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  1. factsb4pride

    Geared Crankshafts in IC engines

    Thank you all.
  2. factsb4pride

    Geared Crankshafts in IC engines

    As things are now, I am planning to utilize a ring gear/pinion pair that is 1/2 the pinion pitch diameter in width. That will hopefully be robust enough to withstand the combustion forces involved. I am planning to mount the ring gears with double split pins to mitigate peak combustion loads...
  3. factsb4pride

    Geared Crankshafts in IC engines

    Well, the rotary engine paper Terry posted led me astray slightly. The "spring pins" used to mount rotor ring gears in rotary engines are really ordinary split pins, but with double pins, one inside the other. So ordinary split pins can be used for this application. I am curious/hopeful this...
  4. factsb4pride

    Geared Crankshafts in IC engines

    Here is what I am referring to: http://www.google.com/patents?id=hwYCAAAAEBAJ&printsec=abstract&zoom=4&source=gbs_overview_r&cad=0#v=onepage&q&f=false Question is, could this method be used in a cardan style crank to mount the gears? The pins work by displacing very slightly as they absorb...
  5. factsb4pride

    Geared Crankshafts in IC engines

    No, that is not what they had illustrated in the book. More like a center pin, with 4 equally spaced, spring loaded side-pieces mounted at the base of the pin.
  6. factsb4pride

    Geared Crankshafts in IC engines

    Okay, I found Terry's rotary engine reference online, and checked it out. The show the rotary engine stationary gear as being able to take up to 930kg of tangential gear tooth pressure in cases where only trailing sparkplugs are utilized. They also mention the use of "spring pins" to mount the...
  7. factsb4pride

    Geared Crankshafts in IC engines

    Something else that occurred to me: the drive gear in rotary engines absorbs combustion pulses directly, as we have already mentioned in this thread. Does anyone have any numbers on the dynamic combustion loads created by a rotary engine on its rotor drive gear? I will be tracking down the...
  8. factsb4pride

    Geared Crankshafts in IC engines

    Hey Terry, With regard to the engine you mentioned you had worked on: did it have a spring loaded "basket" or gear from the engine to the tranny? Like the neander motor does? Can you give any more details on that particular engine configuration? If anyone has any example of engine directly...
  9. factsb4pride

    Geared Crankshafts in IC engines

    Brian, I am not disputing the ability of the springs in the clutch basket to absorb/smooth out instantaneous forces. I see the points you have made, and my pre-superbowl brain is rolling this all around. Although I never suggested a vibration damper should be between the piston and gear in a...
  10. factsb4pride

    Geared Crankshafts in IC engines

    My last post was confusing, as your initial statement I referred to was directed at a typical motorcycle setup, and I took it to refer to the cardan setup. Sorry if I went awry there. I am also wondering about the role played by hydrodynamic bearings in absorbing at least part of the...
  11. factsb4pride

    Geared Crankshafts in IC engines

    No, I got that point, but the research I have read completely disagrees with your statement that only torque loads are experienced by the gear teeth involved in the mesh in this application. Instantaneous combustion loads ARE experienced by the gear teeth, according to my sources. Please refer...
  12. factsb4pride

    Geared Crankshafts in IC engines

    I understand the that most clutch systems have the ability to absorb and even out combustion pulses in most engines. That being the case, does that reduce the bending loads on gear teeth in that configuration? My research shows that gear teeth contact forces are manageable in this application...
  13. factsb4pride

    Geared Crankshafts in IC engines

    @Brian Peterson: What you say about the crank gears is true except for the gear(s) engaged with the tranny input gear(s). Those crank gears MUST pass all of the forces generated by the engine through their mesh with the tranny input gear(s). This confused me at first as well, but if ANY of the...
  14. factsb4pride

    Geared Crankshafts in IC engines

    Here is another cutaway view of the Neander motor. Not possible to discern all the details from it however. http://files.engineering.com/getfile.aspx?folder=70f96c1a-cbeb-413b-8deb-40fceba89eb4&file=m04-06-13.jpg
  15. factsb4pride

    Geared Crankshafts in IC engines

    Could be its just for illustration, and they don't care to show what their methodology is in that kind of detail. Or maybe there is another input gear on the other side of the engine that is not shown in that view. Good eye though! From my research, and as you pointed out, face width of the...
  16. factsb4pride

    Geared Crankshafts in IC engines

    Terry, I found the internal ring gear & pinion formula for calculating contact ratio a second ago.
  17. factsb4pride

    Geared Crankshafts in IC engines

    Oops, forgot to point out that the gears in the Neander motor are SPUR gears, yet no mention of excessive gear noise is mentioned in any review I have read of the Neander Motorcycle. That is amazing, and very welcome news.
  18. factsb4pride

    Geared Crankshafts in IC engines

    Hey Terry, Appreciate your post! The setup you describe almost sounds like the research Achates has been engaged in. I am intrigued by your report of using case hardened gears with involute tooth profiles in an engine application as we have been discussing. That is the kind of info I am looking...
  19. factsb4pride

    double-circular-arc gear generator software

    I am still looking for some software that will produce various forms of circular arc gears, that I can subsequently import into solidworks. @mfgenggear: no offense, but I am having trouble discerning your comments. The accuracy requirement on my end is whatever will work in the chosen...
  20. factsb4pride

    Geared Crankshafts in IC engines

    Sorry about the extended delay in posting, but I have been waiting to hear back from Neander Motors. While they did not reveal any details, which is understandable, they DID say that the large gears on their engine cranks DO in fact engage directly with gears in the tranny. So that means they...

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