CN103982539B - High-speed ball bearing with integrated monitoring assembly - Google Patents
High-speed ball bearing with integrated monitoring assembly Download PDFInfo
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- CN103982539B CN103982539B CN201410233028.XA CN201410233028A CN103982539B CN 103982539 B CN103982539 B CN 103982539B CN 201410233028 A CN201410233028 A CN 201410233028A CN 103982539 B CN103982539 B CN 103982539B
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- retainer
- disk body
- magnet
- sensor
- radius
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 230000005284 excitation Effects 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 229910000906 Bronze Inorganic materials 0.000 claims description 5
- 239000010974 bronze Substances 0.000 claims description 5
- 230000010354 integration Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000416536 Euproctis pseudoconspersa Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002964 excitative effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- BULVZWIRKLYCBC-UHFFFAOYSA-N phorate Chemical compound CCOP(=S)(OCC)SCSCC BULVZWIRKLYCBC-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
The invention relates to a high-speed ball bearing with an integrated monitoring assembly, and belongs to the technical field of bearings and monitoring thereof. A ball cavity, blind holes and stepped holes are formed in a retainer; the retainer is riveted with excitation magnets embedded into the stepped holes through rivets; stepped shafts are arranged at two ends of an inner ring, and the stepped holes are formed in two ends of an outer ring; a disk body is arranged on the stepped shafts or in the stepped holes; a sensor is mounted on the side wall of a ring slot of the disk body; a circuit board and a cover board are respectively arranged on two sides of the disk body; an energy harvester is arranged between the disk body and the cover board; the center of the energy harvester is riveted with an excited magnet which is sleeved in a guide hole of the disk body. The high-speed ball bearing has the advantages that functions of auto power supplying, sensing and monitoring are realized, the structure of mounting equipment is not required to be changed, and true real-time and on-line monitoring can be realized; the structure of the energy harvester and an excitation scheme are reasonable; the energy harvester can be prevented from being twisted and swung through the guide hole; the excitation magnets rotating along with the retainer are used for realizing excitation, so that the ball bearing is high in reliability, high in power generation amount, effective in speed bandwidth and suitable for occasions with high rotating speeds.
Description
Technical field
The invention belongs to bearing and monitoring technical field thereof, be specifically related to the clipping the ball axle of a kind of belt body monitoring assembly
Hold.
Background technology
Bearing is a kind of typical mechanical basic part, in fields such as machinery, vehicle, Aero-Space, steamer and the energy
Suffer from extremely being widely applied；But, bearing is also one of the most flimsy part, whirler in rotary machine
The 30% of tool fault is caused by bearing failure.Therefore, the status monitoring of bearing draws with Incipient Fault Diagnosis
Play the great attention of people.The on-line monitoring of bearing state the most progressively become high-rating generator, steamer, high ferro with
And the technology that the field such as airborne vehicle is indispensable, the index of required monitoring includes such as temperature, vibration, rotating speed and makes an uproar
Sound etc..Bearing monitor system in early days is mainly external hanging type, one of its drawback be between sensor and signal source away from
From farther out, belong to non-contacting indirect measurement, therefore error is bigger.In recent years, people propose not similar shape the most in succession
The Embedded Monitoring System of formula, this method can solve certainty of measurement and accuracy problem, but need to change relevant setting
Standby structure or its integrity, in order to installing sensing and monitoring system, this most easily causes the stress of equipment component
Collect medium problem, the equipment of some structures complexity or limited space also cannot realize；It is the most key,
When monitoring system needs to rotate with bearing inner race or outer ring, not will pass through line powered, and use battery to supply
The electricity use time is the shortest.Therefore, current bearing monitor system is the most all non real-time, the most non-connecing
Touch and measure, it is difficult to obtain the running status of bearing timely and accurately.
Rotate the powerup issue of monitoring system for solving bearing etc., the rotary piezoelectric that there has been proposed various ways is sent out
Electric installation, its principle is to directly utilize relatively rotating between axle with bearing block to encourage pressure by the way of magnetic is encouraged and coupled
Electric tachometer indicator vibrating power-generation, the maximum drawback of this mode of operation electromotor is to be only applicable to more slow-revving situation；When
When rotating speed is higher, between rotary magnet and piezoelectric vibrator end magnets, overlapping time is extremely short, and piezoelectric vibrator is difficult to obtain foot
Enough kinetic energy makes it produce vibration and generate electricity.
Summary of the invention
The present invention provides the high-speed ball bearing of a kind of band integration monitoring assembly, exists solving existing bearing monitor system
In the presence of actual application when rotating speed is higher, between rotary magnet and piezoelectric vibrator end magnets, overlapping time is extremely short,
Piezoelectric vibrator is difficult to obtain enough kinetic energy makes it produce vibration the problem generated electricity.
The present invention adopts the technical scheme that: include inner ring, ball, retainer one and retainer two, outer ring, institute
State retainer one and retainer two be provided with the ball-type chamber for installing ball, for inlay exciting magnet blind hole and
Shoulder hole, retainer one and retainer two and the excitation magnetic in being embedded in the shoulder hole of retainer one and retainer two
Rivet is crossed by Tie Tong, and the two ends of inner ring are provided with multidiameter, the two ends of outer ring are provided with shoulder hole, on described multidiameter
Or in shoulder hole by interference fit equipped with disk body, disk body be respectively provided on two sides with heavy chamber and annular groove, heavy chamber and annular groove
Middle diapire is provided with pilot hole and wire guide, the sidewall of annular groove is provided with sensor one and sensor two or passes
Sensor three and sensor four, circuit board and cover plate are provided with annular groove and heavy chamber by what screw was arranged on disk body respectively
Side, described cover plate is provided with heavy chamber, is crimped with metal film between cover plate and disk body, is placed in heavy chamber and the lid of disk body
By being bonded with piezoelectric film composition energy accumulator on metal film at the heavy chamber of plate, the center riveting of this energy accumulator is subject to
Excitatory ferrum, excited magnet is socketed in pilot hole, described excited magnet and the radius of exciting magnet and the radius of gyration thereof
The most equal, each energy accumulator being placed on same disk body and sensor one and sensor two or sensor three and sensor
Four are connected with circuit board by different wire groups.
One embodiment of the present invention is: be placed in the opposite pole of two exciting magnets of same shaft section near peace
Dress, the axial pole configuration being placed in adjacent actuators Magnet on two circumference of same cross section is in opposite direction, and is placed in list
Quantity n of the exciting magnet on individual retainer should meet following formula, i.e.Its
In, r and R is respectively the radius of exciting magnet and the radius of gyration at center thereof；Or determine angle than meetingWherein Q1 is between two tangent lines intersected at the bearing centre of gyration of exciting magnet
Angle, Q2 is the angle between the center of two adjacent exciting magnets and the line of its centre of gyration.
One embodiment of the present invention is: the material of described metal film is beryllium-bronze, and the material of piezoelectric film is PZT4,
And the span that the thickness of piezoelectric film thickness and energy accumulator is than β be 0.5 < β < 0.7, the radius of piezoelectric film and disk body
The span of ratio α of radius in heavy chamber be 0.5 < α < 0.7.
It is an advantage of the invention that novel structure, bearing self has self energizing sensor monitoring function, as independent mark
Quasi-component uses, it is not necessary to changes its structure installing equipment, can realize real time on-line monitoring truly；Prisoner
Energy device structure and exciting magnet configuration parameter determine rationally and use pilot hole to prevent energy accumulator from rocking, therefore reliability
Height, generated energy are big；Utilize the exciting magnet excitation energy accumulator rotated with retainer, effective speed belt width, can be used for height
Rotating speed occasion.
Accompanying drawing explanation
Fig. 1 is the section of structure of a preferred embodiment of the present invention；
Fig. 2 is the A-A view of Fig. 1；
Fig. 3 is the B-B view of Fig. 1；
Fig. 4 is the assembling structural representation of bearing main body part；
Fig. 5 is to maintain the structural representation of frame；
Fig. 6 is the structural representation of disk body；
Fig. 7 is the configuration relation schematic diagram of exciting magnet and excited magnet；
Fig. 8 be difference of the present invention determine angle than time beam on the graph of relation of active force suffered by Magnet and corner ratio；
Fig. 9 is drive factor of the present invention, maximum force and the graph of relation determining angle ratio；
Figure 10 is the graph of relation of present configuration coefficient and thickness when radius ratio.
Detailed description of the invention
As shown in Fig. 1～Fig. 6, including inner ring 1, ball 2, retainer 1 and retainer 23 ', outer ring 4, institute
State retainer 1 and retainer 23 ' it is provided with the ball-type chamber 31 for installing ball 2, for inlaying excitation magnetic
The blind hole 32 of ferrum C2 and shoulder hole 33, retainer 1 and retainer 23 ' and it is embedded in retainer 1 He
Retainer 23 ' shoulder hole 33 in exciting magnet C2 by rivet, the two ends of inner ring 1 are provided with ladder
Axle 11, the two ends of outer ring 4 are provided with shoulder hole 41, pass through interference fit on described multidiameter 11 or in shoulder hole 41
Equipped with disk body 7, disk body 7 be respectively provided on two sides with heavy chamber 71 and annular groove 72, the end in the middle of heavy chamber 71 and annular groove 72
Wall 73 is provided with pilot hole 74 and wire guide 75, and the sidewall of annular groove 72 is provided with sensor one S1 and sensor
Two S2 or sensor three S3 and sensor four S4, circuit board B and cover plate 5 are arranged on disk body 7 by screw respectively
On be provided with annular groove 72 and the side in heavy chamber 71, described cover plate 5 be provided with heavy chamber 51, cover plate 5 and disk body 7 it
Between be crimped with metal film 6, be placed on the metal film 6 at the heavy chamber 71 of disk body 7 and the heavy chamber 51 of cover plate 5 by viscous
Being connected to piezoelectric film 8 and constitute energy accumulator A, the center riveting of this energy accumulator A has excited magnet C1, excited magnet
C1 is socketed in pilot hole 74, and the radius of described excited magnet C1 and exciting magnet C2 and the radius of gyration thereof are respectively
Equal, each energy accumulator A being placed on same disk body 7 and sensor one S1 and sensor two S2 or sensor three S3
It is connected with circuit board B by different wire groups with sensor four S4.
In work process, when inner ring 1 relatively rotates with outer ring 4, relatively-stationary with inner ring 1 or outer ring 4
Produce relative rotation between energy accumulator A and excited magnet C1 and retainer 3 and 3 ' and exciting magnet C2, thus
Change the axial force between excited magnet C1 and exciting magnet C2, make energy accumulator A generation cyclic bending deform,
And convert mechanical energy into electric energy, power for sensing and monitoring system after the converted process of electric energy generated.The present invention
In, prevent energy accumulator A from rocking by pilot hole 74, therefore bigger generating capacity and higher reliable can be obtained simultaneously
Property.
According to mechanical knowledge, after the stationary object that quality is M is by external force F t action time, its speed obtained
Degree is E=(Ft) for v=Ft/M, kinetic energy2/(2M).Obviously, when other condition is identical, the action time of power
Time too short, object can be not enough to overcome inertia force and still transfixion because of gained energy.Coupling excitation is being encouraged based on magnetic
Rotary piezoelectric generator in, be the action time of exciting force F two overlapping times relatively rotating Magnet,
And increase with rotating speed and shorten, when rotating speed is too high, energy accumulator A will not effectively be encouraged.Therefore, exciting is increased
Action time or the reduction relative rotation speed of power can be effectively increased the external energy that energy accumulator A is obtained.In the present invention,
Ball 2 and retainer 1 and retainer 23 ' and inner ring 1 and outer ring 4 between relative rotation speed n1 be about inner ring
The λ of relative rotation speed n2 between 1 and outer ring 4n=n1/n2=r/R times, therefore in the case of other condition is identical, this
The work of power when the persistent period of active force is that exciting magnet C2 is placed on inner ring 1 or outer ring 4 directly excitation in invention
With the λ of timet=1/ λn=R/r times, wherein, r and R is respectively the radius of exciting magnet C2 and returning of center thereof
Turn radius.Therefore, the present invention utilize the exciting magnet C2 rotated with retainer 3 and 3 ' encourage energy accumulator A,
The kinetic energy obtained is to utilize the λ installed on inner ring 1 or outer ring 4 when exciting magnet C2 directly encouragesE=(R/r)2
Times, thus effectively speed belt width, be more suitable for the occasion that rotating speed is higher.
In the present invention, for improving the generated energy of energy accumulator A, it is placed in two exciting magnet C2's of same shaft section
Opposite pole, near installing, is placed in the axial pole configuration side of adjacent actuators Magnet C2 on two circumference of same cross section
To on the contrary, and be placed in bearing the same side retainer 1 or retainer 23 ' on quantity n of exciting magnet C2 should
Meet following formula, i.e.Wherein, r and R is respectively the half of exciting magnet C2
Footpath and the radius of gyration at center thereof；Or determine angle than meetingWherein Q1 is exciting magnet C2
Two at the bearing centre of gyration intersect tangent lines between angle, Q2 be two adjacent exciting magnet C2 center with
Angle between the line of its centre of gyration.
For improve energy accumulator A generated energy, should improve as far as possible when other condition determines energy accumulator A deflection and
It is excited number of times, the i.e. amplitude of exciting force suffered by raising and encourages number of times, and the excited magnet C1 on energy accumulator A should be made
Bear captivation alternately and repulsive force, therefore the configuration mode of the magnetic pole of exciting magnet C2 is: be placed in same shaft section
Two exciting magnet C2 opposite pole near install, be placed in adjacent actuators Magnet on two circumference of same cross section
The axial pole configuration of C2 is in opposite direction；Additionally, when bearing inner race 1 and outer ring 4 relatively rotate one week, single
The electric energy that energy accumulator A produces is represented by:Wherein CfFor prisoner's energy
The free capacitance of device A, Vg=η F is the open-circuit voltage that energy accumulator A generates, and η is and energy accumulator A yardstick and material
Expect relevant voltage coefficient, h=nF2It is referred to as drive factor, λ=Cfη2/ 2 are referred to as structural coefficient, and n is single guarantor
Hold frame 3 or 3 ' quantity of upper exciting magnet C2.Obviously, when other condition determines, can be by improving active force
F, quantity n of exciting magnet C2 and structural coefficient λ improve voltage and electric energy；Wherein, the number of exciting magnet C2
Amount n is by changing the power generation characteristics encouraging number of times and amount of force two aspect to affect energy accumulator A.According to the present invention
The operation principle of ball bearing and magnetic field are the practical situation of spatial distribution, and arbitrary excited magnet C1 is the most simultaneously by many
The effect of individual exciting magnet C2, the size of total force F depends on determining angle ratioWhereinFor the angle between the tangent lines that two of exciting magnet C2 are intersected at the bearing centre of gyration,
Q2=2 π/n is the angle between the two adjacent centers of exciting magnet C2 and the line of its centre of gyration, r and R is respectively
For radius and the radius of gyration at center thereof of exciting magnet C2, thus exciting magnet C2 number can be converted into by determining angle ratio
The function of amount n, i.e.Further investigations have shown that, there is different optimal angles of determining and compare k
Make the active force suffered by energy accumulator A, voltage and electric energy maximum；When taking k=1～1.5, i.e. exciting magnet C2 number
Amount n in the range ofTime, the electric energy obtained and voltage are the biggest, wherein swash
Encourage coefficient and be not less than the 1/2 of its maximum.
Fig. 8 give different determine angle than time excited magnet C1 suffered by the test than j=Q3/Q1 of directed force F and corner
Curve, the corner that wherein Q3 is turned over after completely overlapped by excited magnet C1 and a certain exciting magnet C2, therefore turn
What angle characterized than j is the position relationship between excited magnet C1 and each exciting magnet C2.Fig. 8 illustrates, determines angle ratio not
Meanwhile, the size of exciting magnet C2 active force suffered by excited magnet C1 and the number of times of excitation are different.Active force amplitude
And drive factor with determine the angle relation curve than k as shown in Figure 9, it is clear that, when taking k=1.0～1.5, gained electricity
Pressure and electric energy are the biggest, and drive factor is more than the 1/2 of its maximum.
In the present invention, for improving the generating capacity of energy accumulator A self, the material of metal film 6 is beryllium-bronze, piezoelectricity
The material of film 8 is PZT4, and the span that the thickness of piezoelectric film 8 thickness and energy accumulator A is than β is
0.5 < β < 0.7, the radius of piezoelectric film 8 with the span of the ratio α of the radius in the heavy chamber 71 of disk body 7 is
0.5<α<0.7。
The present invention uses the energy accumulator A of circular piezoelectric film 8 and metal film 6 bonding structure, when energy accumulator A thickness and
The radius in the heavy chamber 71 of disk body 7 is given timing, the thickness of piezoelectric film 8 and radius excessive or too small all can make energy accumulator A
Generating capacity reduces, and there is optimal piezoelectric film 8 thickness with energy accumulator A gross thickness than β and piezoelectric film 8 in reality
The ratio α of radius and the radius in the heavy chamber 71 of disk body 7 make the i.e. structural coefficient of generated energy of energy accumulator A maximum.Work as gold
After the material parameter of genus film 6 and piezoelectric film 8 determines, generated energy or structural coefficient λ and thickness can be tried to achieve further
Than β and the relation of radius ratio α.The material of the metal film 6 of the present invention is beryllium-bronze, and the material of piezoelectric film 8 is
The relation of PZT4, its structural coefficient and thickness when radius ratio is as shown in Figure 10.According to Figure 10, the present invention is by beryllium
The preferable parameter area of bronze and PZT4 constituted energy accumulator A is 0.5 < β < 0.7,0.5 < α < 0.7.
Claims (2)
1. a high-speed ball bearing for band integration monitoring assembly, including inner ring, ball, retainer one and retainer
Two, outer ring, it is characterised in that: described retainer one and retainer two be provided with the ball-type chamber for installing ball,
For inlaying blind hole and the shoulder hole of exciting magnet, retainer one and retainer two and being embedded in retainer one and protect
Holding the exciting magnet in the shoulder hole of frame two and pass through rivet, the two ends of inner ring are provided with the two ends of multidiameter, outer ring
It is provided with shoulder hole, is set respectively equipped with disk body, the both sides of disk body by interference fit on described multidiameter or in shoulder hole
Having heavy chamber and annular groove, the diapire in the middle of heavy chamber and annular groove is provided with pilot hole and wire guide, and the sidewall of annular groove is installed
Sensor one and sensor two or sensor three and sensor four, circuit board and cover plate is had to be arranged on by screw respectively
Being provided with annular groove and the side in heavy chamber on disk body, described cover plate is provided with heavy chamber, is crimped with gold between cover plate and disk body
Belong to film, be placed on the metal film at the heavy chamber of disk body and the heavy chamber of cover plate by being bonded with piezoelectric film composition energy accumulator,
The center riveting of this energy accumulator has excited magnet, excited magnet to be socketed in pilot hole, and described excited magnet is with sharp
The radius of field core and the radius of gyration thereof are the most equal, each energy accumulator being placed on same disk body and sensor one and biography
Sensor two or sensor three are connected with circuit board by different wire groups with sensor four；
The opposite pole of two exciting magnets being placed in same shaft section is close to be installed, and is placed in two circles of same cross section
On week, the axial pole configuration of adjacent actuators Magnet is in opposite direction, and the number of the exciting magnet being placed on single retainer
Amount n should meet following formula, i.e.Wherein, r and R is respectively exciting magnet
Radius and the radius of gyration at center；Or determine angle than meetingWherein Q1 is excitation magnetic
Two of ferrum at the bearing centre of gyration intersect tangent line between angle, Q2 be two adjacent exciting magnets center with
Angle between the line of its centre of gyration.
The high-speed ball bearing of a kind of band integration monitoring assembly the most according to claim 1, it is characterised in that:
The material of described metal film is beryllium-bronze, and the material of piezoelectric film is PZT4, and the thickness of piezoelectric film thickness and energy accumulator
Span than β is 0.5 ＜ β ＜ 0.7, the value model of the radius of piezoelectric film and the ratio α of the radius in the heavy chamber of disk body
Enclosing is 0.5 ＜ α ＜ 0.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410233028.XA CN103982539B (en) | 2014-05-28 | 2014-05-28 | High-speed ball bearing with integrated monitoring assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410233028.XA CN103982539B (en) | 2014-05-28 | 2014-05-28 | High-speed ball bearing with integrated monitoring assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103982539A CN103982539A (en) | 2014-08-13 |
| CN103982539B true CN103982539B (en) | 2017-01-11 |
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| CN201410233028.XA Expired - Fee Related CN103982539B (en) | 2014-05-28 | 2014-05-28 | High-speed ball bearing with integrated monitoring assembly |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110552956B (en) * | 2019-08-14 | 2020-11-10 | 上海交通大学 | Full self-powered rolling bearing internal sensing data acquisition wireless transmission device |
| CN113364349B (en) * | 2021-07-05 | 2022-12-06 | 浙江师范大学 | Train wheel set monitoring device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006052742A (en) * | 2004-08-09 | 2006-02-23 | Ntn Corp | Bearing with built-in tag for rfid with self-power generation function |
| WO2011059129A1 (en) * | 2009-11-10 | 2011-05-19 | (주)우광테크 | Energy harvesting device employing a piezoelectric ceramic and magnets |
| CN102801357A (en) * | 2012-09-01 | 2012-11-28 | 浙江师范大学 | Piezoelectric power-generation device for supplying power for rail vehicle bearing monitoring system |
| CN203856882U (en) * | 2014-05-28 | 2014-10-01 | 浙江师范大学 | High-speed ball bearing with integral monitoring component |
-
2014
- 2014-05-28 CN CN201410233028.XA patent/CN103982539B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006052742A (en) * | 2004-08-09 | 2006-02-23 | Ntn Corp | Bearing with built-in tag for rfid with self-power generation function |
| WO2011059129A1 (en) * | 2009-11-10 | 2011-05-19 | (주)우광테크 | Energy harvesting device employing a piezoelectric ceramic and magnets |
| CN102801357A (en) * | 2012-09-01 | 2012-11-28 | 浙江师范大学 | Piezoelectric power-generation device for supplying power for rail vehicle bearing monitoring system |
| CN203856882U (en) * | 2014-05-28 | 2014-10-01 | 浙江师范大学 | High-speed ball bearing with integral monitoring component |
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