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JP2004232683A - Ball bearing device for water pump - Google Patents

Ball bearing device for water pump Download PDF

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Publication number
JP2004232683A
JP2004232683A JP2003019833A JP2003019833A JP2004232683A JP 2004232683 A JP2004232683 A JP 2004232683A JP 2003019833 A JP2003019833 A JP 2003019833A JP 2003019833 A JP2003019833 A JP 2003019833A JP 2004232683 A JP2004232683 A JP 2004232683A
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JP
Japan
Prior art keywords
ball bearing
water pump
side member
clearance
cylindrical
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.)
Pending
Application number
JP2003019833A
Other languages
Japanese (ja)
Inventor
Satoru Murao
悟 村尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koyo Seiko Co Ltd
Original Assignee
Koyo Seiko Co Ltd
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 Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP2003019833A priority Critical patent/JP2004232683A/en
Publication of JP2004232683A publication Critical patent/JP2004232683A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30Parts of ball or roller bearings
    • F16C33/58Raceways; Race rings
    • F16C33/583Details of specific parts of races
    • F16C33/585Details of specific parts of races of raceways, e.g. ribs to guide the rollers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/70Diameters; Radii
    • F16C2240/76Osculation, i.e. relation between radii of balls and raceway groove
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00Engines or pumps
    • F16C2360/44Centrifugal pumps

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball bearing device for a water pump capable of precluding noise emission, short lifetime, slipping-off of a belt by lessening the axial clearance and the angular clearance, not requiring lessening of the initial radial clearance of a ball bearing. <P>SOLUTION: The ball bearing device for the water pump is configured so that the ball bearing 5 is interposed between a cylindrical part 2a of a stationary side member 2 on the inside and a cylindrical pulley part 3c of a rotary side member 3 on the outside, both being formed from steel plate by press working, wherein the radius of curvature of the outer race of the ball bearing 5 is 50.5-51.5% of the ball diameter. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
この発明は、自動車用エンジンの冷媒循環などに使用される水ポンプ用玉軸受装置に関する。
【0002】
【従来の技術】
水ポンプは、シャフト、プーリおよびインペラを含む回転部分が固定部分であるハウジングに対して回転するようになっており、従来は、回転部分のシャフトの部分が2列の玉軸受によってハウジングに回転支持されていた。
【0003】
近年、水ポンプの小型化、軽量化、低コスト化を図るため、回転部分をプレス加工により成形した部材により構成し、プレス加工により成形した固定側部材を固定部分に固定し、内側の固定側部材の円筒部に対し、外側の回転部分の円筒状のプーリ部を1列の玉軸受で回転支持するものが提案されている(特許文献1・特許文献2)。
【0004】
【特許文献1】
特開2002−089486号公報
【0005】
【特許文献2】
特開2002−155893号公報
【0006】
【発明が解決しようとする課題】
上記の従来の水ポンプでは、玉軸受の軌道輪は、脱落を防止するため、円筒部に圧入により固定されている。
【0007】
水ポンプに使用される玉軸受については、プーリ部にかけられたベルトのばたつき、せり出しなどを抑えるとともに、メカニカルシールのシール性を十分に発揮させるために、アキシアルすきまおよび角すきまを小さくする必要がある。一方、玉軸受の異音防止、寿命の面より、玉軸受のすきまが負にならないようにすることが必要である。ところが、上記の従来の水ポンプの場合、円筒部がプレス成形されたもので、精度が悪く、寸法ばらつきが大きいため、次に説明するように、組み込み後の軸受すきまの調整が困難である。
【0008】
軌道輪を円筒部に圧入すると、軌道輪が変形して、すきまが変化するが、円筒部の寸法ばらつきが大きいため、玉軸受の初期ラジアルすきまが同じであっても、組み込み後のすきまにばらつきが生じる。玉軸受のアキシアルすきまおよび角すきまを小さくするには、組み込み前の初期ラジアルすきまを小さくすればよいが、初期ラジアルすきまをあまり小さくすると、円筒部の寸法のばらつきのために、すきまが負になって、とくにグリースが硬い低温雰囲気において軸受転がり音が増加することがある。これを避けるためには、円筒部の寸法ばらつきを考慮して、玉軸受の初期ラジアルすきまをある程度大きくする必要があるが、そうすると、玉軸受のアキシアルすきまおよび角すきまが過大になって、異音、短寿命、プーリ部からのベルトの脱落などの問題が生じることがある。
【0009】
この発明の目的は、上記の問題を解決し、玉軸受の初期ラジアルすきまを小さくしなくても、アキシアルすきまおよび角すきまを小さくして、異音、短寿命、ベルトの脱落などを防止できる水ポンプ用玉軸受装置を提供することにある。
【0010】
【課題を解決するための手段および発明の効果】
この発明による水ポンプ用玉軸受装置は、ともに金属板のプレス加工により形成された内側の固定側部材の円筒部と外側の回転側部材の円筒部の間に玉軸受が介在させられている水ポンプにおいて、玉軸受の外輪軌道の曲率半径が玉径(直径)の50.5%〜51.5%であることを特徴とするものである。
【0011】
水ポンプなどに使用される従来の標準設計の玉軸受では、玉径に対する外輪軌道の曲率半径の比率は52.5%〜53.5%であるのに対し、この発明では、50.5%〜51.5%である。玉径に対する内輪軌道の曲率半径の比率は、従来と同じでよく、たとえば、51.5%〜52.5%である。
【0012】
この発明の水ポンプ用玉軸受装置によれば、玉径に対する外輪軌道の曲率半径の比率が51.5%〜52.5%であって、従来のものより小さいので、玉軸受の初期ラジラルすきまを小さくしなくても、アキシアルすきまおよび角すきまを小さくすることができ、したがって、過大なすきまによる異音、短寿命、ベルトの脱落などを防止することができる。
【0013】
この発明の水ポンプ用玉軸受装置において、たとえば、回転側部材の円筒部がプーリ部である。
【0014】
このようにすれば、プーリ部の直径が玉軸受の外径より少し大きくなるだけで、回転部分を小型化することができる。
【0015】
上記の水ポンプ用玉軸受装置において、たとえば、回転側部材が、一端が閉鎖して他端が開口した円筒状のシャフト部と、シャフト部の開口端部の外側に一体に形成されたフランジ部と、フランジ部の外周部のシャフト部閉鎖端側に形成された円筒状のプーリ部とからなり、シャフト部の閉鎖端部に、インペラの円筒部が圧入により固定されている。
【0016】
このようにすれば、回転側部材とインペラを含む回転部分を軽量化することができる。
【0017】
たとえば、回転側部材は、大径円筒部であるプーリ部と、プーリ部の一端部の内側に一体に形成されたフランジ部と、フランジ部の内周部に一体に形成された小径円筒部とからなり、小径円筒部がシャフトの一端部に圧入により固定され、プーリ部の内周に玉軸受の外輪が圧入により固定される。その場合、シャフト部とインペラがプレス加工により一体に形成されてもよい。
【0018】
このようにした場合も、プーリ部、シャフト部およびインペラを含む回転部分を軽量化することができる。
【0019】
たとえば、回転側部材において、内周に軸受の外輪が固定される小径の円筒部の外側に、ベルトをかけるためのプーリ部がフランジ部を介して一体に形成される。
【0020】
このようにすれば、プーリ部の外径が玉軸受の外径に制約されることがなく、プーリ部の外径の設定の自由度が大きくなる。
【0021】
【発明の実施の形態】
以下、図面を参照して、この発明の実施形態について説明する。
【0022】
図1は、水ポンプの全体構成を示している。以下の説明において、図1の左右を左右とする。
【0023】
図1に示すように、水ポンプは、固定部分であるハウジング(1)、ハウジング(1)に固定された固定側部材(2)、回転部分を構成する回転側部材(3)およびインペラ(4)、固定側部材(2)に対して回転側部材(3)を回転支持する1列の密封型玉軸受(5)、ならびに固定側部材(2)と回転側部材(3)の間をシールするシール部材(6)を備えている。
【0024】
ハウジング(1)には、左端が開口した水室(10)が設けられている。固定側部材(2)は、冷間圧延鋼板やSPCCなどの鋼板をプレス成形することにより一体に形成されたものであり、左右方向の水平軸を中心とする小径円筒部(2a)、円筒部(2a)の右端部の外側に一体に形成された内側フランジ部(2b)、小径円筒部(2a)と同心となるようにフランジ部(2b)の外周部の右側に一体に形成された大径円筒部(2c)、および円筒部(2c)の右端部の外側に一体に形成された外側フランジ部(2d)よりなる。そして、外側フランジ部(2d)が、水室(10)の開口部の周囲のハウジング(1)の左端面にシール(11)を介して固定されている。
【0025】
回転側部材(3)は、固定側部材(2)と同様の鋼板をプレス成形することにより一体に形成されたものであり、左右方向の水平軸を中心とし右端部が閉鎖して左端部が開口した比較的長い有底円筒状のシャフト部(3a)、シャフト部(3a)の左端部の外側に一体に形成されフランジ部(3b)、およびシャフト部(3a)と同心となるようにフランジ部(3b)の外周部の右側に一体に形成された円筒状のプーリ部(円筒部)(3c)よりなる。回転側部材(3)は、固定側部材(2)と同心となるように配置されている。シャフト部(3a)は、固定側部材(2)の小径円筒部(2a)の内側に左側から挿入され、これらの間にシール部材(6)が介在させられている。シャフト部(3a)の右端部は、ハウジング(1)の水室(10)内に位置している。フランジ部(3b)は、固定側部材(2)の小径円筒部(2a)の左端部に近接している。プーリ部(3c)は、固定側部材(2)の小径円筒部(2a)の外側に位置しており、これらの間に玉軸受(5)が介在させられている。回転側部材(3)のフランジ部(3b)には、シール部材(6)を通過してきた水(水蒸気)を逃がすための複数の開口(12)が形成されている。図示は省略したが、プーリ部(3c)には、回転側部材(3)に回転駆動力を伝達するためのベルトがかけられる。
【0026】
インペラ(4)は、鋼板をプレス成形することにより一体に形成されたものであり、左右方向の水平軸を中心とし右端部が閉鎖して左端部が開口した比較的短い有底円筒部(4a)、円筒部(4a)の左端部の外側に一体に形成されたフランジ部(4b)、およびフランジ部(4b)の右側に一体に形成された複数の羽根(4c)よりなる。インペラ(4)の円筒部(4a)が、回転側部材(3)のシャフト部(3a)の右端部外側に右側から圧入されて固定されており、インペラ(4)全体がハウジング(1)の水室(10)内に位置している。
【0027】
玉軸受(5)は深みぞ玉軸受であり、SUJ2などの軸受鋼製の内輪(5a)、外輪(5b)、およびこれらの間に介在させられた複数の玉(5c)を備えている。内輪(5a)は、固定側部材(2)の小径円筒部(2a)の外周に圧入により固定されている。外輪(5b)は、回転側部材(3)のプーリ部(3c)の内周に圧入により固定されている。
【0028】
シール部材(6)は、詳細な説明は省略したが、公知のメカニカルシールであり、内周側部分が回転側部材(3)のシャフト部(3a)の外周に圧入により固定され、外周側部分が固定側部材(2)の小径円筒部(2a)の内周に圧入により固定されている。
【0029】
図2は、玉軸受(5)の部分を拡大して示したものである。
【0030】
図2において、R1は内輪(5a)の軌道(13)の曲率半径、R2は外輪(5b)の軌道(14)の曲率半径、Dは玉(5c)の直径(玉径)を表わしている。
【0031】
上記の水ポンプでは、玉径Dに対する外輪軌道(14)の曲率半径R1の比率A1(=R1/D)は50.5%〜51.5%である。また、玉径Dに対する内輪軌道(13)の曲率半径R2比率A2(=R2/D)は51.5%〜52.5%である。
【0032】
上記の水ポンプでは、プーリ部(3c)にかけられたベルトにより、回転側部材(3)およびインペラ(4)が回転させられ、玉軸受(5)の外輪(5b)が内輪(5a)に対して回転する。
【0033】
玉軸受(5)における上記比率A1が51.5%〜52.5%であって、従来のものより小さいので、玉軸受(5)の初期ラジラルすきまを小さくしなくても、アキシアルすきまおよび角すきまを小さくすることができ、したがって、過大なすきまによる異音、短寿命、ベルトの脱落などを防止することができる。また、内輪軌道(13)の曲率半径R1と外輪軌道(14)の曲率半径R2が互いに異なるので、焼付のおそれがない。
【0034】
図3および図4は、上記の水ポンプに使用されている玉軸受(5)と従来の標準設計の玉軸受について、初期ラジアルすきまとアキシアルすきまおよび角すきまとの関係を調べた結果を示すグラフであり、図3はアキシアルすきまとの関係、図4は角すきまとの関係を示している。対象とした玉軸受は型番6004のものである。また、図3および図4において、○印は上記の水ポンプに使用されている玉軸受(5)の場合、×印は従来の玉軸受の場合を示している。従来の玉軸受の場合、比率A1は52.5%〜53.5%、比率A2は51.5%〜52.5%である。これに対し、上記の水ポンプに使用されている玉軸受(5)の場合、上記のように、比率A1は50.5%〜51.5%、比率A2は51.5%〜52.5%である。
【0035】
図3および図4より明らかなように、上記の水ポンプで使用されている玉軸受(5)では、従来の玉軸受に比べて、初期ラジアルすきまが同じであっても、アキシアルすきまおよび角すきまが20%以上小さくなり、初期ラジアルすきまが大きいほどその効果が大きい。
【0036】
上記実施形態では、シャフト部とプーリ部が一体にプレス成形されて回転側部材を構成しているが、プーリ部だけで回転側部材を構成するようにしてもよい。その場合、たとえば、回転側部材は、大径円筒部であるプーリ部と、プーリ部の一端部の内側に一体に形成されたフランジ部と、フランジ部の内周部に一体に形成された小径円筒部とからなり、小径円筒部がシャフトの一端部に圧入により固定され、プーリ部の内周に玉軸受の外輪が圧入により固定される。その場合、シャフト部とインペラがプレス加工により一体に形成されてもよい。
【0037】
また、上記実施形態では、玉軸受(5)の外輪(5b)が固定される円筒部がプーリ部(3c)となっているが、玉軸受の外輪が固定される小径の円筒部の外側に、ベルトをかけるためのプーリ部がフランジ部を介して一体に形成されてもよい。
【図面の簡単な説明】
【図1】図1は、この発明の実施形態を示す水ポンプの主要部の縦断面図である。
【図2】図2は、図1の玉軸受の一部を拡大して示す拡大縦断面図である。
【図3】図3は、この発明による水ポンプの玉軸受と従来の標準設計の玉軸受について、初期ラジアルすきまとアキシアルすきまとの関係を調べた結果を示すグラフである。
【図4】図4は、この発明による水ポンプの玉軸受と従来の標準設計の玉軸受について、初期ラジアルすきまと角すきまとの関係を調べた結果を示すグラフである。
【符号の説明】
(2) 固定側部材
(2a) 円筒部
(3) 回転側部材
(3a) シャフト部
(3b) フランジ部
(3c) プーリ部
(4) インペラ
(5) 玉軸受
[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump ball bearing device used for, for example, circulating a refrigerant in an automobile engine.
[0002]
[Prior art]
In the water pump, a rotating part including a shaft, a pulley, and an impeller is adapted to rotate with respect to a housing in which the rotating part is a fixed part. It had been.
[0003]
In recent years, in order to reduce the size, weight and cost of the water pump, the rotating part is composed of a member formed by press working, and the fixed side member formed by press working is fixed to the fixed part, and the inner fixed side There has been proposed a structure in which a cylindrical pulley portion of an outer rotating portion is rotatably supported by a single row of ball bearings with respect to a cylindrical portion of a member (Patent Documents 1 and 2).
[0004]
[Patent Document 1]
JP-A-2002-089486
[Patent Document 2]
JP 2002-155893 A
[Problems to be solved by the invention]
In the above-described conventional water pump, the race of the ball bearing is fixed to the cylindrical portion by press fitting in order to prevent the bearing ring from falling off.
[0007]
For ball bearings used in water pumps, it is necessary to reduce the axial clearance and angular clearance in order to suppress the flapping and protrusion of the belt applied to the pulley, and to make the mechanical seal sufficiently effective. . On the other hand, it is necessary to prevent the clearance of the ball bearing from becoming negative from the viewpoint of preventing abnormal noise and life of the ball bearing. However, in the case of the above-mentioned conventional water pump, since the cylindrical portion is press-formed, the accuracy is poor, and the dimensional variation is large, it is difficult to adjust the clearance of the bearing after as described below.
[0008]
When the bearing ring is pressed into the cylindrical part, the bearing ring is deformed and the clearance changes.However, the dimensional variation of the cylindrical part is large, so even if the initial radial clearance of the ball bearing is the same, the clearance after installation will vary. Occurs. To reduce the axial clearance and angular clearance of a ball bearing, the initial radial clearance before assembly can be reduced.However, if the initial radial clearance is too small, the clearance will be negative due to variations in the dimensions of the cylindrical part. In particular, the rolling noise of the bearing may increase particularly in a low-temperature atmosphere where the grease is hard. In order to avoid this, it is necessary to increase the initial radial clearance of the ball bearing to some extent in consideration of the dimensional variation of the cylindrical part.However, the axial clearance and the angular clearance of the ball bearing become excessive, resulting in abnormal noise. In such a case, problems such as a short life, a belt falling off the pulley, and the like may occur.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems, and to reduce axial clearance and angular clearance without reducing the initial radial clearance of a ball bearing, thereby preventing noise, short life, and belt dropout. It is to provide a ball bearing device for a pump.
[0010]
Means for Solving the Problems and Effects of the Invention
In the ball bearing device for a water pump according to the present invention, a water bearing in which a ball bearing is interposed between a cylindrical portion of an inner fixed side member and a cylindrical portion of an outer rotating side member both formed by pressing a metal plate. In the pump, the radius of curvature of the outer raceway of the ball bearing is 50.5% to 51.5% of the ball diameter (diameter).
[0011]
In a conventional standard design ball bearing used for a water pump or the like, the ratio of the radius of curvature of the outer raceway to the ball diameter is 52.5% to 53.5%. 551.5%. The ratio of the radius of curvature of the inner raceway to the ball diameter may be the same as the conventional one, and is, for example, 51.5% to 52.5%.
[0012]
According to the water pump ball bearing device of the present invention, the ratio of the radius of curvature of the outer raceway to the ball diameter is 51.5% to 52.5%, which is smaller than the conventional one, so that the initial radial clearance of the ball bearing. The axial clearance and the angular clearance can be reduced without reducing the clearance, and therefore, abnormal noise, short life, and belt drop due to excessive clearance can be prevented.
[0013]
In the ball bearing device for a water pump of the present invention, for example, the cylindrical portion of the rotating member is a pulley portion.
[0014]
With this configuration, the rotating portion can be reduced in size only by making the diameter of the pulley portion slightly larger than the outer diameter of the ball bearing.
[0015]
In the above-described water pump ball bearing device, for example, the rotation-side member has a cylindrical shaft portion having one end closed and the other end opened, and a flange portion integrally formed outside the open end of the shaft portion. And a cylindrical pulley portion formed on the outer peripheral portion of the flange portion on the closed end side of the shaft portion. The cylindrical portion of the impeller is fixed to the closed end portion of the shaft portion by press fitting.
[0016]
With this configuration, the weight of the rotating portion including the rotating member and the impeller can be reduced.
[0017]
For example, the rotation-side member includes a pulley portion which is a large-diameter cylindrical portion, a flange portion integrally formed inside one end of the pulley portion, and a small-diameter cylindrical portion integrally formed on an inner peripheral portion of the flange portion. The small diameter cylindrical portion is fixed to one end of the shaft by press fitting, and the outer ring of the ball bearing is fixed to the inner periphery of the pulley portion by press fitting. In that case, the shaft portion and the impeller may be formed integrally by press working.
[0018]
Also in this case, the weight of the rotating portion including the pulley portion, the shaft portion, and the impeller can be reduced.
[0019]
For example, a pulley portion for applying a belt is integrally formed via a flange portion on the outer side of a small-diameter cylindrical portion to which an outer ring of a bearing is fixed on an inner periphery of the rotating side member.
[0020]
With this configuration, the outer diameter of the pulley portion is not restricted by the outer diameter of the ball bearing, and the degree of freedom in setting the outer diameter of the pulley portion is increased.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 shows the overall configuration of the water pump. In the following description, the left and right in FIG.
[0023]
As shown in FIG. 1, the water pump includes a housing (1) as a fixed part, a fixed member (2) fixed to the housing (1), a rotating member (3) constituting a rotating part, and an impeller (4). ), A row of hermetically sealed ball bearings (5) for rotatably supporting the rotating member (3) with respect to the fixed member (2), and a seal between the fixed member (2) and the rotating member (3). And a sealing member (6).
[0024]
A water chamber (10) having an open left end is provided in the housing (1). The fixed-side member (2) is formed integrally by pressing a steel plate such as a cold-rolled steel plate or SPCC, and has a small-diameter cylindrical portion (2a) centered on the horizontal axis in the left-right direction, and a cylindrical portion. An inner flange portion (2b) integrally formed outside the right end portion of (2a) and a large portion integrally formed on the right side of the outer peripheral portion of the flange portion (2b) so as to be concentric with the small-diameter cylindrical portion (2a). It comprises a cylindrical portion (2c) and an outer flange portion (2d) integrally formed outside the right end of the cylindrical portion (2c). The outer flange portion (2d) is fixed to the left end surface of the housing (1) around the opening of the water chamber (10) via a seal (11).
[0025]
The rotating side member (3) is integrally formed by press forming the same steel plate as the fixed side member (2), and the right end is closed and the left end is closed around the horizontal axis in the left-right direction. A relatively long open bottomed cylindrical shaft portion (3a), a flange portion (3b) integrally formed outside the left end of the shaft portion (3a), and a flange concentric with the shaft portion (3a). A cylindrical pulley (cylindrical portion) (3c) integrally formed on the right side of the outer peripheral portion of the portion (3b). The rotation side member (3) is disposed so as to be concentric with the fixed side member (2). The shaft portion (3a) is inserted into the small-diameter cylindrical portion (2a) of the fixed-side member (2) from the left side, and a seal member (6) is interposed between them. The right end of the shaft portion (3a) is located in the water chamber (10) of the housing (1). The flange portion (3b) is close to the left end of the small-diameter cylindrical portion (2a) of the fixed-side member (2). The pulley portion (3c) is located outside the small-diameter cylindrical portion (2a) of the fixed member (2), and a ball bearing (5) is interposed between them. A plurality of openings (12) for allowing water (steam) passing through the seal member (6) to escape are formed in the flange portion (3b) of the rotating member (3). Although not shown, a belt for transmitting a rotational driving force to the rotating member (3) is applied to the pulley portion (3c).
[0026]
The impeller (4) is integrally formed by press-forming a steel plate, and is a relatively short bottomed cylindrical portion (4a) with its right end closed and its left end opened centering on the horizontal axis in the left-right direction. ), A flange (4b) integrally formed outside the left end of the cylindrical portion (4a), and a plurality of blades (4c) integrally formed on the right side of the flange (4b). The cylindrical portion (4a) of the impeller (4) is press-fitted from the right side to the outside of the right end of the shaft portion (3a) of the rotating member (3), and the entire impeller (4) is fixed to the housing (1). It is located in the water chamber (10).
[0027]
The ball bearing (5) is a deep groove ball bearing and includes an inner ring (5a), an outer ring (5b) made of bearing steel such as SUJ2, and a plurality of balls (5c) interposed therebetween. The inner ring (5a) is fixed to the outer periphery of the small-diameter cylindrical portion (2a) of the fixed-side member (2) by press-fitting. The outer ring (5b) is fixed to the inner periphery of the pulley portion (3c) of the rotating member (3) by press fitting.
[0028]
Although the detailed description is omitted, the seal member (6) is a known mechanical seal, and the inner peripheral side portion is fixed to the outer periphery of the shaft portion (3a) of the rotating side member (3) by press fitting, and the outer peripheral side portion is Are fixed to the inner periphery of the small-diameter cylindrical portion (2a) of the fixed-side member (2) by press-fitting.
[0029]
FIG. 2 shows the ball bearing (5) in an enlarged manner.
[0030]
In FIG. 2, R1 represents the radius of curvature of the track (13) of the inner ring (5a), R2 represents the radius of curvature of the track (14) of the outer ring (5b), and D represents the diameter (ball diameter) of the ball (5c). .
[0031]
In the above water pump, the ratio A1 (= R1 / D) of the radius of curvature R1 of the outer raceway (14) to the ball diameter D is 50.5% to 51.5%. The ratio A2 (= R2 / D) of the radius of curvature R2 of the inner raceway (13) to the ball diameter D is 51.5% to 52.5%.
[0032]
In the above-mentioned water pump, the rotating member (3) and the impeller (4) are rotated by the belt applied to the pulley (3c), and the outer ring (5b) of the ball bearing (5) is moved relative to the inner ring (5a). Rotate.
[0033]
Since the ratio A1 in the ball bearing (5) is 51.5% to 52.5%, which is smaller than the conventional one, the axial clearance and the angular clearance can be obtained without reducing the initial radial clearance of the ball bearing (5). The clearance can be reduced, so that abnormal noise, short service life, and falling off of the belt due to excessive clearance can be prevented. Further, since the radius of curvature R1 of the inner raceway (13) and the radius of curvature R2 of the outer raceway (14) are different from each other, there is no risk of seizure.
[0034]
FIGS. 3 and 4 are graphs showing the results of examining the relationship between the initial radial clearance, the axial clearance, and the angular clearance of the ball bearing (5) used in the above-described water pump and the conventional standard designed ball bearing. FIG. 3 shows the relationship with the axial clearance, and FIG. 4 shows the relationship with the angular clearance. The target ball bearing is model number 6004. In FIGS. 3 and 4, a circle indicates the case of the ball bearing (5) used in the above-described water pump, and a cross indicates the case of the conventional ball bearing. In the case of a conventional ball bearing, the ratio A1 is 52.5% to 53.5%, and the ratio A2 is 51.5% to 52.5%. On the other hand, in the case of the ball bearing (5) used in the water pump, the ratio A1 is 50.5% to 51.5% and the ratio A2 is 51.5% to 52.5%, as described above. %.
[0035]
As is clear from FIGS. 3 and 4, in the ball bearing (5) used in the above-described water pump, even if the initial radial clearance is the same as the conventional ball bearing, the axial clearance and the angular clearance are different. Is reduced by 20% or more, and the effect is greater as the initial radial clearance is larger.
[0036]
In the above-described embodiment, the shaft portion and the pulley portion are integrally formed by press forming to form the rotation-side member. However, the rotation-side member may be formed only by the pulley portion. In this case, for example, the rotating member includes a pulley portion that is a large-diameter cylindrical portion, a flange portion integrally formed inside one end portion of the pulley portion, and a small-diameter portion integrally formed on an inner peripheral portion of the flange portion. The small-diameter cylindrical portion is fixed to one end of the shaft by press fitting, and the outer ring of the ball bearing is fixed to the inner periphery of the pulley portion by press fitting. In that case, the shaft portion and the impeller may be formed integrally by press working.
[0037]
Further, in the above-described embodiment, the cylindrical portion to which the outer ring (5b) of the ball bearing (5) is fixed is the pulley portion (3c), but the pulley portion (3c) is provided outside the small-diameter cylindrical portion to which the outer ring of the ball bearing is fixed. A pulley portion for applying a belt may be integrally formed via a flange portion.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part of a water pump showing an embodiment of the present invention.
FIG. 2 is an enlarged vertical sectional view showing a part of the ball bearing of FIG. 1 in an enlarged manner.
FIG. 3 is a graph showing the results of examining the relationship between the initial radial clearance and the axial clearance of a water pump ball bearing according to the present invention and a conventional standard designed ball bearing.
FIG. 4 is a graph showing the results of examining the relationship between initial radial clearance and angular clearance of a water pump ball bearing according to the present invention and a conventional standard designed ball bearing.
[Explanation of symbols]
(2) Fixed side member (2a) Cylindrical part (3) Rotating side member (3a) Shaft part (3b) Flange part (3c) Pulley part (4) Impeller (5) Ball bearing

Claims (3)

ともに金属板のプレス加工により形成された内側の固定側部材の円筒部と外側の回転側部材の円筒部の間に玉軸受が介在させられている水ポンプ用玉軸受装置において、
玉軸受の外輪軌道の曲率半径が玉径の50.5%〜51.5%であることを特徴とする水ポンプ用玉軸受装置。
In a water pump ball bearing device in which a ball bearing is interposed between the cylindrical portion of the inner fixed-side member and the cylindrical portion of the outer rotating-side member both formed by pressing a metal plate,
A ball bearing device for a water pump, wherein the radius of curvature of the outer raceway of the ball bearing is 50.5% to 51.5% of the ball diameter.
回転側部材の円筒部がプーリ部であることを特徴とする請求項1の水ポンプ用玉軸受装置。The ball bearing device for a water pump according to claim 1, wherein the cylindrical portion of the rotation-side member is a pulley portion. 回転側部材が、一端が閉鎖して他端が開口した円筒状のシャフト部と、シャフト部の開口端部の外側に一体に形成されたフランジ部と、フランジ部の外周部のシャフト部閉鎖端側に形成された円筒状のプーリ部とからなり、シャフト部の閉鎖端部に、インペラの円筒部が圧入により固定されていることを特徴とする請求項2の水ポンプ用玉軸受装置。A rotation-side member, a cylindrical shaft portion having one end closed and the other end opened; a flange portion integrally formed outside the open end portion of the shaft portion; and a shaft portion closed end on an outer peripheral portion of the flange portion. The ball bearing device for a water pump according to claim 2, comprising a cylindrical pulley portion formed on the side, and a cylindrical portion of the impeller fixed to the closed end of the shaft portion by press-fitting.
JP2003019833A 2003-01-29 2003-01-29 Ball bearing device for water pump Pending JP2004232683A (en)

Priority Applications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010164068A (en) * 2009-01-13 2010-07-29 Harmonic Drive Syst Ind Co Ltd Wave generator for wave gear device
WO2019049295A1 (en) * 2017-09-07 2019-03-14 株式会社ハーモニック・ドライブ・システムズ Wave generator and wave gear device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010164068A (en) * 2009-01-13 2010-07-29 Harmonic Drive Syst Ind Co Ltd Wave generator for wave gear device
WO2019049295A1 (en) * 2017-09-07 2019-03-14 株式会社ハーモニック・ドライブ・システムズ Wave generator and wave gear device
RU2711155C1 (en) * 2017-09-07 2020-01-15 Хармоник Драйв Системс Инк. Wave generator and wave transmission
CN111033082A (en) * 2017-09-07 2020-04-17 谐波传动系统有限公司 Wave generator and wave gear device
TWI695942B (en) * 2017-09-07 2020-06-11 日商和諧驅動系統股份有限公司 Wave generator and strain wave gearing

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