WO2018069177A1 - Plunger-type high-pressure pump, and high-pressure assembly and oil inlet valve thereof - Google Patents

Plunger-type high-pressure pump, and high-pressure assembly and oil inlet valve thereof Download PDF

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Publication number
WO2018069177A1
WO2018069177A1 PCT/EP2017/075474 EP2017075474W WO2018069177A1 WO 2018069177 A1 WO2018069177 A1 WO 2018069177A1 EP 2017075474 W EP2017075474 W EP 2017075474W WO 2018069177 A1 WO2018069177 A1 WO 2018069177A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
cavity
blind hole
plunger
pressure
Prior art date
Application number
PCT/EP2017/075474
Other languages
French (fr)
Inventor
Qian MA
Qi Zhou
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to DE112017005208.4T priority Critical patent/DE112017005208T5/en
Publication of WO2018069177A1 publication Critical patent/WO2018069177A1/en

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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
    • F02M59/44—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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • 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
    • 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
    • F02M59/46—Valves
    • 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
    • F02M59/46—Valves
    • F02M59/464—Inlet valves of the check valve type
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • F02M63/0042—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing combined with valve seats of the lift valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0452—Distribution members, e.g. valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • 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

Definitions

  • the present application relates to a plunger-type high-pressure pump, and a high- pressure assembly and inlet valve thereof, in particular to a plunger-type high-pressure pump having a spool, and a high-pressure assembly and oil inlet valve thereof.
  • a plunger-type high-pressure pump is used to pressurize fuel to high pressure, then supply the high-pressure fuel to a downstream apparatus.
  • An existing plunger- type high-pressure pump generally comprises a pump housing, a camshaft disposed in the pump housing, and a high-pressure assembly which is also disposed in the pump housing. The camshaft drives a plunger in the high-pressure assembly directly or via another apparatus, and fuel is pressurized by means of the plunger.
  • the high-pressure assembly 20' comprises a plunger sleeve 21', in which plunger sleeve 21'are provided a plunger cavity 201' and a valve cavity 202' in communication with each other, and an oil passage 203'is in communication with the valve cavity 202'.
  • a plunger 22' is provided in the plunger cavity 201', and can reciprocate in the plunger cavity 201'under the driving action of the camshaft mentioned above.
  • a valve assembly 23' is disposed in the valve cavity 202', and comprises a valve retaining element 232' and an oil inlet valve 231'; the valve retaining element 232' is pressed against the oil inlet valve 231' and fixed to the plunger sleeve 21'.
  • the oil inlet valve 231' comprises a valve body 235' and a spool 237'; the valve body 235' is a cylindrical structure, having a valve top face 2351' and a valve bottom face 2352'; a central blind hole 2356' is provided on the valve top face 2351', wherein the central blind hole 2356 does not run through the valve bottom face 2352'.
  • Two transverse holes 2357' which intersect each other in a cross, run through the valve body 235' and are in communication with the central blind hole 2356'.
  • a high-pressure cavity 2353' is formed between the oil inlet valve 231' and the valve retaining element 232'.
  • the spool 237' is disposed in the central blind hole 2356' and can establish communication between, or isolate from one another, the central blind hole 2356' and the high- pressure cavity 2353'.
  • a pressurization cavity 2354' is formed between the valve bottom face 2352' and the plunger 22', and vertical holes 2358' running through the valve top face 2351' and the valve bottom face 2352' are provided in the valve body 235'; the vertical holes 2358' number 4 in total, are disposed so as to be perpendicular to the valve top face 2351' and the valve bottom face 2352', and establish communication between the pressurization cavity 2354' and the high-pressure cavity 2353'.
  • a seat face 2372' is formed at a top end of the spool 237'; the seat face 2372' forms a sealing face with an inner peripheral face of the central blind hole 2356'.
  • a valve spring 234' is disposed in the high-pressure cavity 2353', and presses the spool 237' against the central blind hole 2356', such that the seat face 2372' isolates the central blind hole 2356' from the high-pressure cavity 2353.
  • the object of the present utility model is a plunger-type high-pressure pump, a high-pressure assembly and an oil inlet valve which balance cavitation at a spool seat face and a valve body central blind hole.
  • the present utility model provides a high-pressure assembly, comprising a plunger sleeve, with a plunger cavity and a valve cavity being provided in the plunger sleeve, the valve cavity being in communication with a top end of the plunger cavity and having a larger diameter than the plunger cavity, and an oil passage being provided in the plunger sleeve, to input fuel into the valve cavity; a plunger, disposed in the plunger cavity, and being driven by a cam driven element to reciprocate in the plunger cavity; a valve assembly, disposed in the valve cavity, and comprising an oil inlet valve and a valve retaining element, the valve retaining element being fixed to the plunger sleeve, the oil inlet valve being fixed in the valve cavity by the valve retaining element, the oil inlet valve comprising a valve body and a spool, the valve body having a valve top face and a valve bottom face, a high-pressure cavity being defined between the valve top face and the valve retaining element, a pressurization cavity being
  • a sealing ring extends downwards from the valve bottom face, the sealing ring abutting a bottom face of the valve cavity, and the pressurization cavity being enclosed by the valve bottom face, a top face of the plunger, and a peripheral face of the plunger cavity.
  • a recessed part is provided on an outer peripheral face of the valve body, the recessed part and an inner peripheral face of the valve cavity forming a recessed cavity, and the transverse holes and the oil passage all being in communication with the recessed cavity.
  • a valve spring is disposed in the high-pressure cavity, the valve spring pressing the spool onto the central blind hole.
  • the spool has a seat part, the seat part having a seat face, the seat face being arranged to enable communication or sealing with the central blind hole in order to connect or close the central blind hole and the high-pressure cavity.
  • multiple rib parts are provided below the seat part of the spool, with inter-rib grooves being formed between the multiple rib parts, the inter-rib grooves being in communication with the transverse holes.
  • the transverse holes are in number, running through the valve body and intersecting at right angles.
  • openings of the vertical holes on the valve top face lie on a circumference concentric with the central blind hole.
  • openings of the vertical holes on the valve bottom face lie on the same circumference, having the same diameter as the circumference on the valve top face.
  • the present utility model also provides a plunger-type high-pressure pump, comprising a housing, with a high-pressure assembly accommodating cavity and a camshaft cavity being provided in the housing, the high-pressure assembly accommodating cavity and the camshaft cavity being in communication with each other; a camshaft, disposed in the camshaft cavity, with at least one cam being provided on the camshaft; a cam driven element, disposed between the high-pressure assembly and the camshaft and driven by the cam; the high-pressure assembly as described above.
  • the present utility model also provides an oil inlet valve, comprising a valve body and a spool, the valve body having a valve top face and a valve bottom face, with a central blind hole which runs in the axial direction of the valve body being provided in the valve body, multiple transverse holes being in communication with the central blind hole, multiple vertical holes being disposed in the valve body, the vertical holes establishing communication between the valve top face and the valve bottom face, the spool being disposed in the central blind hole and being able to connect or close the central blind hole and the high-pressure cavity, and the vertical holes making a certain included angle with the axial direction of the central blind hole.
  • openings of the vertical holes on the valve top face lie on a single circumference.
  • openings of the vertical holes on the valve bottom face lie on the same circumference, having the same diameter as the circumference on the valve top face.
  • Fig. 1A is a sectional view of a high-pressure assembly in the prior art, intended to show the positional relationships among the structures in the high-pressure assembly.
  • Fig. IB is a partial enlarged view of the high-pressure assembly shown in fig. 1A, intended to illustrate the structure of a valve assembly part.
  • Fig. 2 is a perspective view of a valve body in the prior art; the transparent part shown in the figure is merely intended to facilitate explanation, and might be different in an actual product.
  • Fig. 3 is a sectional view of an embodiment of the plunger-type high-pressure pump of the present utility model, intended to show the basic structural composition of the plunger-type high-pressure pump.
  • Fig. 4 is a sectional view of an embodiment of the high-pressure assembly of the present utility model, intended to show the structural relationships among the parts in the high-pressure assembly.
  • Fig. 5 is a perspective view of an embodiment of the valve body of the present utility model, intended to show the valve body; the transparent part in the figure is merely intended to facilitate explanation, and an actual product might be different.
  • Fig. 6 is a perspective view of an embodiment of the spool of the present utility model.
  • a plunger-type high-pressure pump 100 of the present utility model comprises a housing 10, with a camshaft cavity 102 and a high-pressure assembly accommodating cavity 101 being provided in the housing 10, wherein the high-pressure assembly accommodating cavity 101 and the camshaft cavity 102 are in communication with each other.
  • a camshaft 30 is disposed in the camshaft cavity 102, with one or more cams 301 being disposed on the camshaft 30.
  • a high-pressure assembly 20 is disposed in the high-pressure assembly accommodating cavity 101, and a cam driven element 40 is disposed between the high-pressure assembly 20 and the cam 30; the cam driven element 40 is driven by the cam 301, and converts rotational motion of the cam 301 into up/down reciprocating motion.
  • the high-pressure assembly 20 comprises a plunger sleeve 21, with a plunger cavity 201 being provided in the plunger sleeve 21, and a plunger 22 being disposed in the plunger cavity; the plunger 22 reciprocates in the plunger cavity 201 under the action of the cam driven element 40.
  • a valve cavity 202 At a top end of the plunger cavity 201 is provided a valve cavity 202 in communication therewith, and an oil passage 203 is also provided on the plunger sleeve 21, for inputting fuel into the valve cavity 202.
  • the valve cavity 202 and the plunger cavity 201 are coaxial cylindrical cavities, and the diameter of the valve cavity 202 is greater than the diameter of the plunger cavity 201.
  • a valve assembly 23 is disposed in the valve cavity 202, the valve assembly 23 comprising an oil inlet valve 231 and a valve retaining element 232; the valve retaining element 232 is fastened to an upper part of the valve cavity 202 by a screw, and presses the oil inlet valve 231 tightly.
  • a high-pressure cavity 2353 is formed between the valve retaining element 232 and the oil inlet valve 231, and a valve spring 234 is provided in the high-pressure cavity 2353.
  • the oil inlet valve 231 comprises a valve body 235 and a spool 237; an upper section of the valve body 235 has the same diameter as the valve cavity 202, but the valve body is shrunk inwards at a lower section, forming a recessed part, and a recessed cavity 2355 is formed at the recessed part and an inner peripheral face of the valve cavity 202.
  • the valve body 235 has a valve top face 2351 and a valve bottom face 2352; an annular sealing ring 23521 extends downwards from the valve bottom face 2352, the sealing ring 23521 forming a pressurization cavity 2354 with an inner peripheral face of the plunger cavity 201 and the valve cavity 202.
  • a central blind hole 2356 is provided in the valve body 235, running downwards from the valve top face 2351 in the axial direction of the valve body 235; the central blind hole 2356 does not run through the valve bottom face 2352, and two transverse holes 2357, which are arranged to intersect at right angles, are in communication with the central blind hole 2356. Both transverse holes 2357 run through the valve body 235, and are in communication with the recessed cavity 2355.
  • the oil passage 203 is also in communication with the recessed cavity 2355.
  • the spool 237 comprises a seat part 2371, with a compressed valve spring 234 being provided at an upper part of the seat part 2371.
  • a seat face 2372 is formed on the seat part 2371; in this embodiment, the seat face 2372 is an oblique face, and a seal can be formed between the seat face and an inner surface of the central blind hole 2356.
  • Multiple rib parts 2373 are provided below the seat part 2371, with inter-rib grooves 2375 being formed between the multiple rib parts 2373; fuel can flow from the inter-rib grooves 2375.
  • the seat part 2371 of the spool 237 partially projects outside the central blind hole 2356; the rib parts 2373 and inter-rib grooves 2375 are in the central blind hole 2356 when the seat part 2372 is sealed to the central blind hole 2356.
  • multiple vertical holes 2358 are provided between the valve top face 2351 and the valve bottom face 2352; in this embodiment, there are 4 vertical holes.
  • the vertical holes 2358 make a certain included angle with the axial direction of the central blind hole 2356; more preferably, multiple openings of the vertical holes 2358 on the valve top face 2351 lie on a circumference concentric with the central blind hole 2356, while multiple openings of the vertical holes 2358 on the valve bottom face 2352 also lie on a circumference concentric with the central blind hole 2356; most preferably, the two circumferences have the same diameter.
  • the vertical holes 2358 establish communication between the pressurization cavity 2354 and the high-pressure cavity 2353.
  • the pressure in the oil passage 203 is always atmospheric pressure, the pressure in the transverse holes 2357 in communication therewith and in the inter-rib grooves 2375 and the central blind hole 2356 is also close to atmospheric pressure; at this time, the pressure difference between the two ends of the spool 237 will cause contact between the seat face 23 and the central blind hole 2356 to be broken; fuel enters the high-pressure cavity 2353 from the oil passage 203, the transverse holes 2357 and the central blind hole 2356, and enters the pressurization cavity 2354 through the vertical holes 2358; the pressurization cavity 2354 will thus fill with fuel.
  • the plunger 22 moves upwards under the pushing action of the cam driven element 40, at which time the pressure in the pressurization cavity 2354 rapidly increases, and high- pressure fuel enters the high-pressure cavity 2353 through the vertical holes 2358. Since the vertical holes 2358 are arranged to be oblique with respect to the valve top face 2351, high-pressure fuel is also injected into the high-pressure cavity 2353 obliquely; under the action of multiple bursts of liquid oil, the fuel in the high-pressure cavity 2353 will form a rotating vortex.
  • the spool 237 Due to the increase in pressure in the high- pressure cavity 2353, the spool 237 begins to fall under the combined action of the pressure difference and the valve spring 234; before the seat face 2372 forms a seal with the central blind hole 2356, a portion of the high-pressure fuel will leak into the central blind hole 2356 through the gap between the seat face 2372 and the central blind hole 2356, and be discharged through the pathway of the central blind hole 2356, the transverse holes 2357 and the oil passage 203. Due to the vortex of fuel in the high-pressure cavity 2353, bubbles in the fuel are distributed over the circular ring of the surface of contact between the seat face 2372 and the central blind hole 2356 in a more balanced fashion, so non-uniform cavitation regions will not form.

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

Abstract

The present utility model comprises an oil inlet valve (231), characterized by comprising a valve body (235) and a spool (237), the valve body (235) having a valve top face (2351) and a valve bottom face (2352), with a central blind hole (2356) which runs in the axial direction of the valve body (235) being provided in the valve body (235), multiple transverse holes (2357) being in communication with the central blind hole (2356), multiple vertical holes (2358) being disposed in the valve body (235), the vertical holes (2358) being capable of establishing communication between the valve top face (2351) and the valve bottom face (2352), the spool (237) being disposed in the central blind hole (2356) and being able to connect or close the central blind hole (2356) and the high-pressure cavity (2353), and the vertical holes (2358) being arranged to make a certain included angle with the central blind hole. Cavitation is balanced in the oil inlet valve of the present utility model.

Description

Title
Plunger-type high-pressure pump, and high-pressure assembly and oil inlet valve thereof
Technical field
The present application relates to a plunger-type high-pressure pump, and a high- pressure assembly and inlet valve thereof, in particular to a plunger-type high-pressure pump having a spool, and a high-pressure assembly and oil inlet valve thereof.
Background art
A plunger-type high-pressure pump is used to pressurize fuel to high pressure, then supply the high-pressure fuel to a downstream apparatus. An existing plunger- type high-pressure pump generally comprises a pump housing, a camshaft disposed in the pump housing, and a high-pressure assembly which is also disposed in the pump housing. The camshaft drives a plunger in the high-pressure assembly directly or via another apparatus, and fuel is pressurized by means of the plunger.
Reference is made to figs. 1A and IB, which are sectional drawings of an existing high-pressure assembly 20', and are intended to show the structural relationships of the components in the high-pressure assembly. The high-pressure assembly 20' comprises a plunger sleeve 21', in which plunger sleeve 21'are provided a plunger cavity 201' and a valve cavity 202' in communication with each other, and an oil passage 203'is in communication with the valve cavity 202'. A plunger 22' is provided in the plunger cavity 201', and can reciprocate in the plunger cavity 201'under the driving action of the camshaft mentioned above. A valve assembly 23' is disposed in the valve cavity 202', and comprises a valve retaining element 232' and an oil inlet valve 231'; the valve retaining element 232' is pressed against the oil inlet valve 231' and fixed to the plunger sleeve 21'.
Reference is made to the schematic structural diagram of an existing oil inlet valve 231' shown in fig. IB; in the figure, some of the structure is merely schematic to facilitate explanation, and may be slightly different from an actual product. The oil inlet valve 231' comprises a valve body 235' and a spool 237'; the valve body 235' is a cylindrical structure, having a valve top face 2351' and a valve bottom face 2352'; a central blind hole 2356' is provided on the valve top face 2351', wherein the central blind hole 2356 does not run through the valve bottom face 2352'. Two transverse holes 2357', which intersect each other in a cross, run through the valve body 235' and are in communication with the central blind hole 2356'. A high-pressure cavity 2353' is formed between the oil inlet valve 231' and the valve retaining element 232'. The spool 237' is disposed in the central blind hole 2356' and can establish communication between, or isolate from one another, the central blind hole 2356' and the high- pressure cavity 2353'. A pressurization cavity 2354'is formed between the valve bottom face 2352' and the plunger 22', and vertical holes 2358' running through the valve top face 2351' and the valve bottom face 2352' are provided in the valve body 235'; the vertical holes 2358' number 4 in total, are disposed so as to be perpendicular to the valve top face 2351' and the valve bottom face 2352', and establish communication between the pressurization cavity 2354' and the high-pressure cavity 2353'.
A seat face 2372' is formed at a top end of the spool 237'; the seat face 2372' forms a sealing face with an inner peripheral face of the central blind hole 2356'. A valve spring 234' is disposed in the high-pressure cavity 2353', and presses the spool 237' against the central blind hole 2356', such that the seat face 2372' isolates the central blind hole 2356' from the high-pressure cavity 2353.
During operation, when the plunger 22' moves downward, negative pressure forms in the pressurization cavity 2354' and the high-pressure cavity 2358'. At this time, fuel in the oil passage 203' will enter the central blind hole 2356' through the transverse holes 2357', and a pressure difference between two sides of the spool 237' will impel the spool 237' to move upwards, such that contact between the seat face 2372' and the central blind hole 2356' is broken; fuel enters the high-pressure cavity 2353' through the central blind hole 2356', and is finally injected into the pressurization cavity 2354' through the vertical holes 2358'. When the fuel suction process ends, the plunger 22' moves upwards, pressure in the pressurization cavity 2354' rapidly increases, and pressurized fuel enters the high-pressure cavity 2353' through the vertical holes 2358'. High pressure in the high-pressure cavity 2353 will impel fuel to flow back into the central blind hole 2356'. Since there are 4 openings in communication with the transverse holes 2357', whereas the oil passage 203' has just one, the flow rate will be greatest at the transverse hole 2357' close to the oil passage 203' side. In other words, the flow rate from parts of the seat face 2372' and the central blind hole 2356' close to the oil passage 203' side will be greater than from other parts, with the result that cavitation at parts of the seat face 2372' and the central central blind hole 2356' close to the oil passage 203' side will be far more severe that at other parts.
Thus, there is a need for a plunger-type high-pressure pump, a high-pressure assembly and an oil inlet valve which are capable of balancing cavitation at a spool seat face and a valve body central blind hole.
Content of the utility model
The object of the present utility model is a plunger-type high-pressure pump, a high-pressure assembly and an oil inlet valve which balance cavitation at a spool seat face and a valve body central blind hole.
The present utility model provides a high-pressure assembly, comprising a plunger sleeve, with a plunger cavity and a valve cavity being provided in the plunger sleeve, the valve cavity being in communication with a top end of the plunger cavity and having a larger diameter than the plunger cavity, and an oil passage being provided in the plunger sleeve, to input fuel into the valve cavity; a plunger, disposed in the plunger cavity, and being driven by a cam driven element to reciprocate in the plunger cavity; a valve assembly, disposed in the valve cavity, and comprising an oil inlet valve and a valve retaining element, the valve retaining element being fixed to the plunger sleeve, the oil inlet valve being fixed in the valve cavity by the valve retaining element, the oil inlet valve comprising a valve body and a spool, the valve body having a valve top face and a valve bottom face, a high-pressure cavity being defined between the valve top face and the valve retaining element, a pressurization cavity being defined between the valve bottom face and the plunger, a central blind hole being provided in the valve body, running downwards from the valve top face in the axial direction of the valve body, multiple transverse holes establishing communication between the oil passage and the central blind hole, multiple vertical holes being disposed in the valve body, the vertical holes establishing communication between the pressurization cavity and the high-pressure cavity, the spool being disposed in the central blind hole and being able to connect or close the central blind hole and the high-pressure cavity, and the vertical holes making a certain included angle with the axial direction of the central blind hole.
Preferably, a sealing ring extends downwards from the valve bottom face, the sealing ring abutting a bottom face of the valve cavity, and the pressurization cavity being enclosed by the valve bottom face, a top face of the plunger, and a peripheral face of the plunger cavity.
Preferably, a recessed part is provided on an outer peripheral face of the valve body, the recessed part and an inner peripheral face of the valve cavity forming a recessed cavity, and the transverse holes and the oil passage all being in communication with the recessed cavity.
Preferably, a valve spring is disposed in the high-pressure cavity, the valve spring pressing the spool onto the central blind hole.
Preferably, the spool has a seat part, the seat part having a seat face, the seat face being arranged to enable communication or sealing with the central blind hole in order to connect or close the central blind hole and the high-pressure cavity. Preferably, multiple rib parts are provided below the seat part of the spool, with inter-rib grooves being formed between the multiple rib parts, the inter-rib grooves being in communication with the transverse holes.
Preferably, the transverse holes are in number, running through the valve body and intersecting at right angles.
Preferably, openings of the vertical holes on the valve top face lie on a circumference concentric with the central blind hole.
Preferably, openings of the vertical holes on the valve bottom face lie on the same circumference, having the same diameter as the circumference on the valve top face.
The present utility model also provides a plunger-type high-pressure pump, comprising a housing, with a high-pressure assembly accommodating cavity and a camshaft cavity being provided in the housing, the high-pressure assembly accommodating cavity and the camshaft cavity being in communication with each other; a camshaft, disposed in the camshaft cavity, with at least one cam being provided on the camshaft; a cam driven element, disposed between the high-pressure assembly and the camshaft and driven by the cam; the high-pressure assembly as described above.
The present utility model also provides an oil inlet valve, comprising a valve body and a spool, the valve body having a valve top face and a valve bottom face, with a central blind hole which runs in the axial direction of the valve body being provided in the valve body, multiple transverse holes being in communication with the central blind hole, multiple vertical holes being disposed in the valve body, the vertical holes establishing communication between the valve top face and the valve bottom face, the spool being disposed in the central blind hole and being able to connect or close the central blind hole and the high-pressure cavity, and the vertical holes making a certain included angle with the axial direction of the central blind hole.
Preferably, openings of the vertical holes on the valve top face lie on a single circumference. Preferably, openings of the vertical holes on the valve bottom face lie on the same circumference, having the same diameter as the circumference on the valve top face.
In the plunger-type high-pressure pump, high-pressure assembly and oil inlet valve of the present utility model, since the vertical holes are arranged to make an included angle with the central blind hole, a vortex is created when fuel flows through the spool seat face and the central blind hole of the valve body, so cavitation at the spool seat face and the central blind hole of the valve body can be balanced.
Description of the accompanying drawings
Demonstrative embodiments of the present utility model will be explained in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are merely intended to explain the present utility model, without limiting the scope thereof. In the accompanying drawings:
Fig. 1A is a sectional view of a high-pressure assembly in the prior art, intended to show the positional relationships among the structures in the high-pressure assembly.
Fig. IB is a partial enlarged view of the high-pressure assembly shown in fig. 1A, intended to illustrate the structure of a valve assembly part.
Fig. 2 is a perspective view of a valve body in the prior art; the transparent part shown in the figure is merely intended to facilitate explanation, and might be different in an actual product.
Fig. 3 is a sectional view of an embodiment of the plunger-type high-pressure pump of the present utility model, intended to show the basic structural composition of the plunger-type high-pressure pump.
Fig. 4 is a sectional view of an embodiment of the high-pressure assembly of the present utility model, intended to show the structural relationships among the parts in the high-pressure assembly. Fig. 5 is a perspective view of an embodiment of the valve body of the present utility model, intended to show the valve body; the transparent part in the figure is merely intended to facilitate explanation, and an actual product might be different.
Fig. 6 is a perspective view of an embodiment of the spool of the present utility model.
Particular embodiments
Identical or similar components in different accompanying drawings are indicated by identical reference labels.
It should be understood that the accompanying drawings are merely intended to explain the present utility model, wherein component sizes, proportional relations and component quantities are not restrictions on the present utility model.
Referring to fig. 3, a plunger-type high-pressure pump 100 of the present utility model comprises a housing 10, with a camshaft cavity 102 and a high-pressure assembly accommodating cavity 101 being provided in the housing 10, wherein the high-pressure assembly accommodating cavity 101 and the camshaft cavity 102 are in communication with each other. A camshaft 30 is disposed in the camshaft cavity 102, with one or more cams 301 being disposed on the camshaft 30. A high-pressure assembly 20 is disposed in the high-pressure assembly accommodating cavity 101, and a cam driven element 40 is disposed between the high-pressure assembly 20 and the cam 30; the cam driven element 40 is driven by the cam 301, and converts rotational motion of the cam 301 into up/down reciprocating motion.
Referring to fig. 4 in a coordinated fashion, the high-pressure assembly 20 comprises a plunger sleeve 21, with a plunger cavity 201 being provided in the plunger sleeve 21, and a plunger 22 being disposed in the plunger cavity; the plunger 22 reciprocates in the plunger cavity 201 under the action of the cam driven element 40. At a top end of the plunger cavity 201 is provided a valve cavity 202 in communication therewith, and an oil passage 203 is also provided on the plunger sleeve 21, for inputting fuel into the valve cavity 202. In this embodiment, the valve cavity 202 and the plunger cavity 201 are coaxial cylindrical cavities, and the diameter of the valve cavity 202 is greater than the diameter of the plunger cavity 201.
A valve assembly 23 is disposed in the valve cavity 202, the valve assembly 23 comprising an oil inlet valve 231 and a valve retaining element 232; the valve retaining element 232 is fastened to an upper part of the valve cavity 202 by a screw, and presses the oil inlet valve 231 tightly. A high-pressure cavity 2353 is formed between the valve retaining element 232 and the oil inlet valve 231, and a valve spring 234 is provided in the high-pressure cavity 2353. The oil inlet valve 231 comprises a valve body 235 and a spool 237; an upper section of the valve body 235 has the same diameter as the valve cavity 202, but the valve body is shrunk inwards at a lower section, forming a recessed part, and a recessed cavity 2355 is formed at the recessed part and an inner peripheral face of the valve cavity 202.
Referring to fig. 5 in a coordinated manner, the valve body 235 has a valve top face 2351 and a valve bottom face 2352; an annular sealing ring 23521 extends downwards from the valve bottom face 2352, the sealing ring 23521 forming a pressurization cavity 2354 with an inner peripheral face of the plunger cavity 201 and the valve cavity 202. A central blind hole 2356 is provided in the valve body 235, running downwards from the valve top face 2351 in the axial direction of the valve body 235; the central blind hole 2356 does not run through the valve bottom face 2352, and two transverse holes 2357, which are arranged to intersect at right angles, are in communication with the central blind hole 2356. Both transverse holes 2357 run through the valve body 235, and are in communication with the recessed cavity 2355. Moreover, the oil passage 203 is also in communication with the recessed cavity 2355.
Referring to fig. 6, the spool 237 comprises a seat part 2371, with a compressed valve spring 234 being provided at an upper part of the seat part 2371. A seat face 2372 is formed on the seat part 2371; in this embodiment, the seat face 2372 is an oblique face, and a seal can be formed between the seat face and an inner surface of the central blind hole 2356. Multiple rib parts 2373 are provided below the seat part 2371, with inter-rib grooves 2375 being formed between the multiple rib parts 2373; fuel can flow from the inter-rib grooves 2375. The seat part 2371 of the spool 237 partially projects outside the central blind hole 2356; the rib parts 2373 and inter-rib grooves 2375 are in the central blind hole 2356 when the seat part 2372 is sealed to the central blind hole 2356. Inside the valve body 235, multiple vertical holes 2358 are provided between the valve top face 2351 and the valve bottom face 2352; in this embodiment, there are 4 vertical holes. The vertical holes 2358 make a certain included angle with the axial direction of the central blind hole 2356; more preferably, multiple openings of the vertical holes 2358 on the valve top face 2351 lie on a circumference concentric with the central blind hole 2356, while multiple openings of the vertical holes 2358 on the valve bottom face 2352 also lie on a circumference concentric with the central blind hole 2356; most preferably, the two circumferences have the same diameter. The vertical holes 2358 establish communication between the pressurization cavity 2354 and the high-pressure cavity 2353.
During operation, when the plunger 22 moves downwards, the volume of the pressurization cavity 2354 increases, and negative pressure forms at the pressurization cavity 2354, therefore negative pressure also forms in the high-pressure cavity 2353 and the vertical holes 2358 in communication with the pressurization cavity 2354. At this time, since the pressure in the oil passage 203 is always atmospheric pressure, the pressure in the transverse holes 2357 in communication therewith and in the inter-rib grooves 2375 and the central blind hole 2356 is also close to atmospheric pressure; at this time, the pressure difference between the two ends of the spool 237 will cause contact between the seat face 23 and the central blind hole 2356 to be broken; fuel enters the high-pressure cavity 2353 from the oil passage 203, the transverse holes 2357 and the central blind hole 2356, and enters the pressurization cavity 2354 through the vertical holes 2358; the pressurization cavity 2354 will thus fill with fuel. The plunger 22 moves upwards under the pushing action of the cam driven element 40, at which time the pressure in the pressurization cavity 2354 rapidly increases, and high- pressure fuel enters the high-pressure cavity 2353 through the vertical holes 2358. Since the vertical holes 2358 are arranged to be oblique with respect to the valve top face 2351, high-pressure fuel is also injected into the high-pressure cavity 2353 obliquely; under the action of multiple bursts of liquid oil, the fuel in the high-pressure cavity 2353 will form a rotating vortex. Due to the increase in pressure in the high- pressure cavity 2353, the spool 237 begins to fall under the combined action of the pressure difference and the valve spring 234; before the seat face 2372 forms a seal with the central blind hole 2356, a portion of the high-pressure fuel will leak into the central blind hole 2356 through the gap between the seat face 2372 and the central blind hole 2356, and be discharged through the pathway of the central blind hole 2356, the transverse holes 2357 and the oil passage 203. Due to the vortex of fuel in the high-pressure cavity 2353, bubbles in the fuel are distributed over the circular ring of the surface of contact between the seat face 2372 and the central blind hole 2356 in a more balanced fashion, so non-uniform cavitation regions will not form.
The present utility model is described above merely with reference to the most practical preferred embodiments considered at the present time. It must be understood that the explanation above is not a limitation of the present utility model, and the present utility model is not limited to the examples given above.
Changes, alterations in form, additions or substitutions made by those skilled in the art within the substantive scope of the present utility model should also be included in the scope of protection of the present utility model.

Claims

Claims
1. A high-pressure assembly (20), comprising
a plunger sleeve (21), with a plunger cavity (201) and a valve cavity (202) being provided in the plunger sleeve (21), the valve cavity (202) being in communication with a top end of the plunger cavity (201) and having a larger diameter than the plunger cavity (201), and an oil passage (203) being provided in the plunger sleeve (21), to input fuel into the valve cavity (202);
a plunger (22), disposed in the plunger cavity (201), and being driven by a cam driven element (40) to reciprocate in the plunger cavity (201);
a valve assembly (23), disposed in the valve cavity (202), and comprising an oil inlet valve (231) and a valve retaining element (232), the valve retaining element (232) being fixed to the plunger sleeve (21), the oil inlet valve (231) being fixed in the valve cavity (202) by the valve retaining element (232), the oil inlet valve (231) comprising a valve body (235) and a spool (237), the valve body (235) having a valve top face (2351) and a valve bottom face (2352), a high-pressure cavity (2353) being defined between the valve top face (2351) and the valve retaining element (232), a pressurization cavity (2354) being defined between the valve bottom face (2352) and the plunger (22), a central blind hole (2356) being provided in the valve body (235), running downwards from the valve top face (2351) in the axial direction of the valve body (235), multiple transverse holes (2357) establishing communication between the oil passage (203) and the central blind hole (2356), multiple vertical holes (2358) being disposed in the valve body (235), the vertical holes (2358) establishing communication between the pressurization cavity (2354) and the high-pressure cavity (2353), the spool (237) being disposed in the central blind hole (2356) and being able to connect or close the central blind hole (2356) and the high-pressure cavity (2353), and the vertical holes (2358) making a certain included angle with the axial direction of the central blind hole (2356).
2. The high-pressure assembly (20) as claimed in claim 1, characterized in that a sealing ring (23521) extends downwards from the valve bottom face (2352), the sealing ring (23521) abutting a bottom face (2021) of the valve cavity, and the pressurization cavity (2354) being enclosed by the valve bottom face (2352), a top face of the plunger (22), and a peripheral face of the plunger cavity (201).
3. The high-pressure assembly (20) as claimed in claim 1, characterized in that a recessed part is provided on an outer peripheral face of the valve body (235), the recessed part and an inner peripheral face of the valve cavity (202) forming a recessed cavity (2355), and the transverse holes (2357) and the oil passage (203) all being in communication with the recessed cavity (2355).
4. The high-pressure assembly (20) as claimed in claim 1, characterized in that a valve spring (234) is disposed in the high-pressure cavity (2353), the valve spring (234) pressing the spool onto the central blind hole (2356).
5. The high-pressure assembly (20) as claimed in claim 1, characterized in that the spool (237) has a seat part (2371), the seat part (2371) having a seat face (2372), the seat face (2372) being arranged to enable communication or sealing with the central blind hole (2356) in order to connect or close the central blind hole (2356) and the high- pressure cavity (2353).
6. The high-pressure assembly (20) as claimed in claim 1, characterized in that multiple rib parts (2373) are provided below the seat part (2371) of the spool (237), with inter-rib grooves (2375) being formed between the multiple rib parts (2373), the inter-rib grooves (2375) being in communication with the transverse holes (2357).
7. The high-pressure assembly (20) as claimed in claim 1, characterized in that the transverse holes (2357) are two in number, running through the valve body (235) and intersecting at right angles.
8. The high-pressure assembly (20) as claimed in any one of claims 1 to 7, characterized in that openings of the vertical holes (2358) on the valve top face (2351) lie on a circumference concentric with the central blind hole (2356).
9. The high-pressure assembly (20) as claimed in claim 8, characterized in that openings of the vertical holes (2358) on the valve bottom face (2352) lie on the same circumference, having the same diameter as the circumference on the valve top face
(2351) .
10. A plunger-type high-pressure pump (100), characterized by comprising:
a housing (10), with a high-pressure assembly accommodating cavity (101) and a camshaft cavity (102) being provided in the housing (10), the high-pressure assembly accommodating cavity (101) and the camshaft cavity (102) being in communication with each other;
a camshaft (30), disposed in the camshaft cavity (102), with at least one cam (301) being provided on the camshaft (30);
a cam driven element (40), disposed between the high-pressure assembly (20) and the camshaft (30) and driven by the cam (301);
a high-pressure assembly (20), comprising the features of one of claims 1 to 9.
11. An oil inlet valve (231), characterized by comprising a valve body (235) and a spool (237), the valve body (235) having a valve top face (2351) and a valve bottom face
(2352) , with a central blind hole (2356) which runs in the axial direction of the valve body (235) being provided in the valve body (235), multiple transverse holes (2357) being in communication with the central blind hole (2356), multiple vertical holes (2358) being disposed in the valve body (235), the vertical holes (2358) establishing communication between the valve top face (2351) and the valve bottom face (2352), the spool (237) being disposed in the central blind hole (2356) and being able to connect or close the central blind hole (2356) and the high-pressure cavity (2353), and the vertical holes (2358) making a certain included angle with the axial direction of the central blind hole (2356).
12. The oil inlet valve (231) as claimed in claim 11, characterized in that openings of the vertical holes (2358) on the valve top face (2351) lie on a single circumference.
13. The oil inlet valve (231) as claimed in claim 12, characterized in that openings of the vertical holes (2358) on the valve bottom face (2352) lie on the same circumference, which has the same diameter as the circumference on the valve top face (2351).
PCT/EP2017/075474 2016-10-14 2017-10-06 Plunger-type high-pressure pump, and high-pressure assembly and oil inlet valve thereof WO2018069177A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112017005208.4T DE112017005208T5 (en) 2016-10-14 2017-10-06 Plunger piston high pressure pump and high pressure assembly and oil inlet valve of the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201621126001.1U CN206320002U (en) 2016-10-14 2016-10-14 High-pressure plunger pump and its high potential assembly, inlet valve
CN201621126001.1 2016-10-14

Publications (1)

Publication Number Publication Date
WO2018069177A1 true WO2018069177A1 (en) 2018-04-19

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ID=59262895

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Application Number Title Priority Date Filing Date
PCT/EP2017/075474 WO2018069177A1 (en) 2016-10-14 2017-10-06 Plunger-type high-pressure pump, and high-pressure assembly and oil inlet valve thereof

Country Status (3)

Country Link
CN (1) CN206320002U (en)
DE (1) DE112017005208T5 (en)
WO (1) WO2018069177A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU209205U1 (en) * 2021-12-07 2022-02-07 ООО "Нефтемаш-Сервис" VALVE-SEAT PLUG PUMP

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR962293A (en) * 1950-06-07
DE19541507A1 (en) * 1995-11-08 1997-05-15 Bosch Gmbh Robert Fuel injection device for internal combustion engines
WO2006070719A1 (en) * 2004-12-28 2006-07-06 Bosch Corporation Fuel supply pump
CN202946284U (en) * 2012-11-26 2013-05-22 重庆红江机械有限责任公司 Electronic unit pump used for diesel engine
EP2789843A1 (en) * 2013-03-01 2014-10-15 Robert Bosch Gmbh High-pressure fuel supplying pump and diesel engine having the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR962293A (en) * 1950-06-07
DE19541507A1 (en) * 1995-11-08 1997-05-15 Bosch Gmbh Robert Fuel injection device for internal combustion engines
WO2006070719A1 (en) * 2004-12-28 2006-07-06 Bosch Corporation Fuel supply pump
CN202946284U (en) * 2012-11-26 2013-05-22 重庆红江机械有限责任公司 Electronic unit pump used for diesel engine
EP2789843A1 (en) * 2013-03-01 2014-10-15 Robert Bosch Gmbh High-pressure fuel supplying pump and diesel engine having the same

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DE112017005208T5 (en) 2019-07-04

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