[go: up one dir, main page]

EP0698727B1 - Un poussoir pour moteur à combustion interne - Google Patents

Un poussoir pour moteur à combustion interne Download PDF

Info

Publication number
EP0698727B1
EP0698727B1 EP95810122A EP95810122A EP0698727B1 EP 0698727 B1 EP0698727 B1 EP 0698727B1 EP 95810122 A EP95810122 A EP 95810122A EP 95810122 A EP95810122 A EP 95810122A EP 0698727 B1 EP0698727 B1 EP 0698727B1
Authority
EP
European Patent Office
Prior art keywords
tappet
internal combustion
combustion engine
lower ends
punch
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
EP95810122A
Other languages
German (de)
English (en)
Other versions
EP0698727A1 (fr
Inventor
Masahito c/o Fuji Oozx Inc. Hirose
Kazufumi c/o Fuji Oozx Inc. Nakamura
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.)
Fuji Oozx Inc
Original Assignee
Fuji Oozx Inc
Fuji Valve Co Ltd
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 Fuji Oozx Inc, Fuji Valve Co Ltd filed Critical Fuji Oozx Inc
Publication of EP0698727A1 publication Critical patent/EP0698727A1/fr
Application granted granted Critical
Publication of EP0698727B1 publication Critical patent/EP0698727B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B22F3/1103—Making porous workpieces or articles with particular physical characteristics
    • B22F3/1109—Inhomogenous pore distribution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • 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
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • 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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements

Definitions

  • the present invention relates to a tappet for use in a direct acting type valve operating mechanism for an internal combustion engine, and in particular, to a tappet in which the density at the upper and lower ends to which larger stress act is increased, thereby improving strength and wear resistance.
  • a direct acting type valve operating mechanism in an internal combustion engine is generally constructed as shown in Fig. 2.
  • a guide bore 2 formed in a cylinder head 1 there is provided a roughly H-sectioned tappet 3 having a circumferential wall 3a and a disc-shaped top wall 3b, the tappet being slidable in an axial direction of the bore 2.
  • a stem 4a of an engine valve 4 In the center of the circumferential wall 3a of the tappet 3, there is provided a stem 4a of an engine valve 4, the axial end of the stem 4a being engaged with the middle of the lower surface of the top wall 3b.
  • a spring receiver 5 is engaged via a pair of cotters 6, and an engine valve 4 is energised upwards by a valve spring 7 under the lower surface of the spring receiver 5 in the cylinder head 1.
  • a disc-shaped shim 8 is provided in a recess on the upper surface of the upper wall 3b, and a rotary cam 9 contacts the upper surface of the shim 8.
  • the foregoing tappet 3 is generally formed by cold forging of soft steel such as low carbon steel. Deviated load “F” acts to the tappet 3 at the beginning of pressing by the rotary cam 9, and by bending moment, the upper and lower ends of the tappet are subjected to larger stress “F1” and “F2” which act horizontally by the cylinder head 1. The upper and lower ends of the tappets need high compressive strength and wear resistance.
  • EP-A-0399400 describes a process for manufacturing a sintered metallic product, this process comprising the following steps :
  • the objective of this process is to manufacture a tappet which is not subject to internal tensile stresses. This document is not relied upon the afore mentioned disadvantage.
  • the application JP-A-58 107 401 describes an apparatus for powder molding in which the dimensional preciseness is maintained after sintering.
  • the objective of this invention is different from the objective of the present application.
  • a tappet for use in an internal combustion engine of a vehicle, said tappet being manufactured by compressing powdered metal by upper and lower punches and sintering it, said tappet comprising a top wall and a body, said tappet having higher density at said top wall and upper and lower ends of said body, and lower density at an intermediate portion between said upper and lower ends of said body, thereby improving strength and wear resistance.
  • the intermediate portion of the body has lower density or larger porosity, thereby increasing oil-having capability and increasing wear resistance thereof.
  • Fig. 1 is a schematic sectional view which shows main part of a compression molding machine for carrying out the present invention.
  • a cavity 22 which has an inner diameter corresponding to an outer diameter of a tappet to be molded, and a lower punch 23 is slidably inserted in axial direction.
  • a smaller diameter portion 24 At the upper end of the lower punch 23, there is provided a smaller diameter portion 24 to form a cylindrical body of the tappet.
  • An upper punch 25 on the die 21 has a diameter equal to and the same axis as the lower punch 23, and moves in an axial direction between a position which is spaced from the die 21 up wards and a position where it is fitted in the cavity 22.
  • a smaller diameter portion 26 At the lower end of the upper punch 25, there is provided a smaller diameter portion 26 to form a recess in which a shim fits.
  • the lower punch 23 goes down to a predetermined height in the cavity 22, and the upper punch 25 goes up.
  • a required amount of powdered metal "P" is filled into the cavity 22 on the smaller diameter portion 24 of the lower punch 23.
  • the upper punch 25 goes down, while the lower punch 23 goes up to compress the powdered metal "P" so that compressed powdered metal which has nearly the same form as the tappet to be manufactured is molded in a space formed by the wall of the cavity 22, by the upper end 24 of the lower punch 23 and by the lower end 26 of the upper punch 25.
  • the molded compressed powder 27 After the molded compressed powder 27 is pulled out of the die 21, it is sintered to form a tappet having higher density at the upper and lower ends of the body 27b, thereby increasing strength and wear resistance of the upper and lower ends of the tappet to which higher stress acts during operation of an engine.
  • the smaller diameter portion 26 is projected on the lower end of the upper punch 25, but a flat surface may be formed at the lower end of the upper punch 25 to provide a tappet having no such recess.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Powder Metallurgy (AREA)

Claims (1)

  1. Un poussoir (27) destiné à être utilisé dans un moteur à combustion interne d'un véhicule, ledit poussoir (27) étant fabriqué en compressant du métal pulvérisé (P) au moyen de poinçons inférieur et supérieur (23, 25) et en le frittant, ledit poussoir (27) comportant une paroi supérieure (27a) et un corps (27b), ledit poussoir ayant une densité plus élevée dans ladite paroi supérieure (27a) et aux extrémités inférieure et supérieure dudit corps (27b) et une densité plus faible dans une partie intermédiaire entre lesdites extrémités inférieure et supérieure dudit corps (27b), améliorant par ce moyen sa solidité et sa résistance à l'usure.
EP95810122A 1994-08-24 1995-02-24 Un poussoir pour moteur à combustion interne Expired - Lifetime EP0698727B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6199547A JPH0860205A (ja) 1994-08-24 1994-08-24 内燃機関用タペットの製造方法
JP199547/94 1994-08-24

Publications (2)

Publication Number Publication Date
EP0698727A1 EP0698727A1 (fr) 1996-02-28
EP0698727B1 true EP0698727B1 (fr) 1998-05-06

Family

ID=16409647

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95810122A Expired - Lifetime EP0698727B1 (fr) 1994-08-24 1995-02-24 Un poussoir pour moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP0698727B1 (fr)
JP (1) JPH0860205A (fr)
DE (1) DE69502363T2 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802849A (en) * 1969-01-31 1974-04-09 Toyoda Chuo Kenkyusho Kk Method for making a sintered body having integral portions of different density
US4251273A (en) * 1979-03-02 1981-02-17 Smith David T Method of forming valve lifters
JPS58107401A (ja) * 1981-12-18 1983-06-27 Mitsubishi Metal Corp 粉末成形装置
JPH0223214A (ja) * 1988-07-12 1990-01-25 Teikoku Piston Ring Co Ltd バルブリフタ及びその製造方法
IT1233589B (it) * 1989-05-26 1992-04-06 Fiat Ricerche Procedimento per realizzare un manufatto metallico sinterizzato e manufatto cosi ottenuto

Also Published As

Publication number Publication date
DE69502363D1 (de) 1998-06-10
DE69502363T2 (de) 1999-01-07
EP0698727A1 (fr) 1996-02-28
JPH0860205A (ja) 1996-03-05

Similar Documents

Publication Publication Date Title
US4472350A (en) Method of making a compound valve seat
JPH0472613B2 (fr)
US5609128A (en) Tappet in an internal combustion engine and a method of manufacturing it
EP0698727B1 (fr) Un poussoir pour moteur à combustion interne
US8510942B2 (en) Camshaft lobe and method of making same
JPH09276976A (ja) 組立カムシャフト用カムピースの製造方法及びそれに用いる熱間鍛造金型
EP0839991B1 (fr) Procédé de fabrication d'un poussoir de soupape de moteur à combustion interne
JPH08109809A (ja) 組立用カムロブの製造方法
PL188810B1 (pl) Sposób wytwarzania mechanicznego popychacza zaworu
US5724734A (en) Method of forming a tappet in an internal combustion engine
JPH07269312A (ja) 内燃機関のタペット用シム及びその製造方法
JP3709786B2 (ja) 突起付き中空軸の製造方法
EP0617198B1 (fr) Structure de cale pour utilisation dans un poussoir de soupape de moteur à combustion interne
JP3763796B2 (ja) 同軸度精度に優れた内孔付き焼結部材の製造方法
JPH09166003A (ja) 内燃機関用タペット及びその製造方法
EP0750955A1 (fr) Procédé de formation d'une soupape ayant une section à diamètre réduit
JPH0874525A (ja) 内燃機関用タペット及びその製造方法
JP3362241B2 (ja) エンジンバルブの製造方法
US5706772A (en) Tappet in an internal combustion engine and a method of manufacturing the tappet
JPH1061417A (ja) 内燃機関用バルブガイドの製造方法
JP3763797B2 (ja) 内外周の同軸度精度に優れた内孔付き焼結部材の製造方法
CN1139745A (zh) 模锻阀杆上设有直径更小部分的提升阀的方法
US5946800A (en) Method for producing rocker arms
JP3939671B2 (ja) 三次元カムの製造方法および粉末成形装置
EP0841472A1 (fr) Poussoir de soupape pour moteur à combustion interne et méthode de fabrication

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19960801

17Q First examination report despatched

Effective date: 19961118

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 69502363

Country of ref document: DE

Date of ref document: 19980610

ITF It: translation for a ep patent filed
ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19990223

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001031

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20010220

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20010328

Year of fee payment: 7

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020224

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020903

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20020224

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050224