Bearing with integral shaft

In consideration of the need for improved Audio-Visual (AV) and Office Automation (OA) equipment, bearings used in rotary mechanisms of small precision motors and so forth are increasingly demanded to demonstrate much higher performance. Enhanced quality of Video Cassette Recorders (VCR) and Digital Audio Terminals (DAT), increased density of hard Disk Drives (HDD), and improved printing quality of Laser Beam Printers (LBP) have imposed severe requirements on equipment. These severe design requirements cover improvement of the runout accuracy (rotational repetitive runout, non-repetitive runout), low-noise, and reduction of power consumption as well as being easy-to-assemble. 4BVD is available and meets these exacting demands.

The bearing with integral shaft is a unit. which has no inner ring while having the raceway groove directly on the shaft to incorporate a preload spring between both outer rings.

This type of bearing has the following advantages over normal bearings:

(1) Improved recording/reproduction accuracy 

- Integration of the shaft and inner ring, thereby eliminating movement of the shaft caused by fitting between the shaft and inner ring

- Thick-wall design of the outer ring as required, thereby reducing deformation of the outer ring due to interference

(2) Reduced power consumption of motor 

- Integration of the shaft and inner ring, thereby reducing the ball pitch diameter for the same shaft diameter and resulting in a decrease of torque

(3) High shaft rigidity and compactness 

- Integration of the shaft and inner ring, thereby reducing the bearing's outside diameter for a given size shaft diameter. 

(4) Aiming at "easy-to-assemble" designs 

- No parts are required for preload adjustment and preloading

- No need for selective fitting and adhesion securing of the shaft and inner ring