EP0806549B1 - Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren - Google Patents

Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren Download PDF

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Publication number
EP0806549B1
EP0806549B1 EP19960303151 EP96303151A EP0806549B1 EP 0806549 B1 EP0806549 B1 EP 0806549B1 EP 19960303151 EP19960303151 EP 19960303151 EP 96303151 A EP96303151 A EP 96303151A EP 0806549 B1 EP0806549 B1 EP 0806549B1
Authority
EP
European Patent Office
Prior art keywords
outer circumferential
core material
circumferential surface
helical groove
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
EP19960303151
Other languages
English (en)
French (fr)
Other versions
EP0806549A1 (de
Inventor
Nuobo Hara
Tatsuo Kanzaki
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
Priority to DE1996613959 priority Critical patent/DE69613959T2/de
Priority to EP00200571A priority patent/EP1004753B1/de
Priority to EP19960303151 priority patent/EP0806549B1/de
Publication of EP0806549A1 publication Critical patent/EP0806549A1/de
Application granted granted Critical
Publication of EP0806549B1 publication Critical patent/EP0806549B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01L1/143—Tappets; Push rods for use with overhead camshafts

Definitions

  • the present invention relates to a tappet in an international combustion engine and a method of manufacturing it.
  • a helical groove 13 is formed on the outer circumferential surface of raw material for a tappet to make a core material 15, the surface of which is thermally sprayed by wear resistant material such as Fe metal to form a coating layer 17 which covers the helical groove 13.
  • the outer circumferential surface of the coating layer is ground to form a cylindrical portion 18, the end 19 of which is chamfered.
  • the cylindrical wear resistant coating layer 17 in which the groove 13 of the core material 15 is embedded is slightly left as a fine string-like portion 16, which is likely to peel off as small pieces.
  • US-A-4,909,198 discloses a valve lifter having an Al-Si alloy body with an Fe-C coating sprayed on a cylindrical portion of the body, which is formed with keying grooves to receive part of the spray coating.
  • the helical groove gradually may become smaller in diameter toward the end in the vicinity of the end of the core material, thereby preventing the helical groove from being exposed over the coating layer even if the upper and lower ends of the coating layer are chamfered.
  • the end of the helical groove is stopped before the end of the core material, and is connected with the annular groove, thereby preventing removal even if the chamfered portion is exposed owing to corrosion.
  • the tappet according to the present invention comprises the core material in which the helical groove is formed on the outer circumferential surface, and the wear resistant coating layer with which the outer circumferential surface is covered and the ends are chamfered, thereby providing a light weight body and relatively small inertia force, so that response and followability to reciprocal movement is improved. Furthermore, owing to wear resistance in frictional portion, durability will increase.
  • the groove of the core material is completely covered with the coating layer other than upper and lower ends, thereby avoiding thinner string portions as in conventional ones and removal thereof.
  • metal thermal spraying it is suggested that the core material is immersed in melted metal, or plating is applied, but metal thermal spraying is more convenient and economical.
  • a cylindrical raw material 1 of light metal such as Al as shown in Fig. 1 is rotated on an axis , while a cutting tool contacts the outer circumferential surface 2. Feed is axially given by the cutting tool to form a helical groove 3 on the outer circumferential surface of the raw material 1. At the same time, adjacent to the raw material 1, additional feed is given to the cutting tool toward the axis so that the helical groove 3 gradually decreases in diameter toward the end of the raw material 1.
  • Fig. 6 illustrates the second embodiment of a tappet according to the present invention.
  • feeds are given to the cutting tool in an axial direction and toward the axis, and the raw material 1 is immediately ground to the end thereof without stopping the feeds at near the end of the material 1, so that the helical groove 3 is formed all over the outer circumferential surface 1, and similar way to the first embodiment is then made.
  • the peaks 10 in the helical groove 3 of the material 5 are not exposed over the outer circumferential surface 8 of the coating layer 7.
  • the same numerals are alotted to the same members and parts in the first embodiment, and the details thereof are omitted.
  • Fig. 7 illustrates the third embodiment of a tappet according to the present invention.
  • feed is given to the cutting tool only in an axial direction, not toward the axis, so that the raw material is ground.
  • feed of the cutting tool is stopped, and terminates at a position slightly spaced from the end of the material 1. thereby forming a helical groove 3 having an annular groove 3a at the terminating end then a tappet is made by a way similar to the first embodiment.

Landscapes

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

Claims (4)

  1. Ventilstössel einer Brennkraftmaschine, umfassend einen Kern (5) mit einer schraubenförmigen Nut (3) auf seiner Außenmantelumfangsfläche (8), und eine verschleißfeste Überzugsschicht (7), welche die Außenmantelumfangsfläche (8) des Kerns (5) bedeckt, wobei das Ende der Außenmantelumfangsfläche (8) angefast ist, dadurch gekennzeichnet, dass
    das Ende der schraubenförmigen Nut (3) sich an einer von dem Ende des Kerns (5) etwas beabstandeten Position befindet, und dass an dem Ende der schraubenförmigen Nut (3) eine ringförmige Nut (3a) angeformt ist, so dass im Bereich der schraubenförmigen Nut (3) keine Erhebungen über die Außenmantelumfangsfläche (8) der Überzugsschicht (7) hervorstehen.
  2. Ventilstössel nach Anspruch 1, dadurch gekennzeichnet, dass der Durchmesser der schraubenförmigen Nut (3) zu deren Enden hin allmählich abnimmt.
  3. Verfahren zur Herstellung eines Ventilstössels einer Brennkraftmaschine, gekennzeichnet durch die folgenden Schritte:
    Ansetzen eines Schneidwerkzeugs an der Außenmantelumfangsfläche (8) eines zylindrischen Kerns (5) unter axialem Vorschub zwecks Bildung einer schraubenförmigen Nut (3) auf der Außenmantelumfangsfläche (8) des Kerns (5), während dieser um seine Achse rotiert wird;
    Unterbrechen des Werkzeugvorschubs, wenn die schraubenförmige Nut (3) in die Nähe eines Endes des Kerns (5) reicht, um an dem Ende der schraubenförmigen Nut (3) eine ringförmige Nut (3a) zu bilden;
    Bedecken der Außenmantelumfangsfläche (8) des Kerns (5) mit einer verschleißfesten Überzugsschicht (7), sowie
    Nachbearbeiten der Außenmantelumfangsfläche (8) in eine zylindrische Oberfläche, wobei wenigstens das Ende der zylindrischen Oberfläche angefast ist.
  4. Verfahren nach Anspruch 3, weiterhin gekennzeichnet durch den Schritt, dass bei dem Ansetzen eines Schneidwerkzeugs an der Außenmantelumfangsfläche (8) des zylindrischen Kerns (5) dem Schneidwerkzeug in der Nähe des Endes des Kerns (5) ein Vorschub in Richtung zu dessen Achse erteilt wird, so dass der Durchmesser der schraubenförmigen Nut (3) allmählich kleiner wird, wenn sie sich dem Ende des Kerns (5) nähert.
EP19960303151 1996-05-03 1996-05-03 Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren Expired - Lifetime EP0806549B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1996613959 DE69613959T2 (de) 1996-05-03 1996-05-03 Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren
EP00200571A EP1004753B1 (de) 1996-05-03 1996-05-03 Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren
EP19960303151 EP0806549B1 (de) 1996-05-03 1996-05-03 Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19960303151 EP0806549B1 (de) 1996-05-03 1996-05-03 Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP00200571A Division EP1004753B1 (de) 1996-05-03 1996-05-03 Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren

Publications (2)

Publication Number Publication Date
EP0806549A1 EP0806549A1 (de) 1997-11-12
EP0806549B1 true EP0806549B1 (de) 2001-07-18

Family

ID=8224920

Family Applications (2)

Application Number Title Priority Date Filing Date
EP00200571A Expired - Lifetime EP1004753B1 (de) 1996-05-03 1996-05-03 Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren
EP19960303151 Expired - Lifetime EP0806549B1 (de) 1996-05-03 1996-05-03 Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP00200571A Expired - Lifetime EP1004753B1 (de) 1996-05-03 1996-05-03 Ventilstössel einer Brennkraftmaschine und Herstellungsverfahren

Country Status (2)

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EP (2) EP1004753B1 (de)
DE (1) DE69613959T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013206011A1 (de) 2013-04-05 2014-10-09 Schaeffler Technologies Gmbh & Co. Kg Stößel zur Ventil- oder Pumpenbetätigung und Herstellungsverfahren für einen Stößel zur Ventil- oder Pumpenbetätigung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715790A (en) * 1971-01-13 1973-02-13 Trw Inc Method of reinforcing piston ring grooves
DE3627505C2 (de) * 1986-08-13 1995-04-06 Motomak Sich selbsttätig hydraulisch einstellender Ventilstößel
GB9011125D0 (en) * 1990-05-17 1990-07-04 T & N Technology Ltd Tappets
JPH07310508A (ja) * 1994-05-19 1995-11-28 Fuji Oozx Inc 内燃機関用タペット

Also Published As

Publication number Publication date
EP1004753B1 (de) 2002-03-06
DE69613959D1 (de) 2001-08-23
EP1004753A1 (de) 2000-05-31
EP0806549A1 (de) 1997-11-12
DE69613959T2 (de) 2001-12-20

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