Single-gear-ring dry-friction external-control three-gear transmission

Abstract

The invention discloses a single-gear-ring dry-friction external-control three-gear transmission. The single-gear-ring dry-friction external-control three-gear transmission comprises a planetary gear train transmission case and a gear shift control element outside the case, wherein the planetary gear train transmission case comprises a first gear set, a second gear set, a planetary carrier, a gear ring and a case body; the first gear set comprises a first sun gear and a first planet gear; the second gear set comprises a second sun gear and a second planet gear, and the second planet gear is further separately engaged with the first planet gear and the gear ring; the first planet gear and the second planet gear are separately arranged on the planetary carrier, and the planetary carrier is connected with one end of a power output shaft; the gear shift control element comprises a first brake for braking the first planet gear, a second brake for braking the gear ring and a clutch. According to the transmission, through controlling the clutch, the first brake and the second brake, the stability of few-gear and large-speed-regulation-range gear shift is achieved, radial and axial dimensions of the transmission are reduced, and thus, the transmission can be extensively applied to electric automobiles.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a single ring gear dry friction externally controlled three-speed transmission. Background technique [0002] In order to improve the average operating efficiency of the drive system of electric vehicles, transmissions with fewer gears are gradually being widely used. Compared with the second-speed transmission, the third-speed transmission has a larger speed regulation range and can better adapt to different road conditions. [0003] Patent CN201410469720 realizes 3-speed automatic transmission by wire control instead of traditional hydraulic and mechanical shifting methods; patent CN201510228009 discloses a compound gear train 3-speed transmission, using one brake and two clutches in the box to realize planetary gear train The change of the power transmission route between the gear train and the fixed shaft achieves the shifting operation; the patent CN201520197213 adds an auxiliary...

AI Technical Summary

Problems solved by technology

[0007] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a single ring gear dry friction externally controlled three-speed transmission, aiming at solving the current shift stability with few gears and large speed regulation range, mainly by solving the problem of the transmission The radial and axial dimensions are large, so it is not used in the application of electric vehicles; the frictional heat and wear particles of the control components will affect the dry friction in the box and the externally controlled transmission oil. The working quality, large shifting impact and long response time and other issues to improve the stability of shifting

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