Heavy truck electric driving system

Abstract

An electric driving system of a heavy truck relates to the technical field of heavy-duty automobile parts, can realize high-speed-ratio transmission, and is more harmonious and reliable on the whole. In the heavy truck electric driving system, a motor is connected with a front box input gear, and the front box input gear is meshed with a front box middle driven gear; the front box middle driving gear is meshed with the front box output gear; the front box middle driven gear and the front box middle driving gear are fixed on the front box middle shaft; the front box output gear is connected with a rear box normally-meshed driving gear, and the rear box normally-meshed driving gear is meshed with a first intermediate shaft normally-meshed driven gear and a second intermediate shaft normally-meshed driven gear; the third-gear driven gear is meshed with the first intermediate shaft third-gear gear and the second intermediate shaft third-gear gear; the second-gear driven gear is meshed with the first intermediate shaft second-gear gear and the second intermediate shaft second-gear gear; and the first-gear driven gear is meshed with the first-gear gear of the first intermediate shaft and the first-gear gear of the second intermediate shaft.

Description

Technical Field

[0001] This utility model relates to the field of heavy-duty vehicle parts technology, and in particular to a heavy-duty truck electric drive system. Background Technology

[0002] Currently, in the context of energy conservation, emission reduction, and electrification, the use of transmissions as a key component assembly in automobiles is narrowing. However, they still play an irreplaceable role in the field of heavy-duty commercial vehicles such as dump trucks.

[0003] The existing power sources for electric heavy trucks on the market are all high-torque, low-speed drive motors, which are large in size and expensive. With the technological breakthrough of permanent magnet synchronous motors, the motors are becoming smaller and smaller, and their speeds are becoming higher and higher.

[0004] In the prior art, there is an electric gearbox with a dual intermediate shaft structure. The input shaft and the output shaft are arranged coaxially, and the dual intermediate shafts are respectively arranged on both sides of the output shaft. The shift actuator and the shift driven gear are both arranged on the output shaft. The shift driving gears on both sides of the output shaft are symmetrically arranged on the intermediate shafts, and the power is combined to the output shaft.

[0005] However, the inventors of this application have discovered that each gear in a multi-speed gearbox is essentially a two-stage gear transmission with a small transmission ratio, which still cannot meet the requirements of low torque and high speed input of the motor. Utility Model Content

[0006] The purpose of this utility model is to provide a heavy-duty truck electric drive system, in which each gear of the gearbox adopts a four-stage gear transmission, thereby achieving a high speed ratio transmission and meeting the matching requirements of a high-speed motor; furthermore, the power input and output of the gearbox are coaxial, making the whole system more coordinated and reliable.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A heavy-duty truck electric drive system includes: a motor, the motor being fixedly connected to a front box input gear, and the front box input gear meshing with a front box intermediate driven gear; a front box intermediate driving gear meshing with a front box output gear, and both the front box intermediate driven gear and the front box intermediate driving gear being fixed to a front box intermediate shaft; the front box output gear being fixedly connected to a rear box constantly meshed driving gear, and the rear box constantly meshed driving gear simultaneously meshing with a first intermediate shaft constantly meshed driven gear and a second intermediate shaft constantly meshed driven gear; a third-speed driven gear simultaneously meshing with a first intermediate shaft third-speed gear and a second intermediate shaft third-speed gear; and a second-speed driven gear simultaneously meshing with a first intermediate shaft second-speed gear. The second intermediate shaft has two gears meshing with each other; the first gear driven gear simultaneously meshes with the first gear of the first intermediate shaft and the first gear of the second intermediate shaft; the first intermediate shaft's constant-mesh driven gear, the first intermediate shaft's third gear, the first intermediate shaft's second gear, and the first intermediate shaft's first gear are all fixed on the first intermediate shaft; the second intermediate shaft's constant-mesh driven gear, the second intermediate shaft's third gear, the second intermediate shaft's second gear, and the second intermediate shaft's first gear are all fixed on the second intermediate shaft; the third gear, the second gear, and the first gear driven gear are all loosely fitted on the output shaft; the third and fourth gear sleeves and the first and second gear sleeves are all fixed on the output shaft.

[0009] When the first and second gear sleeves are engaged with the first gear driven gear, the power is transmitted from the motor to the front gearbox input gear, and then to the front gearbox output gear through the front gearbox intermediate driven gear and the front gearbox intermediate driving gear; the power is then transmitted to the output shaft through the first intermediate shaft, the second intermediate shaft, and the first intermediate shaft constant mesh driven gear, the second intermediate shaft constant mesh driven gear, the first intermediate shaft first gear, and the second intermediate shaft first gear to the output shaft.

[0010] Specifically, when the first and second gear sleeves are engaged with the second gear driven gear, power is transmitted from the motor to the front gearbox input gear, and then transmitted to the front gearbox output gear through the front gearbox intermediate driven gear and the front gearbox intermediate driving gear; the power is then transmitted to the output shaft through the first intermediate shaft, the second intermediate shaft, and the first intermediate shaft constant mesh driven gear, the second intermediate shaft constant mesh driven gear, the first intermediate shaft second gear, and the second intermediate shaft second gear.

[0011] Furthermore, when the third and fourth gear sleeves are engaged with the third driven gear, the power is transmitted from the motor to the front gearbox input gear, and then transmitted to the front gearbox output gear through the front gearbox intermediate driven gear and the front gearbox intermediate driving gear; the power is then transmitted to the output shaft through the first intermediate shaft, the second intermediate shaft, and the first intermediate shaft constant mesh driven gear, the second intermediate shaft constant mesh driven gear, the first intermediate shaft third gear, and the second intermediate shaft third gear.

[0012] Furthermore, when the third and fourth gear sleeves are engaged with the constant mesh drive gear of the rear housing, the power is transmitted from the motor to the input gear of the front housing, and then transmitted to the output gear of the front housing through the intermediate driven gear and the intermediate drive gear of the front housing; the power is then transmitted to the output shaft through the constant mesh drive gear of the rear housing.

[0013] Compared with existing technologies, the heavy-duty truck electric drive system of this utility model has the following advantages:

[0014] In the heavy-duty truck electric drive system provided by this utility model, the motor is fixedly connected to the front box input gear, and the front box input gear meshes with the front box intermediate driven gear; the front box intermediate driving gear meshes with the front box output gear, and both the front box intermediate driven gear and the front box intermediate driving gear are fixed to the front box intermediate shaft; the front box output gear is fixedly connected to the rear box constant-mesh driving gear, and the rear box constant-mesh driving gear simultaneously meshes with the first intermediate shaft constant-mesh driven gear and the second intermediate shaft constant-mesh driven gear; the third-speed driven gear simultaneously meshes with the first intermediate shaft third-speed gear and the second intermediate shaft third-speed gear; the second-speed driven gear simultaneously meshes with the first intermediate shaft second-speed gear and the second intermediate shaft second-speed gear; the first-speed driven gear simultaneously meshes with the first intermediate shaft first-speed gear and the second intermediate shaft first-speed gear. The gears mesh with each other; the first intermediate shaft's constant-mesh driven gear, the first intermediate shaft's third gear, the first intermediate shaft's second gear, and the first intermediate shaft's first gear are all fixed on the first intermediate shaft; the second intermediate shaft's constant-mesh driven gear, the second intermediate shaft's third gear, the second intermediate shaft's second gear, and the second intermediate shaft's first gear are all fixed on the second intermediate shaft; the third, second, and first gear driven gears are all loosely fitted on the output shaft; the third and fourth gear sleeves and the first and second gear sleeves are all fixed on the output shaft; therefore, the heavy-duty truck electric drive system provided by this utility model has strong torque capability in first gear, a simple and reliable fourth-gear structure, and adopts an integrated intermediate shaft and press-fitting process, thus having the advantage of high concentricity; at the same time, the gear shifting mechanism uses toothed splines for the engagement teeth, thus reducing shifting impact. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of the heavy-duty truck electric drive system provided in this embodiment of the utility model;

[0016] Figure 2 A schematic diagram of the first gear power transmission path in the heavy truck electric drive system provided in this embodiment of the utility model;

[0017] Figure 3 A schematic diagram of the second-gear power transmission path in the heavy-duty truck electric drive system provided in this embodiment of the utility model;

[0018] Figure 4 A schematic diagram of the three-speed power transmission path in the heavy-duty truck electric drive system provided in this embodiment of the utility model;

[0019] Figure 5 A schematic diagram of the four-speed power transmission path in the heavy-duty truck electric drive system provided in this embodiment of the utility model.

[0020] Figure label:

[0021] 1-Motor; 2-Gearbox front housing; 3-Gearbox rear housing; 4-Front housing input gear; 5-Front housing output gear; 6-Front housing intermediate driven gear; 7-Front housing intermediate shaft; 8-Front housing intermediate drive gear; 9-Rear housing constant mesh drive gear; 10-First intermediate shaft constant mesh driven gear; 11-First intermediate shaft third gear; 12-First intermediate shaft second gear; 13-First intermediate shaft first gear; 14-First intermediate shaft; 15-Second intermediate shaft constant mesh driven gear; 16-Second intermediate shaft third gear; 17-Second intermediate shaft second gear; 18-Second intermediate shaft first gear; 19-Second intermediate shaft; 20-Third and fourth gear sleeves; 21-Third gear driven gear; 22-Second gear driven gear; 23-First and second gear sleeves; 24-First gear driven gear; 25-Output shaft. Detailed Implementation

[0022] For ease of understanding, the heavy-duty truck electric drive system provided in the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] This utility model embodiment provides a heavy-duty truck electric drive system, such as Figure 1As shown, it includes: a motor 1, which is fixedly connected to the front gearbox input gear 4, and the front gearbox input gear 4 meshes with the front gearbox intermediate driven gear 6; the front gearbox intermediate driving gear 8 meshes with the front gearbox output gear 5, and both the front gearbox intermediate driven gear 6 and the front gearbox intermediate driving gear 8 are fixed to the front gearbox intermediate shaft 7; the front gearbox output gear 5 is fixedly connected to the rear gearbox constant-mesh driving gear 9, and the rear gearbox constant-mesh driving gear 9 simultaneously meshes with the first intermediate shaft constant-mesh driven gear 10 and the second intermediate shaft constant-mesh driven gear 15; the third-speed driven gear 21 simultaneously meshes with the first intermediate shaft third-speed gear 11 and the second intermediate shaft third-speed gear 16; the second-speed driven gear 22 simultaneously meshes with the first intermediate shaft second-speed gear 12 and the second intermediate shaft... The second gear 17 meshes with the first gear driven gear 24, which simultaneously meshes with the first gear 13 on the first intermediate shaft and the first gear 18 on the second intermediate shaft. The first intermediate shaft constant-mesh driven gear 10, the first intermediate shaft third gear 11, the first intermediate shaft second gear 12, and the first intermediate shaft first gear 13 are all fixed on the first intermediate shaft 14. The second intermediate shaft constant-mesh driven gear 15, the second intermediate shaft third gear 16, the second intermediate shaft second gear 17, and the second intermediate shaft first gear 18 are all fixed on the second intermediate shaft 19. The third gear driven gear 21, the second gear driven gear 22, and the first gear driven gear 24 are all loosely fitted on the output shaft 25. The third and fourth gear sleeves 20 and the first and second gear sleeves 23 are all fixed on the output shaft 25.

[0024] Compared with the prior art, the heavy-duty truck electric drive system described in this embodiment of the invention has the following advantages:

[0025] In the heavy-duty truck electric drive system provided in this embodiment of the utility model, the motor 1 is fixedly connected to the front box input gear 4, and the front box input gear 4 meshes with the front box intermediate driven gear 6; the front box intermediate driving gear 8 meshes with the front box output gear 5, and both the front box intermediate driven gear 6 and the front box intermediate driving gear 8 are fixed to the front box intermediate shaft 7; the front box output gear 5 is fixedly connected to the rear box constant-mesh driving gear 9, and the rear box constant-mesh driving gear 9 simultaneously meshes with the first intermediate shaft constant-mesh driven gear 10 and the second intermediate shaft constant-mesh driven gear 15; the third-speed driven gear 21 simultaneously meshes with the first intermediate shaft third-speed gear 11 and the second intermediate shaft third-speed gear 16; the second-speed driven gear 22 simultaneously meshes with the first intermediate shaft second-speed gear 12 and the second intermediate shaft second-speed gear 17; and the first-speed driven gear 24 simultaneously meshes with the first intermediate shaft first-speed gear 13 and the second intermediate shaft first-speed gear 14. The gears 18 mesh with each other; the first intermediate shaft's constant mesh driven gear 10, the first intermediate shaft's third gear 11, the first intermediate shaft's second gear 12, and the first intermediate shaft's first gear 13 are all fixed on the first intermediate shaft 14; the second intermediate shaft's constant mesh driven gear 15, the second intermediate shaft's third gear 16, the second intermediate shaft's second gear 17, and the second intermediate shaft's first gear 18 are all fixed on the second intermediate shaft 19; the third gear driven gear 21, the second gear driven gear 22, and the first gear driven gear 24 are all loosely fitted on the output shaft 25; the third and fourth gear sleeves 20 and the first and second gear sleeves 23 are all fixed on the output shaft 25; therefore, the heavy truck electric drive system provided by this utility model embodiment has strong torque capability in first gear, simple and reliable structure in fourth gear, and adopts an integrated intermediate shaft and press-fitting process, thus having the advantage of high concentricity; at the same time, the gear shifting mechanism uses toothed splines, thus reducing shifting impact.

[0026] Among them, such as Figure 2 As shown, when the first and second gear sleeves 23 are engaged with the first gear driven gear 24, the power is transmitted from the motor 1 to the front gearbox input gear 4, and then to the front gearbox output gear 5 through the front gearbox intermediate driven gear 6 and the front gearbox intermediate driving gear 8. The power is then transmitted to the output shaft 25 through the first intermediate shaft 14, the second intermediate shaft 19, and the first intermediate shaft constant mesh driven gear 10, the second intermediate shaft constant mesh driven gear 15, the first intermediate shaft first gear 13, and the second intermediate shaft first gear 18, thereby achieving good first gear power transmission.

[0027] Specifically, such as Figure 3As shown, when the first and second gear sleeves 23 are combined with the second gear driven gear 22, the power is transmitted from the motor 1 to the front gearbox input gear 4, and then to the front gearbox output gear 5 through the front gearbox intermediate driven gear 6 and the front gearbox intermediate driving gear 8. The power is then transmitted to the output shaft 25 through the first intermediate shaft 14, the second intermediate shaft 19, and the first intermediate shaft constant mesh driven gear 10, the second intermediate shaft constant mesh driven gear 15, the first intermediate shaft second gear 12, and the second intermediate shaft second gear 17, thereby achieving good second gear power transmission.

[0028] Furthermore, such as Figure 4 As shown, when the third and fourth gear sleeves 20 are combined with the third gear driven gear 21, the power is transmitted from the motor 1 to the front gearbox input gear 4, and then to the front gearbox output gear 5 through the front gearbox intermediate driven gear 6 and the front gearbox intermediate driving gear 8. The power is then transmitted to the output shaft 25 through the first intermediate shaft 14, the second intermediate shaft 19, and the first intermediate shaft constant mesh driven gear 10, the second intermediate shaft constant mesh driven gear 15, the first intermediate shaft third gear 11, and the second intermediate shaft third gear 16, thereby achieving good three-speed power transmission.

[0029] Furthermore, such as Figure 5 As shown, when the third and fourth gear sleeves 20 are engaged with the constant mesh drive gear 9 of the rear box, the power is transmitted from the motor 1 to the input gear 4 of the front box, and then transmitted to the output gear 5 of the front box through the intermediate driven gear 6 and the intermediate drive gear 8 of the front box; the power is then transmitted to the output shaft 25 through the constant mesh drive gear 9 of the rear box, thus achieving good four-speed power transmission.

[0030] In summary, the heavy-duty truck electric drive system provided by this utility model embodiment has the following main advantages:

[0031] (1) First gear, second gear and third gear all adopt four-stage gear transmission, which can achieve a large speed ratio;

[0032] (2) The front housing adopts a parallel shaft two-stage gear transmission, which is simple and reliable.

[0033] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A heavy truck electric drive system, characterized in that, The utility model provides a kind of transmission mechanism of three-speed motorcycle, including: Motor, the motor is fixedly connected with front box input gear, and the front box input gear is engaged with front box intermediate driven gear;Front box intermediate driving gear is engaged with front box output gear, and the front box intermediate driven gear is fixed to front box intermediate shaft with the front box intermediate driving gear;The front box output gear is fixedly connected with rear box constant engagement driving gear, and the rear box constant engagement driving gear is engaged with first intermediate shaft constant engagement driven gear, second intermediate shaft constant engagement driven gear simultaneously;Three gear driven gear is engaged with first intermediate shaft three gear, second intermediate shaft three gear simultaneously;Two gear driven gear is engaged with first intermediate shaft two gear, second intermediate shaft two gear simultaneously;One gear driven gear is engaged with first intermediate shaft one gear, second intermediate shaft one gear simultaneously;First intermediate shaft constant engagement driven gear, the first intermediate shaft three gear, the first intermediate shaft two gear, the first intermediate shaft one gear are fixed on first intermediate shaft;Second intermediate shaft constant engagement driven gear, the second intermediate shaft three gear, the second intermediate shaft two gear, the second intermediate shaft one gear are fixed on second intermediate shaft;Three gear driven gear, two gear driven gear, one gear driven gear are all sleeved on output shaft;Three four gear tooth sleeve and one two gear tooth sleeve are fixed on the output shaft.

2. The heavy-duty truck electric drive system of claim 1, wherein, When one two gear tooth sleeve is combined with two gear driven gear, power is transmitted from the motor to the front box input gear, and power is transmitted to the front box output gear through the front box intermediate driven gear and the front box intermediate driving gear;Power is transmitted to the output shaft through the first intermediate shaft, the second intermediate shaft, and the first intermediate shaft constant engagement driven gear, the second intermediate shaft constant engagement driven gear and the first intermediate shaft two gear, the second intermediate shaft two gear above.

3. The heavy-duty truck electric drive system of claim 1, wherein, When three four gear tooth sleeve is combined with three gear driven gear, power is transmitted from the motor to the front box input gear, and power is transmitted to the front box output gear through the front box intermediate driven gear and the front box intermediate driving gear;Power is transmitted to the output shaft through the first intermediate shaft, the second intermediate shaft, and the first intermediate shaft constant engagement driven gear, the second intermediate shaft constant engagement driven gear and the first intermediate shaft three gear, the second intermediate shaft three gear above.

4. The heavy-duty truck electric drive system of claim 1, wherein, When three four gear tooth sleeve is combined with three gear driven gear, power is transmitted from the motor to the front box input gear, and power is transmitted to the front box output gear through the front box intermediate driven gear and the front box intermediate driving gear;Power is transmitted to the output shaft through the first intermediate shaft, the second intermediate shaft, and the first intermediate shaft constant engagement driven gear, the second intermediate shaft constant engagement driven gear and the first intermediate shaft three gear, the second intermediate shaft three gear above.

5. The heavy-duty truck electric drive system of claim 1, wherein, When the three-fourth gear tooth sleeve combines with the rear trunk always meshing driving gear, power is transmitted from the motor to the front trunk input gear, and then transmitted to the front trunk output gear through the front trunk intermediate driven gear and the front trunk intermediate driving gear; the power is further transmitted to the output shaft through the rear trunk always meshing driving gear.

Images