Fuel pump tappet assembly
AssigneeCummins Inc.
InventorsJohn D. Crofts, Justin Gregory Wenger
Life of this patent
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Abstract
A fuel pump assembly for an internal combustion engine includes a fuel pump housing, a cylindrical bore defined in the fuel pump housing, and a tappet assembly received in the cylindrical bore. The tappet assembly includes a one-piece shoe having a recess disposed in a bottom portion thereof, and a roller that is partially received within the recess and configured to rotate about a roller axis.
Claims19
A fuel pump assembly for an internal combustion engine comprising:
- a fuel pump housing;
- a cylindrical bore defined in the fuel pump housing, wherein an upper end of the cylindrical bore is closed by a lower surface of a cylinder head;
- and
- a tappet assembly slideably received in the cylindrical bore, wherein the tappet assembly includes a one-piece shoe having a recess defined in a bottom portion thereof, and a roller that is partially received within the recess and configured to engage a cam lobe and to rotate about a roller axis, wherein the shoe comprises a peripheral surface having a cylindrical shape that is configured to correspond to an inside surface of the cylindrical bore, wherein the shoe further comprises two opposed end portions, wherein each of the end portions comprises a flat surface that extends across a corresponding end of the recess beyond which a corresponding end of the roller extends, wherein along the roller axis each of the flat surfaces is an outermost portion of the shoe.
A fuel pump assembly for an internal combustion engine comprising:
- a fuel pump housing;
- a cylindrical bore defined in the fuel pump housing;
- and
- a tappet assembly slideably received in the cylindrical bore, wherein the tappet assembly includes a roller configured to rotate about a roller axis and a shoe, the shoe comprising:
- an upper surface;
- a lower surface;
- a recess defined in the lower surface, wherein the recess is configured to partially receive the roller;
- a pair of parallel, opposed end portions, wherein each of the end portions comprises a flat surface that extends across a corresponding end of the recess beyond which a corresponding end of the roller extends, wherein along the roller axis each of the flat surfaces is an outermost portion of the shoe;
- and
- a pair of opposed curved sides extending between the end portions, each curved side having a cylindrical peripheral surface that is configured to correspond to an inside surface of the cylindrical bore.
A tappet assembly configured for use in a fuel pump for an internal combustion engine, the fuel pump including a fuel pump housing having a cylindrical bore defined therein, the tappet assembly comprising:
- a one-piece shoe having a recess defined in a bottom portion thereof;
- and
- a roller that is partially received within the recess and configured to engage a cam lobe and to rotate about a roller axis, wherein the shoe comprises a peripheral surface having a cylindrical shape that is configured to correspond to an inside surface of the cylindrical bore, wherein the shoe further comprises two opposed end portions, wherein each of the end portions comprises a flat surface that extends across a corresponding end of the recess beyond which a corresponding end of the roller extends, wherein along the roller axis each of the flat surfaces is an outermost portion of the shoe.
Dependencies are inferred from the claim text.