This device, representative of a crank type connecting mechanism, simply illustrates the operation of a heat engine. The students carry out elementary experiments making it possible to establish the relations linking together the various characteristic parameters of this mechanism.
The SAN apparatus 128 is intended to illustrate, in a simple manner, a motor mechanism; students can use it to determine :
The force exerted on the crank can be determined by fixing adequate masses to the balancing arm. The piston is equipped with nylon rollers that move on guides and the connecting rod has needle bearings to minimize friction. A protractor is attached to the crank; it can be turned on the balance arm and locked in any predetermined position. A graduated ruler to the piston guide can measure the displacement of the latter.