초록 ▼

The valve (16) has a ball shutter (18) normally pushed by a helical compression spring (24) to close a delivery conduit (11) of the pump (5). A first end (28) of the spring (24) rests against a shoulder (26) of a fastening member (21) fitted in fluidtight manner to the pump (5); a second end (31) of

The valve (16) has a ball shutter (18) normally pushed by a helical compression spring (24) to close a delivery conduit (11) of the pump (5). A first end (28) of the spring (24) rests against a shoulder (26) of a fastening member (21) fitted in fluidtight manner to the pump (5); a second end (31) of the spring (24) acts directly on the ball (18); the fastening member (21) has a pin (33) coaxial with the conduit (11) and of such a length as to limit the travel of the ball (18) to a predetermined value; and the second end (31) of the spring (24) has at least one small-diameter turn (34) by which to engage the ball (18).

대표청구항 ▼

1. A delivery valve of an internal combustion engine high-pressure fuel pump, comprising a delivery conduit communicating with a compression chamber of the pump, a shutter ball normally pushed by a helical compression spring to close a truncated-cone-shaped seat provided at an end of said conduit, a

1. A delivery valve of an internal combustion engine high-pressure fuel pump, comprising a delivery conduit communicating with a compression chamber of the pump, a shutter ball normally pushed by a helical compression spring to close a truncated-cone-shaped seat provided at an end of said conduit, a hole in said pump coaxial with said conduit and provided with a threaded portion, and a fastening member comprising a threaded portion screwing inside the treaded portion of said hole, wherein said fastening member is provided with a pin coaxial with said conduit for securing said spring, said pin being of such a length as to limit the travel of said ball to a predetermined value, said fastening member being also provided with a first shoulder adapted to be engaged by a first end of said helical spring, a second end of said spring comprises at least one small-diameter turn directly engaging said ball, said fastening member also having a cylindrical surface adjacent said first shoulder of said fastening member, said cylindrical surface, engaging in fluidtight manner, a corresponding cylindrical surface of said hole. 2. A valve as claimed in claim 1, wherein said fastening member has a truncated-cone-shaped surface located between said cylindrical surface of said fastening member and said first shoulder of said fastening member. 3. A valve as claimed in claim 1, wherein said spring is truncated-cone-shaped; said turn being the smallest-diameter turn. 4. A valve as claimed in claim 1, for a pump having radial pistons engaging respective cylinders in which the pistons define respective compression chambers; wherein said delivery conduit communicates with said compression chambers via intermediate conduits. 5. A delivery valve of an internal combustion engine high-pressure fuel pump, comprising a delivery conduit communicating with a compression chamber of the pump, a shutter ball normally pushed by a helical compression spring to close a truncated-cone-shaped seat provided at an end of said conduit, a hole in said pump coaxial with said conduit and provided with a threaded portion, and a fastening member comprising a threaded portion screwing inside the threaded portion of said hole, wherein said fastening member is provided with a pin coaxial with said conduit for securing said spring, said pin being of such a length as to limit travel of said ball to a predetermined value, said fastening member being also provided with a first shoulder, located internally with respect to the relevant threaded portion, contacting a shoulder of said hole in fluidtight manner, and with a second shoulder adapted to be engaged by a first end of said helical spring, a second end of said spring comprising at least one small-diameter turn directly engaging said ball. 6. A delivery valve of an internal combustion engine high-pressure fuel pump, comprising a delivery conduit communicating with a compression chamber of the pump, a shutter ball normally pushed by a helical compression spring to close a truncated-cone-shaped seat provided at an end of said conduit, a hole in said pump coaxial with said conduit and provided with a threaded portion, and a fastening member comprising a threaded portion screwing inside the threaded portion of said hole, wherein said fastening member is provided with a first shoulder contacting a shoulder of said hole in fluidtight manner, and with a second shoulder adapted to be engaged by a first end of said helical spring, a second end of said spring comprising at least on small-diameter turn directly engaging said ball, said fastening member also having a cylindrical surface adjacent said first shoulder of said fastening member, said cylindrical surface engaging, in fluidtight manner, a corresponding cylindrical surface of said hole.