PURPOSE: To contrive reduction of the initial charging time, from a clutch off- condition to a clutch meet condition, and suppression of a rapid increase of clutch operating pressure, at the time of clutch meet, by connecting an accumulator to an oil pressure part of a pressure oil supply path between a switching valve and a boost control valve.
CONSTITUTION: An accumulator 17, having a capacity almost equal to an oil chamber 16 of a hydraulic clutch B, is connected to an oil path part 8a of a pressure oil supply path 8 between a switching valve 9 and a boost control mechanism. Since this accumulator 17 is placed in a condition that a pressure is always applied through the boost control mechanism F even after setting to a pressure oil supply upper side of the switching valve 9, oil is accumulated. When the switching valve 9 is operated to a clutch-connection side, the accumulated oil is allowed to flow in a side of the hydraulic clutch B because the accumulator 17 communicates with the oil chamber 16 of the hydraulic clutch B, and the clutch meets by performing the initial pressure oil charge without generating a rapid increase of clutch pressure.
OKAMOTO MUNEHARU
NAKAMURA MASAYUKI
HATTORI AKIO
KUBOTA SEIKI KK