Transmission Dyno Stand
Dyno stands allow testing complete gearboxes in assembly checking their performance and understand if it is comparable to benchmark characteristics. It is the tool that is certainly needed to provide certified transmission quality. There are options that allow advanced testing of FWD, RWD, AWD automatic transmission vehicles, for both civil and heavy duty models. A dyno stand used to be an expensive option for big-scale car transmission rebuilders but more accessible quality options start to emerge on the international transmission service market.
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Transmission testing stands cover the complete range of civil-vehicle and heavy-duty transmission on the market today. Precision alignment tooling and acquisition and control systems play an important part in quality transmission testing.
The key to understanding the concept behind the name is to define its key words: “dynamometer” consists of two words - dynamo (Greek for “power in motion”) and meter (also Greek for “measurement”). Very often it is simply called as “dyno”.
There are two types of dyno stands - engine dynamometers and chassis dynamometers. In order to measure the power of an engine on the engine dyno, it must be removed from the vehicle and installed on the engine stand by connecting directly to the flywheel. Special adapters are used for this purpose and it is also necessary to connect the cooling system, etc. - all in all, this procedure takes a lot of time. Until recently, this kind of stands had been mainly used by engine developers, but nowadays dyno stands have become accessible to professional transmission repair specialists as well.
Modern dyno stands feature complete computerized control for extremely precise test procedures that are easy to repeat. They fit most USA home and non-national RWD, FWD, transverse, and Continuously-Variable Transmission gearboxes. These dyno stands test gearbox line pressure, TC lockup and downshift, and other characteristics - such as shift point and response, stall speed and more. All this is done under emulated load conditions for vehicles. Transmission specialists acquire complete control of both the gearbox and the dyno unit - with potentiometers for speed and load. Transmission rebuilders will be able to spot ATF and pressure leakage, check controls of the systems and hydraulics, and perform insignificant corrections while the gearbox is mounted on the tester.
Modern advanced dyno stands allow control and full testing of electronically shifted Mechatronic gearboxes and valve bodies.
Features of the modern dynos include but are not limited to: state-of-the-art software for shift control and dyno control; advanced motor control strategies to accurately emulate transmission inputs from internal combustion engines; possibility to accurately emulate real conditions of driving; stall brake with control activated by feet (available computerized control); possibility to easily and quickly mount and dismount a gearbox unit; fill and drain pumps with hoses to fill and drain filtered Automatic Transmission Fluid; complete tooling kits for precision alignment, eliminating any possibility to damage pump bushings and pumps; pilot bushings for accurate, no inconvenience gearbox alignment.
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