Specification:
Most road vehicles are fitted with variable-ratio gearboxes as a means
of obtaining the best power application under varying road conditions.
Fundamentally the gearbox consists of gear wheels of different sizes, which may be engaged as required.
The gearbox has been designed to represent a typical arrangement of a simple three forward ratio and reverse sliding mesh box.
The unit may be used for classroom demonstrations and by students in the laboratory.
Pulleys fitted with protractors are attached to the input and output
shafts so that the student may determine and verify velocity and torque
ratios.
The gearbox can be coupled to the Overdrive and Differential to represent a simple transmission system.
The 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.
