Cylinder block structure

Details Cylinder block structure Cylinder block structure

2006-07-18

2006-07-18

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Frame construction

Horizontal cylinder

Reexamination Certificate

active

07077095

ABSTRACT:
A cylinder block structure with a small number of ribs is provided which can favorably prevent the deformation of a crankshaft bearing portion. In a cylinder block having bolt holes formed on the upper surface for connecting a cylinder head with bolts, arcshaped coupling surfaces formed on the rear end surface for mounting a housing, such as a transmission housing, and a crankshaft bearing portion formed in the central part between the lower ends of the coupling surfaces, the upper parts of the coupling surfaces5are joined into an arch-shape by an arch-shaped rib, the lower ends of right and left bosses are extended and connected to the lower parts of the arch-shaped rib, and right and left main radial ribs extend from the outside of the lower end of the bolt hole boss to the center of the crankshaft bearing portion.

REFERENCES:
patent: 5009205 (1991-04-01), Abe et al.
patent: 5247915 (1993-09-01), Sasada et al.
patent: 2002/0062795 (2002-05-01), Ioue et al.
patent: 10218354 (2003-11-01), None
patent: 02102351 (1990-04-01), None
patent: 04017760 (1992-01-01), None
patent: 10205389 (1998-08-01), None
patent: 2000045863 (2000-02-01), None

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