{
  "$type": "site.standard.document",
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  "description": "In a multi-cylinder reciprocating internal combustion engine, an optimal angle of crank arrangement that reduces vibrating force caused in the engine is obtained. Where Fm is the sum of an unbalanced force of order m that acts as vibrating force in the multi-cylinder reciprocating internal…",
  "path": "/patents/1094244",
  "publishedAt": "2003-08-06T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02B75/06",
    "MITSUBISHI HEAVY IND LTD [JP]"
  ],
  "textContent": "In a multi-cylinder reciprocating internal combustion engine, an optimal angle of crank arrangement that reduces vibrating force caused in the engine is obtained. Where Fm is the sum of an unbalanced force of order m that acts as vibrating force in the multi-cylinder reciprocating internal combustion engine (having the number of crank throws of n) and is represented by; F(m)=FmÄ1 1 ... 1ÜÄexp(im• alpha 1)exp(im• alpha 2) ... exp(im• alpha n)Ü =Fm•gm and ¾gm¾ is an absolute value of a non-dimensional coefficient of F(m) and is represented by; ¾gm¾=absäÄ1 1... 1Ü Äexp(im• alpha 1) exp(im• alpha 2) ... exp(im• alpha n)Üü; a restrictive condition is set in which ¾gm¾ is endlessly approached to zero, and where M(k) is an unbalanced couple that is expressed by the unbalanced force of order k of each crank throw, weighted by distance L between each cylinder, and is represented by; M(k)=FkLÄs1 s2 ... snÜÄexp(ik• alpha 1) exp(ik• alpha 2) ... exp(ik• alpha n)Ü = FkL• fk and ¾fk¾ is an absolute value of a non-dimensional coefficient of the unbalanced couple, that is obtained by M(k) being divided by FkL, and is represented by; ¾fk¾=abs äÄs1 s2 ... snÜÄexp(ik• alpha 1) exp(ik• alpha 2) ... exp(ik• alpha n)Üü ; an angle of the crank throw arrangement alpha j (j= 1, 2, ... , n.) is obtained to be determined by an expression on an orthogonal coordinate system, the angle of the crank throw arrangement alpha j minimizing, under the restrictive condition, the n-th power of ¾fk¾, n being an even number.",
  "title": "Method for determining an angle of crank arrangement in a multi-cylinder internal combustion engine and a multi-cylinder internal combustion engine using this method"
}