JP2573869B2 - Mounting structure of ceramic bearings - Google Patents
Mounting structure of ceramic bearingsInfo
- Publication number
- JP2573869B2 JP2573869B2 JP63240329A JP24032988A JP2573869B2 JP 2573869 B2 JP2573869 B2 JP 2573869B2 JP 63240329 A JP63240329 A JP 63240329A JP 24032988 A JP24032988 A JP 24032988A JP 2573869 B2 JP2573869 B2 JP 2573869B2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- silicon nitride
- ring
- inner ring
- interference
- 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 - Fee Related
Links
- 239000000919 ceramic Substances 0.000 title claims description 15
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 18
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 description 11
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Mounting Of Bearings Or Others (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、セラミック製軸受の取付構造、さらに詳
しくは、内輪、外輪および転動体のうち少なくとも内輪
が窒化ケイ素よりなるセラミック製軸受を、窒化ケイ素
より線膨脹係数の大きい鋼製の軸に取付ける構造に関す
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic bearing mounting structure, and more particularly, to a ceramic bearing in which at least an inner ring of an inner ring, an outer ring, and a rolling element is made of silicon nitride. The present invention relates to a structure to be attached to a steel shaft having a large linear expansion coefficient.
従来の技術および発明の課題 内輪、外輪および転動体がセラミックよりなるセラミ
ック製軸受は、金属に比べて高温強度が高いというセラ
ミックの特性より、高温で使用されることが多い。2. Related Art and Problems of the Invention Ceramic bearings in which the inner ring, the outer ring, and the rolling elements are made of ceramic are often used at high temperatures because of the characteristics of ceramics, in which high-temperature strength is higher than metal.
ところが、少なくとも内輪が窒化ケイ素よりなるセラ
ミック製軸受において、窒化ケイ素製内輪に取付けられ
る軸は窒化ケイ素より線膨脹係数の大きい鋼製であるた
め、高温でセラミック製軸受を使用する場合、鋼と窒化
ケイ素の線膨張係数の違いにより、鋼製軸と窒化ケイ素
製内輪のはめあいが問題になる。たとえば、高温でセラ
ミック製軸受を使用する場合は、使用する温度で鋼製軸
と窒化ケイ素製内輪のしめしろが０となるようにして使
用することが多い。したがって、使用条件が変化して温
度がさらに上昇した場合、鋼製軸の熱膨張によって窒化
ケイ素製内輪との間にしめしろが生じ、内輪が破損（割
損）する。However, in a ceramic bearing having at least an inner ring made of silicon nitride, a shaft attached to the inner ring made of silicon nitride is made of steel having a larger linear expansion coefficient than silicon nitride. Due to the difference in the coefficient of linear expansion of silicon, the fit between the steel shaft and the inner ring made of silicon nitride becomes a problem. For example, when a ceramic bearing is used at a high temperature, it is often used so that the interference between the steel shaft and the silicon nitride inner ring becomes zero at the temperature used. Therefore, when the operating conditions change and the temperature further rises, interference occurs between the steel shaft and the inner ring made of silicon nitride due to thermal expansion of the steel shaft, and the inner ring is damaged (cracked).
このため、鋼製軸と窒化ケイ素製内輪のしめしろを大
きくとれるセラミック製軸受の取付構造の開発が望まれ
ている。For this reason, there is a demand for the development of a mounting structure for a ceramic bearing that can provide a large interference between the steel shaft and the silicon nitride inner ring.
この発明の目的は、上記の問題を解決し、鋼製軸と窒
化ケイ素製内輪のしめしろを大きく設定でき、よって大
きな温度変化に対応できるセラミック製軸受の取付構造
を提供することにある。An object of the present invention is to solve the above-mentioned problems and to provide a mounting structure of a ceramic bearing which can set a large interference between a steel shaft and a silicon nitride inner ring, and can cope with a large temperature change.
課題を解決するための手段 この発明によるセラミック製軸受のの取付構造は、内
輪、外輪および転動体のうち少なくとも内輪が窒化ケイ
素よりなるセラミック製軸受の内輪が、窒化ケイ素より
線膨脹係数の大きい鋼製の中空軸に、使用する温度で所
定のしめしろとなるように取付けられていることを特徴
とするものである。Means for Solving the Problems The mounting structure of the ceramic bearing according to the present invention is a steel bearing in which at least the inner ring of the inner ring, the outer ring and the rolling elements is made of silicon nitride, and the inner ring of the ceramic bearing has a larger linear expansion coefficient than silicon nitride. Is mounted on a hollow shaft made of a steel so as to have a predetermined interference at the temperature used.
発明の作用および効果 この発明によれば、窒化ケイ素製の内輪に、窒化ケイ
素より線膨脹係数の大きい鋼製の中空軸が、使用する温
度で所定のしめしろとなるように取付けられるので、こ
れらの間にしめしろが生じたときに、中実軸に比べて中
空軸の変形が大きく、したがって、しめしろが等しい場
合、内輪に発生する引張応力（円周応力）は中実軸の場
合に比べて内輪がセラミックの中では靭性および強度の
高い窒化ケイ素製であることと相まって、内輪が割損す
るしめしろは中実軸の場合に比べて大きくなり、よって
中実軸の場合に比べてより大きな温度変化に対応するこ
とができる。According to the present invention, a steel hollow shaft having a higher linear expansion coefficient than silicon nitride is attached to the inner ring made of silicon nitride so that the steel shaft has a predetermined interference at the temperature used. When an interference occurs between the hollow shaft and the solid shaft, the deformation of the hollow shaft is larger than that of the solid shaft. Therefore, when the interference is equal, the tensile stress (circumferential stress) generated in the inner ring is smaller than that of the solid shaft In comparison with the fact that the inner ring is made of silicon nitride with high toughness and strength in ceramics, the interference that the inner ring breaks is larger than in the case of a solid shaft, and therefore, more than in the case of a solid shaft. It can respond to a large temperature change.
実 施 例 次に、上記効果を実証するため、この発明の実施例を
例示する。EXAMPLE Next, an example of the present invention will be described in order to demonstrate the above effects.
まず、第１図、第２図および第３図に示す３種類の試
料すなわちリング（１）、中実軸（２）および中空軸
（３）を準備した。これらの試料の材質および線膨張係
数は、表１のとおりである。First, three kinds of samples shown in FIGS. 1, 2 and 3, namely a ring (1), a solid shaft (2) and a hollow shaft (3) were prepared. The materials and linear expansion coefficients of these samples are as shown in Table 1.
リング（１）は熱間加圧焼結法（HP）により成形され
た窒化ケイ素Si3N4製、中実軸（２）および中空軸
（３）はステンレス鋼SUS303製である。リング（１）の
幅（長さ）Ｂは16mm、外径Doは38.5mm、内径Diは30mmで
ある。中実軸および中空軸の外径doは30mm、中空軸の内
径diは22mmである。 The ring (1) is made of silicon nitride Si 3 N 4 formed by hot pressure sintering (HP), and the solid shaft (2) and the hollow shaft (3) are made of stainless steel SUS303. The width (length) B of the ring (1) is 16 mm, the outer diameter Do is 38.5 mm, and the inner diameter Di is 30 mm. The outer diameter do of the solid shaft and the hollow shaft is 30 mm, and the inner diameter di of the hollow shaft is 22 mm.
次に、第４図に示すように、リング（１）の内側に中
実軸（２）を通し、軸（２）の両端部に形成された穴
（４）にヒータ（５）を挿入して、これらを加熱した。
なお、これらの穴（４）はリング（１）がはまる部分に
は達していない。これと同時に、熱電対（６）（７）に
より軸（２）およびリング（１）の温度を測定して、こ
れらの間のしめしろを求め、リング（１）が割損するし
めしろ（割損しめしろ）を調べた。しめしろは、軸
（２）単体の温度と外径の関係、リング（１）単体の温
度と内径の関係を予め求めておき、軸（２）およびリン
グ（１）の温度の測定値から計算により求めた。Next, as shown in FIG. 4, a solid shaft (2) is passed through the inside of the ring (1), and a heater (5) is inserted into holes (4) formed at both ends of the shaft (2). And heated them.
Note that these holes (4) do not reach the portion where the ring (1) fits. At the same time, the temperatures of the shaft (2) and the ring (1) are measured by the thermocouples (6) and (7) to determine the interference between them, and the interference (breakage) at which the ring (1) breaks. I checked. The interference is calculated in advance from the relationship between the temperature of the shaft (2) and the outside diameter, and the relationship between the temperature of the ring (1) and the inside diameter. Determined by
また、リング（１）に中空軸（３）を通し、同様に、
割損しめしろを調べた。Further, the hollow shaft (3) is passed through the ring (1), and similarly,
The margin for breakage was examined.
これらの試験結果を第５図および表２に示す。 The test results are shown in FIG. 5 and Table 2.
第５図は、割損しめしろと累積破損確率との関係を示
す。表２には、累積破損確率が10％と50％の場合の割損
しめしろ、ワイブル係数およびしめしろ比（割損しめし
ろの比）を示す。 FIG. 5 shows the relationship between the break allowance and the cumulative failure probability. Table 2 shows the breakage interference, the Weibull coefficient and the interference ratio (ratio of breakage interference) when the cumulative failure probability is 10% and 50%.
これらの結果より、中空軸を使用すると窒化ケイ素製
リングの割損しめしろが中実軸に比べて約1.3倍になる
ことがわかる。From these results, it can be seen that when the hollow shaft is used, the breakage of the silicon nitride ring is about 1.3 times that of the solid shaft.
第１図は比較試験のために準備したリングの縦断面図、
第２図は同中実軸の横断面図、第３図は同中空軸の横断
面図、第４図は試験の概要を示す説明図、第５図は試験
結果を示すグラフである。FIG. 1 is a longitudinal sectional view of a ring prepared for a comparative test,
2 is a cross-sectional view of the solid shaft, FIG. 3 is a cross-sectional view of the hollow shaft, FIG. 4 is an explanatory diagram showing an outline of the test, and FIG. 5 is a graph showing the test results.
Claims (1)
内輪が窒化ケイ素よりなるセラミック製軸受の内輪が、
窒化ケイ素より線膨脹係数の大きい鋼製の中空軸に、使
用する温度で所定のしめしろとなるように取付けられて
いることを特徴とするセラミック製軸受の取付構造。1. An inner race of a ceramic bearing in which at least the inner race of the inner race, the outer race and the rolling elements is made of silicon nitride,
A mounting structure for a ceramic bearing, which is mounted on a steel hollow shaft having a higher linear expansion coefficient than silicon nitride so as to have a predetermined interference at a temperature used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63240329A JP2573869B2 (en) | 1988-09-26 | 1988-09-26 | Mounting structure of ceramic bearings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63240329A JP2573869B2 (en) | 1988-09-26 | 1988-09-26 | Mounting structure of ceramic bearings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0289815A JPH0289815A (en) | 1990-03-29 |
| JP2573869B2 true JP2573869B2 (en) | 1997-01-22 |
Family
ID=17057858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63240329A Expired - Fee Related JP2573869B2 (en) | 1988-09-26 | 1988-09-26 | Mounting structure of ceramic bearings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2573869B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1331451A (en) * | 1970-06-12 | 1973-09-26 | Secr Defence | Welding |
| JPS6213227U (en) * | 1985-07-10 | 1987-01-27 |
-
1988
- 1988-09-26 JP JP63240329A patent/JP2573869B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0289815A (en) | 1990-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4719074A (en) | Metal-ceramic composite article and a method of producing the same | |
| US2297508A (en) | Rotor for turbines | |
| US4518315A (en) | Arrangement for connecting a ceramic rotor wheel, particularly a turbine rotor wheel of a turbomachine, such as a gas turbine engine, to a metallic shaft | |
| JPS6253684B2 (en) | ||
| EP0179539A1 (en) | Turbine rotor units and method of producing the same | |
| US4770549A (en) | Ceramics bearing | |
| US4886695A (en) | Ceramic-metal composite bodies | |
| US4808014A (en) | Attaching structure for ceramics bearing | |
| US5129784A (en) | Ceramic rotor and metal shaft assembly | |
| JP2573869B2 (en) | Mounting structure of ceramic bearings | |
| JPH06100210B2 (en) | Adapter member | |
| EP1746397A1 (en) | Ceramic thermocouple | |
| US5180249A (en) | Thermally stressed, torsionally rigid connection | |
| EP0156484B1 (en) | Metal ceramics composite article and a method of producing the same | |
| JP2617300B2 (en) | Mounting structure of ceramics bearings | |
| JP3749612B2 (en) | Rolling bearing | |
| JPH11325092A (en) | Fitting structure for ceramic bearing | |
| US4892436A (en) | Shaft composite structure between ceramic turbine rotor and metal member | |
| JPH0310683B2 (en) | ||
| JPS6321558Y2 (en) | ||
| JPS6128844B2 (en) | ||
| JP4415110B2 (en) | High temperature heat treatment furnace | |
| JPH053770Y2 (en) | ||
| JP2970029B2 (en) | Ring attachment device | |
| JPH0459441B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |