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Hybrid cone bearing shaft system and precision machine tool
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A precision machine tool, dynamic and static pressure technology, applied in the field of machinery, can solve the problems of high processing precision and high processing cost, and achieve the effect of reducing processing difficulty, reducing processing cost and improving work efficiency.
Inactive Publication Date: 2018-06-01
UNIV OF SHANGHAI FOR SCI & TECH
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[0004] According to the basic principle of gas (air) or liquid (oil) dynamic and static pressure technology, the liquid or gas medium enters the multiple chambers of the concave cone surface of the cone bearing respectively. When the convex cone rotates, the medium flows from multiple chambers. Dynamic pressure is formed in the chamber. The higher the speed of the convex cone, the greater the density of the medium, the smaller the gap between the concave and convex cones, and the greater the dynamic pressure. Because there is a certain gap between the concave and convex cone surfaces, the convex cone floats, and it is in a position when rotating. Non-contact state, but the machining accuracy of the concave cone surface and the cavity of the cone bearing is high, and the machining cost is high
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Embodiment 1
[0034] like figure 1 As shown, the hydrostatic cone bearing shaft system 100 includes two hydrostatic cone bearings and a rotating shaft 40 .
[0035] The hydrostatic cone bearing includes a housing assembly 10 , a rotating member 20 and a support seat 30 .
[0036] like 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] like Figure 4 As shown, the receiving part 11 includes a concave tapered 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 rotating shaft 40 in the horizontal direction at the center of t...
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] The other structure of this embodiment is the same as that of Embodiment 2, except that the top surfaces of the static pressure bushing 12 and the dynamic pressure bushing 13 are higher than the inner concave tapered 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 tapered 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 hybrid cone bearing shaft system and a precision machine tool. The hybrid cone bearing shaft system comprises at least one hybrid cone bearing and a rotary shaft. Each hybrid cone bearing is provided with a supporting base, a containing assembly and a rotary part; each containing assembly comprises a containing part, a plurality of static pressure bushings and a plurality of dynamic pressure bushings; each containing part is provided with a plurality of static pressure channels and dynamic pressure channels; the static pressure bushings are arranged at openings of first recessed cavities; the cross section of a dynamic pressure recessed cavity of each dynamic pressure bushing is gradually enlarged from the bottom to an opening; the multiple static pressure bushings and the multiple dynamic pressure bushings are arranged on an inwards-concave conical face along at least one arrangement plane; and each arrangement plane is a plane perpendicular to the rotary axis of the corresponding rotary part. In the working state, convex cones of the hybrid cone bearings do not make contact with the concave conical faces during rotation, compared with hybrid column bearings, the hybrid cone bearings has the better concentric adaptability, and thus the dynamic rotation precision of the rotary shaft of the cone bearing shaft system can be improved through a gas or liquid hybrid technology.
Description
technical field [0001] The invention belongs to the field of machinery, and in particular relates to a dynamic and static pressure cone 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 use gas or liquid dynamic and static pressure technology combined with a cone structure 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) dynamic and static pressure technology, the liquid or gas medium enters the multiple chambers of the concave cone surface of the cone bearing respectively. When the convex cone rotates, the medium flows from multiple chambers. Dynamic pressure is formed in the chamber. The higher the speed of the convex cone, the greater the density of the medium, the smaller the ...
Claims
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Application Information
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