US20080229578A1 - Rocker arm with integral internal oil passages - Google Patents

Rocker arm with integral internal oil passages Download PDF

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Publication number
US20080229578A1
US20080229578A1 US11/688,347 US68834707A US2008229578A1 US 20080229578 A1 US20080229578 A1 US 20080229578A1 US 68834707 A US68834707 A US 68834707A US 2008229578 A1 US2008229578 A1 US 2008229578A1
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US
United States
Prior art keywords
rocker arm
sections
oil passages
complimentary
halves
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.)
Abandoned
Application number
US11/688,347
Inventor
Thomas C. Edelmayer
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.)
GENTEK TECHNOLOGIES MARKETING Inc
GenTek Tech Marketing Inc
Original Assignee
GenTek Tech Marketing Inc
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 GenTek Tech Marketing Inc filed Critical GenTek Tech Marketing Inc
Priority to US11/688,347 priority Critical patent/US20080229578A1/en
Assigned to GENTEK TECHNOLOGIES MARKETING INC. reassignment GENTEK TECHNOLOGIES MARKETING INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EDELMAYER, THOMAS C.
Priority to CNA2008800003943A priority patent/CN101541448A/en
Priority to KR1020087016654A priority patent/KR20090126174A/en
Priority to JP2009554696A priority patent/JP2010522301A/en
Priority to PCT/US2008/057417 priority patent/WO2008115946A2/en
Publication of US20080229578A1 publication Critical patent/US20080229578A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
    • 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
    • F01L1/181—Centre pivot rocking arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • 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
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2411—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the valve stem and rocker arm
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • 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
    • F01L2305/00—Valve arrangements comprising rollers
    • F01L2305/02—Mounting of rollers
    • 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
    • F01M9/107—Lubrication of valve gear or auxiliaries of rocker shaft bearings
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49295—Push rod or rocker arm making

Definitions

  • the present invention relates to a rocker arm and method for making a rocker arm for an internal combustion engine having internal oil passages. More particularly, the invention relates to an improved rocker arm having internal oil passages formed by joining pre-fabricated sections that have oil passages as an integral feature of at least one of the sections.
  • the novel rocker arm of the invention is characterized by joining the pre-fabricated sections of sintered metal particles, generally two halves that are symmetrical to a central plane and wherein the mating surfaces of one or both halves incorporate grooves which upon assembly form one or more passageways for oil.
  • the resulting product results in a significant reduction in mass and is found to produce an increase in structural stiffness.
  • the pre-fabricated sections preferably of powdered metal composition, are joined together by any convenient known technique such as by metallurgical brazing or by chemical or mechanical means.
  • FIG. 1 is a perspective view of the rocker arm assembly formed by joining two separated preformed parts as contemplated by the invention mounted on a rocker shaft (not shown) and an hydraulic lash adjuster cartridge installed therein.
  • FIG. 2 is a perspective view of two pre-fabricated mirror-image sections of the rocker arm of the invention.
  • FIG. 3 is a perspective view of the assembled sections show in FIG. 2 .
  • the rocker arm of the invention comprising the pre-fabrication of separate mating sections, preferably two sections, is manufactured conveniently such as by furnace brazing together the sections, preferably formed of a powdered metal and containing integrally formed grooves in one or both mating sections. Additional machining or drilling to form internal passageways is avoided.
  • the metal is atomized by methods in which a stream of molten metal is struck with air or water jets and the formed metal particles are collected, sieved and annealed.
  • the powdered metal particles including mixtures of different metals, are shaped into the desired suitable form such as by flowing the metal powder usually at room temperature into a die cavity shaped as the finished part, and then applying pressure from above and below to form a compact. After ejection from the die, the compact is heated (sintered) to form a coherent mass with the configuration of the original die and properties related to the metals used.
  • the pressure applied affects the density as well as the strength of the formed piece; the greater pressure the higher the strength.
  • a low density porous compact may be formed by pouring the powder into a die and then heating it without first applying pressure.
  • the shape and size of the die cavity can be exactly as required by the finished part.
  • this invention contemplates the use of any suitable metal or metal alloy powder and preferable powders of iron or iron alloys.
  • FIG. 1 illustrates an essentially completely assembled rocker arm 20 comprising the rocker arm body 22 , a hydraulic lash adjustment cartridge 24 , roller bearing 26 , and roller bearing axle 28 .
  • FIG. 2 there is illustrated two sintered metal pre-fabricated sections 30 and 32 which when sintered together form the rocker arm body 22 .
  • Rocker arm section 32 incorporates lubricant pathway grooves 34 and 36 which when the two sections 30 and 32 are combined, i.e. covered by surfaces 44 and 46 during assembly, form oil passages which communicate lubricating oil provided by the rocker shaft (not shown) installed in openings 38 .
  • the pre-formed lubricant pathways 34 and 36 may follow any desired path.
  • the circuitous path of the groove 34 is facilitated by means of the two rocker arm sections which further permits openings 48 , 50 , and 52 which reduce mass and rotational inertia and permits structural beam element 42 which increases the stiffness of the rocker arm body shown in FIG. 3 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Powder Metallurgy (AREA)

Abstract

A rocker arm and method for manufacture is provided whereby the rocker arm is manufactured in two halves generally symmetric to a central plane. The mating surface of one or both rocker arm halves incorporate grooves which upon assembly provide passageways which may follow any desired pathway for lubricant and or afford a reduction in mass and/or an increase in structural stiffness. The two halves are preferably joined together by metallurgical brazing or by other chemical or mechanical means.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a rocker arm and method for making a rocker arm for an internal combustion engine having internal oil passages. More particularly, the invention relates to an improved rocker arm having internal oil passages formed by joining pre-fabricated sections that have oil passages as an integral feature of at least one of the sections.
    • BACKGROUND OF THE INVENTION
  • Conventional methods for manufacturing rocker arms generally involve stamping or casting procedures. The formed pieces are thereafter processed to remove material by machining e.g. drilling, milling, etc. to form oil passages in the rocker arm. Such methods by machining, drillings, milling, etc. require the removal of material to create the necessary oil passages. Additionally, passages formed in that manner are often less precise in dimensions and location. Also, prior art drilling or machining of oil passages, as a practical matter, must comprise a straight line and be of a size compatible with the drilling process and cannot take the form of a “worm” groove formed so as to provide the optimum advantage. Additionally, deeper holes, e.g. those in excess of about 10 drill-diameters deep, require the use of slower, relatively costly drilling process i.e., gun drilling. A method for production which pre-fabricates sections and the resulting product with precisely formed and located oil passages and joins such sections to form a finished rocker arm would be advantageous in cost and time savings.
    • SUMMARY OF THE INVENTION
  • The novel rocker arm of the invention is characterized by joining the pre-fabricated sections of sintered metal particles, generally two halves that are symmetrical to a central plane and wherein the mating surfaces of one or both halves incorporate grooves which upon assembly form one or more passageways for oil. The resulting product results in a significant reduction in mass and is found to produce an increase in structural stiffness. The pre-fabricated sections, preferably of powdered metal composition, are joined together by any convenient known technique such as by metallurgical brazing or by chemical or mechanical means.
    • BRIEF DESCRIPTION OF THE FIGURES
  • FIG. 1 is a perspective view of the rocker arm assembly formed by joining two separated preformed parts as contemplated by the invention mounted on a rocker shaft (not shown) and an hydraulic lash adjuster cartridge installed therein.
  • FIG. 2 is a perspective view of two pre-fabricated mirror-image sections of the rocker arm of the invention.
  • FIG. 3 is a perspective view of the assembled sections show in FIG. 2.
    •  DETAILED DESCRIPTION OF THE INVENTION
  • The rocker arm of the invention comprising the pre-fabrication of separate mating sections, preferably two sections, is manufactured conveniently such as by furnace brazing together the sections, preferably formed of a powdered metal and containing integrally formed grooves in one or both mating sections. Additional machining or drilling to form internal passageways is avoided.
  • The metal is atomized by methods in which a stream of molten metal is struck with air or water jets and the formed metal particles are collected, sieved and annealed. In processing, the powdered metal particles, including mixtures of different metals, are shaped into the desired suitable form such as by flowing the metal powder usually at room temperature into a die cavity shaped as the finished part, and then applying pressure from above and below to form a compact. After ejection from the die, the compact is heated (sintered) to form a coherent mass with the configuration of the original die and properties related to the metals used. The pressure applied affects the density as well as the strength of the formed piece; the greater pressure the higher the strength. A low density porous compact may be formed by pouring the powder into a die and then heating it without first applying pressure. The shape and size of the die cavity can be exactly as required by the finished part. However, if desired, this invention contemplates the use of any suitable metal or metal alloy powder and preferable powders of iron or iron alloys.
  • Referring to the drawings, FIG. 1 illustrates an essentially completely assembled rocker arm 20 comprising the rocker arm body 22, a hydraulic lash adjustment cartridge 24, roller bearing 26, and roller bearing axle 28.
  • Referring to FIG. 2 there is illustrated two sintered metal pre-fabricated sections 30 and 32 which when sintered together form the rocker arm body 22. Rocker arm section 32 incorporates lubricant pathway grooves 34 and 36 which when the two sections 30 and 32 are combined, i.e. covered by surfaces 44 and 46 during assembly, form oil passages which communicate lubricating oil provided by the rocker shaft (not shown) installed in openings 38. The pre-formed lubricant pathways 34 and 36 may follow any desired path. The circuitous path of the groove 34 is facilitated by means of the two rocker arm sections which further permits openings 48, 50, and 52 which reduce mass and rotational inertia and permits structural beam element 42 which increases the stiffness of the rocker arm body shown in FIG. 3.
  • Although the invention has been described with respect to a preferred specific embodiment, many variations and modifications will become apparent to those skilled in the art. It is therefore the intention that the claims be interpreted as broadly as possible in view of the prior art to include all such variations and modifications.

Claims (10)

1. A method of making a sintered metal rocker arm from complimentary pre-fabricated mating sections of metal powder wherein at least one of said sections contains an integral formed lubricant passageway, and bonding said section to form the rocker arm product containing therein the integrally formed internal passageway.
2. The method of claim 1 wherein the rocker arm is made by joining two complimentary half-sections.
3. The method of claim 2 wherein the lubricant passageway is contained entirely within one or more of the pre-fabricated sections.
4. The method of claim 2 wherein the lubricant passageway is formed when the complimentary sections are mated and bonded together.
5. The method of claim 1 wherein the two complimentary half-sections are comprised of a powdered metal alloy.
6. The method of claim 1 wherein the section are comprised of powdered metal selected from iron and iron alloys.
7. The method of claim 1 wherein the sections are bonded by metallurgical brazing.
8. The rocker arm produced by the method of claim 1.
9. The rocker arm produced by the method of claim 4.
10. The rocker arm produced by the method of claim 6.
US11/688,347 2007-03-20 2007-03-20 Rocker arm with integral internal oil passages Abandoned US20080229578A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US11/688,347 US20080229578A1 (en) 2007-03-20 2007-03-20 Rocker arm with integral internal oil passages
CNA2008800003943A CN101541448A (en) 2007-03-20 2008-03-19 Roller arm with integral internal oil passages
KR1020087016654A KR20090126174A (en) 2007-03-20 2008-03-19 Roller arm with integral internal oil passage
JP2009554696A JP2010522301A (en) 2007-03-20 2008-03-19 Rocker arm with integral internal oil path
PCT/US2008/057417 WO2008115946A2 (en) 2007-03-20 2008-03-19 Roller arm with integral internal oil passages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/688,347 US20080229578A1 (en) 2007-03-20 2007-03-20 Rocker arm with integral internal oil passages

Publications (1)

Publication Number Publication Date
US20080229578A1 true US20080229578A1 (en) 2008-09-25

Family

ID=39766737

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/688,347 Abandoned US20080229578A1 (en) 2007-03-20 2007-03-20 Rocker arm with integral internal oil passages

Country Status (5)

Country Link
US (1) US20080229578A1 (en)
JP (1) JP2010522301A (en)
KR (1) KR20090126174A (en)
CN (1) CN101541448A (en)
WO (1) WO2008115946A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190093523A1 (en) * 2016-10-20 2019-03-28 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Rocker arm

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132196A (en) * 1975-10-02 1979-01-02 Toledo Stamping & Manufacturing Company Rocker arm
US4624223A (en) * 1980-03-27 1986-11-25 Toledo Stamping & Manufacturing Company Rocker arm and method of making same
US5463809A (en) * 1993-02-16 1995-11-07 Ryobi Outdoor Products Method of making a powdered metal camshaft assembly
US6502480B1 (en) * 1998-11-16 2003-01-07 Bruce K. Walker High performance forged aluminum connecting rod and method of making the same
US7185618B1 (en) * 2006-01-12 2007-03-06 Gentek Technologies Marketing Inc. Sheet metal rocker arm with integrally formed cross member

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60218459A (en) * 1984-04-13 1985-11-01 Mitsubishi Steel Mfg Co Ltd Ferrous alloy powder having excellent compressibility and sinterability for wear-resistant sintered parts
JPH03274205A (en) * 1990-03-26 1991-12-05 Isuzu Motors Ltd Locally hardened sintered body and manufacture thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132196A (en) * 1975-10-02 1979-01-02 Toledo Stamping & Manufacturing Company Rocker arm
US4624223A (en) * 1980-03-27 1986-11-25 Toledo Stamping & Manufacturing Company Rocker arm and method of making same
US5463809A (en) * 1993-02-16 1995-11-07 Ryobi Outdoor Products Method of making a powdered metal camshaft assembly
US6502480B1 (en) * 1998-11-16 2003-01-07 Bruce K. Walker High performance forged aluminum connecting rod and method of making the same
US7185618B1 (en) * 2006-01-12 2007-03-06 Gentek Technologies Marketing Inc. Sheet metal rocker arm with integrally formed cross member

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190093523A1 (en) * 2016-10-20 2019-03-28 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Rocker arm
US11131219B2 (en) * 2016-10-20 2021-09-28 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Rocker arm

Also Published As

Publication number Publication date
WO2008115946A4 (en) 2009-02-19
WO2008115946A3 (en) 2008-11-06
KR20090126174A (en) 2009-12-08
WO2008115946A2 (en) 2008-09-25
JP2010522301A (en) 2010-07-01
WO2008115946A8 (en) 2008-12-18
CN101541448A (en) 2009-09-23

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Legal Events

Date Code Title Description
AS Assignment

Owner name: GENTEK TECHNOLOGIES MARKETING INC., MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:EDELMAYER, THOMAS C.;REEL/FRAME:019074/0272

Effective date: 20070321

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION