CN111594548A - A hydrostatic bearing sleeve - Google Patents

Abstract

The invention discloses a bearing sleeve of a hydrostatic bearing. The bearing sleeve is provided with a sleeve connection hole in the center of the end face of the bearing sleeve, an annular protrusion is arranged on the outer periphery of the bearing sleeve near the left end, and a sealing hole is arranged at the left end of the bearing sleeve. , the right end is sleeved with a static pressure sleeve, the center of the end face of the static pressure sleeve is provided with a left and right connecting shaft hole, and the position of the outer periphery of the static pressure sleeve close to the right end is provided with a ring-shaped limit protrusion, and the limit protrusion is clamped On the outer side of the right end of the bearing sleeve, the outer periphery of the limiting protrusion is provided with an oil drain area which is communicated with the shaft hole. This hydrostatic bearing sleeve not only ensures the rigidity of the bearing sleeve, but also maximizes the elasticity of the bearing sleeve. Even if the oil temperature changes, the oil film gap between the shaft and the bearing sleeve will not change, thus making up for The prior art has the disadvantages of easy change of oil film, easy deformation of the bearing and low running precision of the bearing, so that the bearing can reach the precision of 0.2u m, and the rotation speed can reach 10000 rpm.

Description

A hydrostatic bearing sleeve

technical field

The invention relates to the field of hydrostatic bearings, in particular to a bearing sleeve of a hydrostatic bearing.

Background technique

A hydrostatic bearing is a type of sliding bearing that uses a pressure pump to forcibly pump pressure lubricant into the tiny gap between the bearing and the shaft. It is mainly used in fields that often need to run at low speed but require high bearing capacity, high rotation accuracy and high speed, such as various heavy-duty machine tools and high-precision machine tools.

At present, most of the hydrostatic bearing sleeves on the market are made of steel or cast iron. This kind of structure has strong rigidity, but the elasticity is extremely small. The thickness of the oil film is easy to change during the operation of the sleeve, so that the running accuracy of the hydrostatic bearing cannot be improved, so that the accuracy of the hydrostatic bearing is relatively backward in the world. The high-precision hydrostatic bearing required in China is completely dependent on imports.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a hydrostatic bearing bearing sleeve which has high elasticity and is not easily deformed by temperature changes so as to ensure the running accuracy of the bearing.

In order to solve the above technical problems, the present invention is achieved by the following technical solutions: a hydrostatic bearing bearing sleeve, which has a bearing sleeve made of alloy, and the center of the end face of the bearing sleeve is provided with a left-right communication circular socket hole , the outer circumference of the bearing sleeve near the left end is provided with an annular protrusion, the left end of the bearing sleeve is provided with a sealing hole concentric with the socket hole, and the right end is socketed with a static pressure sleeve matched with the socket hole, the static pressure sleeve It is a copper sleeve, the center of its end face is provided with a shaft hole that communicates with left and right, and the position of the outer periphery of the static pressure sleeve close to the right end is provided with a limit protrusion of annular structure, the limit protrusion is clamped on the outer side of the right end of the bearing sleeve, and the limit is The outer periphery of the bit protrusion is provided with an oil drain area which is communicated with the shaft hole.

Preferably, the oil drainage area has at least two.

Preferably, the sealing hole is a countersunk hole, and a sealing ring embedded in the sealing hole is provided.

Preferably, the annular protrusion at the left end of the bearing sleeve is provided with a plurality of assembling holes that communicate with each other.

Preferably, the left end of the static pressure sleeve sleeved in the bearing sleeve is connected to the right end of the sealing hole.

Preferably, the right end face of the static pressure sleeve is provided with an annular static pressure groove that is concentric with the shaft hole.

Preferably, an oil guide groove communicated with the right end face of the static pressure sleeve is provided at the position of the inner wall of the shaft hole corresponding to the oil drain area.

Preferably, the left and right ends of the inner shaft hole of the static pressure sleeve are provided with outwardly expanding guide flares.

Compared with the prior art, the present invention has the advantages that the hydrostatic bearing sleeve not only ensures the rigidity of the bearing sleeve, but also maximizes the elasticity of the bearing sleeve. The oil film gap between the sleeves will not change, which makes up for the shortcomings of the prior art that the oil film is easy to change, the bearing is easy to deform, and the bearing operation accuracy is not high, so that the bearing can reach an accuracy of 0.2u m, and the speed can reach 10,000 rpm /minute.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings.

1 is a cross-sectional view of the internal structure of a hydrostatic bearing bearing sleeve of the present invention;

2 is a cross-sectional view of the internal structure of a bearing sleeve in a hydrostatic bearing bearing sleeve of the present invention;

3 is a cross-sectional view of the internal structure of an axial thrust static pressure sleeve in a hydrostatic bearing bearing sleeve of the present invention;

FIG. 4 is a cross-sectional view of the structure of A in FIG. 3 .

In the figure: 1, bearing sleeve; 11, socket hole; 12, sealing ring; 13, sealing hole; 14, assembly hole; 2, static pressure sleeve; 21, shaft hole; 22, oil drain area; 23, static pressure groove; 24, oil guide groove.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments:

A hydrostatic bearing bearing sleeve shown in FIG. 1 has a bearing sleeve 1 made of alloy. As shown in FIG. 2 , the center of the end face of the bearing sleeve 1 is provided with a circular sleeve connection hole 11 communicating with the left and right. 1. An annular protrusion is provided on the outer periphery near the left end. The left end of the bearing sleeve 1 is provided with a sealing hole 13 that is concentric with the socket hole 11. The sealing hole 13 is a countersunk hole. The sealing ring 12 fitted in the bearing sleeve 1 ensures the sealing performance in the bearing sleeve 1; 2. Its left end is connected to the right end of the sealing hole 13; as shown in Figure 3, the static pressure sleeve 2 is a copper sleeve, and the center of its end face is provided with a left and right connecting shaft hole 21, and the outer periphery of the static pressure sleeve 2 is set near the right end. There is a limit protrusion with an annular structure, the limit protrusion is clamped on the outer side of the right end of the bearing sleeve 1, and the outer periphery of the limit protrusion is provided with an oil drain area 22 that communicates with the shaft hole 21; the bearing sleeve 1 The forming method with the static pressure sleeve 2 is realized by the method of secondary centrifugal casting of copper by casting.

In order to ensure that the thickness of the oil film is balanced when the transmission shaft is running in the bearing sleeve, there are at least two oil drainage areas 22 .

In order to facilitate the assembling between the bearing sleeve 1 and the bearing housing in the later stage, a plurality of assembling holes 14 connected to the left and right are provided on the annular protrusion at the left end of the bearing sleeve 1 .

As shown in FIG. 4 , in order to realize the axial thrust of the transmission shaft installed in the static pressure sleeve 2 , the right end surface of the static pressure sleeve 2 is provided with an annular static pressure groove 23 concentric with the shaft hole 21 .

In order to facilitate the oil in the drain area 22 to flow into the right end of the static pressure sleeve 2 , an oil guide groove 24 communicated with the right end surface of the static pressure sleeve 2 is provided at the position of the inner wall of the shaft hole 21 corresponding to the oil drain area 22 .

In order to facilitate the penetration and connection of the transmission shaft, the left and right ends of the inner shaft hole 21 of the static pressure sleeve 2 are provided with outwardly expanding guide flares.

When in use, the bearing sleeve 1 is fixed on the bearing housing by bolts through the assembly hole 14, the transmission shaft is inserted into the shaft hole 21 of the static pressure sleeve 2, the transmission shaft and the bearing sleeve 1 are sealed by the sealing ring 12, and the oil Entering into the shaft hole 21 through the oil drain area 22 , an oil film is formed in the gap between the transmission shaft and the shaft hole 21 , and the oil also enters the right end face of the static pressure sleeve 2 through the oil guide groove 24 , and then penetrates into the static pressure groove 23 Inside, the oil film for axial thrust can also be formed on the right end face of the static pressure sleeve 2. Since the forming method between the bearing sleeve 1 and the static pressure sleeve 2 is realized by the method of secondary centrifugal casting of copper by castings, the improvement is improved. The elasticity of the bearing sleeve is improved, and the oil film gap between the transmission shaft and the bearing sleeve will not change when the oil temperature in the bearing sleeve 1 changes, which ensures the running accuracy of the transmission shaft.

The hydrostatic bearing sleeve not only ensures the rigidity of the bearing sleeve, but also maximizes the elasticity of the bearing sleeve. Even if the oil temperature changes, the oil film gap between the shaft and the bearing sleeve will not change, thus making up for The prior art has the shortcomings of easy change of oil film, easy deformation of the bearing and low running precision of the bearing, so that the bearing can reach the precision of 0.2u m, and the rotation speed can reach 10000 rpm.

It should be emphasized that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are Still belong to the scope of the technical solution of the present invention.

Claims (8)

1. A bearing sleeve of a hydrostatic bearing, comprising a bearing sleeve (1) made of an alloy, the center of the end face of the bearing sleeve (1) is provided with a circular sleeve connecting hole (11) communicating with the left and right, and the bearing sleeve (1) ) is provided with an annular protrusion near the left end of the outer periphery, and is characterized in that: the left end of the bearing sleeve (1) is provided with a sealing hole (13) concentric with the socket hole (11), and the right end is socketed with a socket hole (13). (11) The cooperating static pressure sleeve (2), the static pressure sleeve (2) is a copper sleeve, the center of its end face is provided with a left and right connecting shaft hole (21), and the outer periphery of the static pressure sleeve (2) is provided near the right end. There is a limit protrusion with an annular structure, the limit protrusion is clamped on the outer side of the right end of the bearing sleeve (1), and the outer circumference of the limit protrusion is provided with an oil drain area (22) that communicates with the shaft hole (21). . 2 . The bearing sleeve of a hydrostatic bearing according to claim 1 , wherein: there are at least two oil drainage areas ( 22 ). 3 . 3 . The bearing sleeve of a hydrostatic bearing according to claim 1 , wherein the sealing hole ( 13 ) is a countersunk hole, and a sealing ring ( 12 ) which is embedded in the sealing hole ( 13 ) is arranged in the sealing hole ( 13 ). 4 . ). 4 . The bearing sleeve of a hydrostatic bearing according to claim 1 , characterized in that: the annular protrusion at the left end of the bearing sleeve ( 1 ) is provided with a plurality of assembly holes ( 14 ) that communicate with each other. 5 . The bearing sleeve of a hydrostatic bearing according to claim 1 , wherein the left end of the hydrostatic sleeve ( 2 ) sleeved in the bearing sleeve ( 1 ) is in phase with the right end of the sealing hole ( 13 ). 6 . catch. 6 . The hydrostatic bearing sleeve according to claim 1 , characterized in that: an annular hydrostatic groove ( 23 ) concentric with the shaft hole ( 21 ) is provided on the right end surface of the hydrostatic sleeve ( 2 ). 7 . 7. A hydrostatic bearing sleeve according to claim 1, characterized in that: a part of the inner wall of the shaft hole (21) corresponding to the oil drain area (22) is provided with a part that communicates with the right end surface of the hydrostatic sleeve (2). of the oil guide groove (24). 8 . The hydrostatic bearing sleeve according to claim 1 , wherein the left and right ends of the inner shaft hole ( 21 ) of the hydrostatic sleeve ( 2 ) are provided with outwardly expanding guide flares. 9 .

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