US3855981A - Rocker arm - Google Patents

Rocker arm Download PDF

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Publication number
US3855981A
US3855981A US00360489A US36048973A US3855981A US 3855981 A US3855981 A US 3855981A US 00360489 A US00360489 A US 00360489A US 36048973 A US36048973 A US 36048973A US 3855981 A US3855981 A US 3855981A
Authority
US
United States
Prior art keywords
rocker arm
cylinder head
pad
reservoir
internal combustion
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
US00360489A
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English (en)
Inventor
F Loon
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.)
Ford Motor Co
Original Assignee
Ford Motor Co
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 Ford Motor Co filed Critical Ford Motor Co
Priority to US00360489A priority Critical patent/US3855981A/en
Priority to CA189,190A priority patent/CA993747A/en
Priority to DE2419219A priority patent/DE2419219A1/de
Priority to GB1858874A priority patent/GB1437285A/en
Priority to BR3664/74A priority patent/BR7403664D0/pt
Priority to JP5295274A priority patent/JPS5619451B2/ja
Application granted granted Critical
Publication of US3855981A publication Critical patent/US3855981A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/106—Oil reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/101—Lubrication of valve gear or auxiliaries of cam surfaces

Definitions

  • the passage may in- 2,000,635- 5/1935 Edwards 123/9036 elude an oil reservoir beneath the cam pad which re- 19 Sp 1 123/ tains a predetermined quantity of oil when the engine 2,322,172 p 123/'90-36 is not in operation and which provides essentially instantaneous lubrication to the cam pad and cam surpencer juxtapos- 2,385,309 9/1945 Spencer t 123/9036 face upon Start up of the engme' 2,435,727 2/1948 Spencer 123/9036 7 Claims, 4 Drawing Figures /7 i4' i i l l 1 1 --f 1/ if I -I I C j;
  • An internal combustion engine having an overhead camshaft generally incorporates a system to provide lubrication to the mating cam and rocker arm surfaces.
  • oil is provided through the camshaft mounting supports to an axial passage formed -within the camshaft and is discharged form ports open-
  • This invention provides a cam lubrication system which receives lubricating oil from the rocker arm fulcrum member and which overcomes certain disadvantages associated with both the prior art systems identified previously.
  • This invention provides a rocker arm and cam surface lubrication system which instantaneously supplies oil to the sliding surfaces upon initial engine start-up and which significantly reduces oil delivery delay often experienced in prior art systems.
  • This invention also provides a lubrication system in which oil is provided to the cam and rocker arm interface during 360 of camshaft rotation. Furthermore, this invention provides a rocker arm incorporating a lubrication system which funtions identically for either direction of rotation of the camshaft. This invention also provides a rocker arm having an oil supply port that delivers oil at a location on the cam surface to most effectively carry away and dissipate heat generated by the mating surfaces.'Finally, this invention provides a rocker arm construction which may be either cast or fabricated from stamped elements and which is economical to produce and reliable in operation.
  • a rocker arm constructed in accordance with this invention has a first end pivotally connected to a fulcrum member mounted to the cylinder head. The other end of the rocker arm is engageable with the protruding end of the valve stem or valve assembly.
  • a camshaft is slidingly engageable with a cam pad formed on the rocker arm at a point between the two previously mentioned ends.
  • An oil passage is formed in the rocker arm having an inlet receiving oil from the fulcrum member and an outlet on the cam pad immediately beneath the engaged portion of the cam surface.
  • the passage within the rocker arm may include an enlarged reservoir positioned immediately beneath the outlet to the cam surface.
  • FIG. 1 is a cross sectional view with portions in elevation of a valve actuating mechanism including a rocker 4--4 of FIG. 3.
  • Reference numeral 11 of the drawings refers to a portion of a cylinder head of an internal combustion engine having an overhead camshaft l3.
  • an intake or exhaust valve assembly 17 having a stem 19 protruding upwardly from the cylinder head.
  • the valve assembly 17 includes a retainer assembly 25 which comprises a coiled compression spring 21 between itself and a seat 23 formed in the cylinder head surface.
  • a second bore 27 Spaced from bore 15 and coplanar therewith is a second bore 27 which receives the rocker arm fulcrum member or pivot support member 29.
  • the fulcrum member may be a threaded stud or a hydraulic lash adjuster as shown in FIG.
  • the protruding end of the fulcrum member is a convex spherical surface 31 having an oil outlet port 33 formed therein.
  • the oil outlet port is connected through the fulcrum member to a source of pressurized oil 35 within the cylinder head.
  • rocker arm has a concave spherical surface or socket 39 formed in the underside of one end corresponding in size to the spherical surface 19 of the fulcrum member.
  • a slightly convex surface or pad 41 that engages the upper element 43 of the valve assembly.
  • the camshaft 13 Mounted to the cylinder head 11 to rotate about an axis perpendicular to the plane formed by the axis of the valve stem 19 and the fulcrum member 29 is the camshaft 13.
  • the camshaft has a cam surface 45 which slidingly engages the pad 47 formed on the upper side of the rocker arm.
  • an oil inlet 49 formed in the socket 39 of the rocker arm.
  • An oil discharge port '51 is formed centrally within the cam pad 47 of the rocker arm immediately beneath the engaged portion of the cam surface 45. lnterconnecting the discharge port 51 with the inlet 49 is a passage 53. Immediately beneath the discharge port and the cam pad and forming a portion of passage 53 is an enlarged reservoir 55. A plug 57 closes the bottom of the reservoir.
  • the inlet 49 is of sufficient height so that when the engine is not in operation the reservoir retains a substantial quantity of lubricating oil.
  • the rocker arm I 37 is a casting having the oil ports and passages formed by boring.
  • An alternate embodiment is shown in FIGS. 3 and 4 of the drawings and comprises a functionally equivalent stamped version of the rocker arm.
  • the stamped rocker arm 59 includes an outer member 61 and an inner member 63 welded in place within the enclosure of the outer member.
  • the spherical socket 65 engaging the fulcrum member 29 is stamped into the inner member and'includes a centrally located inlet port 67.
  • the valve stem engaging portion 69 comprises a channel which fits over a raised portion 73 of valve assembly element 71.
  • the cam pad 75 is a slightly convex portion of the upper surface of the outer memberv 61 as shown in FIG. 3. An oil discharge port.
  • the inlet 67 is positioned so that the reservoir 79 retains a substantial portion of lubricating oil when the engine is not in operation.
  • fulcrum member may be provided with a check valve (not shown) to prevent siphoning of oil from the interior of the rocker arm to the fulcrum member 29 and cylinder head passages 35.
  • the oil in the reservoir 55 or 79 is instantaneously splashed or vibrated through discharge port 51 or 77, respectively, onto the cam surface 45.
  • the cam and rocker arm engaging portions receive lubricating oil immediately without delay while the oil is pumped through the lubricating system through the pivot stud and into the cam lubricating passage.
  • lubricating oil is provided to the cam and rocker arm at times when it is most likely to be devoid of lubrication and when it is most susceptible to damage by scratching.
  • a poppet valve assembly having a stem reciprocably mounted in said cylinder head, a camshaft rotatably mounted to said cylinder head, and a fulcrum member mounted to said cylinder head,
  • rocker arm having a first end portion connected to said fulcrum member and a second end portion engageable with the end of said valve assembly
  • said passage having outlet means formed in and located at the camshaft engaging area of said rocker arm,
  • said rocker arm receiving oil from said fulcrum member for discharge from said outlet directly against said camshaft.
  • said passage including an enlarged reservoir within said rocker arm.
  • said reservoir being positioned immediately upstream of said outlet means.
  • valve assembly reciprocably mounted within the cylinder head, said valve assembly having an end portion protruding from said cylinder head, a fulcrum member having a portion received within said cylinder head and a portion protruding therefrom having a convex spherical end,
  • rocker arm extending from the end said fulcrum member to said valve assembly, said rocker arm having a spherical socket at one end positionable over and corresponding to the convex spherical end of said fulcrum member,
  • said rocker arm having a first pad at its other end engageable with the end portion of said valve assembly
  • said camshaft including a cam surface slidably contacting a portion of said second pad
  • said passage including a reservoir immediately beneath the discharge port of the rocker arm.
  • said passage including said reservoir having a configuration which precludes said reservoir from complete draining throughsaid inlet port of the rocker arm when the engine is not in operation.
  • a portion of said reservoir being located below a horizontal line through the inlet port of the rocker arm to prevent drainage from said reservoir portion

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
US00360489A 1973-05-15 1973-05-15 Rocker arm Expired - Lifetime US3855981A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00360489A US3855981A (en) 1973-05-15 1973-05-15 Rocker arm
CA189,190A CA993747A (en) 1973-05-15 1973-12-28 Rocker arm for an internal combustion engine with an overhead camshaft
DE2419219A DE2419219A1 (de) 1973-05-15 1974-04-22 Verbrennungskraftmaschine mit obenliegender nockenwellenanordnung
GB1858874A GB1437285A (en) 1973-05-15 1974-04-29 Internal combustion engine
BR3664/74A BR7403664D0 (pt) 1973-05-15 1974-05-07 Motor de combustao interna
JP5295274A JPS5619451B2 (enExample) 1973-05-15 1974-05-14

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00360489A US3855981A (en) 1973-05-15 1973-05-15 Rocker arm

Publications (1)

Publication Number Publication Date
US3855981A true US3855981A (en) 1974-12-24

Family

ID=23418179

Family Applications (1)

Application Number Title Priority Date Filing Date
US00360489A Expired - Lifetime US3855981A (en) 1973-05-15 1973-05-15 Rocker arm

Country Status (6)

Country Link
US (1) US3855981A (enExample)
JP (1) JPS5619451B2 (enExample)
BR (1) BR7403664D0 (enExample)
CA (1) CA993747A (enExample)
DE (1) DE2419219A1 (enExample)
GB (1) GB1437285A (enExample)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098240A (en) * 1975-02-18 1978-07-04 Eaton Corporation Valve gear and lash adjustment means for same
US4167931A (en) * 1977-03-09 1979-09-18 Nissan Motor Company, Limited Apparatus to control fuel supply to a multicylinder internal combustion engine by disabling one or more engine cylinders in certain engine operating conditions
US4245523A (en) * 1975-10-02 1981-01-20 Toledo Stamping & Manufacturing Company Rocker arm
US4436062A (en) 1980-11-14 1984-03-13 Toyota Jidosha Kogyo Kabushiki Kaisha Rocker arm mechanism in overhead cam type engine
US4589383A (en) * 1983-06-09 1986-05-20 Automotive Engine Associates Squeeze film rocker tip
US4592314A (en) * 1985-04-18 1986-06-03 Yamaha Hatsudoki Kabushiki Kaisha Valve actuating mechanism for internal combustion engine
US4624223A (en) * 1980-03-27 1986-11-25 Toledo Stamping & Manufacturing Company Rocker arm and method of making same
DE3743854A1 (de) * 1987-12-23 1989-07-06 Michael Stirm Vierventilsteuerung mit oberen abstuetzelementen
US5038726A (en) * 1990-08-30 1991-08-13 Henley Manufacturing Holding Company, Inc. Rocker arm with integral ball pivot socket
US5172663A (en) * 1991-01-31 1992-12-22 Suzuki Motor Corporation Valve gear lubricating device of engine
US5996541A (en) * 1996-11-29 1999-12-07 Volkswagen Ag Valve control arrangement for an internal combustion engine having lift valves
EP1046791A3 (en) * 1999-04-23 2002-08-21 Delphi Technologies, Inc. Rocker arm assembly lubrication
WO2005005787A1 (de) * 2003-07-09 2005-01-20 Ina-Schaeffler Kg Verfahren zur herstellung eines aussenhebels eines schaltbaren schlepphebels
US6871622B2 (en) 2002-10-18 2005-03-29 Maclean-Fogg Company Leakdown plunger
US7028654B2 (en) 2002-10-18 2006-04-18 The Maclean-Fogg Company Metering socket
WO2006063673A1 (de) * 2004-12-14 2006-06-22 Daimlerchrysler Ag Nockenfolger zur betätigung eines gaswechselventiles einer brennkraftmaschine
US7128034B2 (en) 2002-10-18 2006-10-31 Maclean-Fogg Company Valve lifter body
US7191745B2 (en) 2002-10-18 2007-03-20 Maclean-Fogg Company Valve operating assembly
US7273026B2 (en) 2002-10-18 2007-09-25 Maclean-Fogg Company Roller follower body
CN102235191A (zh) * 2010-05-06 2011-11-09 谢夫勒科技有限两合公司 气门摇臂
CN104481622A (zh) * 2014-11-20 2015-04-01 绵阳富临精工机械股份有限公司 一种无滚子气门摇臂及其加工方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939705C2 (de) * 1979-09-29 1982-11-11 Adam Opel AG, 6090 Rüsselsheim Anordnung zur Schmierung der Berührungsflächen zwischen Nocken und Ventilsteuerungshebeln bei Brennkraftmaschinen
US4430783A (en) * 1980-03-27 1984-02-14 Toledo Stamping & Manufacturing Company Method of making a rocker arm
JPS5818858U (ja) * 1981-07-30 1983-02-05 豊田工機株式会社 ステアリングロツク装置
GB2179700B (en) * 1985-08-29 1989-08-09 Nissan Motor Rocker arm arrangement for multi-valve internal combustion engine
US5588413A (en) * 1995-03-14 1996-12-31 Caterpillar Inc. Engine assembly with leaf spring cam follower
DE19624413A1 (de) * 1996-06-19 1998-01-02 Schaeffler Waelzlager Kg Verfahren zum Herstellen einer Schmiermittelbohrung in einem Kipp- oder Schlepphebel
WO2013051111A1 (ja) * 2011-10-04 2013-04-11 日鍛バルブ株式会社 動弁装置のロッカアーム
DE102013221256A1 (de) * 2013-10-21 2015-04-23 Schaeffler Technologies Gmbh & Co. Kg Hebelartiger Nockenfolger

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2000635A (en) * 1931-12-14 1935-05-07 Packard Motor Car Co Internal combustion engine
US2209479A (en) * 1938-06-07 1940-07-30 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322172A (en) * 1941-09-17 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322173A (en) * 1941-12-24 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322174A (en) * 1941-09-17 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2385309A (en) * 1944-09-18 1945-09-18 Spencer Aircraft Motors Inc Valve actuating mechanism
US2435727A (en) * 1946-05-10 1948-02-10 Spencer Aircraft Motors Inc Valve actuating mechanism
US3153404A (en) * 1963-12-30 1964-10-20 Gen Motors Corp Hydraulic lash adjuster
US3314404A (en) * 1966-03-21 1967-04-18 Earl A Thompson Engine valve operating mechanism
US3400696A (en) * 1966-01-05 1968-09-10 Thompson Mfg Co Earl A Valve train
US3502058A (en) * 1966-02-24 1970-03-24 Earl A Thompson Rocker arm

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2000635A (en) * 1931-12-14 1935-05-07 Packard Motor Car Co Internal combustion engine
US2209479A (en) * 1938-06-07 1940-07-30 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322172A (en) * 1941-09-17 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322174A (en) * 1941-09-17 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2322173A (en) * 1941-12-24 1943-06-15 Spencer Aircraft Motors Inc Valve actuating mechanism
US2385309A (en) * 1944-09-18 1945-09-18 Spencer Aircraft Motors Inc Valve actuating mechanism
US2435727A (en) * 1946-05-10 1948-02-10 Spencer Aircraft Motors Inc Valve actuating mechanism
US3153404A (en) * 1963-12-30 1964-10-20 Gen Motors Corp Hydraulic lash adjuster
US3400696A (en) * 1966-01-05 1968-09-10 Thompson Mfg Co Earl A Valve train
US3502058A (en) * 1966-02-24 1970-03-24 Earl A Thompson Rocker arm
US3314404A (en) * 1966-03-21 1967-04-18 Earl A Thompson Engine valve operating mechanism

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098240A (en) * 1975-02-18 1978-07-04 Eaton Corporation Valve gear and lash adjustment means for same
US4245523A (en) * 1975-10-02 1981-01-20 Toledo Stamping & Manufacturing Company Rocker arm
US4167931A (en) * 1977-03-09 1979-09-18 Nissan Motor Company, Limited Apparatus to control fuel supply to a multicylinder internal combustion engine by disabling one or more engine cylinders in certain engine operating conditions
US4624223A (en) * 1980-03-27 1986-11-25 Toledo Stamping & Manufacturing Company Rocker arm and method of making same
US4436062A (en) 1980-11-14 1984-03-13 Toyota Jidosha Kogyo Kabushiki Kaisha Rocker arm mechanism in overhead cam type engine
US4589383A (en) * 1983-06-09 1986-05-20 Automotive Engine Associates Squeeze film rocker tip
US4592314A (en) * 1985-04-18 1986-06-03 Yamaha Hatsudoki Kabushiki Kaisha Valve actuating mechanism for internal combustion engine
DE3743854A1 (de) * 1987-12-23 1989-07-06 Michael Stirm Vierventilsteuerung mit oberen abstuetzelementen
US5038726A (en) * 1990-08-30 1991-08-13 Henley Manufacturing Holding Company, Inc. Rocker arm with integral ball pivot socket
US5172663A (en) * 1991-01-31 1992-12-22 Suzuki Motor Corporation Valve gear lubricating device of engine
US5996541A (en) * 1996-11-29 1999-12-07 Volkswagen Ag Valve control arrangement for an internal combustion engine having lift valves
EP1046791A3 (en) * 1999-04-23 2002-08-21 Delphi Technologies, Inc. Rocker arm assembly lubrication
US7273026B2 (en) 2002-10-18 2007-09-25 Maclean-Fogg Company Roller follower body
US6871622B2 (en) 2002-10-18 2005-03-29 Maclean-Fogg Company Leakdown plunger
US7028654B2 (en) 2002-10-18 2006-04-18 The Maclean-Fogg Company Metering socket
US7284520B2 (en) 2002-10-18 2007-10-23 Maclean-Fogg Company Valve lifter body and method of manufacture
US7128034B2 (en) 2002-10-18 2006-10-31 Maclean-Fogg Company Valve lifter body
US7191745B2 (en) 2002-10-18 2007-03-20 Maclean-Fogg Company Valve operating assembly
US7281329B2 (en) 2002-10-18 2007-10-16 Maclean-Fogg Company Method for fabricating a roller follower assembly
WO2005005787A1 (de) * 2003-07-09 2005-01-20 Ina-Schaeffler Kg Verfahren zur herstellung eines aussenhebels eines schaltbaren schlepphebels
US20070067989A1 (en) * 2003-07-09 2007-03-29 Bodo Rorig Method of making an outer lever of a switchable finger lever
US7797830B2 (en) 2003-07-09 2010-09-21 Schaeffler Kg Method of making an outer lever of a switchable finger lever
WO2006063673A1 (de) * 2004-12-14 2006-06-22 Daimlerchrysler Ag Nockenfolger zur betätigung eines gaswechselventiles einer brennkraftmaschine
US20080000440A1 (en) * 2004-12-14 2008-01-03 Christophe Reckzugel Support arrangement for cam follower for actuating a gas exchange valve of an internal combustion engine
CN102235191A (zh) * 2010-05-06 2011-11-09 谢夫勒科技有限两合公司 气门摇臂
CN102235191B (zh) * 2010-05-06 2015-01-07 谢夫勒科技股份两合公司 气门摇臂
CN104481622A (zh) * 2014-11-20 2015-04-01 绵阳富临精工机械股份有限公司 一种无滚子气门摇臂及其加工方法

Also Published As

Publication number Publication date
CA993747A (en) 1976-07-27
DE2419219A1 (de) 1974-12-05
JPS5619451B2 (enExample) 1981-05-07
JPS5014943A (enExample) 1975-02-17
BR7403664D0 (pt) 1975-01-07
GB1437285A (en) 1976-05-26

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