Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
  • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
  • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
  • F02M59/102—Mechanical drive, e.g. tappets or cams
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
  • F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers

Definitions

• the present invention relates to a high-pressure fuel supply pump.
• a high-pressure fuel supply pump that has been used conventionally for the purpose of supplying high-pressure fuel to a common rail system, for example, is accommodated in a barrel 10 1 in a reciprocating manner as shown in FIG.
• the plunger 10 0 2 reciprocates in response to the rotation of the camshaft 10 3 and pressurizes the fuel supplied into the barrel 1 0 1 via the inlet / outlet valve 1 0 4, which is obtained High-pressure fuel is sent to the outside by an inlet / outlet ⁇ valve 10 4.
• Japanese Laid-Open Patent Publication No. 8-683370 discloses a configuration of a high pressure fuel supply pump having two return passages, one of which is connected to a fuel tank. Disclosure of the invention
• the leak fuel that is part of the fuel used for fuel lubrication of the barrel 10 1 among the high-pressure fuel pressurized in the barrel 1 0 1 Is supplied to the barrel 1 0 1 through the passage 1 0 5 again, especially in an operating state in which the amount of discharged fuel is reduced, the The temperature of the rel 1 0 1 and the plunger 1 0 2 increased, which was a major factor in reducing the fuel injection efficiency.
• the configuration disclosed in Japanese Patent Laid-Open No. 8-6 8 3 70 in the case of a configuration having a plurality of high-pressure pump units, the configuration of the return passage for the treatment of leaked fuel Has the problem of increasing cost and cost.
• An object of the present invention is to provide a high-pressure fuel supply pump that can solve the above-mentioned problems in the prior art.
• a plurality of high-pressure pump units configured to pressurize fuel sucked into a barrel by a plunger to obtain high-pressure fuel
• fuel lubrication is performed between the plunger and the barrel by at least a part of the high-pressure fuel, and each of the high-pressure pump units is configured to perform the fuel lubrication.
• a leak fuel take-out section for taking out leaked fuel from the inside of the barrel to the outside is provided, and the leak fuel taken out by each leak fuel take-out section goes to the fuel low pressure side through the separate leak passage.
• a high-pressure fuel supply pump is proposed which is characterized by being guided. According to the present invention, leak fuel that is a part of the fuel used for fuel lubrication between the plunger and the barrel is not circulated and supplied to the barrel, and the temperature rise of the plunger is suppressed, and simple With the configuration, the fuel injection efficiency can be improved.
• FIG. 1 is a schematic external view of an embodiment of the present invention.
• FIG. 2 is a cross-sectional view of the first high-pressure pump section of FIG.
• FIG. 3 is a view for explaining a leaked fuel take-out section shown by a cross section along line AA in FIG.
• FIG. 4 is a diagram for explaining a modification of the embodiment of the present invention.
• FIG. 5 is a diagram for explaining a modification of the embodiment of the present invention.
• FIG. 6 is a view for explaining a conventional high-pressure fuel supply pump. BEST MODE FOR CARRYING OUT THE INVENTION
• FIG. 1 is a view schematically showing the appearance of an embodiment of a high-pressure fuel supply pump to which the present invention is applied.
• the high-pressure fuel supply pump 1 is used as a supply pump for a common rail system (not shown) used as a fuel injection device for a diesel engine.
• FIG. 2 is a pump cross-sectional view for explaining the first high-pressure pump unit 1 A.
• the first high pressure pump unit 1A will be described in detail with reference to FIG. 2.
• the configurations of the second high pressure pump unit 1B to the fourth high pressure pump unit 1D are also the configurations of the first high pressure pump unit 1A.
• Reference numeral 3 denotes a pump housing.
• the common base end 3 Y of the pump housing 3 is formed in a substantially cylindrical shape having an axis in a direction perpendicular to the paper surface, and a cam shaft is provided in the common base end 3 Y. 4 are arranged coaxially.
• the first cylindrical portion 3A is formed in a body at the common base end portion 3Y of the pump housing 3, and the main structural portion of the first high-pressure pump portion 1A is in the first cylindrical portion 3A. It has been incorporated.
• the common base end 3 Y includes the second to the second high pressure pump portions 1 B, 1 C, 1 C, and 4 D for the second high pressure pump portion 1 D.
• 1 1 is a barrel arranged coaxially in the first cylindrical part 3 A
• 1 2 is a plunger chamber 1 1
• a plunger chamber 1 1 is a plunger provided in a reciprocating motion along its axis in 1 A Yes
• the plunger 1 2 is guided by the inner wall surface 3 A a of the valenore 1 1 so as to be movable in the axial direction of the first cylindrical portion 3 A.
• the base end portion 1 2 A of the plunger 1 2 is pressed against the movement guide member 13 by the elastic spring 14 through the spring 1 14 a.
• the moving guide member 13 is provided with a rotating roller 13 B that is rotatably fitted by a support bar 13 A.
• the movement guide member 1 3 is elastically urged toward the camshaft 4 by the elastic spring 14 interposed between the barrel 1 1 and the movement guide member 1 3.
• the rotating roller 13 B provided as described above is always in pressure contact with the cam shaft 4.
• the fuel in the external fuel tank (not shown) is moved into the plunger chamber 1 1 through the fuel intake passages 1 7, 15 C and 15 B when the plunger 1 2 moves backward toward the camshaft 4 side. Inhaled in A. This sucked fuel is pressurized when the plunger 12 is lifted, and high-pressure fuel is obtained.
• Reference numeral 15 denotes an inlet ⁇ 'outlet ⁇ valve assembly fixed to the tip of the barrel 11 in order to take out high-pressure fuel from the plunger chamber 11A.
• Inlet 'Outlet ⁇ Valve assembly 1 5 Case 1 5 A has a passage 15 B and a passage 15 C provided in the plunger chamber 1 1 A. The high-pressure fuel obtained by the above is discharged from the valve body 15 D through the passage 15 B to the outside.
• a leak fuel take-out section 16 is provided.
• the leak fuel take-out part 16 is provided with an annular pot for collecting the leak fuel in the barrel provided at the end of the fuel leak hole 16 A and the plunger 1 2 side of the fuel leak hole 16 A. It is composed of 1 6 B and an annular leak separate oil feeding chamber 16 C formed by an annular groove formed in the outer peripheral wall of the barrel 11 1 at the other end of the fuel leak hole 16 A .
• FIG. 3 is a cross-sectional view taken along line AA in FIG.
• the leak fuel extraction sections 2 6, 3 6 similar to the leak fuel extraction section 1 6, respectively. 4 and 6 are provided. That is, the leak fuel takeout part 26 is composed of a fuel leak hole 26 A, an annular port 26 B, and a separate oil feeding chamber 26 C.
• the leak fuel take-out part 36 is composed of a fuel leak hole 36 A, an annular port 36 B, and a separate oil feeding chamber 36 C.
• the leak fuel take-out section 46 is composed of a fuel leak hole 46 A, an annular port 46 B, and an oil supply chamber 46 C for each leak.
• the leak-separated oil supply chambers 16 C, 26 C, 36 C, and 46 C are connected to each other as shown in the figure by a connecting transport path 50.
• the connected transportation path 50 is a separate leakage path for collecting the leaked fuel taken out by the leaked fuel take-out portions 16, 26, 36, and 46 and leading it to the fuel low pressure side. Therefore, the leak fuel extraction part of each high-pressure pump part 1 6, Each leaked fuel taken out by 2, 6, 3 and 4 6 is sent from the corresponding oil supply chambers for leaks 1 6 C, 2 6 C, 3 6 C and 4 6 C to the connected transport route 50, where the fuel pressure is low To the fuel tank, for example.
• the leak fuel generated by the high-pressure fuel for lubrication between the barrel and the plunger is the leak fuel take-out section 1 6 provided in each high-pressure pump section. 2, 3 6, 4 6, and sent to a fuel low pressure section such as a fuel tank.
• a fuel low pressure section such as a fuel tank.
• FIG. 3 the leak fuel from each high-pressure pump section is sent to the fuel tank from the four leak-separated oil supply chambers 16 C, 26 C, 36 C, 46 C through the connected transport path 50. It is shown.
• Figure 4 is a schematic depiction of this. However, how to escape leaked fuel is not limited to this configuration.
• FIG. 5 shows another example of how to escape leaked fuel.
• the leaked fuel is connected to the leak-separated oil supply chambers 16C, 26C, 36C, 46C, and connected to other return passages in the high-pressure pump.
• a dedicated escape passage 70 is provided to allow escape.
• the configuration shown in Fig. 5 provides the advantage of not requiring new piping outside the high-pressure pump.
• the connected transport path 50 passes through the centers of the oil chambers by leak 16C, 26C, 36C and 46C. Is an example and does not necessarily have to pass through the center. Industrial applicability
• the high-pressure fuel supply pump prevents the leaked fuel used for fuel lubrication between the plunger barrels from being circulated and supplied to the nozzle, thereby suppressing the temperature rise of the plunger. As a result, fuel injection efficiency can be improved, which helps improve the high-pressure fuel supply pump.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)
• Details Of Reciprocating Pumps (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39429530

Family Applications (1)

Country Status (4)

Families Citing this family (5)

Citations (4)

Family Cites Families (3)

• 2006
  • 2006-11-24 JP JP2006316693A patent/JP2008128164A/ja active Pending
• 2007
  • 2007-08-14 WO PCT/JP2007/066078 patent/WO2008062589A1/ja active Application Filing
  • 2007-08-14 EP EP07792693A patent/EP2088309A4/de not_active Withdrawn
  • 2007-08-14 CN CNA2007800432037A patent/CN101542107A/zh active Pending

Patent Citations (4)

Non-Patent Citations (1)

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