WO2020100037A1 - Helical fuel conveying element - Google Patents

Helical fuel conveying element Download PDF

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Publication number
WO2020100037A1
WO2020100037A1 PCT/IB2019/059713 IB2019059713W WO2020100037A1 WO 2020100037 A1 WO2020100037 A1 WO 2020100037A1 IB 2019059713 W IB2019059713 W IB 2019059713W WO 2020100037 A1 WO2020100037 A1 WO 2020100037A1
Authority
WO
WIPO (PCT)
Prior art keywords
conveying element
fuel conveying
helical
fuel
pin
Prior art date
Application number
PCT/IB2019/059713
Other languages
French (fr)
Inventor
Albert J. Boecker
Florian Deibel
Original Assignee
Ti Automotive Technology Center 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 Ti Automotive Technology Center Gmbh filed Critical Ti Automotive Technology Center Gmbh
Publication of WO2020100037A1 publication Critical patent/WO2020100037A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2618—Moulds having screw-threaded mould walls
    • B29C45/262—Moulds having screw-threaded mould walls provided with unscrewing drive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2618—Moulds having screw-threaded mould walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2001/00—Articles provided with screw threads
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps

Definitions

  • the disclosure relates to a helical fuel conveying element, as well as to a method for manufacturing the same.
  • the disclosure further relates to a fuel pump hav ing a helical fuel conveying element.
  • the present disclosure provides a helical fuel conveying element that may be made of plastic material and has small manufacturing tolerances. Further, the disclo sure provides a suitable method for manufacturing such a helical fuel conveying ele ment of plastic material. [0005]This is achieved, according to the disclosure, with the features of claims 1 and 10.
  • the fuel conveying element for a fuel pump of the present disclosure comprises a screw driving element accessible from one axial end of the helical fuel conveying element.
  • This screw driving element is an element adapted to be non-rotatably con nected or engaged with a tool, e.g. a screw driver or a wrench, so that turning the tool results in a turning of the helical fuel conveying element around its center axis.
  • a tool e.g. a screw driver or a wrench
  • the helical fuel conveying element has no undercuts in the direction in which it is screwed out, so that it may be screwed out from the injection mold by simple rotation.
  • the screw driving element is formed integrally with the helical fuel conveying element.
  • the fuel conveying element and the screw driving ele ment are formed integrally as an injection molded part.
  • the helical fuel conveying element has an in particular cylindrical recess at an axial end, at the proximal end of which, i.e. at the bottom of which, the screw driving element is arranged.
  • a pin in particular a metal pin, is inserted in the re cess, one axial end of which protrudes beyond the axial end of the helical fuel convey ing element.
  • the metal pin is connected to the helical fuel conveying element by press fitting.
  • the screw driving element is configured as an inner torx or inner hexagon socket.
  • the axial end of the pin directed towards the fuel con veying element is conical in shape. Thereby, an automatic centering of the pin relative to the fuel conveying element may be effected.
  • the disclosure further relates to a fuel pump with a fuel inlet, a fuel outlet and a drive device for driving the helical fuel conveying element.
  • the fuel pump further com prises a helical fuel conveying element as described in the present application.
  • the pin in the recess serves as an axial bearing for the fuel conveying element.
  • the disclosure further refers to a method for manufacturing a helical fuel con veying elemen, in particular an element as described in the present application.
  • the method comprises the following steps:
  • an injection mold with a helical cavity is provided.
  • a thermoplastic material is introduced into this cavity.
  • the cavity is then closed with a cover.
  • the cover is opened.
  • a tool e.g. a screwdriver or a wrench, is connected positively with a screw driving element, e.g. a screw head, which is ac cessible from the axial end of the fuel conveying element, so that the fuel conveying element can be screwed out of the cavity.
  • FIGs 1 a to 1 c show different views of a helical fuel conveying element of the present disclosure.
  • the fuel conveying element 10 is helical in shape.
  • Figure 1 a four thread pitches are illustrated.
  • Figure 1 b shows a sectional view of the fuel conveying element 10 of the present disclosure.
  • a cylindrical recess 14 is provided at its upper end, with the screw driving element 12 being arranged at the recess bottom 14a.
  • the same is configured as an inner torx.
  • the metal pin 16 is mounted in the recess 14 by press fitting, the lower end of the pin being conically shaped, whereby the pin is centered relative to the fuel convey ing element 10. If the fuel conveying element 10 is used in a fuel pump, the metal pin 16 serves as an axial bearing. The rotation provided by a non-illustrated drive device can be transmitted via a form-fitting element at the lower end of the fuel conveying element 10. In Figure 1 c, the same fuel conveying element 10 is illustrated in perspec tive view.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

The invention relates to a helical fuel conveying element (10) for a fuel pump comprising a screw driving element (12) accessible from an axial end of the helical fuel conveying element (10). The invention further relates to a fuel pump having such a helical fuel conveying element.

Description

HELICAL FUEL CONVEYING ELEMENT
RELATED APPLICATIONS
[0001]The present patent document claims the benefit of and priority to European Pa tent Application 18205701 .8, filed November 12, 2018, the entire contents of which are incorporated herein by reference.
FIELD
[0002]The disclosure relates to a helical fuel conveying element, as well as to a method for manufacturing the same. The disclosure further relates to a fuel pump hav ing a helical fuel conveying element.
BACKGROUND
[0003] It is known from prior art to use helical fuel conveying elements of metal that can be produced with small tolerances. The production costs of such elements are high. Observing small tolerances is important for achieving a good output and for con veying at a sufficiently high pressure.
SUMMARY
[0004]The present disclosure provides a helical fuel conveying element that may be made of plastic material and has small manufacturing tolerances. Further, the disclo sure provides a suitable method for manufacturing such a helical fuel conveying ele ment of plastic material. [0005]This is achieved, according to the disclosure, with the features of claims 1 and 10.
[0006]The fuel conveying element for a fuel pump of the present disclosure comprises a screw driving element accessible from one axial end of the helical fuel conveying element. This screw driving element is an element adapted to be non-rotatably con nected or engaged with a tool, e.g. a screw driver or a wrench, so that turning the tool results in a turning of the helical fuel conveying element around its center axis. Thereby, it is possible e.g. to screw the helical fuel conveying element out from an injection mold so that the helical fuel conveying element may be produced using but one injection mold from which it can be screwed after curing.
[0007] For this purpose, it is preferred that the helical fuel conveying element has no undercuts in the direction in which it is screwed out, so that it may be screwed out from the injection mold by simple rotation.
[0008]According to the disclosure it is possible to manufacture the helical fuel convey ing element from plastic material without the same having a burr.
[0009] It is preferred that the screw driving element is formed integrally with the helical fuel conveying element.
[0010] It is further preferred that the fuel conveying element and the screw driving ele ment are formed integrally as an injection molded part.
[0011] It is further preferred that the helical fuel conveying element has an in particular cylindrical recess at an axial end, at the proximal end of which, i.e. at the bottom of which, the screw driving element is arranged.
[0012] Further, it is preferred that a pin, in particular a metal pin, is inserted in the re cess, one axial end of which protrudes beyond the axial end of the helical fuel convey ing element. [0013] It is further preferred that the metal pin is connected to the helical fuel conveying element by press fitting.
[0014] Moreover, it is preferred that the screw driving element is configured as an inner torx or inner hexagon socket.
[0015] It is further preferred that the axial end of the pin directed towards the fuel con veying element is conical in shape. Thereby, an automatic centering of the pin relative to the fuel conveying element may be effected.
[0016]The disclosure further relates to a fuel pump with a fuel inlet, a fuel outlet and a drive device for driving the helical fuel conveying element. The fuel pump further com prises a helical fuel conveying element as described in the present application. Here, the pin in the recess serves as an axial bearing for the fuel conveying element.
[0017]The disclosure further refers to a method for manufacturing a helical fuel con veying elemen, in particular an element as described in the present application. The method comprises the following steps:
[0018] First, an injection mold with a helical cavity is provided. A thermoplastic material is introduced into this cavity. The cavity is then closed with a cover. After the thermo plastic material has cured, the cover is opened. A tool, e.g. a screwdriver or a wrench, is connected positively with a screw driving element, e.g. a screw head, which is ac cessible from the axial end of the fuel conveying element, so that the fuel conveying element can be screwed out of the cavity.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Preferred embodiments of the disclosure will be explained hereunder with ref erence to Figures.
[0020] Figures 1 a to 1 c show different views of a helical fuel conveying element of the present disclosure. [0021] As can be seen in Figure 1 a, the fuel conveying element 10 is helical in shape. In Figure 1 a four thread pitches are illustrated.
DETAILED DESCRIPTION
[0022] Figure 1 b shows a sectional view of the fuel conveying element 10 of the present disclosure. A cylindrical recess 14 is provided at its upper end, with the screw driving element 12 being arranged at the recess bottom 14a. In the embodiment illustrated the same is configured as an inner torx.
[0023]The metal pin 16 is mounted in the recess 14 by press fitting, the lower end of the pin being conically shaped, whereby the pin is centered relative to the fuel convey ing element 10. If the fuel conveying element 10 is used in a fuel pump, the metal pin 16 serves as an axial bearing. The rotation provided by a non-illustrated drive device can be transmitted via a form-fitting element at the lower end of the fuel conveying element 10. In Figure 1 c, the same fuel conveying element 10 is illustrated in perspec tive view.

Claims

Claims
1. Helical fuel conveying element (10) for a fuel pump, comprising a screw driving element (12) accessible from an axial end of the helical fuel conveying element (10).
2. Helical fuel conveying element (10) of claim 1, characterized in that the screw driving element (12) is formed integrally with the helical fuel convey ing element (10).
3. Helical fuel conveying element (10) of claim 1 or 2, characterized in that the fuel conveying element (10) and the screw driving element (12) are formed integrally as an injection molded part.
4. Helical fuel conveying element (10) of claim 1 to 3, characterized in that the fuel conveying element (10) has an in particular cylindrical recess (14) at an axial end thereof, the screw driving element (12) being arranged at the proximal recess end (14a), i.e. at the recess bottom.
5. Helical fuel conveying element (10) of claim 4, characterized in that a pin (16), in particular a metal pin, is inserted in the recess (14), one axial end of the pin extending beyond the axial end of the fuel conveying element (10).
6. Helical fuel conveying element (10) of claim 5, characterized in that the fuel conveying element (10) is connected to the pin (16) by press fitting.
7. Helical fuel conveying element (10) of claims 1 to 6, characterized in that the screw driving element (12) is designed as an inner torx or an inner hexagon socket.
8. Helical fuel conveying element (10) of claims 5 to 7, characterized in that the axial end of the pin (16) directed to the fuel conveying element (10) is conical in shape.
9. Fuel pump, comprising a fuel inlet, a fuel outlet, a driving device, a helical fuel conveying element (10) of one of claims 5 or 6, wherein the pin (16) serves as an axial bearing for the fuel conveying ele ment (10).
10. Method for manufacturing a helical fuel conveying element (10), the method comprising the following steps: providing an injection mold having a helical cavity, introducing a thermoplastic material into the cavity, closing the cavity with a cover, after the curing of the thermoplastic material, opening the cover and screw ing out the fuel conveying element (10) from the cavity by form-fitting en gagement of a tool with a screw driving element (12) accessible from the axial end of the fuel conveying element (10).
PCT/IB2019/059713 2018-11-12 2019-11-12 Helical fuel conveying element WO2020100037A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18205701.8A EP3650192B1 (en) 2018-11-12 2018-11-12 Helical fuel pumping element
EP18205701.8 2018-11-12

Publications (1)

Publication Number Publication Date
WO2020100037A1 true WO2020100037A1 (en) 2020-05-22

Family

ID=64277591

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2019/059713 WO2020100037A1 (en) 2018-11-12 2019-11-12 Helical fuel conveying element

Country Status (2)

Country Link
EP (1) EP3650192B1 (en)
WO (1) WO2020100037A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022127309A1 (en) * 2022-10-18 2024-04-18 Visec (Asia) Technology Pte Ltd. Method and injection mold for producing a rotor unit for an eccentric screw pump as well as a rotor unit, a stator unit and an eccentric screw pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0657640A1 (en) * 1993-12-07 1995-06-14 Ford Motor Company Automotive fuel pump with helical impeller
DE102011010442A1 (en) * 2011-02-04 2012-08-09 Thomas Meister Gewindekernausschraubvorrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0657640A1 (en) * 1993-12-07 1995-06-14 Ford Motor Company Automotive fuel pump with helical impeller
DE102011010442A1 (en) * 2011-02-04 2012-08-09 Thomas Meister Gewindekernausschraubvorrichtung

Also Published As

Publication number Publication date
EP3650192A1 (en) 2020-05-13
EP3650192B1 (en) 2022-09-14

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