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Test Stand for Automatic and Specialized Transmissions
Various automatic transmissions from renowned, internationally operating manufacturers in the automotive industry are subjected to comprehensive testing in a test stand for transmission prototypes.
Technical data
Media | Automatic transmission fluids (ATF) and hypoid oils |
Temperature | 5 °F to 302 °F (-15 °C to 150 °C) |
Pressure | Up to 72.5 psi (5 bar) |
Measuring range | 0.1 l/min to 7 l/min |
Density | 0.88 kg/l |
Viscosity | 5 cSt to 80 cSt |
Application
Various automatic transmissions from renowned, internationally operating manufacturers in the automotive industry are subjected to comprehensive testing in a test stand for transmission prototypes. Specialty transmissions for use in hybrid or electric vehicles are tested as well. Each newly developed transmission can only leave the plant after successfully completing various cycles of hydraulic, acoustic, electronic, or similar tests.
KEM Product
A KEM Gear Flow Meter (ZHM 02 KL Series with Ball Bearing) and a Local Display with inductive pickup (VIC).
Challenge
Recirculating lubrication is checked in one of the numerous tests. This is done with low flow volumes for a very large temperature range and at a very low primary pressure. Typical values are less than 72.5 psi. Far lower pressure levels are used in some cases. The challenge for flow measurement is to achieve a particularly high measuring accuracy notwithstanding the expected viscosity changes caused by the large temperature range. Also the allowable pressure loss in this measuring cycle is extremely small.
Solution
The chosen KEM Gear Flow Meter with high quality precision ball bearing permits reliable, precise measurement over a very large viscosity and flow rate range. Even at high temperatures, the volume flows are reliably evaluated by the compact Local Display VIC with its inductive sensor, and sent to the customer’s test stand as a 4-20 mA signal. The relevant measurement results are also displayed on-site on the graphical display
Benefits
- Precise measurement, even of low flow volumes with reliable, high frequency signal output
- Direct reading of the measurement results on the digitally scalable Local Display
- Analog signals (4-20 mA) can be used for automated electronic measurement data evaluation