Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
  • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
  • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
  • F04C15/008—Prime movers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
  • F04C2/084—Toothed wheels
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2230/00—Manufacture
  • F04C2230/90—Improving properties of machine parts
  • F04C2230/91—Coating
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
  • F05C2201/00—Metals
  • F05C2201/04—Heavy metals
  • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
  • F05C2201/0466—Nickel

Definitions

• the present invention relates to a pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine.
• fuel preferably diesel fuel
• the pre-feed pump is an electric gear pump comprising a pump body, and a synchronous, brushless, permanent-magnet, electric motor housed inside said pump body.
• the rotor has inner teeth and defines an outer gear of the gear pump which further comprises an annular-shaped inner gear seated inside the rotor.
• the inner gear is mounted so as to rotate about an axis of rotation which is eccentric with respect to the axis of rotation of the rotor and has outer teeth meshing with the inner teeth of said rotor.
• the object of the present invention is to provide a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, which does not have the aforementioned drawbacks and is simple and inexpensive to produce.
• FIG 2 is an exploded perspective view of a detail of the pump unit according to Figure 1;
• Figure 3 is a front view of a detail of Figure 2.
• 1 denotes in its entirety a pump unit for feeding fuel, preferably diesel fuel, from a storage tank 2 to an internal combustion engine 3, in the case in question a diesel combustion engine comprising a fuel distribution manifold 4, commonly referred to by the term “common rail”, and a plurality of injectors 5 connected to the manifold 4 and designed to atomize the fuel inside associated combustion chambers (not shown) of the said engine 3.
• fuel preferably diesel fuel
• common rail commonly referred to by the term "common rail”
• injectors 5 connected to the manifold 4 and designed to atomize the fuel inside associated combustion chambers (not shown) of the said engine 3.
• the pistons 10 are displaced along the associated cylinders 8 by an actuating device 11 of the known type housed inside the pump body 9 with an alternating rectilinear movement comprising an outward stroke for drawing the fuel into the associated cylinders 8 and a return stroke for compressing the fuel contained in said associated cylinders 8.
• the pump unit 1 further comprises a hydraulic circuit 12 for feeding the fuel comprising, in turn, a first branch 13 for connecting together the tank 2 and the pump 7; a second branch 14, which connects together the pumps 6 and 7, extends through the pump body 9 in order to lubricate the actuating device 11 and is connected to each cylinder 8 by means of an associated intake valve 15; and a third branch 16 which extends between the pump 6 and the manifold 4 and is connected to each cylinder 8 by means of an associated delivery valve 17.
• a hydraulic circuit 12 for feeding the fuel comprising, in turn, a first branch 13 for connecting together the tank 2 and the pump 7; a second branch 14, which connects together the pumps 6 and 7, extends through the pump body 9 in order to lubricate the actuating device 11 and is connected to each cylinder 8 by means of an associated intake valve 15; and a third branch 16 which extends between the pump 6 and the manifold 4 and is connected to each cylinder 8 by means of an associated delivery valve 17.
• the circuit 12 further comprises a fourth branch 21 which extends between the manifold 4 and the tank 2 and is provided with a metering electrovalve 22 which cooperates with the electrovalve 19 in order to control selectively the fuel flow fed to the injectors 5 and allows the amount of fuel exceeding that required by the injectors 5 to be discharged into the tank 2.
• the rotor 27 comprises an inner ring 28 which has inner teeth 29 and is bounded by a cylindrical outer surface 30 coaxial with the axis 26; and an outer sleeve 31 bonded onto said surface 30.
• the ring 32 is coated with a coating layer 35 which is applied on the surface 34, is arranged in contact with the stator 25 and is made, preferably, but not necessarily, of nickel, namely a material having a relatively high wear resistance.
• the rotor 27 defines an outer gear of the pump 7 which further comprises an annular-shaped inner gear 36 seated inside said rotor 27.
• the two sets of teeth 29, 38 are formed so as to define a plurality of variable-volume chambers 39 which are distributed around the axis 26, are joined together in a fluid-tight manner and are connected hydraulically partly to a fuel inlet 40 of the pump 7 and partly to a fuel outlet 41 of said pump 7.
• the volume of the chambers 39 associated with the inlet 40 increases in a direction 42 of rotation of the rotor 27 about the axis 26 and the gear 36 about the axis 37 and that the volume of the chambers 39 associated with the outlet 41 diminishes in the direction 42 so as to compress the fuel.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rotary Pumps (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=52633425

Family Applications (1)

Country Status (2)

Families Citing this family (3)

Family Cites Families (4)

• 2015
  • 2015-12-18 WO PCT/EP2015/080517 patent/WO2016124295A1/en active Application Filing
  • 2015-12-18 EP EP15823327.0A patent/EP3253968A1/de not_active Withdrawn

Non-Patent Citations (1)

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