US20070175028A1 - Method for producing exterior component of assembled camshaft - Google Patents

Method for producing exterior component of assembled camshaft Download PDF

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Publication number
US20070175028A1
US20070175028A1 US10/591,323 US59132305A US2007175028A1 US 20070175028 A1 US20070175028 A1 US 20070175028A1 US 59132305 A US59132305 A US 59132305A US 2007175028 A1 US2007175028 A1 US 2007175028A1
Authority
US
United States
Prior art keywords
coupling
cam
exterior
exterior component
producing
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
US10/591,323
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English (en)
Inventor
Kazuaki Okuno
Hirohisa Harada
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Assigned to HONDA MOTOR CO., LTD. reassignment HONDA MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HARADA, HIROHISA, OKUNO, KAZUAKI
Publication of US20070175028A1 publication Critical patent/US20070175028A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • 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
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/02—Camshafts
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0475—Hollow camshafts
    • 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
    • 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
    • Y10T29/49293—Camshaft making
    • 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
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y10T29/49984—Coating and casting

Definitions

  • the invention relates to a method for producing an exterior component of an assembled camshaft used for a reciprocating engine.
  • valve gear mechanism for a reciprocating engine there is employed a type in which a rocker arm, a swing arm, or the like is arranged between a cam and an intake/exhaust valve, as well as a direct drive type in which a cam is placed on a upper part right on an intake/exhaust valve (a tappet) to accommodate higher rotation and higher power of an engine.
  • a single-piece product formed by means of cast forming, forge forming, or cut forming is employed as a camshaft on which cams are formed.
  • the assembled camshaft includes, for instance, a hollow shaft which is made of a steel pipe or the like, and exterior components such as cam pieces, a nosepiece, and so on.
  • the hollow shaft is fixed to the exterior components by means of weld bonding, press-fit fixation, tube expansion fixation, or the like.
  • the exterior components of the assembled camshaft are produced by means of various kinds of production methods.
  • the following methods are publicly known. For instance, as a method for producing a cam piece mainly by means of a machining process, the following methods are proposed.
  • a cutting process and a grinding process are applied to a peripheral surface of a hollow bar material to produce a cam piece material with a predetermined cam profile. Then, the cam piece material is cut at a predetermined width to obtain a cam piece (a round-sliced cam) (Refer to Patent Document 1).
  • a cutting process and a grinding process are applied to a peripheral surface of a solid bar material to produce a cam piece material with a predetermined cam profile.
  • Patent Document 1 JP S52-41404 U (Paragraphs 0015-0022 and FIGS. 1 and 6)
  • Patent Document 2 JP H03-15609 A (Embodiment and FIG. 1)
  • Patent Document 3 JP 2003-285138 A (Paragraphs 0042-0046 and FIG. 1)
  • Patent Document 4 JP H09-256819 A (Paragraphs 0008 and 0009, and FIG. 1)
  • Patent Documents 1 and 2 are methods by which a hollow or solid bar material is machine-processed to form a cam piece. Therefore, there is a problem that an apparatus to form a cam profile (such as an NC copy lathe) and a cutting apparatus which cuts off a cam piece from a cam piece material are required. In addition, there is also a problem that more time and processes are required for production. Moreover, the production methods described in Patent Documents 3 and 4 are methods by which a cam piece is obtained by means of forge forming and cast forming. However, in the methods, the number of cam pieces obtained at a time through a forging process or a casting process cannot be large since cavity layout and so on in a metal mold is limited. Therefore, there is a problem that it is difficult to improve productivity.
  • a method for producing an exterior component of an assembled camshaft including a casting step for casting a coupling of exterior components which has a shaft fit hole, in which plural exterior component original shapes between which vulnerable portions are inserted are coupled, and a dividing step for breaking the coupling of exterior components at one of the vulnerable portions to obtain the exterior component.
  • the production method it is possible to obtain the coupling of exterior components which has a lot of exterior component original shapes and vulnerable portions, through a one-time casting process. Then, the vulnerable portions of the coupling of exterior components are hit and broken with an air hammer or manually. Therefore, it is possible to produce a lot of the exterior components in a short time.
  • a bush which forms cam piece original shapes and notches and a sand core which forms a shaft hole are set in a metal mold. After that, molten metal such as cast steel is poured into the metal mold through a sprue. The thus obtained coupling of exterior components is set to a jig. Then, the notch is hit and broken with a tool which has a sharp tip of a blade so that the exterior component is obtained.
  • the casting step may include a step for chilling the coupling of exterior components.
  • the exterior component becomes harder.
  • a chiller made of copper alloy or the like is employed as a bush so as to quench the molten metal and chill the coupling of exterior components.
  • FIG. 1 is a perspective view showing an assembled camshaft according to an embodiment.
  • FIG. 2 is a cross-sectional view of an essential part of the assembled camshaft according to the embodiment.
  • FIG. 3 is a longitudinal sectional view showing a metal mold.
  • FIG. 4 is a longitudinal sectional view showing an essential part of the metal mold.
  • FIG. 5 is a perspective view showing a part of a chiller.
  • FIG. 6 is an explanatory diagram showing a step for casting a coupling of cam pieces.
  • FIG. 7 is an explanatory diagram showing that heat is removed from the coupling of cam pieces by the chillers.
  • FIG. 8 is a perspective view showing the coupling of cam pieces.
  • FIG. 9 is an explanatory diagram showing a breaking step of the coupling of cam pieces.
  • FIG. 10 is a perspective view of a cam piece.
  • FIG. 11 is an explanatory diagram showing an assembling step of the camshaft.
  • an assembled camshaft is merely referred to as a camshaft.
  • a camshaft 100 shown in FIGS. 1 and 2 is a camshaft which drives an intake valve of a four-cycle DOHC four-cylinder engine.
  • Cam pieces 9 and end pieces 102 are fixed to a hollow shaft 101 in order that the camshaft is produced.
  • the hollow shaft 101 is a machining-processed product made of a cold drawn steel tube (for instance, a machine structure carbon steel tube STKM17C or the like).
  • a peripheral surface of the hollow shaft is finish-grinded with reference to centers of both ends.
  • the cam piece 9 and the end piece 102 are cast products made of cast steel (for instance, low-alloy cast steel SCNCrM2) and are press-fit (or brazed) to the hollow shaft 101 so as to fit and fixed on the hollow shaft 101 .
  • main components of the casting apparatus 1 are a two-piece metal mold 2 and a core driver 3 which inserts a sand core 31 in the metal mold 2 .
  • the metal mold 2 includes an ingate 21 through which molten metal is injected, a sprue 22 which extends downward from the ingate 21 , a runner 23 which horizontally introduces the molten metal from the sprue 22 , a cavity 24 which extends upward from an end of the runner 23 , and an opening 25 which is formed above the top end of the cavity 24 .
  • chiller holders 26 are formed in the metal mold 2 .
  • a lot of chillers (chilling metals) 4 which form a cavity 24 are stacked and stored on the chiller holders 26 .
  • the chiller 4 is made of copper alloy which has excellent thermal conductivity.
  • an inner surface of the chiller has a cam piece original shape cast portion 41 and a notch cast portion 42 .
  • the notch cast portion 42 protrudes from an edge of one side of the chiller 4 (an edge on a left side in FIG. 5 ) toward inside of the cavity 24 around a perimeter.
  • a manufacturing worker inserts a sand core 31 inside the cavity 24 of the clamped metal mold 2 using a core driver 3 .
  • the manufacturing worker pours molten metal 51 into the metal mold 2 through the ingate 21 using a ladle 5 . Accordingly, the molten metal 51 flows through the sprue 22 and the runner 23 , and then into the cavity 24 and the opening 25 .
  • the molten metal 51 is injected into the metal mold 2 to form a cast material 7 which includes a coupling of cam pieces 6 .
  • the cavity 24 is formed by the chillers 4 . Therefore, as shown in FIG. 7 , the chillers 4 rapidly remove heat from the coupling of cam pieces 6 immediately after the molten metal 51 is injected, so as to make the coupling of cam pieces 6 chilled (be a white cast iron). As a result, tensile strength and shear strength of the coupling of cam pieces 6 decreases while the coupling of cam pieces 6 becomes harder.
  • cam piece original shapes (exterior component original shapes) 61 formed by cam piece original shape cast portions 41 (See FIG. 4 ) and notches (vulnerable portions) 62 formed by notch cast portions 42 (See FIG. 4 ) are alternately formed in the coupling of cam pieces 6 .
  • the manufacturing worker hits with a breaking tool 82 the notch 62 of the coupling of cam pieces 6 which is being held by a holder 81 .
  • the coupling of cam pieces 6 with low tensile strength breaks at the notch 62 which is the vulnerable portion so that an individual cam piece 9 is obtained.
  • the cam piece 9 has a cam surface 91 formed by the cam piece original shape cast portion 41 (See FIG. 7 ), a shaft hole 92 formed by the sand core 31 (See FIG. 7 ), and a side surface 93 which is a fracture surface.
  • the manufacturing worker rough-processes the cam surface 91 and/or cut-processes the shaft hole 92 as needed, and then fits and press-fits the cam piece onto the hollow shaft 101 .
  • the manufacturing worker attaches other exterior components such as a nosepiece and so on to the hollow shaft 101 , and then finish-grinds the cam surface 91 to form a cam profile so as to obtain the camshaft 100 shown in FIG. 1 .
  • the side surface 93 of the cam piece 9 retains to be a fracture surface.
  • the cam surface 91 slides on a corresponding piece (a rocker arm or a tappet).
  • the camshaft 100 which is assembled with an engine is not exposed. Therefore, there is no problem.
  • the cam piece 9 and the camshaft 100 are produced through the process steps described above. Therefore, productivity has been greatly improved compared with conventional apparatuses while the cam piece has become harder.
  • embodiments of the invention are not limited to this embodiment.
  • the embodiment is in a case where the invention is applied to a method for producing a cam piece.
  • the invention is also obviously applicable to the other exterior components such as a journal, an end piece, and so on.
  • the materials of the cam piece and the hollow shaft, as well as the specific structure of the metal mold, the material of the chiller, and so on are not limited to what are described in the embodiment, but are selectable or modifiable as needed in accordance with evaluation of cost or design, and so on.
  • the invention is applicable to production of an exterior component of an assembled camshaft used for a reciprocating engine, and contributes to improve productivity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)
US10/591,323 2004-03-03 2005-02-16 Method for producing exterior component of assembled camshaft Abandoned US20070175028A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2004-059157 2004-03-03
JP2004059157A JP2005248793A (ja) 2004-03-03 2004-03-03 組立式カムシャフト用外装部品の製造方法
PCT/JP2005/002299 WO2005085604A1 (ja) 2004-03-03 2005-02-16 組立式カムシャフト用外装部品の製造方法

Publications (1)

Publication Number Publication Date
US20070175028A1 true US20070175028A1 (en) 2007-08-02

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US10/591,323 Abandoned US20070175028A1 (en) 2004-03-03 2005-02-16 Method for producing exterior component of assembled camshaft

Country Status (3)

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US (1) US20070175028A1 (ja)
JP (1) JP2005248793A (ja)
WO (1) WO2005085604A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023249954A3 (en) * 2022-06-20 2024-02-08 Cummins Inc. Systems and methods for improving iron-based camshaft fatigue life

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010209796A (ja) * 2009-03-10 2010-09-24 Toyota Motor Corp カムシャフト支持構造
JP2012237200A (ja) * 2011-05-10 2012-12-06 Mitsubishi Motors Corp 組立カムシャフト
DE102016221449A1 (de) * 2016-11-02 2018-05-03 Volkswagen Aktiengesellschaft Verfahren zur Nachbearbeitung einer gebauten Funktionswelle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5122204A (en) * 1990-04-21 1992-06-16 Lydmet Limited Camshafts
US5201117A (en) * 1991-11-04 1993-04-13 General Motors Corporation Method and apparatus for sizing and cutting tubing

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4891305U (ja) * 1972-02-09 1973-11-02
JP2571820B2 (ja) * 1988-06-06 1997-01-16 日産自動車株式会社 再溶融チルカムシャフトの製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5122204A (en) * 1990-04-21 1992-06-16 Lydmet Limited Camshafts
US5201117A (en) * 1991-11-04 1993-04-13 General Motors Corporation Method and apparatus for sizing and cutting tubing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023249954A3 (en) * 2022-06-20 2024-02-08 Cummins Inc. Systems and methods for improving iron-based camshaft fatigue life

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JP2005248793A (ja) 2005-09-15
WO2005085604A1 (ja) 2005-09-15
WO2005085604A8 (ja) 2006-02-16

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AS Assignment

Owner name: HONDA MOTOR CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKUNO, KAZUAKI;HARADA, HIROHISA;REEL/FRAME:018287/0421;SIGNING DATES FROM 20060725 TO 20060801

STCB Information on status: application discontinuation

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