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OwnerKuninori Ito, Nobuaki Satoinventors
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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)=Fm[1 1 . . . 1][exp(im·α1)exp(im·α2) . . . exp(im·αn)]t=Fm·gm and |gm| is an absolute value of a non-dimensional coefficient of F(m) and is represented by; |gm|=abs{[1 1 . . . 1][exp(im·α1)exp(im·α2) . . . exp(im·αn)]t}; a restrictive condition is set in which |gm|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)=FkL[s1 s2 . . . sn][exp(ik·α1)exp(ik·α2) . . . exp(ik·αn)]t=FkL·fk and |fk| 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; |fk|=abs{[s1 s2 . . . sn][exp(ik·α1)exp(ik·α2) . . . exp(ik·αn)]t}; an angle of the crank throw arrangement αj (j=1, 2, . . . , n.) is obtained to be determined by an expression on an orthogonal coordinate system, the angle of the crank throw arrangement αj minimizing, under the restrictive condition, the n-th power of |fk|, n being an even number.
A method for determining an angle of a crank arrangement in a multi-cylinder reciprocating internal combustion engine, comprising the steps of:
A method for determining an angle of a crank arrangement in a multi-cylinder reciprocating internal combustion engine, comprising the steps of:
A 4-stroke cycle in-line type 7 cylinder or V-type 14 cylinder internal combustion engine, wherein, where a crank throw of a front end or a rear end of a crank shaft is defined a reference crank throw, angles of the crank throw arrangement of other crank throws relative to the reference crank throw are set to +100.26°±1°, −166.09°±0.5°, −112.16°±0.5°, −72.98°±0.5°, +132.89°±0.5° and +23.96°±0.5° in the order counted from the reference crank throw, provided that the total of the deviations shown by ± relative to each of said angles shall be zero.
A 4-stroke cycle in-line type 7 cylinder or V-type 14 cylinder internal combustion engine, wherein, where a crank throw of a front end or a rear end of a crank shaft is defined a reference crank throw, angles of the crank throw arrangement of other crank throws relative to the reference crank throw are set to +99.52°±0.5°, −154.44°±0.5°, −96.46°±0.5°, +166.30°±0.5°, −44.28°±0.5° and +64.18°±0.5° in the order counted from the reference crank throw, provided that the total of the deviations shown by ± relative to each of said angles shall be zero.
A 4-stroke cycle in-line type 9 cylinder or V-type 18 cylinder internal combustion engine, wherein, where a crank throw of a front end or a rear end of a crank shaft is defined a reference crank throw, angles of the crank throw arrangement of other crank throws relative to the reference crank throw are set to +119.71°±0.5°, −158.45°±0.5°, −118.35°±0.5°, +83.19°±0.5°, −78.36°±0.5°, −36.42°±0.5°, +42.67°±0.5° and +163.67°±0.5° in the order counted from the reference crank throw, provided that the total of the deviations shown by ± relative to each of said angles shall be zero.
A 4-stroke cycle in-line type 9 cylinder or V-type 18 cylinder internal combustion engine, wherein, where a crank throw of a front end or a rear end of a crank shaft is defined a reference crank throw, angles of the crank throw arrangement of other crank throws relative to the reference crank throw are set to +80.87°±2°, −80.73°±2°, +154.77°±2°, −155.08°±2°, −123.36°±2°, +121.73°±2°, −39.13°±2° and +37.62°±2° in the order counted from the reference crank throw, provided that the total of the deviations shown by ± relative to each of said angles shall be zero.
A 4-stroke cycle in-line type 9 cylinder or V-type 18 cylinder internal combustion engine, wherein, where a crank throw of a front end or a rear end of a crank shaft is defined a reference crank throw, angles of the crank throw arrangement of other crank throws relative to the reference crank throw are set to −117.69°±3°, +82.24°±3°, +163.15°±3°, +126.45°±3°, −74.85°±3, −31.61°±3°, −152.00°±3° and +49.40°±3° in the order counted from the reference crank throw, provided that the total of the deviations shown by ± relative to each of said angles shall be zero.
A 4-stroke cycle in-line type 9 cylinder or V-type 18 cylinder internal combustion engine, wherein, where a crank throw of a front end or a rear end of a crank shaft is defined a reference crank throw, angles of the crank throw arrangement of other crank throws relative to the reference crank throw are set to −117.16°±0.5°, +83.11°±0.5°, +165.20°±0.5°, +120.44°±0.5°, −77.68°±0.5°, −35.46°±0.5°, −158.64°±0.5° and +44.46°±0.5° in the order counted from the reference crank throw, provided that the total of the deviations shown by ± relative to each of said angles shall be zero.
A 2-stroke cycle in-line type 8 cylinder internal combustion engine, wherein, where a crank throw of a front end or a rear end of a crank shaft is defined a reference crank throw, the angles of the crank throw arrangement of other crank throws relative to the reference crank throw are set to −144.71°±0.5°, +92.74°±0.5°, +129.03°±0.5°, −84.22°±0.5°, −47.94°±0.5°, −170.49°±0.5° and +44.81°±0.5° in the order counted from the reference crank throw, provided that the total of the deviations shown by ±relative to each of said angles shall be zero.
A 2-stroke cycle in-line type 8 cylinder internal combustion engine, wherein, where a crank throw of a front end or a rear end of a crank shaft is defined a reference crank throw, the angles of the crank throw arrangement of other crank throws relative to the reference crank throw are set to +87.67°±0.5°, −95.70°±0.5°, +172.35°±0.5°, −132.50°±0.5°, +135.55°±0.5°, −47.82°±0.5° and +39.85°±0.5° in the order counted from the reference crank throw, provided that the total of the deviations shown by ± relative to each of said angles shall be zero.
A 2-stroke cycle in-line type 8 cylinder internal combustion engine, wherein, where a crank throw of a front end or a rear end of a crank shaft is defined a reference crank throw, the angles of the crank throw arrangement of other crank throws relative to the reference crank throw are set to +92.80°±0.5°, −140.66°±0.5°, −83.55°±0.5°, +133.09°±0.5°, −169.79°±0.5°, −43.25°±0.5° and +49.54°±0.5° in the order counted from the reference crank throw, provided that the total of the deviations shown by ± relative to each of said angles shall be zero.
Dependencies are inferred from the claim text.