JP2004162629A - Rolling bearing unit for water pump and its manufacturing method - Google Patents

Rolling bearing unit for water pump and its manufacturing method Download PDF

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Publication number
JP2004162629A
JP2004162629A JP2002330248A JP2002330248A JP2004162629A JP 2004162629 A JP2004162629 A JP 2004162629A JP 2002330248 A JP2002330248 A JP 2002330248A JP 2002330248 A JP2002330248 A JP 2002330248A JP 2004162629 A JP2004162629 A JP 2004162629A
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Prior art keywords
diameter shaft
shaft portion
bearing unit
rolling bearing
water pump
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Granted
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JP2002330248A
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JP4075576B2 (en
Inventor
Satoru Murao
悟 村尾
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Koyo Seiko Co Ltd
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Koyo Seiko Co Ltd
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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
    • F16C19/49—Bearings with both balls and 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
    • F16C2360/00—Engines or pumps
    • F16C2360/44—Centrifugal pumps

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing unit for a water pump allowing reduction of manufacturing cost and manufacturing method therefor. <P>SOLUTION: This rolling bearing unit 1 is provided with a rotary shaft 10 constituted of a large diameter shaft part 11 and a small diameter shaft part 12 and making the large diameter part 11 as an inner race, an outer race 13 externally inserted into the large diameter shaft part 11 and rolling elements 14 and 15 arranged between the large diameter shaft part 11 and the outer race 13. The rotary shaft 10 is formed by integrally cold-forging a carbon steel material. A high frequency quenching and hardening treatment is performed for at least a part in contact with the rolling elements 14 and 15 of the large diameter shaft part 11. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、ウォータポンプ用転がり軸受ユニットおよびその製造方法に関する。
【０００２】
【従来の技術】
大径軸部および小径軸部からなり大径軸部が内輪とされる回転軸と、大径軸部に外挿された外輪と、大径軸部と外輪との間に配置された転動体とを備えているウォータポンプ用転がり軸受ユニットは、従来より、よく知られている（特許文献１，２および３参照）。回転軸は、例えば、ＪＩＳ ＳＵＪ−２やＳＵＳ４４０Ｃ材を使用し、これを旋削することによりその段付き加工（大径軸部および小径軸部の成形）が行われていた。
【０００３】
【特許文献１】
実公平７−８９１４号公報
【０００４】
【特許文献２】
特開平８−１００６５１号公報
【０００５】
【特許文献３】
実開平４−１１３７９８号公報
【０００６】
【発明が解決しようとする課題】
上記従来のウォータポンプ用転がり軸受ユニットでは、ＳＵＪ−２を旋削することによって段付き加工していることから、旋削加工工程が長くなるとともに、材料費も高くつき、製造コストが高くなるという問題があった。また、旋削後の回転軸の全面に焼入処理（ズブ焼き）を施していることから、その点でも製造コストが増加していた。
【０００７】
この発明の目的は、製造コストの減少が可能なウォータポンプ用転がり軸受ユニットおよびその製造方法を提供することにある。
【０００８】
【課題を解決するための手段および発明の効果】
この発明によるウォータポンプ用転がり軸受ユニットは、大径軸部および小径軸部からなり大径軸部が内輪とされる回転軸と、大径軸部に外挿された外輪と、大径軸部と外輪との間に配置された転動体とを備えているウォータポンプ用転がり軸受ユニットにおいて、回転軸は、炭素鋼材が一体的に冷鍛加工されることにより形成されており、大径軸部のうちの少なくとも転動体に接触する部分に、高周波焼入硬化処理が施されていることを特徴とするものである。
【０００９】
炭素鋼としては、例えば、ＪＩＳ規格Ｓ５５Ｃが使用されるが、Ｓ４５Ｃ、ＳＡＥ１０５５やＳＡＥ１０４５等でもよい。
【００１０】
高周波焼入硬化処理が施される部分は、転動体に接触する部分だけであってもよく、また、転動体に接触する部分およびシールに接触する部分とされてもよい。
【００１１】
この発明のウォータポンプ用転がり軸受ユニットによると、段付き加工が旋削でなく冷鍛加工により行われているので、旋削を行うのは軌道溝などの浅い溝だけでよく、旋削時間が大幅に減少するとともに、旋削屑となる材料も減少し、これによって全体の加工時間および材料費を少なくすることができる。また、炭素鋼は、ＳＵＪ−２よりも安価であるので、より一層材料費が低減でき、しかも、熱処理がズブ焼きでなく必要部分のみの高周波焼入であるので、加工費が安くかつ処理時間も短時間であり、熱処理費用も低減することができ、軸受ユニットの製造コストをより一層少なくすることができる。
【００１２】
この発明によるウォータポンプ用転がり軸受ユニットの製造方法は、大径軸部および小径軸部からなり大径軸部が内輪とされる回転軸と、大径軸部に外挿された外輪と、大径軸部と外輪との間に配置された転動体とを備えているウォータポンプ用転がり軸受ユニットを製造する方法であって、炭素鋼材を一体的に冷鍛加工して回転軸を得る工程と、大径軸部のうちの転動体に接触する部分に高周波焼入硬化処理を施す工程とを備えていることを特徴とするものである。
【００１３】
この発明のウォータポンプ用転がり軸受ユニットの製造方法によると、段付き加工が旋削でなく冷鍛加工により行われるので、旋削を行うのは軌道溝などの浅い溝だけでよく、旋削時間が大幅に減少するとともに、旋削屑となる材料も減少し、これによって全体の加工時間および材料費を少なくすることができる。また、炭素鋼は、ＳＵＪ−２よりも安価であるので、より一層材料費が低減でき、しかも、熱処理がズブ焼きでなく必要部分のみの高周波焼入であるので、熱処理費用も低減することができ、全体の加工時間および材料費をより一層少なくすることができる。
【００１４】
【発明の実施の形態】
この発明の実施の形態を、以下図面を参照して説明する。以下の説明において、左右は、図の左右をいうものとする。
【００１５】
図１および図２は、この発明によるウォータポンプ用転がり軸受ユニットおよびウォータポンプの実施形態を示している。
【００１６】
ウォータポンプ用転がり軸受ユニット（１）は、図２に示すように、大径軸部（１１）および小径軸部（１２）からなり大径軸部（１１）が内輪とされる段付きの回転軸（１０）と、大径軸部（１１）に外挿されてハウジング（２）に固定される外輪（１３）と、大径軸部（１１）と外輪（１３）との間に配置されたころ（１４）および玉（１５）とを有している。回転軸（１０）の大径軸部側端部（外端部）には、プーリ取付用のシートフランジ（３）が圧入されて、これにプーリベルト（４）が取り付けられている。回転軸（１０）の小径軸部側端部（内端部）には、インペラ（５）が取り付けられている。小径軸部（１２）には、これとハウジング（２）との間をシールするメカニカルシール（６）が設けられている。
【００１７】
大径軸部（１１）には、玉（１５）を案内する軌道溝（１６）が形成されている。大径軸部（１１）および小径軸部（１２）からなる段付きの回転軸（１０）は、ＪＩＳ規格Ｓ５５Ｃの炭素鋼材が一体的に冷鍛加工されることにより形成されている。軌道溝（１６）は、その後に旋削加工することにより形成されている。さらに、大径軸のうちのころ（１４）および玉（１５）に接触する部分（図１に斜線を施している部分）には、高周波焼入硬化処理が施されている。回転軸（１０）は、冷鍛加工によって、所要の強靱さを付与され、回転軸（１０）のうちのころ（１４）および玉（１５）に接触する部分に高周波焼入硬化処理が施されることにより、軸受として必要な耐摩耗性および転がり特性が付与される。
【００１８】
上記高周波焼入硬化処理は、これをシール（１７）（１８）の摺動部分に相当する領域にも施すことにより、シール（１７）（１８）摺動による摩耗を低減し、密封性能を向上することもできる。そして、これらシール（１７）（１８）摺動領域と転動体（１４）（１５）に接触する部分以外への高周波焼入硬化処理を行わないことにより、熱処理費用を低減することができる。
【００１９】
なお、上記の実施形態では、転動体としてころ（１４）と玉（１５）とが組み合わされて使用されているが、ころ（１４）に代えて玉としてももちろんよい。
【図面の簡単な説明】
【図１】この発明によるウォータポンプ用転がり軸受ユニットの回転軸を示す図である。
【図２】ウォータポンプ用転がり軸受ユニットの縦断面図である。
【符号の説明】
（１） ウォータポンプ用転がり軸受ユニット
（１０） 回転軸
（１１） 大径軸部
（１２） 小径軸部
（１３） 外輪
（１４） 転動体[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rolling bearing unit for a water pump and a method of manufacturing the same.
[0002]
[Prior art]
A rotating shaft composed of a large-diameter shaft portion and a small-diameter shaft portion and having a large-diameter shaft portion as an inner ring, an outer ring extrapolated to the large-diameter shaft portion, and a rolling element disposed between the large-diameter shaft portion and the outer ring Rolling bearing units for water pumps having the following are well known in the related art (see Patent Documents 1, 2, and 3). For example, a JIS SUJ-2 or SUS440C material was used as the rotating shaft, and the stepped processing (forming of the large-diameter shaft portion and the small-diameter shaft portion) was performed by turning the material.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 7-8914
[Patent Document 2]
JP-A-8-100651
[Patent Document 3]
Japanese Utility Model Application Laid-Open No. 4-113798 [0006]
[Problems to be solved by the invention]
In the rolling bearing unit for a conventional water pump described above, since the step processing is performed by turning the SUJ-2, the turning process becomes longer, the material cost increases, and the manufacturing cost increases. there were. Further, since the entire surface of the rotating shaft after the turning is subjected to quenching (submerging), the manufacturing cost is also increased in that respect.
[0007]
An object of the present invention is to provide a rolling bearing unit for a water pump and a method of manufacturing the same, which can reduce the manufacturing cost.
[0008]
Means for Solving the Problems and Effects of the Invention
A rolling bearing unit for a water pump according to the present invention includes a rotating shaft including a large-diameter shaft portion and a small-diameter shaft portion, the large-diameter shaft portion being an inner ring, an outer ring externally inserted into the large-diameter shaft portion, and a large-diameter shaft portion. And a rolling element disposed between the outer ring and the outer ring, wherein the rotating shaft is formed by integrally cold forging a carbon steel material, and a large diameter shaft portion. Wherein at least a portion that contacts the rolling element is subjected to induction hardening treatment.
[0009]
As the carbon steel, for example, JIS standard S55C is used, but S45C, SAE1055, SAE1045, or the like may be used.
[0010]
The portion to be subjected to the induction hardening treatment may be only the portion that contacts the rolling element, or may be the portion that contacts the rolling element and the portion that contacts the seal.
[0011]
According to the rolling bearing unit for a water pump of the present invention, since the stepped processing is performed by cold forging rather than by turning, only the shallow grooves such as raceway grooves need to be turned, and the turning time is greatly reduced. At the same time, the amount of material to be turned is also reduced, thereby reducing the overall processing time and material cost. In addition, carbon steel is cheaper than SUJ-2, so that the material cost can be further reduced. In addition, since the heat treatment is induction hardening only for the necessary parts instead of subbing, the processing cost is low and the processing time is low. The heat treatment cost can be reduced, and the manufacturing cost of the bearing unit can be further reduced.
[0012]
The method of manufacturing a rolling bearing unit for a water pump according to the present invention includes a rotating shaft including a large-diameter shaft portion and a small-diameter shaft portion, the large-diameter shaft portion being an inner ring, an outer ring externally inserted in the large-diameter shaft portion, and A method for manufacturing a rolling bearing unit for a water pump comprising a rolling element disposed between a radial shaft portion and an outer ring, wherein a step of obtaining a rotating shaft by integrally cold forging a carbon steel material. Subjecting a portion of the large-diameter shaft portion that comes into contact with the rolling element to an induction hardening treatment.
[0013]
According to the method for manufacturing a rolling bearing unit for a water pump of the present invention, since the stepped machining is performed by cold forging rather than by turning, the turning can be performed only in a shallow groove such as a raceway groove, and the turning time is greatly reduced. Along with the reduction, the amount of material to be turned is also reduced, thereby reducing the overall processing time and material costs. Further, since carbon steel is cheaper than SUJ-2, the material cost can be further reduced. In addition, since the heat treatment is induction hardening of only necessary parts instead of subduction, the heat treatment cost can be reduced. As a result, the overall processing time and material cost can be further reduced.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the following description, left and right refer to the left and right of the figure.
[0015]
1 and 2 show an embodiment of a rolling bearing unit for a water pump and a water pump according to the present invention.
[0016]
As shown in FIG. 2, the rolling bearing unit (1) for a water pump includes a large-diameter shaft portion (11) and a small-diameter shaft portion (12), and has a stepped rotation in which the large-diameter shaft portion (11) is an inner ring. A shaft (10), an outer ring (13) externally inserted into the large-diameter shaft portion (11) and fixed to the housing (2), and disposed between the large-diameter shaft portion (11) and the outer ring (13). It has a roller (14) and a ball (15). A pulley mounting sheet flange (3) is press-fitted into the large-diameter shaft-side end (outer end) of the rotary shaft (10), and a pulley belt (4) is mounted thereon. An impeller (5) is attached to the small-diameter shaft-side end (inner end) of the rotating shaft (10). The small diameter shaft portion (12) is provided with a mechanical seal (6) for sealing between the small diameter shaft portion (12) and the housing (2).
[0017]
A track groove (16) for guiding the ball (15) is formed in the large-diameter shaft portion (11). The stepped rotary shaft (10) including the large-diameter shaft portion (11) and the small-diameter shaft portion (12) is formed by integrally cold-forging a JIS-standard S55C carbon steel material. The raceway groove (16) is formed by subsequently turning. Further, a portion of the large-diameter shaft that comes into contact with the roller (14) and the ball (15) (a portion shaded in FIG. 1) is subjected to induction hardening treatment. The rotating shaft (10) is provided with required toughness by cold forging, and a portion of the rotating shaft (10) that comes into contact with the rollers (14) and the balls (15) is subjected to induction hardening treatment. Thereby, the wear resistance and the rolling characteristics required for the bearing are imparted.
[0018]
The induction hardening treatment is also applied to a region corresponding to a sliding portion of the seals (17) and (18), thereby reducing abrasion due to sliding of the seals (17) and (18) and improving sealing performance. You can also. The heat treatment cost can be reduced by not performing the induction quench hardening treatment on portions other than the contact areas between the sliding regions of the seals (17) and (18) and the rolling elements (14) and (15).
[0019]
In the above-described embodiment, the rollers (14) and the balls (15) are used in combination as rolling elements, but may be balls instead of the rollers (14).
[Brief description of the drawings]
FIG. 1 is a view showing a rotating shaft of a rolling bearing unit for a water pump according to the present invention.
FIG. 2 is a longitudinal sectional view of a rolling bearing unit for a water pump.
[Explanation of symbols]
(1) Rolling bearing unit for water pump (10) Rotary shaft (11) Large diameter shaft (12) Small diameter shaft (13) Outer ring (14) Rolling element

Claims (2)

大径軸部および小径軸部からなり大径軸部が内輪とされる回転軸と、大径軸部に外挿された外輪と、大径軸部と外輪との間に配置された転動体とを備えているウォータポンプ用転がり軸受ユニットにおいて、
回転軸は、炭素鋼材が一体的に冷鍛加工されることにより形成されており、大径軸部のうちの少なくとも転動体に接触する部分に、高周波焼入硬化処理が施されていることを特徴とするウォータポンプ用転がり軸受ユニット。A rotating shaft composed of a large-diameter shaft portion and a small-diameter shaft portion and having a large-diameter shaft portion as an inner ring, an outer ring extrapolated to the large-diameter shaft portion, and a rolling element disposed between the large-diameter shaft portion and the outer ring. In a water pump rolling bearing unit comprising:
The rotating shaft is formed by integrally cold forging a carbon steel material, and at least a portion of the large-diameter shaft portion that contacts the rolling element is subjected to induction hardening treatment. Characteristic rolling bearing unit for water pumps. 大径軸部および小径軸部からなり大径軸部が内輪とされる回転軸と、大径軸部に外挿された外輪と、大径軸部と外輪との間に配置された転動体とを備えているウォータポンプ用転がり軸受ユニットを製造する方法であって、
炭素鋼材を一体的に冷鍛加工して回転軸を得る工程と、大径軸部のうちの転動体に接触する部分に高周波焼入硬化処理を施す工程とを備えていることを特徴とするウォータポンプ用転がり軸受ユニットの製造方法。A rotating shaft composed of a large-diameter shaft portion and a small-diameter shaft portion and having a large-diameter shaft portion as an inner ring, an outer ring extrapolated to the large-diameter shaft portion, and a rolling element disposed between the large-diameter shaft portion and the outer ring. A method for manufacturing a rolling bearing unit for a water pump, comprising:
A step of obtaining a rotating shaft by integrally cold forging a carbon steel material, and a step of performing an induction hardening treatment on a portion of the large-diameter shaft portion that contacts a rolling element. A method for manufacturing a rolling bearing unit for a water pump.
JP2002330248A 2002-11-14 2002-11-14 Method for manufacturing rolling bearing unit for water pump Expired - Fee Related JP4075576B2 (en)

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JP4075576B2 JP4075576B2 (en) 2008-04-16

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006098168A1 (en) * 2005-03-15 2006-09-21 Thk Co., Ltd. Rolling device and method for manufacture same
JP2007263266A (en) * 2006-03-29 2007-10-11 Jtekt Corp Rolling bearing device for supporting pinion shaft
KR100808329B1 (en) 2003-12-10 2008-02-27 샤프 가부시키가이샤 Liquid crystal display
JP2008121775A (en) * 2006-11-10 2008-05-29 Nsk Ltd Water pump rotating shaft manufacturing method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100808329B1 (en) 2003-12-10 2008-02-27 샤프 가부시키가이샤 Liquid crystal display
WO2006098168A1 (en) * 2005-03-15 2006-09-21 Thk Co., Ltd. Rolling device and method for manufacture same
JP4949234B2 (en) * 2005-03-15 2012-06-06 Ｔｈｋ株式会社 Rolling exercise apparatus and manufacturing method thereof
JP2007263266A (en) * 2006-03-29 2007-10-11 Jtekt Corp Rolling bearing device for supporting pinion shaft
JP4535018B2 (en) * 2006-03-29 2010-09-01 株式会社ジェイテクト Roller bearing device for pinion shaft support
US7811000B2 (en) 2006-03-29 2010-10-12 Jtekt Corporation Rolling bearing device for supporting pinion shaft
JP2008121775A (en) * 2006-11-10 2008-05-29 Nsk Ltd Water pump rotating shaft manufacturing method
JP4609417B2 (en) * 2006-11-10 2011-01-12 日本精工株式会社 Manufacturing method of rotary shaft for water pump

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