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Most road vehicles are fitted with variable ratio gearboxes as a means of obtaining the best power application under the varying road conditions. The unit may be used for classroom demonstrations and by students in the laboratory.

SAN115The sliding mesh box, although it is still used on heavy commercial vehicles, is seldom found on modern cars, but its basic construction and operation are important from the student's point of view as it represents the basic layout from which most modern gearboxes have been developed.

Teaching objectives

- Measure of the angular displacement at the input and output of the gear box and comparison with the calculated values
- Calculation of the efficiency for different ratios according to the torque at entry


Technical specifiations

- Fundamentally the gearbox consists of gear wheels of different sizes which may be engaged as required.
- Simple three forward ratio and reverse sliding mesh box.
- Pulleys fitted with protractors are attached to the input and output shafts so that the student may determine and verify velocity and torque ratios.
- Experiment manual


Dimensions and weight

- 540 x 480 x 270 mm approx.

- Net Weight 14 kg.


Essential requirements

A set of masses ref SAN115/W (not supplied as standard)

Optional equipment :
-The Gearbox can be coupled to the Overdrive (Ref SAN117) and Differential (Ref SAN116) to represent a simple transmission system.
-The unit may be wall mounted or attached to Universal Bench Mounting Frame (Ref SAN110).