US1845311A - Method of forming tappets - Google Patents

Method of forming tappets Download PDF

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Publication number
US1845311A
US1845311A US289887A US28988728A US1845311A US 1845311 A US1845311 A US 1845311A US 289887 A US289887 A US 289887A US 28988728 A US28988728 A US 28988728A US 1845311 A US1845311 A US 1845311A
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US
United States
Prior art keywords
forming
tappets
blank
core
tappet
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
US289887A
Inventor
Charles B Mcdonald
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WILCOX PRODUCTS Corp
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WILCOX PRODUCTS CORP
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Publication date
Application filed by WILCOX PRODUCTS CORP filed Critical WILCOX PRODUCTS CORP
Priority to US289887A priority Critical patent/US1845311A/en
Application granted granted Critical
Publication of US1845311A publication Critical patent/US1845311A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
    • B23P15/002—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings poppet valves
    • 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
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49298—Poppet or I.C. engine valve or valve seat making
    • Y10T29/49304—Valve tappet 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
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49298—Poppet or I.C. engine valve or valve seat making
    • Y10T29/49307—Composite or hollow valve stem or head making
    • Y10T29/49313—Composite or hollow valve stem or head making including casting

Definitions

  • the object of the invention to obtain a construction in which all of the wearing surfaces are formed of chilled cast iron but which at the same time is provided with a soft core that may be bored and threaded for receiving the adjusting screw.
  • the invention consists in the process and product as hereinafter set forth.
  • FIG. 1 A is a blank having a portion B which corresponds to the for of the tappet together with a sprue portion C and a portion D intermediate portions B and C which is of smaller diameter.
  • This blank is cast in a chill, the metal being fed into the portion B from the sprue portion so as to compensate for shrinkage and to obtain the required density in the full length of the portion B.
  • the chill will impart to the surface portions of the metal adjacent thereto a great degree of hardness but the hardening elfect does not extend into the central core. If, however, the blank were only of a length equal to the finished tappet its end portions as well as its sides would be hardened and it would be impossible to drill or machine the core.
  • FIG. 2 The construction shown in Figure 2 is the same as that shown in Figure 1 with the exception that an enlarged head F is formed to constitute the cam follower.
  • This head is integral with the cylindrical portion for engaging the bearing, and a groove G is preferably formed between these portions to facilitate the grinding of the cylinder.
  • the method of forming tappets which consists in casting a chilled blank of a length greater than the finished tappet, severing a portion of said length to expose the end of the soft core and in then machining a socket in said core.
  • the method of forming tappets which consists in casting a chilled blank of greater length than the finished tappet provided with a sprue portion for supplying the metal compensating for shrinkage, in severing said sprue portion to expose the end of a soft core in the remaining portion and in machining said core to form a socket therein.
  • the method of forming tappets which consists in casting a chilled blank with a soft core, exposing the soft core atone end of the blank, and in then machining a. socket in said core.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Description

Feb. 16, 1932. c. B. MCDONALD 1,845,311
METHOD OF FORMING TAPPETS Filed July 2, 1928 jumu.
amuenfoz Patented Feb. 16, 1932 UNETED STATES "PATENT OFFICE CHARLES B. MCDONALD, 013 DETROIT, MICHIGAN, ASSIGNOR TO WILGOX PRODUCTS COR- PORATION, F DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN METHOD OF FORMING TAPPETS Application filed July 2., 1928. Serial No. 289,887.
to obtain hardened surfaces for engaging the cam and also the bearing in which the tappet reciprocates. It has also been found that chilled cast iron is a desirable material for forming such surfaces. However, it is also necessary to form a threaded socket for receivin the adjusting screws. Chilled cast iron is too hard to permit of machining and therefore it is usual to construct the tappet or the portion thereof in which the threaded socket is formed, of metal sufficiently soft for machining.
It is the object of the invention to obtain a construction in which all of the wearing surfaces are formed of chilled cast iron but which at the same time is provided with a soft core that may be bored and threaded for receiving the adjusting screw. To this end the invention consists in the process and product as hereinafter set forth.
As shown in Figure 1 A is a blank having a portion B which corresponds to the for of the tappet together with a sprue portion C and a portion D intermediate portions B and C which is of smaller diameter. This blank is cast in a chill, the metal being fed into the portion B from the sprue portion so as to compensate for shrinkage and to obtain the required density in the full length of the portion B. The chill will impart to the surface portions of the metal adjacent thereto a great degree of hardness but the hardening elfect does not extend into the central core. If, however, the blank were only of a length equal to the finished tappet its end portions as well as its sides would be hardened and it would be impossible to drill or machine the core. This diliiculty I have avoided by providing the extended sprue portion together with the contracted portion D which permits of breaking off the sprue thereby exposing the soft core. Thus to finish the tappet it is only necessary to drill and thread as indicated at E. I
The construction shown in Figure 2 is the same as that shown in Figure 1 with the exception that an enlarged head F is formed to constitute the cam follower. This head is integral with the cylindrical portion for engaging the bearing, and a groove G is preferably formed between these portions to facilitate the grinding of the cylinder.
What I claim as my invention is:
1. The method of forming tappets which consists in casting a chilled blank of a length greater than the finished tappet, severing a portion of said length to expose the end of the soft core and in then machining a socket in said core.
2. The method of forming tappets which consists in casting a chilled blank of greater length than the finished tappet provided with a sprue portion for supplying the metal compensating for shrinkage, in severing said sprue portion to expose the end of a soft core in the remaining portion and in machining said core to form a socket therein.
3. The method of forming tappets which consists incasting a chilled blank of a length greater than that of the finished tappet, the
extra length forming a sprue portion and a contracted portion intermediate said sprue portion and the tappet proper, in severing the blank in the plane of said contracted portion to expose the end of a soft core and in machining to form a socket in said core.
4. The method of forming tappets which consists in casting a chilled blank with a soft core, exposing the soft core atone end of the blank, and in then machining a. socket in said core.
5. The method of forming a tappet which consists in casting a chilled blank with a soft core, cutting the said blank to expose the soft core at one end of the blank, and'in then forming a socket in said core through the exposed portion thereof.
In testimony whereof I aflix my signature.
CHARLES B. MCDONALD.
US289887A 1928-07-02 1928-07-02 Method of forming tappets Expired - Lifetime US1845311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US289887A US1845311A (en) 1928-07-02 1928-07-02 Method of forming tappets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US289887A US1845311A (en) 1928-07-02 1928-07-02 Method of forming tappets

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US1845311A true US1845311A (en) 1932-02-16

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