US3621733A - Inductively-hardened steel components containing an oil duct - Google Patents

Inductively-hardened steel components containing an oil duct Download PDF

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Publication number
US3621733A
US3621733A US862394A US3621733DA US3621733A US 3621733 A US3621733 A US 3621733A US 862394 A US862394 A US 862394A US 3621733D A US3621733D A US 3621733DA US 3621733 A US3621733 A US 3621733A
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US
United States
Prior art keywords
oil duct
hardened
oil
extending
inductively
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
US862394A
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English (en)
Inventor
Gerhard Seulen
Hermann Kuhlbars
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.)
SMS Elotherm GmbH
Original Assignee
AEG Elotherm GmbH
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
Priority claimed from DE19681802027 external-priority patent/DE1802027C/de
Application filed by AEG Elotherm GmbH filed Critical AEG Elotherm GmbH
Application granted granted Critical
Publication of US3621733A publication Critical patent/US3621733A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/06—Crankshafts
    • F16C3/14—Features relating to lubrication
    • 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
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49702—Lubricating
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2173—Cranks and wrist pins
    • Y10T74/2185—Lubricated

Definitions

  • the invention provides means whereby the wear is reduced, comprising a supplementary opening extending from the hardened surface to the oil duct on the side of the oil duct which makes an oblique angle with the hardened surface.
  • the supplementary opening consists of a slot extending from the oil duct, and in another embodiment the supplementary opening consists of a bore extending to the said oil duct.
  • the supplementary opening may be a complex slot having portions extending in the general direction of the said oil duct branches.
  • This invention relates to the improvement of the torsional and bending strengths of mechanical components, such as for example shafts, particularly crankshafts for spark-ignition and compression-ignition internal combustion engines, and compressors, pumps and the like.
  • the areas in such hardened components surrounding the openings of oil ducts are critical, because in these zones, particularly at the edges of the openings, the penetration of inductive hardening is greater than elsewhere. This increase in the depth of the hardened zone is due to the fact that the oil ducts impede the free flow of heat during hardening. Moreover, in inductive hardening the current filaments are more densely spaced around the edges of the oil ducts and thus generate a particularly large amount of heat in this region.
  • FIG. 1 of the accompanying drawings is a longitudinal section of a crankpin containing an oil-hole.
  • the crankpin 1 is traversed by an oil duct 2 which extends directly from the pin through the web to the surface of an adjoining crankpin.
  • the hardened zone '3 in those parts of the surface that contain no oil-hole is parallel to the surface.
  • the oil ducts are filled with substances that at a given temperature release water of crystallisation. Although this also leads to a reduction of excessive temperatures the effect thereby obtained is not sufiicient.
  • This improvement in resistance and strength is achieved according to the invention by providing in the region where the accumulation of material at the lip of the oil hole is a minimum, i.e., where the wall of the oil duct makes an acute angle with the adjoining workpiece surface, a supplementary opening between the hardened surface and the oil duct the cross-section of which is rounded at least on the side remote from the said oil duct.
  • the said supplementary opening has the form of a slot extending from the wall of the oil hole and which is provided with fillets at the transistions between the base and the sides of the slot.
  • the said supplementary opening is a bore which extends from the hardened surface into the oil hole.
  • the width of the slot or the diameter of the bore constituting the supplementary opening of the invention will depend upon the size of the workpiece itself.
  • the width may for example be between 0.5 and 1.5 mm. It does not matter whether this supplementary opening is provided before or after inductive heating, as steel parts that have already been hardened can readily be machined by spark erosion or electrolytic techniques.
  • FIGS. 2 to 5 of the accompanying drawings in which:
  • FIG. 2 and FIG. 3 are a plan view and longitudinal section respectively showing features of the invention
  • FIG. 4 and FIG. 4a are a plan view and a longitudinal section respectively of a further embodiment of the invention.
  • FIG. shows a configuration of the slot according to the invention when several oil duct branches share a common entry hole in a crankshaft.
  • the plan view of the crankshaft of FIG. 2 has an oil duct 2 which extends in the direction of the workpiece axis from the surface of the left-hand bearing, traverses the web of the crank and ends in the surface of the underside of the right hand bearing.
  • the course taken by this oil duct through the shaft is more clearly shown in FIG. 3.
  • the oil ducts are provided with a slot 5 which has fillets 6 at its base.
  • crankshaft A similar improvement of the properties of the crankshaft may be achieved if the slot is simply replaced by a bore 7 as in FIG. 4 and FIG. 4a.
  • the occurrence of hardening cracks may not be avoided but it has been found from experience that all these craoks extend into the bore 7 and that they do not continue beyond the bore.
  • the invention may also be applied when the courses taken by the oil ducts are more complex, as indicated in FIG. 5 where two oil ducts 9 and 10 extending at different angles share a common entry hole 2. Consequently in FIG. 5 two slots extending in the directions of the different oil ducts are provided instead of only one and the two ducts combine to form a slot 8.
  • An inductively-hardened steel component containing an oil duct extending obliquely from a hardened surface thereof, in which a supplementary opening is provided in the region of the said oil duct where the wall of the said oil duct makes an acute angle with the said hardened surface and where the minimum material is between said oil duct and said surface, the said supplementary opening extending from the said hardened surface to the said oil duct.
  • An inductively-hardened steel component containing a plurality of oil duct branches extending at an angle one to the other from a common point on the hardened surface thereof, in which a complex slot is provided in the region of the said oil ducts where the wall of the said oil ducts make an acute angle with the said hardened surface, the said slot extending from the said common point having slot portions extending in the direction of the said oil duct branches, and having rounded surfaces at least on the sides remote from the said common part.
  • An inductively-hardened steel crankshaft comprising at least one oil duct extending obliquely from a hardened surface thereof, and a supplementary opening extending from the said hardened surface to the said oil duct at a point where the said oil duct makes an acute angle with the said hardened surface, the cross-section of the said supplementary opening being rounded at least at a position remote from the said oil duct.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Ocean & Marine Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Heat Treatment Of Articles (AREA)
US862394A 1968-10-09 1969-09-30 Inductively-hardened steel components containing an oil duct Expired - Lifetime US3621733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681802027 DE1802027C (de) 1968-10-09 Induktionsgehartetes mechanisches Bauteil mit erhöhter Verschleiß , Torsions und Biegefestigkeit

Publications (1)

Publication Number Publication Date
US3621733A true US3621733A (en) 1971-11-23

Family

ID=5710060

Family Applications (1)

Application Number Title Priority Date Filing Date
US862394A Expired - Lifetime US3621733A (en) 1968-10-09 1969-09-30 Inductively-hardened steel components containing an oil duct

Country Status (3)

Country Link
US (1) US3621733A (enrdf_load_stackoverflow)
FR (1) FR2020185A1 (enrdf_load_stackoverflow)
GB (1) GB1262918A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824659A (en) * 1973-03-05 1974-07-23 Maschf Augsburg Nuernberg Ag Crankshaft with hardened transition portions and its manufacture
US4876916A (en) * 1986-12-18 1989-10-31 Von Roll, Ag Cast shafts, particularly camshafts
US4928550A (en) * 1988-10-06 1990-05-29 Ndc Company, Ltd. Sliding bearing and crankshaft used for crankshaft-connecting rod assembly
US5373635A (en) * 1991-11-07 1994-12-20 Nippon Thompson Co., Ltd. Method of manufacturing a linear motion guide unit
US5836218A (en) * 1995-12-20 1998-11-17 Hyundai Motor Company, Ltd. Crankshaft for cooling pistons
US20140260787A1 (en) * 2013-03-18 2014-09-18 Electro-Motive Diesel, Inc. Selectively strengthened crankshaft

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824659A (en) * 1973-03-05 1974-07-23 Maschf Augsburg Nuernberg Ag Crankshaft with hardened transition portions and its manufacture
US4876916A (en) * 1986-12-18 1989-10-31 Von Roll, Ag Cast shafts, particularly camshafts
US4928550A (en) * 1988-10-06 1990-05-29 Ndc Company, Ltd. Sliding bearing and crankshaft used for crankshaft-connecting rod assembly
US5373635A (en) * 1991-11-07 1994-12-20 Nippon Thompson Co., Ltd. Method of manufacturing a linear motion guide unit
US5836218A (en) * 1995-12-20 1998-11-17 Hyundai Motor Company, Ltd. Crankshaft for cooling pistons
US20140260787A1 (en) * 2013-03-18 2014-09-18 Electro-Motive Diesel, Inc. Selectively strengthened crankshaft

Also Published As

Publication number Publication date
GB1262918A (en) 1972-02-09
DE1802027B2 (de) 1972-10-19
FR2020185A1 (enrdf_load_stackoverflow) 1970-07-10
DE1802027A1 (de) 1970-04-16

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