JPS6152321B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hydrostatic type fluid thrust bearing consisting of a plurality of segment bodies having support points on the same circumference, in which the center of the fluid pocket and the bearing support point are shifted from each other, so that the rotating body has a circular shape. It is designed to apply fluid pressure in the circumferential direction.

This type of hydrostatic thrust bearing is applied, for example, to the vertical balance test machine shown in FIG. In the figure, 1 is a pedestal, 2 is a main body fixed to the pedestal 1, 3 is a rotating shaft, and 4 is a main table as a rotating body fixed to the upper part of the rotating shaft 3.
The rotating shaft 3 is connected to an upper support 2a and a lower support 2 of the main body 2.
It is rotatably supported in the axial direction via two hydrostatic journal bearings 5 and 6 fixed to b, and supports the radial load applied to the rotating shaft 3 by the fluid journal bearings 5 and 6. do. 7 and 8 are pressure fluid piping, and fluid journal bearings 5 and 6
Pressurized fluid is supplied to the fluid pockets 9, 10 of.
A hydrostatic type fluid thrust bearing 11 is provided between the main table 4 and the upper support 2a, so that the thrust load applied to the main table 4 is supported by the fluid thrust bearing 11.

This fluid thrust bearing 11 is arranged and fixed to a pivot 12 divided into six equal parts on the same circumference of the upper support 2a.
A disc spring 13 is provided on the disc spring 13, and a segment body 14 is placed on the disc spring 13. The segment body 14 is made up of a set of six bearing parts, but only one of them is shown in the figure. The illustration of the bearing portion is omitted.

The center of the fluid pocket 15 provided on the upper surface of each segment body 14 is located on a vertical line passing through the center point of the pivot 12, and pressure fluid is supplied from a fluid passage 15a opening at the center of the fluid pocket 15.

An auxiliary table 16 is fixed onto the main table 4 by detachable bolts 17. 1
8 is a fluid pocket provided on the lower surface of the auxiliary table 16, and 19 is a fluid passage for supplying pressure fluid to the fluid pocket 18. Further, reference numeral 20 indicates pins for positioning the auxiliary table, and two pins are provided at symmetrical positions with the rotating body 4 as the center.

A worm wheel 21 is fixed to the lower end of the rotating shaft 3, and the rotating shaft 3 is rotated via a worm (not shown) that meshes with the worm wheel 21.

Auxiliary table 16 of the balance tester with the above configuration
The object to be measured is placed and fixed thereon, and a drive device (not shown) is driven to rotate the rotating shaft 3 via the worm wheel 21, thereby rotating the main table 4 and the auxiliary table 16 at a predetermined number of rotations. Measures the unbalance amount of the object to be measured.

fluid pockets 9 of fluid journal bearings 5, 6;
10 and the segment body 14 of the fluid thrust bearing 11
Pressure fluid is supplied to the fluid pocket 15 from a fluid drive device (not shown).

In this way, with the object to be measured rotated, fluctuations in the fluid pressure in the fluid pockets 9, 10 of the fluid journal bearings 5, 6 are measured, and the unbalance amount and residual unbalance of the object to be measured are determined. Find direction etc.

When performing measurements using this balance tester,
It is necessary to improve measurement accuracy by minimizing errors based on the amount of unbalance inherent in the balance tester and the amount of unbalance caused by the method of mounting the object to be measured. The balance was corrected by installing it in a symmetrical position that was reversed 180 degrees from the mounting position and taking further measurements.

When inverting the object to be measured, use auxiliary table 1.
6, remove the bolt 17, and manually rotate the auxiliary table 16 by 180 degrees with respect to the main table 4, or supply pressure fluid to the fluid pocket 18 of the auxiliary table 16 to rotate the auxiliary table 16. 16 from the main table 4, the main table 4 is moved manually or by driving the rotating shaft 3 to the auxiliary table 16.
You have to rotate it 180 degrees. It is not easy to manually rotate the auxiliary table 16 or the main table 4 with the object to be measured attached to the auxiliary table 16 because it requires a lot of effort. Since the circumferential speed of the positioning pin 20 increases, there is a problem in that positioning of the positioning pin 20 becomes difficult.

This invention was made to solve the above problem, and by shifting the center of the fluid pocket of a hydrostatic type fluid thrust bearing in a certain direction from the center of the pivot, the load applied to the fluid thrust bearing can be reduced. This bearing generates a force component in a direction perpendicular to the bearing, and applies fluid pressure in the circumferential direction to the rotating body supported by the bearing.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 show an embodiment in which the present invention is applied to a hydrostatic thrust bearing in the balance tester described in FIG. 1.

In the figure, reference numeral 4 is a main table of the balance tester, and a fluid thrust bearing 11 is constituted by segment bodies 14 arranged concentrically with this main table 4 and divided into six equal parts. A is the center of the pivot 12 (the center of the segment body 14) that supports each segment body 14 via the disc spring 13.

The fluid pocket 15 of each segment body 14 is provided at a position where its center B is shifted by a certain distance in a certain direction (counterclockwise in the drawing) on a circumferential line passing through the center A of the pivot.

The fluid passage 15a leading to the fluid pocket 15 is
An opening is provided at the center B of the bottom of the fluid pocket 14.

With the above configuration, each segment body 14
When a constant pressure fluid is supplied to the fluid pocket 15 of the segment body 1, as shown in FIG.
4 (pivot center A) and the center point of action of the pressure fluid on the segment body 14 (fluid pocket center B), a force couple is generated due to the deviation,
The segment body 14 is inclined in an eccentric direction (indicated by an arrow in the figure) with the center A of the pivot 12 as a fulcrum.

The fluid pressure P when the segment body 14 is in an inclined state is acting perpendicularly to the segment body 14 as shown in the vector diagram in FIG. A component force Pv in the direction and a component force Ph in the horizontal direction are generated. This vertical component force Pv acts in the direction of the load applied to the main table 4, while the horizontal component Ph acts in the circumferential direction of the main table 4.

Therefore, when the fluid thrust bearing with the above configuration is applied to the balance test machine shown in Fig. 1,
When inverting the object to be measured, use the auxiliary table 16.
After removing the positioning pin 20 of When pressure fluid is supplied to the fluid pocket 15 of the body 14, the horizontal component force Ph of the pressure fluid acts in the circumferential direction of the main table 4 to provide rotational force, so the main table 4 rotates at a slow speed. Therefore, the main table 4 is moved from its original position.
When the object to be measured is rotated 180 degrees and the positioning pin 20 is dropped into a pin hole located symmetrically to the positioning pin 20, the object to be measured is automatically reversed by 180 degrees.

In addition, when driving the rotating shaft 3 for a balance test of the object to be measured, the fluid thrust bearing is used to control the component force Pv that acts perpendicularly to the main table 4.
can support the thrust load applied to the main table 4, and furthermore, since the component force Ph in the direction perpendicular to the direction of the thrust load acts in the circumferential direction of the main table 4 and gives rotational force, The driving force of the rotating shaft 3 is reduced.

In the above embodiment, a case has been described in which the hydrostatic fluid thrust bearing is composed of six segment bodies, but the number of segment bodies can be appropriately selected as necessary.

Furthermore, the shapes of the segment bodies and fluid pockets, the opening positions of the fluid passages, etc. are not limited to the above embodiments, and can be arbitrarily set.

Further, the centers of the fluid pockets may be located on circumferences having different diameters with respect to the support points of each segment body, and the eccentric distances between them may be made different for each segment body.

This invention is not limited to the balance testing machine described in the above embodiment, but can be widely applied to any type or model of any device that uses a fluid thrust bearing that divides a rotating body and supports it in the axial direction. can.

As explained above, in a hydrostatic fluid thrust bearing consisting of a plurality of segment bodies divided and arranged on the same circumference, the center of the fluid pocket of each segment body is connected to the center support of the segment body. It is installed at a position shifted in a certain direction along the circumferential direction from the point, so that only the rotational force from the pressure fluid supplied to the fluid pocket of each segment body can be applied to the rotating body when it is stopped, causing it to rotate. It consists of

Therefore, according to the present invention, when it is necessary to rotate a rotating body at a speed slower than the specific rotational speed of the rotating shaft, it is possible to rotate the rotating body at a speed that is slower than the specific rotation speed of the rotating shaft, and the desired rotation speed can be achieved with extremely simple operation and without the need for human power. You can get the effect.

Further, according to the present invention, even when the rotating shaft is rotated by the drive device, the rotational force by the pressure fluid supplied to the fluid pocket of each segment body is applied to the rotating body. It becomes possible to reduce the load on

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a vertical balance tester equipped with a hydrostatic thrust bearing, and Figure 2 is a
A plan view showing an embodiment of the present invention, FIG. 3 is a sectional view taken along the line -- of FIG. 2 during operation, and FIG.
It is a vector diagram of a pressure fluid. DESCRIPTION OF SYMBOLS 1... Frame, 3... Rotating shaft, 4... Main table (rotating body), 11... Hydrostatic fluid thrust bearing, 12
...Pivot, 14...Segment body, 15...
Fluid pocket, A... Center of pivot, B... Center of fluid pocket.

Claims (1)

[Claims] 1 A rotating shaft supported on a pedestal, a rotating body fixed to the rotating shaft, and a plurality of bodies arranged on the pedestal on the underside of the rotating body and whose centers are supported by support points on the same circumference. A hydrostatic fluid thrust bearing comprising a segment body and supporting the rotating body in the axial direction by supplying pressure fluid to the fluid pocket of each segment body, wherein the center of the fluid pocket of each segment body is connected to the segment body. The segment body is arranged so as to be shifted in a fixed direction along the circumferential direction from the support point of the segment body, and is configured so that only the rotational force from the pressure fluid supplied to the fluid pocket of each segment body is applied to the rotating body when it is stopped, causing it to rotate. A hydrostatic type fluid thrust bearing featuring: