Crank shaft support assembly

Details Crank shaft support assembly Crank shaft support assembly

2007-10-23

2007-10-23

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Frame construction

Horizontal cylinder

C123S1950AC, C029S888010

Reexamination Certificate

active

11373544

ABSTRACT:
A crank shaft support assembly for increasing stiffness and reducing thermal mismatch distortion in a crank shaft bore of an engine comprising different materials. A cylinder block comprises a first material and at least two crank journal inserts are insert-molded into respective crank journal regions of the cylinder block and comprise a second material having greater stiffness and a lower thermal coefficient of expansion that the first material. At least two bearing caps are bolted to the respective crank journal inserts and define, along with the crank journal inserts, at least two crank shaft support rings defining a crank shaft bore coaxially aligned with a crank shaft axis. The bearing caps comprise a material having higher stiffness and a lower thermal coefficient of expansion than the first material and are supported on the respective crank journal inserts independently of any direct connection to the cylinder block.

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