WO2005085604A1 - 組立式カムシャフト用外装部品の製造方法 - Google Patents
組立式カムシャフト用外装部品の製造方法 Download PDFInfo
- Publication number
- WO2005085604A1 WO2005085604A1 PCT/JP2005/002299 JP2005002299W WO2005085604A1 WO 2005085604 A1 WO2005085604 A1 WO 2005085604A1 JP 2005002299 W JP2005002299 W JP 2005002299W WO 2005085604 A1 WO2005085604 A1 WO 2005085604A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- exterior component
- cam
- cam piece
- manufacturing
- exterior
- Prior art date
Links
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 present invention relates to a method for manufacturing an exterior part for an assembled camshaft used in a reciprocating engine.
- a valve operating mechanism of a reciprocating engine As a valve operating mechanism of a reciprocating engine, a rocker arm, a swing arm, and the like are interposed between a cam and an intake / exhaust valve.
- a direct drive type with a cam located directly above the valve (tappet) is adopted.
- As a camshaft on which a cam is formed an integrated product formed by forging, forging, or cutting is generally used.However, the mechanical properties (rigidity, hardness, lubricity, etc.) of the cam lobe and shaft are different.
- An assembling type power shaft is composed of, for example, a hollow shaft made of steel pipe or the like and exterior parts such as a cam piece and a nose piece. Is fixed.
- Exterior parts for assembling camshafts are manufactured by various manufacturing methods, and the following methods are known.
- a cutting and grinding process is performed on the outer peripheral surface of a hollow rod material to form a cam piece material having a predetermined cam profile, and then to a predetermined width.
- a method of obtaining a cam piece (ring-section cam) by cutting (see Patent Document 1), or cutting and grinding the outer peripheral surface of a solid bar to produce a cam piece material having a predetermined cam profile
- Patent Document 2 A method of obtaining a cam piece by subjecting a base material to a surface hardening treatment, cutting the base material to a predetermined width, and drilling a shaft hole has been proposed (see Patent Document 2).
- Patent Document 1 Japanese Utility Model Application Laid-Open No. 52-41404 (paragraphs [0015] — [0022], FIGS. 1 and 6)
- Patent Document 2 Japanese Patent Application Laid-Open No. 3-15609 (Example, FIG. 1)
- Patent Document 3 JP-A-2003-285138 (paragraphs [0042]-[0046], FIG. 1)
- Patent Document 4 JP-A-9-256819 (paragraphs [0008], [0009], FIG. 1)
- Patent Document 1 and Patent Document 2 are methods for forming a cam piece from a hollow or solid bar by using a mechanical machine, and therefore, an apparatus for forming a cam profile ( In addition to the necessity of a cutting device that cuts cam pieces from the NC piece (such as an NC copying machine) and a cam piece material, there were problems such as a large amount of time and man-hours required for manufacturing.
- the manufacturing methods described in Patent Document 3 and Patent Document 4 are methods for obtaining cam pieces by forging and forging, but since there are limitations on the cavity layout and the like in the die, the production method is limited. Forging process ⁇ The number of cam pieces obtained in the forging process could not be increased so much that there were problems such as difficulty in increasing productivity.
- the present invention has been made in view of such a technical background.
- a method for manufacturing an exterior component for an assembling camshaft includes manufacturing an exterior component composite body in which a plurality of exterior component shapes having a shaft insertion hole are coupled with a fragile portion interposed therebetween. It is characterized by including a forming step of forming and a dividing step of breaking the exterior component coupled body at the fragile portion to obtain an exterior component.
- an exterior component combination having a large number of exterior component shapes and fragile portions can be obtained by a single fabrication process, and further, the fragile portion of the exterior component combination is air-hammered or manually operated. A large number of exterior parts can be manufactured in a short time by being hit and broken.
- the molten metal such as steel is also poured into the mold. pour it up. Then, when the exterior component composite is obtained, set it on the jig and sharpen the notch An exterior part is obtained by hitting with a tool having a cutting edge and breaking it.
- the manufacturing process may include a step of tilting the exterior component assembly.
- the hardness of the exterior component can be increased, and at the same time, the fracture at the fragile portion of the exterior component composite can be facilitated.
- the molten metal is rapidly cooled by, for example, forming a nest made of a copper alloy or the like into a chiller to chill the external component coupling body.
- FIG. 1 is a perspective view showing an assembled camshaft according to an embodiment.
- FIG. 2 is a sectional view of a main part of an 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 a main part of a metal mold.
- FIG. 5 is a perspective view showing a part of a leaflet.
- FIG. 6 is an explanatory view showing a step of manufacturing a cam piece composite.
- Fig. 7 is an explanatory view showing a state in which heat is taken away by the flicker in the cam piece combined physical strength.
- FIG. 8 is a perspective view showing a cam piece coupling body.
- FIG. 9 is an explanatory view showing a breaking step of a cam piece composite.
- FIG. 10 is a perspective view of a cam piece.
- FIG. 11 is an explanatory view showing a camshaft assembling step.
- a camshaft 100 shown in FIGS. 1 and 2 is a camshaft that drives an intake valve of a four-stroke DOHC four-cylinder engine, and is manufactured by fixing a cam piece 9 and an end piece 102 to a hollow shaft 101.
- the hollow shaft 101 is made of a cold drawn steel pipe (for example, This is a machined product made of carbon steel pipe for machine structure (STKM17C, etc.), and its outer peripheral surface is ground and finished with reference to the center at both ends.
- the cam piece 9 and the end piece 102 are made of steel (for example, low alloy steel, steel SCNCrM2), and are fitted and fixed to the hollow shaft 101 by press fitting (or brazing). Been! RU
- the fabrication equipment 1 includes a two-piece mold dies 2 and a core driving device 3 for inserting a sand core 31 into the molds 2 as main components.
- the molding die 2 includes a receiving slot 21 for injecting the molten metal, a spout 22 extending downward from the receiving port 21, a runner 23 for guiding the molten metal from the spout 22 horizontally, and a tip of the runner 23.
- a cavity 24 extending upwardly from the opening; and an opening 25 formed at the upper end of the cavity 24.
- the metal mold 2 is provided with a flier holding portion 26, and a plurality of fliers (cooling metal) 4 forming the cavity 24 are attached to the flier holding portion 26. It is stored in a stacked state on 26.
- the chiller 14 is made of a copper alloy having excellent heat conductivity, and has a cam piece element forming portion 41 and a notch forming portion 42 on its inner surface as shown in FIG. The notch forming portion 42 is formed on the entire circumference so as to protrude into the cavity 24 from one end of the flyer 14 (the left end in FIG. 5).
- the manufacturing operator uses the core driving device 3 to insert the sand core into the cavity 24 of the mold die 2 that has been clamped. Insert 31.
- the manufacturing worker pours the molten metal 51 from the receiver 21 into the metal mold 2 using the ladle 5. Then, the molten metal 51 flows into the cavity 24 and the opening 25 via the gate 22 and the runner 23.
- the molten metal 51 When the molten metal 51 is injected into the molding die 2, as shown in FIG. 6 (c), it becomes a plug-in product 7 including the cam piece coupling body 6.
- the cavities 24 are formed in the chillers 14, as shown in FIG. 7, the force immediately after the injection of the molten metal 51 is quickly removed by the chillers 14. And chill (white iron).
- the cam piece composite 6 has a very high hardness, but has a low tensile strength and shear strength.
- the core driving device 3 causes the sand core 31 to be released and retracted (moved up).
- the manufacturing worker opens the molding die 2, removes the packaged product 7, removes unnecessary parts (the part corresponding to the runner 23 and the opening 25 of the molding die 2) and the sand core 31 to remove the cam piece.
- Get Coupling 6 As shown in FIG. 8, the cam piece assembly 6 has a cam piece shape (exterior part shape) 61 formed by the cam piece shape forming portion 41 (see FIG. 4) and a notch formed by the notch forming portion 42 (see FIG. 4). (Fragile part) 62 are formed alternately.
- the manufacturing worker hits the notch 62 with the breaking tool 82 while the cam piece coupling body 6 is held by the holding device 81. Then, the cam piece composite 6 having a low tensile strength is broken at the notch 62 which is a weak portion, and individual cam pieces 9 are obtained.
- the cam piece 9 has a cam surface 91 formed by the cam piece forming part 41 (see FIG. 7), a shaft hole 92 formed by the sand core 31 (see FIG. 7), and It has a side surface 93 that is a fractured surface.
- the manufacturing operator cuts the ft3 ⁇ 4 shaft hole 92 on the cam surface 91 and then fits the hollow to the hollow shaft 101 as shown in Fig. 11. And press-fit.
- the manufacturing worker attaches other exterior parts such as a nosepiece to the hollow shaft 101, and then performs a grinding finish to form a cam profile on the cam surface 91, and the camshaft 100 shown in FIG. Get.
- the camshaft 100 As shown in FIG. 1, in the camshaft 100, only the cam surface 91 slides on the force counterpart (the rocking force arm tappet) in which the side surface 93 of the cam piece 9 remains a broken surface.
- the camshaft 100 is not exposed when assembled to the engine.
- the productivity can be significantly improved as compared with the conventional apparatus while increasing the hardness of the cam piece.
- the description of the specific embodiment is finished above, but aspects of the present invention are not limited to this embodiment.
- the present invention is applied to a method of manufacturing a cam piece.
- the present invention is naturally applicable to other exterior parts such as a journal and an end piece.
- the specific structure of the mold and the material of the insert are not limited to those described in the above embodiment. It can be selected or changed as appropriate based on accounting or cost judgment. Possibility of industrial use
- This invention can be utilized for manufacture of the exterior part for assembly type camshafts used for a reciprocating engine, and contributes to the improvement of the productivity.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/591,323 US20070175028A1 (en) | 2004-03-03 | 2005-02-16 | Method for producing exterior component of assembled camshaft |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
JP2004-059157 | 2004-03-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005085604A1 true WO2005085604A1 (ja) | 2005-09-15 |
WO2005085604A8 WO2005085604A8 (ja) | 2006-02-16 |
Family
ID=34917961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20070175028A1 (ja) |
JP (1) | JP2005248793A (ja) |
WO (1) | WO2005085604A1 (ja) |
Families Citing this family (4)
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 |
WO2023249954A2 (en) * | 2022-06-20 | 2023-12-28 | Cummins Inc. | Systems and methods for improving iron-based camshaft fatigue life |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4891305U (ja) * | 1972-02-09 | 1973-11-02 | ||
JPH01310113A (ja) * | 1988-06-06 | 1989-12-14 | Nissan Motor Co Ltd | 再溶融チルカムシャフトの製造方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9009004D0 (en) * | 1990-04-21 | 1990-06-20 | Lydmet Ltd | Camshafts |
US5201117A (en) * | 1991-11-04 | 1993-04-13 | General Motors Corporation | Method and apparatus for sizing and cutting tubing |
-
2004
- 2004-03-03 JP JP2004059157A patent/JP2005248793A/ja not_active Withdrawn
-
2005
- 2005-02-16 US US10/591,323 patent/US20070175028A1/en not_active Abandoned
- 2005-02-16 WO PCT/JP2005/002299 patent/WO2005085604A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4891305U (ja) * | 1972-02-09 | 1973-11-02 | ||
JPH01310113A (ja) * | 1988-06-06 | 1989-12-14 | Nissan Motor Co Ltd | 再溶融チルカムシャフトの製造方法 |
Also Published As
Publication number | Publication date |
---|---|
JP2005248793A (ja) | 2005-09-15 |
US20070175028A1 (en) | 2007-08-02 |
WO2005085604A8 (ja) | 2006-02-16 |
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