CN106763198A

CN106763198A - A kind of tilting thrust bearing of complicated slip surface

Info

Publication number: CN106763198A
Application number: CN201710140101.2A
Authority: CN
Inventors: 刘莹; 宋智翔; 郭飞; 刘向锋; 王玉明
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2017-03-10
Filing date: 2017-03-10
Publication date: 2017-05-31
Anticipated expiration: 2037-03-10
Also published as: CN106763198B

Abstract

The present invention provides a kind of tilting thrust bearing of complicated slip surface, including some tile fragments, and the upper surface of tile fragment is divided into two regions：Near the region I and remaining region II of entrance area, wherein, region I is hydrophobic surface by surface treatment, so that with relatively low limiting shearing stress, interface sliding easily occur；Region II is water-wetted surface by surface treatment, so as to limiting shearing stress higher, be not susceptible to interface sliding；After the Center of Pressure change and inclined to the pendulum characteristic of tile fragment that consideration interfacial effect is brought, optimization obtains the radial direction and circumferentially distributed scope of region I, after lubricant medium is by region I inflow regions II, because the continuity of media flow can produce extra pressure spike, so as to increase the bearing capacity of tilting thrust bearing, because the fluid shearing viscous force in the I of region reduces, so as to reduce the friction torque of tilting thrust bearing, different zones step design solves the not anti abrasive problem of hydrophobic ingredient in the I of region.

Description

A kind of tilting thrust bearing of complicated slip surface

Technical field

The invention belongs to technical field of bearings, more particularly to a kind of tilting thrust bearing of complicated slip surface.

Background technology

Thrust bearing directly determines whole mechanical system as the basis in mechanical system and key components and parts, its performance Life and reliability.With the gradually popularization of water lubrication, large scale water lubriucated bearing has that thickness is small, linear velocity is high Feature, corresponding shear rate is so great that between solid liquid interface, especially in hydrophobic surface, it may occur that interface Sliding.

First it is that Spikes applies interface sliding in thrust slide bearing in research of the forefathers to interface sliding Reduce the friction torque of bearing, the later stage has scholar that interface sliding is applied into concentric radial plain bearing and parallel-plate thrust bearing In, reduce friction torque while bearing capacity is improved.

At present in mandate, disclosed patent, patent《With the thrust bearing of interface sliding technology》(application number： 200810025059.0 notification number CN100545469C) disclose a kind of utilization interface sliding characteristic by the flat board that is parallel to each other The new thrust bearing of composition, has preferable antifriction, antiwear characteristic while realizing certain bearing capacity；Patent《With boundary Face slides the concentric radial plain bearing to be formed》(application number：201510203567.3 notification number CN104791381A) disclose A kind of concentric journal bearing of utilization interface sliding characteristic, bearing has the characteristic of certain bearing capacity and antifriction；However, above The design bearing formed with interface sliding of announcement has only focused on bearing capacity and frictional force have been subtracted with after interface sliding Few, the Center of Pressure for being but not concerned with being brought by interface sliding offsets, so this design can not apply to tilting thrust bearing In, identical design parameter may bring the failure of tilting thrust bearing.

Because prior art has above-mentioned deficiency, there is presently no the complicated interface slip shaft for tilting thrust bearing Hold design.

The content of the invention

In order to overcome the shortcoming of above-mentioned prior art, the tile fragment for tilting thrust bearing can incline pendulum characteristic, the present invention Purpose be that a kind of tilting thrust bearing of complicated slip surface is provided, can improve tilting thrust bearing bearing capacity and Reduce friction.

To achieve these goals, the technical solution adopted by the present invention is：

A kind of tilting thrust bearing of complicated slip surface, including some tile fragments, the upper surface of the tile fragment is divided into Two regions：Near the region I and remaining region II of entrance area, wherein, region I is hydrophobic surface by surface treatment, from And there is relatively low limiting shearing stress, easily there is interface sliding；Region II is water-wetted surface by surface treatment, so as to have Limiting shearing stress higher, is not susceptible to interface sliding.

The height of the region I is less than the height of region II, and difference in height determines according to the duty parameter of bearing actual motion, Minimum thickness of liquid film operating to thrust bearing is for same magnitude and is directly proportional, will not with the hydrophobic surface in the I of protection zone Worn and torn caused by starting with docking process.

Change in view of interface sliding to Center of Pressure, the circumferential scope of the region I is no more than whole tile fragment cornerite 75%, otherwise because the tile fragment pendulum that can incline can cause the failure of bearing.

Compared with prior art, the beneficial effects of the invention are as follows：

(1) complicated slip surface design is carried out using interface sliding effect in tilting thrust bearing, can be simultaneously real The high bearing capacity and low friction moment of existing tilting thrust bearing.

(2) change of the interface sliding effect to Center of Pressure is considered in the design, so as to avoid design can Incline and fail in watt thrust bearing.

(3) abrasion in shutdown process to hydrophobic surface is avoided using the step design of part tile fragment so that bearing is excellent Change effect more lasting.

Brief description of the drawings

Fig. 1 is thrust bearing pad interface sliding surface design diagram of the present invention.

Fig. 2 is thrust bearing pad apparent height design diagram of the present invention.

Fig. 3 is the pressure distribution schematic diagram before the embodiment of the present invention 1 optimizes.

Fig. 4 is the pressure distribution schematic diagram after the optimization of the interface sliding of the embodiment of the present invention 1.

Specific embodiment

Describe embodiments of the present invention in detail with reference to the accompanying drawings and examples.

Embodiment 1

Optimize the external diameter of thrust bearing in the present embodiment for 800mm, internal diameter is 400mm, cornerite is 40 °, is radially propped up partially Coefficient is 0.524, and circumferential branch coefficient partially is 0.609, and normal work rotating speed is 1500rpm, and average operation pressure is 0.544MPa.

As shown in figure 1, the upper surface of tile fragment is divided into two regions：Near the region I and remaining region II of entrance area, Wherein, region I is hydrophobic surface by surface treatment, so that with relatively low limiting shearing stress, interface sliding easily occur；Area Domain II is water-wetted surface by surface treatment, so as to limiting shearing stress higher, be not susceptible to interface sliding.

As shown in Fig. 2 height of the height of region I less than region II, the height of region I is than region II's in the present embodiment It is highly low 40 μm, will not be worn and torn caused by starting with docking process with the hydrophobic surface in the I of protection zone.

Limiting shearing stress is 0.4Pa after region I surface treatments in the present embodiment, and slip length is 100 μm, region II tables Limiting shearing stress is 1MPa after the treatment of face, and slip length is 0.

In the present embodiment region I along tile fragment circumference accounting 75%, along tile fragment radial direction accounting 60%.

Using the film pressure distribution before interface sliding effect as shown in figure 3, using interface sliding effect in the present embodiment Pressure distribution afterwards is as shown in Figure 4.Figure 4, it is seen that region I and region II boundary liquid film generate one compared with Big pressure spike, so as to improve the bearing capacity of bearing；Because the fluid viscous force in the I of region is greatly reduced, so as to drop The low bearing capacity of bearing.The minimum thickness of bearing can improve 50%, and moment of friction can reduce 60%.

Embodiment 2

Optimize the external diameter of thrust bearing in the present embodiment for 800mm, internal diameter is 400mm, cornerite is 40 °, is radially propped up partially Coefficient is 0.524, and circumferential branch coefficient partially is 0.5, and tile fragment preprocessing has 25 μm of arc convex, and normal work rotating speed is 1500rpm, average operation pressure is 0.544MPa.

In the present embodiment region I along tile fragment circumference accounting 60%, along tile fragment radial direction accounting 60%.

45% can be improved using the minimum thickness of the bearing after interface sliding effect, moment of friction can be with the present embodiment Reduce 52%.

These are only the preferred embodiments of the present invention, be not intended to limit the invention, the present invention can have it is various change and Change.All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., should be included in this hair Within bright protection domain.

Operation principle of the invention：

In the course of work, fluid enters from tile fragment entrance side, outlet side outflow, when by region I, due to tile fragment surface Neighbouring shear stress is more than surface limit shear stress, so solid-liquid surface there occurs interface sliding so that the stream near tile fragment Body speed is more than theoretical without sliding numerical value.And when by region II, because tile fragment surface limit shear stress is more than fluid , there is no interface sliding in shear stress so that the fluid velocity near tile fragment tends to 0 between solid-liquid surface.In region, I flows to area During the II of domain, fluid velocity there occurs reduction suddenly, in order to ensure the continuity of fluid flow in flowing, one can be produced in boundary Individual pressure spike (as shown in Figure 3 and Figure 4) so that bearing capacity increases, simultaneously because the fluid viscous force in the I of region reduces, So that the moment of friction of bearing reduces.At the same time, region I's is highly relatively low, this guarantees region I in it is hydrophobic into Dividing will not be worn in the start and stop stage.

Claims

1. a kind of tilting thrust bearing of complicated slip surface, including some tile fragments, it is characterised in that the upper table of the tile fragment Face is divided into two regions：Near the region I and remaining region II of entrance area, wherein, region I is hydrophobic by surface treatment Surface, so that with relatively low limiting shearing stress, interface sliding easily occur；Region II is water-wetted surface by surface treatment, So as to have limiting shearing stress higher, interface sliding is not susceptible to.

2. the tilting thrust bearing of complicated slip surface according to claim 1, it is characterised in that the height of the region I Height of the degree less than region II, will not be worn and torn with the hydrophobic surface in the I of protection zone caused by starting with docking process.

3. the tilting thrust bearing of complicated slip surface according to claim 2, it is characterised in that the region I and area The difference in height of domain II determines according to the duty parameter of bearing actual motion, is same with the operating liquid film minimum thickness of thrust bearing One magnitude.

4. the tilting thrust bearing of complicated slip surface according to claim 1, it is characterised in that the week of the region I To scope no more than the 75% of whole tile fragment cornerite.

5. the tilting thrust bearing of complicated slip surface according to claim 4, it is characterised in that in eccentric support bearing And under specific operation, region I circumference accountings 75%, along tile fragment radial direction accounting 60%；Under centre bearing bearing and specific operation, Region I circumference accountings 60%, along tile fragment radial direction accounting 60%.