Autonomous-adjustment electric spindle rotating shaft mechanism and electric spindle

Abstract

The self-adjusting motorized spindle rotating shaft mechanism comprises a rotating shaft penetrating through a motorized spindle shell and a plurality of bearings, the outer rings of the first set of bearings are fixed to the motorized spindle shell, the two ends of the rotating shaft are sleeved with the inner rings of the first set of bearings, the two ends of the rotating shaft are sleeved with the inner rings of the second set of bearings, and the outer rings of the second set of bearings are not in contact with the motorized spindle shell; a set of one-way pushing devices are fixed relative to the electric spindle shell, the pushing devices apply variable pressure to the outer rings of the second set of bearings, the rotating shaft is pushed towards one side in the radial direction, the first set of bearings and the second set of bearings at the same end of the rotating shaft generate two pushing parts of opposite force and positive force, one side clearance of the first set of bearings and one side clearance of the second set of bearings are eliminated, and the rotating shaft is pushed towards one side in the radial direction. Therefore, vibration of the rotating shaft caused by external force is eliminated. The clearance between the roller and the inner and outer rings of the bearings is eliminated through the matching of the two bearings at the same end of the rotating shaft, and as the extrusion of the inner and outer rings of the bearings depends on variable pressure, the matching of the roller and the inner and outer rings of the bearings can be released, the roller cannot be clamped too tightly, and the rotating shaft can rotate smoothly.

Description

technical field [0001] The invention belongs to the field of electric motors, and relates to the stability of a motor rotating shaft, in particular to a self-adjusting electric spindle rotating shaft mechanism and an electric spindle. Background technique [0002] The electric spindle is a kind of motor. The existing problem is that the two ends of the rotating shaft are only provided with two bearings as supports, and the problem of precise bearing coordination is difficult to solve. [0003] The first situation is that there are rollers between the inner and outer rings of the bearing. If the rollers are too well matched, the clearance between the inner and outer rings of the bearing will be small, and there will be no problem with low-speed rotation. If the inner and outer rings of the bearing are overheated and expanded at high speeds, the rollers will be stuck with the inner and outer rings of the bearing. Dead and not smooth. [0004] The second situation is that the ...

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Problems solved by technology

[0005] There is also a patent notification number CN105782252B which discloses a bearing positioning structure. In order to prevent excessive radial shaking and heat generation of the shaft system, a radial clamping structure is set to clamp the outer ring of the bearing. The structure is similar, but it cannot solve the above problems in essence. The shaft vibrates greatly in the clearance range under the condition of external force

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