Bidirectional pressure regulating pre-tensioner for electric spindle angular contact ball bearing

Abstract

The invention relates to a bidirectional pressure regulating pre-tensioner for an electric spindle angular contact ball bearing and belongs to the field of mechanical design and manufacturing. The bidirectional pressure regulating pre-tensioner comprises a pressure ring (a), a load-adding sheath (b), an elastic element (c) and a bidirectional force sensor (d), wherein the pressure ring is formed by a bearing outer ring supporting sleeve, a bearing sealing ring and a thrust ring; the load-adding sheath consists of a left-handed stud, a hexagonal sleeve and a right-handed stud; and the elastic element consists of both left and right fixed plates, two tension spring sleeves which are symmetrically distributed, two pull rods which are symmetrically distributed, four compression springs, two pressure rods which are symmetrically distributed, and two pressing sleeves which are symmetrically distributed. The bidirectional pressure regulating pre-tensioner realizes bidirectional quantitive constant-pressure pre-tensioning on a bearing pack, can ensure that an axial pre-tensioning force of the bearing pack is constant when the electric spindle bearing generates axial displacement, ensures rotating accuracy and rigidity of the electric spindle bearing in the high-speed rotating process, also can quantitively regulate the pre-tensioning force and avoids the phenomenon that the bearing is blocked and burnt down due to excessively high heat generation.

Description

technical field [0001] The invention discloses a two-way quantitative adjustable preloading device, which is mainly used for constant pressure preloading of main shaft bearings. The invention belongs to the field of mechanical design and manufacture. Background technique [0002] High-speed precision machining is an important development direction in the field of machinery manufacturing, and the electric spindle is the core functional component of high-speed machining machine tools. The electric spindle angular contact ball bearing adopts constant pressure preload to achieve various effects such as increasing bearing stiffness, reducing bearing vibration, improving shaft rotation accuracy, and reducing rolling element revolution slipping. Constant pressure preload refers to the axial preload of the bearing An axial preload method that remains unchanged during use, and a certain amount of preload is obtained by adjusting the compression of the spring. [0003] The traditiona...

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Problems solved by technology

[0003] The traditional constant pressure preloading method can only realize one-way preloading, and the scope of application is limited. With the increase of axial displacement, the preloading force changes significantly, which cannot keep the preloading force constant when the electric spindle is running at high speed, and It is not possible to directly quantitatively display the magnitude of the pretightening force when the spindle is running

There is also a hydraulic preloading method, but its structure is complicated, and the manufacturing and maintenance costs are high.

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