Transmission device
AssigneeJtekt Corporation
InventorTakafumi Uemoto
Life of this patent
Estimating the term…
Abstract
A transmission has a simple structure and can be produced at a low cost. A second electromagnetic clutch is shut off at a timing when an electric motor is decelerated and before selecting motion is finished, and thereafter, a shift/select shaft is moved to a terminal end position of the selecting motion with an inertia of a driven part (a second output hub) of the second electromagnetic clutch. At a timing after a predetermined period has passed from the timing, a first electromagnetic clutch for the next shifting motion is connected. The electric motor is driven synchronously with the end of the selecting motion or immediately in response to the end, thereby to start the next shifting motion. In this manner, gear change can be rapidly conducted.
Claims8
A transmission device comprising:
- a single electric motor;
- clutches capable of connecting or shutting off power transmission from the electric motor;
- a controller configured to control motions of the electric motor and the clutches;
- a shift/select shaft configured to be rotated around its center axis thereby to perform a shifting motion, and configured to be moved in an axial direction thereby to perform a selecting motion;
- a first driving power transmitting mechanism configured to allow the shift/select shaft to perform the shifting motion using a power from the electric motor via one of the clutches;
- a second driving power transmitting mechanism configured to allow the shift/select shaft to perform the selecting motion using a power from the electric motor via the other of the clutches;
- and
- a guiding mechanism configured to guide the selecting motion and the shifting motion of the shift/select shaft up to respective terminal end positions,
- wherein the controller shuts off the clutch at a predetermined timing when the electric motor is decelerated and before the shift/select shaft arrives at the terminal end position of one of the shifting motion and the selecting motion, and moves the shift/select shaft up to the terminal end position of the one of the shifting motion and the selecting motion with an inertia of a driven part of the clutch.
Dependencies are inferred from the claim text.