Ratio selector mechanisms
AssigneeKongsberg Techmatic UK Limited
InventorsJohn Spooner, Mark Stanley Willows, David Anthony Harries
Life of this patent
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Abstract
A ratio selector mechanism for the selection of the operative ratio in an associated synchromesh vehicle transmission in which a fluid pressure operated actuator operates synchromesh units. The operating pressure of the actuator is varied either mechanically or electronically during selection of a given ratio in the associated transmission or dependent on the ratio being selected. A first actuator selects a shift rail, and a second actuator engages a gear. A valve member acts against a bias force which is varied based on the position of the first actuator to control the pressure in the second actuator.
Claims11
A ratio selector mechanism for the selection of the operative ratio in a associated synchromesh vehicle transmission in which fluid pressure operated actuating means operates synchromesh units, the mechanism including a first fluid pressure operated actuator which moves a selector member in a first direction to engage one of a number of ratio shift rails, a second fluid pressure operated actuator which moves the selector member in a second direction to longitudinally displace the engaged shift rail to engage an associated selected ratio, and a valve member which acts against a bias force which is varied in dependence on the position of the first actuator to control the level of pressure supplied to the second actuator.
A ratio selector mechanism for the selection of the operative ratio in a associated synchromesh vehicle transmission in which fluid pressure operated actuating means operates synchromesh units, said mechanism including a first fluid pressure operated actuator which moves a selector member in a first direction to engage one of a number of ratio shift rails, a second fluid pressure operated actuator which moves the selector member in a second direction to longitudinally displace the engaged shift rail to engage an associated selected ratio, fluid pressure being supplied to said first and second actuators via a solenoid operating master control valve which operates as a proportional flow valve and in that a pressure transducer is provided which senses the pressure level supplied to said first and second actuators and whose output is fed to an electronic control means which issues signals to the solenoid of the master control valve to control fluid pressure to the first and second actuators in accordance with predetermined transmission or vehicle operating criteria.
Dependencies are inferred from the claim text.