Field of the invention
[0001] This invention relates to a high pressure fuel pump and more particularly to
a plurality of fins that are each secured to a housing of the high pressure fuel pump.
Background of the invention
[0002] GB 1160664 A describes an intermittent combustion gas turbine engine and
fuel injectors. The invention relates to a rotary gas turbine engine of the intermittent combustion type, the engine comprising a circular casing comprising upper and lower portions secured together, a circular disc member having a rim portion of square cross-section being secured therein in the central plane. A shaft extends through the casing portions and the disc member, being rotatably supported in bearings, the shaft portion above the casing being utilized for driving engine auxiliaries and portion below the casing being utilized for supplying power. A series of combustion chambers or cells are formed in the rim of the disc, there being five such chambers in the embodiment described, each chamber being connected to an intake opening at the upper side of the disc by an intake passage of convergent form, and to an outlet opening at the lower side of the disc by an outlet passage of divergent form, the passages being inclined as indicated in Fig. 6. Each combustion chamber is provided with a fuel injection device and an igniter. An arm is secured to the shaft above the disc and an arm is secured to the shaft below the disc, the two end portions of the arm co-operating with the air intake openings to open and close them, the portions being formed with scoops to augment the flow of air into the intakes. The two end portions of the arm are formed with flat portions and with V-shaped fins which co-operate with the outlet openings to open and close them. The arrangement is such that as the arm rotates it forces air through an opening and then closes the opening, the outlet opening being closed simultaneously by the portion of arm. Fuel is then injected into the combustion chamber through injector and the fuel and air mixture is fired by the igniter, the resulting combustion gases discharging through outlet on to the V-section fins whereby the arm is rotated.

Brief description of the accompanying drawing
[0003] Figure 1 illustrates a schematic diagram of a high pressure fuel pump in one
embodiment of the invention.
Detailed description of the invention
[0004] Figure 1 illustrates a high pressure fuel pump 10 for a fuel injection system.
The high pressure fuel pump 10 comprises a housing 12, the housing 12 comprising a circular pump body 14 and a flanged portion 16 integrally formed with the circular pump body 14. A plurality of fins 18 are secured to the circular pump body 14, each of the plurality of fins 18 adapted to transfer heat out of the housing 12 of the high pressure fuel pump 10.
[0005] The high pressure fuel pump 10 comprises a housing 12. The housing 12
comprises a circular pump body 14. The components of the high pressure fuel pump 10 such as a cam, roller tappet, oil lubricated bearings, and the like are housed within the circular pump body 14 of the high pressure fuel pump 10. A flanged portion 16 is secured to the circular pump body 14 and contains the piston that reciprocates and delivers pressurized fuel from the high pressure fuel pump 10.
[0006] A plurality of fins 18 are secured to the circular pump body 14. In an
exemplary embodiment, each of the plurality of fins 18 are integrally cast with the housing 12 of the circular pump body 14. In an alternate exemplary embodiment, each of the plurality of fins 18 are removably coupled to the housing 12 of the circular pump body 14. The plurality of fins 18 are circumferentially coupled to the circular pump body 14 to facilitate dissipating the heat from the circular pump body 14.
[0007] In an exemplary embodiment, each of the plurality of fins 18 may be
manufactured from the same material as that of the housing 12 of the circular pump body 14. In an alternate exemplary embodiment, each of the plurality of fins 18 may be manufactured from a material of a higher thermal conductivity than that of the housing 12 of the circular pump body 14 to facilitate transferring heat out of the housing 12 of the high pressure fuel pump 10.

[0008] Due to the plurality of fins 18 being located on the housing 12 of the high
pressure fuel pump 10, the hydraulic efficiency of the high pressure fuel pump 10 may be improved. Moreover, the plurality of fins 18 that are secured to the circular pump body 14 facilitates enhancing a life of oil lubricated bearings in addition to a cam and roller interface that are present in the circular pump body 14. Due to the heat being withdrawn away from the housing 12 of the high pressure fuel pump 10, the life of the oil lubricated bearings in addition to the cam and roller interface that are present in the circular pump body 14 may be enhanced. Also, as the heat is being withdrawn away from the housing 12 of the high pressure fuel pump 10, the life of the lubrication oil that is present in the high pressure fuel pump 10 is significantly enhanced. Finally, since the plurality of fins 18 are secured to the circular pump body 14, a size of an intercooler that performs the function of heat removal from the fuel, and that is coupled downstream from the high pressure fuel pump 10 may be reduced.
[0009] 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 leverage and dimensions of various components are envisaged and form a part of this invention. The scope of the invention is only limited by the claims.

CLAIMS
We Claim
1. A high pressure fuel pump (10) for a fuel injection system, said high pressure fuel
pump (10) comprising:
a housing (12), said housing (12) comprising a circular pump body (14) and a flanged
portion (16) integrally formed with said circular pump body (14); and
a plurality of fins (18) secured to said circular pump body (14), each of said plurality of
fins (18) adapted to transfer heat out of said housing (12) of said high pressure fuel pump
(10).
2. The high pressure fuel pump (10) in accordance with Claim 1 wherein the plurality of fins (18) secured to said circular pump body (14) facilitates improving the hydraulic efficiency of said high pressure fuel pump (10).
3. The high pressure fuel pump (10) in accordance with Claim 1 wherein the plurality of fins (18) secured to said circular pump body (14) facilitates enhancing a life of oil lubricated bearings in addition to a cam and roller interface present within said circular pump body (14) of said high pressure fuel pump (10).
4. The high pressure fuel pump (10) in accordance with Claim 1 wherein the plurality of fins (18) secured to said circular pump body (14) facilitates enhancing the lubrication oil life that is present in said circular pump body (14) of said high pressure fuel pump (10).
5. The high pressure fuel pump (10) in accordance with Claim 1 wherein the plurality of fins (18) secured to said circular pump body (14) facilitates a reduction in a size of an intercooler that is in flow communication downstream from said high pressure fuel pump (10).