Patent ID: 7481298

Claim:
A lubricating structure of a hydrostatic continuously variable transmission in which a hydraulic circuit comprised of a high pressure oil path for feeding working oil from a hydraulic pump to a hydraulic motor and a low pressure oil path for feeding working oil from said hydraulic motor to said hydraulic pump is constituted within a cylinder integrally formed with a transmission shaft between said hydraulic pump and said hydraulic motor within a casing rotated by a driving source, a clutch valve arranged in the transmission shaft is slid to make a shortened state between said high pressure oil path and said low pressure oil path so as to change over a transmittance of power force, the lubricating structure comprising: an oil path arranged at an outer circumferential side of said clutch valve; a lubricant oil ejection hole communicating with the oil path at the outer circumferential side of said clutch valve and formed in the transmission shaft toward the outer circumferential side of said transmission shaft; and a communicating oil path formed in the transmission shaft to cause an oil supplying path communicating with a lubricating oil supplying source to communicate with the oil path at the outer circumferential side of said clutch valve, wherein an orifice is arranged in said communicating oil path.