Claims
- 1. A fuel delivery system comprising:
a fuel reservoir connected to a suction side of a pump, a fuel delivery line connected to an output side of said pump, a number of fuel injectors connected to said delivery line, and a return line from said number of injectors to said suction side of said pump, said pump comprising: a housing, a pumping chamber within said housing, a driver rotor and a driven rotor within said pumping chamber, and an input shaft to said housing, said input shaft being arranged such that rotation of said input shaft effects rotation of said driver rotor, said driver rotor being caused to rotate by said input shaft via a magnetic coupling, wherein said magnetic coupling is arranged to slip when a predetermined value of torque is applied across the coupling such that a maximum pressure value of about 12 bar is attained at said output side of said pump.
- 2. The fuel delivery system as claimed in claim 1, wherein said magnetic coupling is arranged to slip such that a maximum pressure of about 9 bar is attained at said output side of said pump.
- 3. The fuel delivery system as claimed in claim 1, said system further comprising a pressure relief valve in said fuel delivery line, said pressure relief valve being arranged to reduce the pressure in said fuel delivery line to about 6 bar.
- 4. The fuel delivery system as claimed in claim 3, further comprising a fuel filter wherein said fuel filter provided in said delivery line downstream of said pressure relief valve.
- 5. The fuel delivery system as claimed in claim 1, wherein said magnetic coupling of said pump comprises a first magnet holder assembly attached to said input shaft, and a second magnet holder assembly attached to a carrier shaft carrying said driver rotor, each said magnet holder assembly comprising an annular magnet holder, preferably of aluminum, having a peripheral wall, an inner wall and at least three dividing walls extending radially from said inner wall to said outer wall to define a number of compartments, each compartment being adapted to house a pair of magnets.
- 6. The fuel delivery system as claimed in claim 5, wherein each said magnet holder assembly further comprises a backing plate of magnetic material to which each said pair of magnets is adhered.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9803864-6 |
Nov 1998 |
SE |
|
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This is a continuation patent application of International Application Number PCT/SE99/02041 filed Nov. 10, 1999 and which designates the United States; the disclosure of that application is expressly incorporated by reference in its entirety.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/SE99/02041 |
Nov 1999 |
US |
Child |
09681626 |
May 2001 |
US |