Claims:We claim:
1. A high pressure fuel pump (1), said high pressure fuel pump (1) comprising:
a rotor (10);
a housing (12) comprising a stator (14, 16) concentrically positioned within said rotor (10), and wherein said rotor (10) rotates about said housing (12);
a first piston (18) and a second piston (20) positioned between a first arm and a second arm of said stator (14,16); and
a first permanent magnet (22) coupled to an end of said first piston (18), and a second permanent magnet (24) coupled to an end of said second piston (20), and wherein said first permanent magnet (22) and said second permanent magnet (24) facilitate translating said first piston (18) and said second piston (20) to deliver fuel from said high pressure fuel pump (1).

2. The high pressure fuel pump (1) in accordance with Claim 1 further comprising a first spring element (26) coupled between said first permanent magnet (22) and said stator (14,16).

3. The high pressure fuel pump (1) in accordance with Claim 1 further comprising a second spring element (30) coupled between said second permanent magnet (24) and said stator (14,16).

4. The high pressure fuel pump (1) in accordance with Claim 1 further comprising a third spring element (34) coupled between said first permanent magnet (22) and said housing (12), said third spring element (34) prevents said first permanent magnet (22) from contacting said housing (12).

5. The high pressure fuel pump (1) in accordance with Claim 1 further comprising a fourth spring element (36) coupled between said second permanent magnet (24) and said housing (12), said fourth spring element (36) prevents said second permanent magnet (24) from contacting said housing (12).

6. The high pressure fuel pump (1) in accordance with Claim 1 wherein an inner portion of said rotor (10) is designed such that said rotor (10) facilitates delivering pressurized fuel from said high pressure fuel pump (1) by means of said first piston (18) and said second piston (20) once in every ninety degree rotation of said rotor (10).

7. The high pressure fuel pump (1) in accordance with Claim 1 wherein said rotor (10) comprises four lobes that are each arranged circumferentially about said rotor (10).

8. The high pressure fuel pump (1) in accordance with Claim 1 wherein a fuel inlet and fuel outlet of said high pressure fuel pump (1) are located proximate to an end of said first piston (18) and said second piston (20) of said high pressure fuel pump (1). , Description:Field of the invention:
[0001] This disclosure relates to a high pressure fuel pump, and more particularly to an apparatus for actuating pistons of the high pressure fuel pump by means of electro-magnetic induction.

Background of the invention:
[0002] IN Patent Application Number 201641010315 describes a high pressure fuel pump that is positioned within a bore of an engine block. The high pressure fuel pump comprises a pump housing that is coupled to the engine block. A plunger is provided within a bore defined within the pump housing, wherein the plunger is adapted to reciprocate within the bore of the pump housing. A permanent magnet is coupled to the plunger. At least one electromagnet is positioned proximate to the permanent magnet and secured to the engine block. The permanent magnet is attracted and repelled to the at least one electromagnet by actuation of the at least one electromagnet to facilitate reciprocating the plunger within the bore of the pump housing.

Brief description of the accompanying drawings:
[0003] An embodiment of the disclosure is described with reference to the following accompanying drawings:
[0004] Figure 1 illustrates a high pressure fuel pump in accordance with this disclosure.
[0005] Figure 2 illustrates a front view of the high pressure fuel pump that is coupled to an engine.

Detailed description of the embodiments:
[0006] A high pressure fuel pump 1 is described. The high pressure fuel pump 1 comprises a rotor 10. A housing 12 comprising a stator 14,16 is concentrically positioned within the rotor 10, and wherein the rotor 10 rotates about the housing 12. A first piston 18 and a second piston 20 is positioned between a first arm and a second arm of the stator 14, 16. A first permanent magnet 22 is coupled to an end of the first piston 18, and a second permanent magnet 24 is coupled to an end of the second piston 20, and wherein the first permanent magnet 22 and the second permanent magnet 24 facilitate translating the first piston 18 and the second piston 20 to deliver fuel from the high pressure fuel pump 1.
[0007] Figure 1 illustrates a rotor 10 of a high pressure fuel pump 1. The rotor 10 includes an outer periphery that is circular in shape. An inner periphery of the rotor 10 includes a clover shaped portion that is cut in the rotor 10. A housing 12 is positioned within the clover shaped portion that is cut out in the rotor 10. The clover shaped portion includes a first portion 13 that is farther away from the housing 12, and a second portion 15 that is closer to the housing 12. A stator 14,16 is coupled to the housing 12 at its first end portion. A first piston 18 is positioned between a first arm and a second arm of the stator 14,16 respectively. Similarly, a second piston 20 is positioned between the first arm and the second arm of the stator 14,16 respectively. The rotor 10 of the high pressure fuel pump 1 includes a plurality of coils that are in electromagnetic communication with the stator 14,16 of the housing 12. The rotor 10 of the high pressure fuel pump 1 includes a bush (not shown) that is in point contact with the rotor 10. The point contact between the bush and the rotor 10 causes the plurality of coils that are in electromagnetic communication with the stator 14,16 of the housing 12 to be supplied with electric power. The stator 14, 16 facilitate magnetizing the rotor 10 of the high pressure fuel pump 1 as will be explained in more detail below.
[0008] A first permanent magnet 22 is secured to an end portion of the first piston 18. Specifically, the first permanent magnet 22 is secured to the end portion of the first piston 18 using any fastening means that is known in the art. A second permanent magnet 24 is secured to an end portion of the second piston 20. Specifically, the second permanent magnet 24 is secured to the end portion of the second piston 20 using any fastening means known in the art. The first permanent magnet 22 and the second permanent magnet 24 each facilitate reciprocating the first piston 18 and the second piston 20 respectively.
[0009] A first spring 26 is positioned between the first permanent magnet 22 and the stator 14,16. The first spring 26 facilitates translating the first piston 18 during the intake/suction stroke of the high pressure fuel pump 1. A second spring 30 is positioned between the second permanent magnet 24 and the stator 14,16. The second spring 30 facilitates translating the second piston 20 during the intake/suction stroke of the high pressure fuel pump 1.
[00010] The rotor 10 of the high pressure fuel pump 1 includes a third spring 34. The third spring 34 is coupled between the first permanent magnet 22 and the housing 12. When the first piston 18 translates during a suction stroke of the high pressure fuel pump 1, the third spring 34 prevents the first permanent magnet 22 from contacting the housing 12. The rotor 10 of the high pressure fuel pump 1 includes a fourth spring 36. The fourth spring 36 is coupled between the second permanent magnet 24 and the housing 12. When the second piston 20 translates during a suction stroke of the high pressure fuel pump 1, the fourth spring 36 prevents the second permanent magnet 24 from contacting the housing 12.
[00011] Figure 2 illustrates a front view of a high pressure fuel pump 1 that is secured to a portion of an engine 39. The high pressure fuel pump 1 includes a housing 40. The housing 40 is coupled to the engine 39 by means of coupling 42 and coupling 44. The housing 40 further includes the stator 14 that is coupled to the housing 40 at its one end and facilitates securing the stator 14. The rotor 10 circumscribes the stator 14 and is coupled to a crank shaft 46 of the engine 39. The crank shaft 46 of the engine 39 supplies mechanical power to the rotor 10 by means of a coupling member 48. The coupling member 48 secures the rotor 10 to the crank shaft 46 of the engine 39.
[00012] The working of the rotor 10 of the high pressure fuel pump 1 is described as an example. When the crankshaft 46 rotates the rotor 10, the first portion 13 of the rotor 10 moves away from the first permanent magnet 22. Therein, the second portion 15 of the rotor 10 is closer to the first permanent magnet 22. During the rotation of the rotor 10 from the first portion 13 to the second portion 15, the strength of the magnetic field between the rotor 10 and the permanent magnet 22 increases. When the second portion 15 of the rotor 10 is closest to the first permanent magnet 22, the strength of the magnetic field between the rotor 10 and the first permanent magnet 22 is maximum. Similarly, when the rotor 10 rotates, the first portion 13 moves away from the second permanent magnet 24. Therein, the second portion 15 of the rotor 10 is closer to the second permanent magnet 24. During the rotation of the rotor 10 from the first portion 13 to the second portion 15, the strength of the magnetic field between the rotor 10 and permanent magnet 24 increases. When the second portion 15 of the rotor 10 is closest to the second permanent magnet 24, the strength of the magnetic field between the rotor 10 and the second permanent magnet 24 is maximum. During this phase, the first permanent magnet 22 is repelled by the rotor 10, thereby causing the first piston 18 to translate towards the fuel delivery side of the high pressure fuel pump 1 against the resistive force of the spring 26. The translation of the piston 18 causes compression of fuel within the cylinder of the high pressure fuel pump 1. The compressed fuel is delivered out of the high pressure fuel pump 1 via the cylinder in which the first piston 18 translates. Simultaneously, during this phase, the second permanent magnet 24 is repelled by the rotor 10, thereby causing the second piston 20 to translate towards the fuel delivery side of the high pressure fuel pump 1 against the resistive force of the second spring 30. The translation of the piston 20 causes compression of fuel within the cylinder of the high pressure fuel pump 1. The compressed fuel is delivered out of the high pressure fuel pump 1 via the cylinder in which the second piston 20 translates.
[00013] During the suction stroke of the high pressure fuel pump 1, the rotor 10 rotates from the second portion 15 back to the first portion 13. During this phase, the first spring element 26 applies a tensile force on the first piston 18, thereby causing the first piston 18 to translate away from the fuel delivery side of the high pressure fuel pump 1. The translation of the piston 18 causes compression of the third spring 34 of the high pressure fuel pump 1. Simultaneously, during this phase the second spring element 30 applies a tensile force on the second piston 20, thereby causing the second piston 20 to translate away from the fuel delivery side of the high pressure fuel pump 1. The translation of the second piston 20 causes compression of the fourth spring 36 of the high pressure fuel pump 1. The third spring 34 facilitates preventing the first permanent magnet 22 from contacting the housing 12 during the suction stroke of the high pressure fuel pump 1. Similarly, the fourth spring 36 facilitates preventing the second permanent magnet 24 from contacting the housing 12 during the suction stroke of the high pressure fuel pump 1.
[00014] The high pressure fuel pump 1 containing the first piston 18 and the second piston 20, and the stator 14,16 facilitates decreasing the inertia of the high pressure fuel pump 1, while at the same time providing a more responsive reciprocating motion of the first piston 18 and the second piston 20 respectively. Moreover, as there is no contact between the first piston 18, the second piston 20, and the stator 14,16, there are no frictional energy losses developed in the high pressure fuel pump 1.
[00015] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.