초록 ▼

The invention concerns a butterfly valve for regulating a fluid flow rate in particular the air flow rate of an air distributor in an internal combustion engine fuel injector, and the method for making the valve. The valve (1) comprises a housing (2) traversed by a conduit (3) circulating the fluid

The invention concerns a butterfly valve for regulating a fluid flow rate in particular the air flow rate of an air distributor in an internal combustion engine fuel injector, and the method for making the valve. The valve (1) comprises a housing (2) traversed by a conduit (3) circulating the fluid wherein is provided a butterfly induction shutter (4) mounted on a control axis (5) perpendicular to the conduit axis. The invention is characterized in that it comprises a ring (6) co-axial with the conduit and set between the housing (2) and the induction shutter (4), the ring (6) being made of a material with good dimensional stability and the housing being molded around the ring in a material resistant to the imposed technical constraints and the ring (6) is so arranged that, when the shutter is in closed position, there still is a predetermined clearance between the ring (6) active inner surface (13) and the induction shutter (4) arranged to allow a minimal and time-constant fluid flow rate whatever the variations in humidity or temperature. The invention is applicable to internal combustion engine and any device requiring fluid flow rate regulation.

대표청구항 ▼

[ What is claimed is:] [1.] A butterfly valve (1, 21) for controlling the flow of a fluid, in particular the air flow rate entering an air distributor provided in a fuel injection device for an internal combustion engine, said valve comprising a housing (2, 22) made of a molded synthetic material, a

[ What is claimed is:] [1.] A butterfly valve (1, 21) for controlling the flow of a fluid, in particular the air flow rate entering an air distributor provided in a fuel injection device for an internal combustion engine, said valve comprising a housing (2, 22) made of a molded synthetic material, a conduit (3, 23) arranged in said housing for through fluid flow, a control shaft (5, 25) guided in the housing, a butterfly shutter (4, 24) located at right angles to the conduit and mounted on said control shaft, the butterfly shutter (4, 24) designed to move between a position in which the conduit is closed and the butterfly shutter is oriented substantially perpendicular to the conduit and a position in which the conduit is fully open and the butterfly shutter is oriented substantially parallel to said conduit, wherein the butterfly valve is comprised of a ring (6, 26) with an upstream end and a downstream end coaxial to the conduit (3, 23), the ring inserted between the housing (2, 22) and the butterfly shutter (4, 24), the ring provided with a transverse guide bore (17) designed to receive the shutter's control shaft (5, 25), and comprising an active inner surface (13, 33) forming a seat for said butterfly shutter (4, 24) in the shutter closed position, the ring (6, 26) made of a dimensionally stable preselected material, and the housing (2, 22) of a preselected material molded around said ring, said ring (6, 26) arranged to provide, when the shutter (4, 24) is closed, a set clearance between the ring (6, 26) active inner surface (13, 33) and the butterfly shutter (4, 24), said clearance permitting a minimum fluid flow rate which is time-constant regardless of variations in humidity or temperature.