Patent ID: 7270224
Filing Date: 2007-09-18
Classification: B63H,F15B,F16D,F16H

Abstract:
1. A device for the optimization of hydraulically controlled engagement of marine transmission clutches comprising a pump ( 10 ) for delivery of hydraulic fluid from a reservoir ( 11 ) to two control pistons ( 12 a , 12 b ) of said clutches, two solenoid valves ( 13 , 14 ) arranged between said pump ( 10 ) and said pistons ( 12 a , 12 b ) with a first output of each solenoid valve ( 13 , 14 ) being connected to an input of a corresponding one of the two control pistons ( 12 a , 12 b ) bistable valve ( 15 ) having first and second ports with each of the first and second ports being connected to a corresponding one of the first outputs of the solenoid valves ( 13 , 14 ), a control valve ( 16 ) arranged on a pressure side of said pump ( 10 ) toward a discharge line leading to the reservoir ( 11 ) and equipped with an adjusting device ( 17 ), comprising a spring element ( 18 ) that is linked to said bistable valve ( 15 ), the optimization device further comprising a shuttle-type sequence valve ( 19 ) on a link between the spring element ( 18 ) of said adjusting device ( 17 ) and one of a supply line of said solenoid valves ( 13 , 14 ) or said bistable valve ( 15 ), the bistable valve ( 15 ) is also linked to a hydraulic control ( 20 ) of said sequence valve ( 19 ), said adjusting device ( 17 ) is linked to the pressure side of said pump ( 10 ), and a valve ( 21 ) arranged in a selected section of the link ( 22 ) between said sequence valve ( 19 ) and said bistable valve ( 15 ) or the link ( 23 ) between the sequence valve ( 19 ) and said spring element ( 18 ) of said adjusting device ( 17 ), a function of this valve ( 21 ) is to produce a preset pressure drop between the spring element ( 18 ) of said adjusting device ( 17 ) and the bistable valve ( 15 ).