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Servo-assisted butterfly valve for an internal combustion engine provided with an adjustment system for the limp-home position

  • US 20040226538A1
  • Filed: 01/22/2004
  • Published: 11/18/2004
  • Est. Priority Date: 01/24/2003
  • Status: Active Grant
First Claim
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1. A servo-assisted butterfly valve (1) for an internal combustion engine comprising a valve body (2), a valve seat (4) defined in the valve body (2), a butterfly body (5) adapted to engage the valve seat (4), a shaft (6) on which the butterfly body (5) is keyed and housed by the valve body (2), an electric actuator (3) coupled to the shaft (6) in order to rotate the butterfly body (5) between an open and a closed position of the valve seat (4), an elastic member (23) which is adapted to exert a torque on the shaft (6) which tends to rotate the butterfly body (5) towards a limp-home position and an abutment body (29) which forms an abutment surface for an abutment member (28) of the elastic body (23) in order to stop, in the desired limp-home position, the rotation of the butterfly body (5) caused by the elastic body (23) in the absence of action by the electric actuator (3);

  • the abutment body (29) comprising an eccentric member (35) which is adapted to rotate with respect to the valve body (2) with a predetermined eccentricity about an adjustment axis (31);

    the butterfly valve (1) being characterized in that the elastic body (23) comprises a first spring (24) provided with a first projection (25) coupled mechanically to the shaft (6) and a second spring (26) provided with a projection (27) coupled mechanically to the valve body (2), the first and second springs (24, 26) being connected together by a curved member (28) which forms the abutment member (28).

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