JPS5591460A - Car steering mechanism - Google Patents

Abstract

PURPOSE: To prevent the right and the left clutch from releasing by providing switching valves between operational control valves and steering-clutch releasing pistons, thereby to avoid the operation of two pistons caused by the simultaneous operation of two control valves.

CONSTITUTION: When steering members to the right and the left are simultaneously operated, oil pressures are given, on the one hand, to the upper face 53 of a spool valve 38 from a port 24 of the right cylinder through an oil route 14, ports 16 and 18 of a valve 9, and an oil route 32, and to the under face 57 of a spool valve 56 of the left cylinder 27 through an oil route 35, and on the other hand, to the upper face 58 of the spool valve 56 of the left cylinder 27 and to the under face 60 of the spool valve 38 of the right cylinder 23, from an oil route 33 through an oil route 15, ports 17 and 19 of a valve 10, and an oil route 34. Since these pressures are equalized, spool valves 38 and 56 are given upward pressures by virtue of areal differences between their respective upper and under faces, and the right and the left steering clutch are prevented from releasing.

COPYRIGHT: (C)1980,JPO&Japio