CN107830052B - Composite bearing - Google Patents
Composite bearing Download PDFInfo
- Publication number
- CN107830052B CN107830052B CN201711271059.4A CN201711271059A CN107830052B CN 107830052 B CN107830052 B CN 107830052B CN 201711271059 A CN201711271059 A CN 201711271059A CN 107830052 B CN107830052 B CN 107830052B
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- CN
- China
- Prior art keywords
- tapered roller
- thrust tapered
- bearing
- outer ring
- auxiliary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002131 composite material Substances 0.000 title claims abstract description 84
- 238000005096 rolling process Methods 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 150000001875 compounds Chemical group 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/50—Other types of ball or roller bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/34—Rollers; Needles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/34—Rollers; Needles
- F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
- F16C33/366—Tapered rollers, i.e. rollers generally shaped as truncated cones
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
A composite bearing comprises a main thrust tapered roller bearing, a centripetal cylindrical roller bearing and an auxiliary thrust tapered roller bearing which are sequentially arranged from front to back; the bearing consists of an outer ring, an inner ring, a main thrust tapered roller, an auxiliary thrust tapered roller, a cylindrical roller, a main thrust tapered roller retainer, an auxiliary thrust tapered roller retainer, a radial cylindrical roller retainer, an oil duct and a sealing strip, wherein the large ends of the main thrust tapered roller and the auxiliary thrust tapered roller are respectively contacted with a frame-shaped pocket of the main thrust tapered roller retainer and a frame-shaped pocket of the auxiliary thrust tapered roller retainer, and are not contacted with an outer ring flange, so that the bearing meets the physical condition of axial sliding self-locking of the tapered roller. The beneficial effects are that: the rollers and the rollaway nest are in pure rolling, the large ends of the tapered rollers do not generate sliding friction with the collar flange, the friction loss of the bearing is reduced, the bearing efficiency is improved, and the fatigue life is prolonged; the large-end contact state of the retainer and the tapered roller can be reasonably designed according to different use conditions, and the large-end contact state can be used as a slewing bearing.
Description
Technical Field
The invention belongs to the technical field of bearings, and particularly relates to a roller bearing.
Background
In the prior art, a composite bearing consisting of two single-row thrust cylindrical roller bearings and one single-row radial cylindrical roller bearing is commonly used as a main shaft bearing of a large machine. The defects of the existing bearing of the large mechanical main shaft are as follows: because the thrust cylindrical roller bearing can not realize pure rolling in operation and is continuous rolling and sliding, the roller and the roller path are easy to wear, the energy consumption is high, the efficiency of the bearing is low, and the service life is low.
In addition, even if two single-row thrust cylindrical roller bearings are changed into two single-row thrust tapered roller bearings, the inventor's research shows that the rollers cannot slide along the axial direction of the rollers only when the bearing is not rotated under load, once the bearing starts to rotate, the rollers can slide along the axial direction of the rollers from the small end to the large end of the rollers under the action of axial derivative force while rolling, so that the situation of rolling and sliding is formed until the large end of the rollers contacts with the collar flange, and sliding friction between the large end of the rollers and the flange is generated. This friction both consumes energy and reduces the efficiency and life of the bearing.
Disclosure of Invention
The invention aims to provide a composite bearing, wherein a thrust tapered roller bearing is used for replacing a thrust cylindrical roller bearing, so that the radial cylindrical roller bearing, a main tapered roller bearing and an auxiliary tapered roller bearing are all in pure rolling, and the sliding friction between tapered rollers and a ferrule raceway and a flange is avoided.
The invention aims to solve the technical problems of improving the bearing efficiency and the bearing fatigue life, and changing the working state of two rows of rolling bodies of the existing composite bearing axial load to change the sliding state of a rolling belt between the two rows of rolling bodies and a roller path into a pure rolling state, thereby avoiding the sliding friction generated by the contact of the large end of a roller and the flange of a ferrule, and furthest reducing the friction between the large end of the roller and a retainer.
The technical scheme of the invention is as follows: the compound bearing comprises a main thrust tapered roller bearing, a centripetal cylindrical roller bearing and an auxiliary thrust tapered roller bearing, wherein the main thrust tapered roller bearing, the centripetal cylindrical roller bearing and the auxiliary thrust tapered roller bearing are composed of an outer ring, an inner ring, main thrust tapered rollers, auxiliary thrust tapered rollers, cylindrical rollers, a main thrust tapered roller retainer, auxiliary thrust tapered roller retainers, radial cylindrical roller retainers, oil ducts and sealing strips, the taper half angles of tapered rollers of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are equal to those of a frustum-shaped raceway with corresponding cross sections, and the taper vertexes of the tapered rollers of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are respectively positioned on the axes of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing; the geometric parameters of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing meet the pure rolling condition of the rollers, and the method is characterized in that: the outer surface of the outer ring of the composite bearing is a circular ring surface, the inner surface of the outer ring of the composite bearing is a stepped inner ring surface, three layers are provided, the middle of the outer ring of the composite bearing is a bottom layer step, and two layers of steps are arranged on two sides of the outer ring of the composite bearing; the inner surface of the inner ring is a circular ring surface, the outer surface of the inner ring is a stepped outer ring surface, and the inner ring is high in the middle and low in the two sides; the raceways on the outer surface of the inner ring and the inner surface of the outer ring are respectively: the outer ring axial rollaway nest of the inner surface of the outer ring front and rear vertical walls, the outer ring radial rollaway nest of the bottom layer ladder bottom surface of the outer ring, the inner ring axial rollaway nest of the vertical walls outside the inner ring and the inner ring radial rollaway nest of the middle boss top surface outside the inner ring, the outer ring axial rollaway nest of the inner ring front and rear vertical walls comprises an outer ring front radial rollaway nest and an outer ring rear axial rollaway nest, the inner ring axial rollaway nest of the vertical walls outside the inner ring and the outer ring vertical walls comprises an inner ring front axial rollaway nest and an inner ring rear axial rollaway nest, and the outer ring front axial rollaway nest, the inner ring front axial rollaway nest, the main thrust tapered rollers and the main thrust tapered roller retainer form a main thrust tapered roller bearing; the outer ring rear axial roller path, the inner ring rear axial roller path, the auxiliary thrust tapered roller and the auxiliary thrust tapered roller retainer form an auxiliary thrust tapered roller bearing; the outer ring radial roller path, the inner ring radial roller path, the cylindrical rollers and the radial cylindrical roller retainer form a centripetal cylindrical roller bearing, and a main thrust tapered roller bearing, a centripetal cylindrical roller bearing and an auxiliary thrust tapered roller bearing which are sequentially arranged from front to back are formed; the center points of the large end surfaces of the main thrust tapered roller and the auxiliary thrust tapered roller of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are respectively contacted with the center points of the top surfaces of the frame-shaped pockets of the main thrust tapered roller retainer and the center points of the top surfaces of the frame-shaped pockets of the auxiliary thrust tapered roller retainer, and are not contacted with the flange of the ferrule raceway of the outer ring, and the top surfaces of the frame-shaped pockets are the surfaces of the frame-shaped pockets contacted with the large end surfaces of the tapered rollers; the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing also meet the physical condition of self-locking of the axial sliding of the rollers, namely, the conditions
Wherein phi is the taper half angle of the tapered roller, mu is the sliding friction coefficient between the tapered roller and the roller path,Is corresponding to the sliding friction coefficient muFriction angle.
The invention relates to a composite bearing, which is characterized in that: the large end faces of the main thrust tapered roller and the auxiliary thrust tapered roller of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are planes perpendicular to the axes of the tapered rollers or axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes, the frame pocket top faces of the main thrust tapered roller retainer and the frame pocket top faces of the auxiliary thrust tapered roller retainer are planes perpendicular to the axes of the tapered rollers respectively, axisymmetric curved surfaces taking the axes of the tapered rollers respectively as symmetry axes or curved surfaces which are formed by rotating the curved surfaces which are in the planes perpendicular to the rotation planes of the axes of the tapered rollers and are symmetrical to the axes of the tapered rollers and have no inflection points, and the large end faces of the main thrust tapered roller and the auxiliary thrust tapered roller are in matched contact with the frame pocket top faces of the main thrust tapered roller retainer and the frame pocket top faces of the auxiliary thrust tapered roller retainer.
The invention relates to a composite bearing, which is characterized in that: the main thrust tapered roller and the auxiliary thrust tapered roller are respectively matched and contacted with the center point of the top surface of the frame-shaped pocket of the main thrust tapered roller retainer and the center point of the top surface of the frame-shaped pocket of the auxiliary thrust tapered roller retainer in the following modes:
1) The large end surfaces of the main thrust tapered roller and the auxiliary thrust tapered roller are concave axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes, and the frame-shaped pocket top surface of the main thrust tapered roller retainer and the frame-shaped pocket top surface of the auxiliary thrust tapered roller retainer are convex axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes;
2) The large end faces of the main thrust tapered roller and the auxiliary thrust tapered roller are planes perpendicular to the axes of the tapered rollers; the top surface of the frame-shaped pocket of the main thrust tapered roller retainer and the top surface of the frame-shaped pocket of the auxiliary thrust tapered roller retainer are plane surfaces, outward convex axisymmetric curved surfaces or rotating curved surfaces; when the frame-shaped pocket of the main thrust tapered roller retainer and the frame-shaped pocket of the auxiliary thrust tapered roller retainer are in plane contact with the main thrust tapered roller and the large end plane of the auxiliary thrust tapered roller, the planes of the frame-shaped pocket of the main thrust tapered roller retainer and the frame-shaped pocket of the auxiliary thrust tapered roller retainer, which are in plane contact with the main thrust tapered roller and the large end plane of the auxiliary thrust tapered roller, are perpendicular to the axes of the respective tapered rollers, and the center points of the planes of the frame-shaped pocket of the main thrust tapered roller retainer and the frame-shaped pocket of the auxiliary thrust tapered roller retainer, which are in plane contact with the main thrust tapered roller and the large end plane of the auxiliary thrust tapered roller, are in contact with the center points of the large end planes of the respective tapered rollers; when the frame pocket of the main thrust tapered roller retainer and the frame pocket of the auxiliary thrust tapered roller retainer are in contact with the main thrust tapered roller and the large end plane of the auxiliary thrust tapered roller to form an outer convex axisymmetric curved surface, the outer convex axisymmetric curved surfaces of the frame pocket of the main thrust tapered roller retainer and the frame pocket of the auxiliary thrust tapered roller retainer are in contact with the central points of the outer convex axisymmetric curved surfaces of the main thrust tapered roller and the large end plane of the auxiliary thrust tapered roller by taking the axes of the tapered rollers as symmetry axes, and the central points of the outer convex axisymmetric curved surfaces of the frame pocket of the main thrust tapered roller retainer and the frame pocket of the auxiliary thrust tapered roller retainer are in contact with the central points of the main thrust tapered roller and the large end plane of the auxiliary thrust tapered roller; when the parts of the frame-shaped pocket holes of the main thrust tapered roller retainer and the frame-shaped pocket holes of the auxiliary thrust tapered roller retainer, which are in contact with the plane of the frame-shaped pocket holes of the main thrust tapered roller retainer and the plane of the large ends of the auxiliary thrust tapered rollers, are rotating curved surfaces, wherein the rotating curved surfaces are formed by rotating curved lines which are symmetrical to the axes of the tapered rollers in a plane perpendicular to the axes of the main thrust tapered rollers and the auxiliary thrust tapered rollers and have no inflection points around the perpendicular line which is positioned in the plane of the curved lines and perpendicularly intersects the axes of the tapered rollers, and the central points of the frame-shaped pocket holes of the main thrust tapered rollers and the large ends of the auxiliary thrust tapered rollers are in line contact with the rotating curved surfaces of the frame-shaped pocket holes of the main thrust tapered roller retainer and the frame-shaped pocket holes of the auxiliary thrust tapered rollers;
3) The large end surfaces of the main thrust tapered roller and the auxiliary thrust tapered roller are convex axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes; the top surfaces of the frame-shaped pocket of the main thrust tapered roller retainer and the frame-shaped pocket of the auxiliary thrust tapered roller retainer are plane surfaces, convex axisymmetric curved surfaces, concave axisymmetric curved surfaces or rotating curved surfaces; when the frame pocket of the main thrust tapered roller retainer and the frame pocket of the auxiliary thrust tapered roller retainer are in contact with the axisymmetric curved surfaces of the main thrust tapered roller and the outer convex of the large end of the auxiliary thrust tapered roller, the plane of the frame pocket of the main thrust tapered roller retainer and the axisymmetric curved surfaces of the main thrust tapered roller and the large end of the auxiliary thrust tapered roller are perpendicular to the axis of the respective tapered roller, and when the center point of the plane of the frame pocket of the main thrust tapered roller retainer and the frame pocket of the auxiliary thrust tapered roller retainer, which is in contact with the axisymmetric curved surfaces of the main thrust tapered roller and the large end of the auxiliary thrust tapered roller, is in contact with the center point of the axisymmetric curved surfaces of the main thrust tapered roller and the large end of the auxiliary thrust tapered roller, the frame pocket of the main thrust tapered roller retainer and the axisymmetric curved surfaces of the large end of the auxiliary thrust tapered roller are in contact with the axisymmetric curved surfaces of the outer convex of the axisymmetric tapered roller or the inner concave axisymmetric curved surfaces of the main thrust tapered roller, and the frame pocket of the main thrust tapered roller retainer (8) and the axisymmetric curved surfaces of the main thrust tapered roller and the inner tapered roller are in contact with the axisymmetric curved surfaces of the main tapered roller or the inner concave tapered surface of the main tapered roller; the frame-shaped pocket of the main thrust tapered roller retainer and the frame-shaped pocket of the auxiliary thrust tapered roller retainer are contacted with the convex axisymmetric curved surface of the main thrust tapered roller and the large end of the auxiliary thrust tapered roller or the center point of the concave axisymmetric curved surface is contacted with the center point of the convex axisymmetric curved surface of the large end of the respective tapered roller; when the frame pocket of the main thrust tapered roller retainer and the frame pocket of the auxiliary thrust tapered roller retainer are in contact with the axisymmetric curved surfaces of the outer protrusions of the large ends of the main thrust tapered roller and the auxiliary thrust tapered roller to form a rotating curved surface, the rotating curved surface is formed by rotating a curve which is symmetrical to the axes of the main thrust tapered roller and the auxiliary thrust tapered roller and has no inflection point in a plane perpendicular to the axes of the main thrust tapered roller and the auxiliary thrust tapered roller, around a perpendicular line which is positioned in the plane of the curve and perpendicularly intersects the axes of the respective tapered rollers, and the center point of the axisymmetric curved surfaces of the outer protrusions of the large ends of the main thrust tapered roller and the auxiliary thrust tapered roller is in point contact with the rotating curved surface of the frame pocket of the frame main thrust tapered roller retainer and the axisymmetric curved surfaces of the auxiliary thrust tapered roller retainer.
The invention relates to a composite bearing, which is characterized in that: the rotating curved surfaces of the frame-shaped pocket holes of the main thrust tapered roller retainer and the frame-shaped pocket holes of the auxiliary thrust tapered roller retainer, which are contacted with the large end surfaces of the main thrust tapered roller and the auxiliary thrust tapered roller, are concave rotating curved surfaces or convex rotating curved surfaces.
The invention relates to a composite bearing, which is characterized in that: the front and rear raceways of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are respectively front and rear symmetrical or front and rear asymmetrical, and the front and rear symmetrical is that the included angle between the front and rear raceways and the perpendicular line of the bearing axis is the tapered half angle of the main thrust tapered roller and the auxiliary thrust tapered roller; the front-back asymmetry is that the included angle between the front rolling path or the rear rolling path and the vertical line of the main bearing axis of the shield machine is 0 degree, and the included angle between the rear rolling path or the front rolling path and the vertical line of the main bearing axis of the shield machine is 2 times of the cone half angles of the main thrust cone roller and the auxiliary thrust cone roller, namely, the included angle is equal to the cone angle.
The invention relates to a composite bearing, which is characterized in that: the outer ring is an integral outer ring or a split outer ring, and when the outer ring is the split outer ring, the outer ring is formed by relatively combining a front outer ring and a rear outer ring.
The invention relates to a composite bearing, which is characterized in that: the inner ring is an integral inner ring or a split inner ring, and when the inner ring is the split inner ring, the inner ring is formed by oppositely combining a front inner ring and a rear inner ring.
The invention relates to a composite bearing, which is characterized in that: the outer ring radial roller path is formed by the bottom surface of a front outer ring bottom layer ladder, the bottom surface of a rear outer ring bottom layer ladder or the bottom surface of the front outer ring bottom layer ladder and the bottom surface of the rear outer ring bottom layer ladder together.
The invention relates to a composite bearing, which is characterized in that: the outer ring and the inner ring are provided with flanges or are not provided with flanges.
The beneficial effects of the invention are as follows: the radial cylindrical roller bearing and the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing of the composite bearing are all purely rolling, the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing both meet the condition of self-locking along the axial sliding of the tapered roller between the roller and the ferrule, the large end of the tapered roller is not contacted with the flange of the ferrule, and the sliding friction between the thrust bearing roller and the raceway and the flange of the ferrule is avoided, so that compared with the conventional composite shaft bearing, the friction loss of the two thrust roller bearings is greatly reduced, and the efficiency and the fatigue life of the bearing are improved. The contact state of the retainer and the tapered roller is enriched due to different designs of the geometric shape of the end face of the tapered roller large end and the geometric shape of the contact surface of the frame-shaped pocket of the retainer, so that the contact state of the retainer and the tapered roller large end can be reasonably designed according to different use conditions, the friction and lubrication conditions of the retainer and the tapered roller large end are improved to the greatest extent, and the service life of the bearing is prolonged. The composite bearing can be applied to different working positions, and can be used as a slewing bearing by rotating the composite bearing by 90 degrees.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of a composite bearing of the present invention, in which an inner ring is integral, an outer ring is split, and front and rear ring raceways of a main thrust tapered roller bearing and a secondary thrust tapered roller bearing are in a front-rear symmetrical structure.
Fig. 2A is a schematic structural diagram of an embodiment 2 of a composite bearing of the present invention, in which an inner ring is monolithic, an outer ring is split, front and rear ring raceways of a main thrust tapered roller bearing and a secondary thrust tapered roller bearing are asymmetric from front to rear, two axial raceways of the inner ring are perpendicular to an axis of the composite bearing, and an included angle between the axial raceways of the front and rear outer rings and a perpendicular line of the axis of the composite bearing is 2 times of a tapered half angle of the roller.
Fig. 2B is a schematic structural diagram of embodiment 3 of a composite bearing according to the present invention, in which an inner ring is monolithic, an outer ring is split, front and rear ring raceways of main and auxiliary thrust tapered roller bearings are asymmetric, axial raceways of the front and rear outer rings are perpendicular to an axis of the composite bearing, and an included angle between two axial raceways of the inner ring and a perpendicular line of the axis of the composite bearing is 2 times of a tapered half angle of the roller.
Fig. 2C is a schematic structural diagram of embodiment 4 of the composite bearing of the present invention, in which the inner ring is monolithic, the outer ring is split, front and rear ring raceways of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are asymmetric, axial raceways of the front outer ring and the rear inner ring are perpendicular to the axis of the composite bearing, and included angles between the axial raceways of the rear outer ring and the front inner ring and the perpendicular to the axis of the composite bearing are all 2 times of the tapered roller angle.
Fig. 3 is a schematic structural view of an embodiment 5 of the composite bearing of the present invention, in which the radial roller bearing is constituted by a rear outer ring radial raceway, an inner ring radial raceway, cylindrical rollers and a radial cylindrical roller cage.
Fig. 4 (a) is a schematic structural view of embodiment 6 of the composite bearing of the present invention, in which the ring raceways of the main and auxiliary tapered roller bearings are symmetrical in structure, and the outer ring and the split inner ring are integral.
Fig. 4 (B) is a schematic structural diagram of embodiment 7 of the composite bearing of the present invention, which is a structural form of an integral outer ring and a split inner ring, wherein two axial raceways of the inner ring are perpendicular to the axis of the composite bearing, and the included angles between the front and rear axial raceways of the outer ring and the perpendicular to the axis of the composite bearing are all 2 times of the tapered half angle of the roller.
Fig. 4 (C) is a schematic structural view of an embodiment 8 of the composite bearing according to the present invention, which is a structural form of an integral outer ring and a split inner ring, wherein the front and rear axial raceways of the outer ring are perpendicular to the axis of the composite bearing, and the included angles between the front and rear axial raceways of the inner ring and the perpendicular to the axis of the composite bearing are all 2 times the tapered half angle of the roller.
Fig. 4 (D) is a schematic structural view of embodiment 9 of the composite bearing of the present invention, which is a structural form of an integral outer ring and a split inner ring, wherein rear axial raceways of the front inner ring and the outer ring are perpendicular to the axis of the composite bearing, and included angles between the rear inner ring, the front axial raceways of the outer ring and the perpendicular to the axis of the composite bearing are all 2 times of the tapered half angle of the roller.
Fig. 5 (a) is a schematic view of a partial structure in which the raceway of the composite bearing main thrust tapered roller bearing of the present invention is symmetrical, the large end face of the main thrust tapered roller is an inward concave axisymmetric curved surface, the contact between the frame-shaped pocket of the main thrust tapered roller retainer (8) and the inward concave axisymmetric curved surface of the large end of the main thrust tapered roller is an outward convex axisymmetric curved surface, the large end of the tapered roller is not in contact with the flanges of the front and rear ferrule raceways, and the tapered roller is in contact with the retainer.
Fig. 5 (B) is a schematic view of a partial structure in which the raceway of the composite bearing main thrust tapered roller bearing of the present invention is asymmetric, the large end face of the main thrust tapered roller is an axially symmetric curved surface which is concave, the contact portion of the frame-shaped pocket of the main thrust tapered roller retainer (8) and the axially symmetric curved surface which is concave at the large end of the main thrust tapered roller is an axially symmetric curved surface which is convex, the large end of the tapered roller is not in contact with the flanges of the front and rear ferrule raceways, and is in contact with the retainer.
Fig. 6 (a) is a schematic view of a partial structure in which the raceway of the composite bearing main thrust tapered roller bearing of the present invention is symmetrical, the large end face of the main thrust tapered roller is a plane, the contact portion of the frame-shaped pocket hole of the main thrust tapered roller retainer (8) and the large end plane of the main thrust tapered roller is an axisymmetric curved surface protruding outward, the large end of the tapered roller is not contacted with the rims of the front and rear race raceways, and is contacted with the retainer.
Fig. 6 (B) is a schematic view of a partial structure in which the raceway symmetry of the composite bearing main thrust tapered roller bearing of the present invention is such that the large end face of the main thrust tapered roller is a plane, the frame-shaped pocket of the main thrust tapered roller retainer (8) is a plane with a chamfer at the contact portion with the large end plane of the main thrust tapered roller, and the large end of the tapered roller is not in contact with the rims of the front and rear race raceways, and is in contact with the retainer.
Fig. 6 (C) is a schematic view of a partial structure in which the raceway of the composite bearing main thrust tapered roller bearing of the present invention is asymmetric, the large end face of the main thrust tapered roller is a plane, the center of the plane is provided with a groove, the plane contact portion of the frame-shaped pocket hole of the main thrust tapered roller retainer (8) and the large end of the main thrust tapered roller is a plane, the center of the plane is provided with a boss matched with the plane groove of the large end of the tapered roller, the large end of the tapered roller is not contacted with the flanges of the raceways of the front and rear ferrules, and the tapered roller is contacted with the retainer.
Fig. 6 (D) is a schematic view of a partial structure in which the raceway of the composite bearing main thrust tapered roller bearing of the present invention is asymmetric, the large end face of the main thrust tapered roller is a plane, the boss is provided at the center of the plane, the plane contact portion of the frame pocket of the main thrust tapered roller retainer (8) and the large end face of the main thrust tapered roller is a plane, the center of the plane is provided with a groove matched with the boss of the large end face of the tapered roller, the large end of the tapered roller is not contacted with the flanges of the raceways of the front and rear ferrules, and the tapered roller is contacted with the retainer.
Fig. 7 (a) is a schematic view of a partial structure in which the raceway of the composite bearing main thrust tapered roller bearing of the present invention is symmetrical, the large end face of the main thrust tapered roller is an axisymmetric curved surface protruding outward, the contact portion of the frame-shaped pocket of the main thrust tapered roller retainer (8) and the axisymmetric curved surface protruding outward of the large end of the main thrust tapered roller is a plane, the large end of the tapered roller is not in contact with the flanges of the front and rear ferrule raceways, and is in contact with the retainer.
Fig. 7 (B) is a schematic view of a partial structure in which the raceway of the composite bearing main thrust tapered roller bearing of the present invention is symmetrical, the large end face of the main thrust tapered roller is an axially symmetrical curved surface protruding outward, the contact portion of the frame-shaped pocket of the main thrust tapered roller retainer (8) and the axially symmetrical curved surface protruding outward of the large end of the main thrust tapered roller is an axially symmetrical curved surface protruding outward, the large end of the tapered roller is not in contact with the flanges of the front and rear ferrule raceways, and is in contact with the retainer.
Fig. 7 (C) is a schematic view of a partial structure in which the raceway symmetry of the composite bearing main thrust tapered roller bearing of the present invention is such that the large end face of the main thrust tapered roller is an axially symmetrical curved surface which is convex, the contact portion of the frame-shaped pocket hole of the main thrust tapered roller retainer (8) and the axially symmetrical curved surface which is convex at the large end of the main thrust tapered roller is an axially symmetrical curved surface which is concave, the large end of the tapered roller is not in contact with the flanges of the front and rear ferrule raceways, and is in contact with the retainer.
Fig. 7 (D) is a schematic view of a partial structure in which the non-raceway symmetry of the composite bearing main thrust tapered roller bearing of the present invention, the large end face of the main thrust tapered roller is an axially symmetrical curved surface protruding outward, the contact portion of the frame-shaped pocket of the main thrust tapered roller retainer and the axially symmetrical curved surface protruding outward of the large end of the main thrust tapered roller is an axially symmetrical curved surface recessed inward, the large end of the tapered roller is not in contact with the rims of the front and rear race raceways, and the tapered roller is in contact with the retainer.
In the figure, 1-a rear outer ring; 2-cylindrical rollers; 3-a cylindrical roller cage; 4-auxiliary tapered rollers; 5-auxiliary tapered roller retainer; 6-a front outer ring; 7-a main tapered roller; 8-a main tapered roller cage; 9-inner ring.
Detailed Description
The invention is further described below with reference to the drawings and examples.
The compound bearing comprises a main thrust tapered roller bearing, a centripetal cylindrical roller bearing and an auxiliary thrust tapered roller bearing, wherein the main thrust tapered roller bearing, the centripetal cylindrical roller bearing and the auxiliary thrust tapered roller bearing are composed of an outer ring, an inner ring 9, a main thrust tapered roller 7, an auxiliary thrust tapered roller 4, a cylindrical roller 2, a main thrust tapered roller retainer 8, an auxiliary thrust tapered roller retainer 5, a radial cylindrical roller retainer 3, an oil duct and a sealing strip, the cone half angles of tapered rollers 4 and 7 of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are equal to the cone half angles of tapered raceways with corresponding cross sections, and the cone apexes of the tapered rollers 4 and 7 of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are respectively positioned on the axes of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing; the geometric parameters of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing meet the pure rolling condition of the rollers, the outer surface of the outer ring is a circular ring surface, the inner surface of the outer ring is a stepped inner ring surface, three layers are provided, the middle is a bottom layer step, and two layers of steps are arranged on two sides of the outer ring; the inner surface of the inner ring 9 is a circular ring surface, the outer surface is a stepped outer ring surface, and the inner surface is high in the middle and low in the two sides; the raceways on the outer surface of the inner ring 9 and the inner surface of the outer ring are respectively: the outer ring axial rollaway nest of the inner surface of the outer ring front and rear vertical walls, the outer ring radial rollaway nest of the bottom ladder bottom surface of the outer ring, the inner ring axial rollaway nest of the vertical wall opposite to the outer ring vertical walls outside the inner ring 9 and the inner ring radial rollaway nest of the boss top surface in the middle part outside the inner ring 9, the outer ring axial rollaway nest of the inner ring front and rear vertical walls comprises an outer ring front radial rollaway nest and an outer ring rear axial rollaway nest, the outer ring front axial rollaway nest, the inner ring front axial rollaway nest, the main thrust tapered roller and the main thrust tapered roller retainer form a main thrust tapered roller bearing; the outer ring rear axial roller path, the inner ring rear axial roller path, the auxiliary thrust tapered roller and the auxiliary thrust tapered roller retainer form an auxiliary thrust tapered roller bearing; the outer ring radial roller path, the inner ring radial roller path, the cylindrical rollers and the radial cylindrical roller retainer form a centripetal cylindrical roller bearing, and a main thrust tapered roller bearing, a centripetal cylindrical roller bearing and an auxiliary thrust tapered roller bearing which are sequentially arranged from front to back are formed; the center points of the large end surfaces of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing, namely the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4, are respectively contacted with the center points of the frame pocket top surface of the main thrust tapered roller retainer 8 and the frame pocket top surface of the auxiliary thrust tapered roller retainer 5, are not contacted with the flange of the outer ring, and the frame pocket top surface refers to the surface of the frame pocket contacted with the large end surface of the tapered roller; the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing also meet the physical condition of self-locking of the axial sliding of the rollers, namely, the conditions
Wherein phi is the taper half angle of the tapered roller, mu is the sliding friction coefficient between the tapered roller and the roller path,Is the friction angle corresponding to the sliding friction coefficient mu.
The large end surfaces of the main tapered roller 7 and the auxiliary tapered roller 4 of the main tapered roller bearing and the auxiliary tapered roller bearing are planes perpendicular to the axes of the tapered rollers or axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes, the frame pocket top surfaces of the main tapered roller retainer 8 and the frame pocket top surfaces of the auxiliary tapered roller retainer 5 are planes perpendicular to the axes of the tapered rollers 4 and 7 respectively, axisymmetric curved surfaces taking the axes of the tapered rollers 4 and 7 respectively as symmetry axes or curved surfaces formed by rotation of the curved surfaces which are symmetric to the axes of the tapered rollers and are not inflection points in a plane perpendicular to the rotation plane of the axes of the tapered rollers respectively, and the large end surfaces of the main tapered roller 7 and the auxiliary tapered roller 4 are in matched contact with the frame pocket top surfaces of the main tapered roller retainer 8 and the frame pocket top surfaces of the auxiliary tapered roller retainer 5 around the perpendicular lines which are located in the plane perpendicular to the axes of the tapered rollers.
The large end surfaces of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4 are respectively in matched contact with the top surface of the frame-shaped pocket of the main thrust tapered roller retainer 8 and the top surface of the frame-shaped pocket of the auxiliary thrust tapered roller retainer 5, and the form is one of the following:
1) The large end surfaces of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4 are concave axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes, and the parts of the frame-shaped pocket of the main thrust tapered roller retainer 8 and the frame-shaped pocket of the auxiliary thrust tapered roller retainer 5, which are contacted with the concave axisymmetric curved surfaces of the large ends of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4, are convex axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes; the center points of the axisymmetric curved surfaces of the frame-shaped pocket holes of the main thrust tapered roller retainer 8 and the frame-shaped pocket Kong Waitu of the auxiliary thrust tapered roller retainer 5 are contacted with the center points of the large-end concave axisymmetric curved surfaces of the main thrust tapered rollers 7 and the auxiliary thrust tapered rollers 4;
2) The large end surfaces of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4 are planes, and the large end planes of the tapered rollers are perpendicular to the axes of the tapered rollers; the parts of the frame-shaped pocket top surface of the main thrust tapered roller retainer 8 and the frame-shaped pocket top surface of the auxiliary thrust tapered roller retainer 5, which are contacted with the large end planes of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4, are plane, convex axisymmetric curved surfaces or convex rotating curved surfaces; when the frame pocket top surface of the main thrust tapered roller retainer 8 and the frame pocket top surface of the auxiliary thrust tapered roller retainer 5 are in plane contact with the main thrust tapered roller 7 and the large end plane of the auxiliary thrust tapered roller 4, the plane of the frame pocket top surface of the main thrust tapered roller retainer 8 and the plane of the frame pocket top surface of the auxiliary thrust tapered roller retainer 5, which are in contact with the main thrust tapered roller 7 and the large end plane of the auxiliary thrust tapered roller 4, is perpendicular to the axis of the respective tapered roller, and the center point of the plane of the frame pocket top surface of the main thrust tapered roller retainer 8 and the frame pocket top surface of the auxiliary thrust tapered roller retainer 5, which are in contact with the main thrust tapered roller 7 and the large end plane of the auxiliary thrust tapered roller 4, is in contact with the center point of the large end plane of the respective tapered roller; when the frame pocket top surface of the main thrust tapered roller retainer 8 and the frame pocket top surface of the auxiliary thrust tapered roller retainer 5 are in contact with the main thrust tapered roller 7 and the large end plane of the auxiliary thrust tapered roller 4 to form an outer convex axisymmetric curved surface, the outer convex axisymmetric curved surfaces of the frame pocket top surface of the main thrust tapered roller retainer 8 and the frame pocket top surface of the auxiliary thrust tapered roller retainer 5 are in contact with the central points of the outer convex axisymmetric curved surfaces of the main thrust tapered roller 7 and the large end plane of the auxiliary thrust tapered roller 4 by taking the axes of the respective tapered rollers as symmetric axes, and the central points of the outer convex axisymmetric curved surfaces of the frame pocket top surface of the main thrust tapered roller retainer 8 and the frame pocket top surface of the auxiliary thrust tapered roller retainer 5 are in contact with the central points of the large end planes of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4; when the parts of the frame pocket top surfaces of the main thrust tapered roller retainer 8 and the frame pocket top surfaces of the auxiliary thrust tapered roller retainer 5, which are in contact with the plane of the large ends of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4, are rotating curved surfaces, the rotating curved surfaces are formed by curves which are symmetrical to the axes of the respective tapered rollers and have no inflection points in the planes perpendicular to the axes of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4, and rotate around the perpendicular lines which are positioned in the planes of the curves and perpendicularly intersect the axes of the tapered rollers, and the central points of the frame pocket top surfaces of the main thrust tapered roller 7 and the large ends of the auxiliary thrust tapered roller 4 are in contact with the central points of the rotating curved surfaces of the frame pocket top surfaces of the main thrust tapered roller retainer 8 and the frame pocket top surfaces of the auxiliary thrust tapered roller retainer 5;
3) The large end faces of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4 are convex axisymmetric curved surfaces, and the convex axisymmetric curved surfaces of the large end faces take the axes of the tapered rollers as symmetric axes; the parts of the frame-shaped pocket top surface of the main thrust tapered roller retainer 8 and the frame-shaped pocket top surface of the auxiliary thrust tapered roller retainer 5, which are in contact with the convex axisymmetric surfaces of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4, are a plane, a convex axisymmetric surface, a concave axisymmetric surface or a rotating curved surface; when the frame pocket top surface of the main thrust tapered roller retainer 8 and the frame pocket top surface of the auxiliary thrust tapered roller retainer 5 are in contact with the axisymmetric curved surface of the main thrust tapered roller 7 and the large end of the auxiliary thrust tapered roller 4 to form a plane, the frame pocket top surface of the main thrust tapered roller retainer 8 and the frame pocket top surface of the auxiliary thrust tapered roller retainer 5 are in contact with the axisymmetric curved surface of the main thrust tapered roller 7 and the large end of the auxiliary thrust tapered roller 4 to form a plane perpendicular to the axis of the respective tapered roller, and the center point of the plane of the frame pocket top surface of the main thrust tapered roller retainer 8 and the frame pocket top surface of the auxiliary thrust tapered roller retainer 5 in contact with the axisymmetric curved surface of the main thrust tapered roller 7 and the large end of the auxiliary thrust tapered roller 4 is in contact with the center point of the axisymmetric curved surface of the axisymmetric tapered roller 7 and the large end of the auxiliary tapered roller 4 to form an axisymmetric curved surface of the main thrust tapered roller 7 and the large end of the main tapered roller 4 to form a concave tapered roller, and the axisymmetric tapered roller of the main thrust tapered roller retainer 8 is in contact with the axisymmetric curved surface of the main thrust tapered roller 7 and the large end of the concave tapered roller; the top surface of the frame-shaped pocket of the main thrust tapered roller retainer 8 and the top surface of the frame-shaped pocket of the auxiliary thrust tapered roller retainer 5 are contacted with the convex axisymmetric curved surface of the main thrust tapered roller 7 and the convex axisymmetric curved surface of the large end of the auxiliary thrust tapered roller 4 or the center point of the concave axisymmetric curved surface is contacted with the center point of the convex axisymmetric curved surface of the large end of the respective tapered roller; when the frame pocket top surfaces of the main thrust tapered roller retainer 8 and the frame pocket top surfaces of the auxiliary thrust tapered roller retainer 5 are in contact with the axisymmetric curved surfaces of the main thrust tapered roller 7 and the large end of the auxiliary thrust tapered roller 4, which are convex outward, are the rotating curved surfaces, the rotating curved surfaces are formed by rotating curved surfaces which are symmetrical to the axes of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4 and have no inflection points in a plane perpendicular to the axes of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4, around the perpendicular line which is positioned in the plane of the curved surfaces and perpendicularly intersects the axes of the respective tapered rollers, and the center points of the axisymmetric curved surfaces of the main thrust tapered roller 7 and the large end of the auxiliary thrust tapered roller 4 are in point contact with the rotating curved surfaces of the frame pocket top surfaces of the main thrust tapered roller retainer 8 and the frame pocket top surfaces of the auxiliary thrust tapered roller retainer 5.
The rotation curved surfaces of the frame-shaped pocket top surfaces of the main thrust tapered roller retainer 8 and the frame-shaped pocket top surfaces of the auxiliary thrust tapered roller retainer 5, which are in contact with the large end surfaces of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4, are concave rotation curved surfaces or convex rotation curved surfaces.
The front and rear raceways of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are respectively front and rear symmetrical or front and rear asymmetrical, and the front and rear symmetrical is that the included angle between the front and rear raceways and the perpendicular line of the bearing axis is the conical half angle of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4; the front-back asymmetry is that the included angle between the front rolling path or the rear rolling path and the vertical line of the main bearing axis of the shield machine is 0 degree, and the included angle between the rear rolling path or the front rolling path and the vertical line of the main bearing axis of the shield machine is 2 times of the cone half angles of the main thrust tapered roller 7 and the auxiliary thrust tapered roller 4, namely, the included angle is equal to the cone angle.
The outer ring is an integral outer ring or a split outer ring, and when the outer ring is the split outer ring, the outer ring is formed by relatively combining a front outer ring 6 and a rear outer ring 1. The inner ring is an integral inner ring or a split inner ring, and when the inner ring is the split inner ring, the inner ring is formed by oppositely combining a front inner ring and a rear inner ring.
The outer ring radial roller path is formed by the bottom surface of the front outer ring bottom layer ladder, the bottom surface of the rear outer ring bottom layer ladder or the bottom surface of the front outer ring bottom layer ladder and the bottom surface of the rear outer ring bottom layer ladder together.
The main parameter of the main thrust tapered roller bearing of the embodiment is the radius r of the large end of the tapered roller d1 Length of tapered roller L=45 (mm) r1 =90 (mm), conical half angle 2.207 °, bearing pitch diameter 2245 (mm); the roller radius of the cylindrical roller bearing is 45 (mm), the roller length is 45 (mm), and the pitch diameter of the cylindrical roller bearing is 2394 (mm); the main parameter of the auxiliary thrust tapered roller bearing is the large end radius r of the tapered roller d1 Length of tapered roller L =25 (mm) r1 =50 (mm), conical half angle 1.226 °, bearing pitch diameter 2285 (mm).
Example 1
Is a main shaft bearing of the shield machine. As shown in fig. 1. The inner ring is integral, the outer ring is split, and front and rear ferrule raceways of the main and auxiliary thrust tapered roller bearings are symmetrical front and rear.
Example 2
As shown in fig. 2 (a), the inner ring is integral, the outer ring is split, front and rear ring raceways of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are front and rear asymmetric, two axial raceways of the inner ring are perpendicular to the axis of the composite bearing, and the included angle between the axial raceways of the front and rear outer rings and the perpendicular of the axis of the composite bearing is 2 times of the tapered half angle of the rollers.
Example 3
As shown in fig. 2 (B). The inner ring is integral, the outer ring is split type, front and rear ferrule rollways of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are front and rear asymmetric, axial rollways of the front and rear outer rings are vertical to the axis of the composite bearing, and an included angle between two axial rollways of the inner ring and the vertical line of the axis of the composite bearing is 2 times of the structural form of the tapered half angle of the roller.
Example 4
As shown in fig. 2 (C), the inner ring is integral, the outer ring is split, front and rear ring raceways of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are front and rear asymmetric, axial raceways of the front outer ring and the rear inner ring are perpendicular to the axis of the composite bearing, and included angles between the axial raceways of the rear outer ring and the front inner ring and the perpendicular to the axis of the composite bearing are all in a structural form of 2 times of the tapered half angle of the roller.
Example 5
As shown in fig. 3, the radial roller bearing is formed by a rear outer ring radial raceway, an inner ring radial raceway, cylindrical rollers and a radial cylindrical roller retainer.
Example 6
As shown in fig. 4 (a), the integral outer ring and the split inner ring have a symmetrical structure of the race tracks of the main and auxiliary thrust tapered roller bearings.
Example 7
As shown in fig. 4 (B), the integral outer ring and the split inner ring have two axial raceways perpendicular to the axis of the composite bearing, and the angles between the front and rear axial raceways of the outer ring and the perpendicular to the axis of the composite bearing are all 2 times the half angle of the cone of the roller.
Example 8
As shown in fig. 4 (C), the integral outer ring and the split inner ring have the structure that the axial roller paths of the front and rear outer rings are perpendicular to the axis of the composite bearing, and the included angles between the axial roller paths of the front and rear inner rings and the perpendicular to the axis of the composite bearing are 2 times the tapered half angle of the roller.
Example 9
As shown in fig. 4 (D), the integral outer ring and the split inner ring have the structure that the rear axial roller paths of the front inner ring and the outer ring are perpendicular to the axis of the composite bearing, and the included angles between the rear axial roller paths of the rear inner ring and the outer ring and the perpendicular to the axis of the composite bearing are 2 times of the tapered half angle of the roller.
Example 10
As shown in fig. 5 (a), the raceways of the main thrust tapered roller bearing of the composite bearing are symmetrical, the large end face of the main thrust tapered roller is an inward concave axisymmetric curved surface, the frame-shaped pocket of the main thrust tapered roller retainer 8 is in contact with the inward concave axisymmetric curved surface of the large end of the main thrust tapered roller to be an outward convex axisymmetric curved surface, and the large end of the tapered roller is not in contact with the flanges of the raceways of the front and rear ferrules and is in contact with the retainer.
Example 11
As shown in fig. 5 (B), the raceway of the main thrust tapered roller bearing of the composite bearing is asymmetric, the large end face of the main thrust tapered roller is an inward concave axisymmetric curved surface, the contact part of the frame-shaped pocket of the main thrust tapered roller retainer 8 and the inward concave axisymmetric curved surface of the large end of the main thrust tapered roller is an outward convex axisymmetric curved surface, and the large end of the tapered roller is not contacted with the rims of the raceways of the front and rear ferrules and is contacted with the retainer.
Example 12
As shown in fig. 6 (a), the raceways of the main thrust tapered roller bearing of the composite bearing are symmetrical, the large end face of the main thrust tapered roller is a plane, the contact part of the frame-shaped pocket hole of the main thrust tapered roller retainer 8 and the plane of the large end of the main thrust tapered roller is an axisymmetric curved surface which is convex, the large end of the tapered roller is not contacted with the flanges of the raceways of the front ferrule and the rear ferrule, and the tapered roller is contacted with the retainer.
Example 13
As shown in fig. 6 (B), the raceways of the main thrust tapered roller bearing of the composite bearing are symmetrical, the large end face of the main thrust tapered roller is a plane, the frame-shaped pocket of the main thrust tapered roller retainer 8 is in a plane with chamfer angle with the plane contact part of the large end of the main thrust tapered roller, and the large end of the tapered roller is not contacted with the flanges of the raceways of the front ferrule and the rear ferrule and is contacted with the retainer.
Example 14
As shown in fig. 6 (C), the raceway of the main thrust tapered roller bearing of the composite bearing is asymmetric, the large end face of the main thrust tapered roller is a plane, a groove is formed in the center of the plane, the plane contact part of the frame-shaped pocket hole of the main thrust tapered roller retainer 8 and the large end plane of the main thrust tapered roller is a plane, a boss matched with the groove of the large end plane of the tapered roller is formed in the center of the plane, the large end of the tapered roller is not contacted with the flanges of the raceways of the front ferrule and the rear ferrule, and the tapered roller is in contact with the retainer in a local structure.
Example 15
As shown in fig. 6 (D), the raceway of the main thrust tapered roller bearing of the composite bearing is asymmetric, the large end face of the main thrust tapered roller is a plane, a boss is arranged at the center of the plane, the plane contact part of the frame-shaped pocket hole of the main thrust tapered roller retainer 8 and the large end plane of the main thrust tapered roller is a plane, a groove matched with the boss of the large end plane of the tapered roller is arranged at the center of the plane, the large end of the tapered roller is not contacted with the flanges of the raceways of the front ferrule and the rear ferrule, and the tapered roller is in contact with the retainer in a local structure.
Example 16
As shown in fig. 7 (a), the raceways of the main thrust tapered roller bearing of the composite bearing are symmetrical, the large end face of the main thrust tapered roller is an axisymmetric curved surface which is convex, the contact part of the frame-shaped pocket hole of the main thrust tapered roller retainer 8 and the axisymmetric curved surface which is convex at the large end of the main thrust tapered roller is a plane, the large end of the tapered roller is not contacted with the flanges of the raceways of the front ferrule and the rear ferrule, and the tapered roller is contacted with the retainer.
Example 17
As shown in fig. 7 (B), the raceway of the main thrust tapered roller bearing of the composite bearing is symmetrical, the large end face of the main thrust tapered roller is an axisymmetric curved surface which is convex, the contact part of the frame-shaped pocket of the main thrust tapered roller retainer 8 and the axisymmetric curved surface which is convex of the large end of the main thrust tapered roller is an axisymmetric curved surface which is convex, and the large end of the tapered roller is not contacted with the flanges of the raceways of the front and rear ferrules and is contacted with the retainer.
Example 18
As shown in fig. 7 (C), the raceway of the main thrust tapered roller bearing of the composite bearing is symmetrical, the large end face of the main thrust tapered roller is an axisymmetric curved surface which is convex, the contact part of the frame-shaped pocket hole of the main thrust tapered roller retainer 8 and the axisymmetric curved surface which is convex at the large end of the main thrust tapered roller is an axisymmetric curved surface which is concave, the large end of the tapered roller is not contacted with the flanges of the raceways of the front and rear ferrules, and the tapered roller is contacted with the retainer.
Example 19
As shown in fig. 7 (D), the non-raceway of the main thrust tapered roller bearing of the composite bearing is symmetrical, the large end face of the main thrust tapered roller is an axisymmetric curved surface protruding outwards, the contact part of the frame-shaped pocket of the main thrust tapered roller retainer and the axisymmetric curved surface protruding outwards of the large end of the main thrust tapered roller is an axisymmetric curved surface recessed inwards, the large end of the tapered roller is not contacted with the rims of the raceways of the front and rear ferrules, and the tapered roller is contacted with the retainer.
Claims (9)
1. The compound bearing comprises a main thrust tapered roller bearing, a centripetal cylindrical roller bearing and an auxiliary thrust tapered roller bearing, wherein the main thrust tapered roller bearing, the centripetal cylindrical roller bearing and the auxiliary thrust tapered roller bearing are composed of an outer ring, an inner ring (9), main thrust tapered rollers (7), auxiliary thrust tapered rollers (4), cylindrical rollers (2), a main thrust tapered roller retainer (8), auxiliary thrust tapered roller retainers (5), radial cylindrical roller retainers (3), oil ducts and sealing strips, the cone half angles of tapered rollers (7, 4) of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are equal to the cone half angles of cone-shaped raceways with corresponding cross sections, and cone apexes of the tapered rollers (7, 4) of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are respectively positioned on axes of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing; the geometric parameters of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing meet the pure rolling condition of the rollers, and the method is characterized in that: the outer surface of the outer ring of the composite bearing is a circular ring surface, the inner surface of the outer ring is a stepped inner ring surface, three layers are provided, the middle of the outer ring is a bottom layer step, and two layers of steps are arranged on two sides of the outer ring; the inner surface of the inner ring (9) is a circular ring surface, the outer surface of the inner ring is a ladder-shaped outer ring surface, and the inner ring is high in the middle and low in the two sides; the raceways on the outer surface of the inner ring (9) and the inner surface of the outer ring are respectively: the outer ring axial rollaway nest of the inner surface of the outer ring front and rear vertical walls, the outer ring radial rollaway nest of the bottom ladder bottom surface of the outer ring, the inner ring axial rollaway nest of the vertical wall opposite to the outer ring vertical walls outside the inner ring (9) and the inner ring radial rollaway nest of the middle boss top surface outside the inner ring (9), the outer ring axial rollaway nest of the inner ring front and rear vertical walls comprises an outer ring front axial rollaway nest and an outer ring rear axial rollaway nest, the outer ring front axial rollaway nest, the inner ring front axial rollaway nest, the main thrust tapered roller and the main thrust tapered roller retainer form the main thrust tapered roller bearing; the outer ring rear axial roller path, the inner ring rear axial roller path, the auxiliary thrust tapered roller and the auxiliary thrust tapered roller retainer form an auxiliary thrust tapered roller bearing; the outer ring radial roller path, the inner ring radial roller path, the cylindrical rollers and the radial cylindrical roller retainer form a centripetal cylindrical roller bearing, and a main thrust tapered roller bearing, a centripetal cylindrical roller bearing and an auxiliary thrust tapered roller bearing which are sequentially arranged from front to back are formed; the center points of the large end surfaces of the main thrust tapered roller (7) and the auxiliary thrust tapered roller (4) of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are respectively contacted with the center point of the top surface of a frame-shaped pocket of the main thrust tapered roller retainer (8) and the center point of the top surface of the frame-shaped pocket of the auxiliary thrust tapered roller retainer (5), and are not contacted with the flange of the outer ring, and the top surface of the frame-shaped pocket is the surface of the frame-shaped pocket contacted with the large end surface of the tapered roller; the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing also meet the physical condition of axial sliding self-locking of the tapered rollers, namely, the conditions
Wherein phi is the taper half angle of the tapered roller, mu is the sliding friction coefficient between the tapered roller and the roller path,Is the friction angle corresponding to the sliding friction coefficient mu.
2. A composite bearing according to claim 1, characterized in that: the large end faces of the main thrust tapered roller (7) and the auxiliary thrust tapered roller (4) of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are planes perpendicular to the axes of the tapered rollers or axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes, the frame pocket top faces of the main thrust tapered roller retainer (8) and the frame pocket top faces of the auxiliary thrust tapered roller retainer (5) are planes perpendicular to the axes of the tapered rollers (7, 4) respectively, axisymmetric curved surfaces taking the axes of the tapered rollers (7, 4) respectively as symmetry axes or rotating curved surfaces formed by curves which are symmetric to the axes of the tapered rollers and are in a plane perpendicular to the axes of the tapered rollers respectively and have no inflection points and rotate around the perpendicular lines which are located in the planes of the curved surfaces and perpendicularly intersect the axes of the tapered rollers, and the large end faces of the main thrust tapered roller (7) and the auxiliary thrust tapered roller (4) are in matched contact with the frame pocket top faces of the main thrust tapered roller retainer (8) and the frame pocket top faces of the auxiliary tapered roller retainer (5).
3. A composite bearing according to claim 2, wherein: the large end face center points of the main thrust tapered roller (7) and the auxiliary thrust tapered roller (4) are respectively matched and contacted with the frame-shaped pocket top face center point of the main thrust tapered roller retainer (8) and the frame-shaped pocket top face center point of the auxiliary thrust tapered roller retainer (5) in one of the following modes:
1) The large end surfaces of the main thrust tapered roller (7) and the auxiliary thrust tapered roller (4) are concave axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes, and the frame pocket top surfaces of the main thrust tapered roller retainer (8) and the frame pocket top surfaces of the auxiliary thrust tapered roller retainer (5) are convex axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes;
2) The large end surfaces of the main thrust tapered roller (7) and the auxiliary thrust tapered roller (4) are planes perpendicular to the axes of the respective tapered rollers; the top surface of the frame-shaped pocket of the main thrust tapered roller retainer (8) and the top surface of the frame-shaped pocket of the auxiliary thrust tapered roller retainer (5) are plane, convex axisymmetric curved surfaces or convex rotating curved surfaces;
3) The large end surfaces of the main thrust tapered roller (7) and the auxiliary thrust tapered roller (4) are convex axisymmetric curved surfaces taking the axes of the tapered rollers as symmetry axes; the top surface of the frame-shaped pocket of the main thrust tapered roller retainer (8) and the top surface of the frame-shaped pocket of the auxiliary thrust tapered roller retainer (5) are plane, convex axisymmetric curved surfaces, concave axisymmetric curved surfaces or rotating curved surfaces.
4. A composite bearing according to claim 2, wherein: the frame-shaped pocket of the main thrust tapered roller retainer (8) and the frame-shaped pocket of the auxiliary thrust tapered roller retainer (5) are in contact with the large end surfaces of the main thrust tapered roller (7) and the auxiliary thrust tapered roller (4), and the rotating curved surfaces are concave rotating curved surfaces or convex rotating curved surfaces.
5. A composite bearing according to claim 2, wherein: the front and rear raceways of the main thrust tapered roller bearing and the auxiliary thrust tapered roller bearing are respectively front and rear symmetrical or front and rear asymmetrical, and the front and rear symmetrical is that the included angle between the front and rear raceways and the perpendicular line of the bearing axis is the tapered half angle of the main thrust tapered roller (7) and the auxiliary thrust tapered roller (4); the front-back asymmetry is that the included angle between the front rolling path or the rear rolling path and the vertical line of the main bearing axis of the shield machine is 0 degree, and the included angle between the rear rolling path or the front rolling path and the vertical line of the main bearing axis of the shield machine is 2 times of the conical half angles of the main thrust conical roller (7) and the auxiliary thrust conical roller (4), namely, the included angle is equal to the conical angle.
6. A composite bearing according to claim 4, wherein: the outer ring is an integral outer ring or a split outer ring, and when the outer ring is the split outer ring, the outer ring is formed by relatively combining a front outer ring (6) and a rear outer ring (1).
7. A composite bearing according to claim 5, wherein: the inner ring is an integral inner ring or a split inner ring, and when the inner ring is the split inner ring, the inner ring is formed by oppositely combining a front inner ring and a rear inner ring.
8. A composite bearing according to claim 5, wherein: the outer ring radial roller path is formed by the bottom surface of a front outer ring bottom layer ladder, the bottom surface of a rear outer ring bottom layer ladder or the bottom surface of the front outer ring bottom layer ladder and the bottom surface of the rear outer ring bottom layer ladder together.
9. A composite bearing according to claim 5, characterized in that: the outer ring and the inner ring are provided with flanges or are not provided with flanges.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711271059.4A CN107830052B (en) | 2017-12-05 | 2017-12-05 | Composite bearing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711271059.4A CN107830052B (en) | 2017-12-05 | 2017-12-05 | Composite bearing |
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| CN107830052A CN107830052A (en) | 2018-03-23 |
| CN107830052B true CN107830052B (en) | 2024-02-06 |
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| CN201711271059.4A Active CN107830052B (en) | 2017-12-05 | 2017-12-05 | Composite bearing |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018218275A1 (en) * | 2018-10-25 | 2020-04-30 | Thyssenkrupp Ag | Rolling bearing arrangement and wind turbine |
| CN109838461B (en) * | 2019-03-20 | 2020-12-11 | 江苏持华轴承有限公司 | Self-lubricating high-speed bearing |
| CN113339411B (en) * | 2021-06-09 | 2022-12-16 | 中国铁建重工集团股份有限公司 | Main bearing of heading machine, axial retainer and radial retainer thereof |
| CN114412918B (en) * | 2022-01-25 | 2023-10-31 | 中国铁建重工集团股份有限公司 | Main bearing of heading machine and assembly method thereof |
| CN114483776B (en) * | 2022-01-28 | 2023-10-24 | 中国铁建重工集团股份有限公司 | Main bearing of heading machine and assembly method thereof |
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| CN1302962A (en) * | 2001-01-05 | 2001-07-11 | 陈世业 | Cylindrical roller with symmetrical dual cones and its application in bearing |
| JP2008064230A (en) * | 2006-09-08 | 2008-03-21 | Nsk Ltd | Thrust bearing |
| CN206545650U (en) * | 2017-03-13 | 2017-10-10 | 浙江双飞无油轴承股份有限公司 | A kind of tandem composite bearing |
| CN207762129U (en) * | 2017-12-05 | 2018-08-24 | 大连交通大学 | A kind of composite bearing |
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| CN1302962A (en) * | 2001-01-05 | 2001-07-11 | 陈世业 | Cylindrical roller with symmetrical dual cones and its application in bearing |
| JP2008064230A (en) * | 2006-09-08 | 2008-03-21 | Nsk Ltd | Thrust bearing |
| CN206545650U (en) * | 2017-03-13 | 2017-10-10 | 浙江双飞无油轴承股份有限公司 | A kind of tandem composite bearing |
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| CN107830052A (en) | 2018-03-23 |
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