WO2019189116A1 - Palier composite - Google Patents

Palier composite Download PDF

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Publication number
WO2019189116A1
WO2019189116A1 PCT/JP2019/012750 JP2019012750W WO2019189116A1 WO 2019189116 A1 WO2019189116 A1 WO 2019189116A1 JP 2019012750 W JP2019012750 W JP 2019012750W WO 2019189116 A1 WO2019189116 A1 WO 2019189116A1
Authority
WO
WIPO (PCT)
Prior art keywords
thrust
shaft
radial
outer ring
inner ring
Prior art date
Application number
PCT/JP2019/012750
Other languages
English (en)
Japanese (ja)
Inventor
圭吾 中山
Original Assignee
Ntn株式会社
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 Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2019189116A1 publication Critical patent/WO2019189116A1/fr

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    • 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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • 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
    • F16C19/49—Bearings with both balls and rollers

Definitions

  • This invention relates to a composite bearing in which a thrust ball bearing and a radial roller bearing are integrated.
  • a bearing for a spindle support part of a machine tool or a transmission for example, a composite bearing in which a thrust ball bearing that receives an axial load and a radial needle roller bearing that receives a radial load shown in Patent Document 1 below is integrated is adopted.
  • a composite bearing in which a thrust ball bearing that receives an axial load and a radial needle roller bearing that receives a radial load shown in Patent Document 1 below is integrated is adopted.
  • the composite type bearing is space-saving compared to the case where the thrust ball bearing and the radial roller bearing are used separately, it can contribute to the compactness of the entire apparatus.
  • an appropriate amount of preload is usually applied in the axial direction in order to suppress slippage of the rolling elements, shaft runout, and vibration in the axial direction.
  • this preload By applying this preload, the center position of the ball groove formed in each of the inner ring of the thrust ball bearing and the outer ring of the thrust ball bearing integrated with the outer ring of the radial roller bearing is aligned when the shaft rotates. Further, the inner ring of the thrust ball bearing moves in the radial direction. By this alignment, a smooth rotation state of the thrust ball bearing can be ensured.
  • the inner ring inner diameter and outer ring outer diameter dimensional tolerances and shaft dimensional tolerances are set based on predetermined industrial standards (JIS). . Further, the dimensional tolerance of the housing is not specifically described, and an appropriate tolerance range class is selected so as to fit the outer ring outer diameter of the thrust ball bearing and provide a clearance.
  • the dimensional tolerance guideline for the thrust ball bearing cannot be used as it is.
  • various standards do not specify guidelines for dimensional tolerances of composite bearings.
  • an object of the present invention is to complete the alignment even after the preload is applied and to ensure a smooth rotation in the composite bearing.
  • the thrust fitting clearance between the shaft and the thrust inner ring is A
  • the radial internal clearance between the shaft and the roller is B
  • the minimum value in the tolerance range of the thrust fitting clearance A is Amin
  • the maximum value in the tolerance range of the radial inner clearance B is Bmax
  • the total coaxiality value is the sum of the inner diameter of the thrust inner ring and the coaxiality of the inner ring ball groove and the outer diameter of the radial outer ring and the coaxiality of the outer ring ball groove.
  • a composite bearing in which Amin> Bmax + C + ⁇ is formed when the sum of the numerical values of the basic
  • the basic tolerance of the shaft may be a tolerance class 6 defined by JISB0401-1
  • a basic tolerance of the housing may be a tolerance class 7 defined by JISB0401-1.
  • Sectional view showing a composite bearing according to the present invention Sectional view showing an assembly example of the composite bearing shown in FIG. Sectional drawing which shows the state which made the axial center of the compound-type bearing shown in FIG. Sectional view showing the state before alignment Sectional view showing the state after alignment Sectional view showing the state where alignment could not be completed
  • a composite bearing 10 according to the present invention will be described with reference to FIGS.
  • This composite bearing 10 is an integral part of a thrust ball bearing that receives an axial load and a radial needle roller bearing that receives a radial load, and is generally light in the axial direction and more than a normal load in the radial direction. It is applied when each load is applied.
  • the composite bearing 10 includes a thrust inner ring 11, a thrust outer ring 12, a plurality of balls 13, a thrust retainer 14, and a radial outer ring 15 constituting a radial needle roller bearing 10b.
  • a plurality of needle rollers 16 and a radial cage 17 are provided. Further, if necessary, a dustproof cover 18 that covers the thrust ball bearing portion may be provided.
  • the rollers 16 are not limited to needle rollers, but may be cylindrical rollers.
  • the inner ring ball groove 11 a is formed in the thrust inner ring 11.
  • the coaxiality of the inner diameter of the thrust inner ring 11 and the inner ring ball groove 11a is a1.
  • the thrust outer ring 12 is formed with an outer ring ball groove 12a facing the inner ring ball groove 11a.
  • the axial end surface (end surface on the radial needle roller bearing 10 b side) of the thrust outer ring 12 is in contact with the housing 2.
  • a plurality of balls 13 are interposed between the inner ring ball groove 11a and the outer ring ball groove 12a. These balls 13 are held at predetermined intervals by a thrust holder 14.
  • the radial outer ring 15 is formed integrally with the thrust outer ring 12, and is press-fitted into the housing 2 as shown in FIG.
  • the coaxiality of the outer diameter of the radial outer ring 15 and the outer ring ball groove 12a is a2.
  • a plurality of needle rollers 16 are provided between the radial outer ring 15 and the shaft 1 inserted through the composite bearing 10. These rollers 16 are held at a predetermined interval by a radial holder 17.
  • the shaft 1 is inserted through the inner periphery of the thrust inner ring 11 and the needle rollers 16.
  • the shaft 1 is a worm shaft of a rotary table that fixes a workpiece in a machine tool such as a machining center.
  • a worm reducer may be incorporated in the rotary table for the purpose of securing rotational torque.
  • the worm shaft 1 extends horizontally in the longitudinal direction of the needle rollers 16.
  • One end of the worm shaft 1 is supported by the housing 2 via a composite bearing 10.
  • One end of the worm shaft 1 is provided with a preload mechanism 3 for applying a preload to the thrust ball bearing 10 a portion of the composite bearing 10.
  • the preload mechanism 3 is constituted by a lock nut, and a preload in the axial direction is applied to the composite bearing 10 by tightening the lock nut.
  • the thrust fitting clearance between the shaft 1 and the thrust inner ring 11 is A
  • the radial internal clearance between the shaft 1 and the needle roller 16 is B
  • the minimum value in the tolerance range of the thrust fitting gap A is Amin
  • the maximum value is Amax
  • the minimum value in the tolerance range of the radial internal gap B is Bmin
  • the maximum value is Bmax.
  • the sum of the inner diameter of the thrust inner ring 11 and the coaxiality a1 of the inner ring ball groove 11a, and the outer diameter of the radial outer ring 15 and the coaxiality a2 of the outer ring ball groove 12a is defined as a coaxiality total value C.
  • the basic tolerance of shaft 1 is the tolerance class 6 specified by the industry standard (JISB0401-1: 2016)
  • the basic tolerance of the housing 2 is the tolerance class 7 specified by the industry standard (JISB0401-1: 2016).
  • the sum of the numerical values of the basic tolerances defined by the respective tolerance classes of the shaft 1 and the housing 2 is ⁇ .
  • the basic tolerance value of the tolerance class 6 is 13 ⁇ m
  • the basic tolerance value of the tolerance class 7 is 25 ⁇ m.
  • the sum ⁇ of the basic tolerance values is 38 ⁇ m.
  • FIG. 3 shows a state where the axis of the composite bearing 10 and the axis of the shaft 1 are coaxial.
  • a uniform thrust fitting gap (A / 2) is formed between the thrust inner ring 11 and the shaft 1 in the circumferential direction, and an equal size is provided between the plurality of needle rollers 16 and the shaft 1.
  • the radial internal gap (B / 2) is formed.
  • each component is designed so as to satisfy the relational expression Amin> Bmax + C + ⁇ .
  • the processing accuracy (eccentricity) of the inner ring ball groove 11a and the outer ring ball groove 12a formed in the radial inner ring 11 and the radial outer ring 12 and the variation in the processing accuracy of the shaft 1 and the housing 2 are not affected.
  • the alignment can be completed as shown in FIG.
  • the relational expression Amax Amin + shaft basic tolerance (tolerance class 6 defined in JISB0401-1) is also defined.
  • the composite bearing 10 according to each of the above embodiments is merely an example, and in the composite bearing 10, as long as the problem of the present invention that enables alignment by a preload load can be solved, It is allowed to change the arrangement and the like as appropriate.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

La présente invention a trait à un palier composite configuré de telle sorte que, lorsque A est l'espace d'ajustement de poussée entre un arbre (1) et un anneau interne de poussée (11), B est l'espace interne radial entre l'arbre (1) et un rouleau (16), Amin est la valeur minimale dans une plage d'erreur de l'espace d'ajustement de poussée (A), Bmax est la valeur maximale dans une plage d'erreur de l'espace interne radial (B), C est la somme de la coaxialité du diamètre interne de l'anneau interne de poussée (11) et d'une rainure de bille d'anneau interne (11a) et de la coaxialité d'un anneau externe radiale (15) et d'une rainure de bille d'anneau externe (12a), et α est la somme des valeurs numériques des erreurs de base de l'arbre (1) et d'un boîtier (2), la relation Amin>Bmax +C+α est satisfaite.
PCT/JP2019/012750 2018-03-29 2019-03-26 Palier composite WO2019189116A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018064541A JP2019173917A (ja) 2018-03-29 2018-03-29 複合形軸受
JP2018-064541 2018-03-29

Publications (1)

Publication Number Publication Date
WO2019189116A1 true WO2019189116A1 (fr) 2019-10-03

Family

ID=68058948

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/012750 WO2019189116A1 (fr) 2018-03-29 2019-03-26 Palier composite

Country Status (2)

Country Link
JP (1) JP2019173917A (fr)
WO (1) WO2019189116A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113669367A (zh) * 2021-08-20 2021-11-19 重庆美沣秦安汽车驱动系统有限公司 一种用于输入轴与输出轴同轴布置时的轴承结构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB864465A (en) * 1957-08-16 1961-04-06 Schaeffler Wilhelm Improvements in or relating to adjustable-clearance antifriction bearings
JP2002317817A (ja) * 2001-04-19 2002-10-31 Nsk Ltd ラジアルころ軸受
JP2006070909A (ja) * 2004-08-31 2006-03-16 Jtekt Corp 玉軸受
US20120199777A1 (en) * 2011-02-04 2012-08-09 Honeywell International Inc. Combination bearings having improved load capacities and lifespan and valve assemblies including the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB864465A (en) * 1957-08-16 1961-04-06 Schaeffler Wilhelm Improvements in or relating to adjustable-clearance antifriction bearings
JP2002317817A (ja) * 2001-04-19 2002-10-31 Nsk Ltd ラジアルころ軸受
JP2006070909A (ja) * 2004-08-31 2006-03-16 Jtekt Corp 玉軸受
US20120199777A1 (en) * 2011-02-04 2012-08-09 Honeywell International Inc. Combination bearings having improved load capacities and lifespan and valve assemblies including the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113669367A (zh) * 2021-08-20 2021-11-19 重庆美沣秦安汽车驱动系统有限公司 一种用于输入轴与输出轴同轴布置时的轴承结构

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JP2019173917A (ja) 2019-10-10

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