EP0803641B1 - Tappet in an internal combustion engine - Google Patents

Tappet in an internal combustion engine Download PDF

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Publication number
EP0803641B1
EP0803641B1 EP19960106398 EP96106398A EP0803641B1 EP 0803641 B1 EP0803641 B1 EP 0803641B1 EP 19960106398 EP19960106398 EP 19960106398 EP 96106398 A EP96106398 A EP 96106398A EP 0803641 B1 EP0803641 B1 EP 0803641B1
Authority
EP
European Patent Office
Prior art keywords
tappet
receiving plate
cam receiving
internal combustion
combustion engine
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
EP19960106398
Other languages
German (de)
French (fr)
Other versions
EP0803641A1 (en
Inventor
Kizuku Ohtsubo
Satoshi Fukuoka
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 EP00104802A priority Critical patent/EP1004752A3/en
Priority to DE1996613673 priority patent/DE69613673T2/en
Priority to EP19960106398 priority patent/EP0803641B1/en
Publication of EP0803641A1 publication Critical patent/EP0803641A1/en
Application granted granted Critical
Publication of EP0803641B1 publication Critical patent/EP0803641B1/en
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 invention relates to a tappet in an internal combustion engine as per the preamble of claim 1.
  • a tappet in an internal combustion engine of the said type has become known from
  • Al alloy tappets are widely used instead of conventional steel tappets.
  • Al alloy tappets are lower than steel alloy tappets in strength and wear resistance, and thus, wear resistant material is applied on the upper surface of a tappet which is slidably engaged with a rotary cam.
  • Fig. 4 illustrates a conventional Al tappet in which a cylindrical body 21 closed by an upper wall 21a at the upper end is molded from Al alloy. On the upper surface of the upper wall 21a, there is placed a wear resistant cam receiving plate 22 which has a smaller outer diameter than the body 21.
  • the cam receiving plate 22 is fixed on the upper surface of the upper wall 22a by bending an annular protrusion 21b inwardly at the outer circumference of the upper end of the body 21.
  • 23 denotes a rotary cam which contacts the upper surface of the cam receiving plate 22.
  • the cam receiving plate 22 of the Al alloy tappet acts as a cam follower to a nose 23a of the rotary cam 23.
  • the size or area of the cam receiving plate 22 must be equal or larger than a rotation trace of the nose 23a.
  • the maximum lift length is determined depending on the projected length of the nose 23a from a base circle. Efficiency of intake and exhaust air is determined on the lift length.
  • the cam receiving plate 22 is fixed by caulking of the annular protrusion 22b to decrease an effective surface area of the cam receiving plate 22 having a relatively large diameter in the body 21 having a relatively large diameter to provide a surface area corresponding to the nose 23a of the cam 23.
  • the tappet body increased in weight, the cylinder head increases in size, and flexibility in design of the engine decreases.
  • the embodiment comprises concentric annular grooves 11 and projections 12 which are suitably engaged with each other are formed on the top wall la and the cam receiving plate 10 respectively, thereby joining the cam receiving plate 10 to the top wall la with the brazing filler material 4. Engagement of the annular grooves 11 and projections 12 prevents release of joining surfaces owing to difference in thermal expansion between the body 1 and the cam receiving plate 10.
  • the present invention may be applied to a tappet which has a body made of Mg alloy.

Landscapes

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

Description

  • The invention relates to a tappet in an internal combustion engine as per the preamble of claim 1.
  • A tappet in an internal combustion engine of the said type has become known from
  • 1. Patent Abstracts of Japan vol. 15, no. 120 (M-1096), 25 March 1991 & JP-A-03 011107 (YAMAHA MOTOR CO LTD), 18 January 1991,
  • 2. Patent Abstracts of Japan vol. 15, no. 374 (M-1160), 20 Sept. 1991 & JP-A-03 149305 (NGK SPARK PLUG CO LTD), 25 June 1991,
  • 3. JP-A-07 332 028 (MITSUBISHI MATERIALS CORP), 19 December 1995
  • 4. DE-A-40 28 985 (BAYERISCHE MOTORENWERKE AG)
  • 5. US-A-5 284 112 (NISSAN MOTOR CO LTD).
  • To lighten a direkt acting type valve operating mechanism in an internal combustion engine, Al alloy tappets are widely used instead of conventional steel tappets. Al alloy tappets are lower than steel alloy tappets in strength and wear resistance, and thus, wear resistant material is applied on the upper surface of a tappet which is slidably engaged with a rotary cam.
  • Fig. 4 illustrates a conventional Al tappet in which a cylindrical body 21 closed by an upper wall 21a at the upper end is molded from Al alloy. On the upper surface of the upper wall 21a, there is placed a wear resistant cam receiving plate 22 which has a smaller outer diameter than the body 21. The cam receiving plate 22 is fixed on the upper surface of the upper wall 22a by bending an annular protrusion 21b inwardly at the outer circumference of the upper end of the body 21. 23 denotes a rotary cam which contacts the upper surface of the cam receiving plate 22.
  • The cam receiving plate 22 of the Al alloy tappet acts as a cam follower to a nose 23a of the rotary cam 23. To rotate the rotary cam 23 smoothly, the size or area of the cam receiving plate 22 must be equal or larger than a rotation trace of the nose 23a. The maximum lift length is determined depending on the projected length of the nose 23a from a base circle. Efficiency of intake and exhaust air is determined on the lift length. Thus, to obtain a desired intake and exhaust efficiency, it is necessary to determine the size of the projection of the nose 23a suitably and to keep the diameter of the cam receiving plate 22 in size which is corresponding to the projection of the nose 23a.
  • As the conventional tappets, since the cam receiving plate 22 is fixed by caulking of the annular protrusion 22b to decrease an effective surface area of the cam receiving plate 22 having a relatively large diameter in the body 21 having a relatively large diameter to provide a surface area corresponding to the nose 23a of the cam 23. However, the tappet body increased in weight, the cylinder head increases in size, and flexibility in design of the engine decreases.
  • It is the objective of the invention to provide a joint between the top ball of the body of the tappet and the cam receiving plate sufficiently strong during use, and to select an appropriate brazing filler material.
  • This objective is achieved by the characterizing portion of claim 1.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The features and advantages of the present invention will become more apparent from the following description with respect to the embodiment as shown in the drawing showing a central vertical sectional front view of the embodiment of the invention.
    • DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
  • The embodiment comprises concentric annular grooves 11 and projections 12 which are suitably engaged with each other are formed on the top wall la and the cam receiving plate 10 respectively, thereby joining the cam receiving plate 10 to the top wall la with the brazing filler material 4. Engagement of the annular grooves 11 and projections 12 prevents release of joining surfaces owing to difference in thermal expansion between the body 1 and the cam receiving plate 10.
  • The present invention may be applied to a tappet which has a body made of Mg alloy.
  • The foregoings merely relate to embodiments of the present invention. Various modifications and changes may be made by person skilled in the art without departing from the scope of claims wherein:

Claims (2)

  1. A tappet in an internal combustion engine, the tappet comprising:
    1.1 a cylindrical body (1) made of light metal and having a top wall (1a);
    1.2 a wear resistant cam receiving plate (2) which has roughly equal diameter to an outer diameter of the body (1);
    1.3 the cam receiving plate (2) being brazed on an upper surface of the body (1);
    characterized by the following features:
    1.4 there is provided a brazing filler material (4) with a melting point of 200 to 380° C;
    1.5 concentric projections (12) and grooves (11) are formed on contact surfaces of the top wall (1a) and the cam receiving plate (10), the projections (12) being engaged with the grooves (11).
  2. A tappet as defined in claim 1 wherein the light metal comprises Al alloy.
EP19960106398 1996-04-24 1996-04-24 Tappet in an internal combustion engine Expired - Lifetime EP0803641B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP00104802A EP1004752A3 (en) 1996-04-24 1996-04-24 Tappet in an internal combustion engine
DE1996613673 DE69613673T2 (en) 1996-04-24 1996-04-24 Valve tappet for an internal combustion engine
EP19960106398 EP0803641B1 (en) 1996-04-24 1996-04-24 Tappet in an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19960106398 EP0803641B1 (en) 1996-04-24 1996-04-24 Tappet in an internal combustion engine

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP00104802A Division EP1004752A3 (en) 1996-04-24 1996-04-24 Tappet in an internal combustion engine

Publications (2)

Publication Number Publication Date
EP0803641A1 EP0803641A1 (en) 1997-10-29
EP0803641B1 true EP0803641B1 (en) 2001-07-04

Family

ID=8222704

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19960106398 Expired - Lifetime EP0803641B1 (en) 1996-04-24 1996-04-24 Tappet in an internal combustion engine
EP00104802A Withdrawn EP1004752A3 (en) 1996-04-24 1996-04-24 Tappet in an internal combustion engine

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP00104802A Withdrawn EP1004752A3 (en) 1996-04-24 1996-04-24 Tappet in an internal combustion engine

Country Status (2)

Country Link
EP (2) EP0803641B1 (en)
DE (1) DE69613673T2 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239325A1 (en) * 1982-10-23 1984-04-26 Feldmühle AG, 4000 Düsseldorf Valve tappet for an internal combustion engine
JPS62276206A (en) * 1986-05-23 1987-12-01 Ngk Spark Plug Co Ltd Valve lifter
JPH0311107A (en) 1989-06-09 1991-01-18 Yamaha Motor Co Ltd Valve lifter
JPH03149305A (en) 1989-11-06 1991-06-25 Ngk Spark Plug Co Ltd Valve lifter
DE4028985A1 (en) 1990-09-13 1992-03-19 Bayerische Motoren Werke Ag IC engine valve push rod - has a push rod body of aaluminium@ alloy which can be hardened friction welded to a ferrous plate
JP3362866B2 (en) 1992-04-06 2003-01-07 日産自動車株式会社 Valve train and valve lifter
JP3331527B2 (en) * 1993-12-10 2002-10-07 フジオーゼックス株式会社 Tappet for internal combustion engine and method for manufacturing the same
JPH07332028A (en) * 1994-06-10 1995-12-19 Mitsubishi Materials Corp Valve lifter
US5458097A (en) * 1994-12-16 1995-10-17 Eaton Corporation Light weight valve lifter

Also Published As

Publication number Publication date
EP1004752A2 (en) 2000-05-31
EP1004752A3 (en) 2000-07-19
DE69613673D1 (en) 2001-08-09
EP0803641A1 (en) 1997-10-29
DE69613673T2 (en) 2002-05-16

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