Gearbox for electric drive train

A gearbox and drive train technology, applied in the direction of electric power devices, power devices, control devices, etc., can solve the problems of not enough to start the vehicle, the efficiency of the motor is not optimal, and the durability of the transmission is reduced.

Pending Publication Date: 2022-07-29
VOLVO LASTVAGNAR AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem with using a gearbox with a fixed ratio is that the electric motor will run at high speed and low torque in cruise mode conditions, but the efficiency of the motor is not optimal under these conditions
In addition, high speed conditions increase the stress on the gears, bearings and seals of the transmission, which reduces the durability of the transmission
[0008] Also, gearboxes with gears spinning at high speeds can create lubrication problems: in fact, a gear that spins too fast may not be properly lubricated because the oil between two consecutive teeth is thrown out by centrifugal force, creating a gap between the two meshing gears. Metal-to-metal contact may occur between the teeth, which generates heat and therefore may cause irreversible mechanical damage
However, it can have an impact on starting performance, as the ratio in the lowest gear may not be sufficient to start the vehicle, especially in the field of heavy vehicles

Method used

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  • Gearbox for electric drive train
  • Gearbox for electric drive train
  • Gearbox for electric drive train

Examples

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Embodiment Construction

[0039] figure 1 A vehicle is shown, which is an electric, fuel cell or hybrid vehicle, ie a vehicle that uses electrical energy as a power source. In this example, the vehicle is a truck 2, comprising two axles 4 and 6, a front axle 6 and a rear axle 4, respectively.

[0040] Obviously, in alternative embodiments, the vehicle may include one or more additional axles.

[0041] At least one of the two axles 4 and 6 is motorized, ie includes at least one electric motor. In this example, we consider that only the rear axle 4 is motorized, ie the vehicle 2 is a propulsion vehicle (of which only the rear axle(s) are motorized). However, the invention is obviously also applicable to all-wheel drive vehicles as well as tractor vehicles in which only the front axle(s) are motorized.

[0042] The axle 4 includes a powertrain 5 including a first electric motor (or "E-motor") EM1 and preferably a second electric motor EM2. In this example, the two electric motors EM1 and EM2 are identi...

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Abstract

The invention relates to a gearbox (G1) for an electric drive train (5), comprising: a main shaft (20) on which a first main gear (21), a second main gear (22) and a third main gear (23) are arranged, the first main gear being rotationally fixed relative to the main shaft; and a countershaft (30) on which are arranged a first pinion (31) which meshes with the first main gear and which is default free to rotate around the countershaft, a second pinion (32) which meshes with the second main gear, and a third pinion (33) which meshes with the third main gear. The gearbox further comprises a first coupling member (40) arranged along the countershaft (30) and movable between an engaged position, in which the first coupling member rotationally couples the first pinion (31) with the countershaft (30), and a neutral position, in which the first pinion is rotatable about the countershaft. The gearbox further comprises a second coupling member (18) arranged along one shaft (20) of the primary and secondary shafts (20, 30) and movable between a first position in which one (22) of the second and third gears (22, 23) is rotationally coupled with said one shaft (20), a second position in which one (22) of the second and third gears (22, 23) is rotationally coupled with said one shaft (20), and a neutral position in which one (22) of the second and third gears (22, 23) is rotationally coupled with said one shaft (20). The second coupling member is movable between a second position in which the other (23) of the second and third gears (22, 23) is rotationally coupled with the one shaft, and a neutral position in which the second and third gears (22, 23) are rotatable about the one shaft.

Description

technical field [0001] The present invention relates to a gearbox for an electric drive train. [0002] Typically, the present invention is applied to a gearbox that is part of an electric drivetrain integrated into a vehicle axle. Such an electric axle (or "E-axle") is a front or rear axle that includes an axle body (or "housing") adapted to receive a powertrain arranged to be used with to provide torque to the wheels of the axle. The "E-axle" is a compact and economical electric drive solution for battery electric vehicles, fuel cell and hybrid applications. The electric motor(s), the electronics and the transmission are combined in a compact unit which directly drives the wheels arranged at the longitudinal ends of the axles. [0003] The present invention can be applied to medium and heavy duty vehicles such as trucks, buses and construction equipment, as well as passenger cars. Although the present invention will be described with respect to trucks, the present invent...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B60K1/00B60K1/02B60K17/02B60K17/08B60K17/16
CPCB60K1/00B60K1/02B60K17/02B60K17/08B60K17/165Y02T10/62
Inventor让·泰拉特托马斯·巴里约扬·亨德里克斯
OwnerVOLVO LASTVAGNAR AB