Komatsu Corporation

Kenji Mihara

Yasuyuki Onodera

Fumihide Sato

Keisaku Iwakata

An oil seal () includes a first seal () for sealing an engine () side and a second seal () for sealing a flywheel () side. The first seal () is an axial seal abutted on an inner ring () from the direction along the axial direction of a crank shaft (). The second seal () is a radial seal abutted on the inner ring () from the direction along the radial direction of the crank shaft (). A communication hole () is provided on the second seal (), thereby preventing a space () surrounded by the first seal (), the second seal () and the inner ring () from the occurrence of the negative pressure.

Oil seal

An apparatus and method for predicting a lubricating oil replacement time for an engine by precisely predicting a total acid value and/or an amount of soot in a lubricating oil and by displaying an accurate time which will elapse before a required lubricating oil replacement. Accurate prediction of lubricating oil replacement prevents engine seizing and other damage and avoids wasteful replacement of otherwise useful lubricating oil.

Growing community of inventors

Oyama, Japan

Kenji Mihara