PROBLEM TO BE SOLVED: To provide a manufacturing method capable of preventing a heat treatment hardened layer formed on an outer ring raceway at an axial outer side of a large diameter, from being excessively deepened, and forming a cylindrical face portion (slide-contact face of shoe in grinding outer ring raceway) superior in circularity, on a part near an axial outer end of an outer peripheral face.SOLUTION: A second intermediate material 24 including a cylindrical portion 25 such that shown in (C) is manufactured, and then an enlarged diameter portion 33 shown in (D) is formed on an axial outer part of the cylindrical portion 25. Then cutting work is performed on an inner peripheral face of the enlarged diameter portion 33 to form an outer ring raceway 4a at an axial outer side as shown in (E). Then a heat treatment hardened layer 11a is formed on the outer ring raceway 4a at the axial outer side by induction hardening as shown in (F), before performing the cut work onto an outer peripheral face of the enlarged diameter portion 33. Then the cutting work is performed on an outer peripheral face of the enlarged diameter portion 33 to form a cylindrical portion 9 for slide-contact of a shoe as shown in (G).SELECTED DRAWING: Figure 3
【課題】直径が大きい軸方向外側の外輪軌道に形成される熱処理硬化層が深くなり過ぎる事を防止できると共に、外周面の軸方向外端寄り部分に、真円度の良好な円筒面部(外輪軌道を研削する際のシューの摺接面)を形成する事ができる製造方法を実現する。【解決手段】(C)に示す様な、筒状部25を備えた第二中間素材24を造った後、筒状部25の軸方向外側部分に、(D)に示す様な拡径部33を形成する。その後、拡径部33の内周面に切削加工を施して、(E)に示す様に、軸方向外側の外輪軌道4aを形成する。その後、拡径部33の外周面に切削加工を施す前に、(F)に示す様に、軸方向外側の外輪軌道4aに高周波焼入れによる熱処理硬化層11aを形成する。その後、拡径部33の外周面に切削加工を施して、(G)に示す様な、シューを摺接させる為の円筒面部9を形成する。【選択図】図3
MANUFACTURING METHOD OF OUTER RING OF ROLLING BEARING UNIT FOR SUPPORTING WHEEL
車輪支持用転がり軸受ユニットの外輪の製造方法
2017-05-18
Patent
Electronic Resource
Japanese
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