WO1981001593A1 - Rocker arm driven fuel pump - Google Patents

Rocker arm driven fuel pump Download PDF

Info

Publication number
WO1981001593A1
WO1981001593A1 PCT/US1979/001092 US7901092W WO8101593A1 WO 1981001593 A1 WO1981001593 A1 WO 1981001593A1 US 7901092 W US7901092 W US 7901092W WO 8101593 A1 WO8101593 A1 WO 8101593A1
Authority
WO
WIPO (PCT)
Prior art keywords
cam
fuel pump
rocker
engine
arm
Prior art date
Application number
PCT/US1979/001092
Other languages
French (fr)
Inventor
S Hanshaw
C Mcclung
Original Assignee
S Hanshaw
C Mcclung
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 S Hanshaw, C Mcclung filed Critical S Hanshaw
Priority to PCT/US1979/001092 priority Critical patent/WO1981001593A1/en
Publication of WO1981001593A1 publication Critical patent/WO1981001593A1/en

Links

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
    • 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
    • F02M37/06—Feeding by means of driven pumps mechanically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus

Definitions

  • This invention relates generally to a fuel pump for an internal combustion engine and, more par ⁇ ticularly, to a fuel pump that is driven by a rocker arm.
  • An internal combustion engine has a fuel pump for moving fuel from a tank to a carburetor or to a fuel injection pump.
  • a cam on a rotating camshaft of the engine contacts the actuator arm on the fuel pump for driving the fuel pump. Since the camshaft of the engine is in the lower portion of the engine, the fuel pump which is directly driven by the camshaft is inherently located on the lower portion of the engine in a relatively inaccessible position.
  • the present invention is directed to over ⁇ coming one or more of the problems as set forth above.
  • a fuel pump is driven by a cam carried by a rocker arm associated with one of the valve actuating assemblies of the engine.
  • the fuel pump is mounted on the engine either directly or through an adaptor so that a spring- biased actuating arm by which the fuel pump is driven extends into contact with the cam carried by the rocker arm.
  • the reciprocating motion of the rocker arm and cam forces the actuating arm to oscillate or recipro ⁇ cate back and forth, thereby driving the fuel pump.
  • valve actuating assemblies are located on the upper portion of the engine where they are readily accessible for service.
  • the fuel pump By mounting the fuel pump in close proximity to the valve actuating assemblies, locates the fuel pump on the upper portion of the engine where it is readily accessible for service, repair or replacement.
  • Fig. 1 is a partial sectional view of a por ⁇ tion of an internal combustion engine showing a rocker arm driven fuel pump forming an embodiment of the present invention
  • Fig. 2 is a perspective view of a cam and rocker arm broken away from the engine;
  • Fig. 3 is a broken away perspective view of the rocker arm, lift and tappet assembly with the cam on the rocker in contact with a portion of the actuat- ing arm of the fuel pump;
  • Fig. 4 is an enlarged elevational view of the cam and actuating arm of the present invention.
  • a fuel pump is generally indicated by the reference numeral 10 and is mounted on an upper portion 11 of an internal com ⁇ bustion engine 12.
  • the fuel pump 10 is of conventional
  • the fuel pump 10 has a housing 15 in which a shaft 16 is pivotally mounted.
  • the actuating arm 14 is secured to the shaft 16 and is biased by a spring (not shown) so that oscillation or reciprocation of the actuating arm 14 will drive the fuel pump 10.
  • the actuating arm 14 extends from the shaft 16 through an opening 18 in an adaptor 17 secured to the housing 15 with a portion 19 of the arm extending outwardly from the housing 15 and adaptor 17 and having an angled con ⁇ tact pad or cam follower surface 21 thereon.
  • the fuel pump 10 receives fuel through tube 23 from a fuel tank (not shown) and pumps said fuel on to a carburetor or fuel injection pump of the engine,
  • the engine 12 includes a valve actuating assembly, generally designated 20, associated with the cylinders (not shown) of the engine 12.
  • the valve actuating assembly 20 includes a conventional rocker shaft 24 secured by bolts 25 and mounting blocks 27 to the cylinder head 29.
  • a plurality of rocker arms 22, one being shown, are mounted on the rocker shaft 24 for pivotal movement about the axis of said shaft.
  • Each rocker arm 22 has a rod end portion 31 and a valve end portion 33.
  • a tappet assembly 35 bears against a cam 44 on the engine camshaft (not shown) and has a socket in which is seated one end of a rod 32.
  • the other end of rod 32 has a socket 36 which receives one end of an adjustable link 43 which passes through an opening 37 in the rod erid portion 31 of rocker arm 22
  • valve stem 38 is engaged by the valve end portion 33 of the rocker arm 22.
  • Conventional rotation of the engine camshaft reciprocates the tappet assemblies 35 and rods 32 to oscillate the rocker arms 22 about the rocker shaft 24 to actuate the valve stems 38 and valves (not shown) .
  • the rocker arm 22 has a cam 26 extending transversely to the longitudinal axis of the rocker arm 22 from the rod end portion 31 thereof.
  • the cam 26 in the illustrated embodiment, is integrally formed on the side of the rod end portion 31 of the rocker arm 22 and is offset from the pivotal mounting of the rocker arm 22 about the shaft 24.
  • the base 39 of the cam 26 joins the rocker arm 22 in close proximity to the connection between the rod 32 and the rod end por ⁇ tion 31.
  • the cam 26 has a cam surface 41 which, in the illustrated embodiment, is crowned and curved and contacts the cam follower surface 21 on the actuator arm 14.
  • the shape of the cam surface 41 is such that it provides substantially sliding contact with the cam follower surface-.21 as the rocker arm 22 oscillates or reciprocates about the axis of the rocker shaft 24.
  • the rotational motion of the camshaft reciprocates the tappet assembly 35 and rod 32 to provide the oscillat ⁇ ing motion to the rocker arm 22.
  • valve actuating assembly 20 Enclosing the valve actuating assembly 20 is a cover 40 which is attached by bolts 42 to the cyl ⁇ inder head 29. An aperture 46 through the cover 40 aligns with the opening 18 in the housing 15 of the fuel pump 10 to permit access for the end portion 19 of the actuator arm 14. As illustrated, the fuel pump 10 is mounted on the adaptqr 17 which in turn is mounted on the cover 40 by suitable means so that the actuating
  • OMPI arm 14 extends into the space enclosed by the cover 40 with cam follower surface 21 in contact with cam sur ⁇ face 41 of cam 26,
  • the fuel pump 10 may be mounted on other portions of the upper portion of the engine 12 as long as the actuating arm 14 of the fuel pump 10 can contact a reciprocating portion of the rocker arm 22 and as long as the fuel pump 10 is in an accessible location on the engine.
  • the use of the adaptor 17 is optional depending upon the mounting requirements.
  • the tappet assembly 35 tracks a cam surface on the camshaft and converts the rotational motion of the camshaft into translational reciprocating motion of the rod 32.
  • the rod 32 imparts the reciprocating motion to the rocker arm 22 to operate the valve stem 38 in a conventional fashion.
  • the cam 26 on the rocker arm 22 drives the actuating arm 14 of the fuel pump 10, thereby actuating the pump.
  • the curved cam surface 41 provides a smooth contacting surface which principally slides against the cam follower sur ⁇ face 21 on the actuating arm 14 as the rocker arm 22 oscillates about the axis of the rocker shaft 24.
  • the fuel pump is located on the lower portion of the engine block and has the cam follower surface riding directly on a cam on the camshaft. When located in this position, difficulty is encountered in reaching the fuel pump because of the crowded condition of the engine compartment.
  • the present invention overcomes this disadvantage by allow ⁇ ing the fuel pump to be placed on the upper portion of
  • the fuel pump can be driven off any one of the plurality of rocker arms of the engine. This affords flexibility in determining location and access ⁇ ibility of the fuel pump.

Landscapes

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

Abstract

A fuel pump (10) is driven by a rocker arm (22) oscillatably mounted on the head of an internal combustion engine (12). The fuel pump (10) is mounted on an upper portion (11) of the engine (12) with an actuating arm (14) of the fuel pump (10) extending into position to be contacted by a cam (26) carried by the rocker arm (22). The oscillating motion of the rocker arm (22) and cam (26) forces the actuating arm (14) to oscillate thereby actuating the fuel pump (10) The fuel pump (10) can be driven by any one of the rocker arms (22) on the engine (12), thereby allowing flexibility in locating the fuel pump (10) in an accessible location.

Description

Description
Rocker Arm Driven Fuel Pu p
Technical Field
This invention relates generally to a fuel pump for an internal combustion engine and, more par¬ ticularly, to a fuel pump that is driven by a rocker arm.
Background Art
An internal combustion engine has a fuel pump for moving fuel from a tank to a carburetor or to a fuel injection pump. A cam on a rotating camshaft of the engine contacts the actuator arm on the fuel pump for driving the fuel pump. Since the camshaft of the engine is in the lower portion of the engine, the fuel pump which is directly driven by the camshaft is inherently located on the lower portion of the engine in a relatively inaccessible position.
Although the prior art apparatus effectively delivers f el to- the engine, one of the problems en- countered therewith is that, owing to the inaccess¬ ibility of the fuel pump, it cannot be easily inspected and serviced.
It is desirable to locate the fuel pump in a more accessible position preferably at or near the upper portion of the engine.
The present invention is directed to over¬ coming one or more of the problems as set forth above.
Disclosure of Invention In one aspect of the present invention, a fuel pump is driven by a cam carried by a rocker arm associated with one of the valve actuating assemblies of the engine. The fuel pump is mounted on the engine either directly or through an adaptor so that a spring- biased actuating arm by which the fuel pump is driven extends into contact with the cam carried by the rocker arm. The reciprocating motion of the rocker arm and cam forces the actuating arm to oscillate or recipro¬ cate back and forth, thereby driving the fuel pump.
In most engines of current design, the valve actuating assemblies are located on the upper portion of the engine where they are readily accessible for service. By mounting the fuel pump in close proximity to the valve actuating assemblies, locates the fuel pump on the upper portion of the engine where it is readily accessible for service, repair or replacement.
Brief Description of the Drawings
Fig. 1 is a partial sectional view of a por¬ tion of an internal combustion engine showing a rocker arm driven fuel pump forming an embodiment of the present invention; Fig. 2 is a perspective view of a cam and rocker arm broken away from the engine;
Fig. 3 is a broken away perspective view of the rocker arm, lift and tappet assembly with the cam on the rocker in contact with a portion of the actuat- ing arm of the fuel pump; and
Fig. 4 is an enlarged elevational view of the cam and actuating arm of the present invention.
Best Mode for Carrying Out the Invention
Referring to Figs. 1 through 4, a fuel pump is generally indicated by the reference numeral 10 and is mounted on an upper portion 11 of an internal com¬ bustion engine 12. The fuel pump 10 is of conventional
O PI
^ w construction and includes an outwardly extending actuat¬ ing arm 14 by which the fuel pump 10 is driven. As the particular construction and operation of the fuel pump 10 forms no part of this invention, it will not be des- cribed in detail except for those parts that are neces¬ sary for an understanding of the invention.
The fuel pump 10 has a housing 15 in which a shaft 16 is pivotally mounted. The actuating arm 14 is secured to the shaft 16 and is biased by a spring (not shown) so that oscillation or reciprocation of the actuating arm 14 will drive the fuel pump 10. The actuating arm 14 extends from the shaft 16 through an opening 18 in an adaptor 17 secured to the housing 15 with a portion 19 of the arm extending outwardly from the housing 15 and adaptor 17 and having an angled con¬ tact pad or cam follower surface 21 thereon. The fuel pump 10 receives fuel through tube 23 from a fuel tank (not shown) and pumps said fuel on to a carburetor or fuel injection pump of the engine, The engine 12 includes a valve actuating assembly, generally designated 20, associated with the cylinders (not shown) of the engine 12. The valve actuating assembly 20 includes a conventional rocker shaft 24 secured by bolts 25 and mounting blocks 27 to the cylinder head 29. A plurality of rocker arms 22, one being shown, are mounted on the rocker shaft 24 for pivotal movement about the axis of said shaft. Each rocker arm 22 has a rod end portion 31 and a valve end portion 33. A tappet assembly 35 bears against a cam 44 on the engine camshaft (not shown) and has a socket in which is seated one end of a rod 32. The other end of rod 32 has a socket 36 which receives one end of an adjustable link 43 which passes through an opening 37 in the rod erid portion 31 of rocker arm 22
_ OMPI and is adjustably secured to the rocker arm 22 by a lock nut 34. A valve stem 38 is engaged by the valve end portion 33 of the rocker arm 22. Conventional rotation of the engine camshaft reciprocates the tappet assemblies 35 and rods 32 to oscillate the rocker arms 22 about the rocker shaft 24 to actuate the valve stems 38 and valves (not shown) .
The rocker arm 22 has a cam 26 extending transversely to the longitudinal axis of the rocker arm 22 from the rod end portion 31 thereof. The cam
26, in the illustrated embodiment, is integrally formed on the side of the rod end portion 31 of the rocker arm 22 and is offset from the pivotal mounting of the rocker arm 22 about the shaft 24. The base 39 of the cam 26 joins the rocker arm 22 in close proximity to the connection between the rod 32 and the rod end por¬ tion 31. The cam 26 has a cam surface 41 which, in the illustrated embodiment, is crowned and curved and contacts the cam follower surface 21 on the actuator arm 14. The shape of the cam surface 41 is such that it provides substantially sliding contact with the cam follower surface-.21 as the rocker arm 22 oscillates or reciprocates about the axis of the rocker shaft 24. The rotational motion of the camshaft reciprocates the tappet assembly 35 and rod 32 to provide the oscillat¬ ing motion to the rocker arm 22.
Enclosing the valve actuating assembly 20 is a cover 40 which is attached by bolts 42 to the cyl¬ inder head 29. An aperture 46 through the cover 40 aligns with the opening 18 in the housing 15 of the fuel pump 10 to permit access for the end portion 19 of the actuator arm 14. As illustrated, the fuel pump 10 is mounted on the adaptqr 17 which in turn is mounted on the cover 40 by suitable means so that the actuating
OMPI arm 14 extends into the space enclosed by the cover 40 with cam follower surface 21 in contact with cam sur¬ face 41 of cam 26, The fuel pump 10 may be mounted on other portions of the upper portion of the engine 12 as long as the actuating arm 14 of the fuel pump 10 can contact a reciprocating portion of the rocker arm 22 and as long as the fuel pump 10 is in an accessible location on the engine. The use of the adaptor 17 is optional depending upon the mounting requirements.
Industrial Applicability
In operation, as the camshaft (not shown) is driven by the internal combustion engine 12, the tappet assembly 35 tracks a cam surface on the camshaft and converts the rotational motion of the camshaft into translational reciprocating motion of the rod 32. The rod 32 imparts the reciprocating motion to the rocker arm 22 to operate the valve stem 38 in a conventional fashion. As the rocker arm 22 reciprocates about the rocker shaft 24, the cam 26 on the rocker arm 22 drives the actuating arm 14 of the fuel pump 10, thereby actuating the pump. As best seen in Fig. 4, the curved cam surface 41 provides a smooth contacting surface which principally slides against the cam follower sur¬ face 21 on the actuating arm 14 as the rocker arm 22 oscillates about the axis of the rocker shaft 24.
In prior designs, the fuel pump is located on the lower portion of the engine block and has the cam follower surface riding directly on a cam on the camshaft. When located in this position, difficulty is encountered in reaching the fuel pump because of the crowded condition of the engine compartment. The present invention overcomes this disadvantage by allow¬ ing the fuel pump to be placed on the upper portion of
OMPI
^mn'Φ the engine where it is in a more accessible position. Furthermore, the fuel pump can be driven off any one of the plurality of rocker arms of the engine. This affords flexibility in determining location and access¬ ibility of the fuel pump.
Other aspects, objects and advantages of this invention can be obtained from a study of the drawings, the disclosure and the appended claims.
OMPI . WIPO -v

Claims

Claims
1. In an internal combustion engine (.12) having at least one rocker arm (22) pivotally mounted on a rocker shaft (.24) carried by the upper portion (11) of said engine (12) , and a fuel pump (10) mounted on said engine (12) for pumping fuel from a storage area to a carburetor or fuel injection pump on said engine (12) , in combination: a cam (26) carried by said rocker arm (22) , and an actuating arm (14) mounted on said fuel pump (10) and extending into position to contact said cam (26) , whereby movement of said rocker arm (22) moves said cam (26) to actuate said fuel pump (10) .
2. In an internal combustion engine as claimed in claim 1 wherein said cam (26) is integrally formed on the side of one end (31) of the rocker arm (22).
3. In an internal combustion engine as claimed in claim 1 wherein said cam (26) has a curved cam surface (41) and wherein said actuator arm (14) has a cam follower surface (21) which substantially slides on said curved cam surface (41) as the rocker arm (22) oscillates said cam (26) about the axis of said rocker shaft (24) .
4. In an internal combustion engine as claimed in claim 1 wherein a cover (40) is carried by the engine (12) to enclose the rocker shaft (24) and rocker arms (22) and wherein said fuel pump (10) is mounted on said cover (40) so as to be easily access- ible for service.
5. An internal combustion engine (.12) having a plurality of rocker arms (22) pivotally mounted on a rocker shaft (24) carried by the upper portion (11) of said engine (12) , a cover (.40) enclosing said rocker arms (22) and said rocker shaft (24) , a fuel pump (10) mounted on said cover (40) for pumping fuel from a storage area to a carburetor or fuel injection pump on said engine (12) , a cam (26) carried by one of said rocker arms
(22), and an actuating arm (14) extending from said fuel pump (10) and through said cover (40) into con¬ tact with said cam (26) , whereby movement of said rocker arm (22) and said .cam (26) actuates said fuel pump (10) .
6. An internal combustion engine as claimed in claim 5 wherein a tappet (35) and a rod (32) are reciprocated by said engine (12) , said rod (32) con- tacts said one of said rocker arms (22) to oscillate said rocker arm -(22) about the axis of the rocker shaft (24) .
7. An internal combustion engine as claimed in claim 5 wherein said cam (26) is integrally formed on the side of one end (31) of said one of said rocker arms (22) .
8. An internal combustion engine as claimed in claim 5 wherein said cam (26) has a curved cam sur¬ face (41) and wherein said actuator arm (14) has a cam follower surface (21) which isubstantiall -slides on said curved cam surface (41) as said one of said rocker arms (22) and said cam (26) oscillate about the axis of said rocker shaft (24) .
OMPI
PCT/US1979/001092 1979-11-30 1979-11-30 Rocker arm driven fuel pump WO1981001593A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1979/001092 WO1981001593A1 (en) 1979-11-30 1979-11-30 Rocker arm driven fuel pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
WOUS79/01092 1979-11-30
PCT/US1979/001092 WO1981001593A1 (en) 1979-11-30 1979-11-30 Rocker arm driven fuel pump

Publications (1)

Publication Number Publication Date
WO1981001593A1 true WO1981001593A1 (en) 1981-06-11

Family

ID=22147825

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1979/001092 WO1981001593A1 (en) 1979-11-30 1979-11-30 Rocker arm driven fuel pump

Country Status (1)

Country Link
WO (1) WO1981001593A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4444162A (en) * 1981-04-10 1984-04-24 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with a secondary aggregate
US4448166A (en) * 1980-11-28 1984-05-15 Yanmar Diesel Engine Co., Ltd. Overhead cam type diesel engine
US4458641A (en) * 1982-11-13 1984-07-10 Ford Motor Company Internal combustion engine
US5323750A (en) * 1993-08-25 1994-06-28 Kohler Co. Integral engine valve cover and fuel pump
US5390642A (en) * 1992-04-11 1995-02-21 Mercedes-Benz Ag Fuel injection system arrangement for an internal combustion engine
US6082336A (en) * 1996-03-18 2000-07-04 Sanshin Kogyo Kabushiki Kaisha Fuel pump arrangement for engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL104807C (en) *
DE474648C (en) * 1926-03-02 1929-04-11 Maschf Augsburg Nuernberg Ag Starting procedure for internal combustion engines
US1758687A (en) * 1928-03-21 1930-05-13 Alan Ernest L Chorlton Governor-pump aggregate
US2482332A (en) * 1946-11-08 1949-09-20 Ford Motor Co Fuel pump and distributor drive
US2955582A (en) * 1957-06-21 1960-10-11 Gen Motors Corp Timed fuel injection system
US3638628A (en) * 1970-09-18 1972-02-01 Henry Stanford Stolworthy Fuel control assembly for internal combustion engines having fuel injectors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL104807C (en) *
DE474648C (en) * 1926-03-02 1929-04-11 Maschf Augsburg Nuernberg Ag Starting procedure for internal combustion engines
US1758687A (en) * 1928-03-21 1930-05-13 Alan Ernest L Chorlton Governor-pump aggregate
US2482332A (en) * 1946-11-08 1949-09-20 Ford Motor Co Fuel pump and distributor drive
US2955582A (en) * 1957-06-21 1960-10-11 Gen Motors Corp Timed fuel injection system
US3638628A (en) * 1970-09-18 1972-02-01 Henry Stanford Stolworthy Fuel control assembly for internal combustion engines having fuel injectors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4448166A (en) * 1980-11-28 1984-05-15 Yanmar Diesel Engine Co., Ltd. Overhead cam type diesel engine
US4444162A (en) * 1981-04-10 1984-04-24 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with a secondary aggregate
US4458641A (en) * 1982-11-13 1984-07-10 Ford Motor Company Internal combustion engine
US5390642A (en) * 1992-04-11 1995-02-21 Mercedes-Benz Ag Fuel injection system arrangement for an internal combustion engine
US5323750A (en) * 1993-08-25 1994-06-28 Kohler Co. Integral engine valve cover and fuel pump
US6082336A (en) * 1996-03-18 2000-07-04 Sanshin Kogyo Kabushiki Kaisha Fuel pump arrangement for engine

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