an electric spindle

Abstract

The invention discloses a motorized spindle. A core shaft, a rotor fixed to the core shaft, a stator, two rear end bearings arranged at the rear portion of the core shaft, rear end bearing blocks sleeving the rear end bearings, a front end bearing arranged at the front portion of the core shaft and a front end bearing block sleeving the front end bearing are included. The part, between the two rear end bearings, of the core shaft is sleeved with a cooling cavity. The two opposite side walls of the cooling cavity are provided with a first liquid inlet channel and a first liquid discharging channel correspondingly. The parts, between the motorized spindle stator and the rear end bearings, of the core shaft are each sleeved with a heat isolation cavity, and the two opposite side walls of theheat isolation cavity are provided with a second liquid inlet channel and a second liquid discharging channel correspondingly. The front end bearing blocks are sleeved with copper insert bearings, thecopper insert bearings are each sleeved with a front end cover, the bearing blocks and the copper insert bearings are in interference fit, the copper insert bearings and the front end cover are in interference fit, and the front end cover is fastened to the front end face of the stator. The device is simple in structure and good in stability and heat dissipation performance.

Description

technical field [0001] The invention relates to the field of motor equipment, in particular to an electric spindle. Background technique [0002] The electric spindle is a new technology in the field of CNC machine tools that integrates the machine tool spindle and the spindle motor. Together with the linear motor technology and high-speed tool technology, it pushes high-speed machining into a new era. The electric spindle includes the electric spindle itself and its accessories, including the electric spindle, high-frequency frequency conversion device, oil mist lubricator, cooling device, built-in encoder, tool change device, etc. The rotor of the motor is directly used as the main shaft of the machine tool, and the housing of the main shaft unit is the motor base, and cooperates with other parts to realize the integration of the motor and the main shaft of the machine tool. [0003] The electric spindle is composed of a shellless motor, a spindle, a bearing, a spindle un...

AI Technical Summary

Problems solved by technology

[0005] At present, the rear end bearing of the electric spindle usually adopts a double-bearing structure design. When the electric spindle rotates at a speed of up to 100,000 rpm, the bearing heats up seriously. end bearing for heat dissipation

At the same time, there is heat transfer between the electric spindle stator and the back-end bearing, which will cause the working temperature of the back-end bearing to be too high

There are axial runout and radial runout problems at the front end of the electric spindle mandrel

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