Patent ID: 9038593
Filing Date: 2015-05-26
Classification: F01M,F02B,F16J

Abstract:
1. A lubricating configuration in a two-stroke cycle engine in which a piston includes a bearing support structure with a bearing surface, and a wristpin fixed to the small end of a connecting rod, and the bearing support structure retains the wristpin for oscillation in the bearing surface, the lubricating configuration comprising: an internal oil reservoir in the wristpin in communication with one or more wristpin oil outlet passages operative to pass oil through the wristpin into an interface between the wristpin and the bearing surface; at least one oil pressure absorber disposed in the oil reservoir; a wristpin oil inlet passage in communication with the oil reservoir; an oil delivery passage in the connecting rod; and, a pressure-responsive control device coupling the oil delivery passage with the wristpin oil inlet passage; in which the pressure-responsive control device is oriented so as to open for passage of oil into the reservoir when oil pressure in the oil delivery passage exceeds the oil pressure in the oil reservoir and to close otherwise.