US3315333A - Method of producing base assemblies for ignition distributors - Google Patents

Method of producing base assemblies for ignition distributors Download PDF

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Publication number
US3315333A
US3315333A US390973A US39097364A US3315333A US 3315333 A US3315333 A US 3315333A US 390973 A US390973 A US 390973A US 39097364 A US39097364 A US 39097364A US 3315333 A US3315333 A US 3315333A
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US
United States
Prior art keywords
extension
slug
cavity
cup
base assembly
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
US390973A
Other languages
English (en)
Inventor
Kind Wilhelm
Schneider Karl-Heinz
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3315333A publication Critical patent/US3315333A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
    • 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
    • Y10T29/49002—Electrical device making
    • Y10T29/49105—Switch 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
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body

Definitions

  • the present invention relates to ignition distributors for automotive vehicles or the l-ike, and more particularly to an improved method of producing base assemblies for such ignition distributors.
  • ignition distributors for internal combust-ion engines of automotive vehicles normally comprise a base assembly and a cap which is detachably coupled to the open end of the base assembly.
  • the latter includes a cupped portion whose bottom wall is provided with a cylindrical sleeve to receive the drive shaft of the ignition distributor.
  • Such base assemblies are no1'- mally produced by casting which means that the factory in which the lignition distributors are assembled must have a casting plant and expensive conveyors which deliver castings to the assembling station. The castings must undergo a series of secondary treatments which add considerably to the cost of the ultimate product.
  • the castings consist of gray iron, but ,it is also known to make the base assembly of aluminum alloys It is an important object of the present invention to provide an improved method of mass-producing base as semblies for ignition distributors in such a way that the casting operation may be dispensed with, that the cup and the bearing sleeve of the base assembly invariably form an integral unit, and that the resulting article requires minimal aftertreatment.
  • Another object of the invention is to provide a method of producing base assemblies for ignition distributors of automotive vehicles or the like by resorting to a process known as impact extrusion.
  • a further object of the .invention is to provide a method of the above outlined characteristics which may be practiced with the help of a comparatively simple and Iinexpensive apparat-us.
  • An additional object of the invention is to provide an improved base assembly which is produced in accordance with our method.
  • a concomitant object of the invention is to provide a method 4of producing base assemblies for ignition distributors according to which different materials may be combined to form an integral lunit so that each portion of the base assembly may consist of such material which is best suited for its intended purpose; for example, the bearing sleeve may consist of a material which is highly resistant to wear whereas the cup may consist of less resistant material.
  • Still another object of the present invention is to provide a method of producing base assemblies for ignition ldistributors in such a way that the bear-ing sleeve may be readily calibrated to take the drive shaft of the ignition distributor without any desirable play.
  • one feature of our invention resides in the provision of a method for the production of base assemblies for ignition distributors of the type wherein the base assembly comprises a cup and a bearing sleeve for the drive shaft of the ignition distributor.
  • the method comprises the steps of drawing a cupshaped metallic blank from a sheet of steel stock or the like so as to provide the bottom wall of the cup with a tubular extension, placing the extension into a female die having a cavity whose outline corresponds to the outf ice line of the bearing sleeve, introducing into the extension a solid cylindrical slug of aluminum or other malleable metallic material, and applying to the opposite axial ends of the slug a compressive force to deforrn and to thereby transform the slug into a cylindrical body which lls the cavity of the female die and forms with the extension an integral unit which constitutes the bearing sleeve of the thus obtained base assembly.
  • the extension with at least one slot, groove or a similar recess which is filled with the material of the slug whereby the cylindrical body is non-rotatably secured to the extension.
  • some material of the slug may be caused to form an annular collar which overlies the inner si-de of the bottom wall to prevent axial movement of the cylindrical body.
  • the punches which deform the slug to form a cylindrical body are preferably withdrawn at the time the cylindrical body has been provided with two blind bores which are separated by a radial partition or diaphragm. This partition is then drilled to be provided with a bore which is calibrated to accommodate the corresponding portion of the drive shaft or a bushing which surrounds the drive shaft.
  • FIG. 1 is an axial section through a portion of an extruding apparatus which is utilized for practicing the method ofour invention, the apparatus being shown in a position in which it is ready to begin the extruding operf ation.
  • FIG. 2 is a similar axial section but showing the component parts of the apparatus in the last sta-ge of the extruding operation;
  • FIG. 3 is an enlarged side elevational view of the base assembly as it appears upon removal from the extruding apparatus, a portion of the base assembly being shown in section;
  • FIG. 4 is a side elevational View of an ignition d-istributor which comprises a base assembly resembling the one shown in FIG. 3, a portion of the ignition distributor being shown in section.
  • FIG. 1 there is shown a portion of an apparatus for cold impact extrusion of base assemblies for ignition distributors of the type which may be used in the internal combustion engines of automotive vehicles and other types of conveyances.
  • the apparatus comprises a male die or base 10 which is provided with an axial bore 10a for a reciprocable punch 14.
  • the base 10 is provided with a cylindrical boss 10b whose axis coincides with the axis of the bore 10a and which rsupports a cup-shaped metallic blank 11.
  • the blank 11 has been prefabricated in a drawing machine by deformation of a sheet of steel stock or the like.
  • the bottom wall 11a of the blank is provided with a coaxial cylindrical extension 11 having at its free end one or more axially extending notches 11, see also FIG. 3.
  • the extension 11 projects into the cavity 13a of a female die 13 which is placed onto the outer side of the bottom wall 11a.
  • the cavity 13a has a larger-diameter outer portion which receives the extension 11 and a smaller-diameter inner portion whose outline corresponds to the desired outline of the corresponding part of the bearing sleeve.
  • a slug 12 of malleable metallic material is placed into the cavity 13a in such a way that it extends close to the top face of the boss 10b and that it also extends into the smaller-diameter inner portion of the cavity.
  • the female die 13 is further provided with a central bore 13b which receives a reciprocable punch 15.
  • the slug 12 may consist of a piece of solid cylindrical aluminum rod stock.
  • the punches 14, 15 are caused to move toward each other in the axial direction of the extension 11 whereby the slug 13 undergoes deformation and forms a cylinder 16, see FIG. 2, which fills the remainder of the cavity 13a and is automatically connected to the extension 11.
  • the material of the slugr 12 fills the slots 11, as at 16', and also because some of the impact-extruded malleable material forms a collar 16a which overlies the inner side of the bottom wall 11a whereby the cylinder 16 is held against axial and/or angular movement with reference to the extension 11.
  • the mass of the slug 12 is selected in such a way that the resulting cylinder 16 completely fills the cavity 13a, i.e., that portion of the cavity which is not lled by the front portions of the punches 14, 15 and the extension 11.
  • the punches 14, 15 are moved axially and away from each other, the 'base 10 is separated from the female die 13, and the thus obtained partially finished base assembly is removed from the cavity 13a, see FIG. 3. It will be noted that the punches 14, 15 leave in the cylinder 16 a Ishort radial partition or diaphragm 16" which extends between two blind bores 1617, 16e and is thereupon drilled and calibrated to form an accurate passage for the drive shaft 21 or for a bushing 18 of the ignition distributor, see FIG. 4.
  • the periphery of the cylinder 16 is then provided with a circumferential groove 17 and its axial bore receives two press-fitted bushings 18, 19 which are separated by a self-lubricating annular spacer 20.
  • the bushing 18 extends inwardly and beyond the bottom wall 11a to carry a cylindrical bearing 23 for an angularly adjustable breaker plate 24.
  • the plate 24 carries the bolt 25 of a primary distributor lever which is biased by a spring 26.
  • the upper end portion of the drive shaft 21 carries a rotor 27 and the lower end portion -of this drive shaft carries a coupling 28.
  • the open end of the cup 11 is closed by a cap 29 which is secured to the base assembly by a pair of cap clamp springs 31 (only one shown) which engage suitable projections 30 on the outer side of the cup 11.
  • the cap 29 normally consists of rigid synthetic plastic material.
  • a very important advantage of our improved method is that the base assembly of the ignition distributor may be produced at a very low cost and with utmost preciSion so that, once the impact extrusion of the slug 12 is completed, the base assembly is ready to be drilled and milled and to be thereupon assembled with the remaining component parts of the ignition distributor. Also, the manufacturing establishment need not include a casting plant and the manufacturer may dispense with costly and complicated conveyors which feed base assemblies in the form of gray iron castings when the base assemblies are produced in accordance with conventional methods.
  • a method of cold forming base assemblies for ignition distributors of the type wherein the base assembly includes a cup and a bearing sleeve for the drive shaft of the ignition distributor comprising the steps of drawing a sheet of metallic stock to form a cup-shaped blank with a bottom wall having a tubular extension; placing the extension into a female die wlhose cavity has an outline corresponding to the desired outline of the bearing sleeve; introducing into the extension a slug of malleable metallic material not completely filling said cavity; and applying to each axial end of the slug a compressive force acting in the axial direction of the extension to transform the slug into a hollow tubular body which fills the cavity and is simultaneously connected with said tubular extension to form therewith said base assembly.
  • a method of producing base assemblies for ignition distributors of the type wherein the base assembly includes a cup and a bearing sleeve for the drive shaft of the ignition distributor comprising the steps of drawing a sheet of metallic stock to form a cup-shaped blank with a bottom wall having an open-ended tubular extension; placing the extension into a portion of a female die the remainder of whose cavity has an outline corresponding to the desired outline of the bearing sleeve; introducing into the end of the extension and extending therefrom into the cavity, a slug of malleable metallic material; applying to the opposite ends of the slug a compressive force acting in the axial direction of the extension to transform the slug into a hollow substantially cylindrical body which fills the cavity and interlocks with the tubular extension and is provided with an internal diaphragm located in a plane which is perpendicular to the axis of the body; removing the thus obtained bearing sleeve from the cavity of the female die; and drilling a bore through the diaphragm to provide
  • a method of cold forming base assemblies for ignition distributors of the type wherein the base assembly includes a cup and a bearing sleeve for the drive shaft of the ignition distributor comprising the steps of drawing a sheet of metallic stock to form a cup-shaped blank with a bottom wall having a tubular extension; placing the extension into a female die whose cavity has an outline corresponding to the desired outline of the bearing sleeve; introducing into the extension a slug of malleable metallic material not completely filling said cavity; and applying to each axial end of the slug a compressive force acting in the axial direction of the extension to transform the slug into a hollow tubular body which fills the cavity and constitutes with the tubular extension the bearing sleeve of the thus obtained
  • a method of cold-forming base assemblies for ignition distributors of the type wherein the base assembly ir1- cludes a cup and a bearing sleeve for the drive shaft of the ignition distributor comprising the steps of drawing a sheet which consists of a first metallic material to form a cup-shaped blank with a bottom wall having a tubular extension; placing the extension into a female die whose cavity has an outline corresponding to the desired outline of the bearing sleeve; introducing into the extension a malleable slug of a second metallic material not completely tting said cavity; and applying to each axial end of the slug a compressive force acting in the axial direction of the extension to transform the slug into a hollow tubular body which fills the cavity and is simultaneously connected with said tubular extension to constitute therewith the bearing sleeve of the thus obtained base assembly.
  • the base assembly includes a cup and a bearing sleeve for the drive shaft of the ignition distributor, the steps of forming a cup-shaped metallic blank with an open-ended tubular extension which extends from the outer side of the bottom wall of the blank; inserting into the cup-shaped blank a portion of a male die and inserting the tubular extension into a portion of a female die the remainder of whose cavity has an outline corresponding to the desired outline of the bearing sleeve; introducing into one end of the tubular extension a cylindrical slug of malleable metallic material so that the slug partially extends into and lls the remainder of the cavity in the female die; driving through each of said dies a punch in the axial direction of the tubular extension so that the punches penetrate into the slug and deform the malleable material to fill the remainder of the mold cavity whereby the thus deformed slug and said tubular extension together constitute the bearing sleeve of the resulting

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US390973A 1963-08-31 1964-08-20 Method of producing base assemblies for ignition distributors Expired - Lifetime US3315333A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB73334A DE1281209B (de) 1963-08-31 1963-08-31 Verfahren zur Herstellung von Gehaeusen fuer Zuendverteiler von Brennkraftmaschinen

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US3315333A true US3315333A (en) 1967-04-25

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US390973A Expired - Lifetime US3315333A (en) 1963-08-31 1964-08-20 Method of producing base assemblies for ignition distributors

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US (1) US3315333A (de)
AT (1) AT259996B (de)
DE (1) DE1281209B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3442537A (en) * 1964-10-01 1969-05-06 Weatherhead Co Composite forged fitting of diverse metals
JPS5314043U (de) * 1976-07-19 1978-02-06
US4200217A (en) * 1976-08-06 1980-04-29 Hitachi, Ltd. Method of manufacturing an article having a press-worked member inwardly of a cylindrical member
US4295595A (en) * 1978-01-25 1981-10-20 Hitachi, Ltd. Method of producing magnetron anode

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2721101C2 (de) * 1977-05-11 1987-01-15 Robert Bosch Gmbh, 7000 Stuttgart Befestigungsanordnung für Kappen an Gehäusen von Zündverteilern

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US310846A (en) * 1885-01-13 Geoege dysolsr owen
US1165514A (en) * 1915-09-20 1915-12-28 George W Kelly Brake jaw or fork.
US2013411A (en) * 1932-06-04 1935-09-03 Westinghouse Lamp Co Pluro-metallic rod
US2804679A (en) * 1954-08-23 1957-09-03 Southwest Products Co Method of making bearings and rod end bearings
US2984001A (en) * 1955-11-04 1961-05-16 Lyon George Albert Method of forming sockets for drop rings
US3209437A (en) * 1962-04-13 1965-10-05 Voorhies Carl Method of securing together two members

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB507879A (de) * 1900-01-01
GB255472A (en) * 1925-07-16 1926-10-21 Gen Electric Improvements in or relating to ignition apparatus for internal combustion engines
GB803015A (en) * 1955-01-28 1958-10-15 Mini Of Supply Improvements in or relating to the manufacture of composite members by impact extrusion

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US310846A (en) * 1885-01-13 Geoege dysolsr owen
US1165514A (en) * 1915-09-20 1915-12-28 George W Kelly Brake jaw or fork.
US2013411A (en) * 1932-06-04 1935-09-03 Westinghouse Lamp Co Pluro-metallic rod
US2804679A (en) * 1954-08-23 1957-09-03 Southwest Products Co Method of making bearings and rod end bearings
US2984001A (en) * 1955-11-04 1961-05-16 Lyon George Albert Method of forming sockets for drop rings
US3209437A (en) * 1962-04-13 1965-10-05 Voorhies Carl Method of securing together two members

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3442537A (en) * 1964-10-01 1969-05-06 Weatherhead Co Composite forged fitting of diverse metals
JPS5314043U (de) * 1976-07-19 1978-02-06
US4200217A (en) * 1976-08-06 1980-04-29 Hitachi, Ltd. Method of manufacturing an article having a press-worked member inwardly of a cylindrical member
US4295595A (en) * 1978-01-25 1981-10-20 Hitachi, Ltd. Method of producing magnetron anode

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Publication number Publication date
DE1281209B (de) 1968-10-24
AT259996B (de) 1968-02-12

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