Parking locking mechanism of electronic mechanical brake

Abstract

The utility model discloses a parking locking mechanism of an electronic mechanical brake, which structurally comprises a brake driving motor installed on one side of a shell of the electronic mechanical brake, an execution gear is installed on a driving main shaft of the brake driving motor, a ratchet wheel is installed on one axial side of the execution gear, and a ratchet wheel is installed on the other axial side of the execution gear. A ratchet wheel is arranged in the shell, a pawl matched with the ratchet wheel is arranged on one side of the ratchet wheel, the pawl is driven by a locking motor on the shell to rotate, the end of the pawl is clamped with or separated from ratchets on the ratchet wheel, a PCBA board is installed in the shell, an angle sensor device matched with the PCBA board is installed at the end of the main shaft, and the angle sensor device is connected with the ratchet wheel. The locking structure of the ratchet wheel and the pawl is arranged, the pawl is driven by the locking motor to rotate, the locking structure can be accurately controlled through cooperation with the angle sensor device, and stability and reliability are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile brake, specifically a parking locking mechanism of electronic mechanical brake. BACKGROUND

[0002] With the development of intelligentization of the automobile industry, people's functional demand for intelligent driving application technology is also increasingly strong. As one of the core technologies of automatic driving, the drive-by-wire technology has also begun to enter a rapid development stage. And the drive-by-wire braking, as an important part of the drive-by-wire technology, has also ushered in the opportunity and challenge of rapid development. At present, most of the brake products on the market are electro-hydraulic brake products, not pure drive-by-wire technology products. The electro-hydraulic brake product has its own defects, such as heavy weight, complex structure, reliance on brake pipeline, and the need for regular replacement of brake fluid; and the four wheels of the automobile cannot be independently controlled, and the brake force cannot be distributed as needed; at the same time, there is also a problem of response speed, the driver needs to step on the pedal to push the brake fluid, and only after the brake fluid flows through the brake pipeline can the brake be applied, so the corresponding response speed is slow and the brake time is long.

[0003] The electronic mechanical brake system mainly realizes braking under pure mechanical conditions. For the current hot development of new energy vehicles, there is no brake fluid, which is pollution-free at the same time, reduces the weight of the vehicle, and can better recover energy. The mechanical structure required in the mechanical brake system technology is simple, the cost is lower, the software control is more convenient, the response speed is faster, and four-wheel independent control can be realized to cope with various complex road conditions, and can meet various stringent standard requirements and market evaluation system requirements of the automobile, and promote the rapid development of automobile active safety technology.

[0004] The electronic mechanical brake system needs to realize the functions of conventional braking and parking, and in the mechanical structure, the motor drives the gear and other speed reduction and torque increasing mechanisms, and then applies a conversion mechanism to convert the rotary motion into linear motion structure, and requires that the conversion mechanism can cope with high durability of parking, but because the ball screw, planetary roller screw and other conversion mechanisms on the market do not have self-locking performance, an additional parking locking mechanism is required. Because the self-locking scheme applied in the market mostly uses a spring locking and returning mechanism, the durability and reliability cannot be guaranteed, so a parking locking mechanism for an electronic mechanical brake is needed to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model provides a parking locking mechanism of electronic mechanical brake, which can solve the problem of poor durability and reliability of the locking and returning mechanism of the existing electronic mechanical brake.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: A parking locking mechanism of electronic mechanical brake, its structure includes brake drive motor, installs one side of the casing of electronic mechanical brake, the driving main shaft of brake drive motor is equipped with the execution gear, the axial one side of execution gear is equipped with the ratchet wheel, the side of ratchet wheel is provided with the pawl matched with ratchet wheel, the pawl is rotated by locking motor drive of casing and makes the end of pawl and the ratchet tooth on ratchet wheel and disengages, the inside of casing is equipped with PCBA board, the end of main shaft is equipped with angle sensor device matched with PCBA board, through setting locking structure of ratchet wheel and pawl, the pawl is rotated by locking motor drive, and the accurate control of locking structure can be realized with angle sensor device cooperation, and stable and reliable.

[0007] As preferred, the main shaft of the locking motor is provided with a driving gear, the driving gear is engaged with the transmission teeth on the edge of the pawl, and the driving gear and the pawl are connected through gear transmission, so that the pawl can be kept in the locked position and cannot move, and the control is accurate.

[0008] As preferred, the main shaft of the locking motor is provided with a driving gear, the driving gear is engaged with the transmission teeth on the edge of the pawl through a transmission gear set, and the transmission gear set can increase the torque applied by the locking motor to the pawl.

[0009] As preferred, a locking fixing frame is installed on one side of the execution gear inside the casing, the locking motor is installed on the locking fixing frame, the locking fixing frame can install and fix the locking motor, and meanwhile, the locking fixing frame can leave enough space for the pawl and the driving gear.

[0010] As preferred, the angle sensor device comprises a mounting block installed on the end of the main shaft, a magnetic pole is installed on the end of the mounting block, a magnetic induction chip is installed on the PCBA board at a position corresponding to the magnetic pole, and the distance between the magnetic pole and the magnetic induction chip is obtained through simulation, so that the rotation of the main shaft can be controlled in real time.

[0011] As preferred, the casing comprises a lower casing, an upper casing and an upper cover installed on the side of the upper casing, the upper casing and the lower casing are spliced up and down, the PCBA board is installed in the space between the upper cover and the upper casing, the PCBA board can be separately installed and fixed, and the structure is reasonable.

[0012] As preferred, the brake drive motor is installed on the lower casing, and the locking motor is arranged through the upper casing, so that the space of the casing can be reasonably utilized to install the locking motor and the brake drive motor, and the structure is compact.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] The structure is simple, the locking structure of the ratchet wheel and the pawl is arranged, the pawl is driven to rotate by the locking motor, cooperation with the angle sensor device can realize accurate control of the locking structure, when the pawl is stuck to the ratchet wheel, the parking locking action is completed, the locking motor is powered off, and the current parking state can be maintained, which is stable and reliable; when the parking is released, the locking motor drives the pawl to move away from the ratchet wheel, and the pawl cannot be vibrated from the release state to the locking state due to vibration and the like. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a main view of the sectional structure of the utility model;

[0016] Figure 2 It is a three-dimensional explosion decomposition state diagram of the utility model;

[0017] Figure 3 It is an enlarged structure diagram of A of the utility model; Figure 1

[0018] Figure 4 It is a partial three-dimensional structure diagram of the utility model;

[0019] Figure 5 It is a ratchet wheel and pawl locking state schematic diagram of the utility model;

[0020] Figure 6 It is a ratchet wheel and pawl unlocking state schematic diagram of the utility model;

[0021] Figure 7 It is a partial three-dimensional structure diagram of the utility model.

[0022] Reference signs:

[0023] 1, brake actuator motor, 11, drive spindle, 2, housing, 21, lower housing, 22, upper housing, 23, upper cover, 3, PCBA board, 4, angle sensor device, 41, magnetic pole, 42, magnetic induction chip, 43, mounting block, 5, locking motor, 6, execution gear, 7, ratchet wheel, 8, drive gear, 9, locking fixed frame, 10, pawl, 101, pawl jaw end, 102, pawl gear end. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model.

[0025] As Figures 1-7 ​The utility model discloses a parking locking mechanism of electronic mechanical brake, which is used to solve the problems of poor durability and reliability of the locking and returning mechanism of the existing electronic mechanical brake, and provides the following technical scheme: a parking locking mechanism of electronic mechanical brake, which comprises a brake driving motor 1 installed on one side of a shell 2 of the electronic mechanical brake, an execution gear 6 installed on a driving main shaft 11 of the brake driving motor 1, a ratchet wheel 7 installed on one side of the execution gear 6, a pawl 10 provided on one side of the ratchet wheel 7 and matched with the ratchet wheel 7, the pawl 10 being driven to rotate by a locking motor 5 on the shell 2, so that the end of the pawl 10 is engaged with or separated from the ratchet teeth on the ratchet wheel 7, a PCBA board 3 installed in the shell 2, and an angle sensor device 4 matched with the PCBA board 3 and installed on the end of the main shaft 11. The locking structure of the ratchet wheel 7 and the pawl 10 is provided, the pawl 10 is driven to rotate by the locking motor 5, and the angle sensor device 4 is matched to realize accurate control of the locking structure, so that the parking locking mechanism is stable and reliable.

[0026] Specifically, the parking locking mechanism is part of the structure of the electronic mechanical brake, the execution gear 6 is the initial end of the speed reduction mechanism and is connected with the gear transmission mechanism, the common action of the gear assembly can realize the function of speed reduction and torque increase, and finally realizes the brake function.

[0027] When the pawl 10 acts on the ratchet wheel 7, the ratchet wheel 7 stops moving and keeps in the locking state, the execution gear 6 on the driving main shaft 11 also stops moving, and the meshed gear transmission mechanism also stops moving. In theory, all the parts of the gear transmission mechanism can be locked, but because only the initial gear, the torque of the execution gear 6 is the smallest and is most easily controlled, and the required braking force is the smallest when locking, therefore, the optimal scheme is to lock the execution gear 6.

[0028] The number of the ratchet teeth of the ratchet wheel 7 is as large as possible in the technical field of mechanical strength, so as to control the parking stroke and improve the control accuracy of the parking force. The pawl 10 has two working states: the ratchet wheel and pawl parking locking state and the ratchet wheel and pawl release locking state. Correspondingly, the pawl 10 is positioned at two points: one is the locking state of the pawl 10 and the ratchet wheel 7, and the other is that the pawl 10 is away from the ratchet wheel 7, and the pawl limiting end on the shell 2 serves as a limiting function; the angle of the two states of the pawl 10 is 30°, and the angle is set according to two aspects: one is to ensure complete separation, for example, the pawl 10 will not be returned to the locking state and be stuck when vibrating, and the other is that the distance between the pawl 10 and the ratchet wheel 7 is moderate, the action time is moderate, and the distance between the two positioning points of the pawl 10 from the locking port to the release port is too far, which will cause the parking action time to be too long. The number of the pawl gear teeth on the pawl 10 can be designed according to the effective gear number of the beginning and end states of the two positioning points of the pawl, and the invalid gear features of the travel outside the meshing requirement can be removed, so as to reduce the material consumption and the processing cost.

[0029] The pawl catch end 101 of the pawl 10 acts on the ratchet teeth of the ratchet wheel 7 to achieve the locking and release of the parking. Due to the requirement of the number of parking endurance, there is a problem of wear and tear of the ratchet wheel 7 and the pawl 10, so a hard layer can be plated on the contact surface of the pawl 10 with the ratchet wheel 7 to increase the wear resistance.

[0030] In the present embodiment, the main shaft of the locking motor 5 is provided with a driving gear 8, the driving gear 8 is engaged with the transmission teeth on the edge of the pawl 10, and the driving gear 8 and the pawl 10 are connected through gear transmission, so that the pawl 10 can be kept in the locked position and cannot move, and the control is accurate.

[0031] As another embodiment, the main shaft of the locking motor 5 is provided with a driving gear 8, the driving gear 8 is connected with the transmission teeth on the edge of the pawl 10 through a transmission gear set, and the transmission gear set can increase the torque applied by the locking motor 5 to the pawl 10.

[0032] As an installation scheme of the locking motor 5, a locking fixing frame 9 is installed on one side of the inside of the housing 2 where the gear 6 is located, the locking motor 5 is installed on the locking fixing frame 9, the locking fixing frame 9 can fix the locking motor 5, at the same time, the locking fixing frame 9 can leave enough space for the pawl 10 and the driving gear 8, and the locking fixing frame 9 is fixed on the housing 2 through screws.

[0033] When the vehicle is running, the parking locking mechanism is in the parking release state, that is, the pawl 10 is away from the ratchet wheel 7, but there may be a situation that the pawl 10 vibrates from the release state to the locking state due to vibration and other conditions, causing dangerous situations to occur. Therefore, the locking motor 5 adopts H-bridge direct motor circuit control to maintain the main shaft of the locking motor 5 from shaking.

[0034] In addition, in the present embodiment, the mechanical parts are protected through software logic control. When the pawl 10 is continuously away, the contact area between the pawl 10 and the ratchet wheel 7 becomes smaller and smaller, the stress becomes more and more concentrated, and the pawl 10 and the ratchet wheel 7 are more and more easily damaged, especially in the case of more number of parking endurance, the damage is greater. Therefore, on the basis of trying to select high-strength mechanical performance materials, the pawl 10 and the ratchet wheel 7 are protected from damage through software control logic. After receiving the parking brake release signal, the brake driving motor 1 is first reversed, there is no torque between the pawl 10 and the ratchet wheel 7 after reversing, at this time the locking motor 5 rotates, drives the driving gear 8 to engage with the gear on the pawl gear end 102, drives the pawl catch end 101 to rotate away from the ratchet wheel 7 from the locking state to the release state of the pawl limit end, the pawl 10 can easily release the parking, and the pawl 10 and the ratchet wheel 7 do not produce mechanical damage, which guarantees the safety performance.

[0035] As a specific embodiment of the angle sensor device 4, as shown in Figures 1-3 the angle sensor device 4 comprises a mounting block 43 mounted at the end of the main shaft 11, a magnetic pole 41 is mounted at the end of the mounting block 43, a magnetic induction chip 42 is mounted at the position corresponding to the magnetic pole 41 on the PCBA board 3, the distance between the magnetic pole 41 and the magnetic induction chip 42 is obtained by simulation, and the rotation of the main shaft 11 can be controlled in real time.

[0036] In the embodiment, as shown in Figure 2 the housing 2 comprises a lower housing 21, an upper housing 22 and an upper cover 23 mounted on the side of the upper housing 22, the upper housing 22 and the lower housing 21 are spliced up and down, the PCBA board 3 is mounted in the space between the upper cover 23 and the upper housing 22, the PCBA board 3 can be separately mounted and fixed, and the structure is reasonable. The brake driving motor 1 is mounted on the lower housing 21, and the locking motor 5 is arranged through the upper housing 22, so that the space of the housing 2 can be reasonably utilized to mount the locking motor 5 and the brake driving motor 1, and the structure is compact.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0038] In addition, in the present application, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0039] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In addition, the technical solutions of various embodiments of the utility model can be combined with each other, but must be based on that a person having ordinary skill in the art can realize, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of such technical solutions does not exist, also not within the protection scope required by the utility model.

Claims

1. A parking lock mechanism of an electromechanical brake, characterized by, The structure comprises: The brake driving motor (1) is installed on one side of the shell (2) of the electromechanical brake, a driving main shaft (11) of the brake driving motor (1) is provided with an execution gear (6), an axial side of the execution gear (6) is provided with a ratchet wheel (7), one side of the ratchet wheel (7) is provided with a pawl (10) matched with the ratchet wheel (7), the pawl (10) is driven to rotate by a locking motor (5) on the shell (2), so that the end of the pawl (10) is engaged with or separated from the ratchet teeth on the ratchet wheel (7), a PCBA board (3) is installed in the shell (2), and an angle sensor device (4) matched with the PCBA board (3) is installed at the end of the main shaft (11).

2. The parking lock mechanism of an electromechanical brake according to claim 1, characterized by: The main shaft of the locking motor (5) is provided with a driving gear (8), and the driving gear (8) is engaged with the transmission teeth on the edge of the pawl (10).

3. The parking lock mechanism of an electromechanical brake according to claim 1, characterized by: The main shaft of the locking motor (5) is provided with a driving gear (8), and the driving gear (8) is connected with the transmission teeth on the edge of the pawl (10) through a transmission gear set.

4. The parking lock mechanism of an electromechanical brake according to claim 1, characterized by: The locking motor (5) is installed on the locking fixing frame (9) on one side of the execution gear (6) in the shell (2).

5. The parking lock mechanism of an electromechanical brake according to claim 1, characterized by: The angle sensor device (4) comprises a mounting block (43) installed at the end of the main shaft (11), a magnetic pole (41) is installed at the end of the mounting block (43), and a magnetic induction chip (42) is installed on the PCBA board (3) at a position corresponding to the magnetic pole (41).

6. The parking lock mechanism of an electromechanical brake according to claim 1, characterized by: The shell (2) comprises a lower shell (21), an upper shell (22) and an upper cover (23) installed on one side of the upper shell (22), the upper shell (22) and the lower shell (21) are spliced up and down, and the PCBA board (3) is installed in the space between the upper cover (23) and the upper shell (22).

7. The parking lock mechanism of an electromechanical brake according to claim 6, wherein: The brake driving motor (1) is installed on the lower shell (21), and the locking motor (5) is arranged through the upper shell (22).

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