WO2009157155A1 - 円筒ころ軸受 - Google Patents
円筒ころ軸受 Download PDFInfo
- Publication number
- WO2009157155A1 WO2009157155A1 PCT/JP2009/002750 JP2009002750W WO2009157155A1 WO 2009157155 A1 WO2009157155 A1 WO 2009157155A1 JP 2009002750 W JP2009002750 W JP 2009002750W WO 2009157155 A1 WO2009157155 A1 WO 2009157155A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cylindrical roller
- tapered
- ring
- roller bearing
- inner ring
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/34—Rollers; Needles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
- F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
- F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide the rollers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
- F16C33/605—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings with a separate retaining member, e.g. flange, shoulder, guide ring, secured to a race ring, adjacent to the race surface, so as to abut the end of the rolling elements, e.g. rollers, or the cage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/30—Angles, e.g. inclinations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/50—Crowning, e.g. crowning height or crowning radius
Definitions
- the present invention relates to a cylindrical roller bearing used for industrial machines and the like that require high speed rotation and high thrust load capability.
- providing a crowned portion having an ideal cross-sectional profile on the end surface of the cylindrical roller equalizes the contact surface pressure between the flange surface and the cylindrical roller in the contact portion when a thrust load is applied. It is effective.
- the above-described conventional technique is effective for obtaining an ideal contact state between the flange surface and the cylindrical roller.
- the cross-sectional outer shape of the end surface of the cylindrical roller is a curved shape
- Increased man-hours in terms of curvilinear shape management that is, in order to manage the curved shape, a commercially available shape measuring instrument is used, or as an alternative, for example, an enlarged portion B of the cylindrical roller 25 in FIG. 9A is shown in FIG.
- the amount of drop Y1, Y2 in the axial direction at each position X1, X2 deviated from the roller outer diameter edge position on the roller end face to the roller axis side needs to be measured. Become.
- An object of the present invention is to provide a cylindrical roller bearing that can improve the load capacity with respect to a thrust load and can easily manage the shape of the cylindrical roller.
- a cylindrical roller bearing according to the present invention includes an inner ring and an outer ring, and a plurality of cylindrical rollers that are rotatably interposed between raceway surfaces of the inner and outer rings, and either or both of the inner ring and the outer ring are shafts.
- a cylindrical roller bearing having flanges on both sides or one side in the direction, and when the outer diameter of the cylindrical roller is Da, the diameter 0.12 Da extending from the outer diameter edge of the cylindrical roller to the roller axis side
- a surface area in the range of -0.20 Da is a tapered crowned portion having an inclination angle of 0.25 ° -1 ° with respect to a plane perpendicular to the roller axis.
- the tapered crowned portion having the above-mentioned angle is provided in the surface area of the end surface of the cylindrical roller, the load capacity against the thrust load can be improved. Moreover, since the crowning portion is tapered, the shape of the cylindrical roller can be easily managed.
- the inner ring includes an inner ring race ring having a flange portion at one end and a raceway surface formed on the outer periphery, and a saddle ring disposed adjacent to the other end portion of the inner ring race ring, and the outer ring Is formed of an integral part having a flange part at both ends and having a raceway surface on the inner periphery, and has a saddle angle inclined with respect to a plane perpendicular to the inner ring axis of the inner side surface of the flange part of the inner ring raceway ring.
- ⁇ i is the angle of inclination of the inner surface of the flange of the outer ring that is inclined with respect to the plane perpendicular to the axis of the outer ring, ⁇ o, of the flange that protrudes on the outer diameter side of the raceway of the inner ring raceway in the saddle wheel
- this configuration even if there is a difference between the inclination angles, a sufficient effect can be obtained in improving the load capacity with respect to the thrust load.
- the runout of the tapered crowned portion on the end face of the cylindrical roller may be 0.003 mm or less. In the case of this configuration, there is an effect in suppressing the load capacity hindrance of the thrust load due to the dimensional error of the tapered crowned portion.
- the end face runout of the flat part excluding the tapered crowned part on the end face of the cylindrical roller may be 0.002 mm or less.
- the runout of the tapered crowned portion was measured in the same manner as the end face runout measurement method according to JIS B1506: 2005.
- the outer diameter surface of the said cylindrical roller is a crowning process part.
- the bearing dimensions can be reduced if the conventional product has a small load capacity for thrust load. Even for applications that must be increased, the bearing dimensions can be reduced.
- a crowned portion is also provided on the outer diameter surface of the cylindrical roller, thereby ensuring the load capacity of the radial load.
- the tapered crowned portion on the end surface of the cylindrical roller is composed of a plurality of tapered surface portions following the roller outer diameter side, and the inclination angle of the tapered surface portion of each step is larger as it is closer to the roller outer diameter side. You may do it.
- a tapered crowned portion with a plurality of tapered surface portions local edge stress can be suppressed at the boundary between the tapered crowned portion and the chamfered portion following the outer diameter side. Can be improved.
- the inclination angle of the tapered surface portion closest to the roller inner diameter side in the tapered crowned portion may be the angle ⁇ r in which the respective expressions of the previous invention are established.
- a difference in inclination angle between adjacent tapered surface portions in the tapered crowned portion may be 1 ° or less.
- the difference in the inclination angle between adjacent tapered surface portions should be within about 1 °. Is good.
- the runout of the tapered surface portion closest to the roller inner diameter side in the tapered crowned portion may be 0.003 mm or less.
- (A) is an expanded sectional view of the outer ring collar part in the cylindrical roller bearing
- (B) is an enlarged sectional view of the collar ring collar part
- (C) is an enlarged sectional view of the inner ring collar part.
- It is a graph of the test result which compared the rise temperature reduction effect of the cylindrical roller bearing with the conventional product.
- It is explanatory drawing of an example of a cylindrical roller bearing in case the end surface dimension error of a cylindrical roller is large.
- It is explanatory drawing of the other example of a cylindrical roller bearing in case the end surface dimension error of a cylindrical roller is large.
- This cylindrical roller bearing includes an inner ring 1 having flanges 7a and 8a at both ends and a raceway surface 3 formed on the outer periphery, and an outer ring having flanges 9a and 9a at both ends and a raceway surface 4 formed on the inner periphery. 2, a plurality of cylindrical rollers 5 interposed between the raceway surface 3 of the inner ring 1 and the raceway surface 4 of the outer ring 2, and a cage for guiding the cylindrical rollers 5 to equidistant positions in the circumferential direction. 6.
- the inner ring 1 includes an inner ring race 7 having a flange 7 a at one end and a raceway surface 3 formed on the outer periphery, and a saddle ring 8 disposed adjacent to the other end of the inner ring 7.
- the inner side surface 7 aa facing the one end surface of the cylindrical roller 5 is a flange surface that guides the cylindrical roller 5 in the axial direction.
- the inner side surface 8aa facing the other end surface of the cylindrical roller 5 guides the cylindrical roller 5 in the axial direction.
- the outer ring 2 is formed of an integral part having flanges 9a, 9a at both ends and a raceway surface 4 formed on the inner periphery.
- each inner side surface 9aa facing the end surface of the cylindrical roller 5 is a flange surface that guides the cylindrical roller 5 in the axial direction.
- the diameter 0.12 Da -0 extending from the outer diameter edge on the end surface of the cylindrical roller 5 to the roller axis O side. .20 Da (preferably 0.15 ⁇ 0.02 Da) is in the range of 0.25 ° to 1 ° (preferably 0.25 ° to 0.75) with respect to the plane perpendicular to the roller axis O.
- a tapered crowned portion 10 having an inclination angle ⁇ r of 0 ° is provided.
- a chamfered portion 11 continues on the outer diameter side of the crowned portion 10, and continues from the chamfered portion 11 to the outer diameter surface.
- the chamfered portion 11 may be tapered or arcuate in cross section.
- An inner side surface 9aa which is a flange surface in the flange portion 9a of the outer ring 2 has a tapered shape having a slight inclination angle ⁇ o with respect to a plane perpendicular to the axis of the outer ring, as shown in an enlarged cross-sectional view in FIG. It is said that.
- the inner side surface 8aa which is the flange surface of the flange portion 8a of the saddle wheel 8 is also a taper having a slight inclination angle ⁇ 1 with respect to a plane perpendicular to the center axis of the saddle wheel, as shown in an enlarged sectional view in FIG. It is made into a shape.
- the inner side surface 7aa which is a flange surface of the flange portion 7a of the inner ring raceway ring 7, also has a slight inclination angle ⁇ i with respect to a plane perpendicular to the inner ring axis as shown in the enlarged sectional view of FIG. It becomes the taper shape which becomes.
- the inclination angles ⁇ o, ⁇ 1, and ⁇ i are set to values in the range of 0.15 ° to 0.85 ° (preferably 0.25 ° to 0.6 °).
- the projecting height of the flanges 7a, 8a, 9a protruding in the radial direction from the races 3, 4 is in the range of 0.16 Da to 0.25 Da when the outer diameter of the cylindrical roller 5 is Da. Is set to a value within
- the runout of the tapered crowned portion 10 on the end face of the cylindrical roller 5, that is, the tolerance is set to 0.003 mm or less. Further, the runout of the flat portion 12 excluding the tapered crowned portion 10 on the end surface of the cylindrical roller 5, that is, the tolerance is set to 0.002 mm or less.
- FIG. 4 shows a result of a temperature rise test in which a plurality of samples whose shape dimensions and inclination angles fall within the ranges of the above values as a cylindrical roller bearing of this embodiment were compared with a conventional product. It is a graph to show.
- Radial load 5KN
- Thrust load 2KN
- Lubricating oil Turbine oil Rotational speed (inner ring rotation): 2000 to 10000 min -1 Under these conditions, the bearing temperature rise at each rotational speed was recorded.
- the tapered crowned portion 10 is provided on the end face of the cylindrical roller 5 as in the embodiment, it is extremely difficult to perform pinpoint processing with respect to the dimensions targeted in actual processing in consideration of mass production. . Therefore, in the above test, the inclination angle ⁇ r of the tapered crowned portion 10 is arbitrarily set, and the difference in the effect is confirmed.
- the flanges of the flanges 7a, 8a, and 9a should be considered unless skew and tilt are taken into consideration. It is desirable to make the inclination angles ⁇ i, ⁇ 1, and ⁇ o of the inner side surfaces 7aa, 8aa, and 9aa that are surfaces equal to the inclination angle ⁇ r of the tapered crowned portion 10.
- the inclination angle ⁇ o ⁇ 0.25 ° at the outer ring flange portion 9a, the inclination angle ⁇ i ⁇ 0.5 ° at the inner ring flange portion 7a, and the inclination angle ⁇ r of the tapered crowned machining portion 10 is 0.25 ° to Using samples with different inclination angles of 1 °, the effect on the effect was also confirmed. According to the test results, it was confirmed that the temperature rise is lower than that of the conventional product.
- the position at which the cylindrical roller 5 in the cylindrical roller bearing rotates depends on the rotational speed, the load, the viscosity of the lubricant, the type and material of the cage 6, and must be accurately determined. It is difficult.
- the cylindrical roller bearing of this embodiment limited to the numerical range described above can improve the load capacity against the thrust load as compared with the conventional product.
- the tapered crowned portion 10 on the end face of the cylindrical roller 5 has the shape shown in FIG. 2B is exemplified, but as shown in FIG. It is good also as the taper-shaped crowning process part 10 which consists of the surface parts 10a and 10b.
- the inclination angle ⁇ r1 of the tapered surface portion 10b close to the roller outer diameter side is set to be larger than the inclination angle ⁇ r of the taper surface portion 10a far from the roller outer diameter side ( ⁇ r1> ⁇ r).
- the tapered crowned portion 10 by forming the tapered crowned portion 10 with the two-step tapered surface portions 10a and 10b, local at the boundary between the tapered crowned portion 10 and the chamfered portion 11 following the outer diameter side thereof. Further suppression of edge stress can be further improved.
- the said taper surface part may be made into multiple steps
- the difference in inclination angle between adjacent tapered surface portions be within about 1 °. That is, for example, in the case of the example of FIG. 5 in which the tapered crowned portion 10 is formed by the two-step tapered surface portions 10a and 10b, ⁇ r1- ⁇ r ⁇ 1 ° (3) It is good to do. Further, in this case, the inclination angle of the tapered surface portion 10a closest to the roller inner diameter side in the tapered crowned portion 10 is preferably set to the inclination angle ⁇ r that satisfies the above equations (1) and (2).
- an R-shaped crowning processing portion having a monotonous cross-sectional shape or a logarithm at both ends of the outer diameter surface of the cylindrical roller 5 It is desirable to simultaneously provide a curved crowning section (see JP-A-2005-155663).
- the cylindrical roller bearing provided with a crowned portion having a curved cross-sectional outer shape on the end surface of the cylindrical roller also has an outer diameter surface of the cylindrical roller as described above.
- a thrust load can be applied by the contact of the flange surface of each flange portion 7a, 8a, 9a and the end surface of the cylindrical roller 5, but the shape is appropriate at the contact portion.
- the difference in roller length in the bearing and the dimensional error of the roller end face are also important factors.
- the contact traces of the flange surface of the flange portion 9a in the outer ring 2 which is a fixed ring are not uniform on the circumference, and the contact traces are conspicuous with the load area due to the radial load being substantially centered It turned out that it became. From this, it is considered that the cylindrical roller 5 that actually applies the thrust load is the cylindrical roller 5 that exists in the direction of the radial load region.
- FIG. 6A and 6B show the state of the cylindrical roller 5 that applies a thrust load and the cylindrical roller 5 in a non-load region that makes a phase difference of 180 ° from the radial load direction in the cylindrical roller bearing.
- the represented front view and sectional drawing are shown.
- the non-load region there is a radial internal clearance as indicated by reference numerals C1 and C2 in FIG. 6A, so that the cylindrical roller 5 can be tilted.
- the thrust load is reduced. No load. Accordingly, one cylindrical roller 5 repeatedly passes through the load area and the non-load area due to revolution.
- cylindrical rollers of grade 2 to 5 are often used for cylindrical roller bearings that are not precision products, and the tolerance in this case is 0.006 mm to 0.015 mm. Therefore, in the cylindrical roller 5 as shown in FIGS. 7 and 8, the amount of change in the axial length of the portion sandwiched between the flanges corresponds to the amount of deflection in the worst case, which is very large. .
- the runout of the tapered crowned portion 10 at the end face of the cylindrical roller 5 is set to 0.003 mm or less. Is desirable.
- the runout in the case of use in applications requiring low vibration and low noise such as an electric motor, it is preferable to set the runout to a level of 0.002 mm or less.
- the deflection of the tapered surface portion 10a closest to the inner diameter side may be 0.003 mm or less.
- the vibration of the tapered crowned portion 10 at the end face of the cylindrical roller 5 is referred to.
- the flat portion 12 see, for example, FIG. 2B
- the boundary between the tapered crowning part 10 and the flat part 12 is the circumference. It meanders or becomes elliptical. When such processing is performed, first, it becomes difficult to ensure the radial width dimension of the tapered crowned portion 10.
- the portion of the end surface of the cylindrical roller 5 that contacts the flange surface is the tapered crowning portion. Since it becomes a boundary part of 10 and the flat part 12, the smooth contact state at the time of rotation will be impaired.
- the end face runout of the flat portion 12 at the end face of the cylindrical roller 5 is set to 0.003 mm or less (preferably 0.002 mm or less). Is desirable.
- the case of the cylindrical roller bearing including the inner ring raceway ring 7, the outer ring 2, the saddle ring 8, the cylindrical roller 5, and the cage 6 has been illustrated, but in this invention, the saddle face and the end face of the cylindrical roller 5 are illustrated. Since the load performance of the thrust load is improved by optimizing the deflection of the tapered crowned portion 10 and the roller end face, the cylindrical roller is brought into one of the axial directions by axial deflection, although the thrust load is not applied. The effect of lowering the contact resistance can also be expected during one-sided running.
- Bearing types to which the present invention can be applied include NU type that does not have a collar on the inner ring, with inner ring flanges, with both outer ring flanges (NJ type), inner ring flanges, flange assembly, and outer ring flanges.
- NJ type outer ring flanges
- NUP type with both inner ring collars, without outer ring collar
- N type with both inner ring collars, with one outer ring collar
- NF type with both inner ring collars, one outer ring collar, one collar assembled type
- the present invention can also be applied to a full-roller cylindrical roller bearing without a cage.
- Examples of the processing method of the tapered crowned portion 10 on the end face of the cylindrical roller 5 include a method of processing by contacting a grindstone.
- a grindstone formed in advance into the outer shape of the tapered crowned portion 10 by dressing is used.
- the grindstone dress is not a complicated shape, it is simply formed linearly, and the error is very small. For this reason, the bus bar shape of the tapered crowned portion 10 to be processed does not vary greatly.
- the roughness may be improved by applying tumbler processing as the final processing for the purpose of suppressing initial wear and the like.
- tumbler processing By performing tumbler processing in this way, an effect of removing an edge portion formed at the boundary between the tapered crowned portion 10 and the flat portion 12 on the end face of the cylindrical roller 5 can be expected.
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Abstract
Description
例えば、特許文献1に開示の円筒ころ軸受では、スラスト荷重が負荷されたときのエッジロードを抑制するために、円筒ころの端面に断面外形が指数関数で表される曲線形状のクラウニング加工部を設けている。また、特許文献2に開示の円筒ころ軸受でも、円筒ころの端面に同様のクラウニング加工部を設けている。
この構成によると、円筒ころの端面における上記面域に、上記角度のテーパー状クラウニング加工部を設けたため、スラスト荷重に対する負荷能力を向上させることができる。また、クラウニング加工部はテーパー状であるため、円筒ころの形状管理も容易に行うことができる。
(θi +θo )-2・θr =-1.25°~0.25°
および、
(θ1 +θo )-2・θr =-1.25°~0.25°の各式が成り立つように設定しても良い。
この構成の場合、前記各傾斜角度間に差があっても、スラスト荷重に対する負荷能力を向上させるうえで十分な効果を上げることができる。
この発明の円筒ころ軸受では、円筒ころの端面にテーパー状クラウニング加工部を設けたことにより駆動時の温度上昇を抑制することできることから、スラスト荷重の負荷能力の小さい従来品であれば軸受寸法を大きくしなければならないような応用面に対しても、軸受寸法を小さくして対応できる。しかし、スラスト荷重の負荷能力を確保できる程度まで軸受寸法を小さくした場合には、ラジアル荷重の負荷能力にも配慮が必要となる。そこで、円筒ころの外径面にもクラウニング加工部を設けており、これによりラジアル荷重の負荷能力も確保することができる。
このように、複数段のテーパー面部でテーパー状クラウニング加工部を形成することにより、テーパー状クラウニング加工部と、その外径側に続く面取部との境界での局部的なエッジ応力の抑制を向上させることができる。
複数段のテーパー面部でテーパー状クラウニング加工部を形成した場合、隣り合うテーパー面部の境界でのエッジ応力の発生が懸念されるので、隣り合うテーパー面部の傾斜角度の差は1°程度以内としておくのが良い。
外輪2は、両端部に鍔部9a,9aを有し内周に軌道面4を形成した一体の部品からなる。外輪2の各鍔部9aでは、その前記円筒ころ5の端面に対向する各内側面9aaが、円筒ころ5を軸方向に案内する鍔面とされている。
内径φ35mm、外径φ80mm、幅21mmのサイズの軸受
ラジアル荷重:5KN
スラスト荷重:2KN
潤滑油:タービン油
回転速度(内輪回転):2000~10000min -1
のもとで、各回転速度毎の軸受温度上昇値を記録した。
円筒ころ5の端面を理想的な曲面クラウニングに加工することは、理論的には有効であると考えられるが、上記した試験結果からも明らかなように、実際の円筒ころ軸受では、この実施形態のようにテーパー状クラウニング加工部10で代用しても、十分にスラスト荷重に対する負荷能力を向上させることができる。また、テーパー状クラウニング加工部10の傾斜角度θr に多少の幅があっても、一定の限度内であれば大きな性能差が出ないことも上記試験結果から確認された。
(θi +θo )- 2・θr =-1.25°~0.25° ……(1)
の関係が成立する範囲であれば、前記各傾斜角度間に差があっても十分な効果を上げることができる。
なお、上式(1)の左辺の値が、-1.25°よりも小さい場合は、ころと鍔部の内側面7aa、8aa、9aaの軌道面から最も離れた位置である7bb、8bb、9bbの接触が顕著となり、この部分での面圧が過大となって焼付きが生じる恐れがある。
0.25を超える場合は、ころと鍔部の内側面7aa、8aa、9aaの軌道面に最も近い位置である7cc、8cc、9ccの接触が顕著となり、この部分での面圧が過大となって焼付きが生じる恐れがある。
また、鍔輪鍔部8aの鍔面の傾斜角度θ1 、外輪鍔部9aの鍔面の傾斜角度θo 、およびテーパー状クラウニング加工部10の傾斜角度θr の間についても、
(θ1 +θo )- 2・θr =-1.25°~0.25° ……(1)
の関係が成立する範囲であれば、前記各傾斜角度間に差があっても十分な効果を上げることができる。
θr1-θr ≦1° ……(3)
とするのが良い。また、この場合、テーパー状クラウニング加工部10におけるころ内径側に最も近いテーパー面部10aの傾斜角度を、先の各式(1),(2)が成り立つ傾斜角度θr とするのが良い。
上記した試験に用いたサンプルを確認したところ、固定輪である外輪2における鍔部9aの鍔面の接触痕は円周上で均一ではなく、ラジアル荷重による負荷域を略中心として接触痕が顕著になっていることが判った。このことから、スラスト荷重を実際に負荷している円筒ころ5は、ラジアル負荷の負荷域方向に存在する円筒ころ5と考えられる。
そこで、図7や図8のような円筒ころ5では、鍔部で挟まれた部分の軸方向長さの変化量は最悪形状の場合、振れ量に相当することとなり、非常に大きなものとなる。このような要因によるスラスト荷重の負荷能力阻害を抑制するためには、この実施形態における円筒ころ軸受では、その円筒ころ5の端面でのテーパー状クラウニング加工部10の振れを0.003mm以下とするのが望ましい。とくに、電動機など低振動、低騒音を必要とする応用面での使用の場合には、前記振れを0.002mm以下のレベルとするのが好ましい。図5に示したように、複数段のテーパー面部10a,10bでテーパー状クラウニング加工部10が形成される場合には、内径側に最も近いテーパー面部10aの振れを0.003mm以下としても良い。
この発明を適用できる軸受形式としては、内輪に鍔部を有しないNU型を始めとする、内輪片鍔付き,外輪両鍔付き(NJ型)、内輪片鍔,鍔輪組付け,外輪両鍔付き(NUP型)、内輪両鍔付き,外輪鍔なし(N型)、内輪両鍔付き,外輪片鍔つき(NF型)、内輪両鍔付き,外輪片鍔,鍔輪組付け型(NP型)等の単列型の円筒ころ軸受や、円筒ころの列数が複数の円筒ころ軸受などが挙げられる。また、保持器の無い総ころ型の円筒ころ軸受にも適用可能である。
2 外輪
3,4 軌道面
5 円筒ころ
7 内輪軌道輪
7a 鍔部
7aa 内輪鍔部の内側面(鍔面)
8 鍔輪
8a 鍔部
8aa 鍔輪鍔部の内側面(鍔面)
9 外輪
9a 鍔部
9aa 外輪鍔部の内側面(鍔面)
10 テーパー状クラウニング加工部
10a,10b テーパー面部
12 平坦部
Claims (9)
- 内輪および外輪と、これら内外輪の軌道面の間に転動自在に介在させた複数の円筒ころとを備え、前記内輪および外輪のいずれか一方または両方が、軸方向の両側または片側に鍔部を有する円筒ころ軸受であって、
前記円筒ころの外径寸法をDa としたとき、円筒ころの端面における外径縁からころ軸心側へ及ぶ径寸法0.12Da ~0.20Da の範囲の面域を、ころ軸心に垂直な平面に対して0.25°~1°の傾斜角度をなすテーパー状のクラウニング加工部とした円筒ころ軸受。 - 請求項1において、前記内輪が、一端部に鍔部を有し外周に軌道面を形成した内輪軌道輪、およびこの内輪軌道輪の他端部に隣接して配置される鍔輪からなり、前記外輪が、両端部に鍔部を有し内周に軌道面を形成した一体の部品からなり、前記内輪軌道輪の鍔部の内側面の内輪軸心に垂直な平面に対して傾斜する鍔角度をθi 、前記外輪の鍔部の内側面の外輪軸心に垂直な平面に対して傾斜する鍔角度をθo 、前記鍔輪における前記内輪軌道輪の軌道面よりも外径側に突出する鍔部の内側面の鍔輪軸心に垂直な平面に対して傾斜する鍔角度をθ1 、前記円筒ころのテーパー状クラウニング加工部の傾斜角度をθr としたとき、これらの各角度を、
(θi +θo )-2・θr =-1.25°~0.25°
および、
(θ1 +θo )-2・θr =-1.25°~0.25°
の各式が成り立つように設定した円筒ころ軸受。 - 請求項2において、前記円筒ころの端面における前記テーパー状クラウニング加工部の振れを0.003mm以下とした円筒ころ軸受。
- 請求項3において、前記円筒ころの端面における前記テーパー状クラウニング加工部を除く平坦部の端面振れを0.002mm以下とした円筒ころ軸受。
- 請求項1において、前記円筒ころの外径面をクラウニング加工部とした円筒ころ軸受。
- 請求項1において、前記円筒ころの端面における前記テーパー状クラウニング加工部は、ころ外径側に続く複数段のテーパー面部からなり、各段のテーパー面部の傾斜角度をころ外径側に近いものほど大きくした円筒ころ軸受。
- 請求項6において、前記テーパー状クラウニング加工部におけるころ内径側に最も近いテーパー面部の傾斜角度を、請求項2に記載の各式が成り立つ角度θr とした円筒ころ軸受。
- 請求項6において、前記テーパー状クラウニング加工部における隣り合うテーパー面部の傾斜角度の差を1°以下とした円筒ころ軸受。
- 請求項6において、前記テーパー状クラウニング加工部におけるころ内径側に最も近いテーパー面部の振れを0.003mm以下とした円筒ころ軸受。
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DE102015215528A1 (de) * | 2015-08-14 | 2017-02-16 | Aktiebolaget Skf | Wälzlager mit konischem Führungsbord |
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