8*8 vehicle two-gear hub electric driving system with one-way clutch

Abstract

The invention belongs to the technical field of new energy vehicle electric driving, and particularly relates to an 8 * 8 vehicle two-gear hub electric driving system with a one-way clutch, which comprises a hub motor and a planetary transmission, the planetary transmission comprises a first component, a second component, a third component, a fourth component, a fifth component, a planet row PGS1, a planet row PGS2, a brake B1 and a one-way clutch C1. According to the hub electric drive system, the low gear and the high gear are achieved, and the technical problem that it is difficult to consider the maximum wheel speed and the maximum output torque at the same time in a hub motor direct drive mode and a hub motor matched speed reducer mode is effectively solved. According to the one-way clutch, the gear shifting impact can be reduced in the upshift process, the gear shifting quality is improved, and the problem that the gear shifting smoothness is poor due to the large transmission ratio is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive for new energy vehicles, and in particular relates to an 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch. Background Art

[0002] The wheel hub electric drive system places the power system inside the wheel rim of the vehicle tire, which is a distributed drive form. At present, the wheel hub electric drive system mainly adopts three forms: wheel hub motor direct drive, wheel hub motor matched with reducer, and wheel hub motor matched with transmission.

[0003] The two forms of wheel hub electric drive systems, namely, wheel hub motor direct drive and wheel hub motor matched with reducer, are difficult to take into account the requirements of maximum wheel speed and maximum output torque, resulting in excessive design margin of wheel hub motor and low system power density. With the advancement of wheel hub motor technology, the speed of wheel hub motor is getting higher and higher, and this contradiction is more prominent. In order to give full play to the performance of wheel hub motor and improve the technical indicators of wheel hub electric drive system in terms of power density, efficiency and lightweight, it is necessary to develop a wheel hub electric drive system in the form of wheel hub motor matched with transmission drive. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is: how to provide a two-speed wheel hub electric drive system for an 8×8 vehicle with a one-way clutch, which is required to be able to achieve two gears, a low gear and a high gear. The maximum output torque requirement of the wheel hub electric drive system can be met in the low gear, and the maximum wheel speed requirement of the wheel hub electric drive system can be met in the high gear, so as to solve the technical problem that it is difficult to take both the maximum wheel speed and the maximum output torque into consideration.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides an 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch, the two-speed wheel hub electric drive system comprising: a wheel hub motor (①) and a planetary transmission (②);

[0008] The wheel hub motor (①) comprises: a wheel hub motor stator (6) and a wheel hub motor rotor (7);

[0009] The planetary transmission (②) comprises: a transmission component assembly, a planetary gear assembly, a brake and a one-way clutch;

[0010] The transmission component assembly comprises: a first component (1), a second component (2), a third component (3), a fourth component (4), and a fifth component (5);

[0011] The planetary gear assembly comprises: a first planetary gear PGS1 and a second planetary gear PGS2;

[0012] The brake is brake B1;

[0013] The one-way clutch is a one-way clutch C1;

[0014] The first component (1) is connected to the hub motor rotor (7);

[0015] The fourth component (4) is connected to the hub motor stator (6);

[0016] The first planetary gear PGS1 comprises a first sun gear S1, a first planet carrier CA1 and a first ring gear R1, which are respectively connected to the fourth component (4), the first component (1) and the fifth component (5);

[0017] The second planetary gear PGS2 comprises a second sun gear S2, a second planet carrier CA2 and a second ring gear R2, which are respectively connected to the fifth member (5), the second member (2) and the third member (3);

[0018] The brake B1 is used to brake the third component (3);

[0019] The one-way clutch C1 is used to connect the second member (2) and the fifth member (5).

[0020] When the brake B1 is engaged, the third member (3) is braked to achieve a low gear.

[0021] When the one-way clutch C1 is engaged, the second member (2) and the fifth member (5) are connected and rotate as a whole to achieve a high gear.

[0022] Wherein, the hub motor (①) adopts a permanent magnet synchronous inner rotor motor.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch proposed in the present invention adopts a wheel hub motor matching transmission drive scheme, including a wheel hub motor and a planetary transmission, the wheel hub motor includes a wheel hub motor stator and a wheel hub motor rotor, the planetary transmission includes a first component to a fifth component, a first planetary gear PGS1 and a second planetary gear PGS2, a brake B1 and a one-way clutch C1. The present invention realizes two gears, low gear and high gear, and effectively solves the technical problem that the two forms of wheel hub electric drive systems, namely, direct drive of the wheel hub motor and matching of the wheel hub motor with a reducer, are difficult to take into account the maximum wheel speed and the maximum output torque. The one-way clutch used in the present invention can reduce the shift shock during the upshift process, improve the shift quality, and avoid the problem of poor shift smoothness caused by a large ratio between transmission ratios. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch according to the present invention.

[0026] Among them, ① is the hub motor, ② is the planetary transmission; 1 to 5 are the first to fifth components, PGS1, PGS2 are the first planetary gear and the second planetary gear, B1 is the brake, C1 is the one-way clutch; S1, CA1, R1 are the first sun gear, the first planetary carrier and the second ring gear of the first planetary gear PGS1, S2, CA2, R2 are the second sun gear, the second planetary carrier and the second ring gear of the second planetary gear PGS2; 6 is the stator of the hub motor, 7 is the rotor of the hub motor. DETAILED DESCRIPTION

[0027] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0028] In order to solve the above technical problems, the present invention provides an 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch, the two-speed wheel hub electric drive system comprising: a wheel hub motor (①) and a planetary transmission (②);

[0029] The wheel hub motor (①) comprises: a wheel hub motor stator (6) and a wheel hub motor rotor (7);

[0030] The planetary transmission (②) comprises: a transmission component assembly, a planetary gear assembly, a brake and a one-way clutch;

[0031] The transmission component assembly comprises: a first component (1), a second component (2), a third component (3), a fourth component (4), and a fifth component (5);

[0032] The planetary gear assembly comprises: a first planetary gear PGS1 and a second planetary gear PGS2;

[0033] The brake is brake B1;

[0034] The one-way clutch is a one-way clutch C1;

[0035] The first component (1) is connected to the hub motor rotor (7);

[0036] The fourth component (4) is connected to the hub motor stator (6);

[0037] The first planetary gear PGS1 comprises a first sun gear S1, a first planet carrier CA1 and a first ring gear R1, which are respectively connected to the fourth component (4), the first component (1) and the fifth component (5);

[0038] The second planetary gear PGS2 comprises a second sun gear S2, a second planet carrier CA2 and a second ring gear R2, which are respectively connected to the fifth member (5), the second member (2) and the third member (3);

[0039] The brake B1 is used to brake the third component (3);

[0040] The one-way clutch C1 is used to connect the second member (2) and the fifth member (5).

[0041] When the brake B1 is engaged, the third member (3) is braked to achieve a low gear.

[0042] When the one-way clutch C1 is engaged, the second member (2) and the fifth member (5) are connected and rotate as a whole to achieve a high gear.

[0043] Wherein, the hub motor (①) adopts a permanent magnet synchronous inner rotor motor.

[0044] Example 1

[0045] This embodiment proposes an 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch, including a wheel hub motor ① and a planetary transmission ②, such as Figure 1 shown.

[0046] The hub motor ① includes a hub motor stator 6 and a hub motor rotor 7, and the planetary transmission ② includes a first component ~5, a planetary gear PGS1 and a planetary gear PGS2, a brake B1 and a one-way clutch C1, which are arranged horizontally from left to right, and the planetary gear PGS1 of the planetary transmission ② is nested inside the hub motor ①.

[0047] The wheel hub motor ① adopts a permanent magnet synchronous inner rotor motor, the fourth component is connected to the wheel hub motor stator 6, and the first component is connected to the wheel hub motor rotor 7.

[0048] The planetary gear PGS1 includes a sun gear S1, a planet carrier CA1 and a ring gear R1, which are respectively connected to the fourth component, the first component and the fifth component; the planetary gear PGS2 includes a sun gear S2, a planet carrier CA2 and a ring gear R2, which are respectively connected to the fifth component, the second component and the third component.

[0049] The brake B1 is used to brake the third member, and the one-way clutch C1 is used to connect the second member and the fifth member.

[0050] When the brake B1 is engaged, the third member is braked to achieve a low gear; when the one-way clutch C1 is engaged, the second member is connected to the fifth member and rotates as a whole to achieve a high gear.

[0051] The two-speed wheel hub electric drive system of the present invention is installed in each tire of the 8×8 vehicle, and the inverter used in conjunction with the two-speed wheel hub electric drive system is used to control the operation of the system, and the vehicle integrated controller can coordinate the coordinated operation of the eight systems, thereby realizing the distributed drive of the vehicle. When the two-speed wheel hub electric drive system of the present invention works in low gear, it meets the index requirements of the maximum torque output of the tires of the 8×8 vehicle; when working in high gear, it meets the index requirements of the maximum wheel speed of the 8×8 vehicle.

[0052] like Figure 1 In the illustrated embodiment, when the k values ​​of the first planetary gear PGS1 and the second planetary gear PGS2 are k1=-1.034 and k2=1.465 respectively, parameters of two gears can be obtained, as shown in the following table.

[0053]

[0054] Note: In the table, “0” indicates that the operating parts are combined, and “×” indicates that the operating parts are separated.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical principles of the present invention, several improvements and modifications can be made without changing the connection relationship, such as changing the arrangement position of the planetary gear and the one-way clutch, transforming the first planetary gear into a simple double-star gear, etc. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A two-speed wheel hub electric drive system for an 8×8 vehicle with a one-way clutch, characterized in that: The two-speed wheel hub electric drive system comprises: a wheel hub motor (①) and a planetary transmission (②); The wheel hub motor (①) comprises: a wheel hub motor stator (6) and a wheel hub motor rotor (7); The planetary transmission (②) comprises: a transmission component assembly, a planetary gear assembly, a brake and a one-way clutch; The transmission component assembly comprises: a first component (1), a second component (2), a third component (3), a fourth component (4), and a fifth component (5); The planetary gear assembly comprises: a first planetary gear PGS1 and a second planetary gear PGS2; The brake is brake B1; The one-way clutch is a one-way clutch C1; The first component (1) is connected to the hub motor rotor (7); The fourth component (4) is connected to the hub motor stator (6); The first planetary gear PGS1 comprises a first sun gear S1, a first planet carrier CA1 and a first ring gear R1, which are respectively connected to the fourth component (4), the first component (1) and the fifth component (5); The second planetary gear PGS2 comprises a second sun gear S2, a second planet carrier CA2 and a second ring gear R2, which are respectively connected to the fifth member (5), the second member (2) and the third member (3); The brake B1 is used to brake the third component (3); The one-way clutch C1 is used to connect the second member (2) and the fifth member (5).

2. The 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch as claimed in claim 1, characterized in that: When the brake B1 is engaged, the third member (3) is braked to achieve a low gear.

3. The 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch as claimed in claim 1, characterized in that: When the one-way clutch C1 is engaged, the second member (2) and the fifth member (5) are connected and rotate as a whole, thereby achieving a high gear.

4. The 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch as claimed in claim 1, characterized in that: The hub motor (①) adopts a permanent magnet synchronous inner rotor motor.

5. The 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch as claimed in claim 1, characterized in that: The two-speed wheel hub electric drive system is installed in each tire of the 8×8 vehicle. The inverter used in conjunction with the two-speed wheel hub electric drive system is used to control the operation of the system, and the vehicle integrated controller can coordinate the coordinated work of the eight two-speed wheel hub electric drive systems to achieve distributed drive of the vehicle.

6. The 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch as claimed in claim 1, characterized in that: When the two-speed wheel hub electric drive system operates in low gear, it meets the index requirements of the maximum torque output of the tires of an 8×8 vehicle.

7. The 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch as claimed in claim 1, characterized in that: When the two-speed wheel hub electric drive system operates in high gear, it meets the index requirement of the maximum wheel speed of an 8×8 vehicle.

8. The 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch as claimed in claim 1, characterized in that: The system realizes two gears, low gear and high gear, and effectively solves the technical problem that it is difficult for two types of hub electric drive systems, namely, direct drive of hub motor and matching hub motor with reducer, to take into account both the maximum wheel speed and the maximum output torque.

9. The 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch as claimed in claim 1, characterized in that: The one-way clutch adopted by the system can reduce the gear shifting shock during the upshifting process, improve the gear shifting quality, and avoid the problem of poor gear shifting smoothness caused by a large gear ratio.

10. The 8×8 vehicle two-speed wheel hub electric drive system with a one-way clutch as claimed in claim 1, characterized in that: The system belongs to the technical field of electric drive of new energy vehicles.

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