A patent design has the following CAD file for the throttle

A patent design has the following CAD file for the throttle value of an engine. Answer the following questions: What do you think this is for? Whatever your answer happens to be, you need to thoroughly and in details explain why and how this is doing what you think.

Solution

1. This is a device used for providing unifirm light intensity of headlight of motorcycle both at low rpm of engine and higher rpm of the engine.

2. Normally in a motorcycle, the headlight is fed by a dynamo which is driven directly by the engine crankshaft. As a result, the output of the dynamo and the intensity of light of the headlight vary with the RPM (rotational speed ) of the engine. This causes less light at idling and low speed while getting the full light at the maximum speed. The amount of light thus gradually increases from low to its full with increase of speed of engine. This may result in lower light at the time of idling, coasting and at lower speeds.

The arrangement shown in the figure helps to provide more or less uniform light throughtout the rpm range of the engine.

When the engine is idling or at low rpm, the throttle is opened slightly causing uncovering of the inlet port to air turbine from the suction line near the thottle. Due to suction from the engine to which the outlet of air turbine is connected, air is drawn to the engine cylinder through the passage of air turbine inlet, driving the air turbine , and through the outlet of air turbine. This drives the air turbine and hence the electrical generator or additional small dynamo. This additional electricity is used to supplement the original output of the first dynamo output to get full lighting of the headlight.

As the speed increases by opening the throttle more, the air fuel mixture find it way to the cylinder directly ( without going through the turbine) since it is a direct opening with less resistance due to full opening of throttle.

Thus the output from the air turbine and additional dynamo is inversly proportinal to throttle opening, engine speed and the main dynamo output. This gives a fairly uniform light intensity of headlight throughout the throttle range of the engine.