CN111594548B - A kind of static pressure bearing bearing sleeve - Google Patents

Abstract

The invention discloses a hydrostatic bearing sleeve which is provided with a bearing sleeve, wherein a sleeve joint hole is formed in the center of the end face of the bearing sleeve, an annular bulge is formed in the part, close to the left end, of the periphery of the bearing sleeve, a sealing hole is formed in the left end of the bearing sleeve, the right end of the bearing sleeve is sleeved with the hydrostatic sleeve, a shaft hole communicated left and right is formed in the center of the end face of the hydrostatic sleeve, a limiting bulge of an annular structure is formed in the part, close to the right end, of the periphery of the hydrostatic sleeve, the limiting bulge is clamped on the outer side of the right end of the bearing sleeve, and an oil drain area communicated with the shaft hole is formed in the periphery of the limiting bulge. The hydrostatic bearing sleeve not only ensures the rigidity of the bearing sleeve, but also improves the elasticity of the bearing sleeve to the greatest extent, and even if the oil temperature changes, the oil film gap between the shaft and the bearing sleeve cannot change, thereby overcoming the defects of easy change of an oil film, easy deformation of the bearing and low running precision of the bearing in the prior art, enabling the bearing to reach the precision of 0.2u meter and the rotating speed to reach 10000 revolutions per minute.

Description

A kind of static pressure bearing bearing sleeve

Technical field

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

Background technique

Hydrostatic bearings are a type of sliding bearing that use 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 operate at low speeds but require high load-bearing capacity, high rotation accuracy, and high speeds, such as various heavy-duty machine tools and high-precision machine tools.

At present, most hydrostatic bearing sleeves on the market are made of steel or cast iron. This structure has strong rigidity, but very little elasticity. It is subject to large changes in oil temperature, and its accuracy is easily deformed due to temperature changes, resulting in the transmission shaft being in the bearing. The thickness of the oil film is prone to change during operation in the sleeve, which prevents the operating accuracy of the hydrostatic bearing from being improved. This makes the accuracy of the hydrostatic bearing lag behind internationally. The high-precision hydrostatic bearings China needs are completely dependent on imports.

Contents of the invention

The technical problem to be solved by the present invention is to provide a hydrostatic bearing sleeve with high elasticity and precision that is not easily deformed by temperature changes to ensure the accuracy of bearing operation.

In order to solve the above technical problems, the present invention is realized through the following technical solutions: a hydrostatic 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 circular sleeve hole connected to the left and right , an annular protrusion is provided on the outer circumference of the bearing sleeve near the left end. The left end of the bearing sleeve is provided with a sealing hole concentric with the sleeve hole. The right end is sleeved with a static pressure sleeve that matches the sleeve hole. The static pressure sleeve It is a copper sleeve, and the center of its end face is provided with a shaft hole that connects the left and right sides. The outer periphery of the static pressure sleeve is provided with a limit protrusion of an annular structure near the right end. The limit protrusion is engaged with the outside of the right end of the bearing sleeve. The limit protrusion is An oil drain area connected to the shaft hole is provided on the outer periphery of the position protrusion.

Preferably, there are at least two oil drainage areas.

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

Preferably, the annular protrusion at the left end of the bearing sleeve is provided with a number of mounting holes connected to the left and right.

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

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

Preferably, the inner wall of the shaft hole is provided with an oil guide groove communicating with the right end surface of the static pressure sleeve at a position 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 benefit of the present invention is that 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 shaft and bearing The oil film gap between the sleeves will not change, thus making up for the shortcomings of the existing technology 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 achieve an accuracy of 0.2u meters, and the rotation speed can reach 10,000 rpm. /minute.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Figure 1 is a sectional view of the internal structure of a hydrostatic bearing sleeve according to the present invention;

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

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

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

In the picture: 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:

Figure 1 shows a hydrostatic bearing sleeve, which has a bearing sleeve 1 made of alloy. As shown in Figure 2, the center of the end face of the bearing sleeve 1 is provided with a circular socket hole 11 connected to the left and right. The bearing sleeve 1 is provided with an annular protrusion near the left end of the outer periphery. The left end of the bearing sleeve 1 is provided with a sealing hole 13 concentric with the sleeve hole 11. The sealing hole 13 is a countersunk hole, and the sealing hole 13 is provided with a sealing hole 13 embedded therein. The sealing ring 12 that matches the sealing ring ensures the sealing performance in the bearing sleeve 1; the right end of the bearing sleeve 1 is sleeved with a static pressure sleeve 2 that matches the sleeve hole 11, and the static pressure sleeve 2 is sleeved 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 a left and right connected shaft hole 21 is provided in the center of its end face. The outer periphery of the static pressure sleeve 2 is located near the right end. There is a limit protrusion with an annular structure. The limit protrusion is clamped on the outside of the right end of the bearing sleeve 1. The outer periphery of the limit protrusion is provided with an oil drain area 22 connected with the shaft hole 21; the bearing sleeve 1 The molding method between the static pressure sleeve 2 and the static pressure sleeve 2 is achieved by secondary centrifugal pouring of copper from the casting.

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

In order to facilitate the later assembly between the bearing sleeve 1 and the bearing box, the annular protrusion at the left end of the bearing sleeve 1 is provided with a number of assembly holes 14 connected to the left and right.

As shown in FIG. 4 , in order to achieve 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 oil drain area 22 to flow into the right end of the static pressure sleeve 2 , an oil guide groove 24 is provided on the inner wall of the shaft hole 21 corresponding to the oil drain area 22 and communicates with the right end surface of the static pressure sleeve 2 .

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 box by bolts passing through the assembly holes 14, and the transmission shaft passes through the shaft hole 21 of the static pressure sleeve 2. The transmission shaft and the bearing sleeve 1 are sealed by a sealing ring 12, and the oil The oil enters the shaft hole 21 through the oil drain area 22, causing an oil film to form in the gap between the transmission shaft and the shaft hole 21. At the same time, the oil also enters the right end surface of the static pressure sleeve 2 through the oil guide groove 24, and then penetrates into the static pressure groove 23. , so that the right end surface of the static pressure sleeve 2 can also form an oil film for axial thrust. Since the molding method between the bearing sleeve 1 and the static pressure sleeve 2 is realized by secondary centrifugal pouring of copper from the casting, it 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, thus ensuring the operation accuracy of the transmission shaft.

This kind of 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 The existing technology has the disadvantages 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 achieve an accuracy of 0.2u meters and the rotation speed can reach 10,000 rpm.

It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are It still falls within the scope of the technical solution of the present invention.

Claims (1)

1. A hydrostatic bearing sleeve, which has a bearing sleeve (1) made of alloy. The end face center of the bearing sleeve (1) is provided with a circular socket hole (11) connected to the left and right. The bearing sleeve (1) ) The outer periphery is provided with an annular protrusion near the left end, which is characterized in that: the left end of the bearing sleeve (1) is provided with a sealing hole (13) concentric with the sleeve hole (11), and the right end is sleeved with the sleeve hole (11). (11) Matching 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 connected shaft hole (21). 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 outside of the right end of the bearing sleeve (1). The outer periphery of the limit protrusion is provided with an oil drain area (22) connected to the shaft hole (21). ; The oil drain area (22) has at least two; the sealing hole (13) is a countersunk hole, and a sealing ring (12) embedded in the sealing hole (13) is provided; the bearing sleeve (13) 1) The annular protrusion at the left end is provided with a number of assembly holes (14) connected to the left and right; the left end of the static pressure sleeve (2) sleeved in the bearing sleeve (1) is connected to the right end of the sealing hole (13); The right end face of the static pressure sleeve (2) is provided with an annular static pressure groove (23) concentric with the shaft hole (21); the inner wall of the shaft hole (21) is provided with an annular static pressure groove (23) corresponding to the oil drain area (22). The right end surface of the pressure sleeve (2) communicates with the oil guide groove (24); the left and right ends of the inner shaft hole (21) of the static pressure sleeve (2) are provided with outwardly expanding guide flares.