Patent ID: 11933398
Assignee: UNIPRES CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B  Y | IPC B  F

Claim 0:
1. A two-speed transmission apparatus for an electric vehicle which uses an electric motor for driving wheels, comprising:
a housing;
an input axis which is supported by said housing and is connected to an electric rotational driving motor side;
an output axis which is supported by said housing and is connected to said wheels sides;
a first gear mechanism comprising gears to mesh in order to get a transmission ratio of a first speed between said output axis and said input axis when said input axis is connected;
a second gear mechanism comprising gears to mesh in order to get a transmission ratio of a second speed, which is higher gear ratio than said first speed of a same rotational direction, between said output axis and said input axis when said input axis is connected;
a first multi-plate friction clutch to get said transmission ratio of said first speed by transmitting a rotation of said input axis to said first gear mechanism at a fastening time;
a second multi-plate friction clutch which is coaxially and separately in a axial direction arranged on said first multi-plate friction clutch, and to get said transmission ratio of said second speed by transmitting said rotation of said input axis to said second gear mechanism at said fastening time; and
an actuator to selectively fasten said first multi-plate friction clutch and said second multi-plate friction clutch,
wherein said actuator comprises:
a control motor being a torque source;
gears to mesh for a torque transmission;
an inside diameter member and an outside diameter member to screw to convert a torque into a thrust;
a thrust transmission member for transmitting said thrust; and
a clutch pressure member to press said first multi-plate friction clutch and/or said second multi-plate friction clutch in order to fasten by said thrust, and

wherein said inside diameter member is arranged so as to receive a torque from torque transmission gears, and said outside diameter member is slidably supported by said housing in order to convert said thrust applied to said inside diameter member into said thrust.