JP4609417B2 - Manufacturing method of rotary shaft for water pump - Google Patents

Manufacturing method of rotary shaft for water pump Download PDF

Info

Publication number
JP4609417B2
JP4609417B2 JP2006305798A JP2006305798A JP4609417B2 JP 4609417 B2 JP4609417 B2 JP 4609417B2 JP 2006305798 A JP2006305798 A JP 2006305798A JP 2006305798 A JP2006305798 A JP 2006305798A JP 4609417 B2 JP4609417 B2 JP 4609417B2
Authority
JP
Japan
Prior art keywords
diameter shaft
shaft portion
outer peripheral
peripheral surface
intermediate material
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
Application number
JP2006305798A
Other languages
Japanese (ja)
Other versions
JP2008121775A (en
JP2008121775A5 (en
Inventor
一登 小林
功 新藤
清司 大塚
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.)
NSK Ltd
Original Assignee
NSK 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 NSK Ltd filed Critical NSK Ltd
Priority to JP2006305798A priority Critical patent/JP4609417B2/en
Publication of JP2008121775A publication Critical patent/JP2008121775A/en
Publication of JP2008121775A5 publication Critical patent/JP2008121775A5/ja
Application granted granted Critical
Publication of JP4609417B2 publication Critical patent/JP4609417B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rolling Contact Bearings (AREA)

Description

この発明は、エンジンの冷却水を循環させる為のウォータポンプに組み込み、エンジンにより回転駆動される従動プーリの回転を、冷却水を循環させる為のインペラに伝達する為の、ウォータポンプ用回転軸の製造方法の改良に関する。   This invention is incorporated in a water pump for circulating engine cooling water, and a rotation axis of a water pump for transmitting rotation of a driven pulley driven by the engine to an impeller for circulating cooling water. The present invention relates to an improvement of a manufacturing method.

自動車用エンジンの冷却水を循環させる為のウォータポンプとして、図5〜6に示す様な構造のものが、特許文献1、2に記載される等により、従来から広く知られている。円筒形のハウジング1は、内端部(軸方向に関して内とは、エンジン寄りの側を言い、図1〜3の下側。図4〜6の右側。)外周面に形成した取付フランジ2を利用して、エンジンのシリンダブロックに固定される。このハウジング1の内径側には回転軸3を、内側の玉軸受4と外側(軸方向に関して外とは、エンジンから遠い側を言い、図1〜3の上側。図4〜6の左側。)のころ軸受5とを組み合わせて成る転がり軸受ユニット6により、回転自在に支持している。尚、この転がり軸受ユニットは、例えば特許文献1に記載されている様に、複列の玉列により構成する場合もある。   As a water pump for circulating the cooling water of an automobile engine, a water pump having a structure as shown in FIGS. The cylindrical housing 1 has a mounting flange 2 formed on the outer peripheral surface thereof (the inner side in the axial direction means the side closer to the engine, the lower side in FIGS. 1 to 3, the right side in FIGS. 4 to 6). Utilized, it is fixed to the cylinder block of the engine. On the inner diameter side of the housing 1, the rotating shaft 3 is arranged on the inner side with the ball bearing 4 on the inner side (the outer side in the axial direction is the side far from the engine, and is the upper side in FIGS. 1 to 3 and the left side in FIGS. 4 to 6). The roller bearing 5 is combined with a roller bearing 5 and is rotatably supported. In addition, this rolling bearing unit may be comprised by the double row ball array as described in patent document 1, for example.

又、上記転がり軸受ユニット6の軸方向(図5〜6の左右方向)両端部にはシールリング7、7を設けて、内部に封入したグリースの漏出防止と、外部に存在する塵芥や水蒸気等の異物の侵入防止とを図っている。又、上記回転軸3の外端寄り部分で上記ハウジング1の外端開口から突出した部分に、プーリ8を固定している。エンジンへの組み付け状態では、このプーリ8に図示しないベルトを掛け渡し、上記回転軸3をエンジンのクランクシャフトにより回転駆動する。   Further, seal rings 7 and 7 are provided at both ends of the rolling bearing unit 6 in the axial direction (left and right direction in FIGS. 5 to 6) to prevent leakage of grease sealed inside, dust, water vapor, etc. existing outside. To prevent intrusion of foreign matter. A pulley 8 is fixed to a portion protruding from the outer end opening of the housing 1 near the outer end of the rotating shaft 3. In the assembled state to the engine, a belt (not shown) is stretched around the pulley 8 and the rotary shaft 3 is driven to rotate by the crankshaft of the engine.

一方、上記回転軸3の内端部で上記取付フランジ2の内側面から突出した部分に、インペラ9を固定している。この取付フランジ2をエンジンのシリンダブロックに固定した状態でこのインペラ9は、このシリンダブロック内に設けたウォータジャケットの内側に入り込む。そして、上記回転軸3の回転に伴って、上記ウォータジャケット内の冷却水を、図示しないラジエータ等との間で循環させる。   On the other hand, an impeller 9 is fixed to a portion protruding from the inner surface of the mounting flange 2 at the inner end of the rotating shaft 3. The impeller 9 enters the inside of a water jacket provided in the cylinder block in a state where the mounting flange 2 is fixed to the cylinder block of the engine. Then, as the rotary shaft 3 rotates, the cooling water in the water jacket is circulated with a radiator or the like (not shown).

更に、回転軸3の外周面とハウジング1の内周面との間にはメカニカルシール10を設けている。このメカニカルシール10は、エンジンの運転時、この回転軸3の回転を許容しつつ、ウォータジャケット内を流れる水蒸気を含んだ熱水が外部に漏出するのを防止する。尚、上述したウォータポンプは、例えば特許文献2に記載されている様に、上記回転軸3の上記プーリ8よりも外方に冷却ファンを固定して、このプーリ8により、冷却ファンと共に駆動される場合もある。   Further, a mechanical seal 10 is provided between the outer peripheral surface of the rotating shaft 3 and the inner peripheral surface of the housing 1. The mechanical seal 10 prevents the hot water containing water vapor flowing in the water jacket from leaking outside while allowing the rotation of the rotating shaft 3 during operation of the engine. The water pump described above is driven together with the cooling fan by fixing the cooling fan outside the pulley 8 of the rotating shaft 3 as described in Patent Document 2, for example. There is also a case.

又、上述の図5〜6に示した構造の場合、回転軸3は、軸受鋼等の金属製で、それぞれが中実の小径軸部11と大径軸部12とを一体に形成したものである。このうちの大径軸部12は、外周面に前記転がり軸受ユニット6を構成する、玉軸受4ところ軸受5とのそれぞれの内輪軌道36、36aを形成すると共に、外周面の一部に上記プーリ8を固定する。又、上記大径軸部12には、冷却ファンを固定する場合もある。従って、この大径軸部12は、このプーリ8に作用するベルトの張力や、この冷却ファンの自重等、負荷される荷重が大きい。この為、この大径軸部12は、中実とすると共に直径を大きくして十分な剛性を確保する必要がある。   In the case of the structure shown in FIGS. 5 to 6 described above, the rotary shaft 3 is made of metal such as bearing steel, and each is formed by integrally forming a solid small-diameter shaft portion 11 and a large-diameter shaft portion 12. It is. Among these, the large-diameter shaft portion 12 forms the inner ring raceways 36 and 36a constituting the rolling bearing unit 6 on the outer peripheral surface, and each of the ball bearing 4 and the bearing 5, and the pulley on a part of the outer peripheral surface. 8 is fixed. In some cases, a cooling fan is fixed to the large-diameter shaft portion 12. Therefore, the large-diameter shaft portion 12 is subjected to a large load such as the tension of the belt acting on the pulley 8 and the weight of the cooling fan. For this reason, the large-diameter shaft portion 12 must be solid and have a large diameter to ensure sufficient rigidity.

これに対して、上記小径軸部11は、外周面と前記ハウジング1の内周面との間に上記メカニカルシール10を設けると共に、内端部に上記インペラ9を固定する。従って、上記小径軸部11に負荷される荷重は、冷却水を循環させる際にこのインペラ9が受ける抵抗力や、上記メカニカルシール10の摺動抵抗等に止まり、上記大径軸部12に負荷される荷重と比べて小さい。この為、上記小径軸部11には、それ程大きい剛性は必要ない。この為、この小径軸部11の外径は、必要とする強度及び剛性を確保しつつ軽量化を図る為、上記大径軸部12の外径よりも十分に小さくし、これら両軸部11、12同士の間に段部13を設けている。   On the other hand, the small diameter shaft portion 11 provides the mechanical seal 10 between the outer peripheral surface and the inner peripheral surface of the housing 1 and fixes the impeller 9 to the inner end portion. Accordingly, the load applied to the small-diameter shaft portion 11 is limited to the resistance force that the impeller 9 receives when circulating the cooling water, the sliding resistance of the mechanical seal 10, and the like. Small compared to the load applied. For this reason, the small-diameter shaft portion 11 does not need to be so rigid. Therefore, the outer diameter of the small-diameter shaft portion 11 is made sufficiently smaller than the outer diameter of the large-diameter shaft portion 12 in order to reduce the weight while ensuring the required strength and rigidity. , 12 is provided with a stepped portion 13.

上述の様なウォータポンプを構成する回転軸3を従来一般的には、上記大径軸部12の外径以上の外径を有する円柱状の素材に、旋削等の削り加工を施す事により造っていた。この為、上記回転軸3を加工する為に要する時間が長くなるだけでなく、材料の歩留りも悪く、この回転軸3の製造コストが嵩む事が避けられなかった。一部の加工を鍛造加工等の塑性加工により行なう事で材料の歩留り向上と加工時間の短縮とを図る事も考えられるが、塑性加工に伴って生じる余肉の始末に就いて十分に考慮しない限り、かなりの部分を切削加工により行なわざるを得ず、製造コストを十分に低く抑える事はできない。   Conventionally, the rotary shaft 3 constituting the water pump as described above is generally formed by subjecting a cylindrical material having an outer diameter equal to or larger than the outer diameter of the large-diameter shaft portion 12 to a turning process. It was. For this reason, not only the time required for processing the rotating shaft 3 is lengthened, but also the yield of the material is poor, and it is inevitable that the manufacturing cost of the rotating shaft 3 is increased. It may be possible to improve the material yield and shorten the processing time by performing some processing by plastic processing such as forging, but do not fully consider the surplus of waste caused by plastic processing. As long as a significant portion is cut by cutting, the manufacturing cost cannot be kept low enough.

特開平9−222122号公報JP-A-9-222122 特開2002−115548号公報JP 2002-115548 A

本発明は、上述の様な事情に鑑みて、材料の歩留り向上と加工時間の短縮とを図る事で、製造コストを十分に低減できる、ウォータポンプ用回転軸の製造方法を実現すべく発明したものである。   In view of the circumstances as described above, the present invention has been invented to realize a method for manufacturing a rotary shaft for a water pump that can sufficiently reduce manufacturing costs by improving material yield and shortening processing time. Is.

本発明のウォータポンプ用回転軸の製造方法は、先ず、金属材製で円柱状の素材を冷間で塑性変形させる。
そして、小径軸部の軸方向端部と大径軸部の軸方向端部との間に段部を設けた段付円筒状とすると共に、このうちの大径軸部側の端面外周縁部に面取り部を、この大径軸部の外周面の一部に金属材料の余肉分を集めて径方向外方に突出した突条部を、それぞれ形成して中間素材とする。
その後、上記中間素材に、冷間でこの突条部を押し潰す扱き加工を施す事により、上記大径軸部の外径を均一にする。
In the method for manufacturing a rotary shaft for a water pump according to the present invention, first, a cylindrical material made of a metal material is plastically deformed cold.
And it is set as the stepped cylindrical shape which provided the step part between the axial direction edge part of the small diameter shaft part, and the axial direction edge part of the large diameter shaft part, and the end surface outer periphery part by the side of the large diameter shaft part of these A chamfered portion is formed on each of the outer peripheral surfaces of the large-diameter shaft portion, and protruding portions protruding outward in the radial direction by collecting surplus metal material are formed as intermediate materials.
After that, the outer diameter of the large-diameter shaft portion is made uniform by subjecting the intermediate material to a cold working process that crushes the protruding portion.

この為に本発明の場合、具体的には、先ず、上記素材を冷間で塑性変形させる前方押し出し加工により、小径軸部と大径軸部とを傾斜段部により連続させた、段付円筒状の予備中間素材とする。
その後、この予備中間素材に、上記大径軸部の外周面のうちの軸方向一部のみを拘束しない状態のまま、冷間でこの大径軸部を軸方向に押圧する据え込み加工を施す事により、上記傾斜段部の傾斜角度を整えて上記段部とし、余肉を上記大径軸部の外周面の一部に集めてこの部分に上記突条部を形成し、上記中間素材とする。
又、上記扱き加工の後、上記大径軸部の外周面の一部に、ウォータポンプ用回転軸を支持する為の転がり軸受用の内輪軌道を切削加工により形成する。そして、この外周面のうちでこの内輪軌道から外れた部分には、切削加工を施さない。
Therefore, in the case of the present invention, specifically, first, a stepped cylinder in which a small diameter shaft portion and a large diameter shaft portion are made continuous by an inclined step portion by a forward extrusion process in which the material is plastically deformed cold. Preliminary intermediate material.
Thereafter, the preliminary intermediate material is subjected to an upsetting process in which the large-diameter shaft portion is pressed in the cold direction while only a part of the outer peripheral surface of the large-diameter shaft portion is not restrained in the axial direction. the thing, established a tilt angle of the inclined step portion and the stepped portion to form the ridges on the part attracting excess thickness to a portion of the outer peripheral surface of the large diameter shaft portion, and the intermediate material To do.
Further, after the handling process, an inner ring raceway for a rolling bearing for supporting the rotary shaft for the water pump is formed by cutting on a part of the outer peripheral surface of the large-diameter shaft portion. And the part which remove | deviated from this inner ring | wheel track | truck among this outer peripheral surface is not cut.

上述の様な本発明を実施する場合に、例えば請求項2に記載した様に、上記素材に前方押し出し加工を施す以前に、大径軸部側の端面外周縁部に面取り部を形成する。
或いは、請求項3に記載した様に、予備中間素材に据え込み加工を施して中間素材とする際に、大径軸部側の端面外周縁部に面取り部を形成する。
When carrying out the present invention as described above, for example, as described in claim 2 , a chamfered portion is formed at the outer peripheral edge of the end surface on the large-diameter shaft portion side before the material is subjected to forward extrusion.
Alternatively, as described in claim 3 , when the preliminary intermediate material is subjected to upsetting to form an intermediate material, a chamfered portion is formed on the outer peripheral edge of the end surface on the large diameter shaft portion side.

又、上述の様な本発明を実施する場合に、好ましくは、請求項4に記載した様に、上記扱き加工の後、小径軸部の外周面及び先端面と段部の表面とに、これら各面の精度を向上させる為の切削加工を施す。 In carrying out the present invention as described above, preferably , as described in claim 4, after the handling, the outer peripheral surface of the small-diameter shaft portion, the tip surface, and the surface of the step portion are A cutting process is performed to improve the accuracy of each surface.

上述の様に構成するウォータポンプ用回転軸の製造方法によれば、材料の歩留り向上と加工時間の短縮とを図る事で、製造コストを十分に低減できる。   According to the method for manufacturing a rotary shaft for a water pump configured as described above, the manufacturing cost can be sufficiently reduced by improving the material yield and shortening the processing time.

図1〜4は、本発明の実施の形態の第1例を示している。本例の場合、図1に示す様に、冷間鍛造装置の一種である、多段フォーマーにより、図1の(A)に示した第二素材14を、(B)に示した予備中間素材15、(C)に示した中間素材16を経て、(D)に示す第二中間素材17に加工する。尚、これら一連の加工は、総て冷間で行なう。   1 to 4 show a first example of an embodiment of the present invention. In the case of this example, as shown in FIG. 1, the second material 14 shown in FIG. 1A is replaced with the preliminary intermediate material 15 shown in FIG. 1B by a multi-stage former, which is a kind of cold forging device. Then, the intermediate material 16 shown in (C) is processed into a second intermediate material 17 shown in (D). In addition, these series of processes are all performed cold.

先ず、長尺材を所定長さに切断する事により得られる円柱状の素材に、図1の(A)に示す矯正工程を施す。この矯正工程では、この素材を、上下1対の矯正ダイス18a、18b同士の間で挟持して軸方向に押圧し、この素材の端面及び外周面の歪みを除去して、上記第二素材14とする。図示の例では、この第二素材14の軸方向両端部のうち、小径軸部11{図1の(B)〜(D)及び図4参照}とすべき側の端面外径寄り部分に、比較的曲率半径の大きな凸曲面部19を形成する。同時に、大径軸部12{図1の(B)〜(D)及び図4参照}とすべき側の端面外周縁部に、断面形状が四分の一円弧状の面取り部20を形成する。この様な矯正工程で上記第二素材14を形成したならば、上記両矯正ダイス18a、18bを離すと共に、ノックアウトピン21a、21bにより上記第二素材14をこれら両矯正ダイス18a、18bから押し出して、図1の(B)に示した、前方押し出し加工工程に送る。   First, a correction process shown in FIG. 1A is performed on a columnar material obtained by cutting a long material into a predetermined length. In this straightening process, this material is sandwiched between a pair of upper and lower straightening dies 18a, 18b and pressed in the axial direction to remove the distortion of the end face and outer peripheral surface of this material, and the second material 14 And In the example shown in the drawing, in the axial direction both ends of the second material 14, the small diameter shaft portion 11 {refer to (B) to (D) in FIG. 1 and FIG. 4) on the end surface outer diameter portion on the side to be the side, A convex curved surface portion 19 having a relatively large curvature radius is formed. At the same time, a chamfered portion 20 having a quarter-arc-shaped cross section is formed on the outer peripheral edge portion of the end surface on the side that should be the large-diameter shaft portion 12 {see FIGS. 1 (B) to (D) and FIG. 4}. . When the second material 14 is formed in such a correction process, both the correction dies 18a and 18b are released, and the second material 14 is pushed out of the both correction dies 18a and 18b by the knockout pins 21a and 21b. , And sent to the forward extrusion process shown in FIG.

この前方押し出し加工工程では、上記第二素材14を、押し出し加工ダイス22の成形孔23内にパンチ24により押し込み、この第二素材14をこの成形孔23の内周面形状に合わせて塑性変形させ、上記予備中間素材15とする。この予備中間素材15は、小径軸部11と大径軸部12とを傾斜段部25により連続させた段付円筒状である。この様な予備中間素材15は、上記パンチ24を上昇させた後、上記押し出し加工ダイス22に設けたノックアウトピン26により上記成形孔23から取り出して、図1の(C)に示した据え込み加工工程に送る。   In the forward extrusion process, the second material 14 is pushed into the forming hole 23 of the extrusion die 22 by the punch 24, and the second material 14 is plastically deformed according to the shape of the inner peripheral surface of the forming hole 23. The preliminary intermediate material 15 is used. The preliminary intermediate material 15 has a stepped cylindrical shape in which the small-diameter shaft portion 11 and the large-diameter shaft portion 12 are made continuous by the inclined step portion 25. Such a preliminary intermediate material 15 is lifted from the punch 24 and then taken out from the forming hole 23 by a knockout pin 26 provided on the extrusion die 22, and the upsetting process shown in FIG. Send to process.

この据え込み加工工程では、上記予備中間素材15を、上下1対の据え込みダイス27a、27b同士の間で挟持して軸方向に強く押圧し、これら両据え込みダイス27a、27bの内面形状を上記予備中間素材15に転写して、前記中間素材16とする。この様な据え込み加工工程では、上記予備中間素材15の傾斜段部25を軸方向に押し潰して、中心軸に対し直角方向に存在する段部13とする。又、大径軸部12の端面外周縁部の面取り部20に関しても、再度押圧して、形状を整える。この様な加工を行なう、上記据え込み加工工程で、上記両据え込みダイス27a、27bの先端面同士は最後まで当接せず、この据え込み加工工程が完了する状態でも、これら両先端面同士の間に隙間28が存在する。即ち、この据え込み加工工程は、上記大径軸部12の外周面のうちの軸方向一部のみを拘束しない状態のまま行なう。この為、上記傾斜段部25を上記段部13に加工する等により生じた余肉は、図2に詳示する様に、上記隙間28部分で径方向に膨らみ、環状の突条部29を形成する。この様な据え込み加工工程で上記中間素材16を形成したならば、上記両据え込みダイス27a、27bを離すと共に、ノックアウトピン30a、30bにより上記中間素材16をこれら両据え込みダイス27a、27bから押し出して、図1の(D)に示した、扱き加工工程に送る。   In this upsetting process, the preliminary intermediate material 15 is sandwiched between a pair of upper and lower upset dies 27a, 27b and pressed strongly in the axial direction, and the inner shape of both upset dies 27a, 27b is changed. The intermediate material 16 is transferred to the preliminary intermediate material 15. In such an upsetting process, the inclined step portion 25 of the preliminary intermediate material 15 is crushed in the axial direction to form a step portion 13 that exists in a direction perpendicular to the central axis. Further, the chamfered portion 20 at the outer peripheral edge portion of the end surface of the large-diameter shaft portion 12 is also pressed again to adjust the shape. In the upsetting process in which such processing is performed, the tip surfaces of the upsetting dies 27a and 27b do not come into contact with each other. There is a gap 28 between them. That is, this upsetting process is performed in a state where only a part of the outer peripheral surface of the large-diameter shaft portion 12 in the axial direction is not restrained. For this reason, as shown in detail in FIG. 2, the surplus generated by processing the inclined step portion 25 into the step portion 13 swells in the radial direction at the gap 28 portion, and the annular protrusion 29 is formed. Form. If the intermediate material 16 is formed in such upsetting process, the both upsetting dies 27a and 27b are released, and the intermediate material 16 is removed from the upsetting dies 27a and 27b by the knockout pins 30a and 30b. Extruded and sent to the handling process shown in FIG.

この扱き加工工程では、上記中間素材16を、扱きダイス31の扱き孔32内に、パンチ33により押し込む。この扱き孔32の内周面中間部には、図3に詳示する様に、この扱き孔32の内周面本体部分と傾斜面により連続した、環状凸部34が形成されている。上記中間素材16の大径軸部12の外周面に存在する、上記突条部29は、上記環状凸部34の内側を通過する事で押し潰され(扱かれ)、上記大径軸部12の外径が均一になり、前記第二中間素材17となる。この様な第二中間素材17は、上記パンチ33を上昇させた後、上記扱きダイス31に設けたノックアウトピン35により上記扱き孔32から取り出して、仕上加工工程に送る。   In this handling process, the intermediate material 16 is pushed into the handling hole 32 of the handling die 31 by the punch 33. As shown in detail in FIG. 3, an annular convex portion 34 that is continuous with the inner peripheral surface main body portion of the handling hole 32 and the inclined surface is formed in the middle portion of the handling hole 32. The protruding portion 29 existing on the outer peripheral surface of the large-diameter shaft portion 12 of the intermediate material 16 is crushed (handled) by passing through the inside of the annular convex portion 34, and the large-diameter shaft portion 12. The outer diameter of the second intermediate material 17 becomes uniform. The second intermediate material 17 is raised from the handling hole 32 by the knockout pin 35 provided on the handling die 31 after the punch 33 is lifted, and sent to the finishing process.

この仕上加工工程では、図4に破線を付した部分に切削加工を施す。更に、必要とする熱処理後、この部分及び上記大径軸部12の外周面に研削加工を施して、ウォータポンプ用の回転軸3として完成する。即ち、上記仕上加工工程では、大径軸部12の外周面の一部に、回転軸を支持する為の玉軸受4(図6参照)用の内輪軌道36を切削加工により形成する。上記大径軸部12の外周面でこの内輪軌道36から外れた部分には切削加工は施さない。又、小径軸部11の外周面及び先端面と段部の表面とに、これら各面の精度を向上させる為の切削加工を施す。但し、この切削加工を省略して、上記小径軸部11の外周面及び先端面と段部の表面とに、上記扱き加工工程後、直ちに熱処理及び研削加工を施す事もできる。 In this finishing process, cutting is performed on the part indicated by the broken line in FIG. Further, after the necessary heat treatment, this portion and the outer peripheral surface of the large-diameter shaft portion 12 are ground to complete the rotary shaft 3 for the water pump. That is, in the finishing process, an inner ring raceway 36 for the ball bearing 4 (see FIG. 6) for supporting the rotating shaft is formed on a part of the outer peripheral surface of the large-diameter shaft portion 12 by cutting. A portion of the outer peripheral surface of the large-diameter shaft portion 12 that is off the inner ring raceway 36 is not cut. Further, the outer peripheral surface and the front end surface of the small-diameter shaft portion 11 and the surface of the step portion are subjected to cutting for improving the accuracy of these surfaces. However, this cutting process may be omitted, and the outer peripheral surface, the tip surface, and the stepped surface of the small-diameter shaft portion 11 may be subjected to heat treatment and grinding immediately after the handling process.

本発明の実施の形態の1例を工程順に示す断面図。Sectional drawing which shows one example of embodiment of this invention in order of a process. 図1の(C)のX部拡大図。The X section enlarged view of (C) of FIG. 図1の(D)のY部拡大図。The Y section enlarged view of (D) of FIG. 完成後のウォータポンプ用回転軸の側面図。The side view of the rotating shaft for water pumps after completion. ウォータポンプの構造の1例を示す断面図。Sectional drawing which shows one example of the structure of a water pump. ウォータポンプの回転支持装置部分のみを取り出して示す断面図。Sectional drawing which takes out and shows only the rotation support apparatus part of a water pump.

符号の説明Explanation of symbols

1 ハウジング
2 取付フランジ
3 回転軸
4 玉軸受
5 ころ軸受
6 転がり軸受ユニット
7 シールリング
8 プーリ
9 インペラ
10 メカニカルシール
11 小径軸部
12 大径軸部
13 段部
14 第二素材
15 予備中間素材
16 中間素材
17 第二中間素材
18a、18b 矯正ダイス
19 凸曲面部
20 面取り部
21a、21b ノックアウトピン
22 押し出し加工ダイス
23 成形孔
24 パンチ
25 傾斜段部
26 ノックアウトピン
27a、27b 据え込みダイス
28 隙間
29 突条部
30a、30b ノックアウトピン
31 扱きダイス
32 扱き孔
33 パンチ
34 環状凸部
35 ノックアウトピン
36 内輪軌道
DESCRIPTION OF SYMBOLS 1 Housing 2 Mounting flange 3 Rotating shaft 4 Ball bearing 5 Roller bearing 6 Rolling bearing unit 7 Seal ring 8 Pulley 9 Impeller 10 Mechanical seal 11 Small diameter shaft part 12 Large diameter shaft part 13 Step part 14 Second material 15 Preliminary intermediate material 16 Intermediate Material 17 Second intermediate material 18a, 18b Straightening die 19 Convex curved surface portion 20 Chamfered portion 21a, 21b Knockout pin 22 Extrusion die 23 Molding hole 24 Punch 25 Inclined step portion 26 Knockout pin 27a, 27b Upset die 28 Clearance 29 Projection Part 30a, 30b Knockout pin 31 Handling die 32 Handling hole 33 Punch 34 Annular convex part 35 Knockout pin 36 Inner ring track

Claims (4)

金属材製で円柱状の素材を冷間で塑性変形させる事により、小径軸部の軸方向端部と大径軸部の軸方向端部との間に段部を設けた段付円筒状とすると共に、このうちの大径軸部側の端面外周縁部に面取り部を、この大径軸部の外周面の一部に金属材料の余肉分を集めて径方向外方に突出した突条部を、それぞれ形成して中間素材とした後、この中間素材に、冷間でこの突条部を押し潰す扱き加工を施す事により、上記大径軸部の外径を均一にするウォータポンプ用回転軸の製造方法であって、上記素材を前方押し出し加工により冷間で塑性変形させる事で、上記小径軸部と上記大径軸部とを傾斜段部により連続させた段付円筒状の予備中間素材とした後、この予備中間素材に、上記大径軸部の外周面のうちの軸方向一部のみを拘束しない状態のまま、冷間でこの大径軸部を軸方向に押圧する据え込み加工を施す事により、上記傾斜段部の傾斜角度を整えて上記段部とし、余肉を上記大径軸部の外周面の一部に集めて上記突条部を有する上記中間素材とすると共に、上記扱き加工の後、上記大径軸部の外周面の一部に、ウォータポンプ用回転軸を支持する為の転がり軸受用の内輪軌道を切削加工により形成し、この外周面のうちでこの内輪軌道から外れた部分には切削加工を施さない、ウォータポンプ用回転軸の製造方法。 A cylindrical material made of a metal material is plastically deformed in the cold, thereby providing a stepped cylindrical shape having a step portion between the axial end portion of the small diameter shaft portion and the axial end portion of the large diameter shaft portion. In addition, a chamfered portion is formed on the outer peripheral edge of the end surface on the large-diameter shaft portion, and a surplus portion of the metal material is collected on a part of the outer peripheral surface of the large-diameter shaft portion to protrude radially outward. A water pump that equalizes the outer diameter of the large-diameter shaft portion by forming a strip portion as an intermediate material, and then subjecting the intermediate material to a cold processing to crush the projection portion in the cold. A method of manufacturing a rotary shaft for a step, wherein the raw material is plastically deformed by cold by a forward extrusion process, whereby the small diameter shaft portion and the large diameter shaft portion are made continuous by an inclined step portion. After making the preliminary intermediate material, only a part of the outer peripheral surface of the large-diameter shaft portion in the axial direction is not restricted to the preliminary intermediate material. As it is, by performing upsetting to coldly press the large-diameter shaft portion in the axial direction, the inclination angle of the inclined step portion is adjusted to form the step portion, and the surplus wall is the outer peripheral surface of the large-diameter shaft portion. Rolling bearings for supporting the rotary shaft for the water pump on a part of the outer peripheral surface of the large-diameter shaft portion after the handling process. A method for manufacturing a rotary shaft for a water pump , wherein an inner ring raceway is formed by cutting, and a portion of the outer peripheral surface that is off the inner ring raceway is not cut . 素材に前方押し出し加工を施す以前に、大径軸部側の端面外周縁部に面取り部を形成する、請求項1に記載したウォータポンプ用回転軸の製造方法。 The manufacturing method of the rotating shaft for water pumps of Claim 1 which forms a chamfering part in the outer peripheral edge part of the end surface by the side of a large diameter shaft part before performing a front extrusion process to a raw material. 予備中間素材に据え込み加工を施して中間素材とする際に、大径軸部側の端面外周縁部に面取り部を形成する、請求項1に記載したウォータポンプ用回転軸の製造方法。 The manufacturing method of the rotating shaft for water pumps of Claim 1 which forms a chamfering part in the outer-periphery edge part of the end surface by the side of a large diameter shaft part, when setting up an intermediate material by carrying out an upsetting process to a preliminary | backup intermediate material. 扱き加工の後、小径軸部の外周面及び先端面と段部の表面とに、これら各面の精度を向上させる為の切削加工を施す、請求項1〜3のうちの何れか1項に記載したウォータポンプ用回転軸の製造方法。 The processing according to any one of claims 1 to 3 , wherein after the handling process, the outer peripheral surface and the front end surface of the small-diameter shaft portion and the surface of the step portion are subjected to cutting for improving the accuracy of each surface. The manufacturing method of the rotating shaft for water pumps described.
JP2006305798A 2006-11-10 2006-11-10 Manufacturing method of rotary shaft for water pump Expired - Fee Related JP4609417B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006305798A JP4609417B2 (en) 2006-11-10 2006-11-10 Manufacturing method of rotary shaft for water pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006305798A JP4609417B2 (en) 2006-11-10 2006-11-10 Manufacturing method of rotary shaft for water pump

Publications (3)

Publication Number Publication Date
JP2008121775A JP2008121775A (en) 2008-05-29
JP2008121775A5 JP2008121775A5 (en) 2009-07-09
JP4609417B2 true JP4609417B2 (en) 2011-01-12

Family

ID=39506743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006305798A Expired - Fee Related JP4609417B2 (en) 2006-11-10 2006-11-10 Manufacturing method of rotary shaft for water pump

Country Status (1)

Country Link
JP (1) JP4609417B2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5890435A (en) * 1981-11-13 1983-05-30 Tsukiboshi Seisakusho:Kk Manufacture of operating rod for brake booster and device for it
JP2000140979A (en) * 1998-11-11 2000-05-23 Nippon Koshuha Steel Co Ltd Stepped shaft part and its production method
JP2004162629A (en) * 2002-11-14 2004-06-10 Koyo Seiko Co Ltd Rolling bearing unit for water pump and its manufacturing method
JP2006111070A (en) * 2004-10-13 2006-04-27 Nsk Ltd Hub unit for supporting wheel, bearing ring member of hub unit for supporting wheel, and its manufacturing method
JP2006289374A (en) * 2005-04-05 2006-10-26 Toyota Motor Corp Cold-forging method and raw material therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5890435A (en) * 1981-11-13 1983-05-30 Tsukiboshi Seisakusho:Kk Manufacture of operating rod for brake booster and device for it
JP2000140979A (en) * 1998-11-11 2000-05-23 Nippon Koshuha Steel Co Ltd Stepped shaft part and its production method
JP2004162629A (en) * 2002-11-14 2004-06-10 Koyo Seiko Co Ltd Rolling bearing unit for water pump and its manufacturing method
JP2006111070A (en) * 2004-10-13 2006-04-27 Nsk Ltd Hub unit for supporting wheel, bearing ring member of hub unit for supporting wheel, and its manufacturing method
JP2006289374A (en) * 2005-04-05 2006-10-26 Toyota Motor Corp Cold-forging method and raw material therefor

Also Published As

Publication number Publication date
JP2008121775A (en) 2008-05-29

Similar Documents

Publication Publication Date Title
JP5151489B2 (en) Manufacturing method of bearing outer ring
JP6523677B2 (en) Method of manufacturing hub wheel and inner member of wheel bearing device
JP2008173677A (en) Manufacturing method of raceway ring member
JP2008037272A (en) Race member for rolling bearing unit, rolling bearing unit, and method and device for manufacturing race member for rolling bearing unit
JP4840102B2 (en) Method for manufacturing bearing ring member
JP2017013079A (en) Processing method of bearing device for wheel
JP4674580B2 (en) Method for manufacturing bearing ring member
JP4609417B2 (en) Manufacturing method of rotary shaft for water pump
JP5034684B2 (en) Method for manufacturing rolling ring bearing ring
JP2006123003A (en) Method and apparatus for producing high precision ring
JP4961778B2 (en) Manufacturing method of bearing ring member for rolling bearing unit
JP5168852B2 (en) Bearing unit
JP2007100715A (en) Bearing device for vehicle
US20130205593A1 (en) Manufacturing method for bearing outer ring
JP2005088668A (en) Rolling bearing unit for supporting wheel, and method for manufacturing the same
JP4826491B2 (en) Method for manufacturing bearing ring member
JP5099875B2 (en) Wheel bearing device
JP2015028372A (en) Rolling bearing unit for supporting wheel
JP2017223253A (en) Manufacturing method of bearing device for wheel
JP2017082824A (en) Manufacturing method of outer ring of rolling bearing unit for supporting wheel
JP2006341255A (en) High-precision ring manufacturing method
JP7031802B1 (en) Caulking device and caulking method for bearing unit, hub unit bearing manufacturing method and manufacturing device, vehicle manufacturing method
JP6252179B2 (en) Manufacturing method of bearing outer ring
JP7004092B2 (en) Caulking assembly and its manufacturing method, hub unit bearing and its manufacturing method, and automobile and its manufacturing method.
WO2015045798A1 (en) Tapered roller bearing

Legal Events

Date Code Title Description
A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090522

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20090522

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20090827

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100415

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100420

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100621

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20100914

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100927

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131022

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4609417

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees