Heavy-duty 8x8 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 8×8 off-road vehicles. The hub motor includes a hub motor stator and a hub motor rotor, and the planetary gearbox includes components 1-7, planetary gear sets PGS1-PGS3, brake B1, clutch C1, and one-way clutches C2-C3, enabling four forward gears. The transmission ratios of the forward gears are uniform, effectively utilizing the power of the hub motor; the transmission ratio range of the forward gears can reach over 15.0, meeting the requirements of heavy-duty 8×8 off-road vehicles weighing over 35 tons.

Description

Technical Field

[0001] This invention belongs to the field of electric drive technology for new energy vehicles, specifically relating to a four-speed wheel hub electric drive system for a heavy-duty 8×8 off-road vehicle. 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 output from the wheels. Existing in-wheel electric drive systems with in-wheel motors and reducers struggle to simultaneously meet the demands of maximum wheel speed and maximum output torque. This results in excessively large design margins for the in-wheel motors, leading to low system power density. Furthermore, with advancements in in-wheel motor technology, motor speeds are increasing, exacerbating this contradiction. Therefore, it is necessary to develop in-wheel electric drive systems that combine in-wheel motors with transmissions. Heavy-duty 8x8 off-road vehicles weighing over 35 tons place even greater demands on wheel output torque to traverse the most challenging terrains, necessitating a gear ratio range as high as 15.0 for the in-wheel electric drive system. 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 8x8 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 simultaneously achieving 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. Simultaneously, the transmission ratio range should reach 15.0 or higher to allow heavy-duty 8x8 off-road vehicles weighing over 35 tons to overcome resistance on difficult terrain when operating in lower gears.

[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 8×8 off-road vehicles, the four-speed wheel hub electric drive system for heavy-duty 8×8 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 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: brake B1;

[0013] The clutch assembly includes: a first clutch C1, a second one-way clutch C2, and a third one-way clutch C3;

[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 fourth component (4), the third component (3), and the sixth component (6), 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 brake B1 is used to brake the third component (3);

[0020] The first clutch C1 is used to connect the fourth component (4) and the fifth component (5);

[0021] The second one-way clutch C2 is used to connect the third component (3) and the second component (2);

[0022] The third one-way clutch C3 is used to connect the fourth component (4) and the housing.

[0023] When the first clutch C1 and the brake B1 are engaged, the fourth component (4) and the fifth component (5) are connected and rotate as a whole, and the third component (3) brakes to achieve first gear.

[0024] When the third one-way clutch C3 and the brake B1 are engaged, the fourth component (4) is connected to the housing and then brakes, and the third component (3) brakes, thus achieving second gear.

[0025] When the first clutch C1 and the second one-way clutch C2 are engaged, the fourth component (4) and the fifth component (5) rotate as a whole after being connected, and the third component (3) and the second component (2) rotate as a whole after being connected, thus achieving three gears.

[0026] When the second one-way clutch C2 and the third one-way clutch C3 are engaged, the third component (3) and the second component (2) rotate as a whole after being connected, and the fourth component (4) brakes after being connected to the housing, thus achieving four gears.

[0027] The hub motor (①) is a permanent magnet synchronous internal 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 four-speed in-wheel electric drive system for heavy-duty 8×8 off-road vehicles proposed in this invention employs an in-wheel motor paired with a four-speed transmission, comprising 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, brake B1, clutch C1, and one-way clutches C2-C3, enabling four forward gears. The transmission ratios of the four forward gears can be designed with equal ratios, ensuring uniformity and fully utilizing the power and high-efficiency range of the in-wheel motor. The transmission ratio range of the forward gears can reach 15.0, effectively solving the technical problem of simultaneously achieving the highest wheel speed and maximum driving torque in heavy-duty 8×8 off-road vehicles weighing over 35 tons. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the four-speed wheel hub electric drive system for a heavy-duty 8×8 off-road vehicle according to the present invention.

[0031] Among them, ① is the hub motor, ② is the planetary gearbox; 1 to 7 are components, PGS1, PGS2 and PGS3 are planetary gear sets, B1 is the brake, C1 is the clutch, C2 and C3 are one-way clutches; S1, CA1 and R1 are the sun gear, planet carrier and ring gear of the first planetary gear set PGS1, S2, CA2 and R2 are the sun gear, planet carrier and ring gear of the second planetary gear set PGS2, S3, CA3 and R3 are the sun gear, planet carrier and ring gear of the third planetary gear set PGS3; 8 is the hub motor stator, and 9 is the hub motor rotor. Detailed Implementation

[0032] 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.

[0033] To solve the above-mentioned technical problems, the present invention provides a four-speed wheel hub electric drive system for heavy-duty 8×8 off-road vehicles, the four-speed wheel hub electric drive system for heavy-duty 8×8 off-road vehicles includes: a wheel hub motor (①) and a planetary transmission (②);

[0034] The hub motor (①) includes a hub motor stator (8) and a hub motor rotor (9);

[0035] The planetary transmission (②) includes a transmission component assembly, a planetary gear set assembly, a brake assembly, and a clutch assembly;

[0036] 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);

[0037] The planetary array assembly includes: a first planetary array PGS1, a second planetary array PGS2, and a third planetary array PGS3;

[0038] The brake assembly includes: brake B1;

[0039] The clutch assembly includes: a first clutch C1, a second one-way clutch C2, and a third one-way clutch C3;

[0040] The hub motor rotor (9) is connected to the first component (1);

[0041] The hub motor stator (8) is connected to the seventh component (7);

[0042] 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;

[0043] 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 fourth component (4), the third component (3), and the sixth component (6), respectively.

[0044] 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.

[0045] The brake B1 is used to brake the third component (3);

[0046] The first clutch C1 is used to connect the fourth component (4) and the fifth component (5);

[0047] The second one-way clutch C2 is used to connect the third component (3) and the second component (2);

[0048] The third one-way clutch C3 is used to connect the fourth component (4) and the housing.

[0049] When the first clutch C1 and the brake B1 are engaged, the fourth component (4) and the fifth component (5) are connected and rotate as a whole, and the third component (3) brakes to achieve first gear.

[0050] When the third one-way clutch C3 and the brake B1 are engaged, the fourth component (4) is connected to the housing and then brakes, and the third component (3) brakes, thus achieving second gear.

[0051] When the first clutch C1 and the second one-way clutch C2 are engaged, the fourth component (4) and the fifth component (5) rotate as a whole after being connected, and the third component (3) and the second component (2) rotate as a whole after being connected, thus achieving three gears.

[0052] When the second one-way clutch C2 and the third one-way clutch C3 are engaged, the third component (3) and the second component (2) rotate as a whole after being connected, and the fourth component (4) brakes after being connected to the housing, thus achieving four gears.

[0053] The hub motor (①) is a permanent magnet synchronous internal rotor motor.

[0054] Example

[0055] The heavy-duty 8×8 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.

[0056] The hub motor (①) includes a hub motor stator (8) and a hub motor rotor (9), and the planetary gearbox (②) includes components 1 to 7, a first planetary gear set PGS1 to PGS3, a brake B1, a first clutch C1, and a second one-way clutch C2 to C3.

[0057] 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).

[0058] 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 fourth component (4), the third component (3), and the sixth component (6), 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.

[0059] Brake B1 is used to brake the third component (3); first clutch C1 is used to connect the fourth component (4) and the fifth component (5); second one-way clutch C2 is used to connect the third component (3) and the second component (2); third one-way clutch C3 is used to connect the fourth component (4) and the housing.

[0060] When the first clutch C1 and the brake B1 are engaged, the fourth component (4) and the fifth component (5) are connected and rotate as a whole, and the third component (3) brakes to achieve first gear;

[0061] When the third one-way clutch C3 and the brake B1 are engaged, the fourth component (4) is connected to the housing and then brakes, and the third component (3) brakes, thus achieving second gear;

[0062] When the first clutch C1 and the second one-way clutch C2 are engaged, the fourth component (4) and the fifth component (5) are connected and rotate as a whole, and the third component (3) and the second component (2) are connected and rotate as a whole, thus achieving three gears;

[0063] When the second one-way clutch C2 and the third one-way clutch C3 are engaged, the third component (3) and the second component (2) rotate as a whole after being connected, and the fourth component (4) brakes after being connected to the housing, thus achieving four gears.

[0064] like Figure 1 In the embodiment shown, when the k values ​​of the 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.

[0065]

[0066] Note: In the table, “〇” indicates that the control element is engaged, and “×” indicates that the control element is disengaged.

[0067] In this example, the forward gear ratios are all 2.5, achieving an equal ratio design that fully utilizes the power and high-efficiency range of the hub motor. The forward gear ratio range can reach 15.6, meeting the requirements of heavy-duty 8×8 off-road vehicles weighing over 35 tons.

[0068] 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 8×8 off-road vehicle, characterized in that, The heavy-duty 8×8 off-road vehicle's four-speed hub electric drive system includes: a hub motor (①) and a 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 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: brake B1; The clutch assembly includes: a first clutch C1, a second one-way clutch C2, and a third one-way clutch C3; 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 fourth component (4), the third component (3), and the sixth component (6), 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 brake B1 is used to brake the third component (3). The first clutch C1 is used to connect the fourth component (4) and the fifth component (5); The second one-way clutch C2 is used to connect the third component (3) and the second component (2); The third one-way clutch C3 is used to connect the fourth component (4) and the housing.

2. The heavy-duty 8×8 off-road vehicle four-speed wheel hub electric drive system as described in claim 1, characterized in that, When the first clutch C1 and the brake B1 are engaged, the fourth component (4) and the fifth component (5) are connected and rotate as a whole, and the third component (3) brakes, thus achieving first gear.

3. The heavy-duty 8×8 off-road vehicle four-speed wheel hub electric drive system as described in claim 2, characterized in that, When the third one-way clutch C3 and the brake B1 are engaged, the fourth component (4) is connected to the housing and then brakes, and the third component (3) brakes, thus achieving second gear.

4. The heavy-duty 8×8 off-road vehicle four-speed wheel hub electric drive system as described in claim 3, characterized in that, When the first clutch C1 and the second one-way clutch C2 are engaged, the fourth component (4) and the fifth component (5) are connected and rotate as a whole, and the third component (3) and the second component (2) are connected and rotate as a whole, thus achieving three gears.

5. The heavy-duty 8×8 off-road vehicle four-speed wheel hub electric drive system as described in claim 4, characterized in that, When the second one-way clutch C2 and the third one-way clutch C3 are engaged, the third component (3) and the second component (2) rotate as a whole after being connected, and the fourth component (4) brakes after being connected to the housing, thus achieving four gears.

6. The heavy-duty 8×8 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 8×8 off-road vehicle four-speed wheel hub electric drive system as described in claim 6, characterized in that, The system uses a hub motor matched with a transmission drive, enabling four forward gears.

8. The heavy-duty 8×8 off-road vehicle four-speed wheel hub electric drive system as described in claim 6, characterized in that, The transmission ratio range of the system reaches 15.0.

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