Schaeffler Technologies Ag & Co .kg

Ina Schaeffler Kg

Eric Nelson

Marion Jack Ince

Charles Schwab

Joseph T Griffin

Ross A Gresley

Richard S Carpenter

The two stage check valve for the automatic transmission system provides a first member that opens in response to a first pressure and a second member which opens in response to a second pressure where the second pressure is higher than the first pressure.

Two stage check valve for automatic transmission system

The invention concerns the fixing of a bearing shaft () in a reception bore () of a housing, at least one end of the shaft being adapted to be swaged to the reception bore () for achieving at least one of a force locking and a positive engagement, and an outer peripheral surface of the shaft () having a hardness that is greater than a hardness of the ends () of the shaft. The novel shaft is carbonitrided, quenched and tempered so that at first a hardness of HV 745-950 (HRC 62-68) is realized, following which the thus treated shaft () is soft annealed to produce a hardness of HV 212-305 (HRB 93-HRC30), and the outer peripheral surface is then subjected to induction hardening to achieve a final hardness of HV 745-950 (HRC 62-68). The shaft of the invention has a long operating life even under high load conditions.

Positional fixing of a shaft

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Charlotte, NC, United States of America

Eric Nelson