question about rotor gears

Deividas · 02-14-2016, 06:17 AM

Hello, i'm novice at rotary engines and new member at this forum

I'm interested in these engines, and wanna ask question about stationary and rotor gears. All info, that i can find, says, that these gears ensures the rotor moves exactly 1/3 turn for each turn of the eccentric shaft, but then how rotor can move differently, if there would be no gears? Can it move more or less than 1/3 turn for each turn of the eccentric shaft? Sorry if question is dumb, but i'm novice and i like to know

P.S. sorry for my english, it's not my native language

Slides · 03-24-2016, 04:52 AM

You need the gears to constrain its motion or it would just crash the lobes of the rotor into the housing at random. It needs to be phased rotation to allow it to contain the different cycles or "strokes" too.

Pete_89T2 · 03-24-2016, 10:20 AM

^What he said, but to clarify a bit, the gear ratio is tied directly to rotor/housing geometry. So for the Mazda design, which is a 3 sided rotor, it has to be a 1:3 ratio - rotor turns 1/3 for every full revolution of the E-shaft to complete a 4 stroke Otto cycle of a internal combustion engine with a 3 sided rotor.

So for example if you designed a rotary engine with a 4 sided rotor and appropriate housing geometry to suit, the ratio would be 1:4 and so on.

02-14-2016, 06:17 AM	#1
Deividas The Newbie Join Date: Feb 2016 iTrader: (0) Posts: 1 Rep Power: 0	question about rotor gears Hello, i'm novice at rotary engines and new member at this forum I'm interested in these engines, and wanna ask question about stationary and rotor gears. All info, that i can find, says, that these gears ensures the rotor moves exactly 1/3 turn for each turn of the eccentric shaft, but then how rotor can move differently, if there would be no gears? Can it move more or less than 1/3 turn for each turn of the eccentric shaft? Sorry if question is dumb, but i'm novice and i like to know P.S. sorry for my english, it's not my native language

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03-24-2016, 04:52 AM	#2
Slides Rotary Fan in Training Join Date: Apr 2012 Location: NSW, Australia iTrader: (0) Posts: 39 Rep Power: 0	You need the gears to constrain its motion or it would just crash the lobes of the rotor into the housing at random. It needs to be phased rotation to allow it to contain the different cycles or "strokes" too.

03-24-2016, 10:20 AM	#3
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD iTrader: (1) Posts: 874 Rep Power: 15	^What he said, but to clarify a bit, the gear ratio is tied directly to rotor/housing geometry. So for the Mazda design, which is a 3 sided rotor, it has to be a 1:3 ratio - rotor turns 1/3 for every full revolution of the E-shaft to complete a 4 stroke Otto cycle of a internal combustion engine with a 3 sided rotor. So for example if you designed a rotary engine with a 4 sided rotor and appropriate housing geometry to suit, the ratio would be 1:4 and so on.