EP1353044A2 - Method of manufacturing a poppet valve - Google Patents

Method of manufacturing a poppet valve Download PDF

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Publication number
EP1353044A2
EP1353044A2 EP02025596A EP02025596A EP1353044A2 EP 1353044 A2 EP1353044 A2 EP 1353044A2 EP 02025596 A EP02025596 A EP 02025596A EP 02025596 A EP02025596 A EP 02025596A EP 1353044 A2 EP1353044 A2 EP 1353044A2
Authority
EP
European Patent Office
Prior art keywords
valve
valve stem
bore
valve head
engagement portion
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.)
Withdrawn
Application number
EP02025596A
Other languages
German (de)
English (en)
French (fr)
Inventor
Tatsuo Fuji Oozx Inc. Kanazaki
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 EP1353044A2 publication Critical patent/EP1353044A2/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B21K1/22—Making machine elements valve parts poppet valves, e.g. for internal-combustion engines
    • 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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • 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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials

Definitions

  • the present invention relates to a method of manufacturing a poppet valve.
  • a poppet valve that consists of a valve stem and a valve head at the lower end of the valve stem is generally manufactured according to four methods as below:
  • the number of molding steps is too many to lead low productivity, and defective products are likely to be made owing to poor cold-forging capability in general heat-resistant steels.
  • valve stem and the valve head are integrally molded, and it is impossible to employ different materials depending on use.
  • a method of manufacturing a poppet valve comprising the steps of making a valve stem and a valve head separately, one of the valve stem and the valve head having an engagement portion that has an annular groove on an outer circumferential surface, the other having a bore; engaging the engagement portion with the bore; and pressing a circumferential wall of the bore from an outside toward an axis of the valve stem to deform it plastically so as to join the valve stem to the valve head integrally.
  • Fig. 1 is a partially cut-away front view of the first embodiment of a poppet valve 1 according to the present invention.
  • the poppet valve 1 comprises a valve stem 2 and a valve head 3 which are joined to each other as below.
  • annular groove 4 As shown in Fig. 2, on the outer circumferential surface of the lower end of the valve stem 2 which a cylindrical material is cut out to form, an annular groove 4 which becomes deeper upwards is formed.
  • the annular groove 4 is formed on an engagement portion 2a.
  • a bore 5 that has internal diameter and depth enough to be engaged with the engagement portion 2 is formed.
  • the engagement portion 2a of the valve stem 2 is engaged in the bore 5 of the valve head 3. Then, as shown in Fig. 4, the valve head 3 is positioned on a press device (not shown). Thereafter, the valve stem 2 is inserted into a pressing jig 7 which has an axial hole 6 which has an enlarged portion 6a at the lower end.
  • FIGs. 5 and 6 illustrate the second embodiment of the present invention.
  • An annular groove 9 having equal depth is formed on the outer circumferential surface at the lower portion of the valve stem 2, and the circumferential wall 8 at the upper end of the valve head 3 is strongly pressed by a pair of pressing rollers 10,10 each of which rotates in the same direction around a vertical axis, so that it is plastically deformed towards a vertical axis of the valve stem 2.
  • the circumferential wall 8 is put into the annular groove 9 and caulked.
  • valve stem 2 is joined to the valve head 3.
  • the annular groove 9 of the valve stem 2 increases unfastening resistance to tensile load compared with the first embodiment.
  • the annular groove 9 may be formed to be concave.
  • Figs. 7 and 8 illustrate the third embodiment of the present invention.
  • a bore 11 is formed at the lower portion of a valve stem 2, and an engagement portion 12 is provided at the upper portion of the valve head 3.
  • An annular groove 13 is formed to be concave0.
  • the engagement portion 12 is inserted in the bore 11, and the outer circumferential surface of a circumferential wall 14 including the bore 11 is strongly pressed towards a vertical axis of the valve stem 2 by a pair of pressing rollers 10 similar to the above, so that the valve stem 2 is joined to the valve head 3.
  • the annular groove 13 may be formed as the same shape as above.
  • valve stem 2 and the valve head 3 are separately made, and the ends of them are engaged with each other.
  • the circumferential walls 8, 14 of the engagement bores 5,11 of the valve head 3 or the valve stem 2 are plastically deformed towards an axis of a valve stem 2, so that the valve stem 2 is integrally formed with the valve head 3, thereby facilitating manufacturing of the poppet valve 1.
  • valve stem 2 may be made of low-cost material such as carbon steel or alloy steel for mechanical structure, and the valve head 3 may be made of heat-resistant steel, thereby decreasing total cost.
  • the valve stem 2 may be made of low-density material such as Al alloy, Ti alloy or Mg alloy to lighten the poppet valve 1.
  • valve stem 2 and the valve head 3 are separately formed.
  • a poppet valve having different diameter of the valve head may be made or different diameter of the valve stem can be easily made. Even if they are made of different materials such as heat-resistant steel and Al alloy that are difficult to weld owing to difference in melting points, they can be easily joined.
  • the valve head 3 can be molded by cold forging that provides high accuracy in size to omit later working to decrease cost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forging (AREA)
  • Lift Valve (AREA)
EP02025596A 2002-04-09 2002-11-18 Method of manufacturing a poppet valve Withdrawn EP1353044A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002105899 2002-04-09
JP2002105899A JP2003305524A (ja) 2002-04-09 2002-04-09 エンジンバルブの製造方法

Publications (1)

Publication Number Publication Date
EP1353044A2 true EP1353044A2 (en) 2003-10-15

Family

ID=28449915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02025596A Withdrawn EP1353044A2 (en) 2002-04-09 2002-11-18 Method of manufacturing a poppet valve

Country Status (4)

Country Link
EP (1) EP1353044A2 (zh)
JP (1) JP2003305524A (zh)
KR (1) KR20030080982A (zh)
CN (1) CN1450288A (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3882438A4 (en) * 2018-11-12 2021-11-24 Nittan Valve Co., Ltd. METHOD OF MANUFACTURING AN MOTOR DISC VALVE
US11300018B2 (en) 2018-03-20 2022-04-12 Nittan Valve Co., Ltd. Hollow exhaust poppet valve
US11850690B2 (en) 2020-03-30 2023-12-26 Nittan Corporation Method for manufacturing engine poppet valve

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0913576B1 (pt) * 2008-06-06 2021-05-11 Flowserve Management Company conjunto de plugue e método para substituir ou unir uma cabeça do plugue a uma haste do plugue
JP4526097B1 (ja) * 2009-12-24 2010-08-18 株式会社 吉村カンパニー 中空エンジンバルブの弁傘部の製造方法及び中空エンジンバルブの弁傘部のプレス装置及び中空エンジンバルブ
JP6109945B2 (ja) * 2013-09-11 2017-04-05 日鍛バルブ株式会社 エンジンバルブ及びエンジンバルブの製造方法
JP6752408B2 (ja) * 2015-06-18 2020-09-09 株式会社ニチリン 継手と支持部材との接合構造およびその製造方法
DE102015220891A1 (de) * 2015-10-26 2017-04-27 Federal-Mogul Valvetrain Gmbh Innengekühltes Ventil für Verbrennungsmotoren sowie Verfahren und Vorrichtung zu dessen Herstellung
KR101644132B1 (ko) 2016-02-02 2016-07-29 정원금속 주식회사 배기가스 재순환장치용 포핏밸브 제조방법
CN110842516B (zh) * 2019-11-20 2021-07-13 四川航天长征装备制造有限公司 一种加注阀门的收口工装及收口方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11300018B2 (en) 2018-03-20 2022-04-12 Nittan Valve Co., Ltd. Hollow exhaust poppet valve
EP3882438A4 (en) * 2018-11-12 2021-11-24 Nittan Valve Co., Ltd. METHOD OF MANUFACTURING AN MOTOR DISC VALVE
US11536167B2 (en) 2018-11-12 2022-12-27 Nittan Valve Co., Ltd. Method for manufacturing engine poppet valve
US11850690B2 (en) 2020-03-30 2023-12-26 Nittan Corporation Method for manufacturing engine poppet valve

Also Published As

Publication number Publication date
KR20030080982A (ko) 2003-10-17
JP2003305524A (ja) 2003-10-28
CN1450288A (zh) 2003-10-22

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