Description:Complete Specification:

The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001] This invention relates to a flange positioned proximate to a shaft of a high-pressure fuel pump, and more specifically to the flange with an internal anti-displacement pin to avoid shaft sealing ring displacement.

Background of the invention
[0002] DE 102005004315 A1 describes a governable cooling medium pump for internal combustion engines that has an armature stop installed next to a sealing seat, an armature movable on a shaft, and a valve slide installed adjacent to an armature. The governable cooling medium pump comprises an anti-magnetic shaft, a support seat located in the pump casing and in which is located a holding element with a bearing sleeve installed in it. A bearing seat is located on the bearing sleeve and upon it is rotatably mounted a belt pulley by means of a rolling bearing. A sealing seat is located in the bearing sleeve and in the sealing seat is fastened a radial shaft sealing ring installed on the running section of the shaft. An armature stop is installed next to the sealing seat. An armature is movable on the shaft, and a valve slide is installed adjacent to the armature.

Brief description of the accompanying drawing
[0003] Figure 1 illustrates a flange with an internal anti-displacement pin positioned proximate to a shaft of a high-pressure fuel pump to avoid shaft sealing ring displacement in one embodiment of the invention.

Detailed description of the embodiments
[0004] Figure 1 illustrates a high-pressure fuel pump 100. The high-pressure fuel pump 100 comprises a housing 110, and a shaft 120 positioned within the housing 110. The shaft 120 is adapted to rotate within the housing 110 to facilitate delivering pressurized fuel from the high-pressure fuel pump 100 to a fuel injector. A flanged portion 130 is positioned proximate to the shaft 120 positioned within the housing 110. A first shaft sealing ring 140 is positioned between the shaft 120 positioned within the housing 110 and the flanged portion 130 positioned proximate to the shaft 120 that is positioned within the housing 110. A second shaft sealing ring 150 is positioned between the shaft 120 that is positioned within the housing 110 and the flanged portion 130 positioned proximate to the shaft 120 positioned within the housing 110, the second shaft sealing ring 150 positioned proximate to the first shaft sealing ring 140. The second shaft sealing ring 150 is axially spaced apart from the first shaft sealing ring 140. An anti-displacement pin 160 is inserted through a groove 170 extending from an outer surface 180 of the flanged portion 130 to an inner surface 140 of the flanged portion 130 such that the anti-displacement pin 160 extends between and abuts against the first shaft sealing ring 140 and the second shaft sealing ring 150 such that the first shaft sealing ring 140 is prevented from abutting against the second shaft sealing ring 150.

[0005] Figure 1 illustrates a high-pressure fuel pump 100. The high-pressure fuel pump 100 comprises a housing 110, and a shaft 120 that is positioned within the housing 110. In the exemplary embodiment, the shaft 120 is adapted to rotate within the housing 110 to facilitate delivering pressurized fuel from a pumping chamber of the high-pressure fuel pump 100 to a fuel injector that is in flow communication with the pumping chamber of the high-pressure fuel pump 100. A flanged portion 130 is positioned proximate to the shaft 120 that is positioned within the housing 110 such that a clearance exists between the flanged portion 130 and the shaft 120. In an exemplary embodiment, a first shaft sealing ring 140 is positioned between the shaft 120 that is positioned within the housing 110 and the flanged portion 130 that is positioned proximate to the shaft 120 that is positioned within the housing 110. More specifically, the first shaft sealing ring 140 that is positioned between the shaft 120 that is positioned within the housing 110 and the flanged portion 130 that is positioned proximate to the shaft 120 that is positioned within the housing 110 facilitates sealing a clearance that is defined between the flanged portion 130 that is positioned proximate to the shaft 120, and the shaft 120 that is positioned within the housing 110. In an exemplary embodiment, a second shaft sealing ring 150 is positioned between the shaft 120 that is positioned within the housing 110 and the flanged portion 130 that is positioned proximate to the shaft 120 that is positioned within the housing 110. More specifically, the second shaft sealing ring 150 that is positioned between the shaft 120 that is positioned within the housing 110 and the flanged portion 130 that is positioned proximate to the shaft 120 that is positioned within the housing 110 facilitates sealing the clearance that is defined between the flanged portion 130 that is positioned proximate to the shaft 120 and the shaft 120 that is positioned within the housing 110. In addition, the second shaft sealing ring 150 that is positioned between the shaft 120 that is positioned within the housing 110 and the flanged portion 130 that is positioned proximate to the shaft 120 that is positioned within the housing 110 is positioned proximate to the first shaft sealing ring 140. In an exemplary embodiment, the second shaft sealing ring 150 is axially spaced apart from the first shaft sealing ring 140 such that a clearance is defined between the first shaft sealing ring 140 and the second shaft sealing ring 150.

[0006] In an exemplary embodiment, a groove 170 is defined through the flanged portion 130 and extends from an outer surface 180 of the flanged portion 130 to an inner surface 140 of the flanged portion 130 such that the groove 170 is positioned between the first shaft sealing ring 140 and the second shaft sealing ring 150 respectively. An anti-displacement pin 160 is inserted through the groove 170 that extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 such that the anti-displacement pin 160 is completely positioned within the groove 170 that extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130. More specifically, the anti-displacement pin 160 that is inserted through the groove 170 that extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 extends between and abuts against the first shaft sealing ring 140 and the second shaft sealing ring 150, and forms a wedge between the first shaft sealing ring 140 and the second shaft sealing ring 150 respectively. Therefore, the anti-displacement pin 160 that is inserted through the groove 170 that extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 extends between and abuts against the first shaft sealing ring 140 and the second shaft sealing ring 150 such that the first shaft sealing ring 140 is prevented from abutting against the second shaft sealing ring 150.

[0007] In an exemplary embodiment, the groove 170 that extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 is inclined with respect to a vertical axis. Therefore, the anti-displacement pin 160 that is inserted through the groove 170 extending from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 forms the wedge between the first shaft sealing ring 140 and the second shaft sealing ring 150. Therefore, the wedge that is formed by the anti-displacement pin 160 between the first shaft sealing ring 140 and the second shaft sealing ring 150 prevents the anti-displacement pin 160 from being withdrawn from the groove 170 that extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 due to mechanical vibrations or due to a movement of the first shaft sealing ring 140 and the second shaft sealing ring 150 away from one another. In an exemplary embodiment, the groove 170 that extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 at two diametrically opposite ends of the flanged portion 130. Therefore, an anti-displacement pin 160 that is inserted through a first groove 170 that extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 extends and is firmly wedged between the first shaft sealing ring 140 and the second shaft sealing ring 150 respectively. Moreover, the anti-displacement pin 160 that is inserted through a second groove 170 that extends from the outer surface 180 of the flanged portion 130 to the inner surface 140 of the flanged portion 130 extends and is firmly wedged between the first shaft sealing ring 140 and the second shaft sealing ring 150 respectively.

[0008] It must be understood that the embodiments explained above are only illustrative and do not limit the scope of the disclosure. Many modifications in the embodiments with regard to dimensions of various components are envisaged and form a part of this invention. The scope of the invention is only limited by the scope of the claims.
, Claims:We Claim

1. A high-pressure fuel pump (100), said high-pressure fuel pump (100) comprising:
a housing (110);
a shaft (120) positioned within said housing (110), said shaft (120) adapted to rotate within said housing (110) to facilitate delivering pressurized fuel from said high-pressure fuel pump (100) to a fuel injector;
a flanged portion (130) positioned proximate to said shaft (120) positioned within said housing (110);
a first shaft sealing ring (140) positioned between said shaft (120) positioned within said housing (110) and said flanged portion (130) positioned proximate to said shaft (120) that is positioned within said housing (110);
a second shaft sealing ring (150) positioned between said shaft (120) that is positioned within said housing (110) and said flanged portion (130) positioned proximate to said shaft (120) positioned within said housing (110), said second shaft sealing ring (150) positioned proximate to said first shaft sealing ring (140), wherein said second shaft sealing ring (150) is axially spaced apart from said first shaft sealing ring (140); characterized in that
an anti-displacement pin (160) inserted through a groove (170) extending from an outer surface (180) of the flanged portion (130) to an inner surface (140) of the flanged portion (130) such that said anti-displacement pin (160) extends between said first shaft sealing ring (140) and said second shaft sealing ring (150) such that said first shaft sealing ring (140) is prevented from abutting against said second shaft sealing ring (150).

2. The high-pressure fuel pump (100) in accordance with Claim 1, wherein the groove (170) that extends from the outer surface (180) of the flanged portion (130) to the inner surface (140) of the flanged portion (130) is inclined with respect to a vertical axis to facilitate said anti-displacement pin (160) that is inserted through the groove (170) extending from the outer surface (180) of the flanged portion (130) to the inner surface (140) of the flanged portion (130) to form a wedge between said first shaft sealing ring (140) and said second shaft sealing ring (150) and preventing said anti-displacement pin (160) from being withdrawn from the groove (170) that extends from the outer surface (180) of the flanged portion (130) to the inner surface (140) of the flanged portion (130).

3. The high-pressure fuel pump (100) in accordance with Claim 1, wherein the groove (170) that extends from the outer surface (180) of the flanged portion (130) to the inner surface (140) of the flanged portion (130) extends from the outer surface (180) of the flanged portion (130) to the inner surface (140) of the flanged portion (130) at two diametrically opposite ends of the flanged portion (130) to facilitate said anti-displacement pin (160) that is inserted through a first groove (170) that extends from the outer surface (180) of the flanged portion (130) to the inner surface (140) of the flanged portion (130) to extend between and abut against said first shaft sealing ring (140) and said second shaft sealing ring (150).

4. The high-pressure fuel pump (100) in accordance with Claim 1, wherein the groove (170) that extends from the outer surface (180) of the flanged portion (130) to the inner surface (140) of the flanged portion (130) extends from the outer surface (180) of the flanged portion (130) to the inner surface (140) of the flanged portion (130) at two diametrically opposite ends of the flanged portion (130) to facilitate said anti-displacement pin (160) that is inserted through a second groove (170) that extends from the outer surface (180) of the flanged portion (130) to the inner surface (140) of the flanged portion (130) to extend between a first shaft sealing ring (140) and a second shaft sealing ring (150).