摘要:
A tilt cylinder for tilting an outboard engine has first and second cylinder chambers. A pair of on/off valves is movably disposed in respective fluid passages connected to a hydraulic pump and the first and second cylinder chambers, respectively. The on/off valves are operatively combined with respective shuttle valves which have respective oil passages in facing relationship to the on/off valves, respectively, and respective ball valve bodies for selectively opening the oil passage into communication with each other. When the hydraulic pump is actuated to develop a working oil pressure buildup, one of the on/off valves is opened by the working oil pressure buildup to establish an oil supply passage from the hydraulic pump to one of the first and second chambers, and the other of the on/off valves is opened by the coacting shuttle valve which is moved by the working oil pressure buildup to establish an oil return passage from the other of the first and second chambers to the hydraulic pump. The shuttle valves have respective auxiliary passages communicating with the oil passages, respectively, and the oil supply and return passages, respectively.
摘要:
A spool valve includes a spool assembly axially movably disposed in a cylindrical valve case. The spool assembly comprises a guide sleeve threaded in an end portion of the valve case and having an inner end positioned in the valve case and an outer end positioned outside of the valve case, and a spool axially slidably extending through an opposite end portion of the valve case and the guide sleeve. The spool is centered with respect to the valve case by a self-centering mechanism which is retained in the guide sleeve and the spool by a stopper nut threaded in the inner end of the guide sleeve. A lock nut is threaded over the outer end of the guide sleeve for fastening the guide sleeve to the valve case.
摘要:
Novel monocyclic terpene derivative of the formula: ##STR1## wherein R is hydrogen atom, trimethylsilyl group or 1-ethoxyethyl group, and novel intermediate therefor. The terpene derivative (I) is a useful intermediate for preparing Sarcophytol A having an anti-carcinogenesis promoter activity and an antitumor activity.
摘要:
A tetrahydroisoquinoline derivative represented by formula: ##STR1## wherein R.sup.1 represents hydrogen or methyl and X.sup.1, X.sup.2, Y.sup.1 and Y.sup.2 are defined as follows:(1) X.sup.1 represents --OH, ##STR2## or OR.sup.2 wherein R.sup.2 represents lower alkyl when X.sup.2, Y.sup.1 and Y.sup.2 represent hydrogen(2) X.sup.1 and X.sup.2 together form oxo (.dbd.O), when Y.sup.1 and Y.sup.2 represent hydrogen or(3) Y.sup.1 and Y.sup.2 together form oxo (.dbd.O), when X.sup.1 and X.sup.2 represent hydrogen which is useful as an intermediate in preparation of Cotarnine.