US1848083A - Method of forming valve tappets - Google Patents

Method of forming valve tappets Download PDF

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Publication number
US1848083A
US1848083A US38406729A US1848083A US 1848083 A US1848083 A US 1848083A US 38406729 A US38406729 A US 38406729A US 1848083 A US1848083 A US 1848083A
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US
Grant status
Grant
Patent type
Prior art keywords
tappet
die
base
metal
billet
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
Inventor
Charles E Wetherald
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/22Making metal-coated products; Making products from two or more metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00Making machine elements
    • B21K1/76Making machine elements elements not mentioned in one of the preceding groups
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49229Prime mover or fluid pump making
    • Y10T29/49298Poppet or I.C. engine valve or valve seat making
    • Y10T29/49307Composite or hollow valve stem or head making
    • Y10T29/49311Composite or hollow valve stem or head making including extruding
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49826Assembling or joining
    • Y10T29/49908Joining by deforming
    • Y10T29/49925Inward deformation of aperture or hollow body wall
    • Y10T29/49934Inward deformation of aperture or hollow body wall by axially applying force
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49826Assembling or joining
    • Y10T29/49908Joining by deforming
    • Y10T29/49936Surface interlocking

Description

Marh1,1932., EWETHERALD A1,848,083

METHOD OF FORMING VALVE TAPPETS Filed Aug. 7, 1929 W, A www,

Patented Mar. 1, 1932 UNrriaD STATES .PATENT OFFICE CHARLES E. WETHERALD, OE FLINT, MICHIGAN, vAssIGrNoR To GENERAL MOTORS CORPORATION, oF DETROIT, MICHIGAN, A CORPORATION or' DELAWARE METHOD F FQRMING VALVE TAIETS Application led August 7, 1929.' Serial No. 384,067.

This invention relates to valve tappets and more particularly to that type of tappet in which the base or cam-engaging face is formed of one kind of metal, while the stem .5 or shell portion is formed of a different kind of metal.

It has long been recognized that while it is necessary to make the tappet sufficiently large in diameter to provide a proper area of 10 bearing surface between the tappet and the in which the upper portion is in the form of a tubular shell and the cam-engaging face is of some suitable material which will withstand the wear caused by the action of the cams against such face.V

x It has been' found that chilled cast iron or certain alloy steels are ideal materials to be employed in the base of such a tappet, since they possess the proper hardness to withstand the constant impact of the cams. It is not necessary or even desirable that the shell portion be formed of the same material as the base, since'when chilled cast iron is used it would greatly increase the cost to chill the entire outersurface of the tappet,in stead of merely the cam-engaging face. Obviously when alloy .steels'are employed, the cost would be greatly increased .were the entire tappet made of such material. Consequently the practical thing to do is to form the shell of somecheaper material. To cast the shell is not entirely satisfactory since the wall thickness must necessarily be greater and this of course increases the weight which is objectionable. Also, the outside surface of the shell requires considerable machining when cast and if the inside surface is not machined there is a possibility of slightly different weights in/the various tappets, due to molding inaccuracies. If theshell be made in the usual manner from solid steel stock, then a large amount of machining is necessary to remove the material in the center.

5 l It is therefore an obj ectof this invention to motey smooth and quiet performance. F or this reason, an ideal type of tappet is one.

provide a tappetin which the shell portion is .Y formed of solid stock by the extrusion process. In this process a heated billet of metal is placed in a die anda plunger is forced under considerable pressure into the billet, causing the metal in the latter to low axially into the space between the plunger and the die, thusforming a tubular shell. At thevv saine time, part of the metalin thebillet is forced into engagement with a groove formed in a base member of chilled cast iron, alloy steelor some other. suitable material, which has previously been-placed inthe die. The resulting tappet requires no machining other than a slight grinding operation on its eX- terior surface to provide a `proper bearing surface, and all vsuch tappets are necessarily .of exactly the same weight due to the method employed in their manufacture. Such tappets may be produced very rapidly and con- 70 seliently their cost is comparatively low.

' ther -objectsand advantages will be apparent upon referring to the specification and Y accompanying drawings, in which:

Fig. 1 is a fragmentary ,sectional view 75 through the center of the dies employed in the manufacture/of my improved tappet, showing the base and the heated billet in the die beforethe act of extrusion has taken place. l A

Fig. 2 is a view similar to Fig. 1, but showing the lposition of the parts after the act of extrusion.

Fig. 3 is afragmentary vertical section through a portion of an internal combustion '85 engine, showing my improved tappetv assembled therein.

The reference numeral 10 indicatesa stationary die having an aperture 12 therein of the same diameter as that of the tappet to be produced. A movable support 14 fits into the lower end of the aperture -12 and is adapted to be moved up or' down by any suitable means. A plunger 16.01 the same diameter as that of the inside of the' finished tappet 95 is removably mountedin a movable member 18 adapted to be reciprocated by any suitable means which willfurnish suicient pressure to accomplish the act of extrusion to be described later.

The first step in the production of the tappet is to form a base or cam-engaging member 20 of chilled cast iron, alloy steel or other suitable material. An annular groove 22, preferably undercut, is formed in the base. This base is placed in the aperture 12 in such position that the cam engaging face abuts against the support 14, with the groove 22 on the upper side. A billet 24 of any suitable metal, such as ordinary steel, is heated to a temperature sufficiently high to permit the metal to flow when placed under pressure.

This heated billet is just enough smaller in diameter than the diameter of the aperture 12 to permit it to be inserted therein, on top of the base 20.

The plunger 16 is then forced under pressure into the billet, and, since the metal cannot flow radially, it must ow axially downward into the groove 22, and upwardly into the space between the plunger 16 and the die 10. Due to the fact that the metal in the billetl cannot flow radially, there is no possibility of cracks developing in the outer surface of the metal due to expansion. The thickness of the billet is so proportioned that when the plunger has reached the bottom of its stroke,'the metal will have flowed upwardly to such a point as will produce a shell 25 of the desired length. The plunger is then withdrawn, and the tappet is ejected from the die by causing the support 14 to be moved upwardly.

It may not be necessary that the groove 22 be undercut, since when certain combinations Of metals are employed, the upper corner of` the base tends to expand outwardly during the act of extrusion, and thereby serves to lock the base and shell together. In this case an ordinary straight groove in the base is all that need be provided.

After removalfrom the die the outside surface of the shell and the cam-engaging face are ground to provide a smooth surface. In Fig. 3 the tappet is shown assembledin an engine 26. The valve operating push rod 28 or valve stem, as the case may be, ts

into an aperture 30 drilled through the low-A a tappet in which a shell of suitable material is quickly and cheaply formed, and at the in a die, inserting a metal -billet in the die adjacent the base, and then forcing a plunger into said billet to simultaneously cause the metal in the billet to flow into interlocking engagement with said base and to flow into the space between the plunger and the die to form the billet into a tubular shell.

2. The method of forming a valve tappet which consists in placing a cam-engagingl member' having a groove formed therein in a die, inserting a heated metal billet adjacent said member, and then forcing a plunger into said billet to cause the metal in the latter to flow axially into the space betweenthe plunger and the die to form a tubular shell and at the same time to flow axially into the groove to interlock the shell 'with the cam-engaging member.

3. The method of forming a valve tappet which consists in placing a base having a groove formed therein in a die, inserting a heated metal billet in the die adjacent the base, and then forcing a plunger into the billet thereby extruding the metal into the space between the plunger and the die to form a .tubular shell and also into the groove to interlock the base to the shell. 4,.'fThe method of forminga valve tappet which consists in placing a cam-engaging member having an undercut annular groove formed therein in a die, inserting a heated metal billet in said die adjacent said member, and thenl forcing a plunger into said billet to cause the metal in the latter to flow axially into the space between the plunger and the die to form a tubular shell and at the same time to flow axially into the groove to interlock the cam-engaging member with the shell.

In testimony whereof I affix my signature.

CHARLES E. WETHERALD.

same time is interlocked with a base of some I,

material which will provide a proper camengaging face. The resulting tappet is very light in weight and yet provides a large amount of bearing area, thus preventing rapid wear'. Very little machining is necessary and consequently the ta pet may be produced very economically. bviously

US1848083A 1929-08-07 1929-08-07 Method of forming valve tappets Expired - Lifetime US1848083A (en)

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Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742018C (en) * 1937-05-27 1944-02-24 Siemens Ag Process for the production of components for electrical purposes
US2450803A (en) * 1942-01-24 1948-10-05 Thompson Prod Inc Method of making sheathed valves
US2621862A (en) * 1950-05-03 1952-12-16 Abbott Worsted Mills Inc Thread guide mechanism
US2810478A (en) * 1952-04-18 1957-10-22 Comptoir Ind Etirage Extrusion of hollow bodies
US2887098A (en) * 1954-07-29 1959-05-19 Earl A Thompson Valve tappet
US2891525A (en) * 1955-08-01 1959-06-23 Thompson Ramo Wooldridge Inc Tappet barrel
US2898666A (en) * 1952-03-05 1959-08-11 Olin Mathieson Method of making bullets
US2932290A (en) * 1957-12-27 1960-04-12 Harvey Machine Co Inc Low inertia valve lifter unit and method of making the same
DE1102847B (en) * 1954-12-07 1961-03-23 Alois Schiffmann Dipl Kfm A process for the manufacture of contact and corrosion-resistant metal Two power terminals
US2983991A (en) * 1956-02-23 1961-05-16 Chrysler Corp Valve tappet and method of making
US2988805A (en) * 1954-07-29 1961-06-20 Earl A Thompson Art of making a tappet
US3041718A (en) * 1957-10-18 1962-07-03 Metal Box Co Ltd Manufacture of aluminium containers
DE1134953B (en) * 1957-10-18 1962-08-23 Metal Box Co Ltd A process for producing a thin-walled metal container by Rueckwaertsfliesspressen
US3075817A (en) * 1961-02-28 1963-01-29 Harvey Aluminum Inc Reinforced light weight piston
US3149410A (en) * 1960-11-02 1964-09-22 Gen Motors Corp Valve lifter
US3198182A (en) * 1962-08-17 1965-08-03 Gen Motors Corp Valve lifter
US3209437A (en) * 1962-04-13 1965-10-05 Voorhies Carl Method of securing together two members
US3222761A (en) * 1957-11-29 1965-12-14 Arrowhead Eng Corp Process of forming cup-shaped articles
US3235946A (en) * 1957-11-18 1966-02-22 Star Machine Inc Process of fabricating piston heads for hydraulic brake cylinders
FR2373354A1 (en) * 1976-12-13 1978-07-07 Nippert Co bimetallic electrode welding resistance and its production method
FR2481620A1 (en) * 1980-05-03 1981-11-06 Alusuisse Process for manufacturing objects made of light metal by forming, in particular by extrusion and forging, and shaped part component made of light metal
FR2481621A1 (en) * 1980-05-03 1981-11-06 Alusuisse Method for manufacturing light metal objects by forming molded part and possessing a light metal component
FR2533076A1 (en) * 1982-09-13 1984-03-16 Duracell Int extruded case, its manufacture and use
US4608742A (en) * 1983-05-26 1986-09-02 Parker Hannifin Corporation Forged dissimilar metal assembly and method
US4780948A (en) * 1983-05-26 1988-11-01 Parker-Hannifin Corporation Forged dissimilar metal assembly and method
US4829950A (en) * 1986-04-30 1989-05-16 Hitachi, Ltd. Valve lifter and method of producing the same
US5914057A (en) * 1997-02-04 1999-06-22 The Nippert Company Resistance welding electrode and process for making
US6225591B1 (en) 1997-11-20 2001-05-01 The Nippert Company Resistance welding electrode and process for making
US6871622B2 (en) 2002-10-18 2005-03-29 Maclean-Fogg Company Leakdown plunger
US7028654B2 (en) 2002-10-18 2006-04-18 The Maclean-Fogg Company Metering socket
US7128034B2 (en) 2002-10-18 2006-10-31 Maclean-Fogg Company Valve lifter body
US7191745B2 (en) 2002-10-18 2007-03-20 Maclean-Fogg Company Valve operating assembly
US7273026B2 (en) 2002-10-18 2007-09-25 Maclean-Fogg Company Roller follower body

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742018C (en) * 1937-05-27 1944-02-24 Siemens Ag Process for the production of components for electrical purposes
US2450803A (en) * 1942-01-24 1948-10-05 Thompson Prod Inc Method of making sheathed valves
US2621862A (en) * 1950-05-03 1952-12-16 Abbott Worsted Mills Inc Thread guide mechanism
US2898666A (en) * 1952-03-05 1959-08-11 Olin Mathieson Method of making bullets
US2810478A (en) * 1952-04-18 1957-10-22 Comptoir Ind Etirage Extrusion of hollow bodies
US2887098A (en) * 1954-07-29 1959-05-19 Earl A Thompson Valve tappet
US2988805A (en) * 1954-07-29 1961-06-20 Earl A Thompson Art of making a tappet
DE1102847B (en) * 1954-12-07 1961-03-23 Alois Schiffmann Dipl Kfm A process for the manufacture of contact and corrosion-resistant metal Two power terminals
US2891525A (en) * 1955-08-01 1959-06-23 Thompson Ramo Wooldridge Inc Tappet barrel
US2983991A (en) * 1956-02-23 1961-05-16 Chrysler Corp Valve tappet and method of making
DE1134953B (en) * 1957-10-18 1962-08-23 Metal Box Co Ltd A process for producing a thin-walled metal container by Rueckwaertsfliesspressen
US3041718A (en) * 1957-10-18 1962-07-03 Metal Box Co Ltd Manufacture of aluminium containers
US3235946A (en) * 1957-11-18 1966-02-22 Star Machine Inc Process of fabricating piston heads for hydraulic brake cylinders
US3222761A (en) * 1957-11-29 1965-12-14 Arrowhead Eng Corp Process of forming cup-shaped articles
US2932290A (en) * 1957-12-27 1960-04-12 Harvey Machine Co Inc Low inertia valve lifter unit and method of making the same
US3149410A (en) * 1960-11-02 1964-09-22 Gen Motors Corp Valve lifter
US3075817A (en) * 1961-02-28 1963-01-29 Harvey Aluminum Inc Reinforced light weight piston
US3209437A (en) * 1962-04-13 1965-10-05 Voorhies Carl Method of securing together two members
US3198182A (en) * 1962-08-17 1965-08-03 Gen Motors Corp Valve lifter
FR2373354A1 (en) * 1976-12-13 1978-07-07 Nippert Co bimetallic electrode welding resistance and its production method
FR2481620A1 (en) * 1980-05-03 1981-11-06 Alusuisse Process for manufacturing objects made of light metal by forming, in particular by extrusion and forging, and shaped part component made of light metal
FR2481621A1 (en) * 1980-05-03 1981-11-06 Alusuisse Method for manufacturing light metal objects by forming molded part and possessing a light metal component
FR2533076A1 (en) * 1982-09-13 1984-03-16 Duracell Int extruded case, its manufacture and use
US4608742A (en) * 1983-05-26 1986-09-02 Parker Hannifin Corporation Forged dissimilar metal assembly and method
US4780948A (en) * 1983-05-26 1988-11-01 Parker-Hannifin Corporation Forged dissimilar metal assembly and method
US4829950A (en) * 1986-04-30 1989-05-16 Hitachi, Ltd. Valve lifter and method of producing the same
US5914057A (en) * 1997-02-04 1999-06-22 The Nippert Company Resistance welding electrode and process for making
USRE40265E1 (en) * 1997-02-04 2008-04-29 Luvata Ohio, Inc. Resistance welding electrode and process for making
US6225591B1 (en) 1997-11-20 2001-05-01 The Nippert Company Resistance welding electrode and process for making
US6871622B2 (en) 2002-10-18 2005-03-29 Maclean-Fogg Company Leakdown plunger
US7128034B2 (en) 2002-10-18 2006-10-31 Maclean-Fogg Company Valve lifter body
US7191745B2 (en) 2002-10-18 2007-03-20 Maclean-Fogg Company Valve operating assembly
US7273026B2 (en) 2002-10-18 2007-09-25 Maclean-Fogg Company Roller follower body
US7281329B2 (en) 2002-10-18 2007-10-16 Maclean-Fogg Company Method for fabricating a roller follower assembly
US7284520B2 (en) 2002-10-18 2007-10-23 Maclean-Fogg Company Valve lifter body and method of manufacture
US7028654B2 (en) 2002-10-18 2006-04-18 The Maclean-Fogg Company Metering socket

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