Patent ID: 9719584
Date: 2017-08-01
CPC Classifications: B60K,B60Y,F16H

Claim:
1. A two-speed transaxle for an electric vehicle, comprising: an electric motor and transaxle drivable by the electric motor; wherein, the transaxle comprises a epicylic gear set, a first dry brake disc, a second dry brake disc, which are arranged coaxially to a rotational electric motor rotor shaft axis; the epicylic gear set comprises a base sun gear member, a first sun gear member, a second sun gear member, a plurality of base planet gears, a plurality of idler planet gears, a plurality of first planet gears, a plurality of second planet gears and a common planet carrier; the base sun gear member is rotatingly drivable by the electric motor around the rotational axis of the electric motor rotor shaft; the first sun gear member is simultaneously connected to the first dry brake disc and an inner race of a overrunning or one-way clutch through a first brake shaft; an outer race of the one-way clutch is fixed to a two-speed transaxle casing; the second sun gear member is connected to a second dry disc through a second brake shaft; a first caliper disc brake system and a second caliper disc brake system are mounted on the outside of the two-speed transaxle casing; the first caliper disc brake system comprises a first dry disc, a first speed sensors for watching state of the first dry disc, a first left pad plate, a first right pad plate, two pairs of first independent hydraulic pistons and two first calipers; the second caliper disc brake system comprises a second dry disc, a second speed sensors for watching state of the second dry disc, a second left pad plate, a second right pad plate, two pairs of second independent hydraulic pistons and two second calipers; and the plurality of base planet gears, idler planet gears, first planet gears and second planet gears are mounted on the common planet carrier, a first drive gear is roatationaly fixed or formed on the common planet carrier, the first drive gear is an output member for the epicylic gear set to transmit the power form the electric motor to a differential assembly; the first and second dry brake discs are mounted on outside of the two-speed transaxle casing; the transaxle further comprises a first shifting system and a second shifting system, the first shifting system is used to engage or disengage the first dry brake disc with the two-speed transaxle casing, and the second shifting system is used to engage or disengage the second dry brake disc with the two-speed transaxle casing; the first shifting system comprises a first shifting electric motor, a first hydraulic actuator cylinder, a first pressure warning switch and a first oil tank; the second shifting system comprises a second shifting electric motor, a second hydraulic actuator cylinder, a second pressure warning switch and a second oil tank; and the first and second shifting systems are mounted on the outside of the two-speed transaxle casing.