Heavy 6*6 off-road vehicle four-gear hub electric driving system

Abstract

The invention belongs to the technical field of new energy vehicle electric drive, and particularly relates to a heavy 6 * 6 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. By means of the one-way clutch, the size and weight of the system can be reduced to achieve light weight, the planet rows PGS2 and PGS3 can adopt the equal k value structural design to simplify the variety of gears so as to improve the economical efficiency of the system, the transmission ratio range of the four forward gears is wider than 6.0, and the use requirements of 20-ton heavy 6 * 6 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 6×6 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 a 20-ton heavy-duty 6×6 off-road vehicle, the forward gear ratio ratio range is required to reach 6.0 or above. 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 a heavy-duty 6×6 off-road vehicle, 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. At the same time, the transmission ratio range of the forward gear is required to be as wide as 6.0 or more.

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

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

[0022] The second one-way clutch C2 is used to connect the second member (2) and the sixth member (6).

[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 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 second gear.

[0025] When the second one-way clutch C2 and the second brake B2 are combined, the second member (2) and the sixth member (6) are connected and rotate as a whole, and the fourth member (4) 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 fourth member (4) and the second member (2) are connected and rotate as a whole, and the second member (2) and the sixth member (6) 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 6×6 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, the first planetary gear PGS1 to PGS3, brakes B1 to B2 and one-way clutches C1 to C2, which can achieve four forward gears. The use of a one-way clutch can reduce the volume and weight of the system to achieve lightweight, and the transmission ratio range of the four forward gears can reach more than 6.0, which 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 20-ton heavy-duty 6×6 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 6×6 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 6×6 off-road vehicle, the four-speed wheel hub electric drive system for a heavy-duty 6×6 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 fifth component (5), 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 sixth component (6), the second component (2) and the third component (3);

[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 second member (2) and the sixth member (6).

[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 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 second gear.

[0057] When the second one-way clutch C2 and the second brake B2 are combined, the second member (2) and the sixth member (6) are connected and rotate as a whole, and the fourth member (4) 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 fourth member (4) and the second member (2) are connected and rotate as a whole, and the second member (2) and the sixth member (6) 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] Example

[0061] The four-speed wheel hub electric drive system for a heavy-duty 6×6 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 wheel hub motor (①) comprises a wheel hub motor stator (8) and a wheel hub motor rotor (9), and the planetary transmission (②) comprises components 1-7, planetary gears PGS1-PGS3, brakes B1-B2, and one-way clutches C1-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 includes a first sun gear S1, a first planetary 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 includes a second sun gear S2, a second planetary carrier CA2 and a second ring gear R2, which are respectively connected to the fifth component (5), the sixth component (6) and the fourth component (4); the third planetary gear PGS3 includes a third sun gear S3, a third planetary carrier CA3 and a third ring gear R3, which are respectively connected to the sixth component (6), the second component (2) and the third component (3).

[0065] The first brake B1 is used to brake the third member (3), and the second brake B2 is used to brake the fourth member (4); 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 second member (2) and the sixth member (6).

[0066] 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;

[0067] When the first one-way clutch C1 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 second gear;

[0068] When the second one-way clutch C2 and the second brake B2 are combined, the second member (2) and the sixth member (6) are connected and rotate as a whole, and the fourth member (4) is braked to achieve the third gear;

[0069] When the first one-way clutch C1 and the second one-way clutch C2 are engaged, the fourth member (4) and the second member (2) are connected and rotate as a whole, and the second member (2) and the sixth member (6) are connected and rotate as a whole, thereby realizing the fourth gear.

[0070] like Figure 1 In the illustrated embodiment, when the k values ​​of the first planetary gears PGS1 to PGS3 are k1 = -1.073, k2 = 1.50 and k3 = 1.50 respectively, parameters of 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 design 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 6.25, which can meet the use requirements of 20-ton heavy-duty 6×6 off-road vehicles.

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

2. The four-speed wheel hub electric drive system for a heavy-duty 6×6 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 6×6 off-road vehicle as claimed in claim 2, characterized in that: When the first one-way clutch C1 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 second gear.

4. The four-speed wheel hub electric drive system for a heavy-duty 6×6 off-road vehicle as claimed in claim 3, characterized in that: When the second one-way clutch C2 and the second brake B2 are engaged, the second member (2) and the sixth member (6) are connected and rotate as a whole, and the fourth member (4) is braked to achieve the third gear.

5. The four-speed wheel hub electric drive system for a heavy-duty 6×6 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 fourth member (4) and the second member (2) are connected and rotate as a whole, and the second member (2) and the sixth member (6) 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 6×6 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 6×6 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 6×6 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 first gear, and can meet the maximum wheel speed requirement of the hub electric drive system in 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 driving torque of off-road vehicles.

9. The four-speed wheel hub electric drive system for a heavy-duty 6×6 off-road vehicle as claimed in claim 6, characterized in that: The system requires a wide forward gear ratio range of more than 6.

0.

10. The four-speed wheel hub electric drive system for a heavy-duty 6×6 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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