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US 2008/0175735 A1Published application
Inlet pressure attenuator for single plunger fuel pump
AssigneeStanadyne, Inc.
InventorsRobert Lucas, Ilija Djordjevic
Life of this patent
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Abstract
An attenuator diaphragm assembly for a fuel injection pump, comprising a diaphragm formed of two half-shells, having mated flat rims that are welded together along their peripheral edges and a compression joint formed at inward, unwelded portions of the rims, and a carrier that captures the joined and welded rims.
Claims16
In a fuel pump having single plunger that reciprocates into and out of a pumping chamber situated within a pump housing;
- a pressurized inlet line through the housing to an inlet valve that feeds the pumping chamber;
- a damping chamber integrated with the housing, in which fuel passes around at least one gas filled and sealed attenuator diaphragm along a flow path to the inlet valve;
- each diaphragm being formed of two half-shells, having central convex bulges and mated flat rims which are supported in a diaphragm carrier within the damping chamber;
- wherein the improvement comprises that the rims are welded together along their outer edges and a compression joint is formed at inward, unwelded portions of the rims to reduce stresses transmitted to the welded edges.
1 more element
An attenuator diaphragm assembly for a fuel injection pump, comprising:
- a diaphragm formed of two half-shells, having mated flat rims that are welded together along their peripheral edges and a compression joint formed at inward, unwelded portions of the rims;
- and a carrier that captures the joined and welded rims.
Dependencies are inferred from the claim text.