How many intermediate driving gears ?
How many intermediate driving gears ?
(OP)
I'am a little unsure on how many intermediate driving gears (idlers) there are in this valve train system and would like to know others thoughts?
the main driving is through a chain and then one cam drives the other with gears on the cams.
the main driving is through a chain and then one cam drives the other with gears on the cams.





RE: How many intermediate driving gears ?
RE: How many intermediate driving gears ?
RE: How many intermediate driving gears ?
RE: How many intermediate driving gears ?
another day in paradise, or is paradise one day closer ?
RE: How many intermediate driving gears ?
That system was used on different Toyota engines like the 5S-FE and 4A-FE:
RE: How many intermediate driving gears ?
1. Valve timing system drive must be by one chain. An intermediate drive gear which rotates on only one axle or rotation centre is allowed in the system (refer to Diagram 7 in the Appendix for some examples of permitted systems).
I thought the proposed system would be good because the head is desmodromic and reducing the chain lengths will reduces the chance of timing misalignment from chain wear and reduce the need for chain replacement and reduce chain whip (I think this would be a good choice for a racing engine as long as i can get the intermediate gear light enough). the cam gears would look the same as this buell 1125r
RE: How many intermediate driving gears ?
RE: How many intermediate driving gears ?
RE: How many intermediate driving gears ?
RE: How many intermediate driving gears ?
I don't care about nomenclature as long as it works!
RE: How many intermediate driving gears ?
I don't see any idler gears in your diagram, to me an idler gear is defined as at this link
http://en.m.wikipedia.org/wiki/Idler-wheel
RE: How many intermediate driving gears ?
I agree Desertfox, but it still seems like a bit on a grey area, thanks for your input.
RE: How many intermediate driving gears ?
Probably 99% of DOHC cam drives use a single belt or chain around the crank sprocket and the independent sprockets for each camshaft. No gears involved. There may be various idlers or other pulleys that drive other accessories or serve as tensioning rollers.
Some Toyota engines are as shown above, with belt/chain to one camshaft and then gears to the other one (which now must rotate in the opposite direction). It allows the camshafts to be closer together, e.g. to allow tighter valve angles (valves set closer to vertical).
Some motorcycle engines use an intermediate shaft with the camshafts driven in turn (by various means) from that. The mention of desmodromic valve operation suggests Ducati. Right/wrong?
RE: How many intermediate driving gears ?
Do the rules specifically say gears, and only gears? The components that drive, and are driven by, chains and toothed belts are really sprockets.
RE: How many intermediate driving gears ?