Desmodromic Valve Control 2
This historic picture is very similar to the construction, explained on the last page. Let us first of all clarify the type of motor, a motorcycle engine V2 (90°). It
is installed transversely in such a way that one cylinder leans against the wind and the other by upright position will get enough of it, too. However, while liquid
cooled the low center of gravity for the front cylinder is perhaps more important.
We want to see on the valve control, how far the Desmodromic can adapt modern requirements. First, the chain-controlled version, in which each of the two
camshafts is driven via the connecting intermediate gear wheel. There are 90° rocker arms, one for opening and one for closing of each valve. Each rocker
arm has its own short shaft and a spring which keeps it under tension.
For varying the control times e.g. depending on the engine speed, the next arrangement is more favorable. Here a toothed belt per cylinder drives both
wheels of the camshafts. This opens the way to incorporate a suitable hydraulic in this, which allows separate adjustment of inlet and outlet camshaft.
Below one of the drive wheels is closed and shown as being open for a look at its inner working. It is no surprise, because here, as in the car engine, by oil
hydraulic twisting of the camshaft relative to its drive is possible. 05/16
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