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US20050087162A1 - Method of forming a cam-engaged rocker arm - Google Patents

Method of forming a cam-engaged rocker arm Download PDF

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Publication number
US20050087162A1
US20050087162A1 US10/927,372 US92737204A US2005087162A1 US 20050087162 A1 US20050087162 A1 US 20050087162A1 US 92737204 A US92737204 A US 92737204A US 2005087162 A1 US2005087162 A1 US 2005087162A1
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US
United States
Prior art keywords
blank
metal
guide
thickness
cavity
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
US10/927,372
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English (en)
Inventor
Scott Smith
Daniel Mills
Aric Jennings
Stanley Pryba
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.)
GEN TEK TECHNOLOGIES MARKETING Inc
Original Assignee
GEN TEK TECHNOLOGIES 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 GEN TEK TECHNOLOGIES MARKETING Inc filed Critical GEN TEK TECHNOLOGIES MARKETING Inc
Priority to US10/927,372 priority Critical patent/US20050087162A1/en
Assigned to GEN TEK TECHNOLOGIES MARKETING, INC. reassignment GEN TEK TECHNOLOGIES MARKETING, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PRYBA, STANLEY J., JENNINGS, ARIC, MILLS, DAN, SMITH, SCOTT P.
Assigned to BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AGENT reassignment BANK OF AMERICA, N.A., AS FIRST LIEN COLLATERAL AGENT SECURITY AGREEMENT Assignors: TOLEDO TECHNOLOGIES INC.
Assigned to GOLDMAN SACHS CREDIT PARTNERS L.P., AS SECOND LIEN COLLATERAL AGENT reassignment GOLDMAN SACHS CREDIT PARTNERS L.P., AS SECOND LIEN COLLATERAL AGENT SECURITY AGREEMENT Assignors: TOLEDO TECHNOLOGIES INC.
Publication of US20050087162A1 publication Critical patent/US20050087162A1/en
Priority to US11/306,435 priority patent/US20070271985A1/en
Assigned to TOLEDO TECHNOLOGIES, INC. reassignment TOLEDO TECHNOLOGIES, INC. RELEASE OF SECURITY INTEREST AT REEL/FRAME NO. 15747/0644 Assignors: GOLDMAN SACHS CREDIT PARTNERS L.P.
Assigned to TOLEDO TECHNOLOGIES INC. reassignment TOLEDO TECHNOLOGIES INC. TERMINATION OF SECURITY INTEREST IN PATENTS RECORDED AT REEL 015740/FRAME 0519 Assignors: BANK OF AMERICA, NATIONAL ASSOCIATION, AS FIRST LIEN COLLATERAL AGENT
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/20—Making machine elements valve parts
    • B21K1/205—Making machine elements valve parts rocker arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • 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
    • F01L1/12—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
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials
    • 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

Definitions

  • the present invention relates to a method of forming a rocker arm including a valve guide.
  • the invention relates to using a stamping die having a pair of cavities to form the valve guides of the rocker arm.
  • an overhead cam engine typically utilizes a plurality of cam engaged rocker arms to open valves. These rocker arms pivot at one end, contact the valve at an opposite end, and support a roller between the two ends. The roller engages the cam and the cam rotates to move the roller, thereby causing the rocker arm to pivot at a pivot end, and push the valve.
  • Rocker arms can be manufactured by casting metals, blanking and forming, ceramic molding, and other methods. Stamping a metal blank to form a cam-engaged rocker arm including a valve stem guide is common in the art.
  • the valve stem guides of the rocker arms are typically formed using a punch and cavity, folding or coining process. During the coining process, an upper die and a lower die punch an area of the metal blank to plastically deform the metal blank. Generally, the area of the metal blank being coined has a thickness greater than the remaining metal blank, thereby providing additional material to use in forming the valve guides.
  • FIG. 1 illustrates a typical metal blank 8 used in the manufacture of a cam-engaged rocker arm.
  • the metal blank 8 illustrated is of uniform thickness and is folded by turning up two opposing edges, and valve guides are formed by plastically deforming material to the desired locations. This plastic deformation typically moves material from nearby areas of the blank to build up a valve guide. In this forming operation, the thickness of the blank area that lost material may be below a desired minimum thickness. A desired minimum thickness for a rocker arm must be maintained for purposes of strength and durability after a surface hardening treatment even if some of the material of the blank is used to form valve guides.
  • a method and system for forming a cam-engaged rocker includes a stamping process where metal is forced into die cavities to build up material in a desired area of a blank to create an intermediate article.
  • the intermediate article is further formed by a shaving process where the built-up material and additional material is formed into a pair of valve guides for the rocker arm.
  • FIG. 1 is a top view of a prior art metal blank used for forming a cam-engaged rocker arm.
  • FIG. 2 is a perspective view of a cam engaged rocker arm formed in accordance with an embodiment of the present invention.
  • FIG. 3 is a sectional side view of the rocker arm of FIG. 1 .
  • FIG. 4 is a top view of a metal blank before forming a cam-engaged rocker arm according to an embodiment of the present invention.
  • FIG. 5 is a top view of an intermediate article after undergoing a first stamping process according to an embodiment of the present invention.
  • FIG. 6 is a perspective view of a further intermediate article according to an embodiment of the present invention, after undergoing a further stamping operation to form side walls.
  • FIG. 7 is a front view of the further intermediate article of FIG. 6 illustrating the die used for pinch forming valve guides according to an embodiment of the present invention.
  • FIG. 8 is a front view similar to FIG. 7 , but illustrating the die after pinch forming the valve guides.
  • FIG. 9 is a top view of an alternate embodiment of the metal blank of FIG. 4 .
  • a rocker arm 10 is illustrated to include a metal body 12 , a valve end 14 , a pivot end 16 , sidewalls 18 , a central portion 20 located between the valve end 14 and the pivot end 16 , and a bridge, or cross member, 22 extending between sidewalls 18 .
  • Metal body 12 is defined by an upper surface 24 , a lower surface 26 , and an outer peripheral surface 28 .
  • central portion 20 has a central aperture 30 and roller apertures 32 formed therein. Central aperture 30 is defined by an inner surface 34 . Roller apertures 32 are defined by roller aperture surfaces 36 .
  • Valve end 14 includes valve guides 40 extending from lower surface 26 .
  • Each valve guide 40 is defined, at least in part, by an inboard surface 42 , an outboard surface 44 , and a distal surface 46 .
  • a pair of shaved areas, S, are illustrated on lower surface 26 , intersecting outboard surfaces 44 .
  • Valve guides 40 are illustrated to have a height H, measured perpendicular to lower surface 26 , between distal surface 46 and lower surface 26 .
  • inboard surfaces 42 are separated by a distance D.
  • the pivot end 16 includes a cup 50 formed therein and adapted to rotate on a pivot (not shown).
  • metal blank 110 has a valve end 114 , a pivot end 116 , and a central portion 120 located between the valve end 114 and the pivot end 116 .
  • the metal blank 110 has an upper surface 124 , a lower surface 126 , and an outer surface 128 .
  • Upper surface 124 and lower surface 126 are preferably identical in outline.
  • the metal blank 110 has a substantially uniform cross-sectional thickness T as measured between the upper surface 124 and the lower surface 126 .
  • the metal blank 110 includes an additional material volume, forming ears 140 , about the valve end 114 .
  • the ears 140 include the volume circumscribed by a Line L, the outer surface 128 , upper surface 124 , and lower surface 126 , adjacent valve end 114 , and define an outboard portion 160 of the metal blank 110 .
  • Metal blank 110 is segmented into zones A, B, C, D, E, F, and G, each having a thickness T, as discussed below.
  • FIG. 5 illustrates an intermediate article 210 .
  • metal intermediate article 210 has a valve end 214 , a pivot end 216 , and a central portion 220 located between the valve end 214 and the pivot end 216 .
  • the intermediate article 210 has an upper surface 224 , a lower surface 226 , and an outer surface 228 .
  • the intermediate article 210 has a substantially uniform cross-sectional thickness T as measured between the upper surface 224 and the lower surface 226 .
  • Intermediate article 210 is shown to include projections 240 defined, at least in part, by an inboard surface 242 , an outboard surface 244 , and a distal surface 246 . As illustrated, inboard surfaces 242 are separated by a distance W.
  • Zones A, B, C, D, E, and H each have a thickness T substantially equal to the thickness of metal blank 110 .
  • Zone I differs from Zone G in that Zone I has projections 240 and Zone G has ears 140 .
  • Peripheral surface 228 viewed along the Z-axis, closely approximates the outline of the metal blank 110 without ears 140 , as defined by peripheral surface 128 and Lines L.
  • the metal blank 110 of FIG. 4 can be formed into the intermediate article 210 of FIG. 5 , as described below.
  • Zones A, B, C, D, and E of metal blank 110 and intermediate article 210 are substantially identical.
  • Zone G contains ears 140 that are plastically deformed, by a Force P and resulting Force P′ ( FIG. 4 ), inward toward each other to produce a resulting Zone I.
  • Zones F and H are preferably identical, although Zone H may be slightly distorted with respect to Zone F as a result of the forming operation described herein.
  • a further formed intermediate article 310 in the manufacture of rocker arm 10 is illustrated to include a valve end 314 , a pivot end 316 , and a central portion 320 located between the valve end 314 and the pivot end 316 .
  • the further formed intermediate article 310 has an upper surface 324 , a lower surface 326 , and an outer surface 328 .
  • the further formed intermediate article 310 has a substantially uniform cross-sectional thickness T as measured between the upper surface 324 and the lower surface 326 .
  • thickness T does not vary between rocker arm 10 , metal blank 110 , intermediate article 210 , and further formed intermediate article 310 .
  • Further formed intermediate article 310 is shown to include sidewalls 318 , a cross member 322 , and projections 340 defined, at least in part, by an inboard surface 342 , an outboard surface 344 , and a distal surface 346 .
  • inboard surfaces 342 are separated by a Distance X.
  • Distance X is substantially equal to Distance W, although a slight variation between these distances caused by the forming operations described herein may be experienced.
  • sidewalls 318 are about identical in outline to sidewalls 18 .
  • stamping die 400 for forming valve guides 40 is illustrated to include a center post 402 , a pair of cams 404 having a shaving edge 410 .
  • Center post 402 is illustrated to include a valve guide forming surface 414 .
  • Shaving edge 410 is preferably curved to match the curve of the intersecting line between valve guide 40 and lower surface 26 , as best seen in FIG. 3 .
  • stamping die 400 has a further formed intermediate article 310 positioned therein and prepared for a shaving operation to create valve guides 40 .
  • stamping die 400 has one rocker arm 10 positioned therein after the shaving operation has formed valve guides 40 .
  • the metal blank 110 undergoes a first stamping process in which a stamping die (not shown), having a pair of cavities (not shown) which are used to form the projections 240 of intermediate article 210 .
  • the cavities of the stamping die are centrally located about the valve end 14 of the metal blank 110 .
  • the metal blank 110 is stamped such that during the stamping process, the ears 140 from the outboard portion 160 of the metal blank 110 are forced inward toward the cavities of the stamping die, thereby displacing material adjacent lower surface 126 into the cavities to form projections 240 ( FIG. 5 ).
  • Projections 240 are formed by drawing the ears 140 from the outboard portion 160 while minimizing any change to the cross-sectional thickness of the intermediate article 210 that does not include projections 240 .
  • the ears 140 are driven inward, plastically deforming material of metal blank 110 into the pair of cavities of the stamping die, producing projections 240 .
  • each ear 140 produces a projection 240 during this forming operation.
  • intermediate article 210 has an identical outline defined by outer surface 228 as outer surface 128 of metal blank 110 with the exclusion of the ears 140 .
  • the material volume of ears 140 is about equal to the material volume of the projections 240 .
  • FIG. 5 best illustrates the intermediate article 210 after the first stamping process has been completed.
  • a further processing step of the method presented herein involves the forming of sidewalls 18 .
  • the intermediate article 210 of FIG. 5 is formed into the further formed intermediate article 310 of FIG. 6 by a folding operation.
  • This folding operation forms sidewalls 318 by folding the sides of further formed intermediate article 310 about 90° toward upper surface 324 along the length of further formed intermediate article 310 from valve end 314 to pivot end 316 .
  • the further formed intermediate article 310 of FIG. 6 undergoes a shaving process to form valve guides 40 .
  • the shaving process is performed by pinching material between upper surface 324 and lower surface 326 between the cams 404 and shaving the material toward the center post 402 .
  • the material is plastically deformed toward projections 340 , plastically deforming the material of projections 340 , until both volumes of material are formed into each valve guide 40 .
  • This shaving process creates a shaved area S ( FIGS. 2 and 8 ), that is defined by the material of lower surface 26 that was exposed by the shaving process. As best seen in FIG.
  • distance X, between projections 340 of further formed intermediate article 310 is greater than the width of center post 402 adjacent lower surface 326 .
  • further formed intermediate article 310 can be positioned within die 400 without having to force further formed intermediate article 310 into position.
  • inboard surfaces 342 may be angled such that their orientation toward lower surface 326 is less than 90°, and the distance between distal surfaces 346 is greater than the minimum distance between projections 340 , thereby eliminating any difficulty of interfering surfaces when positioning further formed intermediate article within die 400 .
  • the shaving process results in a minimum of approximately 65% of stock thickness being maintained across the shaved area A so as not to create a through harden heat treat condition in the shaved area.
  • the stock thickness is the original thickness of metal blank 110 as measured from upper surface 24 to lower surface 26 . This stock thickness is preferably about 3 mm (0.12 inch) to about 3.94 mm (0.16 inch). It is desired to maintain a minimum thickness of the resulting rocker arm in the shaved area A, as measured between the shaved area A and the upper surface 24 .
  • the minimum required thickness for rocker arm 10 adjacent shaved area A is determined by the depth of hardening experienced by rocker arm 10 in a post-forming hardening treatment and the desired soft core thickness. A rocker arm with a hardened surface and soft core is typically desired for purposes of durability and wear resistance. In the embodiment shown, the post forming hardening treatment will harden the rocker arm 10 to a maximum depth of about 0.020 inches measured from all surfaces.
  • FIG. 9 illustrates a metal blank 510 as an alternate embodiment of the metal blank 110 .
  • metal blank 510 has a valve end 514 , a pivot end 516 , and a central portion 520 located between the valve end 514 and the pivot end 516 .
  • the metal blank 510 has an upper surface 524 , a lower surface 526 , and an outer surface 528 .
  • Upper surface 524 and lower surface 526 are preferably identical in outline.
  • the metal blank 510 has a substantially uniform cross-sectional thickness T as measured between the upper surface 524 and the lower surface 526 .
  • the metal blank 510 includes an additional material volume, forming ears 540 , about the valve end 514 .
  • the ears 540 include the volume circumscribed by a Line M, the outer surface 528 , upper surface 524 , and lower surface 526 , adjacent valve end 514 , and define an outboard portion 560 of the metal blank 510 .
  • Metal blank 510 is segmented into zones A, B, C, D, E, J, and K, each having a thickness T.
  • Metal blank 510 is formed into intermediate article 210 by forcing ears 540 into the valve end 514 as metal plastically flows into the cavities forming projections 240 , as discussed herein.
  • each ear 540 produces a projection 240 on Zone K at valve end 514 during this forming operation.
  • Cup 50 and central aperture 30 may be formed in lower surface 26 at any appropriate time when processing metal blank 110 into the rocker arm 10 .
  • central aperture 30 is formed and cup 50 is formed as the last forming step, after pinch forming of valve guides 40 .
  • Roller apertures 32 may be formed either by machining or in-die piercing.
  • roller apertures 32 are formed after pinch forming valve guides 40 .
  • Outer curved, or peripheral, surfaces 28 , 128 , 228 , or 528 may be completely curved, have straight portions, or include straight portions intersecting at predetermined angles.
  • valve guides are illustrated, another form of the guides may also be useful at the pivot end.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Forging (AREA)
US10/927,372 2003-08-27 2004-08-26 Method of forming a cam-engaged rocker arm Abandoned US20050087162A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/927,372 US20050087162A1 (en) 2003-08-27 2004-08-26 Method of forming a cam-engaged rocker arm
US11/306,435 US20070271985A1 (en) 2004-08-26 2005-12-28 Method for Forming a Cam-Engaged Rocker Arm

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49807603P 2003-08-27 2003-08-27
US10/927,372 US20050087162A1 (en) 2003-08-27 2004-08-26 Method of forming a cam-engaged rocker arm

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/306,435 Continuation-In-Part US20070271985A1 (en) 2004-08-26 2005-12-28 Method for Forming a Cam-Engaged Rocker Arm

Publications (1)

Publication Number Publication Date
US20050087162A1 true US20050087162A1 (en) 2005-04-28

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ID=34272635

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/927,372 Abandoned US20050087162A1 (en) 2003-08-27 2004-08-26 Method of forming a cam-engaged rocker arm

Country Status (6)

Country Link
US (1) US20050087162A1 (fr)
EP (1) EP1660258B1 (fr)
JP (1) JP2007503317A (fr)
AT (1) ATE373535T1 (fr)
DE (1) DE602004009087T2 (fr)
WO (1) WO2005021183A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090144977A1 (en) * 2005-08-22 2009-06-11 Nakanishi Metal Works Co., Ltd. Method for manufacturing rocker arm
US20170350281A1 (en) * 2014-12-26 2017-12-07 Otics Corporation Rocker arm and method of manufacturing the rocker arm
CN112518260A (zh) * 2020-12-28 2021-03-19 湖南易通星桥汽车零部件有限公司 一种单片导向臂的生产流程

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US7124957B2 (en) 2004-11-24 2006-10-24 Optoelectronics Co., Ltd. Apparatus for reading a color symbol
JP4539381B2 (ja) * 2005-03-10 2010-09-08 日本精工株式会社 板金製ロッカーアームの製造方法
JP4685548B2 (ja) 2005-08-22 2011-05-18 中西金属工業株式会社 ロッカーアームの製造方法
JP2007205288A (ja) 2006-02-02 2007-08-16 Otics Corp ロッカアームとその製造方法
DE102006052821A1 (de) * 2006-11-09 2008-05-15 Schaeffler Kg Schlepphebel zur Betätigung eines Gaswechselventils einer Brennkraftmaschine
JP4858592B2 (ja) * 2009-10-15 2012-01-18 日本精工株式会社 板金製ロッカーアームの製造方法
CN107971708B (zh) * 2017-12-04 2019-09-13 富奥辽宁汽车弹簧有限公司 一种导向臂的生产方法

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US5419217A (en) * 1990-11-19 1995-05-30 Nippon Piston Ring Co., Ltd. Machine element with at least a fitting member pressure-fitted on a shaft and method of making the same
US5604044A (en) * 1992-12-28 1997-02-18 Mccabe; Charles J. Blanks for sheet material forming process
US6425361B1 (en) * 1999-05-31 2002-07-30 Koyo Seiko Co., Ltd. Rocker arm and method of fabricating rocker arm body
US6615635B2 (en) * 2000-06-20 2003-09-09 Ina Walzlager Schaeffler Ohg Method of making a lever-type cam follower, and lever-type cam follower
US20040000278A1 (en) * 2002-06-26 2004-01-01 Nobutsuna Motohashi Rocker arm and manufacturing method thereof
US20040000277A1 (en) * 2002-06-26 2004-01-01 Koyo Seiko Co., Ltd. Manufacturing method of rocker arm
US6729285B2 (en) * 2002-04-22 2004-05-04 Ina-Schaeffler Kg Lever-type cam follower made of sheet metal

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JP3497374B2 (ja) * 1998-03-25 2004-02-16 中西金属工業株式会社 ロッカーアーム及びその製造方法
EP1122408B1 (fr) * 1999-08-18 2009-03-04 JTEKT Corporation Culbuteur et procede de fabrication d'un corps de culbuteur
JP3785294B2 (ja) * 1999-11-02 2006-06-14 中西金属工業株式会社 ロッカーアーム及びその製造方法
DE10030341C2 (de) * 2000-06-20 2003-04-10 Ina Schaeffler Kg Verfahren zur Herstellung eines hebelartigen Nockenfolgers

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
US5419217A (en) * 1990-11-19 1995-05-30 Nippon Piston Ring Co., Ltd. Machine element with at least a fitting member pressure-fitted on a shaft and method of making the same
US5604044A (en) * 1992-12-28 1997-02-18 Mccabe; Charles J. Blanks for sheet material forming process
US6425361B1 (en) * 1999-05-31 2002-07-30 Koyo Seiko Co., Ltd. Rocker arm and method of fabricating rocker arm body
US6615635B2 (en) * 2000-06-20 2003-09-09 Ina Walzlager Schaeffler Ohg Method of making a lever-type cam follower, and lever-type cam follower
US6729285B2 (en) * 2002-04-22 2004-05-04 Ina-Schaeffler Kg Lever-type cam follower made of sheet metal
US20040000278A1 (en) * 2002-06-26 2004-01-01 Nobutsuna Motohashi Rocker arm and manufacturing method thereof
US20040000277A1 (en) * 2002-06-26 2004-01-01 Koyo Seiko Co., Ltd. Manufacturing method of rocker arm

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090144977A1 (en) * 2005-08-22 2009-06-11 Nakanishi Metal Works Co., Ltd. Method for manufacturing rocker arm
US7788805B2 (en) * 2005-08-22 2010-09-07 Nakanishi Metal Works Co., Ltd. Method for manufacturing rocker arm
US20170350281A1 (en) * 2014-12-26 2017-12-07 Otics Corporation Rocker arm and method of manufacturing the rocker arm
US10309263B2 (en) * 2014-12-26 2019-06-04 Otics Corporation Rocker arm and method of manufacturing the rocker arm
CN112518260A (zh) * 2020-12-28 2021-03-19 湖南易通星桥汽车零部件有限公司 一种单片导向臂的生产流程

Also Published As

Publication number Publication date
ATE373535T1 (de) 2007-10-15
EP1660258B1 (fr) 2007-09-19
JP2007503317A (ja) 2007-02-22
WO2005021183A1 (fr) 2005-03-10
DE602004009087T2 (de) 2008-06-12
EP1660258A1 (fr) 2006-05-31
DE602004009087D1 (de) 2007-10-31

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