Servo-assisted butterfly valve provided with a compression spring to stabilise the limp-home positions
First Claim
1. A servo-assisted butterfly valve (1) for an internal combustion engine comprising a valve body (2), a valve seat (4) formed 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, an electric actuator (3) coupled to the shaft (6) in order to rotate the butterfly body (5) between a position of maximum opening and a closed position of the valve seat (4), a first elastic body (23) adapted to rotate the butterfly body (5) towards the closed position, a second elastic body (25) adapted to rotate the butterfly body (5) towards an open position, and an abutment body (28) which causes the action of the second elastic body (25) to stop when the butterfly body (5) is in a partially open or limp-home position, the butterfly valve (1) being characterized in that the second elastic body (25) is a compression spring and has a mechanically fixed end (26) connected to the valve body (2) and a mechanically moving end (27) connected to a wheel (17) rigid with the shaft (6) by means of the interposition of a transmission member (31) mounted to slide within a first chamber (29) housing the second elastic body (25), the abutment body (28) being rigid with the first chamber (29) and being adapted to limit the stroke of the transmission member (31) along this first chamber (29).
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Accused Products
Abstract
A butterfly valve comprising a valve seat, a butterfly body engaging the valve seat, a shaft on which the butterfly body is keyed, an electric actuator coupled to the shaft, a torsional return spring adapted to rotate the butterfly body towards a closed position, a compression abutment spring adapted to rotate the butterfly body towards an open position, and an abutment body which causes the action of the abutment spring to stop when the butterfly body is in a limp-home position; the abutment spring having a mechanically fixed end connected to the valve body and a mechanically moving end connected to a wheel rigid with the shaft by means of the interposition of a transmission member mounted to slide within a chamber housing the abutment spring.
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Citations
16 Claims
- 1. A servo-assisted butterfly valve (1) for an internal combustion engine comprising a valve body (2), a valve seat (4) formed 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, an electric actuator (3) coupled to the shaft (6) in order to rotate the butterfly body (5) between a position of maximum opening and a closed position of the valve seat (4), a first elastic body (23) adapted to rotate the butterfly body (5) towards the closed position, a second elastic body (25) adapted to rotate the butterfly body (5) towards an open position, and an abutment body (28) which causes the action of the second elastic body (25) to stop when the butterfly body (5) is in a partially open or limp-home position, the butterfly valve (1) being characterized in that the second elastic body (25) is a compression spring and has a mechanically fixed end (26) connected to the valve body (2) and a mechanically moving end (27) connected to a wheel (17) rigid with the shaft (6) by means of the interposition of a transmission member (31) mounted to slide within a first chamber (29) housing the second elastic body (25), the abutment body (28) being rigid with the first chamber (29) and being adapted to limit the stroke of the transmission member (31) along this first chamber (29).
Specification