US 10,641,224 B2 · Decoupling element for a fuel-injection device

Abstract

A decoupling element for a fuel-injection device has a low-noise and pivotable construction. The fuel-injection device includes at least a fuel injector and a receiving bore in a cylinder head for the fuel injector as well as the decoupling element between a valve housing of the fuel injector and a wall of the receiving bore. The decoupling element is in the form of a ring, in particular a closed ring, which has a lower end face that sits on a shoulder of the receiving bore, and which has an upper end face that rises conically from radially outside toward radially inside and is in intimate contact with a spherically curved shoulder area of the valve housing of the fuel injector. The fuel-injection device is particularly suitable for the direct injection of fuel into a combustion chamber of a mixture-compressing combustion engine having externally supplied ignition.

Claims20

Dependent claims

A decoupling element designed for arrangement between a housing of a fuel injector and a wall of a receiving bore in which the fuel injector is received for fuel injection into a combustion chamber, the decoupling element comprising:

a closed ring, wherein:
the closed ring is designed to be arranged with:
a lower end face of the closed ring sitting on a shoulder of the receiving bore;
and
an upper end face of the closed ring being conically or spherically shaped, sloping upward from radially outside toward radially inside, and being in contact with a spherically curved or conical shoulder area of the housing of the fuel injector;
and
at least one of:
respective transitions of the upper end face and the lower end face toward inner and outer annular lateral areas of the closed ring are rounded;
at least one guide element radially projects at an outer periphery of the closed ring;
and
the decoupling element further includes at least one of:
a collar that axially projects from the closed ring and that includes an annular guide element at an outer periphery of the collar;
and
a securing ring that includes a circumferential ring collar from which a plurality of bracing tabs, that are distributed across its periphery, extend.

11 more elements

A device comprising:

a fuel injector;
a chamber head including a receiving bore in which the fuel injector is received;
a closed ring that is arranged between a housing of the fuel injector and a wall of the receiving bore, wherein:
a lower end face of the closed ring sits on a shoulder of the receiving bore;
an upper end face of the closed ring is in contact with a shoulder of the housing of the fuel injector;
and
any one or more of the following four features (a)-(d):
(a) in a first axial region, a clearance between (1) a radially interior side surface of the closed ring and (2) a radially exterior surface of the fuel injector facing the radially interior side surface of the closed ring is greater than a clearance between (1) a radially exterior side surface of the closed ring and (2) a portion of the wall of the receiving bore facing the radially exterior side surface of the closed ring;
(b) the closed ring includes radially outwardly extending projections that project laterally towards the wall of the receiving bore;
(c) a clearance between (1) a most radially-exterior edge of the closed ring in the region below the shoulder of the receiving bore and (2) a portion of the wall of the receiving bore facing the most-radially exterior edge of the closed ring in the region below the shoulder of the receiving bore is different than a clearance between (1) a most radially-exterior edge of the closed ring in a region above the shoulder of the receiving bore and (2) a portion of the wall of the receiving bore facing the most-radially exterior edge of the closed ring in the region above the shoulder of the receiving bore;
and
(d) the device further comprises a securing ring, and the securing ring at least one of:
(1) contacts an underside surface of the closed ring and one or both of the following:
(i) extends radially inwardly from beneath the underside surface of the closed ring, beyond a most-radially interior edge of the closed ring, to a radially interior edge of the securing ring at which the securing ring contacts the housing of the fuel injector;
and
(ii) is braced against the housing of the fuel injector below the shoulder of the receiving bore;
and
(2) includes a circumferential ring collar from which a plurality of tabs extend radially inwardly.

15 more elements

Dependencies are inferred from the claim text.

Decoupling element for a fuel-injection device

Life of this patent

Decoupling element for a fuel-injection device

Life of this patent

Abstract

Claims20