Patent ID: 8955646
Filing Date: 2015-02-17
Classification: F01M

Abstract:
1. An arrangement for lubricating an oil seal of an engine, said arrangement comprising: a gear case for covering an engine gear room where timing gears are arranged; a crankcase located on a side facing the gear case across the engine gear room; an oil seal fixed in an inner circumference of the gear case and configured to seal the engine gear room by extending between the gear case and a side face of a disk plate fixed to an end of a crankshaft, the oil seal having a slide contacting part located on a side of the gear case across the engine gear room from the crankcase; a roof-shaped nozzle member detachably attached to an end face of the crankcase and facing the gear case across the engine gear room; an oil injection hole disposed in the roof-shaped nozzle member such that an oil jet stream injected from the oil injection hole is directed to the slide contacting part of the oil seal located on a side of the gear case across the engine gear room; and an oil well that is a recess at the end face of the crankcase and has an opening covered with the roof-shaped nozzle member; wherein the oil well communicates with a main oil gallery in the crankcase via an oil passageway so that a pressurized oil from the main oil gallery is capable of being injected as the oil jet stream from the oil injection hole via the oil passageway and the oil well to the slide contacting part of the oil seal located on the side of the gear case, the oil well being formed by a space on a back side of the roof-shaped nozzle member, the space having an area larger than a cross-sectional area of the oil passageway.