Offset crankshaft engine

Internal-combustion engines – Transmission mechanism from piston

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Details

1231974, 123 541, 123 544, 123 531, F02B 7532, F02B 7522

Patent

active

060589019

ABSTRACT:
The cylinders (12; 48, 50) are disposed such that each piston-cylinder axis (16; 56, 58) does not intersect the crankshaft axis (20; 47). Timing of combustion within each cylinder is controlled to cause maximum combustion pressure to occur when an imaginary plane that contains both a respective connection axis (28; 66, 70) of a respective connecting rod (24; 62, 64) to the respective piston (14; 52, 54) and a respective connection axis (30; 68, 72) of the connecting rod to a respective throw of the crankshaft is substantially coincident with the respective cylinder axis along which the piston reciprocates. In a V-type engine the axes of those cylinders in a respective bank are disposed in a respective imaginary plane (76; 78) forming a respective side of a V. The respective imaginary planes intersect along an imaginary line (74) that is parallel to the crankshaft axis and spaced from the crankshaft axis by a distance (A) substantially equal to the distance (A) by which the connection axis of each connecting rod to the respective throw is spaced from the crankshaft axis when the imaginary plane that contains both the respective connection axis to the respective piston and the respective connection axis to the respective throw is substantially coincident with the respective cylinder axis.

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JSAE Conference Proceedings 966, 2996-10.
Automotive Engineering, May 1991, "VW's narrow angle VR6 engine".

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