CN107387548B - Archimedes Spiral Surface Dynamic Pressure Sliding Bearing and Its Application - Google Patents

Abstract

The invention discloses an archimedes spiral surface dynamic pressure sliding bearing and application thereof, comprising a bearing body, wherein at least one archimedes spiral surface is arranged along the circumferential direction of the inner wall of the bearing body and used for forming a bearing lubricating oil cavity, an oil inlet is arranged at the maximum cutting depth of the top of the archimedes spiral surface, and an oil outlet is arranged at the maximum cutting depth of the bottom of the archimedes spiral surface, which is close to the end face of the bearing. The invention refers to the existing sliding bearing structure and combines with the practical application background, and provides a brand new oil cavity structure, namely an oil cavity formed by Archimedes spiral surfaces, which can effectively accelerate the circulation of lubricating oil, reduce the heating of the bearing and the temperature rise of the bearing, and the bearing has large effective bearing area and is suitable for high-speed heavy-load occasions.

Description

Archimedes Spiral Surface Dynamic Pressure Sliding Bearing and Its Application

technical field

The invention relates to the field of rotating machinery, such as a high-speed machine tool spindle system, a high-speed rotor system, etc., and particularly relates to an Archimedes helical surface dynamic pressure sliding bearing and its application.

Background technique

Sliding bearings have the advantages of stable operation and good vibration resistance, and are widely used in rotating machinery. However, with the continuous increase in the speed of rotating machinery, the temperature rise of sliding bearings has become the main obstacle restricting its application. Therefore, in many occasions, there is a tendency to be replaced by rolling bearings. However, in some important occasions, such as the spindle of a powerful cutting machine tool, the rotor of a water turbine, the connecting rod of an internal combustion engine, etc., sliding bearings still have irreplaceable advantages. How to reduce the heating and temperature rise of sliding bearings has become a key issue for sliding bearings to play an important role.

Patent CN200810166519.1 discloses a sliding bearing in which a resin layer is provided on the inner cavity wall of the bearing to prevent local high temperature. Patent CN200710162615.4 provides a cylindrical sliding bearing with upper and lower split bearings to support the crankshaft of the internal combustion engine; Chinese patent 2005200454091 discloses a stepped hydrostatic bearing, which is characterized in that the oil chamber is inclined, and the oil inlet groove is parallel to the axial boundary of the oil chamber. This kind of bearing needs to work with a throttle. Chinese patent CN95192327.7 discloses a sliding bearing with an annular intermediate support, which has a complex structure. There are also some patents for sliding bearings, which provide new designs according to different application requirements. However, they generally have the disadvantages of relatively complex structure or process, the circulation of lubricating oil cannot be optimal, and there are still some defects in reducing the bearing temperature, and they still cannot meet the requirements for high-speed and high-vibration environments.

Contents of the invention

The purpose of the present invention is to solve the problem of heating and temperature rise of sliding bearings, and provide a new type of high-speed dynamic pressure sliding bearing that can effectively speed up the circulation of lubricating oil, reduce the heating of bearings, and reduce the temperature rise of bearings, and the bearing has a large effective bearing area and is suitable for high-speed and heavy-load applications.

To achieve the above object, the present invention adopts the following technical solutions:

An Archimedes helicoid dynamic pressure sliding bearing is characterized in that it includes a bearing body, at least one Archimedes helicoid formed by depressions is arranged along the circumferential direction of the inner wall of the bearing to form a lubricating oil chamber for the bearing, an oil inlet is provided at the maximum depth of cut at the top of each Archimedes helix, and an oil outlet is provided at the maximum depth of cut near the end surface of the bearing at the bottom of the Archimedes helix.

Further, when there are multiple Archimedes helicoids, the multiple Archimedes helicoids are uniformly arranged on the inner wall of the bearing along the circumferential direction of the bearing body.

Further, the oil inlets of the multiple Archimedes helicoids are located on the same ring.

Further, the oil outlets of the multiple Archimedes helicoids are located on the same ring.

Further, the new high-speed dynamic pressure sliding bearing is applied to the spindle system of high-speed machine tools.

Furthermore, the new high-speed dynamic pressure sliding bearing is applied to the high-speed rotor system.

The specific working process of the bearing is as follows:

When the bearing is in operation, the lubricating oil entering the bearing body from the oil inlet is driven by the rotating shaft, flows along the circumferential direction while flowing along the Archimedes helical surface to the other end of the bearing; an oil film pressure is formed on the converging Archimedes helical surface to realize load bearing; the existence of the Archimedes helical surface accelerates the axial flow of the lubricating oil and accelerates the circulation of the lubricating oil, which is one of the reasons for reducing the temperature rise of the bearing. Due to the setting of the oil outlet, a pressure band is formed from the oil inlet to the oil outlet. When the hot oil from the previous oil wedge enters the Archimedes spiral surface, the oil film gap suddenly increases and the pressure drops rapidly. This bearing has very good high-speed characteristics. The Archimedes spiral surface processed by this kind of bearing is convergent in the direction of rotation of the circumference, and there is no divergent part, so the bearing area is large.

The beneficial effects of the present invention are:

The present invention refers to the existing sliding bearing structure and combines it with the actual application background to invent a brand-new oil cavity structure—the oil cavity formed by the Archimedes spiral surface, which can effectively accelerate the circulation of lubricating oil, reduce the heat generation of the bearing, and reduce the temperature rise of the bearing. Moreover, the bearing has a large effective bearing area and is suitable for high-speed and heavy-load applications.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute an improper limitation of the present application.

Fig. 1, Fig. 2 are structural representations of the present invention;

Fig. 3 is a working principle diagram of the present invention;

Wherein, 1. bearing body, 2. Archimedes spiral surface, 3. oil outlet, 4. oil inlet.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. In addition, it should also be understood that when the terms "comprising" and/or "comprises" are used in this specification, it indicates the presence of features, steps, operations, means, components and/or their combination.

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

In Fig. 1, the new high-speed dynamic pressure sliding bearing includes a bearing body 1, at least one Archimedes helicoid 2 is provided on the inner surface of the bearing body 1, an oil inlet 4 is provided at the top of each Archimedes helix 2 at the maximum depth of cut, and an oil outlet 3 is provided at the bottom of the Archimedes helix 2 near the maximum depth of cut of the bearing end face.

In the present invention, a plurality of Archimedes spiral surfaces are processed on the inner surface of the bearing, and the plurality of Archimedes spiral surfaces are evenly arranged on the inner wall of the bearing body along the circumferential direction of the bearing body. An oil inlet 4 is provided at the maximum depth of cut at the top of each helicoid, and an oil outlet 3 is provided at the maximum depth of cut near the end surface of the bearing at the bottom; the oil inlets of multiple Archimedes helicoids are located on the same ring; the oil outlets of multiple Archimedes helicoids are located on the same ring.

When the bearing is in operation, the lubricating oil entering the bearing body from the oil inlet 4 is driven by the rotating shaft, flows along the circumferential direction, and at the same time flows along the Archimedes spiral surface to the other end of the bearing, as shown in Figure 3 below; Figure 3 is a distribution diagram of the Archimedes spiral surface inside the bearing body and a schematic diagram of the working principle after assuming that the bearing body is unfolded into a rectangular body;

Oil film pressure is formed on the convergent Archimedes helicoid to realize load bearing. The existence of the Archimedes spiral surface accelerates the axial flow of lubricating oil and accelerates the circulation of lubricating oil, which is one of the reasons for reducing the temperature rise of the bearing. Due to the setting of the oil outlet 3, a pressure band is formed from the oil inlet 4 to the oil outlet 3. When the hot oil from the previous oil wedge enters the Archimedes spiral surface, the oil film gap suddenly increases and the pressure drops rapidly. This bearing has very good high-speed characteristics. The Archimedes spiral surface processed by this kind of bearing is convergent in the direction of rotation of the circumference, and there is no divergent part, so the bearing area is large.

The key to the manufacture of this kind of bearing is the processing of the Archimedes spiral surface in the inner cavity, which can be completed on the machining center. The production of other parts is the same as that of ordinary sliding bearings.

In addition, the present invention also protects the application of the novel high-speed dynamic pressure sliding bearing on the high-speed machine tool spindle system.

The invention also protects the application of the novel high-speed dynamic pressure sliding bearing on a high-speed rotor system.

The novel high-speed dynamic pressure sliding bearing disclosed by the invention is also applied to high-vibration-resistant rotating machines.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or deformations that those skilled in the art can make without creative labor are still within the protection scope of the present invention.

Claims (3)

1. The Archimedes helical surface dynamic pressure sliding bearing is characterized in that, including the bearing body, an Archimedes helicoid formed by at least one depression is provided along the circumferential direction of the inner wall of the bearing to form a bearing lubricating oil chamber, an oil inlet is provided at the top of the Archimedes helix at the maximum depth of cut, and an oil outlet is provided at the bottom of the Archimedes helix near the maximum depth of cut of the bearing end face; When multiple Archimedes helicoids are provided, the multiple Archimedes helicoids are evenly arranged on the inner wall of the bearing body along the circumferential direction of the bearing body; The oil inlets of the plurality of Archimedes helicoids are located on the same ring; The oil outlets of the multiple Archimedes helicoids are located on the same ring; When the bearing is working, the lubricating oil entering the bearing body from the oil inlet is driven by the rotating shaft, flows along the circumferential direction, and at the same time flows along the Archimedes spiral surface to the other end of the bearing; an oil film pressure is formed on the convergent Archimedes spiral surface; Due to the setting of the oil outlet, a pressure zone is formed from the oil inlet to the oil outlet. When the hot oil from the last oil wedge enters the Archimedes spiral surface, the oil film gap suddenly increases and the pressure drops rapidly. 2. The Archimedes helicoidal hydrodynamic sliding bearing as claimed in claim 1 is applied to the spindle system of a high-speed machine tool. 3. The Archimedes spiral surface dynamic pressure sliding bearing as claimed in claim 1 is applied to a high-speed rotor system.