Automatic transmission for electric vehicle

Patent metadata

Field	Value
Publication number	US-10088025-B2
Application number	US-201414917119-A
Country	US
Kind code	B2
Filing date	Sep 4, 2014
Priority date	Sep 24, 2013
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

An automatic transmission for an electric vehicle includes: a belt type continuously variable transmission mechanism; a constantly meshed parallel shaft type gear transmission mechanism which is connected to an output portion of the belt type continuously variable transmission mechanism, and which has a plurality of shift stages; an input gear which is disposed to the input shaft to be rotated relative to the input shaft, and which is drivingly connected to one of a plurality of shift gears fixed to an output side shaft of the constantly meshed parallel shaft type gear transmission mechanism; and an engaging clutch mechanism which is disposed to the input shaft, and which selectively connects one of the input portion of the belt type continuously variable transmission mechanism and the input gear to the main electric motor.

First claim

The invention claimed is:

1. An automatic transmission for an electric vehicle, the automatic transmission which is provided to the electric vehicle arranged to run only by a main electric motor as a driving source, the automatic transmission comprising:
a belt type continuously variable transmission mechanism which has an input portion that is disposed to be selectively rotatable relative to an input shaft connected to the main electric motor, and in which a winding radius of a pulley and a clamping force are adjusted by an electric actuator and a mechanical reaction force mechanism;
a constantly meshed parallel shaft type gear transmission mechanism which is connected to an output portion of the belt type continuously variable transmission mechanism, and which has a plurality of gear stages, and which is arranged to vary a speed of an output rotation of the belt type continuously variable transmission mechanism at each of the plurality of gear stages;
a direct connection gear comprising an input gear which is disposed to the input shaft to be selectively rotatable relative to the input shaft, and which is drivingly connected to one of a plurality of shift gears fixed to an output side shaft of the constantly meshed parallel shaft type gear transmission mechanism; and
an engaging clutch mechanism which is disposed to the input shaft, and which selectively connects one of the input portion of the belt type continuously variable transmission mechanism or the input gear of the direct connection gear to the input shaft connected to the main electric motor.

2. The automatic transmission for the vehicle as claimed in claim 1 , wherein a torque cam mechanism is provided in the mechanical reaction force mechanism; the electric actuator includes a worm gear including a worm and a worm wheel, and an electric motor arranged to rotationally drive the worm; the torque cam mechanism is arranged to adjust the clamping force of the pulley; and the electric actuator is arranged to adjust the winding radius of the pulley.

3. The automatic transmission for the vehicle as claimed in claim 1 , wherein the input gear has a teeth number substantially identical to a teeth number of a gear of the constantly engaging parallel shaft transmission mechanism which is configured to engage with the input gear.

Assignees

• Jatco Ltd

Inventors

• Yamada Atsushi
• Segawa Toshiaki
• Okamoto Toshiyuki
• Yokoyama Kazuhiko
• Oguri Kazuo
• Yamazaki Takuya

Classifications

• F16H61/662

  with endless flexible members · CPC title

• F16H63/062

  electric or electro-mechanical actuating means · CPC title

• F16H2037/025

  having continuously variable friction gearing, i.e. CVT, in which the ratio coverage is used more than once to produce the overall transmission ratio coverage, e.g. by shift to end of range, then change ratio in sub-transmission and shift CVT through range once again · CPC title

• F16H37/021 Primary

  toothed gearing combined with continuously variable friction gearing · CPC title

• F16H2037/023

  the combined gearing being provided with at least two forward and one reverse ratio in a serially arranged sub-transmission · CPC title