SWASH PLATE-TYPE HYDRAULIC ACTUATION APPARATUS AND HYDROSTATIC CONTINUOUSLY VARIABLE TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To provide a distributing valve of a swash plate type hydraulic actuation apparatus, capable of reducing the size of a cylinder block, decreasing machining man-hour and decreasing the number of part items. SOLUTION: The distributing valve is adapted to alternately switch between communication and interruption of a communicating passage 65A connected to an oil chamber 61 and opened to the inner surface of a cylinder bore 15 and low pressure and high pressure ports 66A, 67A connected to a low pressure oil passage 11A and a high pressure oil passage 12A and opened to the inner surface of the cylinder bore 16 according to the axial reciprocating movement of a plunger 17.