TRW has started production of its dual stage transmission oil pumps for use on two “major, unnamed European vehicle platforms”.
The supplier said the new pump is suitable for dual wet clutch transmissions due to its ability to integrate two external gear pumps into a single housing.
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The first stage is a low pressure pump which cools and lubricates the wet clutches with oil. The second stage is a high pressure pump that serves as a hydraulic pressure source to actuate the clutches, shift forks and other elements.
An electric motor runs the pump at variable speeds, operating only on demand and reducing viscous friction losses.
“TRW has been working on the integration of electric motors, pumps and electronics for many years and has produced millions of highly integrated motor pump units for various applications,” said TRW transmission motor pump unit business, Gregor Eipert.
“By using sintering technologies, the dual stage pump is efficient and cost effective for dual wet clutch transmissions. Our customers also benefit from the integrated dual stage pump which uses just one pump and one electric motor to provide the same functionality as comparable systems which need two pumps and two electric motors.”
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