Patent ID: 8752444
Filing Date: 2014-06-17
Classification: F16H,Y10T

Abstract:
1. Electro-hydraulic control apparatus for a motor-vehicle transmission having at least five forward gears and one reverse gear, the apparatus comprising: first, second and third shift forks, each movable in at least one engagement position to engage a respective gear, first, second and third hydraulic actuators each arranged to control the movement of a respective shift fork in the respective at least one engagement position, and a slide valve selectively movable into one of at least three operating positions in each of which the slide valve selects a respective hydraulic actuator, wherein a first operating position is an end-of-travel position and corresponds to the selection of the first hydraulic actuator, and wherein a second operating position is also an end-of-travel position and corresponds to the selection of the second hydraulic actuator, wherein the first hydraulic actuator is associated at least to the first gear and the second hydraulic actuator is associated at least to the reverse gear, wherein the first shift fork is movable between first and second engagement positions to engage the first gear and another odd gear, respectively, the second shift fork is movable between first and second engagement positions to engage the reverse gear and an odd gear, respectively, and the third shift fork is movable between first and second engagement positions to engage the second gear and another even gear, respectively, wherein the first, second and third hydraulic actuators are double-acting actuators, wherein the control apparatus further comprises first and second gear shift solenoid valves for controlling the supply of fluid to the hydraulic actuator each time selected by the slide valve or the connection of said hydraulic actuator with a tank, wherein the first and second gear shift solenoid valves are three-way two-position proportional solenoid valves.