US 2007/0181091 A1Published application

Engine

AssigneeKubota Corporation

InventorsMasahiro Nagahama, Kozo Yoshida, Yoshihiko Kawamoto, Hiroshi Sasaki, Takashi Onishi, Mitsugu Okuda, Nobuyuki Kobayashi

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Abstract

An engine comprises a crank case (1) provided with a lower opening portion (2), which is covered with an oil pan (3) from below, and with a pair of left and right oil passages which extends in a front and rear direction along left and right lateral walls (5) and (6). In this engine, the crank case (1) has the left and right lateral walls (5) and (6) provided with left and right ribs (12) and (13) extending in the front and rear direction. These left and right ribs (12) and (13) are raised inwards from the left and right lateral walls (5) and (6) of the crank case (1). In order to provide left and right oil passages (7) and (8) in these left and right ribs (12) and (13), these ribs (12) and (13) are positioned at the lower opening portion (2) of the crank case (1).

Claims13

Dependent claims

An engine comprising:

a crank case (1) provided with a lower opening portion (2), the crank case being covered from below with an oil pan (3);
and
a crank shaft (4) positioned within the crank case and extending in front and rear directions, the crank case being provided with a pair of left and right oil passages (7) and (8) which respectively extend in the front and rear directions along left and right lateral walls (5) and (6) of the crank case (1);
wherein the left and right lateral walls (5) and (6) of the crank case (1) are provided with left and right ribs (12) and (13) which respectively extend in the front and rear directions, the left and right ribs being raised inwardly from the left and right lateral walls (5) and (6) of the crank case (1), the left and right ribs (12) and (13) being positioned at the lower opening portion (2) at a lower end of the crank case (1) and include therein, the left and right oil passages (7) and (8).

1 more element

Dependencies are inferred from the claim text.