Transmission testing/ Gearbox testing

The transmission testing/ gearbox testing can simulate all load & torque on the gearbox.

Transmission test bed / Gearbox test bed

The transmission testing/ Gearbox testing is a large-scale measure and control system which is designed elaborately for different types of transmission testing and manufacturing standard tests. The whole transmission testing system controls and measures all kinds of transmission parameters such as rotating speed, torque, power and temperature.



The transmission testing system design adopts the mature and reliable rotating speed and torque sensors as the measuring components. The rotating speed and torque of transmission can be measured accurately. The design also adopts the AC variable frequency motor and AC variable frequency inverter to precisely drive and control the transmission rotating speed. It adopts the mechanical loader to control the transmission torque loading. The advanced computational technology is applied on the data acquisition and measure control in the system.

The system is composed of instrument cabinet (measuring part, control part, data acquisition part, industrial control computer, power source management unit, programmable logic controller), dynamometer, temperature control system, variable frequency motor, variable frequency inverter, mechanical loader and mechanical part (drive shaft, shaft coupling).



Transmission explanation

Early transmissions included the right-angle drives and other gearing in windmills, horse-powered devices, and steam engines, in support of pumping, milling, and hoisting.



Most modern gearboxes either reduce an unsuitable high speed and low torque of the prime mover output shaft to a more stable lower speed with higher torque, or do the opposite and provide a mechanical advantage (i.e increase in torque) to allow higher forces to be generated. Some of the simplest gearboxes merely change the physical direction in which power is transmitted.



Many typical automobile transmissions include the ability to select one of several different gear ratios. In this case, most of the gear ratios (simply called "gears") are used to slow down the output speed of the engine and increase torque. However, the highest gears may be "overdrive" types that increase the output speed.



Use of Transmission

Gearboxes have found use in a wide variety of different applications.

Transmissions are also used in agricultural, industrial, construction, mining and automotive equipment. In addition to ordinary transmission equipped with gears, such equipment makes extensive use of the hydrostatic drive and electrical adjustable-speed drives.



Simple transmission

The simplest transmissions, often called gearboxes to reflect their simplicity (although complex systems are also called gearboxes in the vernacular), provide gear reduction (or, more rarely, an increase in speed), sometimes in conjunction with a right-angle change in direction of the shaft (typically in helicopters, see picture). These are often used on PTO-powered agricultural equipment, since the axial PTO shaft is at odds with the usual need for the driven shaft, which is either vertical (as with rotary mowers), or horizontally extending from one side of the implement to another (as with manure spreaders, flail mowers, and forage wagons). More complex equipment, such as silage choppers and snowblowers, have drives with outputs in more than one direction.



Multi-ratio transmission

Many applications require the availability of multiple gear ratios. Often, this is to ease the starting and stopping of a mechanical system, though another important need is that of maintaining good fuel economy.

The need for a transmission in an automobile is a consequence of the characteristics of the internal combustion engine. Engines typically operate over a range of 600 to about 7000 revolutions per minute (though this varies, and is typically less for diesel engines), while the car's wheels rotate between 0 rpm and around 1800 rpm.