Heavy-duty 4x4 off-road vehicle four-speed wheel hub electric drive system

Abstract

This invention belongs to the field of electric drive technology for new energy vehicles, specifically relating to a four-speed hub electric drive system for heavy-duty 4×4 off-road vehicles, including a hub motor and a planetary gearbox. The hub motor includes a hub motor stator and a hub motor rotor. The planetary gearbox includes components 1-7, planetary gear sets PGS1-PGS3, brakes B1-B2, and one-way clutches C1-C2, enabling four forward gears. The transmission ratios of the forward gears are relatively uniform, effectively utilizing the power and high-efficiency range of the hub motor, and meeting the requirements of a 10-ton heavy-duty 4×4 off-road vehicle.

Description

Technical Field

[0001] This invention belongs to the field of electric drive technology for new energy vehicles, and specifically relates to a four-speed wheel hub electric drive system for heavy-duty 4×4 off-road vehicles. Background Technology

[0002] In-wheel electric drive systems place the powertrain inside the vehicle's wheel rim, representing a distributed drive system. Currently, in-wheel electric drive systems mainly employ three forms: in-wheel motor direct drive, in-wheel motor paired with a reducer, and in-wheel motor paired with a transmission. Off-road vehicles primarily use the in-wheel motor paired with a reducer form.

[0003] Off-road vehicles operate under complex conditions, requiring higher driving torque from the wheels. Existing in-wheel electric drive systems with in-wheel motors and reducers struggle to balance the demands of maximum wheel speed and maximum output torque, resulting in excessive design margins for the in-wheel motors and low system power density. As in-wheel motor technology advances, their rotational speeds increase, exacerbating this contradiction. Therefore, it is necessary to develop an in-wheel electric drive system with an in-wheel motor and transmission. For a 10-ton heavy-duty 4x4 off-road vehicle, to more effectively utilize the power and high-efficiency range of the in-wheel motor, the gear ratios of the forward gears must be relatively uniform. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The technical problem this invention aims to solve is: how to provide a four-speed hub electric drive system for heavy-duty 4×4 off-road vehicles, employing a hub motor matched with a transmission to achieve four forward gears. First gear meets the maximum output torque requirement of the hub electric drive system, while fourth gear meets the maximum wheel speed requirement, thus solving the technical problem of balancing maximum wheel speed and maximum drive torque in off-road vehicles. The transmission ratios of the intermediate gears should be relatively uniform to fully utilize the power of the hub motor.

[0006] (II) Technical Solution

[0007] To solve the above-mentioned technical problems, the present invention provides a four-speed wheel hub electric drive system for heavy-duty 4×4 off-road vehicles, the four-speed wheel hub electric drive system for heavy-duty 4×4 off-road vehicles includes: a wheel hub motor (①) and a planetary transmission (②);

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

[0009] The planetary transmission (②) includes a transmission component assembly, a planetary gear set assembly, a brake assembly, and a one-way clutch assembly.

[0010] The transmission component assembly includes: 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 array assembly includes: a first planetary array PGS1, a second planetary array PGS2, and a third planetary array PGS3;

[0012] The brake assembly includes: 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 set PGS1 includes a first sun gear S1, a first planet carrier CA1 and a first gear ring R1, which are connected to the seventh component (7), the first component (1) and the fifth component (5) respectively;

[0017] The second planetary gear set PGS2 includes a second sun gear S2, a second planet carrier CA2, and a second gear ring R2, which are connected to the third component (3), the sixth component (6), and the fourth component (4), respectively.

[0018] The third planetary gear set PGS3 includes a third sun gear S3, a third planet carrier CA3, and a third gear ring R3, which are connected to the fifth component (5), the second component (2), and the sixth component (6), respectively.

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

[0020] The second brake B2 is used to brake the fourth component (4);

[0021] The first one-way clutch C1 is used to connect the third component (3) and the fifth component (5);

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

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

[0024] When the first one-way clutch C1 and the second brake B2 are engaged, the third component (3) and the fifth component (5) are connected and rotate as a whole, and the fourth component (4) brakes, thus achieving second gear.

[0025] When the second one-way clutch C2 and the first brake B1 are engaged, the fourth component (4) and the second component (2) are connected and rotate as a whole, and the third component (3) brakes, thus achieving three gears.

[0026] When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the third component (3) and the fifth component (5) rotate as a whole after being connected, and the fourth component (4) and the second component (2) rotate as a whole after being connected, thus achieving four gears.

[0027] The hub motor (①) is a permanent magnet synchronous inner rotor motor.

[0028] (III) Beneficial Effects

[0029] Compared to existing in-wheel electric drive systems for off-road vehicles that use in-wheel motors paired with reducers, the heavy-duty 4×4 off-road vehicle four-speed in-wheel electric drive system proposed in this invention employs an in-wheel motor paired with a four-speed transmission, including an in-wheel motor and a planetary transmission. The in-wheel motor includes an in-wheel motor stator and an in-wheel motor rotor. The planetary transmission includes components 1-7, planetary gear sets PGS1-PGS3, brakes B1-B2, and one-way clutches C1-C2, enabling four forward gears. The transmission ratios of the four forward gears can be designed to be relatively uniform, fully utilizing the power and high-efficiency range of the in-wheel motor, effectively solving the technical problem of simultaneously achieving the highest wheel speed and maximum driving torque in a 10-ton heavy-duty 4×4 off-road vehicle. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the four-speed wheel hub electric drive system for heavy-duty 4×4 off-road vehicles according to the present invention.

[0031] Among them, ① is the hub motor, and ② is the planetary gearbox;

[0032] 1~7——First component, second component, third component, fourth component, fifth component, sixth component, seventh component;

[0033] PGS1, PGS2, and PGS3 – First Planetary Sorting, Second Planetary Sorting, and Third Planetary Sorting;

[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 gear ring of the first planetary gear set PGS1; S2, CA2, R2 – the second sun gear, the second planet carrier, and the second gear ring of the second planetary gear set PGS2; S3, CA3, R3 – the third sun gear, the third planet carrier, and the third gear ring of the third planetary gear set PGS3.

[0037] 8 – Stator of hub motor; 9 – Rotor of hub motor. Detailed Implementation

[0038] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0039] To solve the above-mentioned technical problems, the present invention provides a four-speed wheel hub electric drive system for heavy-duty 4×4 off-road vehicles, the four-speed wheel hub electric drive system for heavy-duty 4×4 off-road vehicles includes: a wheel hub motor (①) and a planetary transmission (②);

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

[0041] The planetary transmission (②) includes a transmission component assembly, a planetary gear set assembly, a brake assembly, and a one-way clutch assembly.

[0042] The transmission component assembly includes: 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 array assembly includes: a first planetary array PGS1, a second planetary array PGS2, and a third planetary array PGS3;

[0044] The brake assembly includes: 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 set PGS1 includes a first sun gear S1, a first planet carrier CA1 and a first gear ring R1, which are connected to the seventh component (7), the first component (1) and the fifth component (5) respectively;

[0049] The second planetary gear set PGS2 includes a second sun gear S2, a second planet carrier CA2, and a second gear ring R2, which are connected to the third component (3), the sixth component (6), and the fourth component (4), respectively.

[0050] The third planetary gear set PGS3 includes a third sun gear S3, a third planet carrier CA3, and a third gear ring R3, which are connected to the fifth component (5), the second component (2), and the sixth component (6), respectively.

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

[0052] The second brake B2 is used to brake the fourth component (4);

[0053] The first one-way clutch C1 is used to connect the fourth component (4) and the second component (2);

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

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

[0056] When the first one-way clutch C1 and the second brake B2 are engaged, the third component (3) and the fifth component (5) are connected and rotate as a whole, and the fourth component (4) brakes, thus achieving second gear.

[0057] When the second one-way clutch C2 and the first brake B1 are engaged, the fourth component (4) and the second component (2) are connected and rotate as a whole, and the third component (3) brakes, thus achieving three gears.

[0058] When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the third component (3) and the fifth component (5) rotate as a whole after being connected, and the fourth component (4) and the second component (2) rotate as a whole after being connected, thus achieving four gears.

[0059] The hub motor (①) is a permanent magnet synchronous inner rotor motor.

[0060] Example 1

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

[0062] The hub motor (①) includes a hub motor stator (8) and a hub motor rotor (9), and the planetary gearbox (②) includes a first component (1) to a seventh component (7), a first planetary gearbox PGS1 to a third planetary gearbox 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 hub motor (①) can be a permanent magnet synchronous internal rotor motor. The hub motor rotor (9) is connected to the first component (1), and the hub motor stator (8) is connected to the seventh component (7).

[0064] The first planetary gear set PGS1 includes a sun gear S1, a planet carrier CA1, and a ring gear R1, which are connected to the seventh component (7), the first component (1), and the fifth component (5), respectively. The second planetary gear set PGS2 includes a sun gear S2, a planet carrier CA2, and a ring gear R2, which are connected to the third component (3), the sixth component (6), and the fourth component (4), respectively. The third planetary gear set PGS3 includes a sun gear S3, a planet carrier CA3, and a ring gear R3, which are connected to the fifth component (5), the second component (2), and the sixth component (6), respectively.

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

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

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

[0068] When the first one-way clutch C1 and the second brake B2 are engaged, the third component (3) and the fifth component (5) are connected and rotate as a whole, and the fourth component (4) brakes, thus achieving second gear;

[0069] When the second one-way clutch C2 and the first brake B1 are engaged, the fourth component (4) and the second component (2) are connected and rotate as a whole, and the third component (3) brakes, thus achieving three gears;

[0070] When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the third component (3) and the fifth component (5) rotate as a whole after being connected, and the fourth component (4) and the second component (2) rotate as a whole after being connected, thus achieving four gears.

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

[0072]

[0073]

[0074] Note: In the table, “〇” indicates that the control element is engaged, and “×” indicates that the control element is disengaged.

[0075] In this example, the transmission ratio between forward gears is 1.23 to 1.43, which achieves a relatively uniform ratio design and can make full use of the power and high efficiency range of the hub motor. By improving the k-value design of the second planetary gear set PGS2 and PGS3, a more uniform transmission ratio can be obtained.

[0076] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention and without changing the connection relationship, such as changing the arrangement position of the planetary gear set and the one-way clutch, or modifying the first planetary gear set into a simple double-planet gear set. These improvements and modifications should also be considered within 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 heavy-duty 4×4 off-road vehicle four-speed hub electric drive system includes: hub motor (①) and planetary transmission (②); The hub motor (①) includes a hub motor stator (8) and a hub motor rotor (9). The planetary transmission (②) includes a transmission component assembly, a planetary gear set assembly, a brake assembly, and a one-way clutch assembly; The transmission component assembly includes: 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 array assembly includes: a first planetary array PGS1, a second planetary array PGS2, and a third planetary array PGS3; The brake assembly includes: 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 set PGS1 includes a first sun gear S1, a first planet carrier CA1 and a first gear ring R1, which are connected to the seventh component (7), the first component (1) and the fifth component (5) respectively; The second planetary gear set PGS2 includes a second sun gear S2, a second planet carrier CA2, and a second gear ring R2, which are connected to the third component (3), the sixth component (6), and the fourth component (4), respectively. The third planetary gear set PGS3 includes a third sun gear S3, a third planet carrier CA3, and a third gear ring R3, which are connected to the fifth component (5), the second component (2), and the sixth component (6), respectively. The first brake B1 is used to brake the third component (3); The second brake B2 is used to brake the fourth component (4); The first one-way clutch C1 is used to connect the fourth component (4) and the second component (2); The second one-way clutch C2 is used to connect the third component (3) and the fifth component (5).

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

3. The heavy-duty 4×4 off-road vehicle four-speed hub electric drive system as described in claim 2, characterized in that, When the first one-way clutch C1 and the second brake B2 are engaged, the third component (3) and the fifth component (5) are connected and rotate as a whole, and the fourth component (4) brakes, thus achieving second gear.

4. The heavy-duty 4×4 off-road vehicle four-speed wheel hub electric drive system as described in claim 3, characterized in that, When the second one-way clutch C2 and the first brake B1 are engaged, the fourth component (4) and the second component (2) rotate as a whole after being connected, and the third component (3) brakes, thus achieving three gears.

5. The heavy-duty 4×4 off-road vehicle four-speed wheel hub electric drive system as described in claim 4, characterized in that, When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the third component (3) and the fifth component (5) are connected and rotate as a whole, and the fourth component (4) and the second component (2) are connected and rotate as a whole, thus achieving four gears.

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

7. The heavy-duty 4×4 off-road vehicle four-speed wheel hub electric drive system as described in claim 6, characterized in that, The system enables four forward gears.

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