Heavy 8*8 off-road vehicle four-gear hub electric driving system

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 a heavy 8 * 8 off-road vehicle. The hub motor comprises a hub motor stator and a hub motor rotor, the planetary transmission comprises components 1-7, planet rows PGS1-PGS3, a brake B1, a clutch C1 and one-way clutches C2-C3, and four forward gears can be achieved. The transmission ratio of the forward gear is uniform, and the power of a hub motor can be effectively utilized; the transmission ratio range of the forward gear can reach 15.0 or above, and the use requirements of heavy 8 * 8 off-road vehicles of 35 tons or above can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive for new energy vehicles, and in particular relates to a four-speed wheel hub electric drive system for a heavy-duty 8×8 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 maximum wheel speed and maximum output torque. This results in excessive design margin of the hub motor, resulting in 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. Heavy-duty 8×8 off-road vehicles above 35 tons have greater requirements for wheel output torque in order to pass the most difficult roads. The transmission ratio range of the hub electric drive system must be as high as 15.0. 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 8×8 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 middle gear should be relatively uniform to give full play to the power of the wheel hub motor. At the same time, the transmission ratio range should reach more than 15.0 to meet the requirements of heavy-duty 8×8 off-road vehicles above 35 tons working in low gear to overcome the resistance of difficult roads.

[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 8×8 off-road vehicle, the four-speed wheel hub electric drive system for a heavy-duty 8×8 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 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 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 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 fourth component (4), the third component (3) and the sixth component (6);

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

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

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

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

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

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

[0025] When the first clutch C1 and the second one-way clutch C2 are engaged, the fourth member (4) and the fifth member (5) are connected and rotate as a whole, and the third member (3) and the second member (2) are connected and rotate as a whole, thereby achieving the third gear.

[0026] When the second one-way clutch C2 and the third one-way clutch C3 are engaged, the third member (3) and the second member (2) are connected and rotate as a whole, and the fourth member (4) and the housing are connected and braked, thereby realizing the fourth gear.

[0027] 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 8×8 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, brake B1, clutch C1 and one-way clutches C2 to C3, which can realize four forward gears. The transmission ratios of the four forward gears can be designed with equal ratios, and the transmission ratios are uniform, which can make full use of the power and high efficiency range of the wheel hub motor. The transmission ratio range of the forward gear can reach 15.0, which can effectively solve the technical problem that it is difficult to take into account the maximum wheel speed and maximum driving torque of heavy-duty 8×8 off-road vehicles above 35 tons. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Among them, ① is the hub motor, ② is the planetary transmission; 1 to 7 are components, PGS1, PGS2 and PGS3 are planetary rows, 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 row PGS1, S2, CA2 and R2 are the sun gear, planet carrier and ring gear of the second planetary row PGS2, S3, CA3 and R3 are the sun gear, planet carrier and ring gear of the third planetary row PGS3; 8 is the stator of the hub motor, 9 is the rotor of the hub motor. DETAILED DESCRIPTION

[0032] 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.

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

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

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

[0036] 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);

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

[0038] The brake assembly comprises: a 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 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);

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

[0044] 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);

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

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

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

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

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

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

[0051] When the first clutch C1 and the second one-way clutch C2 are engaged, the fourth member (4) and the fifth member (5) are connected and rotate as a whole, and the third member (3) and the second member (2) are connected and rotate as a whole, thereby achieving the third gear.

[0052] When the second one-way clutch C2 and the third one-way clutch C3 are engaged, the third member (3) and the second member (2) are connected and rotate as a whole, and the fourth member (4) and the housing are connected and braked, thereby realizing the fourth gear.

[0053] The hub motor (①) adopts a permanent magnet synchronous inner rotor motor.

[0054] Example

[0055] The four-speed wheel hub electric drive system for a heavy-duty 8×8 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.

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

[0057] 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).

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

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

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

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

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

[0063] When the second one-way clutch C2 and the third one-way clutch C3 are engaged, the third member (3) and the second member (2) are connected and rotate as a whole, and the fourth member (4) and the housing are connected and braked, thereby realizing the fourth gear.

[0064] like Figure 1 In the embodiment shown, when the k values ​​of the planetary gears PGS1 to PGS3 are k 1 =-1.073, k 2 =2.50 and k 3 When =1.50, the parameters of the four gears can be obtained and are listed in the following table.

[0065]

[0066] Note: In the table, “0” indicates that the operating parts are combined, and “×” indicates that the operating parts are separated.

[0067] In this example, the transmission ratio of the forward gear is 2.5, which realizes the equal ratio design and can make full use of the power and high efficiency range of the wheel hub motor. The transmission ratio range of the forward gear can reach 15.6, which can meet the use requirements of heavy-duty 8×8 off-road vehicles over 35 tons.

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

2. The four-speed wheel hub electric drive system for a heavy-duty 8×8 off-road vehicle as claimed in claim 1, characterized in that: When the first clutch C1 and the brake B1 are engaged, the fourth member (4) and the fifth member (5) are connected and rotate as a whole, and the third member (3) is braked to achieve the first gear.

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

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

5. The four-speed wheel hub electric drive system for a heavy-duty 8×8 off-road vehicle as claimed in claim 4, characterized in that: When the second one-way clutch C2 and the third one-way clutch C3 are engaged, the third member (3) and the second member (2) are connected and rotate as a whole, and the fourth member (4) and the housing are connected and braked, thereby realizing the fourth gear.

6. The four-speed wheel hub electric drive system for a heavy-duty 8×8 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 8×8 off-road vehicle as claimed in claim 6, characterized in that: The system adopts a wheel hub motor matched with a transmission drive form, and can achieve four forward gears.

8. The four-speed wheel hub electric drive system for a heavy-duty 8×8 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.

9. The four-speed wheel hub electric drive system for a heavy-duty 8×8 off-road vehicle as claimed in claim 6, characterized in that: The transmission ratio range of the system should reach above 15.0 to meet the requirements of heavy 8×8 off-road vehicles over 35 tons working in low gear to overcome the resistance of difficult roads.

10. The four-speed wheel hub electric drive system for a heavy-duty 8×8 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.

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