Electronic parking mechanism and electronic mechanical brake

Abstract

The utility model discloses an electronic parking mechanism which is installed in a machine shell and comprises a parking motor, a motor base and a driving device. The worm is connected with the parking motor and is driven by the parking motor; the worm gear is meshed with the worm and is driven by the worm, and a threaded hole is formed in the center of the worm gear in the axial direction of the worm gear; the screw assembly comprises a screw, a pawl and a ratchet wheel matched with the pawl; the screw is in threaded connection with a threaded hole in the center of the worm gear, and the worm can move in the axial direction of the center of the worm gear, so that the pawl abuts against or is separated from the ratchet wheel; the braking device is connected with the ratchet wheel and abuts against or is separated from the ratchet wheel through a pawl; and parking braking or releasing is carried out. The utility model further discloses an electronic mechanical brake provided with the electronic parking mechanism. According to the mechanism, the ratchet wheel and the pawl are driven by the parking motor to achieve parking, the structure is stable and reliable and is not affected by vibration, the problems existing in an existing electromagnet parking mechanism are effectively solved, and the safety and efficiency of an EMB parking system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile electronic control, in particular to an electronic parking mechanism, and also to an electronic mechanical brake using the electronic parking mechanism. Background Art

[0002] With the development of automobile electronics and intelligence, EMB has gradually become an indispensable component of advanced driver assistance systems (ADAS) and autonomous driving technologies.

[0003] Electronic Mechanical Brake (EMB) is an important technology in modern automobile braking systems. It uses a motor as the driving source of the braking force, and converts the power of the motor into braking force through a mechanical transmission mechanism to clamp the vehicle's brake disc or brake drum, thereby achieving the purpose of braking. Compared with traditional hydraulic brake systems, electronic mechanical brakes have the advantages of high braking response speed, precise braking force control, better integration and scalability.

[0004] Existing electronic mechanical brake (EMB) parking mechanisms mostly use electromagnets or bistable electromagnets. These structures are prone to malfunction when subjected to vibration shock, causing the EMB to fail to brake normally, posing a safety hazard to the vehicle. In addition, it is impossible to directly determine whether the electromagnet structure is actuated after power is turned on, which increases the uncertainty of parking safety. At the same time, due to the large friction between the ratchet and the pawl when the electromagnet is released, a complex algorithm is required to control the motor to reverse, which takes a long time to respond and consumes a lot of energy.

[0005] Based on the above problems existing in the prior art, designing an electronic parking mechanism with stable structure, simple control, rapid response and low energy consumption becomes the problem to be solved by this application. Utility Model Content

[0006] One of the purposes of the utility model is to provide an electronic parking mechanism, which realizes parking by driving a ratchet pawl through a parking motor. The structure is stable and reliable and is not affected by vibration. It solves the problems existing in the existing electromagnet parking mechanism and improves the safety and efficiency of the EMB parking system.

[0007] In order to solve the above technical problems, the present application provides a parking motor of an electronic parking mechanism, which is installed in a housing and includes: a parking motor as a power driving mechanism for driving a worm gear and a worm.

[0008] The worm gear is connected to the parking motor and driven by the parking motor.

[0009] The worm wheel is meshed with the worm and driven by the worm, and a threaded hole is arranged at the center of the worm wheel along its axial direction.

[0010] The screw assembly includes a screw, a pawl, and a ratchet wheel matched with the pawl; the screw is threadedly connected to the threaded hole in the center of the worm wheel, and the worm can move along the axial direction of the center of the worm wheel, so that the pawl and the ratchet wheel abut or disengage.

[0011] The brake device is connected to the ratchet wheel, and the parking brake is applied or released by the contact or disengagement of the pawl with the ratchet wheel.

[0012] In addition to the above-mentioned technical solutions, this application also makes improvements in the following aspects:

[0013] In some embodiments, one end of the pawl is connected to the screw rod, and the other end is inserted into a limiting groove provided inside the housing to limit the circumferential rotation of the screw rod.

[0014] In some embodiments, a mounting hole is provided at one end of the screw rod connected to the pawl; the pawl is movably mounted on the mounting hole, and the pawl can move along the opening direction of the mounting hole.

[0015] In some embodiments, the screw rod is provided with a through guide groove along the radial direction of the screw rod near the opening of the mounting hole, and the guide groove passes through the mounting hole;

[0016] One end of the pawl is movably mounted on the guide groove of the screw rod through a column pin, and the column pin can slide forward and backward along the guide groove.

[0017] In some embodiments, an elastic member adapted to the mounting hole is disposed inside the mounting hole; one end of the elastic member extends into the mounting hole and abuts against the inner wall of the mounting hole, and the other end abuts against one end of the pawl inserted into the mounting hole.

[0018] In some embodiments, the parking motor drives the worm wheel to rotate through the worm, and the rotation of the worm wheel drives the screw to move linearly along the central axial direction of the worm wheel, thereby driving the pawl to move toward the ratchet wheel or in the opposite direction to perform parking braking or release parking.

[0019] In some embodiments, when parking, the pawl contacts the ratchet wheel, the parking motor is powered off, and the pawl maintains a continuous parking state under the elastic force of the elastic member.

[0020] In some embodiments, when releasing the parking, the parking motor reverses to drive the worm, worm wheel and screw to move in the opposite direction, and the pawl moves away from the ratchet wheel, and the pawl disengages from the ratchet wheel, thereby achieving parking release.

[0021] In some embodiments, the elastic member is located between the screw and the pawl. When parking, when the pawl and the ratchet are not fully matched, the elastic force of the elastic member causes the pawl to continue to move toward the ratchet to perform parking braking.

[0022] Another object of the present application is to provide an electronic mechanical brake, which is equipped with the above-mentioned electronic parking mechanism.

[0023] Beneficial effects of the utility model:

[0024] 1. This application uses a parking motor to drive the worm and worm wheel to rotate, which in turn drives the screw to move in a straight line, so that the pawl and the ratchet wheel can be matched or separated, avoiding the problem of malfunction of the electromagnet structure due to vibration, and realizing efficient parking and release functions. The structure is stable and reliable, not affected by vibration, and improves the safety of the parking system. At the same time, the parking release process does not require complex algorithm control, which further improves the response speed of parking release.

[0025] 2. In the parking process of this application, the parking motor only works when parking or parking is released, and is in a power-off state at other times. When the pawl cooperates with the ratchet wheel and parking is achieved, the parking motor can be powered off when the set torque is reached. There is no need to keep the power on, which effectively reduces energy consumption and improves the energy utilization efficiency of the equipment.

[0026] 3. In the present application, the coordination between the pawl and the ratchet is provided with elastic force by an elastic member. Even when the pawl and the ratchet are not fully coordinated, the elastic force of the spring can make the pawl continue to move toward the ratchet, thereby ensuring the reliability of the parking state.

[0027] 4. The present application adopts a worm and worm gear transmission mechanism to achieve a larger transmission ratio and self-locking function, making the parking mechanism compact, simple, easy to install and maintain.

[0028] In summary, the electronic parking mechanism of the present application and the electronic mechanical brake using the electronic parking mechanism have significant beneficial effects such as high efficiency, energy saving, reliability, simple structure, compactness and wide application. The electronic parking mechanism can be applied to various electronic mechanical brakes that require parking functions, improves the performance of the brake, and has a wide range of application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0030] Figure 1 This is a schematic diagram of the combined structure of the electronic parking mechanism, the electronic mechanical brake and the brake mechanism of the present application;

[0031] Figure 2 This is a schematic diagram of the structure of the housing of this application with a focus on the limit slot;

[0032] Figure 3 Schematic diagram of the electronic parking mechanism for this application

[0033] Figure 4 A schematic diagram of the structure of the elastic member is highlighted for this application;

[0034] Figure 5 The structural diagram of the installation slot and the limiting hole is highlighted for this application.

[0035] The numbers in the figure are as follows:

[0036] 1. Parking motor; 2. Worm; 3. Worm wheel; 4. Screw; 41. Mounting hole; 42. Guide groove; 5. Ratchet; 6. Ratchet; 7. Braking device; 8. Pin; 9. Elastic member; 10. Limiting groove. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to be any limitation on the present application and its application or use. The present application can be implemented in other different forms and is not limited to the embodiments described herein.

[0038] 1. Explanation of Descriptive Terms in This Application

[0039] The embodiments provided in this application in conjunction with the technical solutions are intended to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art. It should be noted that unless otherwise specifically stated in this application, the relative arrangement of components described in these embodiments should be interpreted as merely exemplary, and not as a limitation to the technical solutions of this application.

[0040] If the directional terms such as "upper", "lower", "left", "right", "bottom", "top" etc. are used in this application, they are defined relative to the directions in the drawings and are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. These or other directional terms should not be understood as restrictive terms.

[0041] In the present application, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0042] In addition, this application does not discuss in detail the technologies and equipment known to ordinary technicians in the relevant fields, but where appropriate, the technologies and equipment should be considered as part of the specification.

[0043] The application scenarios of this application are mainly based on the parking brake or release of the automobile electronic mechanical brake, and can also be applied to other scenarios according to its function. Its application scenarios are not restricted or limited by the specific embodiments recorded in this application.

[0044] 2. Parking mechanisms based on electronic mechanical brakes (EMBs) mostly use electromagnets or bistable electromagnets. These structures are prone to malfunction when subjected to vibration shock, resulting in the EMB being unable to brake normally, posing a safety hazard to the vehicle. The present application specifically provides a technical solution to the above problem. The technical solution, working principle and technical effect of the present application are described in detail below in conjunction with specific embodiments.

[0045] like Figure 1 As shown, the present application provides an electronic parking mechanism, which is mainly used for electronic mechanical brakes and cooperates with a brake mechanism to achieve braking or releasing.

[0046] like Figure 1 , Figure 3 The electronic parking mechanism shown specifically includes a parking motor 1 , a worm gear 3 , a worm 2 transmission mechanism, a screw 4 assembly and a braking device 7 .

[0047] The parking motor 1 is installed in the housing as a power driving mechanism, and is used to drive the worm wheel and the worm 2. The worm 2 is connected to the parking motor 1 and driven by the parking motor 1.

[0048] During operation, the parking motor 1 only works when the vehicle is parked or released, and is in a power-off state at other times.

[0049] The transmission mechanism of the electronic parking mechanism adopts a worm 2 and a worm wheel transmission. The worm 2 is connected to the parking motor 1, and the worm wheel 3 is meshed with the worm 2. The parking motor 1 drives the worm wheel to rotate through the worm 2.

[0050] A threaded hole is provided at the center of the worm wheel 3 along its axial direction for connection with the screw 4. The cooperation between the worm wheel 3 and the worm 2 realizes the conversion and transmission of power between the screw 4 assembly.

[0051] The screw rod 4 assembly includes a screw rod 4, a pawl 5, and a ratchet wheel 6 arranged in cooperation with the pawl 5. The screw rod 4 is threadedly connected to the threaded hole at the center of the worm wheel 3, and the pawl 5 is connected to the screw rod 4 and moves with the movement of the screw rod 4.

[0052] When the worm wheel 3 rotates, one end of the pawl 5 is restricted from circumferential rotation, and under the drive of the worm wheel, the screw 4 moves linearly along the axial direction of the threaded hole in the center of the worm wheel, thereby driving the pawl 5 to move linearly. Since the ratchet wheel 6 and the pawl 5 are arranged in coordination, the pawl 5 moves linearly, so that the pawl 5 abuts against or disengages from the ratchet wheel 6 to realize parking brake or release.

[0053] The brake device 7 is used to drive the brake mechanism to operate. The brake device 7 is connected to the ratchet 6. The parking brake is applied or released by the contact or separation between the pawl 5 and the ratchet 6.

[0054] like Figure 2 , Figure 3 As shown, in order to achieve direct engagement of the pawl 5 with the ratchet 6 in a linear motion state, one end of the pawl 5 is connected to the screw 4, and the other end is inserted into a limiting groove 10 provided inside the housing to limit the circumferential rotation of the screw 4.

[0055] When the parking motor 1 drives the worm 2 and the worm wheel 3 to rotate, the worm wheel drives the screw 4 to move linearly in the axial direction. The pawl 5 cooperates with the limiting groove 10, and the screw 4 maintains a linear motion state, thereby directly driving the pawl 5 to engage or disengage with the ratchet wheel 6.

[0056] During parking, since the pawl 5 limits the circumferential rotation of the screw 4, the cooperation between the pawl 5 and the ratchet 6 is more stable. Even if the vehicle is subjected to external vibration or impact, the cooperation between the pawl 5 and the ratchet 6 will not loosen or fail due to the rotation of the screw 4, thereby improving the stability of parking.

[0057] As an optimization, Figure 5 As shown, a mounting hole 41 is provided at one end where the screw rod 4 is connected to the pawl 5, and the pawl 5 is movably mounted on the mounting hole 41. The pawl 5 can move along the opening direction of the mounting hole 41, which makes the parking mechanism more flexible during parking or releasing, and can adapt to ratchets 6 of different sizes or shapes to a certain extent, thereby increasing the versatility and adaptability of the parking mechanism, so that the parking mechanism can be more widely used in different types of electronic mechanical brakes.

[0058] At the same time, the design of the pawl 5 moving along the mounting hole 41 reduces friction and wear during parking. Compared with the fixed pawl 5, the movable pawl 5 can cooperate with the ratchet wheel 6 more smoothly when parking or releasing, reducing the wear rate of the parking mechanism and extending the service life.

[0059] As a further optimization, Figure 4 , Figure 5 As shown, a through guide groove 42 is provided along the radial direction of the screw rod 4 near the opening of the mounting hole 41, and the guide groove 42 passes through the mounting hole 41. One end of the pawl 5 is movably mounted at the guide groove 42 of the screw rod 4 through a pin 8, and the pawl 5 can move forward and backward along the guide groove 42 under the cooperation of the pin 8 and the guide groove 42.

[0060] The guide groove 42 is designed to provide an accurate sliding path for the pin 8, ensuring that the pawl 5 can maintain a stable posture during the movement, which helps the pawl 5 to accurately match the ratchet wheel 6 and improves the reliability and stability of the parking mechanism.

[0061] The pin 8 can slide forward and backward along the guide groove 42, so that the pawl 5 has greater flexibility during parking or releasing. The pawl 5 can freely adjust the matching position with the ratchet wheel 6 according to the working state of the parking mechanism to ensure the smooth execution of the parking action.

[0062] Through the design of the above technical solution, the pawl 5 cooperates with the ratchet wheel 6 by sliding the pin 8 in the guide groove 42, thereby reducing friction and wear during parking. At the same time, the noise generated during parking is also reduced, and the comfort of operation is improved.

[0063] In order to further improve the parking effect of the pawl 5 and the ratchet wheel 6, as shown in FIG. Figure 4 As shown, an elastic member 9 adapted to the mounting hole 41 is provided inside the mounting hole 41, and the elastic member 9 is located between the screw rod 4 and the pawl 5, one end of the elastic member 9 abuts against the bottom of the mounting hole 41, and the other end abuts against one end of the pawl 5 inserted into the mounting hole 41.

[0064] During parking braking, during the parking process, the elastic member 9 (such as a spring) provides elastic force for the cooperation between the pawl 5 and the ratchet 6 to ensure a tight cooperation between the pawl 5 and the ratchet 6 .

[0065] The elastic force of the elastic member 9 ensures a tight fit between the pawl 5 and the ratchet 6. Even if the pawl 5 and the ratchet 6 are not completely aligned or matched at the initial stage of parking, effective parking braking can be achieved through the promotion of the elastic force, thereby enhancing the parking stability.

[0066] Due to the presence of the elastic member 9, the pawl 5 has the ability to automatically adjust during parking. When there is a slight gap or deviation between the pawl 5 and the ratchet 6, the elastic member 9 can push the pawl 5 to make a fine adjustment so that it and the ratchet 6 reach the best matching state.

[0067] The elastic member 9 can provide continuous elastic force for the pawl 5, ensuring that the pawl 5 and the ratchet wheel 6 always maintain a close fit. This design helps to prevent the pawl 5 from being separated from the ratchet wheel 6 due to vibration or impact, thereby improving the stability of the parking mechanism.

[0068] When the parking mechanism is released, the elastic member 9 can push the pawl 5 to automatically reset and return it to the initial position, which helps to prepare for the next parking action and improves the response speed and reliability of the parking mechanism.

[0069] At the same time, the presence of the elastic member 9 can reduce the direct friction between the pawl 5 and the mounting hole 41, thereby reducing wear and noise, which helps to extend the service life of the parking mechanism and improve the comfort of operation.

[0070] The elastic member 9 can provide a certain amount of deformation, which enables the parking mechanism to better adapt to ratchet wheels 6 of different sizes or shapes. Even if the ratchet wheel 6 has a certain size deviation or irregular shape, the elastic member 9 can ensure a tight fit between the pawl 5 and the ratchet wheel 6.

[0071] In summary, the specific working principle of the electronic parking mechanism is as follows:

[0072] During operation, the parking motor 1 drives the worm wheel 3 to rotate through the worm 2. The rotation of the worm wheel 3 drives the screw 4 to move linearly along the central axial direction of the worm wheel 3, thereby driving the pawl 5 to move toward the ratchet wheel 6 or in the opposite direction to perform parking braking or release parking.

[0073] The cooperation between the worm 2 and the worm wheel 3 realizes efficient transmission. The parking motor 1 transmits the rotational motion to the worm wheel 3 through the worm 2, and the worm wheel 3 converts the rotational motion into the linear motion of the screw 4. This transmission method has a compact structure and high transmission efficiency, which helps the parking mechanism to quickly respond to parking or release commands.

[0074] The linear motion of the screw 4 drives the pawl 5 to move toward the ratchet 6 to achieve parking brake. Due to the self-locking property of the worm gear 3 and the worm 2, when the parking motor 1 stops working, the worm gear 3 can maintain the current position, thereby ensuring that the pawl 5 and the ratchet 6 are closely matched to achieve stable parking brake.

[0075] When the parking is to be released, the parking motor 1 rotates in the reverse direction, and the worm 2 drives the worm wheel 3 to rotate in the reverse direction, thereby driving the screw 4 to move in the reverse direction, and driving the pawl 5 to move away from the ratchet wheel 6. This ensures that the parking mechanism can reliably release the parking and restore the normal driving state of the vehicle.

[0076] When parking, the pawl 5 contacts the ratchet wheel 6 , the parking motor 1 is powered off, and the pawl 5 maintains a continuous parking state under the elastic force of the elastic member 9 .

[0077] When the parking motor 1 is powered off, the pawl 5 can maintain close contact with the ratchet wheel 6 under the elastic force of the elastic member 9, thereby ensuring that the vehicle is parked stably. This design avoids parking failure caused by motor power failure or failure, and improves the reliability of the parking system.

[0078] Since the pawl 5 can automatically maintain the parking state under the action of the elastic member 9, there is no need for complex control logic to continuously monitor and maintain the parking state. This simplifies the control logic of the parking system and reduces the complexity and failure rate of the system.

[0079] In the parking state, the parking motor 1 does not need to be continuously powered to maintain the contact between the pawl 5 and the ratchet wheel 6, thereby reducing energy consumption.

[0080] When releasing the parking, the parking motor 1 reverses, driving the worm 2, the worm wheel 3 and the screw 4 to move in the opposite direction, and the pawl 5 moves away from the ratchet 6, and the pawl 5 is disengaged from the ratchet 6, thereby realizing parking release.

[0081] When the parking motor 1 is reversed, it can quickly drive the worm 2, the worm wheel 3 and the screw 4 to move in the opposite direction, so that the pawl 5 quickly moves away from the ratchet wheel 6. This ensures that the parking system can quickly respond to the command to release the parking, thereby improving the driving efficiency of the vehicle.

[0082] Another object of the present application is to provide an electronic mechanical brake, which is equipped with the above-mentioned electronic parking mechanism. The mechanism realizes parking by driving the transmission mechanism with a motor, has a stable and reliable structure and is not affected by vibration, effectively solves the problems existing in the existing electromagnet parking mechanism, and improves the safety and efficiency of the EMB parking system.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0084] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

Claims

1. An electronic parking mechanism, installed in a housing, characterized in that: include: Parking motor (1); A worm (2) connected to the parking motor (1) and driven by the parking motor (1); A worm wheel (3) meshes with the worm (2) and is driven by the worm (2), wherein a threaded hole is arranged at the center of the worm wheel (3) along its axial direction; A screw (4) assembly comprises a screw (4), a pawl (5), and a ratchet (6) arranged in cooperation with the pawl (5); the screw (4) is threadedly connected to a threaded hole at the center of a worm wheel (3); the worm (2) can move along the axial direction of the center of the worm wheel (3), so that the pawl (5) and the ratchet (6) abut or disengage; The brake device (7) is connected to the ratchet (6) and performs parking brake or release through the contact or separation of the ratchet pawl (5) and the ratchet (6).

2. The electronic parking mechanism according to claim 1, characterized in that: One end of the ratchet (5) is connected to the screw rod (4), and the other end is inserted into a limiting groove (10) arranged inside the housing, so as to limit the circumferential rotation of the screw rod (4).

3. The electronic parking mechanism according to claim 2, characterized in that: One end of the screw rod (4) connected to the pawl (5) is provided with a mounting hole (41); the pawl (5) is movably mounted on the mounting hole (41), and the pawl (5) can move along the opening direction of the mounting hole (41).

4. The electronic parking mechanism according to claim 3, characterized in that: A through guide groove (42) is provided near the opening of the mounting hole (41) of the screw rod (4) along the radial direction of the screw rod (4), and the guide groove (42) passes through the mounting hole (41); One end of the pawl (5) is movably mounted on the guide groove (42) of the screw rod (4) through a column pin (8), and the column pin (8) can slide forward and backward along the guide groove (42).

5. The electronic parking mechanism according to claim 3 or 4, characterized in that: An elastic member (9) adapted to the mounting hole (41) is arranged inside the mounting hole (41); one end of the elastic member (9) extends into the mounting hole (41) and abuts against the inner wall of the mounting hole, and the other end abuts against one end of the ratchet (5) inserted into the mounting hole (41).

6. The electronic parking mechanism according to claim 1, characterized in that: The parking motor (1) drives the worm wheel (3) to rotate via the worm (2), and the rotation of the worm wheel (3) drives the screw (4) to move linearly along the central axial direction of the worm wheel (3), thereby driving the ratchet (5) to move in the direction of the ratchet wheel (6) or in the opposite direction, thereby performing parking braking or releasing parking.

7. The electronic parking mechanism according to claim 5, characterized in that: When parking, the pawl (5) contacts the ratchet wheel (6), the parking motor (1) is powered off, and the pawl (5) maintains a continuous parking state under the elastic force of the elastic member (9).

8. The electronic parking mechanism according to claim 1, characterized in that: When releasing the parking state, the parking motor (1) rotates in reverse, driving the worm (2), the worm wheel (3) and the screw (4) to move in the opposite direction, and the ratchet (5) moves in a direction away from the ratchet (6), and the ratchet (5) is disengaged from the ratchet (6), thereby realizing parking release.

9. The electronic parking mechanism according to claim 5, characterized in that: The elastic member (9) is located between the screw rod (4) and the pawl (5). When the parking brake is applied, when the pawl (5) and the ratchet wheel (6) are not fully matched, the pawl (5) continues to move toward the ratchet wheel (6) under the elastic force of the elastic member (9), thereby applying the parking brake.

10. An electromechanical brake, characterized in that: It comprises the electronic parking mechanism as described in any one of claims 1-9.

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