NOVELTY - The saver has a saver main body for saving mechanical power by torque amplification of an output shaft of a power source, where mechanical power saving is directly proportional to torque amplification. The main body is provided with two mechanical elements that are a constant torque cam (10) and hinged levers (9) in device geometry. The main body includes input shafts (2) and gears (3-8) for transmitting torque and fixtures to mount the levers. Moving parts are enclosed in a device housing (1) containing lubricating oil for effective lubrication of bearings and components.    USE - Mechanical power saver for achieving mechanical saving of power for rotating equipments, a prime mover or electrical motor, renewable energy source, electricity grid booster stations and human power (all claimed), by performing efficient energy conversion.    ADVANTAGE - The saver achieves increase in horse power by the saver to reduce power required to perform work, thus improving efficiency of energy conversion. The saver provides torque amplification to the driven rotating shaft without affecting rotational speed so as to achieve increase in power output from the saver, thus enabling power saving by optimizing the size of the prime mover for a particular application. The saver is inexpensive, simple to manufacture, quick to use and easy to maintain, and has prolonged service life, and reduces full load current of the motor or bring down fuel consumed in case of an engine if the saver is coupled to a machinery, provides simple machines to be cost effective and reliable with attractive return on investment, and offers high degree of industrial adaptation with ease of manufacture. The saver reduces carbon emission and pollutants, frictional losses and losses due to moment of inertia and other forces that bring down efficiency of the device, and manufacturing cost for the device which is easily adapted by persons without assistance in an industry, improves scale ability, and achieves enhancement for renewable energy sector and fast adaptation of clean energy with efficient utilization and cost effectiveness.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a mechanical power saver.    Device housing (1)    Input shafts (2)    Gears (3-8)    Hinged levers (9)    Constant torque cam (10)