Modularized electromechanical brake based on reverse planetary roller screw

Abstract

The utility model relates to the technical field of automobile braking, in particular to a modular electromechanical brake based on a reverse planetary roller screw, which mainly comprises a reverse planetary roller screw pair and a gear compound transmission system consisting of a main rack, a first gear, a second gear, a reversing gear, a first auxiliary rack and a second auxiliary rack. The technical scheme has the advantages that compared with a standard planetary roller lead screw, the reverse planetary roller lead screw pair has a smaller return clearance, so that mechanical lag is reduced; the reverse planetary roller lead screw pair can more effectively control and distribute friction force, so that the friction force between rollers is minimized, and the energy loss is reduced; and moreover, the reverse planetary roller screw pair has higher transmission rigidity, which means that the deformation of the screw system is small under the same load. In conclusion, the brake can respond to the operation of a driver more quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive braking, and particularly relates to a modular electro-mechanical brake based on a reverse planetary roller screw. Background Technique

[0002] With the rapid development of the new energy vehicle industry, the safety performance and driving comfort of new energy vehicles have become the focus of consumers' attention. As an important part of the vehicle safety performance, the technological development and innovation of the braking system are particularly important. Although traditional electro-hydraulic brakes have been developed and optimized for many years, there are still problems such as slow response speed, complex maintenance, and sensitivity to environmental temperature. In order to overcome the disadvantages of electro-hydraulic brakes, electro-mechanical brakes have been invented.

[0003] In ordinary electro-mechanical brakes, the motion conversion and power transmission mainly pass through a standard planetary roller screw pair. During braking, the mechanical transmission device directly converts the torque of the motor into braking force. The standard planetary roller screw pair usually has a complex structure, a large weight, and more sliding friction, resulting in increased wear and lower transmission efficiency. Content of the Utility Model

[0004] Aiming at the technical problems of the existing defects in electro-mechanical brakes, the utility model provides a modular electro-mechanical brake based on a reverse planetary roller screw. It adopts a reverse planetary roller screw pair. Compared with the standard planetary roller screw, it has a smaller backlash, thereby reducing mechanical hysteresis; and can more effectively control and distribute the friction force, minimizing the friction force between the rollers, thereby reducing energy loss; and, the reverse planetary roller screw pair has higher transmission rigidity, which means that under the same load, the deformation of the screw system is smaller. In short, the brake of the utility model can respond faster to the driver's operation.

[0005] The technical solution provided by the present utility model is as follows: A modular electro-mechanical brake based on a reverse planetary roller screw, comprising a first housing, wherein a motor and a reverse planetary roller screw pair are arranged inside the first housing. The reverse planetary roller screw pair includes a nut, rollers, and a screw. The nut is fixed inside the first housing. The rollers are located between the nut and the screw. The nut meshes with the rollers, and the rollers mesh with the screw. The output end of the motor is fixedly connected to the rollers. A second housing is arranged on one side of the first housing, and a notch is provided on the second housing. A main rack, a first gear, a second gear, a reversing gear, a first sub-rack, and a second sub-rack are arranged inside the second housing. The main rack is connected to the screw through a universal joint. The main rack meshes with the first gear and the reversing gear. The first gear meshes with the first sub-rack. The reversing gear meshes with the second gear, and the second gear meshes with the second sub-rack. The first sub-rack and the second sub-rack are arranged oppositely, and brake pads are fixedly arranged at one end of the first sub-rack facing the second sub-rack and at one end of the second sub-rack facing the first sub-rack. A brake disc is arranged between the brake pads, and both the brake pads and the brake disc are located at the notch.

[0006] Optionally, the motor is connected to the nut through a planetary reducer, and the planetary reducer is arranged inside the first housing.

[0007] Optionally, a coupling is arranged between the motor and the planetary reducer, and the coupling is arranged inside the first housing.

[0008] Optionally, a first slide rail is fixedly arranged inside the second housing, and a first slider is movably arranged on the first slide rail. The main rack is fixedly connected to the first slider.

[0009] Optionally, a second slide rail and a third slide rail are arranged inside the second housing. A second slider is movably arranged on the second slide rail, and the second slider is fixedly connected to the first sub-rack. A third slider is movably arranged on the third slide rail, and the third slider is fixedly connected to the second sub-rack.

[0010] Optionally, both ends of the nut communicate with the outside, and the screw extends outward from one end of the nut.

[0011] Optionally, bearings are arranged between the first gear and the second housing, between the second gear and the second housing, and between the reversing gear and the second housing.

[0012] Optionally, the motor adopts a DC brushless motor.

[0013] Beneficial effects

[0014] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects: Aiming at the technical problem of defects existing in the existing electromechanical brake, the present utility model mainly adopts a reverse planetary roller screw pair. Compared with the standard planetary roller screw, it has a smaller backlash, thereby reducing mechanical hysteresis; and it can more effectively control and distribute friction force, minimizing the friction force between the rollers, thus reducing energy loss; moreover, the reverse planetary roller screw pair has higher transmission rigidity, which means that under the same load, the deformation of the screw system is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a schematic structural diagram of a modular electromechanical brake based on a reverse planetary roller screw proposed by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To further understand the content of the present utility model, the present utility model will be described in detail in combination with the drawings and embodiments.

[0017] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. In addition, it should be noted that for the sake of description, only the parts related to the utility model are shown in the drawings. The terms "first", "second", etc. used in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect, and are all general references, and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions without contradiction or conflict, and all are within the scope of protection required by the present utility model.

[0018] In combination with the attached Figure 1 , this embodiment proposes a modular electro-mechanical brake based on a reverse planetary roller screw, including a first housing 10. A motor 11 and a reverse planetary roller screw pair are arranged in the first housing 10. The reverse planetary roller screw pair includes a nut 12, rollers 13, and a screw 14. The nut 12 is fixed in the first housing 10. The rollers 13 are located between the nut 12 and the screw 14. The nut 12 meshes with the rollers 13, and the rollers 13 mesh with the screw 14. The output end of the motor 11 is fixedly connected to the rollers 13.

[0019] On one side of the first housing 10, a second housing 15 is provided, and a notch 16 is provided on the second housing 15; a main rack 17, a first gear 18, a second gear 19, a reversing gear 20, a first sub-rack 21 and a second sub-rack 22 are arranged inside the second housing 15; the main rack 17 is connected to the lead screw 14 through a universal joint 23. The main rack 17 meshes with the first gear 18 and the reversing gear 20, the first gear 18 meshes with the first sub-rack 21; the reversing gear 20 meshes with the second gear 19, and the second gear 19 meshes with the second sub-rack 22; the first sub-rack 21 and the second sub-rack 22 are arranged oppositely, and brake pads 24 are fixedly arranged at one end of the first sub-rack 21 facing the second sub-rack 22 and at one end of the second sub-rack 22 facing the first sub-rack 21. A brake disc is arranged between the brake pads 24, and both the brake pads 24 and the brake disc are located at the notch 16.

[0020] Based on the above structure, for the modular electro-mechanical brake based on the reverse planetary roller screw of this embodiment, its working principle is as follows: When the motor 11 is started, the rotational motion at the output end of the motor 11 is transmitted to the reverse planetary roller screw pair. The reverse planetary roller screw pair receives the rotational motion at the output end of the motor 11 and converts it into the linear motion of the lead screw 14. For the reverse planetary roller screw pair, its rollers 13 are evenly distributed between the nut 12 and the lead screw 14, and the force is transmitted in a rolling manner. Based on its own planetary structure, it ensures smooth and efficient transmission and forms an efficient and low-friction linear thrust.

[0021] The universal joint 23 connects the reverse planetary roller screw pair and the main rack 17. The setting of the universal joint 23 allows the electro-mechanical brake to be flexibly transmitted at different installation angles and positions. It can compensate for the deviation caused by vehicle movement or installation error, ensuring smooth and efficient transmission during the transmission process. The linear thrust generated by the reverse planetary roller screw is transmitted to the main rack 17 through the universal joint 23. The linear motion of the main rack 17 will be converted into the linear motion of the first sub-rack 21 and the second sub-rack 22 through the first gear 18, the reversing gear 20 and the second gear 19, so that the brake pads 24 clamp the brake disc on the wheel (the brake disc is not shown in the attached drawing), generating frictional force, and then decelerating or stopping the vehicle. It can be imagined that when it is necessary to release the brake, the motor 11 can be reversed to make the aforementioned transmission chain work in reverse to achieve the release of the braking effect.

[0022] In this embodiment, the main rack 17, the first gear 18, the second gear 19, the reversing gear 20, the first sub-rack 21 and the second sub-rack 22 constitute a gear compound transmission system, ensuring the stability and consistency of the braking force during the transmission process and avoiding the torque fluctuation problem in the traditional mechanical braking system.

[0023] Among them, the motor 11 preferably adopts a brushless DC motor, so that the modular electro-mechanical brake based on the reverse planetary roller screw has greater braking force and faster response speed.

[0024] In a preferred embodiment, the motor 11 is connected to the nut 12 through a planetary reducer 25. By selecting the planetary reducer 25, the high speed and low torque of the motor can be converted into the output of low speed and high torque. The planetary reducer 25 ensures smooth and efficient transmission through its planetary gear system. In addition, the planetary reducer 25 can be further connected to the motor 11 through a coupling 26 to ensure the stability of the transmission chain. It can be understood that the rapid response ability of the motor 11 in this embodiment, combined with the efficient transmission of the planetary reducer 25, can ensure that the braking command of the driver or the autonomous driving system is responded to in a very short time, thus ensuring the braking performance.

[0025] In other preferred embodiments, a first slide rail 27 is fixedly arranged in the second housing 15, a first slider 28 is movably arranged on the first slide rail 27, and the main rack 17 is fixedly connected to the first slider 28. Thus, the linear motion of the main rack 17 can have better smoothness and stability.

[0026] Similarly to the above embodiment, a second slide rail 29 and a third slide rail 31 can also be arranged in the second housing 15; a second slider 30 is movably arranged on the second slide rail 29, and the second slider 30 is fixedly connected to the first auxiliary rack 21; a third slider 32 is movably arranged on the third slide rail 31, and the third slider 32 is fixedly connected to the second auxiliary rack 22. Thus, the linear motions of the first auxiliary rack 21 and the second auxiliary rack 22 can have better smoothness and stability.

[0027] In addition, bearings 33 can also be arranged between the first gear 18 and the second housing 15, between the second gear 19 and the second housing 15, and between the reversing gear 20 and the second housing 15. This embodiment can also further improve the smoothness and stability of the transmission.

[0028] In addition, in a preferred embodiment, both ends of the nut 12 of the reverse planetary roller screw pair are arranged to communicate with the outside, and the screw 14 extends outward from one end of the nut 12. The reason for this design is that if one end of the nut 12 is closed, during the normal telescopic movement of the screw 14, such as when the screw 14 extends outward, the screw 14 together with the roller 13 part will form a structure similar to a piston, resulting in a negative pressure at the rear end of the screw 14; and when the screw 14 retracts, a high pressure will be generated at the rear end of the screw 14. This air pressure change formed with the linear movement of the screw 14 will have a certain blocking effect on the movement of the screw 14 and will also affect the actual load of the screw 14, and the influence on the screw 14 will ultimately lead to the response speed and braking force of the brake. To solve the above defects, in this embodiment, both ends of the nut 12 are arranged to communicate with the outside, which can eliminate the airtightness inside the reverse planetary roller screw pair and prevent the airtightness from affecting the response speed of the reverse planetary roller screw pair.

[0029] The modular electro-mechanical brake based on the reverse planetary roller screw in this embodiment, by using the reverse planetary roller screw pair as the core transmission mechanism, has the following advantages: (1) The reverse planetary roller screw pair is designed with a smaller backlash. When the brake is started, the pre-tightening force in the system can be transmitted to the screw 14 more quickly, thereby reducing mechanical hysteresis and enabling the brake to respond to the driver's operation more quickly. (2) The reverse design can more effectively control and distribute the friction force, minimizing the friction force between the rollers 13, thereby reducing energy loss and enabling the brake to react more quickly when starting. (3) The reverse planetary roller screw pair usually has higher transmission rigidity, which means that under the same load, the deformation of the screw 14 system is smaller, thus improving the response speed.

[0030] The modular electro-mechanical brake based on the reverse planetary roller screw of this embodiment also has the following advantages: (1) The main rack 17, the first gear 18, the second gear 19, the reversing gear 20, the first sub-rack 21 and the second sub-rack 22 are combined into a modular gear compound transmission system through the second housing 15, and the motor 11, the planetary reducer 25, the reverse planetary roller screw pair, etc. in the first housing 10 can all be regarded as independent modules. Each module can form a standardized design and can be independently produced and assembled. This modular design avoids complex customization requirements and reduces development and manufacturing costs. The standardization and interchangeability of the modular components enable the brake to quickly locate and replace damaged components when a failure occurs, improving the maintenance convenience and operation reliability of the brake. (2) The modular design further achieves an integration effect, that is, for the modules included in the first housing 10 and the second housing 15, in fact, multiple functions are integrated into a single module, such as the integration of the planetary reducer 25 and the reverse planetary roller screw pair, reducing the number of components and complex connection devices, thereby reducing the complexity of production and assembly. And by integrating multiple functions, the dependence on external auxiliary components (such as additional connectors, brackets, fasteners, etc.) is reduced, further reducing material and manufacturing costs. (3) The precise matching design of the reverse planetary roller screw pair and the gear compound transmission system simplifies the complexity of the entire transmission chain, reduces energy loss during transmission and wear of the system. Also, the transmission design of the universal joint 23 simplifies the power transmission problem at different installation angles and reduces the complexity of the design.

[0031] In summary, the brake of this embodiment not only has good braking performance and faster response speed, but also has multiple advantages such as efficient transmission, stable output, modular design, and flexible adaptability, and is particularly suitable for new energy vehicles and autonomous driving vehicles.

[0032] The above has schematically described the present invention and its implementation manners. This description is not restrictive, and what is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the spirit of the present invention, creatively design structural manners and embodiments similar to this technical solution, they shall all fall within the protection scope of the present invention.

Claims

1. A modular electromechanical brake based on a reverse planetary roller screw, characterized in that: The invention comprises a first housing (10), wherein a motor (11) and a reverse planetary roller screw pair are arranged in the first housing (10), wherein the reverse planetary roller screw pair comprises a nut (12), a roller (13) and a screw (14), wherein the nut (12) is fixed in the first housing (10), the roller (13) is located between the nut (12) and the screw (14), the nut (12) is meshed with the roller (13), the roller (13) is meshed with the screw (14), and the output end of the motor (11) is fixedly connected to the roller (13); A second housing (15) is provided on one side of the first housing (10), and a notch (16) is provided on the second housing (15); a main rack (17), a first gear (18), a second gear (19), a reversing gear (20), a first auxiliary rack (21) and a second auxiliary rack (22) are provided in the second housing (15); the main rack (17) and the lead screw (14) are connected via a universal joint (23); The main rack (17) is meshed with the first gear (18) and the reversing gear (20), and the first gear (18) is meshed with the first auxiliary rack (21); the reversing gear (20) is meshed with the second gear (19), and the second gear (19) is meshed with the second auxiliary rack (22); the first auxiliary rack (21) and the second auxiliary rack (22) are arranged opposite to each other, and a brake pad (24) is fixedly arranged at one end of the first auxiliary rack (21) facing the second auxiliary rack (22) and one end of the second auxiliary rack (22) facing the first auxiliary rack (21), and a brake disc is arranged between the brake pads (24), and the brake pad (24) and the brake disc are both located at the notch (16).

2. A modular electromechanical brake based on an inverted planetary roller screw according to claim 1, characterized in that: The motor (11) and the nut (12) are connected via a planetary reducer (25), and the planetary reducer (25) is connected and arranged in the first housing (10).

3. A modular electromechanical brake based on an inverted planetary roller screw according to claim 2, characterized in that: A coupling (26) is provided between the motor (11) and the planetary reducer (25), and the coupling (26) is arranged in the first housing (10).

4. A modular electromechanical brake based on an inverted planetary roller screw according to claim 1, characterized in that: A first slide rail (27) is fixedly arranged in the second housing (15), a first slider (28) is movably arranged on the first slide rail (27), and the main rack (17) is fixedly connected to the first slider (28).

5. A modular electromechanical brake based on an inverted planetary roller screw according to claim 1 or 4, characterized in that: A second slide rail (29) and a third slide rail (31) are arranged in the second housing (15); a second slider (30) is movably arranged on the second slide rail (29), and the second slider (30) is fixedly connected to the first auxiliary rack (21); a third slider (32) is movably arranged on the third slide rail (31), and the third slider (32) is fixedly connected to the second auxiliary rack (22).

6. A modular electromechanical brake based on an inverted planetary roller screw according to claim 1, characterized in that: Both ends of the nut (12) are connected to the outside, and the lead screw (14) extends outward from one end of the nut (12).

7. A modular electromechanical brake based on an inverted planetary roller screw according to claim 1, characterized in that: Bearings (33) are provided between the first gear (18) and the second housing (15), between the second gear (19) and the second housing (15), and between the reversing gear (20) and the second housing (15).

8. A modular electromechanical brake based on an inverted planetary roller screw according to claim 1, characterized in that: The motor (11) is a brushless DC motor.

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