Patent ID: 9644618
Date: 2017-05-09
CPC Classifications: B27B,F04B

Claim:
1. A portable working machine comprising: an oil pump which supplies oil from an oil tank to a movable member of a working tool by a rotation motion of a drive shaft of a power source, wherein: the oil pump includes: an oil groove, which communicably connects the pump chamber and the gear chamber when the pump shaft arrives at a predetermined rotation position, is formed in the pump case, the oil groove is formed at a location at which the oil groove is closed to the pump chamber together with the discharge passage and the oil groove does not communicably connect the pump chamber and the gear chamber when the oil is sucked through the suction passage to the pump chamber, and the oil groove is opened to the pump chamber together with the discharge passage and communicably connects the pump chamber and the gear chamber when the oil is discharged from the pump chamber to the discharge passage, when the oil is discharged from the pump chamber, a part of the oil flows from the pump chamber to the gear chamber through the oil groove, and the oil groove communicating with the gear chamber communicates with the pump chamber via a discharge port.