Heavy 4*4 off-road vehicle four-gear hub electric drive system

Abstract

The invention belongs to the technical field of new energy vehicle electric drive, and particularly relates to a heavy 4 * 4 off-road vehicle four-gear hub electric drive system 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-PGS3, brakes B1-B2 and one-way clutches C1-C2, and four forward gears can be achieved. The transmission ratio of the forward gear is relatively uniform, the power and the high-efficiency interval of the hub motor can be effectively utilized, and the use requirements of 10-ton heavy 4 * 4 off-road vehicles can be met.

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 a heavy-duty 4×4 off-road vehicle. 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 the maximum wheel speed and the maximum output torque, resulting in excessive design margins for 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. For this reason, it is necessary to develop a hub electric drive system with a hub motor and a transmission drive. For 10-ton heavy-duty 4×4 off-road vehicles, in order to more effectively utilize the power and high efficiency range of the hub motor, the transmission ratio of the forward gear is required to be relatively uniform. 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 heavy-duty 4×4 off-road vehicles, which adopts a wheel hub motor matched with a transmission drive form to achieve four forward gears. 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 the maximum driving torque of the off-road vehicle are difficult to take into account. The transmission ratio of the intermediate gear should be relatively uniform to give full play to the power of the wheel hub motor.

[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 a heavy-duty 4×4 off-road vehicle, the four-speed wheel hub electric drive system for a heavy-duty 4×4 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 member 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 third component (3), the sixth component (6) 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 fifth component (5), the second component (2) and the sixth component (6);

[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 third member (3) and the fifth member (5);

[0022] The second one-way clutch C2 is used to connect the fourth member (4) and the second member (2).

[0023] When the first brake B1 and the second brake B2 are combined, the third component (3) and the fourth component (4) are braked to achieve the first gear.

[0024] When the first one-way clutch C1 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 to achieve the second gear.

[0025] When the second one-way clutch C2 and the first brake B1 are engaged, the fourth member (4) and the second member (2) are connected and rotate as a whole, and the third member (3) is braked to achieve the third gear.

[0026] When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the third member (3) and the fifth member (5) are connected and rotate as a whole, and the fourth member (4) and the second member (2) are connected and rotate as a whole, 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 heavy-duty 4×4 off-road vehicles proposed in the present invention adopts a wheel hub motor matched with a four-speed transmission solution, 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 components 1 to 7, planetary gears PGS1 to PGS3, brakes B1 to B2 and one-way clutches C1 to C2, which can achieve four forward gears. The transmission ratios of the four forward gears can achieve a relatively uniform ratio design, which can make full use of the power and high efficiency range of the wheel hub motor, and can effectively solve the technical problem that it is difficult to balance the maximum wheel speed and maximum driving torque of a 10-ton heavy-duty 4×4 off-road vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a four-speed wheel hub electric drive system for a heavy-duty 4×4 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 a heavy-duty 4×4 off-road vehicle, the four-speed wheel hub electric drive system for a heavy-duty 4×4 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 member 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 third component (3), the sixth component (6) 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 fifth component (5), the second component (2) and the sixth component (6);

[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 fourth member (4) and the second member (2);

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

[0055] When the first brake B1 and the second brake B2 are combined, the third component (3) and the fourth component (4) are braked to achieve the first gear.

[0056] When the first one-way clutch C1 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 to achieve the second gear.

[0057] When the second one-way clutch C2 and the first brake B1 are engaged, the fourth member (4) and the second member (2) are connected and rotate as a whole, and the third member (3) is braked to achieve the third gear.

[0058] When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the third member (3) and the fifth member (5) are connected and rotate as a whole, and the fourth member (4) and the second member (2) are connected and rotate as a whole, thereby realizing the fourth gear.

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

[0060] This embodiment 1

[0061] The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle proposed in this embodiment includes a wheel hub motor (①) and a planetary transmission (②), which are arranged horizontally from left to right. The first planetary gear PGS1 of the planetary transmission (②) is nested inside the wheel hub motor (①). Figure 1 shown.

[0062] The hub motor (①) includes a hub motor stator (8) and a hub motor rotor (9), and the planetary transmission (②) includes a first component (1) to a seventh component 7, a first planetary gear PGS1 to a third planetary gear PGS3, a first brake B1 to a second brake B2, and a first one-way clutch C1 to a second one-way clutch C2.

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

[0064] The first planetary gear PGS1 comprises a sun gear S1, a planetary carrier CA1 and a 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 sun gear S2, a planetary carrier CA2 and a ring gear R2, which are respectively connected to the third component (3), the sixth component (6) and the fourth component (4); the third planetary gear PGS3 comprises a sun gear S3, a planetary carrier CA3 and a ring gear R3, which are respectively connected to the fifth component (5), the second component (2) and the sixth component (6).

[0065] The first brake B1 is used for braking the third component (3), and the second brake B2 is used for braking the fourth component (4);

[0066] The first one-way clutch C1 is used to connect the fourth member (4) and the second member (2), and the second one-way clutch C2 is used to connect the third member (3) and the fifth member (5).

[0067] When the first brake B1 and the second brake B2 are combined, the third component (3) and the fourth component (4) are braked to achieve the first gear;

[0068] When the first one-way clutch C1 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 to achieve the second gear;

[0069] When the second one-way clutch C2 and the first brake B1 are engaged, the fourth member (4) and the second member (2) are connected and rotate as a whole, and the third member (3) is braked to achieve the third gear;

[0070] When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the third member (3) and the fifth member (5) are connected and rotate as a whole, and the fourth member (4) and the second member (2) are connected and rotate as a whole, thereby realizing the fourth gear.

[0071] like Figure 1 In the illustrated embodiment, when the k values ​​of the first planetary gears PGS1 to PGS3 are k1 = -1.073, k2 = 2.50 and k3 = 1.50 respectively, parameters of four gears can be obtained, which are listed in the following table.

[0072]

[0073]

[0074] Note: In the table, “0” indicates that the operating parts are combined, and “×” indicates that the operating parts are separated.

[0075] In this example, the transmission ratio of the forward gear is 1.23-1.43, achieving a relatively uniform ratio design and making full use of the power and high efficiency range of the hub motor; by improving the k value design of the second planetary gears PGS2 and PGS3, a more uniform transmission ratio ratio can be obtained.

[0076] 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 a heavy-duty 4×4 off-road vehicle, characterized in that: The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle 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 member 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 third component (3), the sixth component (6) 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 fifth component (5), the second component (2) and the sixth component (6); 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 third member (3) and the fifth member (5); The second one-way clutch C2 is used to connect the fourth member (4) and the second member (2).

2. The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle as claimed in claim 1, characterized in that: When the first brake B1 and the second brake B2 are combined, the third component (3) and the fourth component (4) are braked to achieve the first gear.

3. The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle as claimed in claim 2, characterized in that: When the first one-way clutch C1 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 to achieve the second gear.

4. The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle as claimed in claim 3, characterized in that: When the second one-way clutch C2 and the first brake B1 are engaged, the fourth member (4) and the second member (2) are connected and rotate as a whole, and the third member (3) is braked to achieve the third gear.

5. The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle as claimed in claim 4, characterized in that: When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the third member (3) and the fifth member (5) are connected and rotate as a whole, and the fourth member (4) and the second member (2) are connected and rotate as a whole, thereby realizing the fourth gear.

6. The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle as claimed in claim 5, characterized in that: The hub motor (①) adopts a permanent magnet synchronous inner rotor motor.

7. The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle as claimed in claim 6, characterized in that: The system achieves four forward gears.

8. The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle as claimed in claim 6, characterized in that: The transmission ratios of the four forward gears of the system can achieve a relatively uniform ratio design, which can fully utilize the power and high efficiency range of the hub motor, and can effectively solve the technical problem that it is difficult to take into account both the maximum wheel speed and the maximum driving torque of a 10-ton heavy-duty 4×4 off-road vehicle.

9. The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle as claimed in claim 6, characterized in that: The system belongs to the technical field of electric drive of new energy vehicles.

10. The four-speed wheel hub electric drive system for a heavy-duty 4×4 off-road vehicle as claimed in claim 6, characterized in that: The system can meet the maximum output torque requirement of the hub electric drive system in the first gear, and the maximum wheel speed requirement of the hub electric drive system in the fourth gear, so as to solve the technical problem that it is difficult to take into account both the maximum wheel speed and the maximum drive torque of the off-road vehicle. The transmission ratio of the middle gear should be relatively uniform to give full play to the power of the hub motor.

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