GB944894A - Internal combustion engine valve tappets and their manufacture - Google Patents

Internal combustion engine valve tappets and their manufacture

Info

Publication number
GB944894A
GB944894A GB1717262A GB1717262A GB944894A GB 944894 A GB944894 A GB 944894A GB 1717262 A GB1717262 A GB 1717262A GB 1717262 A GB1717262 A GB 1717262A GB 944894 A GB944894 A GB 944894A
Authority
GB
United Kingdom
Prior art keywords
coating
alloy
tappet
briquette
wear
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
Application number
GB1717262A
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
Application filed by Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of GB944894A publication Critical patent/GB944894A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • 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
    • B21K1/20—Making machine elements valve parts

Landscapes

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

Abstract

<PICT:0944894/C3/1> A valve tappet comprises a ferrous metal tubular body 10, Fig. 5, closed at one end 12 to form a base having a recessed portion surrounded by a peripheral ridge and a wear-resistant ferrous metal alloy coating 24 within the recess and fused to the base. The valve body is formed by upsetting or extrusion from a low carbon steel, e.g. containing carbon, manganese, phosphorous and sulphur or from a non-hardening stainless steel containing carbon and chromium. The wear resistant alloy containing carbon, molybdenum, tungsten and silicon or in addition chromium is pressed into a briquette 32, Fig. 4, which may be sintered before the fusion operation. A borax flux may be applied to the briquette or a calcium, aluminium or sodium flux is incorporated into the briquette material before forming. An induction heating coil 22 fuses the metals in a nitrogen atmosphere to form a coating alloy and the carbon and silicon constituents diffuse into the valve tappet base metal to form a diffusion bond and a carburized layer 34 is formed to provide support for the coating. A cooling water jet 36 promotes directional solidification of the coating alloy outwardly from the interface between the cooling and the end face of the tappet. The tappet may be subsequently carburized to provide a wear-resistant coating.
GB1717262A 1961-06-05 1962-05-04 Internal combustion engine valve tappets and their manufacture Expired GB944894A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11469761A 1961-06-05 1961-06-05
US11469861A 1961-06-05 1961-06-05

Publications (1)

Publication Number Publication Date
GB944894A true GB944894A (en) 1963-12-18

Family

ID=26812464

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1717262A Expired GB944894A (en) 1961-06-05 1962-05-04 Internal combustion engine valve tappets and their manufacture

Country Status (1)

Country Link
GB (1) GB944894A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138914A (en) * 1983-04-26 1984-10-31 Ford Motor Co Tappet
US4485770A (en) * 1980-12-24 1984-12-04 Honda Giken Kogyo Kabushiki Kaisha Material for valve-actuating mechanism of internal combustion engine
WO2008005384A2 (en) * 2006-06-30 2008-01-10 Caterpillar Inc Tappet assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4485770A (en) * 1980-12-24 1984-12-04 Honda Giken Kogyo Kabushiki Kaisha Material for valve-actuating mechanism of internal combustion engine
GB2138914A (en) * 1983-04-26 1984-10-31 Ford Motor Co Tappet
WO2008005384A2 (en) * 2006-06-30 2008-01-10 Caterpillar Inc Tappet assembly
WO2008005384A3 (en) * 2006-06-30 2008-02-28 Caterpillar Inc Tappet assembly
US7748359B2 (en) 2006-06-30 2010-07-06 Caterpillar Inc. Tappet assembly

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