Field of the invention
[0001] This invention relates to a high pressure fuel pump, and more specifically to a multipurpose spring retainer for the high pressure fuel pump.
Background of the invention
[0002] CN 106762273 A describes a high pressure fuel pump lubricated through engine oil. The high pressure fuel pump lubricated through the engine oil comprises a pump body, a cam shaft, a driving part, one or more plunger pairs, and tappet bodies corresponding to the plunger pairs. The high pressure fuel pump comprises an engine oil lubricating mechanism. The engine lubricating mechanism comprises an engine oil inlet pipe and an engine oil outlet pipe which are formed in the pump body, and pump grooves formed in the portions, making contact with the outer walls of the tappet bodies, of the pump body. The engine oil inlet pipe is divided into two branches in the pump body, the first branch is connected with a pump body engine oil cavity in the pump body, and the second branch is connected with the pump body grooves. The outer side walls of the tappet bodies are provided with oil way holes used for communicating with tappet body cavities. The oil way holes intermittently communicate with the pump body grooves along with vertical movement of the tappet bodies. The tappet body cavities communicate with the pump body engine oil cavity through oil discharging channels. The engine oil outlet pipe communicates with the pump body engine oil cavity. The high pressure fuel pump lubricated through the engine oil further comprises a plunger sealing mechanism. By arranging the engine oil lubricating mechanism and the plunger sealing mechanism, the engine oil lubricating performance is improved, and mixing of engine oil and fuel oil is greatly limited.
Brief description of the accompanying drawing
[0003] Figure 1 illustrates a schematic diagram of a multipurpose spring retainer for a high pressure fuel pump in one embodiment of the invention.

Detailed description of the embodiments
[0004] Figure 1 illustrates a high pressure fuel pump 10. The high pressure fuel pump 10 comprises a governor housing 11, and a lubrication oil supply path 24 extending from the governor housing 11, the lubrication oil supply path 24 adapted to supply lubrication oil to a governor housing 26, a cam chamber, and a clearance defined between a roller tappet and the governor housing 11 of the high pressure fuel pump 10. A multipurpose spring retainer 30 is adapted to close the lubrication oil supply path 24, the multipurpose spring retainer 30 facilitates channeling lubrication oil from an external source to the governor housing 26, the cam chamber, and the clearance defined between the roller tappet and the governor housing 11. The multipurpose spring retainer 30 comprises a first portion 18 comprising a plurality of external screw threads that are defined on an outer periphery of the first portion 18, the first portion 18 adapted to be secured to the governor housing 26 by screwing the first portion 18 of the multipurpose spring retainer 30 to the governor housing 26, and wherein the first portion 18 is adapted to retain a spring (not shown) within the first portion 18. A second portion 20 comprising a solid portion extends from the first portion 18, the second portion 20 having a diameter that is greater than a diameter of the first portion 18, the second portion 20 having a through hole 16 defined there through, wherein the through hole 16 comprises a plurality of internal screw threads that are defined along an axial length of the second portion 20, and wherein the second portion 20 is adapted to channel lubrication oil to the governor housing 26, the cam chamber, and the clearance defined between the roller tappet and the governor housing 11 via the first portion 18.
[0005] The high pressure fuel pump 10 comprises a governor housing 11. In the exemplary embodiment, a lubrication oil supply path 24 extends from the governor housing 11. The lubrication oil supply path 24 that extends from the governor housing

11 receives lubrication oil from an external source, wherein the lubrication oil is required to be channeled to the high pressure fuel pump 10. More specifically, the lubrication oil supply path that extends from the governor housing 11 receives lubrication oil from an external source and channels the lubrication oil to a governor housing 26, a cam chamber, and a clearance that is defined between a roller tappet and the governor housing 11 of the high pressure fuel pump 10. Therefore, before the high pressure fuel pump 10 is officially deployed in the field, the governor housing 26, the cam chamber, and the clearance defined between the roller tappet and the governor housing 11 of the high pressure fuel pump 10 may be adequately lubricated by the lubrication oil. Once the governor housing 26, the cam chamber, and the clearance defined between the roller tappet and the governor housing 11 of the high pressure fuel pump 10 are adequately lubricated, the high pressure fuel pump 10 may be filled with incoming fuel from a fuel tank and thereby adapted to deliver pressurized fuel to an internal combustion engine.
[0006] In an exemplary embodiment, a multipurpose spring retainer 30 is adapted to close the lubrication oil supply path by a fastening means that is secured to its end portion. The multipurpose spring retainer 30 facilitates channeling lubrication oil from an external source to the governor housing 26, the cam chamber, and the clearance that is defined between the roller tappet and the governor housing 11 as will be explained in further detail below. The constructional features of the multipurpose spring retainer 30 will be explained in more detail in the following paragraph.
[0007] The multipurpose spring retainer 30 comprises a first portion 18 comprising a plurality of external screw threads that are defined on an outer periphery of the first portion 18. Therefore, the plurality of external screw threads that are defined on the outer periphery of the first portion 18 of the multipurpose spring retainer 30 is adapted to be secured to the governor housing 26 by screwing the first portion 18 of the

multipurpose spring retainer 30 to the governor housing 26. Once the plurality of external screw threads that are defined on the outer periphery of the first portion 18 of the multipurpose spring retainer 30 is screwed on to the governor housing 26, the first portion of the multipurpose spring retainer 30 is firmly retained within the governor housing 26 to facilitate channeling lubrication oil within the governor housing 26. In the exemplary embodiment, the first portion 18 of the multipurpose spring retainer 30 is adapted to retain a spring (not shown) within the first portion 18. A second portion 20 comprising a solid non-threaded portion extends axially from the first portion 18 and forms an integral portion of the multipurpose spring retainer 30. The second portion 20 has a diameter that is greater than a diameter of the first portion.
[0008] In an exemplary embodiment, the second portion 20 of the multipurpose spring retainer 30 comprises a through hole 16 that is defined therethrough. More specifically, the second portion 20 of the multipurpose spring retainer 30 comprises a plurality of internal screw threads that are defined along an axial length of the through hole 16 of the second portion 20. The second portion 20 of the multipurpose spring retainer 30 is adapted to channel lubrication oil to the governor housing 26, the cam chamber, and the clearance that is defined between the roller tappet and the governor housing 11 via the first portion 18. More specifically, the lubrication oil that is channeled to the second portion 20 is channeled through the through hole 16 that is defined in the second portion 20 before the lubrication oil is channeled to the governor housing 26, the cam chamber, and the clearance that is defined between the roller tappet and the governor housing 11 via the first portion 18.
[0009] The high pressure fuel pump 10 further comprises a washer 14 that is positioned on the through hole 16 that is defined on the second portion 20. In an exemplary embodiment, the washer 14 is manufactured from a copper based material. In an alternate exemplary embodiment, the washer 14 may be manufactured from any

material that is known in the art that facilitates securing a screw plug 12 to the second portion 20 of the multipurpose spring retainer 30 as will be explained in more detail below.
[0010] In an exemplary embodiment, the high pressure fuel pump 10 comprises a screw plug 12 that comprises a plurality of external screw threads that are defined on an outer periphery of the screw plug 12. The screw plug 12 is inserted within the through hole 16 of the second portion 20 of the multipurpose spring retainer 30 such that the external screw threads that are defined on the outer periphery of the screw plug 12 mesh against the plurality of internal screw threads that are defined along the axial length of the second portion 20. The meshing between the screw threads that are defined on the outer periphery of the screw plug 12 mesh against the plurality of internal screw threads that are defined along the axial length of the second portion 20 facilitates securing the screw plug 12 to the second portion 20, and preventing lubrication oil from an external source from being channeled into the multipurpose spring retainer 30. When the screw plug 12 is removed from the multipurpose spring retainer 30 by unscrewing the screw plug 12 from the second portion 20, lubrication oil may be channeled through the through hole 16 that is defined in the second portion 20 and finally into the governor housing 26, the cam chamber, and the clearance that is defined between the roller tappet and the housing 26 via the first portion 18. The washer 14 that is positioned on the through hole 16 that is defined on the second portion 20 facilitates sealing the interface between the screw plug 12 and the second portion 20 of the multipurpose spring retainer 30. Therefore, the washer 14 that is positioned on the through hole 16 that is defined on the second portion 20 facilitates sealing the interface between the screw plug 12 and the second portion 20 of the multipurpose spring retainer 30. The washer 14 thus prevents a leakage of lubrication oil between the second portion 20 of the multipurpose spring retainer 30 and the screw plug 12.

[0011] A working of the multipurpose spring retainer 30 for the high pressure fuel pump 10 is described as an example. In the assembled condition, the multipurpose spring retainer 30 comprising the first portion 18 and the second portion 20 are positioned within the governor housing 26 by screwing the first portion 18 onto the governor housing 26. The screw plug 12 is screwed onto the through hole 16 that is defined in the second portion 20 with the washer 14 therebetween for preventing the lubrication oil from flowing out of the governor housing 26 as well as for preventing the lubrication oil from an external source from being filled into the high pressure fuel pump 10. When it is required to fill lubrication oil into the high pressure fuel pump 10, the screw plug 12 is unscrewed from the through hole 16 and the washer 14 is thereby removed from the through hole 16 that is defined in the second portion 20. Lubrication oil from an external source is filled via the second portion 20. More specifically, the lubrication is oil that is filled via the second portion 20 is channeled to the governor housing 26, the cam chamber, and the clearance defined between said roller tappet and the governor housing 11 via the first portion 18. Once the lubrication oil is completely filled within the high pressure fuel pump 10, the washer 14 is replaced against the through hole 16 that is defined in the second portion 20 and the screw plug 12 is screwed within the internal threads that are defined within the through hole 16 that is defined within the second portion 20. The screw plug 12 that is screwed within the internal threads that are defined within the through hole 16 that is defined within the second portion 20 prevents lubrication oil from an external source from being channeled to the governor housing 26, the cam chamber, and the clearance defined between said roller tappet and the governor housing 11 via the first portion 18.
[0012] 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 (10), said high pressure fuel pump (10) comprising: a governor housing (11);
a lubrication oil supply path (24) extending from said governor housing (11), said lubrication oil supply path (24) adapted to supply lubrication oil to a governor housing (26), a cam chamber, and a clearance defined between a roller tappet and said housing (12) of said high pressure fuel pump (10); characterized in that
a multipurpose spring retainer (30) adapted to close the lubrication oil supply path (24), said multipurpose spring retainer (30) facilitates channeling lubrication oil from an external source to said governor housing (26), the cam chamber, and the clearance defined between said roller tappet and said housing (26), said multipurpose spring retainer (30) comprising:
a first portion (18) comprising a plurality of external screw threads that are defined on an outer periphery of said first portion (18), said first portion (18) adapted to be secured to said governor housing (26) by screwing said first portion (18) of said multipurpose spring retainer (30) to said governor housing (26), and wherein said first portion (18) is adapted to retain a spring therein; and
a second portion (20) comprising a solid portion extending from the first portion (18), the second portion (20) having a diameter that is greater than a diameter of the first portion (18), said second portion (20) having a through hole (16) defined therethrough, wherein the through hole (16) comprises a plurality of internal screw threads that are defined along an axial length of said second portion (20), and wherein said second portion (20) is adapted to channel

lubrication oil to the governor housing (26), the cam chamber, and the clearance defined between said roller tappet and said housing (12) via the first portion (18).
2. The high pressure fuel pump (10) in accordance with Claim 1 further comprising a washer (14) positioned on the through hole (16) that is defined on said second portion (20), said washer (14) manufactured from a copper based material.
3. The high pressure fuel pump (10) in accordance with Claim 2 further comprising a screw plug (12) that comprises a plurality of external screw threads that are defined on an outer periphery of said screw plug (12) positioned against said washer (14) and inserted within the through hole (16) of said second portion (20) such that the plurality of external screw threads that are defined on the outer periphery of said screw plug (12) meshes against the plurality of internal screw threads that are defined along the axial length of said second portion (20) to facilitate securing said screw plug (12) to said second portion (20).
4. The high pressure fuel pump (10) in accordance with Claim 3 wherein said washer (14) facilitates sealing an interface between said screw plug (12) and said second portion (20) of said multipurpose spring retainer (30).
5. A multipurpose spring retainer (30), said multipurpose spring retainer (30) adapted to:
close a lubrication oil supply path (24) of a high pressure fuel pump (10), said multipurpose spring retainer (30) facilitates channeling lubrication oil from an external source to a governor housing (26), a cam chamber, and a clearance

that is defined between a roller tappet and a housing (12) of said high pressure fuel pump (10), said multipurpose spring retainer (30) comprising:
a first portion (18) comprising a plurality of external screw threads that are defined on an outer periphery of said first portion (18), the first portion (18) adapted to be secured to said governor housing (26) by screwing the first portion (18) of said multipurpose spring retainer (30) to said governor housing (26), and wherein said first portion (18) is adapted to retain a spring therein; and
a second portion (20) comprising a solid portion extending from the first portion (18), the second portion (20) having a diameter that is greater than a diameter of the first portion (18), said second portion (20) having a through hole (16) defined therethrough, wherein the through hole (16) comprises a plurality of internal screw threads that are defined along an axial length of said second portion (20), and wherein said second portion (20) is adapted to channel lubrication oil to the governor housing (26), the cam chamber, and the clearance defined between said roller tappet and said housing (11) via the first portion (18).
6. The multipurpose spring retainer (30) in accordance with Claim 5 further comprising a washer (14) positioned on the through hole (16) that is defined on said second portion (20), said washer (14) manufactured from a copper based material.
7. The multipurpose spring retainer (30) in accordance with Claim 6 further comprising a screw plug (12) that comprises a plurality of external screw threads that are defined on an outer periphery of said screw plug (12) positioned against said washer (14) and inserted within the through hole of said second portion (20) such that the plurality of external screw threads that are

defined on the outer periphery of said screw plug (12) mesh against the plurality of internal screw threads that are defined along the axial length of said second portion (20) to facilitate securing said screw plug (12) to said second portion (20).
8. The multipurpose spring retainer (30) in accordance with Claim 7 wherein said
washer (14) facilitates sealing an interface between said screw plug (12) and said second portion (20) of said multipurpose spring retainer (30).