EP0784148A1 - Poussoir dans un moteur à combustion interne - Google Patents

Poussoir dans un moteur à combustion interne Download PDF

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Publication number
EP0784148A1
EP0784148A1 EP96610002A EP96610002A EP0784148A1 EP 0784148 A1 EP0784148 A1 EP 0784148A1 EP 96610002 A EP96610002 A EP 96610002A EP 96610002 A EP96610002 A EP 96610002A EP 0784148 A1 EP0784148 A1 EP 0784148A1
Authority
EP
European Patent Office
Prior art keywords
shim
tappet
side wall
upper wall
internal combustion
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Withdrawn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
EP96610002A
Other languages
German (de)
English (en)
Inventor
Akihiro Hamada
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 EP96610002A priority Critical patent/EP0784148A1/fr
Publication of EP0784148A1 publication Critical patent/EP0784148A1/fr
Withdrawn legal-status Critical Current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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/205—Adjusting or compensating clearance by means of shims or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • the present invention relates to a tappet in use for a direct acting type valve operating mechanism in an internal combustion engine of a vehicle, and especially to a tappet which has no annular groove on an inner corner between an upper wall and a side wall for supporting a shim.
  • Fig. 3 schematically illustrates a direct acting type valve operating mechanism in use for a DOHC type engine.
  • a poppet valve 101 is provided in a cylinder head 105 with a pair of cotters 102, a valve spring retainer 103 and a valve spring 104.
  • a cylindrical tappet body 106 which is closed by an upper wall 107, the lower surface of the upper wall 107 being engaged with the end of a stem of the valve.
  • a recess 109 is formed by an annular side wall 108 projected on the outer circumference of the upper wall 107, a disc-shaped shim 110 for adjusting valve clearance being removably engaged in the recess 109.
  • the valve 101 is opened and closed by pressing a tappet body 116 slidably engaged in the cylinder head 105, by a rotary cam 111 which contacts the upper surface of the shim 110.
  • annular clearance groove 113 which opens towards the recess 109, on the corner 112 between the side wall 108 and the upper surface of the upper wall 107 of the tappet body 106.
  • the clearance groove 113 is provided to fit the shim 110 on the upper surface of the upper wall 107 and to prevent stress concentration to the corner 112.
  • the tappet body 106 is molded by cold forging, it is inevitable to form a curved surface 112a on the corner 112 between the upper wall 107 and the side wall 108. Owing to the curved surface 112a, when the shim 110 is fitted in the recess 109, the circumferential edge of the shim 110 is engaged on the curved surface 112a, thereby preventing fitting with the upper wall 107.
  • the clearance groove 113 is formed as shown in Figs. 5 and 6.
  • the inner circumferential surface of the side wall 108 is cut by the edge of a bite 114 having substantially the same width with that of the clearance groove 113, the edge of the bite 114 is pressed against the corner 113, and the upper surface of the upper wall 107 is continuously finished.
  • the clearance groove 113 is formed by the edge of the bite 114, and the inner circumferential surface of the side wall 108 and the upper surface of the upper wall 107 are simultaneously ground and finished.
  • the lower side wall 108 is thinner, so that the side wall 108 is likely to cause fatigue rupture when the side wall 108 is repeatedly subjected to large lateral load when the engine is operated.
  • a tappet device in an internal combustion engine comprising:
  • the chamfer is formed on the lower circumferential edge, so that the lower circumferential edge of the shim is not engaged with the curved surface of the corner between the side wall and the upper wall of the tappet, thereby fitting the shim on the upper wall of the tappet body.
  • a shim 10 is molded by powder metallurgy, and has a chamfer 10b on the lower circumferential edge, the chamfer 10b having a concave section 10b.
  • a tappet body 6 a corner between a side wall 8 and an upper wall 7 is formed as a curved surface as made by cold forging.
  • Fig. 2 (a) to (e) illustrates variations of the chamfer.
  • (a) shows a chamfered portion 10d;
  • (b) shows a right-angled groove;
  • (c) shows a rounded portion 10f;
  • (d) shows a concaved portion 10g; and
  • (e) shows a portion 10h which comprises a right-angle and a rounded portion.
  • a chamfer may be formed on the upper circumferential edge 10c, so that the shim 10 can be reversibly used.
  • the shim may be made by punching and then, the chamfer 10b may be made by a lathe etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP96610002A 1996-01-15 1996-01-15 Poussoir dans un moteur à combustion interne Withdrawn EP0784148A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96610002A EP0784148A1 (fr) 1996-01-15 1996-01-15 Poussoir dans un moteur à combustion interne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96610002A EP0784148A1 (fr) 1996-01-15 1996-01-15 Poussoir dans un moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP0784148A1 true EP0784148A1 (fr) 1997-07-16

Family

ID=8225510

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96610002A Withdrawn EP0784148A1 (fr) 1996-01-15 1996-01-15 Poussoir dans un moteur à combustion interne

Country Status (1)

Country Link
EP (1) EP0784148A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2018931A (en) * 1978-04-01 1979-10-24 Daimler Benz Ag Multicylinder internal combustion engine with valve shut-off means
GB2151742A (en) * 1983-12-20 1985-07-24 Bl Tech Ltd A bucket-type tappet
US5236274A (en) * 1991-06-25 1993-08-17 Ngk Spark Plug Co., Ltd. Installation of wear-resistant chip on mechanical part
EP0581406A1 (fr) * 1992-07-31 1994-02-02 Fuji Oozx Inc. Procédé de fixation d'un embout dans un poussoir de soupape

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2018931A (en) * 1978-04-01 1979-10-24 Daimler Benz Ag Multicylinder internal combustion engine with valve shut-off means
GB2151742A (en) * 1983-12-20 1985-07-24 Bl Tech Ltd A bucket-type tappet
US5236274A (en) * 1991-06-25 1993-08-17 Ngk Spark Plug Co., Ltd. Installation of wear-resistant chip on mechanical part
EP0581406A1 (fr) * 1992-07-31 1994-02-02 Fuji Oozx Inc. Procédé de fixation d'un embout dans un poussoir de soupape

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