EP0523691B1 - Keramisches Spielausgleichselement - Google Patents

Keramisches Spielausgleichselement Download PDF

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Publication number
EP0523691B1
EP0523691B1 EP19920112147 EP92112147A EP0523691B1 EP 0523691 B1 EP0523691 B1 EP 0523691B1 EP 19920112147 EP19920112147 EP 19920112147 EP 92112147 A EP92112147 A EP 92112147A EP 0523691 B1 EP0523691 B1 EP 0523691B1
Authority
EP
European Patent Office
Prior art keywords
adjusting shim
ceramic
valve
silicon nitride
cam
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
EP19920112147
Other languages
English (en)
French (fr)
Other versions
EP0523691A3 (en
EP0523691A2 (de
Inventor
Kenji C/O Itami Works Of Sumitomo Matsunuma
Takao C/O Itami Works Of Sumitomo Nishioka
Akira C/O Itami Works Of Sumitomo Yamakawa
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0523691A2 publication Critical patent/EP0523691A2/de
Publication of EP0523691A3 publication Critical patent/EP0523691A3/en
Application granted granted Critical
Publication of EP0523691B1 publication Critical patent/EP0523691B1/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
    • F01L1/20—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
    • 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
    • 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

Definitions

  • This invention relates to a ceramic valve clearance adjusting shim used in a valve operating mechanism for an internal combustion engine.
  • FIG. 3 is a longitudinal section of a valve operating mechanism for an engine.
  • a reference numeral 1 denotes a cylinder head of an engine, 2 a cam, 3 a valve lifter, 4 an adjusting shim, 5 an intake or exhaust valve, 6 a valve seat and 7 a valve spring.
  • the valve lifter 3 is driven by the cam 2, and the displacement of the cam 2 is transmitted to the intake or exhaust valve 5.
  • an adjusting shim 4 is disposed between the valve lifter 3 and cam 2.
  • a longitudinal section of the adjusting shim 4 is shown in FIG. 1. The adjusting shim 4 is used to regulate a valve clearance.
  • a conventional adjusting shim 4 consists usually of a metal
  • an adjusting shim formed out of a ceramic material for the purpose of reducing the weight thereof and improving the wear resistance thereof from EP-A-0 209 697. This document is silent as regards surface roughness.
  • DE-A-32 39 325 discloses a cam-contacting insert, the surface roughness of the cam-contacting surface being Ra ⁇ 0,2 ⁇ m.
  • an object of the present invention is to provide a ceramic valve clearance adjusting shim having a smooth surface in which the above-mentioned problems are eliminated.
  • a ceramic valve clearance adjusting shim comprising a ceramic material, the adjusting shim contacting a cam and a valve lifter and being movably disposed on the valve lifter, whereby the surface roughness of surfaces of the adjusting shim contacting the cam and the valve lifter is not more than 0.2 ⁇ m in ten-point average roughness (Rz) according to Japanese industrial standard JIS B 0601.
  • silicon nitride is mainly used as the ceramic material for the ceramic valve clearance adjusting shim.
  • FIG. 1 is a longitudinal section of an adjusting shim.
  • FIG. 2 is a longitudinal section of an adjusting shim and a valve lifter.
  • FIG. 3 is a longitudinal section of a valve operating mechanism for an engine.
  • FIG. 4 is a longitudinal section of an apparatus for testing a product according to the present invention.
  • the roughness of the surface (designated by a reference numeral 8 in FIG. 1), which the cam contacts of the ceramic adjusting shim is not more than 0.2 ⁇ m in ten-point average roughness (Rz), and a torque loss caused thereby becomes smaller than that in a case where a conventional metal adjusting shim is used.
  • a torque loss caused thereby is substantially equal to that in a case where the ten-point average roughness is 0.2 ⁇ m.
  • an abrasion loss of the valve lifter decreases sharply in accordance with a decrease in the surface roughness of the ceramic adjusting shim.
  • an abrasion loss of the valve lifter becomes substantially constant.
  • valve clearance adjusting shims as shown in FIG. 1 were produced out of a silicon nitride ceramic sintered body having a relative density of not less than 98%.
  • the surface, which a cam contacts, i.e. the surface designated by a reference numeral 8 shown in FIG. 1, of each of the adjusting shims was finished under various conditions by a diamond wheel to set the roughness of the surfaces of these adjusting shims to levels shown in Table 1.
  • Each of the adjusting shims thus produced was subjected to the evaluation of power loss with respect to the power consumption of a motor rotated at a predetermined number of revolutions per minute (2000 RPM and 4000 RPM in terms of number of revolutions per minute of engine), by using a motoring system shown in FIG.
  • Table 1 shows the results of the above with the results of similar evaluation of power loss caused by conventional steel adjusting shims which constitute comparative examples.
  • Table 1 No. Material for adjusting shim Surface roughness Rz of contact surface ( ⁇ m) Power consumption of motor (kW ) 2000 RPM 4000 RPM *1 Silicon nitride 1.5 1.13 1.24 *2 Silicon nitride 1.2 1.11 1.22 *3 Silicon nitride 1.0 1.08 1.18 *4 Silicon nitride 0.7 1.00 1.10 *5 Silicon nitride 0.5 0.94 1.03 6 Silicon nitride 0.2 0.90 0.99 7 Silicon nitride 0.05 0.89 0.98 *8 Silicon nitride 2.5 1.20 1.32 *9 Silicon nitride 5.0 (not processed) 1.32 1.45 *10 Cr-Mo steel 5.0 1.17 1.28 * comparative examples 1, 2, 3, 4, 5 and 8 to 10
  • Example 2 Each of the adjusting shims produced under the same conditions as in Example 1 was subjected to a 200-hour continuous operation test with a motor rotated at a predetermined number of revolutions per minute (6000 RPM in terms of number of revolutions per minute of engine), by using the motoring system used in Example 1, and the abrasion loss, which was determined after the tests had been completed, of the valve lifter was evaluated.
  • the evaluating of the abrasion loss of the valve lifter was done by measuring the inner diameter, which is shown by a reference numeral 11 in FIG. 2, of the valve lifter before and after each test was conducted, and determining the quantity of variation thereof. The results of the evaluation are shown in Table 3. Table 3 No.
  • the present invention is not limited to these embodiments.
  • the surfaces of the adjusting shims were smoothed by being processed with a diamond wheel. Even if these surfaces are smoothed by being subjected to chemical and physical surface treatments (etching and coating), or a chemical applying treatment which is conducted before and after the sintering of a ceramic material, obtaining the same effect as those in the embodiments can be expected. The same effect can also be expected even if the roughness of the surfaces designated by the reference numerals 8, 9 and 10 in FIG. 1 is set to different levels according to different purposes.
  • the adjusting shim according to the present invention enables a power loss and wear resistance of a valve operating system to be reduced and increased respectively, and the fuel consumption, performance and durability of an internal combustion engine to be improved.

Landscapes

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

Claims (4)

  1. Ein keramisches Ventilspielausgleichselement (4), bestehend aus einem keramischen Material, wobei das Ausgleichselement (4) eine Nocke (2) und einen Ventilstößel (3) berührt und beweglich an dem Ventilstößel (3) angeordnet ist, dadurch gekennzeichnet, daß
    die Oberflächenrauheit der Oberflächen (8, 9 und 10) des die Nocke (2) und den Ventilstößel (3) berührenden Ausgleichselements (4) nicht mehr als 0,2 µm in der Zehn-Punkt-Durchschnittsrauheit (Rz) entsprechend der Japanischen Industrienorm JIS B 0601 beträgt.
  2. Das keramische Ventilspielausgleichselement nach Anspruch 1, wobei das keramische Material hauptsächlich aus Siliciumnitrid besteht.
  3. Das keramische Ventilspielausgleichselement nach Anspruch 1 oder 2, wobei die Rauheit der Oberfläche (8), welche die Nocke (2) berührt, identisch mit der Rauheit der Oberflächen (9, 10) ist, welche den Ventilstößel (3) berühren.
  4. Das keramische Ventilspielausgleichselement nach Anspruch 1 oder 2, wobei die Rauheiten der Oberflächen (8, 9 und 10) unterschiedlich sind.
EP19920112147 1991-07-19 1992-07-16 Keramisches Spielausgleichselement Expired - Lifetime EP0523691B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP179511/91 1991-07-19
JP3179511A JPH08226311A (ja) 1991-07-19 1991-07-19 セラミックス製アジャスティングシム

Publications (3)

Publication Number Publication Date
EP0523691A2 EP0523691A2 (de) 1993-01-20
EP0523691A3 EP0523691A3 (en) 1993-03-03
EP0523691B1 true EP0523691B1 (de) 1995-11-02

Family

ID=16067078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920112147 Expired - Lifetime EP0523691B1 (de) 1991-07-19 1992-07-16 Keramisches Spielausgleichselement

Country Status (4)

Country Link
EP (1) EP0523691B1 (de)
JP (1) JPH08226311A (de)
CA (1) CA2073887C (de)
DE (1) DE69205742T2 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0617198B1 (de) * 1993-03-26 1997-07-30 Fuji Oozx Inc. Ausgleichselementstruktur für einen Ventilstössel einer Brennkraftmaschine
JPH07127402A (ja) * 1993-10-29 1995-05-16 Sumitomo Electric Ind Ltd アジャスティングシムとカムの組合せ
JPH07269309A (ja) * 1994-03-28 1995-10-17 Fuji Oozx Inc 内燃機関のタペット用シム
US5410995A (en) * 1994-04-15 1995-05-02 Cummins Engine Company, Inc. Valve crosshead assembly with wear-reducing contact pad
JP4493106B2 (ja) 1997-12-26 2010-06-30 富士フイルム株式会社 デジタルカメラ
EP0984161A4 (de) 1998-03-19 2006-01-25 Sumitomo Electric Industries Kombination von distanzscheibe und nocke

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4366785A (en) * 1980-09-19 1983-01-04 Caterpillar Tractor Co. Tappet with wear resisting insert
DE3239325A1 (de) * 1982-10-23 1984-04-26 Feldmühle AG, 4000 Düsseldorf Ventilstoessel fuer einen verbrennungsmotor
DE3522403A1 (de) * 1985-06-22 1987-01-02 Stettner & Co Ventileinstellplatte

Also Published As

Publication number Publication date
JPH08226311A (ja) 1996-09-03
DE69205742D1 (de) 1995-12-07
CA2073887C (en) 1996-11-19
EP0523691A3 (en) 1993-03-03
DE69205742T2 (de) 1996-07-04
CA2073887A1 (en) 1993-01-20
EP0523691A2 (de) 1993-01-20

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