US 9,809,098 B2
Two-speed transmission for electric vehicle
Chia Tsao, New Taipei (TW); Jui-Tang Tseng, Hsinchu (TW); Kun-Ju Xie, Changhua County (TW); and Tsung-Han Wu, Kaohsiung (TW)
Assigned to INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed by INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed on Dec. 16, 2015, as Appl. No. 14/972,080.
Claims priority of application No. 104136306 A (TW), filed on Nov. 4, 2015.
Prior Publication US 2017/0122413 A1, May 4, 2017
Int. Cl. F16H 3/44 (2006.01); B60K 1/00 (2006.01); F16H 3/66 (2006.01)
CPC B60K 1/00 (2013.01) [B60K 2001/001 (2013.01); F16H 3/66 (2013.01); F16H 2200/0034 (2013.01); F16H 2200/2007 (2013.01); F16H 2200/2035 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A two-speed transmission for an electric vehicle, comprising:
an electric motor, comprising a rotor and a spindle;
a first transmission mechanism being furnished on the spindle further comprising a first ring gear, a first planet bracket, a first planet gear, a first sun gear and a first clutch, wherein the first planet gear is furnished on the first planet bracket and meshed between the first ring gear and the first sun gear, the rotor drives the first sun gear and the first planet gear to rotate with respect to the first ring gear to generate a first gear ratio; and
a second transmission mechanism furnished on the spindle and comprising a second ring gear, a second planet bracket, a second planet gear, a second sun gear and a second clutch, wherein the second planet gear is furnished on the second planet bracket and meshed between the second ring gear and the second sun gear, and the rotor drives the second sun gear and the second planet gear to rotate with respect to the second ring gear to generate a second gear ratio, and the second gear ratio is different from the first gear ratio;
wherein, when the first clutch is activated to connect with the spindle, the second clutch separates from the spindle, and the electric motor outputs a first torque corresponding to the first gear ratio to the spindle;
when the second clutch is activated to connect with the spindle, the first clutch separates from the spindle, and the electric motor outputs a second torque corresponding to the second gear ratio to the spindle.