Crankshaft end structure of internal combustion engine

Abstract

PURPOSE: To prevent leakage of lubricating oil travelling along a crankshaft with a flange at a protruded edge to the exterior part effectively by means of a non-contact type enclosing structure and for a long time. CONSTITUTION: The first stepped part 6 of large diameter and the second stepped part 7 of small diameter connected thereto in the direction of the shaft end are formed to the end part of a crankshaft 2 protruded from a frame edge surface 1a. An annular labyrinth groove 19 opposite to the first stepped part 7, and an annular oil groove 24 connected thereto in the direction of the shaft end are formed to the end of the crankshaft 2. A U-shaped communicating oil passage 25 one end 25a of which opens to the oil groove 24, and other end 25b of which opens to a crank chamber 18 on the outside in the radial direction of this opening is provided. COPYRIGHT: (C)1992,JPO&Japio

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    Publication numberPublication dateAssigneeTitle
    JP-2013079630-AMay 02, 2013Daihatsu Diesel Mfg Co Ltd, ダイハツディーゼル株式会社クランク軸端のシール構造