High pressure piston pump actuating system using automotive starter system
View Patent ↗An apparatus for providing pressurized fuel for an engine includes an electric motor operative to crank said engine, a fuel pump, and a gear reduction device. This gear reduction device includes a worm and worm wheel and operates to receive a high speed input from said electric motor and to deliver a low speed output to said fuel pump.
1. An apparatus for providing pressurized fuel for an engine, comprising:
an electric motor operative to crank said engine;
a primary fuel pump mechanically driven by said engine;
a high pressure boost pump; and
a gear reduction device comprising a worm and worm wheel, said gear reduction device operative to receive a high speed input from said electric motor and deliver a low speed output to said high pressure boost pump;
wherein said primary fuel pump and said high pressure boost pump each provide said pressurized fuel for said engine.
2. The apparatus of claim 1 , wherein said gear reduction device further includes a cam comprising a lobe.
3. The apparatus of claim 2 , wherein said cam comprises a plurality of lobes.
4. The apparatus of claim 2 , wherein said cam comprises three lobes.
5. The apparatus of claim 2 , wherein said high pressure boost pump comprises a piston-type pump operatively linked to said cam.
6. The apparatus of claim 5 , wherein said high pressure boost pump further comprises a piston and a piston spring.
7. The apparatus of claim 6 , wherein said piston spring creates a bias in said piston in one direction, wherein said lobe on said cam creates a force pushing said piston in another direction, and wherein said bias and said force operate to cycle said piston.
8. The apparatus of claim 6 , wherein said high pressure boost pump further comprises a face plate attached to said piston, said face plate in constant sliding contact with said cam.
9. The apparatus of claim 1 , wherein said worm is fixedly attached to an output shaft of said electric motor.
10. The apparatus of claim 1 , wherein said worm is coupled to an output shaft of said electric motor.
11. An apparatus for providing pressurized fuel for an engine, comprising:
an electric motor operative to crank said engine;
an output shaft extending from said electric motor;
a worm driven by said output shaft;
a worm wheel mechanically contacted to said worm;
a drive shaft fixed to said worm wheel;
a primary fuel pump mechanically driven by said engine; and
a high pressure boost pump driven by said drive shaft;
wherein said primary fuel pump and said high pressure boost pump each provide said pressurized fuel for said engine.
12. The apparatus of claim 11 , further comprising a fuel pump driving mechanism operatively connected to said drive shaft and said high pressure boost pump.
13. The apparatus of claim 12 , wherein said high pressure boost pump comprises a piston-type fuel pump; and
wherein said fuel pump driving mechanism comprises a cam in operative contact with said piston-type fuel pump.
14. A method for providing pressurized fuel for an engine, comprising:
operating a primary fuel pump mechanically driven by said engine; and
coupling an electric motor operative to crank said engine to a high pressure boost pump through a worm gear;
wherein said primary fuel pump and said high pressure boost pump each provide said pressurized fuel for said engine.
15. The method of claim 14 , wherein said coupling comprises connecting an output shaft of said electric motor to an input mechanism of said high pressure boost pump.
16. The method of claim 15 , wherein said connecting comprises said output shaft powering a worm, said worm powering a worm wheel attached to a drive shaft, and said drive shaft powering said high pressure boost pump.
17. The method of claim 15 , wherein said connecting comprises said output shaft powering a worm, said worm powering a worm wheel attached to a drive shaft, said drive shaft powering a cam, and said cam powering said high pressure boost pump comprising a piston-type pump.