Orifice Control Within the Converter

Orifice Control Within the Converter Parts 1 and 2 briefly touched on the secondary oil paths through TCC pistons, turbines, and stator caps. This final article will cover regulation and possible restrictions of converter charge/TCC release oil flow.

The secondary path of the charge/TCC release oil is regulated to some degree by transmission parts which are located within the confines of the converter. In some units, the charge oil is regulated by the orifice created between the raised area on the stator shaft (or support) and the impeller hub. In other units, it is regulated by restricting the flow of oil through or around the input shaft bushing mounted inside the stator support. The Allison 500 series is a unique example because it uses both methods to regulate oil flow, as it enters and exits the converter.

Some transmissions have a separate torque converter regulator valve that works in conjunction with the main pressure regulator valve. The Borg Warner transmissions (T-35 Model 12 and FMX) are early examples of this design where the valve was used to control the flow and regulate the pressure at about 40 PSI.

To read the rest of this Technical Article on the Sonnax Website click here.

Article No.: TCTIP-10-09
Author: Ed Lee
Total Pages: 2

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