HYDRAULIC CONTROL DEVICE OF CONTINUOUSLY VARIABLE TRANSMISSION

• Main Authors: NAGASATO YU, YANAGIDA TOMOAKI, MORINO TAKURO, ABE TOMOHIRO, KAWAKAMI TAKAO, OSADA TOMOE
• Format: Patent
• Language: English; Japanese
• Published: 24.08.2015
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To suppress the lowering of the durability of a secondary pulley when pulled.SOLUTION: A hydraulic control device of a continuously variable transmission comprises: an oil pump 51 which can be driven by using either of an output torque of a power source and a rotational torque of a drive wheel; a line pressure regulating valve 61 which outputs a regulated line pressure which is obtained by regulating the hydraulic pressure of working oil discharged by the oil pump 51 to an original pressure; and a belt holding pressure regulating valve 63 which outputs a regulated belt holding pressure which is obtained by regulating the line pressure outputted by the line pressure regulating valve 61 to the original pressure, and supplies the belt holding pressure to a working oil chamber of a secondary pulley 32; and a changeover valve 70 which is arranged on a route of the oil passage between the belt holding pressure regulating valve 63 and the working oil chamber, supplies the belt holding pressure to the working oil chamber at valve-opening, and blocks the supply of the belt holding pressure to the working oil chamber at valve-closing. The changeover valve 70 is valve-opened when the line pressure is higher than the belt holding pressure, and valve-closed when the line pressure is equal to the belt holding pressure. 【課題】被けん引時のセカンダリプーリの耐久性の低下を抑えること。【解決手段】動力源の出力トルクと駆動輪の回転トルクの内の何れか一方を用いて駆動することが可能なオイルポンプ５１と、オイルポンプ５１の吐出した作動油の油圧を元圧にして調圧したライン圧を出力するライン圧調圧弁６１と、ライン圧調圧弁６１の出力したライン圧を元圧にして調圧したベルト挟圧を出力し、このベルト挟圧をセカンダリプーリ３２の作動油室に供給するベルト挟圧調圧弁６３と、ベルト挟圧調圧弁６３と作動油室との間の油路の経路上に配置し、開弁時にベルト挟圧を作動油室に供給する一方、閉弁時にベルト挟圧の作動油室への供給を遮断する切替弁７０と、を備え、切替弁７０は、ライン圧がベルト挟圧よりも高いときに開弁し、ライン圧とベルト挟圧とが同じ圧力のときに閉弁するように構成すること。【選択図】図２