchet gears, and a ratchet groove is formed between two adjacent ratchet gears; the body of the ratchet gear is provided with tooth surfaces on both sides, one side of the tooth surfaces on both sides is a plane structure perpendicular to the ratchet wheel surface, and the other side of the tooth surface is an arc-shaped structure from the tooth root to the tooth top; the locking end of the pawl is a gear structure adapted to the ratchet gear; the gear structure of the locking end is provided with locking tooth surfaces on both sides and locking tooth top surfaces, and ... the tooth surfaces on one side of the locking tooth surfaces on both sides are perpendicular to the pawl. A planar structure, and the locking tooth surface on the other side is an arc-shaped structure from the tooth root to the tooth top; when the pawl locks the ratchet, the locking tooth top surface of the pawl abuts against the bottom of the ratchet groove, and the locking tooth surface of the planar structure of the locking end abuts against the tooth surface of the planar structure of the ratchet gear to limit the rotational movement of the ratchet along the brake release direction. When the locking tooth top surface of the pawl abuts against the tooth top of the ratchet gear, the ratchet rotates in the braking direction to drive the locking tooth top surface of the pawl to slide along the tooth surface of the arc-shaped structure of the ratchet gear.

10. The compact electromechanical brake mechanism according to claim 9, characterized in that: The brake assembly is provided with an electronic control unit and a pressure sensor. The brake motor and sensor are electrically connected to the electronic control unit respectively. The pressure sensor is sleeved on the screw shaft of the ball screw pair. One side of its sensing end contacts the end face of the screw shaft, and the other side contacts the brake caliper body to detect the parking clamping force; the width dimension of the ratchet groove is larger than the width dimension of the pawl locking end.

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