Patent ID: 8447478
Filing Date: 2013-05-21
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: a first shift fork selectively movable between two engagement positions to engage the first gear or the third gear, respectively, a second shift fork selectively movable between two engagement positions to engage the second gear or the fourth gear, respectively, a third shift fork selectively movable between two engagement positions to engage the fifth gear or the reverse gear, respectively, first, second and third double-acting hydraulic actuators, each of which is arranged to control the movement of a respective shift fork between the two engagement positions thereof, and includes first and second chambers and a plunger, a slide valve selectively movable among at least three operating positions in each of which the slide valve selects a respective hydraulic actuator, and first and second gear shift solenoid valve arranged to be connected each to a respective chamber of the hydraulic actuator each time selected by the slide valve for controlling the supply of fluid to the hydraulic actuator each time selected by the slide valve for controlling the supply of fluid to the hydraulic actuator or the connection of this actuator to a tank, wherein the apparatus is configured in such a manner that in operation the engagement of the first gear is controlled by the first gear shift solenoid valve, whereas the engagement of the second gear is controlled by the second gear shift solenoid valve.