Claims:We Claim

1. A high pressure fuel pump (10), said high pressure fuel pump (10) comprising:
a housing (12);
a barrel (14) positioned within said housing (12) and secured to said housing (12);
a plunger (15) positioned within said barrel (14), said plunger (15) adapted to reciprocate within said barrel (14) to facilitate delivering pressurized fuel to a fuel injector;
a shaft sealing ring (16) positioned within said barrel (14), a first end of said shaft sealing ring (16) positioned against a washer (18), said washer (18) adapted to prevent said shaft sealing ring (16) from translating out of said barrel (14); characterized in that
a cir-clip (20) positioned against an opposite second end of said shaft sealing ring (16), said cir-clip (20) adapted to prevent said shaft sealing ring (16) from translating towards a top portion of said plunger (15).

2. The high pressure fuel pump (10) in accordance with Claim 1, wherein said cir-clip (20) is inserted within a groove (22) defined at the opposite second end of said shaft sealing ring (16) and adapted to abut against the opposite second end of said shaft sealing ring (16), said cir-clip (20) adapted to prevent said shaft sealing ring (16) from translating towards a top portion of said plunger (15).

3. The high pressure fuel pump (10) in accordance with Claim 2, wherein said cir-clip (20) comprises a C-shaped member that is inserted within the groove (22) defined at the opposite second end of said shaft sealing ring (16), an end of the C-shaped member of said cir-clip (20) adapted to prevent said shaft sealing ring (16) from translating towards the top portion of said plunger (15).
, 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 cir-clip, and more specifically to a cir-clip adapted to prevent translation of a shaft sealing ring in a high pressure fuel pump.

Background of the invention
[0002] IN 201941021454 describes a shaft sealing ring for a high pressure fuel pump. The shaft sealing ring comprises a first portion and a second portion that are secured together to form an integral assembly. A first lip is defined at a base of the first portion, and a second lip is defined at a base of the second portion. The first lip and the second lip are each adapted to abut against a pump shaft to prevent lubrication oil flowing on the pump shaft from entering into the high pressure fuel pump via a space defined between the first lip and the second lip.

Brief description of the accompanying drawings
[0003] Figure 1 illustrates a schematic diagram of a high pressure fuel pump depicting a shaft sealing ring integrated therein in one embodiment of the invention.

Detailed description of the embodiments
[0004] Figure 1 illustrates a schematic diagram of a shaft sealing ring 16 for a high pressure fuel pump 10. The high pressure fuel pump 10 comprises a housing 12, and a barrel 14 positioned within the housing 12 and secured to the housing 12. A plunger 15 is positioned within the barrel 14, the plunger 15 adapted to reciprocate within the barrel 14 to facilitate delivering pressurized fuel to a fuel injector. A shaft sealing ring 16 is positioned within the barrel 14, a first end of the shaft sealing ring 16 positioned against a washer 18. The washer 18 is adapted to prevent the shaft sealing ring 16 from translating out of the barrel 14. A cir-clip 20 is positioned against an opposite second end of the shaft sealing ring 16. The cir-clip 20 is adapted to prevent the shaft sealing ring 16 from translating towards a top portion of the plunger 15.
[0005] Figure 1 illustrates a schematic diagram of a shaft sealing ring 16 for a high pressure fuel pump 10. In an exemplary embodiment, the high pressure fuel pump 10 comprises a housing 12. A barrel 14 is positioned within the housing 12, and thereby secured to the housing 12. A plunger 15 is positioned within the barrel 14, wherein the plunger 15 is adapted to reciprocate within the barrel 14. The reciprocation of the plunger 15 within the barrel 14 of the high pressure fuel pump 10 facilitates delivering pressurized fuel to a fuel injector.

[0006] In an exemplary embodiment, a shaft sealing ring 16 is positioned within the barrel 14. The shaft sealing ring 16 is manufactured from a polytetrafluoroethylene (PTFE) based material. The shaft sealing ring 16 is adapted to form an integral assembly about its axis. More specifically, a first end of the shaft sealing ring 16 is positioned against a washer 18. The washer 18 is adapted to prevent the shaft sealing ring 16 from translating out of the barrel 14 by arresting its movement downwardly and out of the housing 12 of the high pressure fuel pump 10. A cir-clip 20 is positioned against an opposite second end of the shaft sealing ring 16 and abuts against an end portion of the shaft sealing ring 16. Due to the abutment of the cir-clip 20 against the shaft sealing ring 16, the shaft sealing ring 16 is prevented from translating upwardly towards a top portion of the plunger 15 as will be explained in further detail below.

[0007] In an exemplary embodiment, a groove 22 is defined at an opposite second end of the shaft sealing ring 16. The groove 22 that is defined at the opposite second end of the shaft sealing ring 16 is adapted to receive a cir-clip 20 therein. More specifically, the cir-clip 20 is compressed and therein inserted through the flanged portion 14 of the high pressure fuel pump 10. Therein, the cir-clip 20 is positioned within the groove 22 defined at the opposite second end of said shaft sealing ring 16. The cir-clip 20 is therein adapted to abut against the opposite second end of said shaft sealing ring 16. Therefore, the abutment of the opposite second end of the shaft sealing ring 16 against the cir-clip 20 prevents the shaft sealing ring 16 from translating towards a top portion of the plunger 15.

[0008] In an exemplary embodiment, the cir-clip 20 comprises a C-shaped member that is inserted within the groove 22 defined at the opposite second end of the shaft sealing ring 16. More specifically, the C-shaped member is inserted through the shaft portion of the housing 12 when the plunger 15 is disassembled from the housing 12. Therein, the C-shaped member is inserted through the groove 22 that is defined in the barrel 14 of the housing 12. Once the C-shaped member of the cir-clip 20 is inserted through the groove 22 that is defined in the barrel 14 of the housing 12, the cir-clip 20 is adapted to prevent the shaft sealing ring 16 from translating towards the top portion of the plunger 15. Therefore, the shaft sealing ring 16 is tightly gripped between the washer 18 at its bottom end portion and by the cir-clip 20 at its top end portion. Therefore, the shaft sealing ring 16 is prevented from translating towards the top portion of the plunger 15 or towards the bottom portion of the plunger 15 due to abrasive action between the shaft sealing ring 16 and the plunger 15 of the high pressure fuel pump 10.

[0009] A working of the shaft sealing ring 16 is described as an example. As the cir-clip 20 is positioned just above the shaft sealing ring 16, and the washer 18 is positioned just below the shaft sealing ring 16, the shaft sealing ring 16 is arrested from translating upwardly or downwardly with reference to a plunger 15 of the high pressure fuel pump 10. The cir-clip 20 that is positioned within the groove 22 that is defined in the barrel 14 arrests the translation of the shaft sealing ring 16 towards the top portion of the plunger 15 of the high pressure fuel pump 10. The cir-clip 20 is compressed and inserted within the groove that is defined in the barrel 14. After the compressive force is withdrawn, the cir-clip 20 expands and envelops the groove 22 that is defined in the barrel 14. As the cir-clip 20 is completely secured within the groove 22 that is defined in the barrel 14, the shaft sealing ring 16 is prevented from translating past the cir-clip 20 towards the top portion of the plunger 15 of the high pressure fuel pump 10. As the shaft sealing ring 16 is arrested from translating upwardly past the cir-clip 20 towards the top portion of the plunger 15, the vibrations that are induced within the barrel 14 of the high pressure fuel pump 10 due to the back and forth translation of the shaft sealing ring16 in the absence of the cir-clip 20 are prevented.

[0010] 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.