CN113738764A - Low-noise retainer with thermal-force double negative superstructure - Google Patents
Low-noise retainer with thermal-force double negative superstructure Download PDFInfo
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- CN113738764A CN113738764A CN202111007635.0A CN202111007635A CN113738764A CN 113738764 A CN113738764 A CN 113738764A CN 202111007635 A CN202111007635 A CN 202111007635A CN 113738764 A CN113738764 A CN 113738764A
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- Prior art keywords
- superstructure
- negative
- retainer
- thermal
- thermal expansion
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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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
- F16C33/3831—Ball cages with hybrid structure, i.e. with parts made of distinct materials
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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
- F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
- F16C19/525—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to temperature and heat, e.g. insulation
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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
- F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
- F16C19/527—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to vibration and noise
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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
- F16C33/38—Ball cages
- F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
- F16C33/3862—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages comprising two annular parts joined together
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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
- F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
- F16C33/4641—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages comprising two annular parts joined together
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
A low-noise retainer with a thermal-force double negative superstructure is composed of two parts, namely a retainer inner layer made of traditional materials, and a thermal-force double negative controllable superstructure unit prepared on a retainer guide surface and a pocket hole surface, wherein the superstructure unit is formed by carrying out cell combination and spatial topology on a negative thermal expansion superstructure and a negative Poisson ratio superstructure; when the temperature of the service environment of the bearing rises, the superstructure unit has thermal negativity, and is subjected to thermal contraction along the radial direction, so that the guide clearance of the retainer is increased to a certain extent, and the phenomenon that the guide clearance is reduced due to the thermal effect can be inhibited; when the rotating speed of the bearing rises, the superstructure unit has negative force, and is expanded in a tensile manner along the circumferential direction, so that the pocket gap is reduced, and the problem of the increase of the pocket gap caused by the centrifugal effect is solved to a certain extent; the invention can realize the adjustment of the guide clearance and the pocket clearance of the retainer in the process of the change of the cross-rotating speed and the large temperature difference.
Description
Technical Field
The present invention relates to a bearing assembly, and more particularly to a low noise cage having a thermal-force double negative superstructure.
Background
The high-end bearing technology route map facing the technical prospect of the 2030 manufacturing industry in China indicates that low noise, high precision, high rotating speed and intellectualization become four major core technologies of high-performance bearings in the next decade. Aiming at service occasions such as military equipment, the field of civil household appliances and the like, low noise becomes a first index for evaluating the performance of the bearing.
Research shows that on the basis of stable operation of the retainer, bearing noise can be effectively reduced by reducing the pocket clearance between the retainer and the rolling body and increasing the guide clearance between the retainer and the guide surface. However, in the actual operation process of the bearing, the cage guide clearance is reduced, the pocket clearance is increased, the bearing noise is gradually increased, and at the moment, the cage guide clearance and the pocket clearance are opposite to the ideal change law.
With the increasing demand of the manufacturing industry for the service performance of the bearing, the low noise performance of the bearing is concerned more and more. For example, the SKF group develops the low-noise retainer VG275, which can reduce the bearing noise to some extent at low rotation speed, but as the bearing operation rotation speed increases, the noise reduction capability of the VG275 retainer gradually loses. The investigation result shows that the cage is subjected to the dual force field of centrifugal force and thermal expansion, the deformation coefficients of the guide clearance and the pocket clearance are gradually increased, and finally the low-noise performance of the bearing is influenced. Meanwhile, in the service process of the bearing, the coupling influence of the centrifugal effect and the thermal effect on the clearance of the retainer is further highlighted due to extreme and complex working conditions. Therefore, how to realize effective regulation and control of the guide clearance and the pocket clearance of the retainer in the process of changing across the rotating speed and large temperature difference is the key for improving the low noise performance of the bearing under the variable working condition.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a low-noise retainer having a heat-force double-negative superstructure, which can utilize the thermal contraction (thermal negativity) characteristic and the tensile expansion (force negativity) characteristic of the superstructure unit different from the conventional material heat-force property during the change process of the cross-rotational speed and the large temperature difference, and can adjust and control the guide clearance and the pocket clearance of the retainer when the bearing operates, thereby effectively improving the low-noise performance of the bearing.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a low-noise retainer with a thermal-force double negative superstructure is characterized in that thermal-force double negative controllable superstructure units 3 are prepared on the guide surface and pocket hole surface of a retainer 1;
the superstructure unit 3 is constructed by carrying out cell combination on a negative thermal expansion superstructure 4 and a negative Poisson ratio superstructure 5 in a space topological mode, and the superstructure unit 3 is manufactured in a mode including but not limited to 3D printing;
the negative thermal expansion superstructure 4 comprises a bi-material rectangular pyramid structure made of two materials with different thermal expansion coefficients, wherein the base side is made of a high thermal expansion coefficient material and the side is made of a low thermal expansion coefficient material.
The negative poisson's ratio superstructure 5 comprises a roof-type structure fabricated from a low coefficient of thermal expansion material in the negative thermal expansion superstructure 4.
The cell combination is constructed in a space topology mode, and specifically comprises the following steps: the negative thermal expansion superstructure 4 and the negative Poisson ratio superstructure 5 realize cell combination at a point O' on a force action line of the negative Poisson ratio superstructure 5 in a connection mode, and then carry out space topology at a space topology point O in a space rotation mode, so that the superstructure unit 3 is constructed.
The thermal deformation temperature of the low thermal expansion coefficient material exceeds 150 ℃, and the thermal expansion coefficient is less than 50 multiplied by 10-6K-1Including PEEK materials.
The thermal deformation temperature of the material with high thermal expansion coefficient is not more than 150 ℃, and the thermal expansion coefficient is not less than 50 multiplied by 10-6K-1Including PTFE materials.
Compared with the prior art, the invention firstly utilizes a heat-force double negative superstructure to realize the regulation and control of the guide clearance of the retainer and the clearance of the pocket: firstly, preparing a heat-force double-negative controllable superstructure unit on a guide surface and a pocket surface of a retainer; secondly, regulating and controlling a guide gap and a pocket gap of the retainer by utilizing the thermal contraction characteristic and the tension expansion characteristic of the superstructure unit; according to the invention, the superstructure unit 3 is manufactured on the guide surface and the pocket surface of the retainer, so that the guide clearance and the pocket clearance of the retainer can be regulated and controlled, and the problem of effectively regulating and controlling the guide clearance and the pocket clearance of the retainer in the process of over-rotation speed and large temperature difference change is solved.
Drawings
Fig. 1 is a schematic view of a cage with a superstructure.
Fig. 2 is a deformation schematic diagram of a common retainer and a retainer with a superstructure under the action of centrifugal and thermal effects.
Fig. 3 is a schematic diagram of a thermal-force double negative controllable superstructure cell.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a low-noise holder having a thermo-force double negative superstructure, the holder is composed of two parts, a holder inner layer 2 made of a conventional material, and a thermo-force double negative controllable superstructure unit 3 prepared on a guide surface and a pocket surface of the holder 1; the overall size of the cage remains unchanged.
Referring to fig. 2, the conventional cage is thermally expanded in the radial direction by the thermal effect and the guide gap is reduced, whereas the superstructure unit 3 having the surface layer of the cage guide surface of the superstructure has a thermal negativity and is thermally contracted in the radial direction to increase the cage guide gap to some extent, and the phenomenon of the reduction of the guide gap caused by the thermal effect can be suppressed.
Referring to fig. 2, the common cage is centrifugally expanded in the circumferential direction under the centrifugal effect, and the pocket gap is increased because the superstructure unit 3 on the surface layer of the cage pocket surface with the superstructure has negative force, and is expanded in tension in the circumferential direction, so that the pocket gap is reduced, and the problem of the increase of the pocket gap caused by the centrifugal effect is solved to a certain extent.
Referring to fig. 3, the superstructure unit 3 is constructed by cell combination of a negative thermal expansion superstructure 4 and a negative poisson's ratio superstructure 5 and adopting a space topology method, and can simultaneously have thermal contraction characteristics (thermal negativity) and tension expansion characteristics (force negativity), and the superstructure unit 3 is manufactured by a method including, but not limited to, 3D printing.
The cell combination is constructed in a space topology mode, and specifically comprises the following steps: the negative thermal expansion superstructure 4 and the negative Poisson ratio superstructure 5 realize cell combination at a point O' on a force action line of the negative Poisson ratio superstructure 5 in a connection mode, and then carry out space topology at a space topology point O in a space rotation mode, so that the superstructure unit 3 is constructed.
Referring to fig. 3, the negative thermal expansion superstructure 4 includes, but is not limited to, a bi-material rectangular pyramid structure made of two materials having different thermal expansion coefficients, wherein the base of the superstructure is made of a high thermal expansion coefficient material and the side edges are made of a low thermal expansion material, and the base of the superstructure thermally deforms more than the side edges at an elevated temperature, resulting in a reduced height.
Referring to fig. 3, the negative poisson's ratio superstructure 5 includes, but is not limited to, a rooftop type structure, made of a low coefficient of thermal expansion material in a negative thermal expansion superstructure 4, which expands when placed in tension, perpendicular to the direction of tension.
The thermal deformation temperature of the low thermal expansion coefficient material exceeds 150 ℃, and the thermal expansion coefficient is less than 50 multiplied by 10-6K-1Including PEEK materials.
The thermal deformation temperature of the material with high thermal expansion coefficient is not more than 150 ℃, and the thermal expansion coefficient is not less than 50 multiplied by 10-6K-1Including PTFE materials.
The working principle of the invention is as follows: by designing material combinations with different thermal expansion coefficients, the single cell structure can be subjected to thermal contraction, and similarly, through different geometrical structure topologies, the single cell structure can also be subjected to tensile expansion. By performing cell combination and space topology on the two types of unit cell structures, a superstructure space body with double negative heat-force can be obtained. On the basis of the inner layer of the retainer made of traditional materials, the heat-force double-negative type superstructure unit is prepared on the guide surface and the pocket surface of the retainer, when the ambient temperature rises, the problem that the guide clearance is reduced due to the thermal expansion of the inner layer of the retainer is solved by utilizing the heat negativity of the superstructure unit on the surface layer of the guide surface of the retainer, and when the rotating speed rises, the problem that the pocket clearance is increased due to the centrifugal expansion of the inner layer of the retainer is solved by utilizing the force negativity of the superstructure unit on the surface layer of the pocket surface of the retainer; and finally, the guide clearance of the retainer and the clearance of the pocket are effectively regulated and controlled.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A low-noise retainer with a thermal-force double negative superstructure is characterized in that thermal-force double negative controllable superstructure units (3) are prepared on the guide surface and pocket hole surface of the retainer (1);
the superstructure unit (3) is constructed by cell combination of a negative thermal expansion superstructure (4) and a negative Poisson ratio superstructure (5) in a spatial topological manner, and the superstructure unit (3) is manufactured by a manner including but not limited to 3D printing.
2. A low noise cage with a thermo-force double negative superstructure according to claim 1, characterized in that said negative thermal expansion superstructure (4) comprises a bi-material rectangular pyramid structure made of two materials with different thermal expansion coefficients, wherein the bottom side is made of a high thermal expansion coefficient material and the side sides are made of a low thermal expansion coefficient material.
3. A low noise cage with a thermo-force double negative superstructure according to claim 2, characterized in that the negative poisson's ratio superstructure (5) comprises a roof-type structure, made of a low thermal expansion coefficient material in the negative thermal expansion superstructure (4).
4. The low noise cage with a thermally-actuated double negative superstructure of claim 2, wherein said low CTE material has a heat distortion temperature in excess of 150 ℃ and a CTE less than 50 x 10-6K-1Including PEEK materials.
5. The low noise cage with a thermally-actuated double negative superstructure of claim 2, wherein said high CTE material has a heat distortion temperature of not more than 150 ℃ and a CTE of not less than 50 x 10-6K-1Including PTFE materials.
6. The low noise cage with a thermally-actuated double negative superstructure according to claim 1, wherein said cells are assembled and constructed using a spatial topology, in particular: the negative thermal expansion superstructure (4) and the negative Poisson ratio superstructure (5) realize cell combination at a point O' on a force action line of the negative Poisson ratio superstructure (5) in a connection mode, and then carry out space topology at a space topology point O in a space rotation mode, so that the superstructure unit (3) is constructed.
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|---|---|---|---|
| CN202111007635.0A CN113738764B (en) | 2021-08-30 | 2021-08-30 | Low-noise retainer with thermal-force double negative superstructure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111007635.0A CN113738764B (en) | 2021-08-30 | 2021-08-30 | Low-noise retainer with thermal-force double negative superstructure |
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| CN113738764A true CN113738764A (en) | 2021-12-03 |
| CN113738764B CN113738764B (en) | 2022-10-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114512287A (en) * | 2022-01-19 | 2022-05-17 | 浙江大学 | Topological insulating device with negative thermal expansion |
| WO2023137615A1 (en) * | 2022-01-19 | 2023-07-27 | 浙江大学 | Topological insulation device having negative thermal expansion |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2023137615A1 (en) * | 2022-01-19 | 2023-07-27 | 浙江大学 | Topological insulation device having negative thermal expansion |
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| CN113738764B (en) | 2022-10-28 |
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