Internal combustion engine fuel, preferably diesel fuel, feed pump assembly

Patent metadata

Field	Value
Publication number	US-10352283-B2
Application number	US-201414903865-A
Country	US
Kind code	B2
Filing date	Jul 8, 2014
Priority date	Jul 10, 2013
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

Internal combustion engine fuel, preferably diesel fuel, feed pump assembly, the pump assembly ( 1 ) comprising a pump body ( 2 ); at least one cylinder ( 6 ) formed in the pump body ( 2 ) and extending along an axis (A 2 ); a seat ( 12 ) formed in the pump body ( 2 ), at one end of the cylinder ( 6 ); an intake valve ( 18 ) for selectively controlling fuel feed into the cylinder ( 6 ), which is housed inside the seat ( 12 ) and in turn comprises a valve body ( 25 ); and an annular seal ( 26 ) extending around the axis (A 2 ) and fitted inside the seat ( 12 ) between the valve body ( 25 ) and the pump body ( 2 ); the pump assembly ( 1 ) being characterized in that the valve body ( 25 ) is positioned contacting the annular seal ( 26 ) along a contact surface ( 45 ) of the valve body ( 25 ) and close to a surface portion adjacent to a radially inner peripheral edge ( 46 ) of the seal ( 26 ); the valve body ( 25 ) having an annular step ( 48 ) along another surface portion adjacent to a radially outer peripheral edge ( 52 ) of the seal ( 26 ).

First claim

What is claimed is:

1. An internal combustion engine fuel feed pump assembly, the pump assembly ( 1 ) comprising
a pump body ( 2 ) comprising a head ( 5 ), the head having therein a hole ( 11 );
at least one cylinder ( 6 ) extending along an axis (A 2 ), wherein the hole ( 11 ) is at one end of the cylinder ( 6 );
a piston ( 7 ), the piston reciprocating within the cylinder and the pump body;
an intake valve ( 18 ) for selectively controlling fuel feed into the cylinder ( 6 ), wherein the intake valve is housed inside the hole ( 11 ) and comprises a valve body ( 25 ); and
an annular seal ( 26 ) extending around the axis (A 2 ) and fitted inside the hole ( 11 ) between the valve body ( 25 ) and the pump body ( 2 );
the pump assembly ( 1 ) being characterized in that the valve body ( 25 ) is positioned contacting the annular seal ( 26 ) along a contact surface ( 45 ) of the valve body ( 25 ) and close to a surface portion adjacent to a radially inner peripheral edge ( 46 ) of the annular seal ( 26 );
the valve body ( 25 ) having an annular step ( 48 ) along another surface portion adjacent to a radially outer peripheral edge ( 52 ) of the annular seal ( 26 ), wherein the annular step ( 48 ) has a surface ( 50 ) which is detached axially from the annular seal ( 26 ), wherein the axially detached surface ( 50 ) extends along a dimension perpendicular to the axis (A 2 ) greater than a dimension perpendicular to the axis of the contact surface ( 45 ),
wherein the pump assembly also comprises a chamber ( 38 ) having a cylindrical portion ( 40 ) and a frustoconical portion ( 41 ) respectively defined by a cylindrical wall of the valve body and a frustoconical wall of the valve body ( 25 ), the chamber ( 38 ) communicating with the cylinder ( 6 ),
wherein the annular step ( 48 ) is adjacent the cylindrical wall of the valve body and the cylindrical wall of the valve body is between the annular seal ( 26 ) and the frustoconical wall of the valve body,
wherein the intake valve ( 18 ) includes a shutter ( 35 ) movable along the axis (A 2 ) between an open position and a closed position respectively opening and closing an intake conduit ( 13 ) for drawing the fuel into the cylinder ( 6 ),
wherein, in the closed position, the shutter ( 35 ) contacts the frustoconical wall of the valve body, and
wherein, in the open position, the shutter ( 35 ) extends at least partly outside the cylindrical portion ( 40 ) of the chamber ( 38 ) in a direction toward the annular seal ( 26 ).

2. The internal combustion engine fuel feed pump assembly according to claim 1 , wherein the axially detached surface ( 50 ) extends radially over at least a third of the surface of the annular seal ( 26 ).

3. The internal combustion engine fuel feed pump assembly according to claim 1 , wherein the cylindrical portion ( 40 ) and part of the frustoconical portion ( 41 ) of the chamber ( 38 ) are larger in diameter than the shutter ( 35 ).

4. The internal combustion engine fuel feed pump assembly according to claim 1 , wherein the chamber ( 38 ) is formed coaxially with the axis (A 2 ) of the shutter ( 35 ).

5. The internal combustion engine fuel feed pump assembly according to claim 1 , wherein the intake valve ( 18 ) comprises a locking member ( 27 ) for locking the valve body ( 25 ) against the head ( 5 ) by means of the annular seal ( 26 ) arranged in between.

6. The internal combustion engine fuel feed pump assembly according to claim 1 , wherein the head ( 5 ) comprises an annular projection ( 55 ), which extends around the axis (A 2 ) and contacts the annular seal ( 26 ) along a bottom surface portion adjacent to the radially inner peripheral edge ( 46 ) of the annular seal ( 26 ).

7. The internal combustion engine fuel feed pump assembly according to claim 6 , wherein the chamber ( 38 ) is formed in the valve body ( 25 ) so as to communicate with the cylinder ( 6 ) also when the shutter ( 35 ) is in the closed position.

8. The internal combustion engine fuel feed pump assembly according to claim 7 , wherein the cylindrical portion ( 40 ) and part of the frustoconical portion ( 41 ) of the chamber ( 38 ) are larger in diameter than the shutter ( 35 ).

9. The internal combustion engine fuel feed pump assembly according to claim 8 , wherein the chamber ( 38 ) is formed coaxially with the axis (A 2 ) of the shutter ( 35 ).

10. The internal combustion engine fuel feed pump assembly according to claim 9 , wherein the intake valve ( 18 ) comprises a locking member ( 27 ) for locking the valve body ( 25 ) against the head ( 5 ) by means of the annular seal ( 26 ) arranged in between.

Assignees

• Bosch Gmbh Robert

Inventors

• Tavani Manuel
• Guarino Rocco
• Damiani Fabio

Classifications

• F02M59/06

  with cylinders arranged radially to driving shaft, e.g. in V or star arrangement · CPC title

• F04B1/0452 Primary

  Distribution members, e.g. valves (machines or pumps with cam-actuated distribution members at the outer ends of the cylinders F04B1/0472; machines or pumps with cam-actuated distribution members at the inner ends of the cylinders F04B1/0531; the piston-driving cams being provided with inlets and outlets F04B1/0535) · CPC title

• F02M59/442

  means preventing fuel leakage around pump plunger, e.g. fluid barriers · CPC title

• F04B53/1025

  the guiding means being provided within the valve opening · CPC title

• F02M59/102

  Mechanical drive, e.g. tappets or cams (F02M45/063 takes precedence) · CPC title