Motor structure of electronic mechanical braking system and electronic mechanical braking system

Abstract

The utility model discloses a motor structure of an electronic mechanical braking system and the electronic mechanical braking system, the motor structure comprises a motor body, the motor body comprises a shell, an end cover and a motor shaft, the shell is provided with a hollow cavity, the end cover is fixedly arranged at one end part of the shell, the motor shaft can be rotatably arranged on the end cover, and the motor shaft is fixedly arranged on the shell. The motor shaft is located in the cavity of the shell, and one end of the motor shaft penetrates through the end cover and extends out of the cavity of the shell. The motor structure further comprises a speed reducing mechanism connected with the motor shaft in a matched mode, and the speed reducing mechanism is arranged outside the cavity of the shell and arranged on the end cover. In the motor structure, the speed reducing mechanism is integrally arranged on the end cover of the motor, so that the structure is compact and simple, and the space can be saved. In addition, the motor shaft and the speed reducing mechanism are installed on the same end cover, so that the positioning precision is high when the motor shaft and the speed reducing mechanism are connected, the transmission efficiency can be improved, and the structural strength is good.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle braking, in particular to a motor structure of an electronic mechanical braking system and an electronic mechanical braking system. Background Art

[0002] Electromechanical braking systems utilize a brake motor and a reduction mechanism to drive the brakes. They offer a simple structure, responsiveness, smooth load transfer, and high transmission efficiency, eliminating the need for hydraulic piping. They can enhance vehicle safety, handling, and comfort.

[0003] In existing electromechanical braking systems, the brake motor and deceleration mechanism are separate. These require specific structural features for positioning, bolts for secure connection, and O-rings for sealing. This results in a bulky and complex structure, and relatively poor structural strength. Utility Model Content

[0004] The purpose of the utility model is to address the deficiencies in the prior art and to provide a motor structure for an electronic mechanical brake system with a compact structure, high reliability and high structural strength.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A motor structure of an electronic mechanical braking system includes a motor body, the motor body including a shell, an end cover and a motor shaft, the shell having a hollow cavity, the end cover fixedly arranged at one end of the shell, the motor shaft rotatably arranged on the end cover, the motor shaft is located in the cavity of the shell, and one end of the motor shaft passes through the end cover and extends to the outside of the cavity of the shell; the motor structure also includes a reduction mechanism connected to the motor shaft, the reduction mechanism is arranged outside the cavity of the shell and on the end cover.

[0007] In some embodiments, the reduction mechanism includes a gear assembly, the gear assembly includes a first gear and a second gear, the first gear is fixedly disposed on the motor shaft, the second gear is rotatably disposed on the end cover, the first gear and the second gear are meshed with each other, and the diameter of the second gear is larger than the diameter of the first gear.

[0008] In some embodiments, the gear assembly further includes a third gear, the third gear is rotatably disposed on the end cover, the third gear is engaged with the second gear, and the diameter of the third gear is greater than the diameter of the second gear.

[0009] In some embodiments, the reduction mechanism further includes a planetary gear assembly and a large ring gear fixedly disposed on the end cover, and the planetary gear assembly is rotatably disposed in the large ring gear and is cooperatively connected to the large ring gear.

[0010] In some embodiments, the planetary gear assembly includes a sun gear, a planetary carrier and multiple planetary gears, the sun gear is fixedly connected to or integrally arranged with the third gear, and the sun gear is coaxially arranged with the third gear, the planetary carrier is rotatably arranged on the end cover, and each of the planetary gears is rotatably arranged on the planetary carrier, and each of the planetary gears is respectively engaged with the sun gear and the large ring gear.

[0011] In some embodiments, the motor structure further includes a retaining frame fixedly disposed on the end cover, and the third gear, the sun gear, and the planetary carrier are all rotatably disposed on the retaining frame.

[0012] In some embodiments, the first gear, the second gear, and the third gear are all helical gears.

[0013] In some embodiments, the end cover and the shell are fixedly connected by laser welding; or, the end cover and the shell are fixedly connected by bolts.

[0014] In some embodiments, the motor body further includes a rotor and a first bearing, the rotor being located in the cavity of the housing, the first bearing being arranged between the motor shaft and the end cover, the rotor and the first bearing being both sleeved on the motor shaft and both being connected to the motor shaft by interference fit.

[0015] The present invention also provides an electronic mechanical braking system, which has the motor structure as described in any one of the above items.

[0016] Due to the application of the above technical solution, the present invention has the following advantages over the prior art: In the motor structure of the electronic mechanical brake system of the present invention, the reduction mechanism is integrated into the motor end cap, resulting in a compact and simple structure that saves space. Furthermore, the motor shaft and reduction mechanism are mounted on the same end cap, which ensures high positioning accuracy when connected to the motor shaft and reduction mechanism, improves transmission efficiency, and also provides good structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attachment Figure 1 is a schematic top view of the motor structure of the electronic mechanical brake system of this embodiment;

[0018] Attachment Figure 2 For attachment Figure 1 Schematic cross-sectional view along line AA (enlarged view);

[0019] Attachment Figure 3 FIG. 1 is an exploded schematic diagram of the motor structure of the electromechanical brake system of this embodiment.

[0020] Among them: 11. Housing; 12. End cover; 13. Motor shaft; 14. Rotor; 15. Stator; 16. First bearing; 17. Second bearing; 21. First gear; 22. Second gear; 23. First gear shaft; 24. Third gear; 25. Retaining frame; 251. Second gear shaft; 261. Sun gear; 262. Planetary gear; 263. Planetary carrier; 264. Third gear shaft; 27. Ring gear; 3. Cover. DETAILED DESCRIPTION

[0021] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0024] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0027] like Figures 1 to 3 As shown, the motor structure of the electronic mechanical brake system of the present invention includes a motor body and a speed reduction mechanism.

[0028] The motor body includes a housing 11 , an end cover 12 , a motor shaft 13 , a rotor 14 , a stator 15 , a first bearing 16 and a second bearing 17 .

[0029] The housing 11 has a hollow cavity with one end open. The end cover 12 is fixedly disposed at the open end of the cavity to close the cavity of the housing 11 .

[0030] There are many ways to fix the end cover 12 to the housing 11, such as by laser welding; or by bolts.

[0031] The motor shaft 13 is rotatably disposed on the end cover 12 . Most of the motor shaft 13 is located in the cavity of the housing 11 , and one end thereof passes through the end cover 12 and extends to the outside of the cavity of the housing 11 .

[0032] The rotor 14 is located in the cavity of the housing 11 and is sleeved on the motor shaft 13. In this embodiment, the rotor 14 and the motor shaft 13 are connected by an interference fit, so that the rotor 14 and the motor shaft 13 rotate synchronously.

[0033] The stator 15 is located in the cavity of the housing 11 and is sleeved on the outside of the rotor 14 .

[0034] The first bearing 16 is disposed between the motor shaft 13 and the end cover 12 , and the first bearing 16 and the motor shaft 13 are connected by interference fit.

[0035] The second bearing 17 is disposed between the motor shaft 13 and the housing 11 , and the second bearing 17 and the motor shaft 13 are connected by interference fit.

[0036] The reduction mechanism is connected to or cooperates with the motor shaft 13, so that when the motor shaft 13 rotates, the reduction mechanism is driven to operate, and the reduction mechanism acts on the brake caliper mechanism through the mechanical transmission mechanism to lock the vehicle tires and perform braking.

[0037] The reduction mechanism is positioned outside the cavity of the housing 11 and integrated with the end cap 12. This integration of the reduction mechanism and the motor body results in a compact and simple overall structure, saving space. Furthermore, the motor shaft 13 and the reduction mechanism are mounted on the same component, the end cap 12, ensuring high positioning accuracy when connected to the reduction mechanism, improving transmission efficiency and enhancing structural strength.

[0038] The reduction mechanism includes a gear assembly, which includes a first gear 21 and a second gear 22. The first gear 21 is fixedly arranged on the motor shaft 13, and the second gear 22 is rotatably arranged on the end cover 12. The first gear 21 is meshed with the second gear 22, and the diameter of the second gear 22 is larger than the diameter of the first gear 21.

[0039] Specifically, a first gear shaft 23 is fixedly provided on the end cover 12 , and the second gear 22 is sleeved on the first gear shaft 23 and is rotatable around the first gear shaft 23 .

[0040] The gear assembly further includes a third gear 24 , which is rotatably disposed on the end cover 12 . The third gear 24 is meshed with the second gear 22 , and a diameter of the third gear 24 is greater than a diameter of the second gear 22 .

[0041] Specifically, the reduction mechanism further includes a retaining frame 25 , which is fixedly connected to the end cover 12 . A second gear shaft 251 is fixedly provided on the retaining frame 25 . The third gear 24 is sleeved on the second gear shaft 251 and is rotatable around the second gear shaft 251 .

[0042] In this embodiment, the retainer 25 is pressed onto the end surface of the third gear 24.

[0043] In this embodiment, the first gear 21, the second gear 22 and the third gear 24 are all helical gears, which makes the speed reduction mechanism run smoothly, with low noise and good load-bearing capacity.

[0044] The gear assembly further includes a planetary gear assembly, which includes a sun gear 261 , planetary gears 262 and a planet carrier 263 .

[0045] The sun gear 261 is coaxially arranged with the third gear 24 , and the two are fixedly connected or integrally arranged, that is, the sun gear 261 is sleeved on the second gear shaft 251 and is rotatable around the second gear shaft 251 .

[0046] The planet carrier 263 is rotatably disposed on the end cover 12. In this embodiment, the planet carrier 263 is rotatably connected to the second gear shaft 251.

[0047] There are multiple planetary gears 262, and multiple third gear shafts 264 are provided on the planetary carrier 263. The third gear shafts 264 are arranged in a one-to-one correspondence with the planetary gears 262. Each planetary gear 262 is sleeved on the third gear shaft 264 and can be rotatable around the third gear shaft 264. Each planetary gear 262 is respectively engaged with the sun gear 261.

[0048] The reduction mechanism further includes a large ring gear 27 , which is fixedly mounted on the end cover 12 . The sun gear 261 and the planetary gears 262 are located within the large ring gear 27 , and the planetary gears 262 are respectively engaged with the large ring gear 27 .

[0049] The motor structure further includes a cover 3 , which is fixedly connected to the end cover 12 , and the reduction mechanism is accommodated in a receiving space formed by the cover 3 and the end cover 12 .

[0050] In this embodiment, when the motor structure is assembled, the stator 15 is installed in the housing 11. The second bearing 17, the rotor 14, and the first bearing 16 are respectively press-fitted onto the motor shaft 13 by interference fit, and then the motor shaft 13 is installed on the end cover 12. The first gear 21 is press-fitted onto the end of the motor shaft 13 by interference fit, the second gear 22 is installed on the first gear shaft 23 by clearance fit, and the third gear 24 is installed on the end cover 12 through the retaining frame 25. The large ring gear 27 is press-fitted onto the end cover 12 by interference fit, and each planetary gear 262 is installed on the planetary carrier 263, and the planetary carrier 263 is connected to the retaining frame 25. Finally, after the end cover 12 is connected to the housing 11, the cover 3 is connected to the end cover 12.

[0051] The working principle of this motor structure is as follows:

[0052] When the motor shaft 13 rotates, it drives the first gear 21 to rotate synchronously. The meshing of the first gear 21 and the second gear 22 drives the second gear 22 to rotate about the first gear shaft 23. The meshing of the third gear 24 with the second gear 22 drives the third gear 24 to rotate. The rotation of the third gear 24 rotates the sun gear 261, which in turn drives the planetary gears 262 to rotate about the third gear shaft 264. Simultaneously, the planetary carrier 263 drives the planetary gears 262 to rotate, resulting in a low-speed, high-torque output.

[0053] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A motor structure of an electronic mechanical brake system, comprising a motor body, characterized in that: The motor body includes a shell, an end cover and a motor shaft. The shell has a hollow cavity. The end cover is fixedly arranged at one end of the shell. The motor shaft is rotatably arranged on the end cover. The motor shaft is located in the cavity of the shell, and one end of the motor shaft passes through the end cover and extends to the outside of the cavity of the shell. The motor structure also includes a reduction mechanism that is connected to the motor shaft. The reduction mechanism is arranged outside the cavity of the shell and on the end cover.

2. The motor structure of the electronic mechanical brake system according to claim 1, characterized in that: The deceleration mechanism includes a gear assembly, which includes a first gear and a second gear. The first gear is fixedly arranged on the motor shaft, and the second gear is rotatably arranged on the end cover. The first gear and the second gear are meshed with each other, and the diameter of the second gear is larger than the diameter of the first gear.

3. The motor structure of the electronic mechanical brake system according to claim 2, characterized in that: The gear assembly further includes a third gear, which is rotatably disposed on the end cover and meshes with the second gear. The diameter of the third gear is greater than that of the second gear.

4. The motor structure of the electronic mechanical brake system according to claim 3, characterized in that: The speed reduction mechanism further includes a planetary gear assembly and a large gear ring fixedly arranged on the end cover. The planetary gear assembly is rotatably arranged in the large gear ring and is cooperatively connected with the large gear ring.

5. The motor structure of the electronic mechanical brake system according to claim 4, characterized in that: The planetary gear assembly includes a sun gear, a planet carrier and multiple planetary gears. The sun gear is fixedly connected to or integrally arranged with the third gear, and the sun gear and the third gear are coaxially arranged. The planet carrier is rotatably arranged on the end cover, and each of the planetary gears is rotatably arranged on the planet carrier, and each of the planetary gears is respectively engaged with the sun gear and the large ring gear.

6. The motor structure of the electronic mechanical brake system according to claim 5, characterized in that: The motor structure further includes a retaining frame fixedly disposed on the end cover, and the third gear, the sun gear and the planet carrier are all rotatably disposed on the retaining frame.

7. The motor structure of the electromechanical brake system according to claim 3, characterized in that: The first gear, the second gear and the third gear are all helical gears.

8. The motor structure of the electromechanical brake system according to claim 1, characterized in that: The end cover and the shell are fixedly connected by laser welding; or, the end cover and the shell are fixedly connected by bolts.

9. The motor structure of the electromechanical brake system according to claim 1, characterized in that: The motor body also includes a rotor and a first bearing. The rotor is located in the cavity of the shell. The first bearing is arranged between the motor shaft and the end cover. The rotor and the first bearing are both sleeved on the motor shaft and are connected to the motor shaft through interference fit.

10. An electromechanical braking system, characterized in that: The motor has the structure as claimed in any one of claims 1 to 9.

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