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US2948159A - Injection pump for internal combustion engine - Google Patents

Injection pump for internal combustion engine Download PDF

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Publication number
US2948159A
US2948159A US648008A US64800857A US2948159A US 2948159 A US2948159 A US 2948159A US 648008 A US648008 A US 648008A US 64800857 A US64800857 A US 64800857A US 2948159 A US2948159 A US 2948159A
Authority
US
United States
Prior art keywords
tappet
pump
cam shaft
spring
cam
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US648008A
Other languages
English (en)
Inventor
Robert J Wirsching
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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 Daimler Benz AG filed Critical Daimler Benz AG
Application granted granted Critical
Publication of US2948159A publication Critical patent/US2948159A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • 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
    • 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
    • F04B1/0408—Pistons
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18296—Cam and slide

Definitions

  • the present invention relates to a fuel injection pump for internal combustion engine, and more particularly to a connection between the cam shaft and pump piston which is established by a tappet constructed as a sliding member providing for the transmission of forces from the cam shaft to the pump piston.
  • the present invention aims at obviating this disadvantage'and consists essentially in that the tappet is provided witha rubber spring which is preferably cylindrical and surrounds the lower end of the pump piston and which produces a complete sealing of the pump side with respect to the 'cam shaft space.
  • the tappet according to a further feature of the'present invention may be provided with a cylindrical wall and a bottom closing the'inner space of thetappet toward the cam shaft;
  • a spring is thereby arranged in the interior of the tappet which spring is formed as' a nection with the accompanying drawing, which shows, for purposes of illustration only, two embodiments in accordance with the present invention and wherein:
  • Figure 1 is a longitudinal cross-sectional view through the pump plunger or tappet of a fuel injection pump provided with a rubber spring
  • Figure 2 is a longitudinal cross-sectional view through a modified embodiment similar to that of Figure 1 and provided with a plunger in which a' coil spring is vulcanized into, the inside of the rubber spring.
  • reference numeral 1 designates the separating wall which separates the pump space 2 from the cam shaft space 3 disposed therebelow. Only a portion of the cam shaft is shown which may be of suitable construction and is designated by reference numeral 4.
  • the roller 6 abuts or follows the contour of the cam 4, the roller 6 being rotatably journalled in any suitable manner at the lower part of the tappet 5.
  • the tappet 5 establishes the connection transmitting the forces between the cam 4 and the pump piston 7.
  • the longitudinal cross section through the tappet 5 of Figure 1 shows that the walls 8 thereof are formed cylindrically.
  • the outer surface of the lateral limiting walls 8 thereby serves for the guidance of the tappet 5 in the separating wall 1 during the upward and downward movements of the tappet 5.
  • the aperture 9 of the separating wall in which the tappet 5 slides is covered by a plate 10. Only a smaller i aperture 11 is provided in this plate 10 which has a diameter slightly larger than the diameter of the pump piston 7.
  • the rubber spring 12 in accordance with the present invention abuts or supports itself, on the one hand, against the bottom on the inside of tappet 5 and, on the other,
  • the rubber spring 12 is simultaneously capable of cylindrical ring and which consists of elastic material.
  • This spring abuts, on the one hand, against the bottom of the tappet, and, on the other, against a plate by means of which the aperture in the separating wall in which the tappet slides is covered.
  • cylindrical rubber spring be provided in the inside thereof with a helical or coil spring which may be vulcanized into the rubber spring.
  • a still further object of the present invention is to provide a simple construction which may be readily assembled and which is relatively inexpensive and yet provides a complete adequate seal between the fuel injection pump and the space in which the cam shaft actuating the injection pump is disposed.
  • a plate 13 may be provided with rests against the bottom of the tappet 5 and a plate 14 may be provided below the cover plate 10. Appropriately, these plates 13 and 14 are vulcanized to the rubber spring 12.
  • the plate 14 is futher sealed on the outside thereof by means ofan annular sealing ring 16 which is fitted into groove 15.
  • the upper edge 17 of the tappet 5 terminates at such a distance from the lower side of the plate 14 that suflicient space remains for the tappet 5 in the upward movement thereof.
  • the pump piston 7 may be surrounded at the place 11 of its passage through the plate 10 with a gland or the like of suitable construction.
  • Figure 2 shows an arrangement essentially similar to Figure 1 in which the various parts are also shown in longitudinal cross section.
  • the pump tappet 5 is also springingly and sealingly supported.
  • This embodiment differs from that of Figure 1 only in that the rubber spring 18 thereof according to the present invention is modified. More particularly, for purposes of increasing the rigidity and the pressure effect, a coil spring "19 is vulcanized into the rubber spring 18. Otherwise,
  • cylindrical spring 12 or 18 may also be made of any suitable elastic material other than rubber.
  • a force-transmitting connection between a fuel injection pump for an internal combustion engine provided with a piston and a pump-actuating cam driven by a cam shaft comprising means between said cam shaft and pump piston including a tappet for transmitting the forces from said cam to said pump piston, and a cylindrical rubber spring within said tappet surrounding the lower end of said pump piston to thereby provide a complete sealing of the pump side from the cam shaft space.
  • a force-transmitting connection between a fuel-injection pump for an internal combustion engine provided with a piston and a pump-actuating cam driven by a cam shaft comprising a separating wall between the cam shaft space and the pump side, a tappet transmitting the forces from said cam to said pump piston, said separating wall being provided with an aperture for slidingly receiving therein said tappet, and a cylindrical spring made of elastic material and surrounding the lower end of said pump piston to thereby provide a complete sealing of said pump side from said cam shaft space while simultaneously urging said tappet into engagement with said cam.
  • a force-transmitting connection between a fuel-injection pump for an internal combustion engine provided with a pump piston and a pump-actuating cam driven by a cam shaft comprising a separating Wall provided with an aperture between the cam shaft space and the pump side, a tappet formed as sliding member and transmitting the forces from said cam to said pump piston, said tappet being formed by cylindrical walls and a bottom closing said cylindrical walls in the direction of said cam, a cover plate to cover said aperture, and a cylindrical rubber spring surrounding the lower end of said pump piston to thereby provide a complete sealing of the pump side from the cam shaft space, said cylindrical rubber spring abutting against the undersurface of said cover plate and the upper side of said tappet bottom.
  • a fuel-injection pump for an internal combustion engine provided with a cam driven by a cam shaft and pump piston comprising a connection between said cam and said pump piston including a tappet formed as sliding member and transmitting the forces from said cam to said pump piston, said tappet being provided with a cylindrical rubber spring surrounding the lower end of said pump piston to thereby provide a complete sealing of the pump side from the cam shaft space while simultaneously urging said tappet into engagement with said cam.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
US648008A 1956-04-04 1957-03-25 Injection pump for internal combustion engine Expired - Lifetime US2948159A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED22685A DE1096114B (de) 1956-04-04 1956-04-04 Einspritzpumpe fuer Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US2948159A true US2948159A (en) 1960-08-09

Family

ID=7037539

Family Applications (1)

Application Number Title Priority Date Filing Date
US648008A Expired - Lifetime US2948159A (en) 1956-04-04 1957-03-25 Injection pump for internal combustion engine

Country Status (3)

Country Link
US (1) US2948159A (de)
DE (1) DE1096114B (de)
FR (1) FR1166197A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523459A (en) * 1967-09-25 1970-08-11 Cav Ltd Reciprocating mechanisms
US20170211534A1 (en) * 2014-10-15 2017-07-27 Continental Automotive Gmbh High Pressure Pump For A Fuel Injection System Of An Internal Combustion Engine
US10208725B2 (en) 2014-10-15 2019-02-19 Continental Automotive Gmbh High pressure fuel pump and associated drive device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1695848A (en) * 1924-11-01 1928-12-18 Westinghouse Lamp Co Gas economizer
US2038968A (en) * 1933-12-18 1936-04-28 Gen Motors Corp Engine mounting
US2398798A (en) * 1944-05-22 1946-04-23 Willis G Meyers Fuel injection pump
US2532000A (en) * 1950-11-28 Cam operated switch contact
US2605099A (en) * 1949-01-07 1952-07-29 Firestone Tire & Rubber Co Rubber-metal spring
US2755671A (en) * 1951-09-20 1956-07-24 Delany Realty Corp Resilient sealing units for flush valve actuators

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1818797A (en) * 1927-06-03 1931-08-11 Ind General Res Corp Sa Soc Ge Hermetic closure for joints such as those between pump bodies and their plungers
US2038089A (en) * 1932-03-14 1936-04-21 John W Smith Diaphragm pump
DE616971C (de) * 1938-08-07
DE956560C (de) * 1951-02-05 1957-01-17 Bruno Tavola Kraftstoffeinspritzpumpe fuer Brennkraftmaschinen oder unter aehnlichen Bedingungen arbeitende Fluessigkeitspumpe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532000A (en) * 1950-11-28 Cam operated switch contact
US1695848A (en) * 1924-11-01 1928-12-18 Westinghouse Lamp Co Gas economizer
US2038968A (en) * 1933-12-18 1936-04-28 Gen Motors Corp Engine mounting
US2398798A (en) * 1944-05-22 1946-04-23 Willis G Meyers Fuel injection pump
US2605099A (en) * 1949-01-07 1952-07-29 Firestone Tire & Rubber Co Rubber-metal spring
US2755671A (en) * 1951-09-20 1956-07-24 Delany Realty Corp Resilient sealing units for flush valve actuators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3523459A (en) * 1967-09-25 1970-08-11 Cav Ltd Reciprocating mechanisms
US20170211534A1 (en) * 2014-10-15 2017-07-27 Continental Automotive Gmbh High Pressure Pump For A Fuel Injection System Of An Internal Combustion Engine
US10174731B2 (en) * 2014-10-15 2019-01-08 Continental Automotive Gmbh High pressure pump for a fuel injection system of an internal combustion engine
US10208725B2 (en) 2014-10-15 2019-02-19 Continental Automotive Gmbh High pressure fuel pump and associated drive device

Also Published As

Publication number Publication date
FR1166197A (fr) 1958-11-04
DE1096114B (de) 1960-12-29

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