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Two-speed transmission for pure electric vehicle and speed changing method

A pure electric and transmission technology, applied in the direction of transmission, belt/chain/gear, mechanical equipment, etc., can solve the problem of single-speed gearbox that is difficult to balance power, efficiency, maximum speed, physical discomfort of passengers, and driving safety factor Low-level problems, to achieve the effect of flexible and efficient vehicle torque transmission, high transmission efficiency, and improved comfort

Pending Publication Date: 2019-03-08
上海伊控动力系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the power needs to be improved, the speed ratio needs to be increased; if the maximum speed needs to be increased, the speed ratio needs to be reduced. Therefore, it is difficult for a single-speed gearbox to take into account the requirements of power, efficiency, and maximum speed.
[0003] The existing two-speed gearbox uses a synchronizer to shift gears. For high-speed vehicles, there is power interruption in the gear shift, and the driving safety factor is low. It is easy to cause the passengers to feel uncomfortable during the driving process.

Method used

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  • Two-speed transmission for pure electric vehicle and speed changing method
  • Two-speed transmission for pure electric vehicle and speed changing method
  • Two-speed transmission for pure electric vehicle and speed changing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A two-speed transmission for pure electric vehicles, such as figure 1 As shown, it includes a transmission housing 5, which includes a drive motor 1, an input gear 2, an input shaft 3, an intermediate shaft 16, an intermediate gear 15, a planetary gear train 6, a first power module, a second power module, and a differential device 14;

[0033] The drive motor is splined to the input shaft, the input shaft is provided with the input gear, the intermediate shaft is provided with an intermediate gear and a sun gear 7, and the intermediate gear meshes with the input gear; The planetary gear train includes a planet carrier 8, the sun gear, a planetary gear 9 and a ring gear 10;

[0034] The first power module includes a first clutch 4 and the sun gear, the first clutch is provided with a first inner ring and a first outer ring, the first inner ring is fixedly connected with the intermediate shaft, and the the first outer ring is fixedly connected with the planet carrier; ...

Embodiment 2

[0039] The present invention also provides a dual motor driving method, such as Figure 2-Figure 4 shown, including the following steps:

[0040] S1. During the acceleration stage of the vehicle, the two-speed transmission is in the first-speed working state. At this time, the vehicle obtains the maximum transmission ratio and transmits torque. When the vehicle accelerates, the first clutch is disengaged, the second clutch is engaged, and the drive The torque of the motor is transmitted to the input gear through the input shaft, and the input gear and the intermediate gear transmit the torque to the intermediate shaft through gear meshing, and the intermediate shaft is synchronized with the sun gear, thereby transmitting the torque It is transmitted to the main reduction input gear, and then transmitted to the main reduction output gear through gear meshing, and finally the torque is transmitted to the vehicle wheels through the differential to drive the vehicle to start and a...

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Abstract

The invention discloses a two-speed transmission for a pure electric vehicle. The two-speed transmission for the pure electric vehicle comprises a transmission shell. The transmission comprises a drive motor, an input gear, an input shaft, an intermediate shaft, an intermediate gear, a planetary gear train, a first power module, a second power module and a differential mechanism. The drive motor is in spline connection with an input shaft. The input shaft is provided with the input gear. The intermediate shaft is provided with the intermediate gear and a sun gear. The intermediate gear is meshed with the input gear. The planetary gear train comprises a planetary rack, a sun gear, a planet gear and a gear ring. The first power module comprises a first clutch and a sun gear. The second powermodule comprises a second clutch, a main speed reduction input gear and a main speed reduction output gear. The main speed reduction input gear is meshed with the main speed reduction output gear. The differential mechanism is fixedly connected with the main speed reduction output gear through a bolt. The two-speed transmission for the pure electric vehicle can meet the requirements for the vehicle power performance, highest vehicle speed and the like, the transmission efficiency of the power system is higher, power gear shifting is free of interruption, the comfort of passengers is improved,and the market application prospect is broad.

Description

technical field [0001] The invention relates to the field of electric vehicle power system design, in particular to a two-speed transmission for pure electric vehicles and a speed change method. Background technique [0002] At present, pure electric vehicles basically use a single-speed electric drive system. Since it is a single-speed reduction box, the gear ratio is fixed. If you need to improve the power, you need to increase the speed ratio; if you need to increase the maximum speed, you need to reduce the speed ratio, so it is difficult for a single-speed gearbox to take into account the requirements of power, efficiency, and maximum speed. [0003] The existing two-speed gearbox uses a synchronizer to shift gears. For a vehicle in a high-speed driving state, there is a power interruption in shifting, and the driving safety factor is low, and the occupants are likely to feel uncomfortable during the driving process of the vehicle. SUMMARY OF THE INVENTION [0004] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H37/08
CPCF16H37/082
Inventor 朱雷房超杨守银吴四军周用华薛刚段仁仕樊晓虹张英伦
Owner 上海伊控动力系统有限公司
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