A New Vacuum-operated Governor
Page 47
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UNTIL recent years the centrifugal -governor was practically the only type employed on industrial-vehicle engines. With low-speed engines this form of regulator works well, but it is liable to interference by the driver.
On the modern high-speed petrol engine, however, the centrifugal governor is less satisfactory and various devices have been produced to cope with new conditions. Some of the new regulators are operated by the speed of the incoming gas stream and others by the vacuum existing in the induction pipe.
A good example of the latter type is the French F.L. regulateur-limiteur, made by Perrette FrAres, of Easy les Moulineux, Seine. This is a simple and compact little device which is interposed between the carburetter and the induction-pipe flange.
The arrangement ,comprises a butterfly throttle operated by means of a piston in the vacuum cylinder to be seen on the left in the accompanying sectional drawing. The movement of the vacuumpiston is compensated by the arrangement of springs to be seen on the right, the spring pressure being adjustable by means of a milled nut. The last-named is enclosed in a sealed cap, whilst all other moving parts are completely enclosed and proof against tampering by the driver. It may be noted that the spindle of the butterfly is mounted on ball bearings. An adjusting screw is fitted in the passage connecting the induction pipe with the vacuum cylinder, but this cannot be reached without taking off the casing of the appliance.