Bearing
Gudomlig sporthojare
Artikel på sae.org med citat från Masao Furusawa, Executive Officer of Yamaha Motor Co.
http://www.sae.org/mags/AEI/5586
Crossplane-/"Big Bang"-vevaxeln ger, jämfört med den konventionella vevaxeln med 180°-intervall, motorn jämnare rotationshastighet vid höga varvtal. Anledningen till att varvtiderna blir lägre är alltså den jämna gången, vilket går stick i stäv med den populära teorin om Big Bang - att däcket "sladdar-återhämtar sig-sladdar-återhämtar sig". Den ultima motorn har helt jämn gång, t.ex. elmotorn, enligt Furusawa.
Från artikeln:
“
"Some maintain that closely spaced, multicylinder combustion pulses press the driving tire’s contact patch against the road surface harder, to a degree that the tire slips or spins, then enables the tire’s ‘recovery’ during the following non-combustion interval, so that pent up energy generates a stronger grip on the next power pulse—a rather dubious supposition that I do not subscribe to at all," he continued.
Furusawa observed that, by simultaneous two-cylinder combustions, peak torque would double, producing a momentary burst of power, but conversely the total number of combustions decreases, thus obtaining the same total.
His ideal would have been a multicylinder, even-interval-firing engine with minimum fluctuations in revolutions, thereby getting the maximum amount of propulsion without inducing tire slippage. Ultimately, he added, something like an electric motor.
He said that uneven-interval firing itself was not the primary purpose of his design and development team, but that the 90° crankshaft was a fruit of strenuous work in minimizing fluctuations in engine revolutions. The natural result was that combustion intervals had become uneven because of the crankshaft design.
”
http://www.sae.org/mags/AEI/5586
Crossplane-/"Big Bang"-vevaxeln ger, jämfört med den konventionella vevaxeln med 180°-intervall, motorn jämnare rotationshastighet vid höga varvtal. Anledningen till att varvtiderna blir lägre är alltså den jämna gången, vilket går stick i stäv med den populära teorin om Big Bang - att däcket "sladdar-återhämtar sig-sladdar-återhämtar sig". Den ultima motorn har helt jämn gång, t.ex. elmotorn, enligt Furusawa.
Från artikeln:
“
"Some maintain that closely spaced, multicylinder combustion pulses press the driving tire’s contact patch against the road surface harder, to a degree that the tire slips or spins, then enables the tire’s ‘recovery’ during the following non-combustion interval, so that pent up energy generates a stronger grip on the next power pulse—a rather dubious supposition that I do not subscribe to at all," he continued.
Furusawa observed that, by simultaneous two-cylinder combustions, peak torque would double, producing a momentary burst of power, but conversely the total number of combustions decreases, thus obtaining the same total.
His ideal would have been a multicylinder, even-interval-firing engine with minimum fluctuations in revolutions, thereby getting the maximum amount of propulsion without inducing tire slippage. Ultimately, he added, something like an electric motor.
He said that uneven-interval firing itself was not the primary purpose of his design and development team, but that the 90° crankshaft was a fruit of strenuous work in minimizing fluctuations in engine revolutions. The natural result was that combustion intervals had become uneven because of the crankshaft design.
”
