TWO-STAGE TRANSMISSION FOR ELECTRICALLY DRIVEN VEHICLE

WIPO Patent Application WO/2021/010138

A1

The present invention relates to a two-stage transmission for an electric vehicle, the two-stage transmission including a dog clutch and a friction clutch, and the purpose of the present invention is to prevent torque drop during shifting. The two-stage transmission for an electric vehicle comprises: a planetary gear mechanism (12); a dog clutch (28); a friction clutch (30); an armature (26) for switching between the dog clutch (28) and the friction clutch (30); and an electromagnetic coil (31) for driving the armature (26). In the dog clutch (28) and the friction clutch (30), a connection relationship between rotating elements of the planetary gear mechanism (12) is set such that deceleration (first speed) is achieved in which the dog clutch is engaged and the friction clutch is disengaged and acceleration (second speed) is achieved in which the dog clutch is disengaged and the friction clutch is engaged. A ratchet type one-way clutch is provided to prevent torque drop during switching, and the ratchet type one-way clutch and the dog clutch are arranged such that the rotational phase positions thereof coincide with each other. When switching from the second speed to the first speed, the dog clutch is phase-matched by a ratchet, so that cooperation is immediately reached without a phase matching operation, and a shock is prevented. [Selection drawing] FIG. 4

SHIROSAKI RYO (JP)
SUZUKI RYOSUKE (JP)
NEZU HIDEYUKI (JP)
OONO YUTA (JP)
FURUKAWA KENTARO (JP)

PCT/JP2020/025233

January 21, 2021

June 26, 2020

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UNIPRES CORP (JP)

F16H3/54

JP2006234062A	2006-09-07
JP2013133841A	2013-07-08
JP2016109146A	2016-06-20
JP2016017632A	2016-02-01

See also references of EP 3889464A4

MITSUI, Takao (JP)

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