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Two-gear automatic speed changing system for electric automobile

An automatic transmission, electric vehicle technology, applied in the direction of transmission box, transmission, transmission parts, etc., can solve the problem of power interruption, and achieve the effect of no power interruption and simple structure

Inactive Publication Date: 2014-10-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a two-speed automatic transmission system for electric vehicles driven by a motor, while maintaining the advantages of power shifting of automatic transmissions, it overcomes the shortcoming of power interruption during power transmission of existing automatic transmissions

Method used

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  • Two-gear automatic speed changing system for electric automobile
  • Two-gear automatic speed changing system for electric automobile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, a two-speed automatic transmission system for electric vehicles is mainly composed of a motor 7, a planetary mechanism, a clutch A, a brake B, a control unit ECU and a gearbox body; the motor 7 is connected to the motor rotor shaft 8; one end of the clutch A It is connected with the rotor shaft of the motor, and the other end is connected with the ring gear 14 of the planetary mechanism; the sun gear 17 of the planetary mechanism is connected with the rotor shaft of the motor as the input end, and the planet carrier 15 is connected with the drive axle 19 as the output end of the gearbox, and the drive axle 19 Through the half shaft 20, it is connected with the two wheels 6 respectively; the brake B is connected with the ring gear 14 of the planetary mechanism as a braking element, so as to control the movement of the elements of the planetary mechanism. The control unit is respectively connected with the clutch driving mechanism, the brake dri...

Embodiment 2

[0026] The clutch of the two-speed automatic transmission system for electric vehicles adopts a hydraulic friction plate clutch, which is mainly composed of a housing, a piston, a steel plate, a friction plate, a return spring, a sealing ring and a snap ring, and the connection arrangement of other components is the same as in Example 1. Similarly, the working principle of this embodiment is basically the same as that of Embodiment 1. The operating mechanism of the hydraulic friction disc clutch is hydraulic. Compared with the mechanical operating mechanism, it has the characteristics of small frictional resistance, small mass, and soft combination. However, the sealing problem of the control oil is involved in the implementation process.

Embodiment 3

[0028] The clutch of the two-speed automatic transmission system for electric vehicles adopts an electromagnetic clutch, which is mainly composed of a yoke, an armature, a flange, a rivet and a spring leaf. Compared with the diaphragm spring clutch, the electromagnetic clutch has the characteristics of high speed response, strong durability and easy assembly and maintenance. The yoke is connected to the rotor shaft of the motor through a spline, and the flange is connected to the ring gear through a key. When the coil is energized, a magnetic flux is generated to attract the armature, thereby generating a friction torque to combine the driven part. The connection arrangement of other components is the same as that of Embodiment 1, and the working principle of this embodiment is basically the same as that of Embodiment 1, so it will not be repeated here.

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Abstract

The invention discloses a two-gear automatic speed changing system for an electric automobile. The two-gear automatic speed changing system for the electric automobile is mainly formed by a motor, a planet mechanism, a clutch A, a brake B, a control unit and a speed changing box body, wherein the motor is connected with a motor rotor shaft. The two-gear automatic speed changing system for the electric automobile is characterized in that one end of the clutch is connected with the motor rotor shaft; the other end is connected with a gear ring of the planet mechanism; a sun gear of the planet mechanism which is served as an input end is connected with the motor rotor shaft; a planet frame which is served as an input end of a speed change box is connected with a driving axle; the brake is connected with the gear ring of the planet mechanism; the control unit in signal connection with a clutch driving mechanism, a brake driving mechanism and a motor controller; the clutch driving mechanism, the brake driving mechanism and the motor controller are connected with the clutch, the brake and the motor. The two-gear automatic speed changing system for the electric automobile achieves direct-gear and speed-reducing-gear transmission due to the fact that the planet mechanism, the clutch and the brake are matched in utilization and reverse gear is achieved due to reverse rotation of the motor.

Description

technical field [0001] The invention relates to an automatic transmission system for an electric vehicle, in particular to a two-speed automatic transmission system for an electric vehicle. technical background [0002] Due to the increasing reduction of global energy sources and the aggravation of environmental pollution, electric vehicles have become the focus of attention. Compared with traditional internal combustion engines, electric vehicle traction motors have a wider operating range, and the characteristics of constant torque at low speed and constant power at high speed are more suitable for vehicle operation requirements. In recent years, automatic transmissions for electric vehicles that can maintain high-efficiency transmission have become a research hotspot. The earliest manual transmission (MT) realizes the shift of gears through clutches and manual shift forks. This transmission has the advantages of simple structure, compact shape, high transmission efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/44F16H57/02F16H57/10
CPCF16H3/44F16H57/02F16H57/10F16H2057/02034F16H2057/087
Inventor 罗玉涛
Owner SOUTH CHINA UNIV OF TECH