Control box
AssigneeBorgWarner Inc.
InventorsHelmut Rodenhaeuser, Juergen Tschirschke
Life of this patent
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Abstract
A control box for use, for example, to open and close a bypass valve (18, 19) of a turbocharger, in which the closing movement occurs with higher force than the opening movement, wherein the closing movement occurs in the direction of a spring force and the opening movement in the direction against said spring force. The control box comprises two pressure chambers (4, 6) and both pressure chambers may be set to either atmospheric pressure or negative pressure.
Claims6
A control box for transformation of a control signal into a mechanical movement and for conveying said mechanical movement to a component to be controlled, said control box comprising a first pressure chamber (4), a second pressure chamber (6), a membrane (12) that separates said two pressure chambers from each other in a gas tight manner, a spring that pre-tensions said membrane in a first direction and a control rod which may be caused by said membrane (12) to execute control movements, at least one of said two pressure chambers (4, 6) being susceptible to be subjected to a change of pressure, thereby causing a control movement of said control rod, wherein said first pressure chamber (4) and said second pressure chamber (6) are connectable to one or several negative pressure sources via pressure ducts (10c, 22c), and wherein spring (3c) is located in the second pressure chamber.
Dependencies are inferred from the claim text.