JP2000055030A - Hydrostatic bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of uneven bearing clearance, wear and seizure of a bearing caused by unevenness by constituting a device so as to change press-contact force between a tapered surface on the side of a taper ring and a tapered surface on the side of an outer race by advancing and retreating amount of a screw of the taper ring. SOLUTION: By advancing and retreating a screw screwing an outside taper ring 5 and an inside taper ring 6, press-contact force among an inner peripheral tapered surface 5a of the outside taper ring 5, an inner peripheral tapered surface 6a of the inside taper ring 6 of a taper reverse to this tapered surface 5a, an outer peripheral tapered surface 3b of an outer race 3 and an inside taper ring 3a of a taper reverse to this tapered surface 3b can be changed. Because elastic deformation amount of the outer race 3 is changed and radial clearance of an outer periphery of an inner race 4 and the outer race 3, that is, upper clearance 11 and lower clearance 12 is adjusted by changing press- contact force, tightening amount of the tapered surface uniform in the radial direction can be imparted over the tire periphery and clearance can be made uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a hydrostatic sliding bearing device used for a vibration motion mechanism and the like, and more particularly to a hydrostatic sliding bearing device with a spherical seat configured so that an inner ring and an outer ring are in contact with a spherical surface.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a hydrostatic sliding bearing with a spherical seat used for a connecting portion of a driving mechanism of a shaking table.
FIG. 4 is a sectional view taken along the center line of the bearing, and FIG. 4 is a sectional view of a main part of the tapered ring insertion portion.

In FIG. 3, reference numeral 2 denotes a second shaft reciprocated by a hydraulic piston (not shown) or the like.
A second shaft housing 14 is fixed to the shaft 2, and a pin 10 is fixed to a bifurcated portion of the second shaft housing 14.
Further, an inner ring 4 is fixed to the outer periphery of the pin 10.
On the other hand, 1 is a first shaft, and a first shaft housing is fixed to the first shaft 1. 3 is an outer ring.

The outer peripheral surface 4S of the inner ring 4 has a convex spherical surface, and the inner peripheral surface 3S of the outer ring 3 has a concave spherical surface. Here, since the outer peripheral surface 4S of the inner race 4 and the inner peripheral surface 3S of the outer race 3 are arranged with a clearance, that is, the clearance 12 and the lower clearance 13, the first shaft 1 is connected to the second shaft 2. It is possible to swing in a free direction.

The outer periphery of the outer race 3 and the first shaft housing 13
A front taper ring 8 and a rear taper ring 7 are interposed at predetermined intervals in the axial direction.
The front taper ring 8 and the rear taper ring 7 have tapered surfaces 3 whose inner circumferences have tapered directions opposite to each other.
b, 3a, which are in contact with the mountain-shaped tapered surfaces 3b and 3a formed on the outer periphery of the outer ring 3 and having a high center portion and a low end portion. A plurality of bolts 9 are provided at predetermined intervals in the circumferential direction, penetrate through the inside of the rear side taper ring 8, and their male threads 9 a are screwed into female threads 7 b of the front side taper ring 7, and this is connected to the front side. By screwing into the female thread 7b of the tapered ring 7, the two tapered rings 7, 8 are pressed against the outer periphery of the outer ring 3.

In the above hydrostatic sliding bearing device, the inner ring 4
In adjusting the clearance between the outer peripheral surface of the outer ring 3 and the inner peripheral surface of the outer ring 3, that is, the upper clearance 11 and the lower clearance 12, when the bolt 9 is rotated and screwed into the rear taper ring 7, the wedges of the taper rings 7, 8 are adjusted. By the action, the tapered surface 8
a, 7a press the tapered surfaces 3b, 3a of the outer race 3 inward, the outer race 3 is elastically deformed, and its inner peripheral surface 3S is displaced inward, and the upper clearance 11 and the lower clearance 12 are changed. Therefore, by adjusting the tightening force of the bolt 9, the upper clearance 11 and the lower clearance 12 can be adjusted.

[0007]

In the conventional means for adjusting the upper clearance and the lower clearance shown in FIGS. 3 and 4, a front taper ring 8 having a reverse taper and a rear taper ring 8 having a reverse taper by a tightening force of a plurality of bolts 9. The upper clearance 11 and the lower clearance 12 are adjusted by adjusting a tightening amount (displacement amount) with the side taper ring 7.

Accordingly, in order to make the clearance uniform over the entire circumference, it is necessary to make the tightening force of the plurality of bolts 9 uniform, but the tightening force of each bolt 9 is made uniform with high precision. There are many practically difficult surfaces, and therefore, in the above-mentioned conventional one, the above-mentioned clearance tends to be non-uniform, which causes wear and seizure of the bearing surface.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydrostatic sliding bearing with a spherical surface seat, in which the radial clearance between an inner ring and an outer ring can be adjusted by simple means so as to be uniform over the entire circumference. It is an object of the present invention to prevent the occurrence of uniformity and the occurrence of wear and seizure of the bearing caused thereby.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and the first means, which is the gist thereof, is:
An inner ring connected to one shaft via a pin joint and an outer ring connected to the other shaft are formed by fitting the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring into spherical surfaces and fitting them. In the pressure bearing device, the outer peripheral surface of the outer ring is formed as two tapered surfaces having a central portion having a high mountain-shaped inverted taper, and the outer peripheral surface of the outer ring and the inner peripheral surface of a member attached to the other shaft are formed. In between, two tapered rings having a tapered surface in contact with the tapered surface of the outer ring on the inner periphery are screwed to each other and interposed. The hydrostatic bearing device is characterized in that a pressure contact force between the tapered surface and the outer ring side tapered surface is changed.

A second means is the first means, wherein the two tapered rings are formed along the axial direction of the inner periphery, and the tapered ring of the outer ring is provided continuously with a screw and a female screw. An outer taper ring having a tapered surface in contact with one of the surfaces; And an inner tapered ring having a tapered surface in contact therewith.

According to the above-mentioned means, the screw for screwing the outer taper ring and the inner taper ring is advanced and retreated, so that the inner taper surface of the inner taper surface of the outer taper ring and the inner taper ring formed in the reverse taper are formed. It is possible to change the pressure contact force between the inner peripheral taper surface and two mountain-shaped oppositely tapered surfaces on the outer periphery of the outer ring that are in contact with the tapered surfaces.

The amount of elastic deformation of the outer ring is changed by the change of the pressing force, whereby the radial clearance between the inner circumference of the outer ring and the outer circumference of the inner ring can be adjusted.

Therefore, according to the above-mentioned means, the outer tapered ring and the inner tapered ring are connected by a screw formed over the entire circumference, and the tapered surfaces of both tapered rings and the outer ring are adjusted by the amount of advance and retreat of the screw. The radial clearance between the inner ring and the outer ring is adjusted by changing the amount of elastic deformation of the outer ring by changing the pressure contact force with the tapered surface of the outer ring. It is possible to provide a uniform tightening amount of the tapered surface in the direction, and it is possible to make the radial clearance uniform.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a cross-sectional view along a bearing center line of a hydrostatic slide bearing with a spherical seat according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of a tapered ring insertion portion.

In FIG. 1, reference numeral 2 denotes a second shaft reciprocated by a hydraulic piston (not shown) or the like.
A second shaft housing 14 is fixed to the shaft 2, and a pin 10 is fixed to a bifurcated portion of the second shaft housing 14.
Further, an inner ring 4 is fixed to the outer periphery of the pin 10.
On the other hand, reference numeral 1 denotes a first shaft, on which the first housing is fixed. Reference numeral 3 denotes an outer ring, the details of which will be described later.

The outer peripheral surface 4S of the inner ring 4 has a convex spherical surface,
The inner peripheral surface 3S has a concave spherical surface, and the two are in sliding contact with each other to form a spherical bearing. Here, since the outer peripheral surface 4S of the inner race 4 and the inner peripheral surface 3S of the outer race 3 are arranged with a clearance, that is, the clearance 12 and the lower clearance 13, the first shaft 1 is connected to the second shaft 2. It is possible to swing in a free direction.

The outer peripheral surface of the outer ring 3 is formed with mountain-shaped tapered surfaces 3a and 3b having a high center and a low end.
And, between the outer peripheral surface (tapered surface 3a, 3b) of the outer ring 3 and the inner peripheral surface 13a of the first shaft housing 13
An outer tapered ring 5 and an inner tapered ring 6 whose outer peripheral surface 3c is fitted to the inner peripheral surface 13a are interposed.

As shown in FIG. 2, the outer taper ring 5 has a female thread 5b formed over a predetermined length of the inner circumference thereof. The tapered surface 5a has the same gradient as the tapered surface 3b on the side.

The inner taper ring 6 has a male screw 6b formed on the outer periphery thereof to be screwed with the female screw 5b of the outer taper ring 5, and the inner peripheral surface is the same as the tapered surface 3a on the other side of the outer ring 3. The tapered surface 6a has a gradient, that is, a tapered surface 5a of the outer tapered ring 5 and a tapered surface having an inverse taper.

In adjusting the clearance between the outer peripheral surface 4S of the inner race 4 including the upper clearance 11 and the lower clearance 12 and the inner peripheral surface 3S of the outer race 3 in the hydrostatic sliding bearing configured as described above, an inner taper is required. Rotate the ring 6,
When the male screw 6b is screwed into the female thread 5b of the outer taper ring 5, the advance of the screw causes the outer taper ring 5
The inner peripheral taper surface 5a and the taper surface 6a of the inner taper ring 6 having the reverse taper are brought closer to the center side and pressed against the mountain-shaped tapered surfaces 3a and 3b of the outer ring 3, respectively. It elastically deforms inward. This allows the outer ring 3
(The radial clearance including the upper clearance 11 and the lower clearance 12) between the inner periphery of the inner ring and the outer periphery of the inner ring becomes smaller.

When the inner tapered ring 6 is rotated in the opposite direction to the above to reduce the amount of screwing into the outer tapered ring 5, the tapered surfaces 5a and 6a of the outer tapered ring 5 and the inner tapered ring 6 and the tapered surface of the outer ring are reduced. The pressing force between the outer rings 3b and 3a is reduced, the deformation of the outer ring 3 is reduced, and the clearance in the radial direction is enlarged.

As described above, according to the above-described embodiment, the screw that screwes the outer taper ring 5 and the inner taper ring 6 is advanced and retracted, so that the inner taper surface 5a of the outer taper ring 5 and the The pressure contact force between the inner tapered surface 6a of the inner tapered ring 6 and the tapered surface 3b of the outer ring 3 and the tapered surface 3a of the reverse taper can be changed. According to the above-described embodiment, the amount of elastic deformation of the outer ring 3 is changed by the change in the pressing force, and the radial clearance between the outer periphery of the inner ring 4 and the inner periphery of the outer ring 3, that is, the upper clearance 11 and the lower clearance The gap 12 can be adjusted.

Therefore, according to the above embodiment, the outer tapered ring 5 and the inner tapered ring 6 are screwed together with the screws 5b, 6b formed over the entire circumference, and the elasticity of the outer ring 3 is determined by the amount of advance and retreat of these screws. Since the amount of deformation is changed to adjust the radial clearance between the outer peripheral surface of the inner race 4 and the inner peripheral surface of the outer race 3, a uniform amount of taper surface tightening in the radial direction is provided over the entire circumference. And the clearance can be made uniform.

[0025]

The present invention is configured as described above.
According to the present invention, the outer taper ring and the inner taper ring are joined by a screw formed over the entire circumference, and the amount of advance and retreat of the screw causes the taper surface of both the taper ring and the taper surface of the outer ring to move. By changing the pressing force and changing the amount of elastic deformation of the outer ring, the radial clearance between the inner ring and the outer ring is adjusted. Ttenai
A uniform amount of tightening of the tapered surface in the radial direction can be given over the entire circumference of the outer ring, and the radial clearance can be made uniform.

Accordingly, it is possible to prevent the occurrence of wear and seizure of the bearing caused by the unevenness of the radial clearance, and to obtain a highly durable hydrostatic bearing device.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along a bearing center line of a hydrostatic slide bearing with a spherical seat according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a tapered portion in the embodiment.

FIG. 3 is a diagram showing a conventional example.

FIG. 4 is an enlarged view of a tapered portion in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st shaft 2 2nd shaft 3 Outer ring 3a, 3b Tapered surface (outer ring) 4 Inner ring 5 Outer tapered ring 5a Tapered surface (outer tapered ring) 5b Female thread 6 Inner tapered ring 6a Tapered surface (inner tapered ring) 6b Male screw 10 Pin 11 Upper Clearance 12 Lower Clearance 13 First Shaft Housing 14 Second Shaft Housing

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Meiji Koike 6-16-1, Enoura, Hikoshima, Shimonoseki City F-term in Shimonoseki Shipyard, Mitsubishi Heavy Industries, Ltd. (Reference) 3J033 AA05 GA01 GA20

Claims (2)

[Claims] An inner race connected to one shaft via a pin joint and an outer race connected to the other shaft are formed by forming the outer peripheral surface of the inner race and the inner peripheral surface of the outer race into spherical surfaces. In the combined hydrostatic bearing device, the outer peripheral surface of the outer ring is formed on two tapered surfaces having a central portion having a high mountain-shaped inverted taper, and is attached to the outer periphery of the outer ring and the other shaft. Two tapered rings having a tapered surface abutting on the tapered surface of the outer ring are interposed between the member and the inner periphery thereof by screw connection with each other. A hydrostatic bearing device wherein the pressure contact force between the tapered surface on the tapering side and the tapered surface on the outer ring side is changed. 2. The two tapered rings have a screw formed along the axial direction of the inner periphery and a tapered surface which is connected to the internal thread and is in contact with one of the tapered surfaces of the outer ring. An outer taper ring, and an inner taper ring in which a male screw to be screwed to the female screw of the outer taper ring is formed on the outer periphery, and a taper surface which is in contact with the other of the taper surfaces of the outer ring is formed on the inner periphery. The hydrostatic bearing device according to claim 1, wherein the hydrostatic bearing device is constituted by: