CN108612757B - Active magnetorheological fluid hydrostatic bearing - Google Patents
Active magnetorheological fluid hydrostatic bearing Download PDFInfo
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- CN108612757B CN108612757B CN201810771729.7A CN201810771729A CN108612757B CN 108612757 B CN108612757 B CN 108612757B CN 201810771729 A CN201810771729 A CN 201810771729A CN 108612757 B CN108612757 B CN 108612757B
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- shaft
- bearing
- magnetorheological fluid
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- shaft sleeve
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
- F16C32/0633—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being retained in a gap
- F16C32/0637—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being retained in a gap by a magnetic field, e.g. ferrofluid bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses an active magnetorheological fluid hydrostatic bearing which comprises a stepped shaft, a first shaft end retainer ring, a shaft sleeve, a second shaft end retainer ring, a permanent magnet, four enamelled coils, a first framework seal, a second framework seal, a first axial nut and a second axial nut, wherein the stepped shaft is arranged on the stepped shaft; the stepped shaft is provided with five shaft necks in a machining mode; the shaft sleeve is a revolving body, four radial oil inlet holes are uniformly processed at the axial center of the shaft sleeve along the circumference of the revolving body, and an inward convex static pressure supporting cavity is arranged at each radial oil inlet hole on the inner circumference of the revolving body; and an enameled coil is glued and fixed at the oil sealing edge around each static pressure supporting cavity. The invention adopts the magnetorheological fluid as the lubricating medium, the flow resistance is increased when the magnetorheological fluid flows through the magnetic field generated between the permanent magnet and the electromagnet, the supporting pressure of the supporting cavity is forced to be increased, and the bearing capacity of the bearing is effectively improved, so that the invention has the characteristics of high bearing capacity and high rigidity.
Description
Field of the invention
The invention relates to the field of design of sliding bearings, in particular to an active type magnetorheological fluid hydrostatic bearing.
Background
The hydrostatic bearing can continuously generate heat during working, so that the temperature of the bearing is continuously increased. The viscosity of the oil is gradually reduced due to the temperature rise of the oil, so that the pressure of the supporting cavity is reduced, and the load capacity of the bearing is reduced.
Disclosure of Invention
According to the problems existing in the prior art, the invention provides an active type magnetorheological hydrostatic bearing. The invention adopts the magnetorheological fluid as the lubricating medium, the flow resistance is increased when the magnetorheological fluid flows through the magnetic field generated between the permanent magnet and the electromagnet, the supporting pressure of the supporting cavity is forced to be increased, and the bearing capacity of the bearing is effectively improved, so that the invention has the characteristics of high bearing capacity and high rigidity.
In order to solve the technical problems, the invention is realized by the following technical scheme:
an active magnetorheological fluid hydrostatic bearing comprises a stepped shaft, a first shaft end retainer ring, a shaft sleeve, a second shaft end retainer ring, a permanent magnet, four enameled coils, a first framework seal, a second framework seal, a first axial nut and a second axial nut;
the stepped shaft is provided with five shaft necks which are a first shaft section, a second shaft section, a third shaft section, a fourth shaft section and a fifth shaft section from left to right in sequence, the third shaft section is arranged in the middle, and the first shaft section, the fifth shaft section, the second shaft section and the fourth shaft section are respectively symmetrical to each other at two sides of the third shaft section; a permanent magnet is embedded in a shaft neck of the third shaft section, and threads are machined on the shaft neck of the second shaft section and the shaft neck of the fourth shaft section; the first axial nut and the second axial nut are respectively matched with the threads on the second shaft section and the fourth shaft section to axially fix the permanent magnet;
the shaft sleeve is a revolving body, four radial oil inlet holes are uniformly processed at the axial center of the shaft sleeve along the circumference of the revolving body, and an inward convex static pressure supporting cavity is arranged at each radial oil inlet hole on the inner circumference of the revolving body; an enameled coil is glued and fixed at an oil sealing edge around each static pressure supporting cavity, and two radial oil return holes are processed at two ends of the circumference of a revolving body of the shaft sleeve; four mounting threaded holes are uniformly and axially processed on two end faces of the shaft sleeve;
the first shaft end retainer ring is a revolving body, and four mounting through holes are uniformly distributed and processed on the end surface of the revolving body of the first shaft end retainer ring and correspond to four mounting threaded holes on the left end surface of the revolving body of the shaft sleeve; the second shaft end retaining ring structure is symmetrical and identical to the first shaft end retaining ring structure;
the shaft sleeve is sleeved on the stepped shaft in the middle, the third shaft section of the stepped shaft is in clearance fit with the shaft sleeve, and the clearance is 30 micrometers; the enameled coils are glued on the four oil sealing edges of the static pressure supporting cavities on the shaft sleeve, after the enameled coils are electrified, the oil sealing edges of the static pressure supporting cavities are magnetized in the radial direction, the outer side is an S pole after the static pressure supporting cavities are magnetized, and the inner side is an N pole; permanent magnets are embedded and fixed on shaft necks of a third shaft section of the stepped shaft, the outer side of each permanent magnet is an S pole, the inner side of each permanent magnet is an N pole, and the permanent magnets and magnetic poles of oil sealing edges of the static pressure bearing cavities magnetized by the enameled coils are mutually grouped to form a stable magnetic field; the first framework seal is embedded between the shaft sleeve and the first shaft section of the stepped shaft at the left end of the shaft sleeve, and the second framework seal is embedded between the shaft sleeve and the fifth shaft section of the stepped shaft at the right end of the shaft sleeve, so that axial leakage of oil is prevented; the first shaft end retaining ring is fastened on the left end face of the shaft sleeve through a mounting through hole; and the second shaft end retaining ring is fastened on the right end face of the shaft sleeve through a mounting through hole.
Due to the adoption of the technical scheme, compared with the prior art, the active type magnetorheological fluid hydrostatic bearing provided by the invention has the following beneficial effects:
compared with the common hydrostatic bearing, the invention adopts magnetorheological fluid as a lubricating medium; the oil sealing edges of the four static pressure supporting cavities in the shaft sleeve are glued and fixed with enameled coils, and the oil sealing edges of the static pressure supporting cavities are magnetized after the enameled coils are electrified, so that the inner sides of the magnetized oil sealing edges are N poles, and the outer sides of the magnetized oil sealing edges are S poles; permanent magnets are embedded on the stepped shaft, the outer side of the stepped shaft is an S pole, the inner side of the stepped shaft is an N pole, and the permanent magnets and magnetic poles of oil sealing edges of the static pressure supporting cavity magnetized by the enameled coils are mutually grouped to form a stable magnetic field; when the magnetorheological fluid flows through the magnetic field, the viscosity is increased, the liquid resistance is increased, and the pressure, the bearing capacity and the static rigidity of the oil cavity are improved. Meanwhile, the acted magnetorheological fluid passes through the enameled coil, so that the active type magnetorheological fluid hydrostatic bearing is cooled, and the temperature rise and the thermal deformation are reduced.
Drawings
FIG. 1 is a general schematic diagram of an active type magnetorheological hydrostatic bearing;
FIG. 2 is a cross-sectional view of an active magnetorheological hydrostatic bearing;
FIG. 3 is an enlarged partial view of the enameled coil and permanent magnet of FIG. 2;
FIG. 4 is a top view of the bushing;
FIG. 5 is a cross-sectional view of the bushing A-A of FIG. 4;
FIG. 6 is a cross-sectional view of the sleeve of FIG. 4 taken along plane B-B;
FIG. 7 is a side view of the sleeve shaft;
fig. 8 (a) is a front view of the first shaft end retainer ring; (b) is a sectional view of the A-A surface of the first shaft end retainer ring.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
the embodiment of the invention relates to an active magnetorheological fluid hydrostatic bearing, which comprises the following steps: as shown in fig. 1 and 2, the shaft comprises a stepped shaft 4, a first shaft end retainer 3, a shaft sleeve 1, a second shaft end retainer 11, a permanent magnet 15, four enameled coils 21, a first framework seal 19, a second framework seal 8, a first axial nut 20 and a second axial nut 23.
The stepped shaft 4 is provided with five shaft necks which are a first shaft section 18, a second shaft section 17, a third shaft section 13, a fourth shaft section 10 and a fifth shaft section 9 from left to right in sequence; the diameters of the first shaft section 18 and the fifth shaft section 9 are both 40mm, and the lengths of the first shaft section and the fifth shaft section are both 50 mm; the diameters of the second shaft section 17 and the fourth shaft section 10 are both 42mm, and the lengths are both 5 mm; the diameter of the third shaft section 13 is 45mm and the length is 86 mm; the third shaft section 13 is centered, and the first shaft section 18, the fifth shaft section 9, the second shaft section 17 and the fourth shaft section 10 are respectively symmetrical to each other at two sides of the third shaft section 13; a permanent magnet 15 is embedded in a shaft neck of the third shaft section 13, and threads are machined on the shaft neck of the second shaft section 17 and the shaft neck of the fourth shaft section 10; the first axial nut 20 and the second axial nut 23 are respectively matched with the threads on the second shaft section 17 and the fourth shaft section 10 to axially fix the permanent magnet 15; the first and second axial nuts 20 and 23 each have an outer diameter of 47mm, an inner diameter of 42mm and a thickness of 4 mm.
As shown in fig. 4 to 7, the shaft sleeve 1 is a rotary body, and has an outer diameter of 84mm, an inner diameter of 64mm, and a total length of 126 mm; four radial oil inlet holes 14 are uniformly processed at the axial center along the circumference of the revolving body, and the diameter of each radial oil inlet hole is 8 mm; an inward convex static pressure supporting cavity 22 is arranged at each radial oil inlet hole 14 on the inner circumference of the revolving body, the inner diameter of the static pressure supporting cavity 22 is 50mm, the length of a projected rectangle of the inner edge is 56mm, the width is 21mm, and the thickness is 3 mm; an enameled coil 21 is glued and fixed at an oil sealing edge around each static pressure supporting cavity 22, two radial oil return holes 16 and 12 are processed at two ends of the circumference of the revolving body of the shaft sleeve 1, and the diameters of the radial oil return holes are 8 mm; four mounting threaded holes 24 are uniformly and axially processed on two end faces of the shaft sleeve 1, and the diameter of each hole is 6 mm.
As shown in fig. 8, the first shaft end retainer ring 3 is a solid of revolution, and has an outer diameter of 79mm, an inner diameter of 46mm, and a thickness of 3 mm; four mounting through holes 25 are uniformly machined in the end face of the revolving body of the first shaft end retainer ring 3 and correspond to four mounting threaded holes 24 in the left end face of the revolving body of the shaft sleeve 1; the structural size of the second shaft end retainer ring 11 is symmetrical and the same as that of the first shaft end retainer ring 3.
As shown in fig. 2 and 3, the shaft sleeve 1 is centrally sleeved on the stepped shaft 4, and the third shaft section 13 of the stepped shaft 4 is in clearance fit with the shaft sleeve 1, and the clearance is 30 μm; the enameled coils 21 are glued on the four oil sealing edges of the static pressure supporting cavities 22 on the shaft sleeve 1, after the enameled coils are electrified, the oil sealing edges of the static pressure supporting cavities 22 are magnetized in the radial direction, the outer side is an S pole after the static pressure supporting cavities are magnetized, and the inner side is an N pole; the permanent magnet 15 is embedded and fixed on the shaft neck of the third shaft section 13 of the stepped shaft 4, the outer side is an S pole, the inner side is an N pole, and the permanent magnet and the magnetic pole of the oil sealing edge of the static pressure bearing cavity 22 magnetized by the enameled coil 21 are mutually combined to form a stable magnetic field; the first framework seal 19 is embedded between the shaft sleeve 1 and the first shaft section 18 of the stepped shaft 4 at the left end of the shaft sleeve 1, and the second framework seal 8 is embedded between the shaft sleeve 1 and the fifth shaft section 9 of the stepped shaft 4 at the right end of the shaft sleeve 1, so that axial leakage of oil is prevented; the first shaft end retainer ring 3 is fastened on four mounting threaded holes 24 on the left end surface of the shaft sleeve 1 through four mounting through holes 25 by screws; similarly, the second shaft end retainer ring 11 is also screwed to four mounting threaded holes in the right end surface of the sleeve 1 through four mounting through holes; as shown in fig. 1, the oil nipples 2 are installed at the inlets of four radial oil inlet holes 14 on the shaft sleeve 1, and the oil nipples 7 and 6 are installed at the outlets of two radial oil outlet holes 12 and 16, respectively.
When the bearing works, magnetorheological fluid flows into the bearing from the four radial oil inlet holes 14 on the shaft sleeve 1 and enters the four static pressure supporting cavities 22 to form pressure to support the stepped shaft 4. Then, the magnetorheological fluid passes through a magnetic field gap between the oil sealing edge of the hydrostatic bearing cavity 22 and the stepped shaft 4. After four enameled coils 21 which are glued at the oil sealing sides of four static pressure supporting cavities 22 in the shaft sleeve 1 are electrified, the oil sealing sides of the four static pressure supporting cavities 22 are magnetized in the radial direction, the inner side of the magnetized oil sealing side is an N pole, the outer side of the magnetized oil sealing side is an S pole, a permanent magnet 15 which is embedded and fixed on a third shaft section 18 of the stepped shaft 4 is an S pole, the inner side of the stepped shaft is an N pole, and the magnetized oil sealing side of the static pressure supporting cavities 22 and the magnetic poles of the oil sealing side of the static pressure supporting cavities 22 are mutually grouped to form a stable magnetic field. When the magnetorheological fluid flows through the oil sealing edge gap filled with the magnetic field, the particles of the magnetorheological fluid are changed from disordered distribution to regular distribution under the action of the magnetic field, the particles are arranged in a chain bundle shape along the direction of the magnetic field to limit the flow of the magnetorheological fluid, the flow resistance of the magnetorheological fluid is increased, the pressure in the bearing cavity 22 is increased, and the bearing capacity of the bearing is improved. And finally, after the magnetorheological fluid flows out, the magnetorheological fluid is restored to the previous state without the influence of a magnetic field, the flow resistance is reduced, and the magnetorheological fluid passes through the enameled coil 21 and then flows out of the bearing through the two radial oil outlet holes 12 and 16 at the two ends of the shaft sleeve 1. And further cooling the active magnetorheological fluid hydrostatic bearing, and reducing temperature rise and thermal deformation.
When loading, the oil inlet pressure of the oil inlet hole 14 of the shaft sleeve 1 and the current of the enameled coil 21 can be changed so as to adjust the hydraulic supporting force and the magnetic field intensity of the bearing and realize fine adjustment on the position of the shaft 4 of the stepped shaft 4.
Claims (1)
1. An active type magnetorheological fluid hydrostatic bearing is characterized in that: the bearing comprises a stepped shaft, a first shaft end retainer ring, a shaft sleeve, a second shaft end retainer ring, a permanent magnet, four enameled coils, a first framework seal, a second framework seal, a first axial nut and a second axial nut;
the stepped shaft is provided with five shaft necks which are a first shaft section, a second shaft section, a third shaft section, a fourth shaft section and a fifth shaft section from left to right in sequence, the third shaft section is centered, the first shaft section and the fifth shaft section are mutually symmetrical on two sides of the third shaft section, and the second shaft section and the fourth shaft section are mutually symmetrical on two sides of the third shaft section; a permanent magnet is embedded in a shaft neck of the third shaft section, and threads are machined on the shaft neck of the second shaft section and the shaft neck of the fourth shaft section; the first axial nut and the second axial nut are respectively matched with the threads on the second shaft section and the fourth shaft section to axially fix the permanent magnet;
the shaft sleeve is a revolving body, four radial oil inlet holes are uniformly processed at the axial center of the shaft sleeve along the circumference of the revolving body, and an inward convex static pressure supporting cavity is arranged at each radial oil inlet hole on the inner circumference of the revolving body; an enameled coil is glued and fixed at an oil sealing edge around each static pressure supporting cavity, and two radial oil return holes are processed at two ends of the circumference of a revolving body of the shaft sleeve; four mounting threaded holes are uniformly and axially processed on two end faces of the shaft sleeve;
the first shaft end retainer ring is a revolving body, and four mounting through holes are uniformly distributed and processed on the end surface of the revolving body of the first shaft end retainer ring and correspond to four mounting threaded holes on the left end surface of the revolving body of the shaft sleeve; the second shaft end retaining ring structure is symmetrical and identical to the first shaft end retaining ring structure;
the shaft sleeve is sleeved on the stepped shaft in the middle, the third shaft section of the stepped shaft is in clearance fit with the shaft sleeve, and the clearance is 30 micrometers; the enameled coils are glued on the four oil sealing edges of the static pressure supporting cavities on the shaft sleeve, after the enameled coils are electrified, the oil sealing edges of the static pressure supporting cavities are magnetized in the radial direction, the outer side is an S pole after the static pressure supporting cavities are magnetized, and the inner side is an N pole; permanent magnets are embedded and fixed on shaft necks of a third shaft section of the stepped shaft, the outer side of each permanent magnet is an S pole, the inner side of each permanent magnet is an N pole, and the permanent magnets and magnetic poles of oil sealing edges of the static pressure bearing cavities magnetized by the enameled coils are mutually grouped to form a stable magnetic field; the first framework seal is embedded between the shaft sleeve and the first shaft section of the stepped shaft at the left end of the shaft sleeve, and the second framework seal is embedded between the shaft sleeve and the fifth shaft section of the stepped shaft at the right end of the shaft sleeve, so that axial leakage of oil is prevented; the first shaft end retaining ring is fastened on the left end face of the shaft sleeve through a mounting through hole; the second shaft end retaining ring is fastened on the right end face of the shaft sleeve through a mounting through hole; magnetorheological fluid is used as a lubricating medium, and when the bearing works, the magnetorheological fluid flows into the bearing from four radial oil inlet holes on the shaft sleeve and enters four static pressure bearing cavities to form pressure to support the stepped shaft; then, when the magnetorheological fluid passes through an oil sealing edge gap filled with a magnetic field between an oil sealing edge of the static pressure bearing cavity and the stepped shaft, particles of the magnetorheological fluid are changed from disordered distribution to regular distribution under the action of the magnetic field, the particles are in chain bundle arrangement along the direction of the magnetic field to limit the flow of the magnetorheological fluid, the flow resistance of the magnetorheological fluid is increased, the pressure in the bearing cavity is increased, and the bearing capacity of the bearing is improved; finally, after the magnetorheological fluid flows out, the magnetorheological fluid is restored to the previous state without the influence of a magnetic field, the flow resistance is reduced, and the magnetorheological fluid passes through the enameled coil and then passes through two radial oil outlet holes at two ends of the shaft sleeve and flows out of the bearing; further cooling the active magnetorheological fluid hydrostatic bearing, and reducing temperature rise and thermal deformation; when the bearing is loaded, the oil inlet pressure of an oil inlet hole of the shaft sleeve and the current of the enameled coil can be changed, so that the hydraulic supporting force and the magnetic field intensity of the bearing are adjusted, and the step shaft is finely adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771729.7A CN108612757B (en) | 2018-07-13 | 2018-07-13 | Active magnetorheological fluid hydrostatic bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771729.7A CN108612757B (en) | 2018-07-13 | 2018-07-13 | Active magnetorheological fluid hydrostatic bearing |
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| Publication Number | Publication Date |
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| CN108612757A CN108612757A (en) | 2018-10-02 |
| CN108612757B true CN108612757B (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810771729.7A Active CN108612757B (en) | 2018-07-13 | 2018-07-13 | Active magnetorheological fluid hydrostatic bearing |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110259827B (en) * | 2019-06-24 | 2020-11-10 | 大连贝林轴承仪器有限公司 | Oil static pressure main shaft system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4809354A (en) * | 1986-12-10 | 1989-02-28 | Nippon Seiko Kabushiki Kaisha | Hydrostatic bearing utilizing a ferromagnetic fluid |
| JPH09303397A (en) * | 1996-05-17 | 1997-11-25 | Nippon Seiko Kk | Spindle device |
| CN204099410U (en) * | 2014-10-12 | 2015-01-14 | 张广 | A kind of roller bearing with integrated damper based on magnetic rheology effect |
| JP2015171165A (en) * | 2014-03-04 | 2015-09-28 | 国立大学法人東京工業大学 | Motor and motor system |
| CN106640966A (en) * | 2017-02-17 | 2017-05-10 | 燕山大学 | Magnetic fluid double suspension driving and driven radial bearing |
| CN107165937A (en) * | 2017-04-21 | 2017-09-15 | 燕山大学 | A kind of journal bearing of the dual supporting of electromagnetism static pressure |
| CN108180222A (en) * | 2017-12-29 | 2018-06-19 | 上海应用技术大学 | Magnetic fluid sliding bearing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130107506A (en) * | 2012-03-22 | 2013-10-02 | 삼성전기주식회사 | Fluid hydrodynamic bearing and spindle motor having the same |
-
2018
- 2018-07-13 CN CN201810771729.7A patent/CN108612757B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4809354A (en) * | 1986-12-10 | 1989-02-28 | Nippon Seiko Kabushiki Kaisha | Hydrostatic bearing utilizing a ferromagnetic fluid |
| JPH09303397A (en) * | 1996-05-17 | 1997-11-25 | Nippon Seiko Kk | Spindle device |
| JP2015171165A (en) * | 2014-03-04 | 2015-09-28 | 国立大学法人東京工業大学 | Motor and motor system |
| CN204099410U (en) * | 2014-10-12 | 2015-01-14 | 张广 | A kind of roller bearing with integrated damper based on magnetic rheology effect |
| CN106640966A (en) * | 2017-02-17 | 2017-05-10 | 燕山大学 | Magnetic fluid double suspension driving and driven radial bearing |
| CN107165937A (en) * | 2017-04-21 | 2017-09-15 | 燕山大学 | A kind of journal bearing of the dual supporting of electromagnetism static pressure |
| CN108180222A (en) * | 2017-12-29 | 2018-06-19 | 上海应用技术大学 | Magnetic fluid sliding bearing |
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| CN108612757A (en) | 2018-10-02 |
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