Electric transmission with friction clutch disengagement device
AssigneeDana Automotive Systems Group, LLC
InventorsBenjamin Stubbs, Pier Marco Fracchia
Life of this patent
Estimating the term…
Abstract
Systems and methods for a transmission. The transmission system includes, in one example, a dog clutch that is configured to selectively engage a first freewheeling gear that meshes with a first gear. The transmission system further includes an electromechanically or hydraulically actuated friction clutch configured to selectively engage a second freewheeling gear that meshes with a second gear. The transmission system even further includes a friction clutch disengagement device configured to inhibit actuation of the electromechanically or hydraulically actuated friction clutch in response to overrun of the first freewheeling gear.
Claims9
A transmission system, comprising:
- an engagement device configured to selectively engage a first freewheeling gear that is rotationally coupled to a first gear;
- an electromechanically or hydraulically actuated friction clutch configured to selectively engage a second freewheeling gear that is rotationally coupled a second gear;
- and
- a friction clutch disengagement device configured to inhibit actuation of the electromechanically or hydraulically actuated friction clutch in response to the engagement device transferring an overrun torque to the first freewheeling gear, wherein the overrun torque is caused by an operating state of the transmission system;
- wherein the friction clutch is electromechanically actuated and the friction clutch disengagement device is an electric switch that is configured to interrupt a control command that sent to an electronic actuator of the electromechanically actuated friction clutch to induce friction clutch disengagement.
A method for operation of a transmission system, comprising:
- operating an electromechanically or hydraulically actuated friction clutch and a dog clutch;
- wherein a friction clutch disengagement device inhibits actuation of the electromechanically or hydraulically actuated friction clutch in response to the dog clutch transferring overrun torque to the first freewheeling gear, wherein the overrun torque is caused by an operating state of the transmission system;
- and
- wherein the transmission system includes:
- the dog clutch that is configured to selectively engage the first freewheeling gear that meshes with a first gear;
- the electromechanically or hydraulically actuated friction clutch that is configured to selectively engage a second freewheeling gear that meshes with a second gear;
- and
- the friction clutch disengagement device;
- wherein the friction clutch disengagement device is:
- an electric switch that is configured to interrupt a control command that sent to an electronic actuator of the electromechanically actuated friction clutch to induce friction clutch disengagement.
A two-speed transmission system, comprising:
- a dog clutch configured to selectively engage a first freewheeling gear that meshes with a first gear;
- an electromechanically or hydraulically actuated friction clutch configured to selectively engage a second freewheeling gear that meshes with a second gear;
- and
- a friction clutch disengagement device configured to inhibit actuation of the electromechanically or hydraulically actuated friction clutch in response to the dog clutch transferring overrun torque to the first freewheeling gear, wherein the overrun torque is caused by an operating state of the transmission system;
- wherein:
- the electromechanically or hydraulically actuated friction clutch is hydraulically actuated and the friction clutch disengagement device is a dump valve that directs fluid away from a hydraulic actuator of the friction clutch in response to overrun of the first freewheeling gear;
- the dog clutch and the electromechanically or hydraulically actuated friction clutch are positioned coaxial to an intermediate shaft;
- and
- the dump valve is axially actuated.
Dependencies are inferred from the claim text.