ODD-CYLINDER V-TYPE INTERNAL COMBUSTION ENTINE

Title:

ODD-CYLINDER V-TYPE INTERNAL COMBUSTION ENTINE

Document Type and Number:

WIPO Patent Application WO/2002/055853

Kind Code:

A1

Abstract:

A V-type internal combustion engine, having (2n+1) (n; natural number) cylinders, is provided with a crank shaft having n common crank pins K¿c? to which a pair of pistons in two banks are both connected and one stand-alone crank pin to which the remaining one piston only is connected. The common crank pins K¿c? are arranged at an equal phase, with a bank angle $g(U) set to satisfy the expression $g(U)= cos?-1¿(1/(2n)). The stand-alone crank pin is disposed, when the remaining piston belongs to a bank on an advance side in a crank shaft rotation direction, on a lag side in a crank shaft rotation direction with an angle of (180-$g(U)) degrees away from a common crank pin K¿c?, the masses M of reciprocating-motion portions such as pistons in all cylinders are set equal, and the crank shaft is provided with a balance weight W¿B? that generates a balancing force having a magnitude of kMr$g(v)?2¿ in a ($g(a)+180)-degree direction, when k = $m(R){[1/2$m(R)(1-1/4n?2¿)]?2¿ + (n-1/4n)?2¿} $g(a)=sin?-1¿[1/2$m(R)(1-1/4n?2¿)/k], where $g(a): rotation-direction angle from common crank pin K¿c? M: mass of each reciprocating-motion portion r: crank radius $g(v): angular speed of crank shaft. Accordingly, an odd-cylinder V-type internal combustion engine is provided that prevents a primary vibration generation to be caused by a primary inertia force without increases in weight and size of the internal combustion engine.

Inventors:

YAMASHITA NOBORU (JP)

Application Number:

PCT/JP2001/010925

Publication Date:

July 18, 2002

Filing Date:

December 13, 2001

Export Citation:

Click for automatic bibliography generation Help

Assignee:

HONDA MOTOR CO LTD (JP)
YAMASHITA NOBORU (JP)

International Classes:

F02B77/00; F02B61/02; F02B75/22; F16F15/24; F16F15/26; F16F15/28; F02B75/02; F02B75/18; (IPC1-7): F02B77/00; F16F15/24

Foreign References:

JPH08226493A	1996-09-03
JPS6148628A	1986-03-10
JPS6065935A	1985-04-15

Other References: