A disengaged wheel-side electric drive system structure

Abstract

This invention relates to a disengaged wheel-side electric drive system structure, installed on the wheel rim of each vehicle. It includes a permanent magnet synchronous motor, a planetary gear reducer, a disengagement mechanism, and a housing. The permanent magnet synchronous motor, planetary gear reducer, and disengagement mechanism are all integrated within the housing. The permanent magnet synchronous motor drives the wheel hub via the planetary gear reducer, and the disengagement mechanism controls the power transmission between the planetary gear reducer and the wheel hub. Compared to existing technologies, this electric drive system structure is independently arranged on the wheel rim, resulting in higher efficiency, increased range of electric vehicles, and greater maneuverability and handling of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle drive systems, and in particular to a disengaged wheel-side electric drive system structure. Background Technology

[0002] Electric vehicles have become the leading direction of the automotive industry in recent years. Their zero-emission and renewable energy functions have been favored and valued by the market. Currently, pure electric vehicles are the main development direction of new energy vehicles, and their drive system efficiency and drive form have attracted much attention. Especially under the condition of limited battery capacity of pure electric vehicles, system efficiency and drive form have been put forward as the main performance and requirements of vehicles.

[0003] Most electric vehicles on the market today are modified from traditional gasoline vehicles. They replace the internal combustion engine with an electric motor, and the transmission layout is similar to that of gasoline vehicles. The mechanical transmission efficiency and drive form have not been significantly changed or improved. The drive control form cannot be designed according to the system efficiency optimization, resulting in increased system power consumption, failure to meet the vehicle's range requirements, and low vehicle economy. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art by providing a disengaged wheel-side electric drive system structure, which improves integration, reduces transmission energy loss, and improves the vehicle's range.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A disengaged wheel-side electric drive system structure is installed on the wheel side of each drive wheel of a car, including a permanent magnet synchronous motor, a planetary gear reducer, a disengagement mechanism, and a housing. The permanent magnet synchronous motor, the planetary gear reducer, and the disengagement mechanism are all integrated and installed in the housing. The permanent magnet synchronous motor is connected to the wheel hub through the planetary gear reducer, and the disengagement mechanism controls the internal gear ring drive of the planetary gear reducer.

[0007] Furthermore, the housing includes the housing of the permanent magnet synchronous motor and the housing of the planetary gear reducer, with the housing and housing being connected separately, and the disengagement mechanism being installed inside the housing.

[0008] Furthermore, the permanent magnet synchronous motor includes a stator assembly, a rotor assembly, and an end cover. The rotor assembly is assembled inside the housing, the end cover is connected to one side of the housing, and a shaft gear is mounted at the end of the rotor assembly for meshing with the input gear shaft of the planetary gear reducer. The shaft gear is cantilevered on the other side of the housing.

[0009] Furthermore, the planetary gear reducer includes an input gear shaft, a sun gear, planet gears, an internal gear ring, a double bearing, a planet carrier assembly, and a coupling gear ring. One end of the input gear shaft is mounted on the housing via a bearing, and the other end is connected to the planet carrier assembly via a bearing. The sun gear is mounted on the input gear shaft. The internal gear ring is mounted inside the housing via a double bearing. The planet gears are mounted on the planet carrier assembly. The sun gear is connected to the internal gear ring via the planet gears. A coupling gear ring is also connected to one side of the internal gear ring. The coupling gear ring is used to connect to the disengagement mechanism. The planet carrier assembly is connected to the wheel hub.

[0010] Furthermore, the working end face of the connecting gear ring is provided with canine teeth or friction plates.

[0011] Furthermore, an oil seal is fitted between the planetary carrier assembly and the input gear shaft, and the planetary carrier assembly and the input gear shaft can rotate relative to each other, with the oil seal rotating with the planetary carrier assembly.

[0012] Furthermore, the disengagement mechanism includes a locking ring tooth seat, a locking ring, a compression spring, and an electromagnetic clutch. The electromagnetic clutch, together with the locking ring tooth seat, is fixed in the housing. The locking ring is mounted on the locking ring tooth seat and can slide relative to it. The compression spring is evenly distributed around the locking ring tooth seat and installed between the locking ring and the locking ring tooth seat. The locking ring is controlled by the electromagnetic clutch and is used to contact the internal gear ring of the planetary gear reducer.

[0013] Furthermore, the disengagement mechanism also includes a position sensor, which is installed on one side of the locking ring and fixed to the housing.

[0014] Furthermore, the permanent magnet synchronous motor, planetary gear reducer, and disengagement mechanism are integrated and share a common oil cooling and lubrication system.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The distributed wheel-side electric drive system structure proposed in this invention installs the disengaged wheel-side electric drive system structure on the wheel-side of the vehicle's drive wheels. Through the independent integration of permanent magnet synchronous motor, planetary reduction system and disengagement mechanism in each electric drive system structure, components such as drive shaft and differential in traditional vehicle structures are eliminated, resulting in high transmission efficiency and improved range of electric vehicles. Furthermore, the high overall integration of each electric drive system structure maximizes the optimization of the vehicle chassis space, facilitating the layout of other systems.

[0017] 2. The electric drive system is independently arranged at the wheel, which can realize more flexible maneuverability and handling of the whole vehicle. The matching of permanent magnet synchronous motor and planetary reduction system can ensure the output of peak torque at the wheel, so that the assembly can operate smoothly in the system's high-efficiency range. This realizes the miniaturization of permanent magnet synchronous motor, and the entire electric drive system can be limited to the wheel hub area.

[0018] 3. The deceleration system adopts a disengaged structure design. The addition of the disengaged mechanism ensures the vehicle's on-demand all-wheel drive and power generation needs, further improving the efficiency of the vehicle's electric drive system and reducing energy consumption. The disengaged wheel-side electric drive system, as an independent drive module, works as needed according to the vehicle's requirements, further improving the vehicle's applicability and reliability.

[0019] 4. The entire motor system and reduction system are interconnected and share a cooling and lubrication system, achieving efficient transmission and heat dissipation of the system assembly. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall invention.

[0021] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0022] Reference numerals: 1. Permanent magnet synchronous motor; 2. Planetary gear reducer; 3. Disengagement mechanism; 11. Shaft gear; 12. Rotor assembly; 13. Stator assembly; 14. End cover; 201. First bearing; 202. Input gear shaft; 203. Second bearing; 204. Sun gear; 205. Planetary gears; 206. Internal gear ring; 207. Double bearing; 208. Planetary carrier assembly; 209. Coupling gear ring; 211. Oil seal; 212. Third bearing; 214. Needle roller bearing; 31. Locking ring seat; 32. Locking ring; 33. Compression spring; 34. Electromagnetic clutch; 35. Position sensor; 4. Housing; 41. Casing; 42. Box. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0024] like Figure 1 and Figure 2 As shown, this embodiment provides a disengaged wheel-side electric drive system structure, installed on the wheel rim of each vehicle, including a permanent magnet synchronous motor 1, a planetary gear reducer 2, and a disengagement mechanism 3. The housing 41 of the permanent magnet synchronous motor 1 and the housing 42 of the planetary gear reducer 2 are separately connected to form a complete housing 4, and the disengagement mechanism 3 is installed inside the housing 42. The permanent magnet synchronous motor 1 is connected to the wheel hub through the planetary gear reducer 2, and the disengagement mechanism 3 controls the transmission of the internal gear ring 206 of the planetary gear reducer 2. The permanent magnet synchronous motor 1, the planetary gear reducer 2, and the disengagement mechanism 3 share a common oil cooling and lubrication system after integration.

[0025] The permanent magnet synchronous motor 1 includes a shaft gear 11, a rotor assembly 12, a stator assembly 13, an end cover 14, and a housing 41. The stator assembly 13 is fixed inside the housing 41, and the rotor assembly 12 is assembled inside the end cover 14 and the housing 41. The shaft gear 11 is mounted at the end of the rotor assembly 12, and the shaft gear 11 is cantilevered on one side of the housing 41 and drives the planetary gear reducer 2.

[0026] The permanent magnet synchronous motor 1 and the planetary gear reducer 2 are driven by meshing shaft gear 11 and input gear shaft 202. The planetary gear reducer 2 includes an input gear shaft 202, a sun gear 204, planet gears 205, an internal gear ring 206, a double bearing 207, a planetary carrier assembly 208, a coupling gear ring 209, a housing 42, an oil seal 211, a needle roller bearing 214, a first bearing 201, a second bearing 203, and a third bearing 212. The sun gear 204 is fixed to the input gear shaft 202. One end of the input gear shaft 202 is mounted to the housing 41 via the first bearing 201, and the other end is mounted inside the planetary carrier assembly 208 via the needle roller bearing 214. An oil seal 211 is installed inside the planetary carrier assembly 208 and acts on the input gear shaft 202. One end of the planetary carrier assembly 208 is mounted on the input gear shaft 202 via a second bearing 203, and the other end is mounted on the housing 42 via a third bearing 212. The housing 42 is also equipped with an oil seal 211, which acts on the planetary carrier assembly 208 to form a seal. The internal gear ring 206 is assembled inside the housing 42 via a double bearing 207, wherein the inner ring of the double bearing 207 is assembled on the internal gear ring 206, and the outer ring of the double bearing 207 is assembled on the housing 42. A coupling gear ring 209 is fixed on one side of the internal gear ring 206, and this coupling gear ring 209 interacts with the disengagement mechanism 3 to realize the disengagement and deceleration functions of the planetary gear reducer 2.

[0027] The disengagement mechanism mainly includes a locking ring tooth seat 31, a locking ring 32, a compression spring 33, an electromagnetic clutch 34, and a position sensor 35. The electromagnetic clutch 34, together with the locking ring tooth seat 31, is fixed inside the housing 42. The locking ring 32 is mounted on the locking ring tooth seat 31 and can slide relative to it but cannot rotate. The compression spring 33 is evenly distributed around the locking ring tooth seat 34 and is mounted between the locking ring 32 and the electromagnetic clutch 34.

[0028] When the electromagnetic clutch 34 is de-energized, the pressure spring 33 presses the locking ring 32 against the engagement gear ring 209. Since the engagement surfaces of the locking ring 32 and the engagement gear ring 209 are made of dog teeth or friction plates, the engagement gear ring 209, together with the inner gear ring 206, forms a locking constraint on the locking ring gear seat 31, thus enabling the planetary gear reducer 2 to perform a reduction function. When the input gear shaft 202 rotates along with the sun gear 204, the inner gear ring 206 brakes, and the planetary carrier assembly 208 reduces power through transmission.

[0029] When the electromagnetic clutch 34 is energized, the locking ring 32 is pulled back, and the locking ring 32 and the engagement gear ring 209 disengage. When the input gear shaft 202 rotates along with the sun gear 204, the internal gear ring 206 and the engagement gear ring 209 spin freely on the double bearing 207, and the planetary gear reducer 2 loses its deceleration function. The gear position of the planetary gear reducer 2 is fed back by the position sensor 35. When the locking ring 32 is locked with the engagement gear ring 209, the position sensor 35 feeds back a gear signal; when the locking ring 32 is separated from the engagement gear ring 209, the position sensor 35 feeds back a neutral signal. The position sensor 35 is fixed on the housing 42.

[0030] In this embodiment, the motor system is integrated into the wheel rim of the drive wheel, eliminating components such as the drive shaft and differential. The drive motor is miniaturized by using a wheel rim reduction system to reduce speed and increase torque. At the same time, the reduction system adopts a disengaged gear structure design, which makes the drive wheel control more flexible and enables timely driving and power generation. The entire motor system and reduction system are interconnected and share a cooling and lubrication system, achieving efficient transmission and heat dissipation of the system assembly.

[0031] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A disengaged wheel-side electric drive system structure, characterized in that, Installed on the wheel rim of the car drive wheel, including permanent magnet synchronous motor (1), planetary gear reducer (2), disengagement mechanism (3) and housing (4). The permanent magnet synchronous motor (1), planetary gear reducer (2) and disengagement mechanism (3) are all integrated and installed in the housing (4). The permanent magnet synchronous motor (1) is connected to the wheel hub through the planetary gear reducer (2). The disengagement mechanism (3) controls the transmission of the internal gear ring (206) of the planetary gear reducer (2). The housing (4) includes the housing (41) of the permanent magnet synchronous motor (1) and the housing (42) of the planetary gear reducer (2). The housing (41) and the housing (42) are connected separately. The disengagement mechanism (3) is installed inside the housing (42). The disengagement mechanism (3) includes a locking ring tooth seat (31), a locking ring (32), a compression spring (33), and an electromagnetic clutch (34). The electromagnetic clutch (34) together with the locking ring tooth seat (31) is fixed inside the housing (42). The locking ring (32) is mounted on the locking ring tooth seat (31) and can slide relative to the locking ring tooth seat (31). The compression spring (33) is evenly distributed around the locking ring tooth seat (31) and installed between the locking ring (32) and the locking ring tooth seat (31). The locking ring (32) is controlled by the electromagnetic clutch (34) and is used to contact the internal gear ring (206) of the planetary gear reducer (2).

2. The structure of the disengaged wheel-side electric drive system according to claim 1, characterized in that, The permanent magnet synchronous motor (1) includes a stator assembly (13), a rotor assembly (12) and an end cover (14). The rotor assembly (12) is assembled inside the housing (41), and the end cover (14) is connected to one side of the housing (41). The rotor assembly (12) is equipped with a shaft gear (11) at the end for meshing with the input gear shaft (202) of the planetary gear reducer (2), and the shaft gear (11) is cantilevered on the other side of the housing (41).

3. The structure of the disengaged wheel-side electric drive system according to claim 1, characterized in that, The planetary gear reducer (2) includes an input gear shaft (202), a sun gear (204), planet gears (205), an internal gear ring (206), a double bearing (207), a planet carrier assembly (208), and a coupling gear ring (209). One end of the input gear shaft (202) is mounted on the housing (41) via a bearing, and the other end is connected to the planet carrier assembly (208) via a bearing. The sun gear (204) is mounted on the input gear shaft (202). The internal gear ring (206) is mounted inside the housing (42) via a double bearing (207). The planetary gear (205) is mounted on the planetary carrier assembly (208). The sun gear (204) is connected to the internal gear ring (206) via the planetary gear (205). A coupling gear ring (209) is also connected to one side of the internal gear ring (206). The coupling gear ring (209) is used to connect to the disengagement mechanism (3). The planetary carrier assembly (208) is connected to the wheel hub.

4. The structure of a disengaged wheel-side electric drive system according to claim 3, characterized in that, The working end face of the connecting gear ring (209) is provided with canine teeth or friction plates.

5. The structure of a disengaged wheel-side electric drive system according to claim 3, characterized in that, An oil seal (211) is fitted between the planetary carrier assembly (208) and the input gear shaft (202). The planetary carrier assembly (208) and the input gear shaft (202) can rotate relative to each other, and the oil seal (211) rotates with the planetary carrier assembly (208).

6. The structure of a disengaged wheel-side electric drive system according to claim 1, characterized in that, The disengagement mechanism (3) also includes a position sensor (35), which is installed on one side of the locking ring (32) and fixed to the housing (42).

7. The structure of a disengaged wheel-side electric drive system according to claim 1, characterized in that, The permanent magnet synchronous motor (1), planetary gear reducer (2) and disengagement mechanism (3) are integrated and share oil cooling and lubrication.

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