Hydrostatic bearing apparatus and machine-tool main-spindle apparatus
A fluid bearing and static pressure technology, applied in the direction of bearings, shafts and bearings, grinding machine parts, etc., can solve problems such as power loss, and achieve the effect of reducing power loss and restraining power loss.
Inactive Publication Date: 2016-08-03
JTEKT CORP
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Problems solved by technology
Accompanied by this, the hydrostatic fluid bearing device will generate a large velocity gradient near the surface of the rotating shaft, so there is concern about power loss due to large fluid shear resistance
In addition, the interior of the concave part becomes a strong turbulent flow with a Reynolds number of 20,000 to 30,000, so there is concern about the generation of a large velocity gradient near the surface of the rotating shaft and power loss due to large fluid shear resistance.
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[0025] The above and other features and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which the same reference numerals are assigned to the same elements.
[0026] Hereinafter, a hydrostatic fluid bearing device and a spindle device for a machine tool using the hydrostatic fluid bearing device as one embodiment for carrying out the present invention will be described with reference to the drawings.
[0027] figure 1 It is a plan view showing the overall structure of a grinding machine 10 as an example of a spindle device for a machine tool using the hydrostatic fluid bearing device according to the embodiment. figure 2 is a right side view of the grinder 10 . In addition, in figure 2 The illustration of the workpiece holding device 150 provided with the holding table 151 is omitted. Here, in all drawings showing the X-axis, Y-axis, and Z-axis, the X-axis, Y-a...
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The invention relates to a hydrostatic bearing apparatus and a machine-tool main-spindle apparatus. In the hydrostatic bearing apparatus, a hydrostatic portion (18) has a bearing clearance (20), a bearing surface portion (22), a plurality of pockets (24), and a ridge part (30). A groove part (40) is provided with a side groove part, an upstream groove part (44) and a downstream groove part (46). The upstream groove part (44) is provided with a flow path (16) (a supplying path). The bearing clearance (20) is provided with a first bearing clearance (C) and a second bearing clearance (H), and the second bearing clearance (H) is larger than the first bearing clearance (C). Under the condition that the density of a lubricant (R) is [rho], the viscosity coefficient is [mu], the circumferential speed of a rotation shaft is U, the second bearing clearance is H, the Reynolds number Re in the second bearing clearance is expressed as Re=[rho]*U*H / [mu], and in the state that the rotation shaft is rotationally supported, the liquid flow of the lubricant (R) in the second bearing clearance (H) is characterized in that Re<2000.
Description
technical field [0001] The present invention relates to a hydrostatic fluid bearing device and a spindle device for machine tools using the hydrostatic fluid bearing device. Background technique [0002] Conventionally, there is known a hydrostatic fluid bearing device that supports a rotating shaft that rotates at high speed, such as a spindle of a machine tool, using the static pressure of a pressurized fluid such as lubricating fluid. For example, JP 2001-304260 A discloses a technique of a hydrostatic fluid bearing device including a bearing metal fitting having a static pressure portion for rotatably supporting a rotary shaft. In this technology, the static pressure part has: a bearing surface having a bearing gap between the surface of the rotating shaft; Fluid such as liquid, thereby using fluid pressure (static pressure) to support the rotating shaft. [0003] However, if Figure 9 , Figure 10 As shown, the lubricating fluid used in the hydrostatic fluid bearing ...
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IPC IPC(8): B23B19/02
CPCB23Q1/70B23Q1/385B24B5/04B24B41/04F16C32/0659F16C2322/39
Inventor 大和宏树
Owner JTEKT CORP