US3686459A - Multiple inductor unit for induction heat device - Google Patents

Multiple inductor unit for induction heat device Download PDF

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Publication number
US3686459A
US3686459A US190965A US3686459DA US3686459A US 3686459 A US3686459 A US 3686459A US 190965 A US190965 A US 190965A US 3686459D A US3686459D A US 3686459DA US 3686459 A US3686459 A US 3686459A
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Prior art keywords
inductor
secondaries
axes
spaced
units
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Expired - Lifetime
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US190965A
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English (en)
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John C Lewis
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Park Ohio Holdings Corp
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Park Ohio Industries Inc
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces

Definitions

  • This invention relates to the art of induction heating, and more particularly to a multiple inductor unit for induction heating device.
  • the invention is particularly applicable for inductively heating the conical surfaces of two adjacent exhaust valves in the head of an internal combustion engine, and will be described with particular reference thereto; however, it should be appreciated that the invention has much broader applications and may be used for inductively heating a variety of closely spaced surfaces.
  • the head of the engine In production of an internal combustion engine, the head of the engine generally includes a plurality of intake and exhaust valve seats, which are conical surfaces against which poppet valves close to control the intake and exhaust ports of the engine.
  • intake and exhaust valve seats With the advent of gasolines having relatively low lead content, it has been found necessary to harden the conical surfaces of the exhaust valve seats so that they. can withstand the high temperatures and repetitive contact with the poppet valves.
  • the most successful approach has been to heat the conical surfaces inductively and then allow air quenching or water quenching thereof.
  • This induction heating operation is generally accomplished by a plurality of closely spaced inductor units, each having an inner single-turn inductor and an outer single-turn secondary winding.
  • Appropriate leads connect the inductor onto the secondary winding, and these components are movable with respect to the exhaust valve seats located in the head of the engine.
  • the proper magnetic coupling can be obtained for each of the various exhaust valve seats.
  • a multi-tum primary winding was provided around each of the secondary windings of the separate inductor units for inducing a current flow in the secondary winding and, thus, in the inductor of each unit during the induction heating operation. The use of these inductor units has been quite satisfactory;
  • an induction heating device including at least two inductor units for heating adjacent conical surfaces, which device allows relatively close positioning of the inductors without complex offsetting structures for the inductors and by employing the standard structure for securing the inductor onto the inductor unit.
  • an improvement in the structure for heating two adjacent exhaust valve seats which improvement involves the use of a single multi-tum primary winding.
  • the single primary winding is inductively coupled to two single-turn secondaries for energizing two separate inductors connected to the secondaries.
  • the two secondaries can be positioned directly adjacent to each other and the inductors connected thereto can be directly below the secondaries and still be closely adjacent to each secondary winding connected thereto, which device employs a single primary winding inductively coupled to both of the secondaries of the respective inductor units.
  • FIG. 1 is a side elevational view showing, somewhat schematically, the preferred embodiment of the present invention
  • FIG. 2 is a cross-sectional view taken generally along line 22 of FIG. 1;
  • FIG. 3 is a cross-sectional view taken generally along line 3-3 of FIG. 1;
  • FIG. 4 is a cross-sectional view taken generally along line 4-4 of FIG. 1.
  • the figures show an induction heating device A positioned adjacent an internal combustion engine block B having closely adjacent exhaust ports l0, 12 with central axes a, b, respectively, spaced from each other a distance c. Concentric with these axes are conical exhaust valve ports 14, 16, respectively, and guide bores 20, 22, respectively. To heat inductively the adjacent conical valve seats 14, 16, there are provided two inductor units C, D which are essentially identical in structure; therefore, only the inductor unit C will be described in detail, and this description will apply equally to the inductor unit D.
  • Inductor unit C includes an insulated support structure 30 having a central body 32, an upper portion 34 for supporting a secondary winding, and a lower tip 36. Onto the tip is positioned a nose 38 which extends into, and registers with, bore 20. This registration aligns the inductor unit C for heating of the seat 14 preparatory to subsequent quenching by air, liquid or other appropriate media, not shown. Secured onto the upper secondary supporting portion 34, there is a plate 40. A
  • translating or moving means 42 taking the form of a hydraulic cylinder having rod 44 secured by a joint 46 onto plate 40, causes selective movement of the plate 40 in a vertical direction generally parallel to axis a.
  • the corresponding conductor unit D includes an axis y which is spaced from axis x a distance z, which distance is substantially greater than the distance between the axis a of bore 20 and axis b of bore 22.
  • Axes a, b are concentric with the surfaces 14, 16 and also the inductor 50 on each of the inductor units C, D.
  • the inductor and leads 52, 54 are constructed of the normal hollow inductor type material.
  • Secondary 60 is hollow and is provided with an appropriate circumferentially extending baffle 62 and axially extending baffle 64. These baffles are so arranged that the coolant from an inlet 66 passes, in the manner indicated by the arrows, through a first portion of the secondary 60, through the lead 52, around the inductor 50, through the lead 54, through a second portion of the secondary 60 divided by the partition 64, and, then, through an outlet 68.
  • the particular manner for cooling the secondary and inductor does not form a part of the invention and the arrangement shown is for the purpose of illustration only. Other cooling arrangements could be employed to cool the secondary 60 and the inductor 50.
  • the moving means 42 moves the inductor 50 between at least two positions. In the first position the inductor 50 is adjacent the surfaces 14, 16 preparatory to heating. In the second position the inductor is substantially spaced from the seat 14 to allow loading and unloading of the head B.
  • the secondaries 60 of the inductor units C, D are inductively coupled with a single multi-turn primary 70 surrounding the two secondaries and having input leads 72, 74 connected across the output of an RF power supply 76. By employing a single primary for the two secondaries 60, spacing m between the secondaries can be maintained at a relatively low valve only sufficient to prevent accidental contact and arcing between the two secondaries.
  • the spacing between the inductors 50 can be substantially less than the spacing heretofore possible in this type of apparatus.
  • these two inductors can be located with a spacing which generally corresponds to spacing of the secondaries 60, i.e., spacing m.
  • the coupling between the primary and secondary is somewhat less than that which could be accomplished by employing a separate primary for each secondary; however, appropriate adjustments can be made in the input circuits for the primary to compensate for this reduction in the inductive coupling between the primary and secondary.
  • an induction heating device for inductively heating adjacent, first and second generally conical surfaces having generally parallel axes, said device comrising: a first inductor unit for inductively heatin said rrst surface; a second inductor unrt for rnduc rvely heating said second unit; each of said units including an inductor generally matching its respective surface, means for supporting said inductor,- a transformer secondary electrically connected to said inductor and carried by said support means, and means for moving said support means in a direction generally parallel with said surface axis between a first position with said inductor substantially spaced from said respective surface and a second position with said inductor adjacent to its respective surface; and means for inducing current flow into said transformer secondary, the improvement comprising: said current inducing means includes a single multi-tum primary winding surrounding both of said transformer secondaries of said first and second inductor units.
  • An induction heating device for heating two spaced portions of a workpiece, said device comprising: a first inductor unit including a first inductor adapted to heat the first of said portions and a first secondary winding connected to said first inductor, I
  • first and second inductors have axesspaced from each other a distance less than the spacing between said first and said second central axes.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
US190965A 1971-10-20 1971-10-20 Multiple inductor unit for induction heat device Expired - Lifetime US3686459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19096571A 1971-10-20 1971-10-20

Publications (1)

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US3686459A true US3686459A (en) 1972-08-22

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ID=22703525

Family Applications (1)

Application Number Title Priority Date Filing Date
US190965A Expired - Lifetime US3686459A (en) 1971-10-20 1971-10-20 Multiple inductor unit for induction heat device

Country Status (7)

Country Link
US (1) US3686459A (enrdf_load_stackoverflow)
JP (1) JPS5210729B2 (enrdf_load_stackoverflow)
CA (1) CA940201A (enrdf_load_stackoverflow)
FR (1) FR2156846B1 (enrdf_load_stackoverflow)
GB (1) GB1386179A (enrdf_load_stackoverflow)
IT (1) IT972353B (enrdf_load_stackoverflow)
SE (1) SE389788B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292489A (en) * 1978-12-01 1981-09-29 The Continental Group, Inc. Tab heating and applying apparatus
US4535212A (en) * 1984-07-06 1985-08-13 Tocco, Inc. Apparatus and method of hardening valve seats
US4538041A (en) * 1983-08-24 1985-08-27 Park-Ohio Industries, Inc. Rotating induction heating apparatus
US5994682A (en) * 1997-12-08 1999-11-30 Power House Tool, Inc. Induction heating device with a quick disconnect terminal and method of use

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53136215U (enrdf_load_stackoverflow) * 1977-04-04 1978-10-27

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574564A (en) * 1947-11-14 1951-11-13 Asea Ab Apparatus for partial surface hardening of crankshafts, camshafts, or like workpieces
US2828397A (en) * 1954-10-28 1958-03-25 Westinghouse Electric Corp Induction heating apparatus
US3397297A (en) * 1966-02-24 1968-08-13 Ca Atomic Energy Ltd Induction heating apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1378187A (en) * 1918-10-09 1921-05-17 Ajax Electrothermic Corp Focus inductor-furnace
FR25811E (fr) * 1921-10-19 1923-05-28 Machine unipolaire à courant continu
US1980875A (en) * 1930-01-01 1934-11-13 Ajax Electrothermic Corp Electric induction furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574564A (en) * 1947-11-14 1951-11-13 Asea Ab Apparatus for partial surface hardening of crankshafts, camshafts, or like workpieces
US2828397A (en) * 1954-10-28 1958-03-25 Westinghouse Electric Corp Induction heating apparatus
US3397297A (en) * 1966-02-24 1968-08-13 Ca Atomic Energy Ltd Induction heating apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292489A (en) * 1978-12-01 1981-09-29 The Continental Group, Inc. Tab heating and applying apparatus
US4538041A (en) * 1983-08-24 1985-08-27 Park-Ohio Industries, Inc. Rotating induction heating apparatus
US4535212A (en) * 1984-07-06 1985-08-13 Tocco, Inc. Apparatus and method of hardening valve seats
US5994682A (en) * 1997-12-08 1999-11-30 Power House Tool, Inc. Induction heating device with a quick disconnect terminal and method of use

Also Published As

Publication number Publication date
JPS5210729B2 (enrdf_load_stackoverflow) 1977-03-25
FR2156846A1 (enrdf_load_stackoverflow) 1973-06-01
SE389788B (sv) 1976-11-15
FR2156846B1 (enrdf_load_stackoverflow) 1975-03-14
GB1386179A (en) 1975-03-05
CA940201A (en) 1974-01-15
JPS4850334A (enrdf_load_stackoverflow) 1973-07-16
IT972353B (it) 1974-05-20

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