公开(公告)号：US20030048965A1

公开(公告)日：2003-03-13

申请号：US09955171

申请日：2001-09-19

Applicant: NSK LTD.

Inventor： Seizou Miyazaki ,  Touru Takamizawa

IPC: F16C033/66 ,  F16C043/00

CPC classification number: F16C25/083 ,  F16C19/543 ,  F16C19/548 ,  F16C33/7846 ,  F16C35/061 ,  F16C35/063

Abstract: A bearing unit includes: a housing; a shaft passing through the housing and rotatably supported on the housing; and a pair of rolling bearings disposed between the housing and the shaft and fitted to two positions on the shaft, which are axially spaced apart from each other. At least one rolling bearing has an inner ring press-fitted to the shaft. The inner ring defines an intermediate portion including an inner raceway surface. A reduced diameter part having an outer diameter smaller than the inner diameter of the inner ring and a predetermined width in the axial direction is formed on the shaft at a position corresponding to the intermediate portion so that inner circumferential surfaces located at both ends of the inner ring in the axial direction are interference fitted to the shaft and the inner circumferential surface at the intermediate portion thereof is clearance fitted to the shaft.

Abstract translation: 轴承单元包括：壳体; 穿过所述壳体并可旋转地支撑在所述壳体上的轴; 以及一对滚动轴承，其设置在所述壳体和所述轴之间，并且安装在所述轴上彼此轴向间隔开的两个位置。 至少一个滚动轴承具有压配合到轴的内圈。 内圈限定包括内滚道表面的中间部分。 在所述轴上，在与所述中间部对应的位置处形成具有比所述内圈的内径小的外径和所述内圈的内径的规定宽度的缩径部，使得位于所述内圈的两端的内周面 在轴向上的环是与轴相干配合的，并且其中间部分的内圆周表面间隙配合到轴上。