Decoupling element for a fuel-injection device
First Claim
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
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Citations
20 Claims
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1. 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. - View Dependent Claims (2, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16)
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3. A device comprising:
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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 conically or spherically shaped and is in contact with a spherically curved or conical downwardly facing shoulder end face of the housing of the fuel injector; at a point of the contact, each of the upper end face of the closed ring and the downwardly facing end face of the housing of the fuel injector radially interiorly slopes upward; and a larger play exists radially inwardly of the closed ring, between the closed ring and the fuel injector than exists radially outwardly of the closed ring, between the closed ring and the wall of the receiving bore. - View Dependent Claims (9)
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17. A device comprising:
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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. - View Dependent Claims (18, 19, 20)
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Specification