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A dynamic and static pressure hemispherical bearing shaft system and precision machine tool

A technology of precision machine tools and hemispheres, applied in the directions of bearings, shafts and bearings, grinding machine parts, etc., can solve the problems of high processing accuracy and processing cost, reduce processing difficulty, improve dynamic rotation accuracy, and improve work efficiency. Effect

Active Publication Date: 2020-05-29
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing accuracy and processing cost of the concave and convex balls, chambers and spherical surfaces of the ball bearing are very high

Method used

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  • A dynamic and static pressure hemispherical bearing shaft system and precision machine tool
  • A dynamic and static pressure hemispherical bearing shaft system and precision machine tool
  • A dynamic and static pressure hemispherical bearing shaft system and precision machine tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the hydrostatic hemispherical bearing shaft system 100 includes two hydrostatic hemispherical bearings and a rotating shaft 40 .

[0035] The dynamic and static pressure hemispherical bearing includes a containing assembly 10 , a rotating member 20 and a support seat 30 .

[0036] Such as figure 2 As shown, the containing assembly 10 includes a containing part 11 , a plurality of static pressure bushes 12 and a plurality of dynamic pressure bushes 13 .

[0037] Such as Figure 4 As shown, the receiving element 11 includes a concave hemispherical surface 111 , an outer surface 112 , a plurality of static pressure channels 113 , a plurality of dynamic pressure channels 114 and a through hole 116 .

[0038] However, in some occasions where the shaft does not need to pass through, the receiving part 11 may not be provided with the through hole 116 . In this embodiment, the receiving part 11 is provided with a through hole 116 for passing the ...

Embodiment 2

[0054] The other structure of this embodiment is the same as that of Embodiment 2, the difference is that the shape of the mouth of the static pressure cavity 121 is any one of circle, ellipse, square, rectangle and trapezoid, and the shape of the mouth of the dynamic pressure cavity 131 is It is any one of circular, elliptical, square, rectangular and trapezoidal, and the section of the dynamic pressure cavity 131 along the layout plane is crescent-shaped or both ends of the section along the layout plane are wedge-shaped.

[0055] In the second embodiment, the shape of the opening of the static pressure cavity 121 is oval, the shape of the cavity of the dynamic pressure cavity 131 is trapezoidal, and the section of the dynamic pressure cavity 131 along the layout plane is crescent-shaped.

Embodiment 3

[0057] Other structures of this embodiment are the same as those of Embodiment 2, except that the top surfaces of the static pressure bushing 12 and the dynamic pressure bushing 13 are higher than the concave hemispherical surface 111. In Embodiment 3, the static pressure bushing 12 and the dynamic pressure bushing 13 The distance between the top surface of the bushing 13 and the concave hemispherical surface 11 is 0.5mm.

[0058] The axial section of the static pressure bush 12 may be stepped, and the axial section of the dynamic pressure bush 13 may also be stepped.

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Abstract

The invention relates to a dynamic and static pressure semi-sphere bearing shaft system and a precision machine tool. The dynamic and static pressure semi-sphere bearing shaft system comprises at least one dynamic and static pressure semi-sphere bearing and a rotating shaft, each dynamic and static pressure semi-sphere bearing is provided with a supporting seat, an accommodating assembly and a rotating part, and each accommodating assembly comprises an accommodating part, a plurality of static pressure linings and a plurality of dynamic pressure linings; each accommodating part is provided with a plurality of static pressure channels and a plurality of dynamic pressure channels, the static pressure linings are arranged at openings of first concave cavities, and the dynamic pressing liningsare arranged at openings of second concave cavities; and the cross sections of dynamic pressure concave cavities are gradually expanded from the bottoms to the openings, and the plurality of static pressure linings and the plurality of dynamic pressure linings are arranged on one inner concave semi-spherical surface along at least one arrangement plane. According to the dynamic and static pressure semi-sphere bearing shaft system, during the working state, when a convex ball rotates, the convex ball is not in contact with a concave ball surface; and relative to dynamic and static pressure cone bearings, the dynamic and static pressure semi-sphere bearings have better concentricity matching degree, and therefore, dynamic rotation precision of the rotating shaft on the bearing shaft systemcan be improved by adopting a gas or liquid dynamic and static pressure technology.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to a dynamic and static pressure hemispherical bearing shaft system and a machine tool. Background technique [0002] Most of the revolving pairs in the prior art are in a contact state when rotating, and the rotating precision and efficiency are not high. [0003] Bearings that combine gas or liquid dynamic and static pressure technology with spherical structures are currently one of the most effective ways to improve the rotation accuracy of the spindle. [0004] According to the basic principle of gas (air) or liquid (oil) static pressure technology, the liquid or gas medium with pressure enters the concave spherical surface of the ball bearing respectively into multiple concave cavities, and forms static pressure to float the convex ball. When rotating with the matching convex ball, the concave and convex balls are in a non-contact state and can withstand external forces; t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C32/06B23B19/02B24B41/04
CPCB23Q1/70B24B41/04F16C32/06F16C2322/39
Inventor 黎永明沈景凤黎斌
Owner UNIV OF SHANGHAI FOR SCI & TECH