Four-gear hub electric driving system of off-road vehicle

Abstract

The invention belongs to the technical field of electric driving of new energy vehicles, and particularly relates to a four-gear hub electric driving system of an off-road vehicle, which comprises a hub motor and a planetary transmission. The hub motor comprises a hub motor stator and a hub motor rotor, the planetary transmission comprises components 1-7, planet rows PGS1, PGS2 and PGS3, brakes B1 and B2 and one-way clutches C1 and C2, and four forward gears can be achieved. By means of the one-way clutch, the size and weight of the system can be reduced to achieve light weight, the four forward gears are simple gear shifting, the difficulty of the control system can be reduced, planet rows PGS2 and PGS3 can adopt an equal-k-value structure to simplify the variety of gears so as to improve the economical efficiency of the system, and the transmission ratio range of the four forward gears is wider.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive of new energy vehicles, and in particular relates to a four-speed wheel hub electric drive system for off-road vehicles. Background Art

[0002] The wheel hub electric drive system places the power system inside the vehicle wheel rim, 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. Off-road vehicles mainly adopt the form of wheel hub motor matched with reducer.

[0003] The driving conditions of off-road vehicles are complex, and the wheels need to output greater driving torque. The existing hub electric drive system with a hub motor and a reducer is difficult to take into account the requirements of maximum wheel speed and maximum output torque, resulting in excessive design margin of the hub motor and low system power density. With the advancement of hub motor technology, the speed of the hub motor is getting higher and higher, and this contradiction is more prominent. In order to give full play to the performance of the hub motor and improve the technical indicators of the hub electric drive system in terms of power density, cost and lightweight, it is necessary to develop a hub electric drive system with a hub motor and a 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 four-speed wheel hub electric drive system for off-road vehicles, which adopts a wheel hub motor matched with a transmission drive form to achieve four forward gears. The transmission ratio range is wide, and the maximum output torque requirement of the wheel hub electric drive system can be met in the first gear, and the maximum wheel speed requirement of the wheel hub electric drive system can be met in the fourth gear, so as to solve the technical problem that the maximum wheel speed and maximum driving torque of off-road vehicles are difficult to take into account. At the same time, it is necessary to solve the problem of increased volume and weight caused by a multi-speed transmission, and reduce the cost of the drive system.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a four-speed wheel hub electric drive system for an off-road vehicle, the four-speed wheel hub electric drive system for an off-road vehicle comprising: a wheel hub motor (①) and a planetary transmission (②);

[0008] The wheel hub motor (①) comprises: a wheel hub motor stator (8) and a wheel hub motor rotor (9);

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

[0010] The transmission component assembly comprises: a first component (1), a second component (2), a third component (3), a fourth component (4), a fifth component (5), a sixth component (6), and a seventh component (7);

[0011] The planetary gear assembly comprises: a first planetary gear PGS1, a second planetary gear PGS2 and a third planetary gear PGS3;

[0012] The brake assembly comprises: a first brake B1 and a second brake B2;

[0013] The one-way clutch assembly includes: a first one-way clutch C1 and a second one-way clutch C2;

[0014] The hub motor rotor (9) is connected to the first component (1);

[0015] The hub motor stator (8) is connected to the seventh component (7);

[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 seventh component (7), 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 sixth component (6), the third component (3) and the fourth component (4);

[0018] The third planetary gear PGS3 comprises a third sun gear S3, a third planet carrier CA3 and a third ring gear R3, which are respectively connected to the fourth component (4), the third component (3) and the second component (2);

[0019] The first brake B1 is used for braking the third component (3);

[0020] The second brake B2 is used for braking the fourth member (4);

[0021] The first one-way clutch C1 is used to connect the fifth member (5) and the sixth member (6);

[0022] The second one-way clutch C2 is used to connect the third member (3) and the fifth member (5).

[0023] When the first one-way clutch C1 and the first brake B1 are combined, the fifth member (5) and the sixth member (6) are connected and rotate as a whole, and the third member (3) is braked to achieve the first gear.

[0024] When the first one-way clutch C1 and the second brake B2 are engaged, the fifth member (5) and the sixth member (6) are connected and rotate as a whole, and the fourth member (4) is braked to achieve the second gear.

[0025] When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the fifth member (5) and the sixth member (6) are connected and rotate as a whole, and the third member (3) and the fifth member (5) are connected and rotate as a whole, thereby realizing the third gear.

[0026] When the second one-way clutch C2 and the second brake B2 are engaged, the third member (3) and the fifth member (5) are connected and rotate as a whole, and the fourth member (4) is braked, thereby realizing the fourth gear.

[0027] Wherein, the hub motor (①) adopts a permanent magnet synchronous inner rotor motor.

[0028] (III) Beneficial effects

[0029] Compared with the wheel hub electric drive system in the form of a wheel hub motor matched with a reducer adopted by existing off-road vehicles, the four-speed wheel hub electric drive system for off-road vehicles proposed in the present invention adopts a wheel hub motor matched with a four-speed transmission 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, and the planetary transmission includes a first component 1 to a seventh component 7, planetary gears PGS1, PGS2 and PGS3, brakes B1 and B2, and one-way clutches C1 and C2, which can realize four forward gears. The one-way clutch has a compact structure, small size and light weight, which can reduce the size and weight of the system to achieve lightweight; the operating scheme of the four forward gears can realize a single shift of only one operating member, which is a simple shift, which can reduce the difficulty of shift control, and at the same time, can improve the shift quality, ensure the smoothness of the shift, and reduce the shift shock. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the four-speed wheel hub electric drive system for an off-road vehicle of the present invention.

[0031] Among them, ①——wheel hub motor, ②——planetary transmission;

[0032] 1-7——first component, second component, third component, fourth component, fifth component, sixth component, seventh component;

[0033] PGS1, PGS2 and PGS3 - the first planetary gear, the second planetary gear and the third planetary gear;

[0034] B1, B2——first brake, second brake;

[0035] C1, C2——first one-way clutch, second one-way clutch;

[0036] S1, CA1, R1 - the first sun gear, the first planet carrier and the first ring gear of the first planet row PGS1, S2, CA2, R2 - the second sun gear, the second planet carrier and the second ring gear of the second planet row PGS2, S3, CA3, R3 - the third sun gear, the third planet carrier and the third ring gear of the third planet row PGS3;

[0037] 8——wheel hub motor stator, 9——wheel hub motor rotor. DETAILED DESCRIPTION

[0038] 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.

[0039] In order to solve the above technical problems, the present invention provides a four-speed wheel hub electric drive system for an off-road vehicle, the four-speed wheel hub electric drive system for an off-road vehicle comprising: a wheel hub motor (①) and a planetary transmission (②);

[0040] The wheel hub motor (①) comprises: a wheel hub motor stator (8) and a wheel hub motor rotor (9);

[0041] The planetary transmission (②) comprises: a transmission component assembly, a planetary gear assembly, a brake assembly and a one-way clutch assembly;

[0042] The transmission component assembly comprises: a first component (1), a second component (2), a third component (3), a fourth component (4), a fifth component (5), a sixth component (6), and a seventh component (7);

[0043] The planetary gear assembly comprises: a first planetary gear PGS1, a second planetary gear PGS2 and a third planetary gear PGS3;

[0044] The brake assembly comprises: a first brake B1 and a second brake B2;

[0045] The one-way clutch assembly includes: a first one-way clutch C1 and a second one-way clutch C2;

[0046] The hub motor rotor (9) is connected to the first component (1);

[0047] The hub motor stator (8) is connected to the seventh component (7);

[0048] 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 seventh component (7), the first component (1) and the fifth component (5);

[0049] 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 sixth component (6), the third component (3) and the fourth component (4);

[0050] The third planetary gear PGS3 comprises a third sun gear S3, a third planet carrier CA3 and a third ring gear R3, which are respectively connected to the fourth component (4), the third component (3) and the second component (2);

[0051] The first brake B1 is used for braking the third component (3);

[0052] The second brake B2 is used for braking the fourth member (4);

[0053] The first one-way clutch C1 is used to connect the fifth member (5) and the sixth member (6);

[0054] The second one-way clutch C2 is used to connect the third member (3) and the fifth member (5).

[0055] When the first one-way clutch C1 and the first brake B1 are combined, the fifth member (5) and the sixth member (6) are connected and rotate as a whole, and the third member (3) is braked to achieve the first gear.

[0056] When the first one-way clutch C1 and the second brake B2 are engaged, the fifth member (5) and the sixth member (6) are connected and rotate as a whole, and the fourth member (4) is braked to achieve the second gear.

[0057] When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the fifth member (5) and the sixth member (6) are connected and rotate as a whole, and the third member (3) and the fifth member (5) are connected and rotate as a whole, thereby realizing the third gear.

[0058] When the second one-way clutch C2 and the second brake B2 are engaged, the third member (3) and the fifth member (5) are connected and rotate as a whole, and the fourth member (4) is braked, thereby realizing the fourth gear.

[0059] Wherein, the hub motor (①) adopts a permanent magnet synchronous inner rotor motor.

[0060] Example 1

[0061] The off-road vehicle four-speed wheel hub electric drive system proposed in this embodiment includes a wheel hub motor ① and a planetary transmission ②, which are arranged horizontally from left to right. The planetary gear PGS1 of the planetary transmission ② is nested inside the wheel hub motor ①. Figure 1 shown.

[0062] The wheel hub motor ① includes a wheel hub motor stator 8 and a wheel hub motor rotor 9, and the planetary transmission ② includes components 1-7, planetary gears PGS1-PGS3, brakes B1-B2 and one-way clutches C1-C2.

[0063] The wheel hub motor ① may adopt a permanent magnet synchronous inner rotor motor, the wheel hub motor rotor 9 is connected to the component 1, and the wheel hub motor stator 8 is connected to the component 7.

[0064] The planetary gear PGS1 includes a sun gear S1, a planet carrier CA1 and a ring gear R1, which are respectively connected to component 7, component 1 and component 5; the planetary gear PGS2 includes a sun gear S2, a planet carrier CA2 and a ring gear R2, which are respectively connected to component 6, component 3 and component 4; the planetary gear PGS3 includes a sun gear S3, a planet carrier CA3, a ring gear R3, which are respectively connected to component 4, component 3 and component 2.

[0065] The brake B1 is used for braking the member 3 , and the brake B2 is used for braking the member 4 ; the one-way clutch C1 is used for connecting the member 5 and the member 6 , and the one-way clutch C2 is used for connecting the member 3 and the member 5 .

[0066] When the one-way clutch C1 and the brake B1 are combined, the components 5 and 6 are connected and rotate as a whole, and the component 3 is braked to achieve the first gear;

[0067] When the one-way clutch C1 and the brake B2 are engaged, the components 5 and 6 are connected and rotate as a whole, and the component 4 is braked to achieve the second gear;

[0068] When the one-way clutch C1 and the one-way clutch C2 are combined, the components 5 and 6 are connected and rotate as a whole, and the components 3 and 5 are connected and rotate as a whole, so as to realize the third gear;

[0069] When the one-way clutch C2 and the brake B2 are combined, components 3 and 5 are connected and rotate as a whole, and component 4 is braked to achieve the fourth gear.

[0070] like Figure 1 In the illustrated embodiment, when the k values ​​of the planetary gears PGS1 to PGS3 are k1 = -1.073, k2 = 2.50 and k3 = 2.50 respectively, the parameters of the four gears can be obtained, which are listed in the following table.

[0071]

[0072] Note: In the table, “0” indicates that the operating parts are combined, and “×” indicates that the operating parts are separated.

[0073] In this example, the planetary gears PGS2 and PGS3 use equal k-value structural parameters, and the gear tooth parameters of the sun gear, planetary gear and ring gear of the two planetary gears can be designed in a unified manner, which reduces the types of gears, reduces the gear processing cost, and improves the economy of the system; in this example, the transmission ratio range of the four forward gears is wider, reaching 8.75.

[0074] 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 four-speed wheel hub electric drive system for an off-road vehicle, characterized in that: The off-road vehicle four-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 (8) and a wheel hub motor rotor (9); The planetary transmission (②) comprises: a transmission component assembly, a planetary gear assembly, a brake assembly and a one-way clutch assembly; The transmission component assembly comprises: a first component (1), a second component (2), a third component (3), a fourth component (4), a fifth component (5), a sixth component (6), and a seventh component (7); The planetary gear assembly comprises: a first planetary gear PGS1, a second planetary gear PGS2 and a third planetary gear PGS3; The brake assembly comprises: a first brake B1 and a second brake B2; The one-way clutch assembly includes: a first one-way clutch C1 and a second one-way clutch C2; The hub motor rotor (9) is connected to the first component (1); The hub motor stator (8) is connected to the seventh component (7); 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 seventh component (7), 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 sixth component (6), the third component (3) and the fourth component (4); The third planetary gear PGS3 comprises a third sun gear S3, a third planet carrier CA3 and a third ring gear R3, which are respectively connected to the fourth component (4), the third component (3) and the second component (2); The first brake B1 is used for braking the third component (3); The second brake B2 is used for braking the fourth member (4); The first one-way clutch C1 is used to connect the fifth member (5) and the sixth member (6); The second one-way clutch C2 is used to connect the third member (3) and the fifth member (5).

2. The off-road vehicle four-speed wheel hub electric drive system according to claim 1, characterized in that: When the first one-way clutch C1 and the first brake B1 are engaged, the fifth member (5) and the sixth member (6) are connected and rotate as a whole, and the third member (3) is braked to achieve the first gear.

3. The off-road vehicle four-speed wheel hub electric drive system according to claim 2, characterized in that: When the first one-way clutch C1 and the second brake B2 are engaged, the fifth member (5) and the sixth member (6) are connected and rotate as a whole, and the fourth member (4) is braked to achieve the second gear.

4. The off-road vehicle four-speed wheel hub electric drive system according to claim 3, characterized in that: When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the fifth member (5) and the sixth member (6) are connected and rotate as a whole, and the third member (3) and the fifth member (5) are connected and rotate as a whole, thereby realizing the third gear.

5. The off-road vehicle four-speed wheel hub electric drive system according to claim 4, characterized in that: When the second one-way clutch C2 and the second brake B2 are engaged, the third member (3) and the fifth member (5) are connected and rotate as a whole, and the fourth member (4) is braked, thereby realizing the fourth gear.

6. The off-road vehicle four-speed wheel hub electric drive system according to claim 5, characterized in that: The hub motor (①) adopts a permanent magnet synchronous inner rotor motor.

7. The off-road vehicle four-speed wheel hub electric drive system according to claim 6, characterized in that: In the system, the one-way clutch has a compact structure, small size and light weight, which can reduce the volume and weight of the system to achieve lightweight.

8. The off-road vehicle four-speed wheel hub electric drive system according to claim 6, characterized in that: In the system, the operating schemes of the four forward gears can achieve one gear shift with only one operating element switched, which are all simple gear shifts and can reduce the difficulty of gear shift control.

9. The off-road vehicle four-speed wheel hub electric drive system according to claim 6, characterized in that: The system can improve the gear shift quality, ensure the gear shift smoothness and reduce the gear shift shock.

10. The off-road vehicle four-speed wheel hub electric drive system according to claim 6, characterized in that: The system belongs to the technical field of electric drive of new energy vehicles.

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