US3696224A - Transformer & inductor unit for heating valve seats - Google Patents

Transformer & inductor unit for heating valve seats Download PDF

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Publication number
US3696224A
US3696224A US151496A US3696224DA US3696224A US 3696224 A US3696224 A US 3696224A US 151496 A US151496 A US 151496A US 3696224D A US3696224D A US 3696224DA US 3696224 A US3696224 A US 3696224A
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United States
Prior art keywords
inductor
valve seat
carrier
primary
primary winding
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Expired - Lifetime
Application number
US151496A
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English (en)
Inventor
John C Lewis
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Park Ohio Holdings Corp
Original Assignee
Park Ohio Industries Inc
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Filing date
Publication date
Application filed by Park Ohio Industries Inc filed Critical Park Ohio Industries Inc
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Publication of US3696224A publication Critical patent/US3696224A/en
Anticipated expiration legal-status Critical
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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

  • the present invention relates to the art of induction heating and more particularly to a transformer and inductor unit for heating the valve seat of an engine block preparatory to quench hardening.
  • the invention is particularly applicable for inductively heating the conical surface of a valve seat in a gray cast iron engine block for an internal combustion engine, and it will be described with particular reference thereto; however, it must be appreciated that the invention has much broader applications and may be used for inductively heating many cylindrical, conical and flat surfaces.
  • induction heating devices for heating the conical surface of a valve seat in an engine block preparatory to quench hardening thereof.
  • an inductor is positioned adjacent the cylindrical surface and energized by a high frequency power source. This causes induction heating of the valve seat for subsequent quench hardening.
  • the inductor must be movable into and out of the valve seat for processing successive engine blocks. This presents a substantial difficulty in an induction heating installation.
  • the inductor itself must be connected onto the secondary of a transformer used to couple the power source to the inductor. Because of the reciprocal movement of the inductor, it has been suggested to use flexible leads between the inductor and the secondary.
  • an induction heating device for inductively heating the conical surface of a valve seat in an engine block for subsequent quench hardening which device comprises a fixed multi-turn primary winding having a central opening with an axis generally perpendicular to the turns, a carrier having first and second longitudinally spaced portions with a single turn sheet type secondary adjacent the first portion and a single turn inductor adjacent the second portion and leads electrically connecting the secondary and the inductor, and means for selectively shifting the carrier generally along the axis of the primary between a first position with the inductor substantially spaced from the valve seat a distance not corresponding to the proper magnetic coupling distance and a second position with the inductor magnetically coupled to the valve seat at the proper distance and with the secondary within the primary winding whereby energizing of the primary causes inductive heating of the valve seat.
  • the inductor may be moved away from the engine block for insertion and removal of the engine block from the induction heating station. Also, it is possible to move the inductor to change the spacing with the valve seat without moving the primary. Movement of the inductor carries with it the movement of the secondary so that the secondary is then positioned adjacent the primary winding of the transformer for proper energization of the inductor when the inductor is moved into the proper position to create the proper gap between the inductor and the valve seat.
  • the primary object of the present invention is the provision of a transformer and inductor unit for induction heating of the valve seat of an engine block preparatory to quench hardening, which unit simplifies the electrical and coolant connections for the total installation.
  • Another object of the present invention is the provision of a transformer and inductor unit for induction heating of the valve seat of an engine block preparatory to quench hardening, which unit is easy to install and reduces the number of flexible connections in the installation.
  • FIG. 1 is a schematic side elevational view illustrating the present invention
  • FIG. 2 is a partial 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 line 4-4 of FIG. 1;
  • FIG. 5 is a partial side elevational view illustrating, somewhat schematically, a second embodiment of the present invention.
  • FIG. 1 shows an engine block A having a plurality of spaced exhaust ports B with valve seats 10, lower rod bores 12 and machined surfaces 14.
  • a plurality of induction heating devices C are positioned with one device above each of the exhaust ports. These induction heating devices operate somewhat in unison with independent vertical adjustment; however, they are substantially identical in structure and only one of these units or devices will be described in detail.
  • a plurality of relatively fixed multi-turn primaries 20, 22, 24 are positioned directly above the exhaust ports B and are connected in series by leads 30, 32 with an appropriate high frequency power source 34.
  • the primaries are formed from a hollow conductor, and coolant is circulated therethrough by inlet 40 and outlet 42.
  • the fixed primary 20 used with the first of the induction heating devices C will be used in the following description.
  • a carrier 50 includes an upper support plate 52 and a lower insulated body 54 and is mounted to be generally along reciprocated within an appropriate guide arrangement schematically disclosed as guide surfaces 56, 58.
  • a single sheet secondary 60 having a hollow'structure is secured onto one end of the carrier 50 and includes a ductor 80 secured onto the insulated body 54 of carrier 50.
  • Coolant is circulated through secondary, through leads 70, 72 and through inductor 80.
  • a coolant inlet 90 connected by a flexible hose to a source of' coolant, not shown.
  • a circumferentially extending baffle 92 and anaxially extending baffle 94 causes the coolant to flow through the secondary 60 in accordance with the arrows shown in FIGS. 1, 2 and 3. Coolant then flows down through lead 70, around inductor 80 and up lead 72 into the secondary 60. Thereafter, the coolant passes then again through a different portion of the secondary, as shown by the arrows,.to the outlet 96 which is connected by a flexible lead to the next induction heating unit or to an ap limbate sump.
  • Carrier 50 includes a lower hose 100 for supporting a locator tip 102 which coacts with the bore 12 to locate the inductor 80 concentrically with respect to the valve seat 10 when the carrier 50 is in its lower position.
  • appropriate means illustrated as a double acting pneumatic cylinder 1 10 connected onto support plate 52 by a rod 112.
  • a threaded rod driven by a rotating nut can be used for moving the carrier 50 in a vertical direction with respect to the engine block A.
  • the movement can be between a position spaced from the engine block to the proper heating position or from a position with the inductor generally contacting the block to a back-off position with the inductor in the proper heating position.
  • a cylinder 110 is actuated to move the carrier 50 into an upper position.
  • an engine block A can be moved into proper position with the respective exhaust ports aligned with each of the induction heating devices C.
  • the cylinder 110 moves the carrier 50 downwardly into the position shown in FIG. 1 with the inductor 80 magnetically coupled with the valve seat 10.
  • the tip 102 locates the inductor 80 concentric with the valve seat. Downward position of the carrier can be controlled by a sensing device, a servomechanism or a fixed position. Also, the tip 102 could contact the surface 14 for location.
  • the power source 34 energizes the inductor to inductively heat the valve seat for. subsequent quenching in a manner well known in the art. After this has been done, the carrier 50 isthen shifted into its upper position for removal of the engine block and insertion of a subsequent engine block.
  • the inductor carrier 50 can be shifted from any position which does not provide a proper coupling gap between the inductor and valve seat to a position where the proper gap is obtained.
  • the primary surrounds the secondary 122, similar to the secondary 60, and the body 124 mounts inductor 126.
  • the inductor 126 is only closely spaced from the secondary 122.
  • Leads 130, 132 are relatively short as compared to the leads 70, 72 in the previously discussed embodiment of the present invention.
  • the length of the carrier is substantially reduced.
  • Coolant is introduced into the secondary through inlet 134 and is withdrawn from the secondary through outlet 136.
  • the coolant arrangement through the secondary, the connecting leads and the inductor is substantially similar to the coolant system employed in the first embodiment of theinvention.
  • An induction heating device for inductively heating the conical surfaces of two adjacent valve seats in an engine component for subsequent quench hardening, said device comprising: a heating unit for each valve seat, each of said units having a fixed multi-turn primary winding having a central opening with an axis generally perpendicular to said turns and a given axial length; a carrier having first and second longitudinally spaced portions, a single turn sheet type secondary adjacent said first portion and having a central axis generally coinciding with said axis of said primary winding, a single turn inductor adjacent said second portion and having a central axis generally parallel with said axis of said primary, and leads electrically connecting said secondary and said inductor; means for selectively shifting said carrier generally along said axis of said primary winding between a first positionand a second position with said inductor magnetically coupled to the valve seat associated with said unit at a desired spacing and with said secondary within said primary winding whereby energizing of said .primary causes inductive heating of said valve seat

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Heat Treatment Of Articles (AREA)
US151496A 1971-06-09 1971-06-09 Transformer & inductor unit for heating valve seats Expired - Lifetime US3696224A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15149671A 1971-06-09 1971-06-09

Publications (1)

Publication Number Publication Date
US3696224A true US3696224A (en) 1972-10-03

Family

ID=22539027

Family Applications (1)

Application Number Title Priority Date Filing Date
US151496A Expired - Lifetime US3696224A (en) 1971-06-09 1971-06-09 Transformer & inductor unit for heating valve seats

Country Status (9)

Country Link
US (1) US3696224A (OSRAM)
AU (1) AU432404B2 (OSRAM)
BR (1) BR7200656D0 (OSRAM)
CA (1) CA922790A (OSRAM)
DE (1) DE7143333U (OSRAM)
FR (1) FR2140987A5 (OSRAM)
GB (1) GB1364172A (OSRAM)
IT (1) IT945043B (OSRAM)
SE (1) SE379784B (OSRAM)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761669A (en) * 1972-12-01 1973-09-25 Park Ohio Industries Inc Method and apparatus for inductively heating valve seats
US3777096A (en) * 1971-06-09 1973-12-04 Park Ohio Industries Inc Apparatus for inductively heating valve seats
US3789180A (en) * 1972-12-26 1974-01-29 Park Ohio Industries Inc Modified inductor for inductively heating valve seats
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
US4700036A (en) * 1985-06-24 1987-10-13 Tocco, Inc. Induction heating device with improved locking mechanism for slidable inductors

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2223902A (en) * 1936-08-20 1940-12-03 Howard E Somes Transformer distributing system
US2241431A (en) * 1938-04-21 1941-05-13 Howard E Somes Electric coil and core therefor
US2256873A (en) * 1935-11-21 1941-09-23 Howard E Somes Inside induction heater
US2281297A (en) * 1936-08-17 1942-04-28 Budd Induction Heating Inc Induction heat treating apparatus
US2496950A (en) * 1946-07-31 1950-02-07 Western Electric Co High-frequency heating apparatus for sequentially brazing a plurality of parts in a protective atmosphere
US2757268A (en) * 1953-04-21 1956-07-31 Westinghouse Electric Corp Electrical heating apparatus
US2764660A (en) * 1954-03-30 1956-09-25 Gen Electric Induction heating apparatus
FR1537394A (fr) * 1966-09-23 1968-08-23 Acec Inducteur de chauffage
US3472991A (en) * 1967-11-14 1969-10-14 Aeg Elotherm Gmbh Inductor for surface-hardening rotating shafts

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2256873A (en) * 1935-11-21 1941-09-23 Howard E Somes Inside induction heater
US2281297A (en) * 1936-08-17 1942-04-28 Budd Induction Heating Inc Induction heat treating apparatus
US2223902A (en) * 1936-08-20 1940-12-03 Howard E Somes Transformer distributing system
US2280861A (en) * 1936-08-20 1942-04-28 Budd Induction Heating Inc Transformer distributing system
US2241431A (en) * 1938-04-21 1941-05-13 Howard E Somes Electric coil and core therefor
US2496950A (en) * 1946-07-31 1950-02-07 Western Electric Co High-frequency heating apparatus for sequentially brazing a plurality of parts in a protective atmosphere
US2757268A (en) * 1953-04-21 1956-07-31 Westinghouse Electric Corp Electrical heating apparatus
US2764660A (en) * 1954-03-30 1956-09-25 Gen Electric Induction heating apparatus
FR1537394A (fr) * 1966-09-23 1968-08-23 Acec Inducteur de chauffage
US3472991A (en) * 1967-11-14 1969-10-14 Aeg Elotherm Gmbh Inductor for surface-hardening rotating shafts

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777096A (en) * 1971-06-09 1973-12-04 Park Ohio Industries Inc Apparatus for inductively heating valve seats
US3761669A (en) * 1972-12-01 1973-09-25 Park Ohio Industries Inc Method and apparatus for inductively heating valve seats
US3789180A (en) * 1972-12-26 1974-01-29 Park Ohio Industries Inc Modified inductor for inductively heating valve seats
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
EP0168130A3 (en) * 1984-07-06 1986-10-08 Tocco, Inc. Apparatus and method of hardening valve seats
US4700036A (en) * 1985-06-24 1987-10-13 Tocco, Inc. Induction heating device with improved locking mechanism for slidable inductors

Also Published As

Publication number Publication date
DE7143333U (de) 1972-02-24
SE379784B (OSRAM) 1975-10-20
FR2140987A5 (OSRAM) 1973-01-19
CA922790A (en) 1973-03-13
GB1364172A (en) 1974-08-21
BR7200656D0 (pt) 1973-05-03
IT945043B (it) 1973-05-10
AU432404B2 (en) 1973-02-22
AU3571871A (en) 1973-02-22

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