EP0779410A1 - Verbundeinstellplatte zur Benutzung bei einer Brennkraftmaschine - Google Patents

Verbundeinstellplatte zur Benutzung bei einer Brennkraftmaschine Download PDF

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Publication number
EP0779410A1
EP0779410A1 EP95309155A EP95309155A EP0779410A1 EP 0779410 A1 EP0779410 A1 EP 0779410A1 EP 95309155 A EP95309155 A EP 95309155A EP 95309155 A EP95309155 A EP 95309155A EP 0779410 A1 EP0779410 A1 EP 0779410A1
Authority
EP
European Patent Office
Prior art keywords
shim
tappet
whiskers
aluminum alloy
present
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.)
Granted
Application number
EP95309155A
Other languages
English (en)
French (fr)
Other versions
EP0779410B1 (de
Inventor
Seiichi c/o Fuji Oozx Inc. Nagakawa
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 DE69501666T priority Critical patent/DE69501666T2/de
Priority to EP95309155A priority patent/EP0779410B1/de
Publication of EP0779410A1 publication Critical patent/EP0779410A1/de
Application granted granted Critical
Publication of EP0779410B1 publication Critical patent/EP0779410B1/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
    • F01L1/16—Silencing impact; Reducing wear
    • 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
    • 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
    • F01L2301/02—Using ceramic materials

Definitions

  • the present invention relates to a new composite for use in a valve clearance adjusting shim to be provided and to be inserted directly between a valve tappet and a cam for an overhead valve engine with a camshaft placed in an internal combustion engine.
  • a composite shim comprising aluminum alloy, and ceramic material.
  • FIG. 1 shows schematically a cross section of a cam-valve tappet movement mechanism comprising an engine valve 1, a spring retainer 2, mounted on a shaft end of the engine valve 1 through cotters 3 and 3 and a valve spring 4 provided between a cylinder (not shown) and the spring retainer 2.
  • the engine valve 1 reciprocates by a rotation of a cam 7 to press on a top surface of a shim 6 mounted in a tappet 5.
  • a cam 7 mounted on a camshaft (not shown) is rotated in a very high rate, and pushes the valve 1 through the shim 6 and a tappet 5, so as to open and close acutely periodically the valve 1 to comply the timing of the valve with the revolution rate of the engine. Therefore, much shock and concentrated force must be loaded periodically and repeatedly on the contact surface of the shim 6 with which the cam 7 is in contact.
  • the shim 6 mounted on the upper surface of the tappet 5 is highly loaded by the cam 7, and further exposed to strong abrasion by reciprocating movement, and then, a hard and abrasion-resistance metal material e.g. chromium molybdenum steel may be used for manufacture of the shim.
  • a hard and abrasion-resistance metal material e.g. chromium molybdenum steel may be used for manufacture of the shim.
  • a reinforced aluminum alloy might be used as a material for a lightweighted tappet shim, but it does not satisfy the requirement on abrasion resistance and toughness of the shim.
  • Japanese Patent Laid-open application No. 60-183207/1985 proposed use of sintered steel for the valve shim to improve strength against the shock from the tappet rod motion.
  • Japanese Patent Laid-open application No. 3-83307/1991 proposed an internal hollow(s) or concaved hollow provided within the shim to reduce its weight.
  • FIG. 1 shows schematically a cross section of a cam-valve tappet movement mechanism using the shim of the present invention.
  • FIG. 2 shows a process of manufacturing the tappet shim in accordance with the present invention.
  • the shim comprises a matrix of aluminum alloy and at least one member selected from particles, whiskers and fibers, and made from SiC, SiN or CrC, in an amount ranging from 3 volume percent to 25 volume percent. Further, when the particles are used, a size of the particles of SiC, SiN or CrC should be less than 5 micrometer. In addition, when the whiskers or/and fibers are used, a size of the whiskers or/and fibers of SiC, SiN or CrC should range from 10 to 100 micrometer.
  • Aluminum alloy to be used as a matrix for a tappet shim in accordance with the present invention can be reinforced by dispersing finely divided ceramic particles, whiskers or fibers in the matrix alloy phase, so as to obtain high shock resistance and high abrasion resistance.
  • aluminum alloy having a 2000 order in JIS standard for aluminum alloy is preferable. Further, especially duralumin series alloy may be preferable. Aluminum alloy containing copper, manganese and/or magnesium may be preferable as a matrix alloy to be used in accordance with the present invention.
  • Finely divided particles, whiskers and/or fibers of at least one selected from the group consisting of SiC, SiN and CrC are dispersed in the alloy matrix in an amount of preferably 3 volume % to 25 volume % so as to prepare a material for use in the shim of the present invention. If the amount is less than 3 volume %, the abrasion resistance of the shim may be not enough. If the amount is more than 25 volume %, the shim will be brittle or fragile, and further may be difficult to be machined. The more preferable amount is 17 volume % to 25 volume %.
  • the size of finely divided SiC, SiN or CrC particles is preferably less than 5 micrometer. If the size is beyond 5 micrometer, the machining properties of the shim will be lost.
  • the length of the whiskers or fibers of SiC, SiN or CrC is preferably 10 micrometer to 100 micrometer.
  • the whiskers having this range length are easily available, and easily used and treated.
  • the starting aluminum alloy to be used in accordance with the present invention should be selected in view of the characteristics of the sintering matrix containing ceramic particles, whiskers or/and fibers.
  • the tappet shim of the present invention is manufactured as follows:
  • both powders; aluminum alloy powder and desired ceramic particles or/and whiskers or/and fibers are mixed with desired ratio.
  • the aluminum alloy powder to used as a matrix is mixed with a ceramic powder (or/and whiskers or/and fibers) of desired ceramic material selected from SiC, SiN and CrC in the ratio ranging less than 25 volume %, and homogeneously agitated and mould into a desired form of moulding. Then, the moulding is fired so as to sinter thereby producing porous material of the present invention.
  • the resulting porous material is treated to degas and then, extruded as shown in FIG. 2 thereby eliminating pores in the material.
  • the resulting material will have higher density as improved by extrusion
  • the resulting material is machined into a desired bar, which will be cut into the desired plate for use in the shim of the present invention.
  • the tappet shim of the present invention comprises aluminum alloy for a matrix, and ceramic finely divided particles or/and whiskers or/and fibers contained therein, which is for use in a shim for an internal engine.
  • the resulting mixture of aluminum alloy powder and ceramic particles or whiskers or/and fibers may be pressed to form a desired shape.
  • hot isostatic pressing HIP
  • hot isostatic pressure sintering pseudo HIP
  • injection moulding can be used in the manufacture of the shim by sintering of the product.
  • Sintering in ambient atmosphere can be carried out in a continuous furnace with feeding a protective gas (inert gas such as nitrogen gas) by preheating to vaporize or to decompose a lublicating agent, and then heating so as to make sintering of the composite.
  • the ceramic material to be used as a starting material for the product of the present invention may include silicon nitride(SiN), silicon carbide(SiC), and chromium carbide (CrC).
  • the mixture comprising the desired powder components may be prepared, and then, the portion thereof may be put in a cavity of a mould for compression formation. Then, it may be pressed under the certain pressure for premoulding, and thereafter, the remaining mixture may be put in the remain cavity of the mould, and may be pressed additionally under the pressure.
  • Aluminium alloy corresponding to JIS 2024 is used as a matrix aluminum alloy.
  • the JIS 2024 aluminum alloy power and SiC powder were mixed and agitated uniformly.
  • the two species of bars comprising the aluminum alloy matrix and SiC particles respectively in the amounts of 17 volume percent and 25 volume percent dispersed therein were prepared and machined. Further, two species of samples were tested for engine application.
  • the abrasion amounts of the ceramic incorporated aluminum alloy shim of the present invention was 4 to 9 micrometer per 100 hours, while the abrasion amounts of the conventional steel shim was 5 to 8 micrometer. It is evident that the shim of the present invention is competitive.
  • FIG. 2 illustrates a process of manufacturing a tappet shim comprising aluminum alloy and finely divided ceramics incorporated therein.
  • the ceramics incorporated aluminum alloy as sintered 11 was exerted on an extruding machine 12 to extrude into a bar 13.
  • the resulting bar 13 was cut as shown in FIG. 2 (B) into each blank 14.
  • the blank 14 is machined into a finished shim. Pores or porosity 15 in the sintered material 11 were pressed and then, mostly eliminated so that the relative density is improved from relative density of about 80 % to relative density of about 90 %.
  • the shim of the present invention may be relatively uncostly and easy to be manufactured.
  • the shim structure of the present invention can be manufactured without reduction of high strength and high abrasion durability even with lighter weight.
  • the shim of the present invention can be manufactured relatively uncostly. Then, the allowance revolution number of the engine using this shim can be improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP95309155A 1995-12-15 1995-12-15 Verbundeinstellplatte zur Benutzung bei einer Brennkraftmaschine Expired - Lifetime EP0779410B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE69501666T DE69501666T2 (de) 1995-12-15 1995-12-15 Verbundeinstellplatte zur Benutzung bei einer Brennkraftmaschine
EP95309155A EP0779410B1 (de) 1995-12-15 1995-12-15 Verbundeinstellplatte zur Benutzung bei einer Brennkraftmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95309155A EP0779410B1 (de) 1995-12-15 1995-12-15 Verbundeinstellplatte zur Benutzung bei einer Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0779410A1 true EP0779410A1 (de) 1997-06-18
EP0779410B1 EP0779410B1 (de) 1998-02-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95309155A Expired - Lifetime EP0779410B1 (de) 1995-12-15 1995-12-15 Verbundeinstellplatte zur Benutzung bei einer Brennkraftmaschine

Country Status (2)

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EP (1) EP0779410B1 (de)
DE (1) DE69501666T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2035630A1 (de) * 2006-07-03 2009-03-18 Villeroy & Boch Gustavsberg AB Hahn
CN103939164A (zh) * 2014-04-25 2014-07-23 安徽江淮汽车股份有限公司 一种发动机气门间隙调节器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57153912A (en) * 1981-03-17 1982-09-22 Mazda Motor Corp Pad for tappet of internal combustion engine
JPH01130008A (ja) * 1987-11-13 1989-05-23 Otai Iron Works Co Ltd バルブリフタ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57153912A (en) * 1981-03-17 1982-09-22 Mazda Motor Corp Pad for tappet of internal combustion engine
JPH01130008A (ja) * 1987-11-13 1989-05-23 Otai Iron Works Co Ltd バルブリフタ

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
MAMORU MABUCHI ET AL: "SUPERPLASTIC BEHAVIOR IN A HIGH STRAIN RATE RANGE OF 6061 ALUMINIUM COMPOSITES REINFORCED WITH SI3N4 WHISKERS OR PARTICULATES", JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, INTERNATIONAL EDITION, vol. 100, no. 4, 1 April 1992 (1992-04-01), pages 498 - 501, XP000294748 *
MANISH ROY ET AL: "THE EFFECT OF PARTICULATE REINFORCEMENT ON THE SLIDING WEAR BEHAVIOR OF ALUMINUM MATRIX COMPOSITES", METALLURGICAL TRANSACTIONS A. PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 23A, no. 10, 1 October 1992 (1992-10-01), pages 2833 - 2847, XP000356340 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 260 (M - 180) 18 December 1982 (1982-12-18) *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 376 (M - 862) 21 August 1989 (1989-08-21) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2035630A1 (de) * 2006-07-03 2009-03-18 Villeroy & Boch Gustavsberg AB Hahn
EP2035630A4 (de) * 2006-07-03 2012-12-12 Villeroy & Boch Gustavsberg Ab Hahn
CN103939164A (zh) * 2014-04-25 2014-07-23 安徽江淮汽车股份有限公司 一种发动机气门间隙调节器
CN103939164B (zh) * 2014-04-25 2016-08-17 安徽江淮汽车股份有限公司 一种发动机气门间隙调节器

Also Published As

Publication number Publication date
EP0779410B1 (de) 1998-02-25
DE69501666D1 (de) 1998-04-02
DE69501666T2 (de) 1998-06-18

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