Line-surface combined contact type wind power variable pitch slewing bearing

Abstract

The present application relates to line surface combined contact type wind power variable pitch slewing bearing, comprising: double half outer ring, inner ring, double row axial combined rolling unit and radial roller; The upper and lower cooperation of the double half outer ring forms a whole outer ring and is matched with the inner ring to form a bearing sleeve; The outer diameter center area of the inner ring is provided with a protruding structure extending to the inner diameter of the outer ring, the double half outer ring includes upper half outer ring and lower half outer ring, and the outer diameter protruding outer surface of the inner ring is provided with a groove structure; The upper and lower end faces of the protrusion form a space for bearing double row axial rolling unit between the inner diameter of the retaining edge of the double half outer ring, and the space for bearing radial roller is formed between the protruding groove and the corresponding inner diameter of the outer ring; The axial combined rolling unit comprises: 4 independent bodies and a plurality of cylindrical rollers; It has strong axial bearing capacity, and has strong advantages in axial adaptive inclination and anti-overturning capacity; Reduce the risk of traditional three-row cylindrical slewing bearing contact fatigue.

Description

TECHNICAL FIELD

[0001] The application relates to a three-row cylindrical rotary bearing, in particular to a line-surface combined contact type wind power variable pitch rotary bearing, and belongs to the field of wind power bearing design. BACKGROUND

[0002] The three-row cylindrical bearing with higher bearing capacity is increasingly used in the variable pitch bearing of a large megawatt wind turbine, and has the advantages of compact structure, long service life and high reliability, and can reduce the design and manufacturing cost of the whole wind turbine. However, the three-row cylindrical rotary bearing of the wind turbine is a large thin-walled part, and is prone to roller tilting and edge stress concentration after bearing the axial force, radial force and large overturning moment caused by the interaction of wind and blades and the gravity of the hub.

[0003] The traditional three-row cylindrical rotary bearing transmits load through line contact between rolling elements and raceways of inner and outer rings. According to the analysis of the failure of the known wind power variable pitch three-row cylindrical bearing, the bearing is prone to fracture at the oil groove of the upper and lower directions of the bearing outer ring and edge stress concentration failure. SUMMARY

[0004] The line-surface combined contact type wind power variable pitch rotary bearing is provided according to the stress characteristics of the wind power variable pitch bearing, and compared with the traditional three-row cylindrical bearing, the smaller volume can bear larger load and resist edge stress concentration caused by roller tilting.

[0005] In order to achieve the above purpose, the technical scheme adopted by the application is as follows: the line-surface combined contact type wind power variable pitch rotary bearing comprises: a double-half outer ring, an inner ring, a double-row axial combined rolling unit and a radial roller which are arranged between the double-half outer ring and the inner ring; the double-half outer ring is matched to form an integral outer ring in the up-down direction and is matched with the inner ring to form a bearing ring; a convex structure extending to the inner diameter of the outer ring is arranged in the central region of the outer diameter of the inner ring, the double-half outer ring comprises an upper half outer ring and a lower half outer ring, the outer ends of the upper half outer ring and the lower half outer ring are respectively provided with a stop edge, and a groove structure is formed on the outer surface of the convex structure of the inner ring; the upper and lower end faces of the convex structure form a space for bearing the double-row axial rolling unit between the inner diameters of the stop edges of the double-half outer ring, and the grooves of the convex structure and the inner diameters of the outer ring corresponding to the grooves form a space for bearing the radial roller; the axial combined rolling unit comprises: four independent bodies and a plurality of cylindrical rollers; the four independent bodies are spaced apart and distributed along the circumference of the bearing ring in units of two;

[0006] Further, the bearing divides the ring into first quadrant, second quadrant, third quadrant and fourth quadrant in the axial windward direction; the pitch bearing has low rotation speed but large load, and mainly swings in the range of 0~90°; wherein, the second quadrant and the fourth quadrant in the windward direction are the main force areas, and are the main load bearing areas of the pitch bearing, which are under high load for a long time; the first quadrant and the third quadrant are the auxiliary load bearing areas;

[0007] Further, the upper and lower end faces of the inner ring protrusion are respectively provided with an upper inner ring raceway and a lower inner ring raceway, and the inner diameters of the two retaining edges of the outer ring are respectively provided with an upper outer ring raceway and a lower outer ring raceway; the double-row axial combined rolling units are respectively arranged between the upper inner ring raceway and the lower outer ring raceway and between the lower inner ring raceway and the upper outer ring raceway.

[0008] Further, the 4 segments are divided into two units, and each unit is respectively distributed in the second quadrant and the fourth quadrant, and the cylindrical rollers are distributed in the first quadrant and the third quadrant.

[0009] Further, the two segments of one unit are respectively distributed between the upper inner ring raceway and the lower outer ring raceway in the second quadrant, i.e. between the upper raceway, the lower inner ring raceway and the upper outer ring raceway in the second quadrant, i.e. the lower raceway in the second quadrant; the two segments of the other unit are respectively distributed between the upper inner ring raceway and the lower outer ring raceway in the fourth quadrant, i.e. between the upper raceway, the lower inner ring raceway and the upper outer ring raceway in the fourth quadrant, i.e. the lower raceway in the fourth quadrant.

[0010] Further, each segment is a circular ring body with a square cross section.

[0011] Further, the independent body is in surface contact with the upper and lower raceways of the inner ring and the upper and lower raceways of the outer ring, thereby improving the axial bearing capacity of the bearing.

[0012] Further, the cylindrical rollers distributed in the first quadrant and the third quadrant are in line contact with the upper and lower raceways of the inner ring and the upper and lower raceways of the outer ring; the above two forms constitute the line-surface combined contact of the bearing.

[0013] Further, the contact surface between the independent body and the upper and lower raceways is processed into a circular arc shape, so that the rollers can tilt with the raceways during the operation of the bearing, and the self-adaptive ability of the rolling elements at this position is improved, the edge stress is reduced, and the service life is improved; the original three-row cylindrical bearing is avoided to cause the inclination of the rollers when bearing the axial force and the overturning moment, and then causes the edge stress concentration.

[0014] Further, a positioning boss is further machined on the inner diameter of the outer ring and the outer diameter of the inner ring at the positions of the two ends of the double-row axial rolling unit, which plays a good role in limiting the position shift of the axial rolling unit.

[0015] Further, the positioning boss on the outer ring and the inner ring is 4, two are arranged in each row and are oppositely arranged.

[0016] Further, the inner diameter position of the outer ring corresponding to the radial roller is also processed with a positioning boss, and the upper and lower end faces of the radial roller are respectively provided with gaps from the two side inner walls of the inner ring protruding groove.

[0017] The beneficial effects of the present application are:

[0018] The present application is a brand new bearing structure form, according to the force characteristics of wind power variable pitch bearing, a line-surface combined structure is proposed, which not only has strong axial bearing capacity, but also has strong advantages in axial self-adaptive inclination and anti-overturning capacity; reduce the risk of traditional three-row cylindrical rotary bearing contact fatigue. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a line-surface combined contact type wind power variable pitch rotary bearing assembly drawing of the present application.

[0020] Figure 2 It is a bearing sectional view.

[0021] In the figure, 1, inner ring, 2, radial roller, 3, protrusion, 4, upper half outer ring, 5, lower half outer ring, 6, retaining edge, 7, first quadrant, 8, second quadrant, 9, third quadrant, 10, fourth quadrant, 1.1, inner ring upper raceway, 1.2, inner ring lower raceway, 4.1, outer ring upper raceway, 5.1, outer ring lower raceway, 11, positioning boss, 12, independent body, 13, cylindrical roller. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0023] The line-surface combined contact type wind power variable pitch rotary bearing comprises a double half outer ring, an inner ring 1, a double-row axial combined rolling unit and a radial roller 2 which are arranged between the double half outer ring and the inner ring 1, the double half outer ring is matched to form an integral outer ring and cooperates with the inner ring 1 to form a bearing ring, the inner ring 1 is provided with a protrusion 3 structure extending to the inner diameter of the outer ring in the central region of the outer diameter, the double half outer ring comprises an upper half outer ring 4 and a lower half outer ring 5, the outer ends of the upper half outer ring 4 and the lower half outer ring 5 are respectively provided with a stop edge 6, the outer surface of the protrusion 3 of the inner ring 1 is provided with a groove structure, the upper and lower end faces of the protrusion 3 and the inner diameters of the stop edges 6 of the double half outer ring form a space for bearing the double-row axial rolling unit, and the grooves of the protrusion 3 and the inner diameters of the outer ring form a space for bearing the radial roller, the axial combined rolling unit comprises four independent bodies 12 and a plurality of cylindrical rollers 13, and the four independent bodies 12 are spaced apart along the circumference of the bearing ring in units of two;

[0024] Further, the bearing divides the ring into a first quadrant 7, a second quadrant 8, a third quadrant 9 and a fourth quadrant 10 in the axial windward direction, the variable pitch bearing has low speed and large load, and mainly swings in the range of 0-90°, wherein the second quadrant 8 and the fourth quadrant 10 in the windward direction are main force areas and are main bearing areas of the variable pitch bearing, and the areas are long-term high-load areas, and the first quadrant 7 and the third quadrant 9 are auxiliary bearing areas;

[0025] Further, the upper and lower end faces of the protrusion of the inner ring 1 are respectively provided with an inner ring upper raceway 1.1 and an inner ring lower raceway 1.2, and the inner diameters of the two stop edges of the outer ring are respectively provided with an outer ring upper raceway 4.1 and an outer ring lower raceway 5.1, the double-row axial combined rolling unit is arranged between the inner ring upper raceway 1.1 and the outer ring lower raceway 5.1 and between the inner ring lower raceway 1.2 and the outer ring upper raceway 4.1;

[0026] Further, the four independent bodies 12 are units of two, and each unit is distributed in the second quadrant 8 and the fourth quadrant 10, and the cylindrical rollers 13 are distributed in the first quadrant 7 and the third quadrant 9;

[0027] Further, the two independent bodies 12 of one unit are respectively distributed between the inner ring upper raceway 1.1 and the outer ring lower raceway 5.1 of the second quadrant 8, between the inner ring lower raceway 1.2 and the outer ring upper raceway 4.1 of the second quadrant 8, and between the inner ring upper raceway 1.1 and the outer ring lower raceway 5.1 of the fourth quadrant 10, and between the inner ring lower raceway 1.2 and the outer ring upper raceway 4.1 of the fourth quadrant 10;

[0028] Further, each independent body 12 is a circular ring body with a square cross section.

[0029] Further, the independent body 12 is in surface contact with the upper and lower raceways of the inner ring and the upper and lower raceways of the outer ring, thereby improving the axial load capacity of the bearing.

[0030] Further, the several cylindrical rollers 13 distributed in the first quadrant 7 and the third quadrant 9 are in line contact with the upper and lower raceways of the inner ring and the upper and lower raceways of the outer ring; the two forms constitute the line-surface combined contact of the bearing.

[0031] Further, the contact surface between the independent body 12 and the upper and lower raceways is processed into a logarithmic circular arc shape, so that the roller can tilt with the raceway during the operation of the bearing, thereby improving the self-adaptive ability of the roller, reducing the edge stress, and improving the service life; the original three-row cylindrical bearing is prevented from being tilted and causing edge stress concentration when bearing axial force and overturning moment.

[0032] Further, a positioning boss 11 is further machined on the outer diameter of the outer ring and the outer diameter of the inner ring 1 at the positions of the two ends of the double-row axial rolling unit, thereby playing a good role in limiting the position shift of the axial rolling unit.

[0033] Further, the positioning boss 11 on the outer ring and the inner ring 1 is four, two are arranged in each row and are oppositely arranged.

[0034] As other embodiments of the present application, the bearing can be set as a three-row cylindrical slewing bearing of a wind turbine in the form of a double-half inner ring.

[0035] The present design can improve the axial load capacity of the bearing and the self-adaptive ability of the roller tilt in a limited space, and reduce the risk of oil groove fracture of the traditional three-row cylindrical slewing bearing.

Claims

1. A line-surface combined contact type wind turbine pitch slewing bearing, characterized in that, include: The bearing comprises a double-half outer ring, an inner ring, a double-row axially combined rolling unit and radial rollers arranged between the double-half outer ring and the inner ring; the double-half outer ring is fitted together to form an integral outer ring and cooperates with the inner ring to form a bearing race; the inner ring has a raised structure extending towards the inner diameter of the outer ring in the central area of ​​its outer diameter; the double-half outer ring includes an upper half outer ring and a lower half outer ring, with flanges at their outer ends; the outer surface of the raised part of the inner ring has a groove structure; the upper and lower end faces of the raised part and the inner diameter of the flange of the double-half outer ring respectively form a space to support the double-row axially rolling unit; the groove of the raised part and the inner diameter of the outer ring corresponding to the groove form a space to support the radial rollers; the axially combined rolling unit includes: 4 independent segments and several cylindrical rollers; the 4 independent segments are arranged in units of 2 segments and several cylindrical rollers are spaced apart along the circumference of the bearing race; The bearing rings are divided into four quadrants: the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant according to the axial direction facing the wind. The four independent segments are divided into units of two segments each, with each unit distributed in the second and fourth quadrants, and the cylindrical rollers distributed in the first and third quadrants. Each independent segment is a toroidal body with a square cross-section; The contact between the independent body and the upper and lower raceways of the inner ring and the upper and lower raceways of the outer ring is a surface contact. The cylindrical rollers distributed in the first and third quadrants make line contact with the upper and lower raceways of the inner ring and the upper and lower raceways of the outer ring.

2. The line-surface combined contact type wind turbine pitch slewing bearing according to claim 1, characterized in that: The upper and lower end faces of the inner ring protrusion are respectively provided with an upper inner ring raceway and an lower inner ring raceway, and the inner diameters of the two flanges of the outer ring are respectively provided with an upper outer ring raceway and an lower outer ring raceway; the double-row axial combined rolling units are respectively arranged between the upper inner ring raceway and the lower outer ring raceway, and between the lower inner ring raceway and the upper outer ring raceway.

3. The line-surface combined contact type wind turbine pitch slewing bearing according to claim 1, characterized in that: One unit has two independent sections distributed between the inner raceway and the outer raceway in the second quadrant, i.e., between the upper raceway and the lower raceway of the inner raceway and the upper raceway of the outer raceway in the second quadrant, i.e., between the lower raceway of the second quadrant; the other unit has two independent sections distributed between the inner raceway and the outer raceway in the fourth quadrant, i.e., between the upper raceway and the lower raceway of the inner raceway and the upper raceway of the outer raceway in the fourth quadrant, i.e., between the lower raceway of the fourth quadrant.

4. The line-surface combined contact type wind turbine pitch slewing bearing according to claim 3, characterized in that: The contact surfaces of the independent body and the upper and lower raceways in the second and fourth quadrants of the bearing are machined into an arc shape.

5. The line-surface combined contact type wind turbine pitch slewing bearing according to claim 1, characterized in that: A positioning boss is machined on the inner diameter of the outer ring and the outer diameter of the inner ring at both ends of the double-row axial rolling unit.

Images