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Two-gear mechanical automatic transmission for electric vehicle

An automatic transmission and electric vehicle technology, applied in the field of automobile transmission system, can solve the problems of poor transmission scalability, poor shifting performance, output shaft, and uneven force on bearings, so as to reduce product cost and development cycle, good inheritance, The effect of reducing fever

Inactive Publication Date: 2019-05-21
重庆德音科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention intends to provide a two-speed mechanical automatic transmission for electric vehicles to solve the problem of insufficient power when climbing a slope or starting at a low speed in electric vehicles with a fixed transmission ratio in the prior art, and the poor shifting performance of two-speed mechanical automatic transmissions The problem of uneven force on the bearings on the output shaft and poor scalability of the transmission

Method used

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  • Two-gear mechanical automatic transmission for electric vehicle
  • Two-gear mechanical automatic transmission for electric vehicle
  • Two-gear mechanical automatic transmission for electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment one is basically as figure 2 As shown, the two-speed mechanical automatic transmission for electric vehicles includes a drive motor 1, a casing 2, and an input shaft 3 and an output shaft 4 for power transmission. The casing 2 includes a double-row, two-stage planetary gear set, a first The brake 5, the second brake 6 and the first gear set 7; the double-row double-stage planetary gear set includes a front row planetary gear set 8 and a rear row planetary gear set 9, and the motor shaft of the drive motor 1 is connected to the input shaft 3 through a spline , the output shaft 4 is connected with the wheel of the electric vehicle through a coupling.

[0036] The front row planetary gear set 8 includes the front row sun gear 10, the front row planetary gear 11 and the ring gear 12, the rear row planetary gear set 9 includes the rear row sun gear 13, the rear row planetary gear 14 and the planet carrier 15, and the rear row planetary gear 14 and the front plan...

Embodiment 2

[0062] Embodiment two is basically as image 3 As shown, there are two differences between Embodiment 2 and Embodiment 1. The first point is to change the braking components of the second brake 6. In Embodiment 2, the second brake 6 is used to brake the ring gear 12, and the double row The output of the double-stage planetary gear set is the front sun gear 10; secondly, in the second embodiment, the second gear set 18 is added, the second gear set 18 is located in the housing 2, and the second gear set 18 includes the second active The gear 19 and the second driven gear 20 , the second driving gear 19 is fixedly connected with the input shaft 3 , and the second driven gear 20 is fixedly connected with the rear sun gear 13 .

[0063] The gear ratio between the second driven gear 20 and the second driving gear 19 of the second gear set 18 is 2.5.

[0064] Specific working process:

[0065] When in neutral, the control unit of the electric vehicle controls both the first brake ...

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Abstract

The invention relates to the field of vehicle transmission systems, and particularly discloses a two-gear mechanical automatic transmission for an electric vehicle. The two-gear mechanical automatic transmission comprises a shell, an input shaft and an output shaft, wherein the shell internally comprises a double-row two-stage planetary gear set, a first brake and a second brake, the double-row two-stage planetary gear set includes a front-row planetary gear set and a rear-row planetary gear set, the rear-row planetary gear set and the front-row planetary gear set are both connected to a planetary carrier, the rear-row planetary gear set and the front-row planetary gear set are meshed, and the rear-row planetary gear set is meshed with a rear-row sun gear; the first brake is used for braking the planet carrier, and the input shaft drives the rear-row sun gear to rotate; and the second brake is used for braking the front-row planetary gear set, and the front-row planetary gear set drives the output shaft to rotate. According to the scheme, the first brake, the second brake and the double-row two-stage planetary gear set are matched, and the problem that in the proper art, during climbing or low-speed starting of the electric vehicle, the power is insufficient, the transmission is poor in gear shifting performance, and the transmission is poor in scalability are solved.

Description

technical field [0001] The invention relates to the field of automobile transmission systems, in particular to a two-speed mechanical automatic transmission for electric automobiles. Background technique [0002] With the depletion of fuel resources, automobiles are gradually changing from fuel vehicles to electric vehicles. In the existing technology, the drive motor has the characteristics of low speed constant torque, high speed constant power and wide working range. Therefore, many domestic OEMs Electric vehicles with fixed speed ratio are developed on the basis of traditional vehicles, and the performance of electric vehicles with fixed speed ratio can basically meet the driving requirements. But in fact, due to the complex road conditions, when an electric vehicle with a fixed transmission ratio starts at a low speed or climbs a slope, in the output mode of the low-speed constant torque of the motor, the torque of the motor is constant and the vehicle has a fixed trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/58F16H57/023F16H61/04
Inventor 郑光泽黄修鹏李晓峰欧康胡明珍
Owner 重庆德音科技有限公司
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