JPH04314903A - Tappet - Google Patents
TappetInfo
- Publication number
- JPH04314903A JPH04314903A JP10865491A JP10865491A JPH04314903A JP H04314903 A JPH04314903 A JP H04314903A JP 10865491 A JP10865491 A JP 10865491A JP 10865491 A JP10865491 A JP 10865491A JP H04314903 A JPH04314903 A JP H04314903A
- Authority
- JP
- Japan
- Prior art keywords
- flange
- tappet
- crowning
- ceramic plate
- maximum thickness
- 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
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000006903 response to temperature Effects 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Transmission Devices (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、自動車用エンジン等の
内燃機関その他の産業用機械に用いるタペットに関する
。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tappets used in internal combustion engines such as automobile engines and other industrial machines.
【0002】0002
【従来の技術】従来、タペット等の摺動部品の摺動面は
、カム等との片当たりを防止する目的で中央に向かって
数μm〜数十μmの緩やかな膨らみを持たせた所謂クラ
ウニング形状になっている。このクラウニング形状は三
次曲面であるため、研磨等の方法では成形が困難でコス
トが高くつく。そこで、金属にセラミック板をろう付け
し、その両者の熱膨張率の差を利用してセラミック板の
表面にクラウニング形状をつけるようにした技術が本出
願人の出願に係る特開昭63−225728号に開示さ
れている。[Prior Art] Conventionally, the sliding surfaces of sliding parts such as tappets have so-called crowning, which has a gentle bulge of several μm to several tens of μm toward the center in order to prevent uneven contact with cams, etc. It has a shape. Since this crowning shape is a three-dimensional curved surface, it is difficult to form it by methods such as polishing, and the cost is high. Therefore, a technique is disclosed in Japanese Patent Laid-Open No. 63-225728, filed by the present applicant, in which a ceramic plate is brazed to a metal and a crowning shape is applied to the surface of the ceramic plate by utilizing the difference in thermal expansion coefficient between the two. Disclosed in the issue.
【0003】0003
【発明が解決しようとする課題】前記特開昭63−22
5728号の技術は、第1にろう付けする際に接合炉内
の場所によって若干の温度差や冷却速度の差があること
、第2に鋼材のロットによっても収縮量が僅かづつ異な
ること、等の理由によってクラウニング量のばらつきが
大きくなる虞がある。タペットに要求されるクラウニン
グ量は、少なすぎるとカムとの片当たりを生じ、多すぎ
ると面圧が高くなりすぎて異常摩耗の原因になるため、
非常に厳しく管理する必要がある。従って、クラウニン
グ量のばらつきを如何に許容範囲内に抑制できるかが前
記特開昭63−225728号の重要な課題であった。
また、エンジン等の運転時にタペットの温度が上昇する
と、金属とセラミックの熱膨張率の差によって金属が多
く伸びるためクラウニング量が減少する。このクラウニ
ング量の減少が初期クラウニング量を上回ると逆クラウ
ニング形状になり、カムとの片当たりを起こす。特に、
スライダー部の下端に鍔部を形成した所謂逆さ茸形のタ
ペットでは、鍔部の剛性がスライダー部に比べて小さい
ため変形し易く、運転時の熱で逆クラウニング形状にな
る危険性が高い。従って、このような運転時の熱による
クラウニング量の減少を如何に少なくできるかという点
も先の課題と同様に重要であった。[Problem to be solved by the invention] The above-mentioned Japanese Patent Application Laid-Open No. 63-22
The technology of No. 5728 has two problems: firstly, there are slight differences in temperature and cooling rate depending on the location in the welding furnace during brazing, and secondly, the amount of shrinkage differs slightly depending on the lot of steel material. There is a possibility that the variation in the amount of crowning becomes large due to this reason. If the amount of crowning required for the tappet is too small, it will cause uneven contact with the cam, and if it is too large, the surface pressure will be too high and cause abnormal wear.
It needs to be managed very strictly. Therefore, an important issue in the above-mentioned Japanese Patent Application Laid-Open No. 63-225728 was how to suppress the variation in the amount of crowning within an allowable range. Furthermore, when the temperature of the tappet increases during operation of an engine, etc., the metal expands more due to the difference in thermal expansion coefficient between the metal and the ceramic, resulting in a decrease in the amount of crowning. If this decrease in the amount of crowning exceeds the initial amount of crowning, an inverted crowning shape occurs, causing uneven contact with the cam. especially,
In a so-called inverted mushroom-shaped tappet in which a flange is formed at the lower end of the slider, the flange has less rigidity than the slider, so it is easily deformed, and there is a high risk of the tappet forming an inverted crowning shape due to heat during operation. Therefore, it is equally important to find out how to reduce the amount of crowning due to heat during operation.
【0004】本発明は上記従来技術に存する課題を克服
するべくなされたもので、生産時のクラウニング量のば
らつきを許容範囲に抑制し、さらに使用時(運転時)の
熱によってもクラウニング量の減少が少ないタペットの
提供を目的とする。[0004] The present invention has been made to overcome the problems existing in the prior art as described above, and is capable of suppressing variations in the amount of crowning during production to an acceptable range, and further reducing the amount of crowning due to heat during use (during operation). The purpose is to provide tappets with less
【0005】[0005]
【課題を解決するための手段】上記の目的を達成するた
め本発明は、スライダー部の下端に鍔部を形成した逆さ
茸形をなす金属製のタペット本体と、該タペット本体の
底壁に接合され、前記タペット本体との熱膨張率の差を
利用してクラウニング形状がつけられるセラミック板と
からなるタペットにおいて、タペット本体の鍔部の最大
厚みA2と鍔部径D1との寸法比を(A2/D1≧0.
1)にし、且つ、鍔部の最大厚みA2とセラミック板の
厚みA1との寸法比を(A2/A1≧2)にしたタペッ
トを提供するものである。またさらに望ましくは、前記
タペット本体の鍔部の最大厚みA2と鍔部径D1との寸
法比を(0.1≦A2/D1≦0.4)にするのが良い
。なお、ここで鍔部の最大厚みA2とは、鍔部の下端か
ら、スライダー部と同径の部分までの厚さをいう。[Means for Solving the Problems] In order to achieve the above object, the present invention provides an inverted mushroom-shaped metal tappet body with a flange formed at the lower end of a slider portion, and a metal tappet body that is bonded to the bottom wall of the tappet body. In a tappet made of a ceramic plate which is provided with a crowning shape by utilizing the difference in thermal expansion coefficient with the tappet body, the dimensional ratio between the maximum thickness A2 of the flange of the tappet body and the flange diameter D1 is (A2 /D1≧0.
1), and a tappet in which the dimensional ratio between the maximum thickness A2 of the collar and the thickness A1 of the ceramic plate is (A2/A1≧2). More preferably, the dimensional ratio between the maximum thickness A2 of the flange of the tappet body and the flange diameter D1 is (0.1≦A2/D1≦0.4). Note that the maximum thickness A2 of the flange section here refers to the thickness from the lower end of the flange section to a portion having the same diameter as the slider section.
【0006】[0006]
【作用】鍔部の最大厚みA2が鍔部径D1に対し0.1
倍未満の場合は鍔部の剛性が不足し、クラウニング量の
ばらつきが大きくなる。従って、過大なクラウニングが
ついて異常摩耗するか、或いは、クラウニングが小さす
ぎてカムとの片当たりを起こし、やはり異常摩耗する。
鍔部の最大厚みA2がセラミック板の厚みA1の2倍未
満の場合には、鍔部が変形してしまうため規定のクラウ
ニング量を得ることが難しく、また、運転時の熱影響を
受けて鍔部が多く膨張してクラウニング形状を保てない
。そしてさらに、セラミック板の厚みA1が薄い場合は
、運転時にセラミック板に作用する衝撃力を鍔部が吸収
しきれず、セラミック板が破壊する場合がある。一方、
鍔部の最大厚みA2と鍔部径D1との寸法比を高くして
ゆくと鍔部とセラミック板の接合部に大きな引張応力が
作用してセラミック板の割れや剥離という弊害が若干現
れる事があるが、請求項2のように、タペット本体の鍔
部の最大厚みA2を鍔部径D1の0.4倍以下に設定す
ればそのようなセラミック板の割れや剥離も防ぎ得る。
また、本発明の寸法比率に設定したものでは生産時のク
ラウニング量のばらつきが小さいが、それはタペットの
クラウニング量変化が温度変化に対して鈍感であること
を意味する。従って、運転時の温度変化に対しても鈍感
な反応を示し、クラウニング量の減少が極めて少ない。[Function] The maximum thickness A2 of the flange is 0.1 with respect to the flange diameter D1.
If it is less than twice that, the stiffness of the flange will be insufficient and the variation in the amount of crowning will increase. Therefore, excessive crowning occurs, causing abnormal wear, or crowning is too small, causing uneven contact with the cam, which also causes abnormal wear. If the maximum thickness A2 of the flange is less than twice the thickness A1 of the ceramic plate, the flange will be deformed, making it difficult to obtain the specified amount of crowning. The crowning shape cannot be maintained because the crowning part expands a lot. Further, if the thickness A1 of the ceramic plate is small, the flange cannot absorb the impact force acting on the ceramic plate during operation, and the ceramic plate may break. on the other hand,
As the dimensional ratio between the maximum thickness A2 of the flange and the diameter D1 of the flange increases, a large tensile stress acts on the joint between the flange and the ceramic plate, causing some problems such as cracking and peeling of the ceramic plate. However, if the maximum thickness A2 of the flange of the tappet body is set to 0.4 times or less the flange diameter D1, such cracking and peeling of the ceramic plate can be prevented. Furthermore, with the size ratio set according to the present invention, the variation in the amount of crowning during production is small, but this means that changes in the amount of crowning of the tappet are insensitive to changes in temperature. Therefore, it shows an insensitive response to temperature changes during operation, and the decrease in the amount of crowning is extremely small.
【0007】[0007]
【実施例1】図1は実施例1を示すタペットIの縦断面
図である。該タペットIは、金属製のタペット本体1の
底壁にセラミック板2を接合したものである。タペット
本体1は、プッシュロッドとの当たり面となる半球状の
凹部3を頂部に形成した円柱状のスライダー部4と、そ
のスライダー部4の下端に形成した略円錐台径の鍔部5
とからなり、総合的に逆さ茸形をしている。材質は、J
ISSNCM630であり、かかる材質の丸棒から削り
だして成形する。セラミック板2は窒化珪素90重量%
にY2O3−Al2O3系焼結助材を混合し、成形バイ
ンダを加えて金型プレスにより円板状に成形し、焼成後
両面を研磨加工した。タペット本体1とセラミック板2
はTiを含む銀ろうにより真空中で800℃×30分で
加熱接合した。銀ろうはAg−Cu−In−Ti系を用
いた。タペットIの形状は、鍔部5の最大厚みA2と鍔
部径D1との寸法比が(A2/D1≧0.1)を満足し
、且つ、鍔部5の最大厚みA2とセラミック板2の厚み
A1との寸法比が(A2/A1≧2)となるように設定
される。Embodiment 1 FIG. 1 is a longitudinal sectional view of a tappet I showing Embodiment 1. The tappet I has a ceramic plate 2 bonded to the bottom wall of a metal tappet body 1. The tappet body 1 includes a cylindrical slider portion 4 having a hemispherical concave portion 3 formed at the top that serves as a contact surface with the push rod, and a collar portion 5 having a substantially truncated conical diameter formed at the lower end of the slider portion 4.
The overall shape is an upside-down mushroom. The material is J.
ISSNCM630, and is machined and molded from a round bar made of such material. Ceramic plate 2 is made of 90% silicon nitride by weight.
A Y2O3-Al2O3-based sintering aid was mixed with the mixture, a molding binder was added thereto, and the material was molded into a disk shape using a mold press. After firing, both surfaces were polished. Tappet body 1 and ceramic plate 2
were heated and bonded in vacuum at 800° C. for 30 minutes using silver solder containing Ti. Ag-Cu-In-Ti based silver solder was used. The shape of the tappet I is such that the dimensional ratio between the maximum thickness A2 of the flange 5 and the flange diameter D1 satisfies (A2/D1≧0.1), and the maximum thickness A2 of the flange 5 and the ceramic plate 2 are The dimensional ratio with the thickness A1 is set to be (A2/A1≧2).
【0008】次に、タペットIに基づくテストサンプル
を多数製作しクラウニング量について調べた。テストサ
ンプルの各部の寸法は、全長L=80mm、鍔部径D1
=φ40mm、スライダー部径D2=25mm、セラミ
ック板2の厚みA1=2mm,3mm、鍔部5のテーパ
角α=10゜,30゜とし、本発明の効果を確認するた
め鍔部5の最大厚みA2を種々変更した。そして、テス
トサンプルを、1つの形状について5種類の鋼材ロット
(鋼材の溶解ロット)各20個づつを用いて合計100
個製作し、その100個の全てについてクラウニング量
を測定した。この作業を全てのテストサンプルごとに行
った。各々の形状でのクラウニング量のばらつきを標準
偏差値(±3σ)で表し、その結果を図2のグラフに示
す。なお、テストサンプルで許容されるクラウニング量
は15μm〜45μmであることが他の試験で確認され
ている。すなわち、この値以外のものはカムとの片当た
りや、面圧の上昇等の問題が発生し、カムが異常摩耗す
るのである。従って、許容されるクラウニング量の幅は
30μm以下である。Next, a large number of test samples based on tappet I were manufactured and the amount of crowning was investigated. The dimensions of each part of the test sample are: total length L = 80 mm, flange diameter D1
= φ40 mm, slider diameter D2 = 25 mm, thickness A1 of ceramic plate 2 = 2 mm, 3 mm, taper angle α of flange 5 = 10°, 30°, and in order to confirm the effect of the present invention, the maximum thickness of flange 5 was determined. Various changes were made to A2. Then, a total of 100 test samples were prepared using 20 pieces each of 5 types of steel lots (melted steel lots) for each shape.
Each piece was produced, and the amount of crowning was measured for all 100 pieces. This work was performed for every test sample. The variation in the amount of crowning for each shape is expressed as a standard deviation value (±3σ), and the results are shown in the graph of FIG. In addition, it has been confirmed in other tests that the amount of crowning allowed in the test sample is 15 μm to 45 μm. That is, a value other than this will cause problems such as uneven contact with the cam and an increase in surface pressure, resulting in abnormal wear of the cam. Therefore, the width of the allowable crowning amount is 30 μm or less.
【0009】図2のグラフより、鍔部5の最大厚みA2
と鍔部径D1の比が(A2/D1<0.1)のものはク
ラウニング量のばらつきが大きくて問題あることが判る
。また、鍔部5の最大厚みA2とセラミック板2の厚み
A1の比が(A2/A1<2)のものでは、仮に鍔部5
の最大厚みA2と鍔部径D1の比が(A2/D1≧0.
1)であっても規定値に入らないものが多くあった。一
方、鍔部5の最大厚みA2と鍔部径D1の比が(A2/
D1>0.4)のものではセラミック板2の割れや接合
面の剥離が、セラミック板2の厚みA1=2mmのもの
で2%、セラミック板2の厚みA1=3mmのもので8
%あった。この結果は、鍔部の最大厚みA2と鍔部径D
1との寸法比を(A2/D1≦0.4)にすることによ
り本発明の効果がより完全に達成できることを示す。ま
たそれと同時に、鍔部5の最大厚みA2と鍔部径D1の
比が(A2/D1>0.4)であっても不良率が僅かで
あることから、(A2/D1)の上限値を限定しない請
求項1の発明でも、所期の目的を十分達成できることが
判る。From the graph of FIG. 2, the maximum thickness A2 of the flange 5
It can be seen that those in which the ratio of the diameter D1 and the diameter D1 of the flange is (A2/D1<0.1) are problematic because of large variations in the amount of crowning. Furthermore, if the ratio of the maximum thickness A2 of the flange 5 to the thickness A1 of the ceramic plate 2 is (A2/A1<2), if the flange 5
The ratio of the maximum thickness A2 and the flange diameter D1 is (A2/D1≧0.
Even for 1), there were many that did not fall within the specified values. On the other hand, the ratio of the maximum thickness A2 of the flange 5 to the flange diameter D1 is (A2/
D1>0.4), the cracking of the ceramic plate 2 and the peeling of the joint surface were 2% for the ceramic plate 2 with a thickness A1 of 2 mm, and 8% for the ceramic plate 2 with a thickness A1 of 3 mm.
%there were. This result is the maximum thickness A2 of the flange and the diameter D of the flange.
It is shown that the effects of the present invention can be more fully achieved by setting the size ratio to (A2/D1≦0.4). At the same time, even if the ratio of the maximum thickness A2 of the flange 5 to the flange diameter D1 is (A2/D1>0.4), the defect rate is small, so the upper limit of (A2/D1) is It can be seen that even the invention of claim 1, which is not limited, can sufficiently achieve the intended purpose.
【0010】次に、前記試験で得られたタペットIの中
から、クラウニング量の小さなもの(約15μm)を抽
出し、運転時最大温度相当である150℃に加熱した状
態でのクラウニング量を測定した。その結果を図3のグ
ラフに示した。このようにタペットを150℃に加熱し
て測定した結果、室温状態で許容範囲内のクラウニング
が形成されている場合でも、鍔部5の最大厚みA2と鍔
部径D1との比が(A2/D1<0.1)のものでは、
クラウニング形状が保たれずに殆どフラットになったり
、或いは逆クラウニング形状になってしまうことが確認
できた。そしてテストサンプルの一部をOHVディーゼ
ルエンジン(排気量 15,000cc、8気筒)に
装着し、定格回転数(約2,500rpm)の150%
で100時間運転したところ、前記セラミック板2がフ
ラットになったり逆クラウニング形状になったタペット
Iはカムに異常摩耗が発生した。一方、本発明に係るタ
ペットIを使用したものでは、タペットI及びカムの双
方とも摩耗量は3μm以下であり全く問題はなかった。Next, from among the tappets I obtained in the above test, one with a small amount of crowning (approximately 15 μm) was extracted, and the amount of crowning was measured while heated to 150° C., which corresponds to the maximum temperature during operation. did. The results are shown in the graph of FIG. As a result of heating the tappet to 150°C and measuring it, it was found that even when crowning was formed within the allowable range at room temperature, the ratio of the maximum thickness A2 of the flange 5 to the flange diameter D1 was (A2/ For those with D1<0.1),
It was confirmed that the crowning shape was not maintained and became almost flat, or the crowning shape was reversed. Then, a part of the test sample was installed in an OHV diesel engine (displacement 15,000cc, 8 cylinders), and the engine speed was increased to 150% of the rated rotation speed (approximately 2,500 rpm).
When the tappet I was operated for 100 hours, the ceramic plate 2 became flat or had an inverted crowning shape, and abnormal wear occurred on the cam. On the other hand, in the case where the tappet I according to the present invention was used, the wear amount of both the tappet I and the cam was 3 μm or less, and there was no problem at all.
【0011】[0011]
【実施例2】図4は実施例2のタペットIIを示す縦断
面図である。該タペットIIは、金属製のタペット本体
1を上半部1aと下半部1bに分割形成して溶接接合し
、このタペット本体1の底壁にセラミック板2をろう付
け接合したものである。上半部1aはJIS S40
Cの鋼材丸棒から有底円筒状に削りだし、900℃に加
熱して油焼き入れしたものである。下半部1bはJIS
SNCM630の鋼材を削りだして成形したもので
ある。セラミック板2は前記タペットIと同じである。
そして、先ず下半部1bとセラミック板2を前記タペッ
トIと同じ条件でろう付けしたのち、上半部1aと下半
部1bを電子ビーム溶接により接合した。Embodiment 2 FIG. 4 is a longitudinal sectional view showing a tappet II of Embodiment 2. The tappet II has a metal tappet body 1 divided into an upper half 1a and a lower half 1b which are welded together, and a ceramic plate 2 is brazed to the bottom wall of the tappet body 1. Upper half 1a is JIS S40
It is machined into a bottomed cylindrical shape from a round steel bar of No. C, and heated to 900°C and quenched in oil. The lower half 1b is JIS
It is machined and molded from SNCM630 steel. The ceramic plate 2 is the same as the tappet I described above. First, the lower half 1b and the ceramic plate 2 were brazed under the same conditions as the tappet I, and then the upper half 1a and the lower half 1b were joined by electron beam welding.
【0012】次に、タペットIIに基づくテストサンプ
ルを製作し、前記と同様クラウニング量のばらつきを調
べた。各々の形状でのクラウニング量のばらつき(±3
σ)を図5に示す。なお、タペットII各部の寸法は、
全長L=60mm、鍔部径D1=φ33mm、スライダ
ー部外径D2=20mm、同内径D3=15mm、セラ
ミック板2の厚みA1=1.5mm,2mm,3mm、
鍔部5のテーパ角α=20゜(但し、A2/D1<0.
1のものは10゜)とし、本発明の効果を確認するため
鍔部5の最大厚みA2を種々変更した。この結果からも
本発明に係るタペットIIのクラウニング形状が許容範
囲にあることが確認できる。Next, test samples based on Tappet II were manufactured, and variations in the amount of crowning were investigated in the same manner as above. Variation in crowning amount for each shape (±3
σ) is shown in FIG. In addition, the dimensions of each part of Tappet II are as follows:
Total length L = 60 mm, flange diameter D1 = φ33 mm, slider part outer diameter D2 = 20 mm, same inner diameter D3 = 15 mm, thickness A1 of ceramic plate 2 = 1.5 mm, 2 mm, 3 mm,
Taper angle α of flange 5 = 20° (however, A2/D1<0.
1), and the maximum thickness A2 of the flange portion 5 was variously changed in order to confirm the effect of the present invention. This result also confirms that the crowning shape of the tappet II according to the present invention is within the permissible range.
【0013】[0013]
【発明の効果】以上テストサンプルによる試験結果から
明かなように、本発明のタペットは、生産時のクラウニ
ング量のばらつきを最小限に抑制することができる。こ
れによりタペット製造の歩留まりを大幅に向上させるこ
とができる。すなわち、クラウニング量自体は、セラミ
ック板の接合温度や冷却温度を変えることによってコン
トロールできるから、許容されるクラウニング量の範囲
内にばらつきが収まるように接合温度等を設定すればよ
いのである。また、本発明の寸法比率に設定したもので
は、クラウニング量変化が温度変化に対して鈍感になり
、運転時の温度変化に対してもクラウニング量の減少が
極めて少なくなる。如上のように本発明は、金属とセラ
ミック板の熱膨張率の差を利用してクラウニング形状を
つける技術の生産性と信頼性を著しく高めることができ
る。また、請求項2のように鍔部の最大厚みを鍔部径の
0.4倍以下に制限することによって、生産時における
セラミック板の割れや剥離等の不良も生じない効果があ
る。[Effects of the Invention] As is clear from the above test results using the test samples, the tappet of the present invention can minimize variations in the amount of crowning during production. As a result, the yield rate of tappet manufacturing can be significantly improved. In other words, since the amount of crowning itself can be controlled by changing the bonding temperature and cooling temperature of the ceramic plates, the bonding temperature and the like can be set so that the variation is within the range of the allowable crowning amount. Further, when the dimensional ratio of the present invention is set, the crowning amount changes are insensitive to temperature changes, and the crowning amount decreases very little even with temperature changes during operation. As described above, the present invention can significantly improve the productivity and reliability of the technique of forming a crowning shape by utilizing the difference in coefficient of thermal expansion between metal and ceramic plates. Furthermore, by limiting the maximum thickness of the flange to 0.4 times or less the diameter of the flange, defects such as cracking and peeling of the ceramic plate during production are prevented.
【図1】実施例1を示すタペットの縦断面図である。FIG. 1 is a longitudinal sectional view of a tappet showing Example 1.
【図2】(鍔部最大厚み/鍔部径)と(クラウニング量
のばらつき)の関係を示すグラフである。FIG. 2 is a graph showing the relationship between (maximum thickness of flange/diameter of flange) and (variation in crowning amount).
【図3】(鍔部最大厚み/鍔部径)と(150℃でのク
ラウニング量)の関係を示すグラフである。FIG. 3 is a graph showing the relationship between (maximum thickness of flange/diameter of flange) and (amount of crowning at 150° C.).
【図4】実施例2を示すタペットの縦断面図である。FIG. 4 is a longitudinal cross-sectional view of a tappet showing Example 2.
【図5】(鍔部最大厚み/鍔部径)と(クラウニング量
のばらつき)の関係を示すグラフである。FIG. 5 is a graph showing the relationship between (maximum thickness of flange/diameter of flange) and (variation in crowning amount).
I,II …タペット 1 …タペット本体 2 …セラミック板 4 …スライダー部 5 …鍔部 D1 …鍔部径 A1 …セラミック板の厚み A2 …鍔部の最大厚み I, II...Tappet 1 …Tappet body 2… Ceramic plate 4 …Slider section 5…Trim section D1...Flame diameter A1...Thickness of ceramic plate A2...Maximum thickness of the flange
Claims (2)
逆さ茸形をなす金属製のタペット本体と、該タペット本
体の底壁に接合され、前記タペット本体との熱膨張率の
差を利用してクラウニング形状がつけられるセラミック
板とからなるタペットにおいて、タペット本体の鍔部の
最大厚みA2と鍔部径D1との寸法比を(A2/D1≧
0.1)にし、且つ、鍔部の最大厚みA2とセラミック
板の厚みA1との寸法比を(A2/A1≧2)にしたこ
とを特徴とするタペット。Claim 1: A metal tappet body having an inverted mushroom shape with a flange formed at the lower end of the slider portion, and a metal tappet body that is joined to the bottom wall of the tappet body and utilizes the difference in coefficient of thermal expansion between the tappet body and the tappet body. In a tappet consisting of a ceramic plate that is crowned with
0.1), and the dimensional ratio between the maximum thickness A2 of the collar portion and the thickness A1 of the ceramic plate is (A2/A1≧2).
2と鍔部径D1との寸法比を(0.1≦A2/D1≦0
.4)にしたことを特徴とする請求項1記載のタペット
。[Claim 2] Maximum thickness A of the flange portion of the tappet body
2 and the flange diameter D1 (0.1≦A2/D1≦0
.. 4) The tappet according to claim 1, wherein the tappet has the following features.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10865491A JP2715381B2 (en) | 1991-04-12 | 1991-04-12 | Tappet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10865491A JP2715381B2 (en) | 1991-04-12 | 1991-04-12 | Tappet |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04314903A true JPH04314903A (en) | 1992-11-06 |
JP2715381B2 JP2715381B2 (en) | 1998-02-18 |
Family
ID=14490292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10865491A Expired - Lifetime JP2715381B2 (en) | 1991-04-12 | 1991-04-12 | Tappet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2715381B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0794321A1 (en) | 1995-06-19 | 1997-09-10 | Sumitomo Electric Industries, Limited | Sliding part and method for manufacturing the same |
US5809842A (en) * | 1995-06-26 | 1998-09-22 | Sumitomo Electric Industries, Ltd. | Ceramic sliding component |
JP2012072671A (en) * | 2010-09-28 | 2012-04-12 | Hitachi Automotive Systems Ltd | Valve lifter for internal combustion engine |
-
1991
- 1991-04-12 JP JP10865491A patent/JP2715381B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0794321A1 (en) | 1995-06-19 | 1997-09-10 | Sumitomo Electric Industries, Limited | Sliding part and method for manufacturing the same |
US5783314A (en) * | 1995-06-19 | 1998-07-21 | Sumitomo Electric Industries, Ltd. | Sliding component and production method thereof |
US5809842A (en) * | 1995-06-26 | 1998-09-22 | Sumitomo Electric Industries, Ltd. | Ceramic sliding component |
JP2012072671A (en) * | 2010-09-28 | 2012-04-12 | Hitachi Automotive Systems Ltd | Valve lifter for internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
JP2715381B2 (en) | 1998-02-18 |
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