Transmission

摘要

A transmission includes first and second rotating shafts arranged in parallel and multiple gear sets including gears fixed to the first rotating shaft and rotatable gears rotatably supported on the second rotating shaft. Each gear set includes first and second engagement units engaged with first and second engagement-target portions formed on end surfaces of each rotatable gear and transmitting torque in first and second rotational directions; and a shift mechanism axially and independently moving the first and second engagement units. Each one of the first and second engagement units has a slanted portion allowing the engagement unit to withdraw from the rotatable gear when the other one of the engagement units is disengaged and torque transmitted in a corresponding direction is input. Each one of the first and second engagement unit of each gear set moves integrally with the other one of the engagement units of an adjacent gear set.

主权项

1. A transmission comprising:
a first rotating shaft; a second rotating shaft arranged in parallel with the first rotating shaft; and a plurality of gear sets that transmit power between the first rotating shaft and the second rotating shaft and that are arranged in order from low to high gear ratios, wherein each gear set includes a fixed gear that is fixed to the first rotating shaft and a rotatable gear that is supported on the second rotating shaft so as to be rotatable relative to the second rotating shaft and that meshes with the fixed gear, wherein each gear set includes first engagement means that is engaged with a first engagement-target portion formed on one end surface of the rotatable gear and thus transmits torque in a first rotational direction, second engagement means that is engaged with a second engagement-target portion formed on another end surface of the rotatable gear and transmits torque in a second rotational direction that is a direction opposite to the first rotational direction, and a shift mechanism that moves the first engagement means and the second engagement means independently of each other and relative to the rotatable gear in an axial direction, wherein the first engagement means has a slanted portion that is contacted by the first engagement-target portion and thus allows the first engagement means to withdraw from the rotatable gear while the second engagement means is disengaged and when torque in the second rotational direction is input, wherein the second engagement means has a slanted portion that is contacted by the second engagement-target portion and thus allows the second engagement means to withdraw from the rotatable gear while the first engagement means is disengaged and when torque in the first rotational direction is input, and wherein the first engagement means of each gear set is configured to move integrally with the second engagement means of an adjacent one of the gear sets, and the second engagement means of each gear set is configured to move integrally with the first engagement means of an adjacent one of the gear sets.