GB2534419A - Wireless bearing monitoring device - Google Patents

Wireless bearing monitoring device Download PDF

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Publication number
GB2534419A
GB2534419A GB1501242.0A GB201501242A GB2534419A GB 2534419 A GB2534419 A GB 2534419A GB 201501242 A GB201501242 A GB 201501242A GB 2534419 A GB2534419 A GB 2534419A
Authority
GB
United Kingdom
Prior art keywords
antenna
bearing
frequency range
monitoring device
bearing monitoring
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.)
Withdrawn
Application number
GB1501242.0A
Other versions
GB201501242D0 (en
Inventor
Van Amerongen Gertjan
Hiddink Bart
Simon Willem Den Haak Nicolaas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF AB
Original Assignee
SKF AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SKF AB filed Critical SKF AB
Priority to GB1501242.0A priority Critical patent/GB2534419A/en
Publication of GB201501242D0 publication Critical patent/GB201501242D0/en
Priority to PCT/EP2015/078294 priority patent/WO2016119949A1/en
Publication of GB2534419A publication Critical patent/GB2534419A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/04—Bearings
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7806—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for spherical roller bearings
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/008—Identification means, e.g. markings, RFID-tags; Data transfer means
    • 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C25/00—Arrangements for preventing or correcting errors; Monitoring arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • 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
    • F16C2233/00—Monitoring condition, e.g. temperature, load, vibration
    • 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
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/06—Ball or roller bearings
    • F16C23/08—Ball or roller bearings self-adjusting
    • F16C23/082—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface
    • F16C23/086—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface forming a track for rolling elements
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
    • F16C33/7853—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race
    • F16C33/7856—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race with a single sealing lip
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C2200/00—Transmission systems for measured values, control or similar signals

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The invention relates to a bearing monitoring device including a sensor assembly (20) configured be mounted on a cover member (18) of a bearing and a wireless transmitter for transmitting and receiving data relating to the operation of the sensor assembly (20) in a predetermined frequency range, wherein the wireless transmitter includes at least one antenna (22). In order to account for detuning due to lubricant and steel in the environment of the antenna (22), the antenna (22) has a rated frequency range, wherein a lower limit frequency of the rated frequency range is higher than an upper limit frequency of the predetermined frequency range.

Description

Wireless Bearing Monitoring Device
Field of the Invention
The invention relates to a wireless bearing monitoring device and to a bearing equipped with such a device.
Background of the Invention
It is known to provide rotating parts of bearings with bearing monitoring systems including a wireless transmitter. In some applications, the transmitter and its antenna are located remote from the bearing in order to avoid a degradation of the radio signals. When trying to integrate wireless systems into universally applicable bearings with standard dimensions, it is necessary to respect the boundary dimensions and to integrate the antenna into the bearing unit. Due to the small available space, the solid and moving metal parts and grease in close proximity to the possible locations of the antenna and the harsh environmental conditions, it has been difficult to make an antenna to meet the requirements. In typical applications, the receiver will be placed at a distance of one or more meters and the attenuation of the signal should not exceed a certain threshold depending on the application.
It has proved very difficult to find suitable antennae for use in bearing cover elements. The bearing monitoring device should fit into standard bearing dimensions and be able to operate in close proximity to voluminous parts of steel or of lubricant. In these harsh environments there are multiple factors that impact antenna performance. Steel casings of the bearing will act as Faraday cages, completely blocking RF signals. In addition, the steel parts will produce reflec-tions which might cause intersymbol interference in time and degrade communication performance. Steel parts that are within a quarter wavelength will detune the antenna. The same accounts for grease and oil. The inventors have observed a significant detuning of the antenna especially due to grease and oil. Further, the grease/oil in close proximity to the antenna will dampen the radio waves, reducing the range. Tolerances and non-perfect running conditions like misalignment will dynamically influence the antenna's performance. In addition to the above, such antennae should also meet the need of scalability and cascadability due to the various sizes and types of bearings needed. The device should be suitable for integration into standard bearings for which the environment is difficult to predict. The antenna design should therefore be particularly robust against changes of the environment. The difficulty of finding a suitable antenna is further increased, as limited experience is available with the use of steel enclosures in combination with oil or grease.
The document WO 2010015231A1 discloses a bearing monitoring device including a patch antenna which is associated with the body of the bearing component and which is disposed on the bearing holder. The patch antenna interacts with an RFID-tag that is disposed on the bearing. Said bearing compo-nent and/or said bearing arrangement according to WO 20100015231 Al solve the problem of providing a bearing component and/or a bearing arrangement having an antenna that is advantageous for polling by way of electromagnetic radiation.
The document US 20100283208A1 discloses a sealing element of a bearing carrying an IC element and an antenna.
The miniaturization of antennae has made enormous progress in the last years. Noteworthy developments include fractal antennae as disclosed in the US patent No. 9501019 and multilevel antennae as disclosed in the document EP 1 223 637 Al. Fractal antennae or generally antennae with self-similar geometries having self-similar elements in different orders of magnitude lend themselves to operation in multiple frequency ranges which can be combined to form a single ultra-wide frequency band (UWB) while being compact in design and may be integrated in a small SMD chip with dimensions of approximately 10mm x 10mm. An example of an antenna chip of this kind is UWB chip antenna FR-05-S1-P-0-107 available from Fractus S.A., Barcelona, Spain. The intended field of application for this antenna is Wireless USB for mobile phones or other handheld high-tech devices. The applicability to mechanical devices operating under harsh environmental conditions has hitherto been considered impossible due to the sensitivity and fragility of these devices.
Summary of the Invention
The invention seeks to overcome the above problems and to provide a bearing monitoring device including a sensor assembly with a reliable wireless communication means in order to enable a robust and reliable communication between a sensorized bearing equipped with the bearing monitoring device and a network even under harsh environments.
The invention relates to a bearing monitoring device including a sensor assembly configured be mounted on a cover member of a bearing. The cover member is arraned at an axial side of the bearing and at least partly encloses the bearing cavity in which rolling elements of the bearing are accomodated. The rolling elements may be balls or rollers of any kind. The cover member may in particular be a seal or a metal capping ring arranged radially between an inner ring and an outer ring of the bearing.
The bearing monitoring device includes a wireless transmitter for transmitting and receiving data relating to the operation of the sensor assembly in a predetermined frequency range, wherein the wireless transmitter includes at least one antenna.
It is proposed that the antenna has a rated frequency range, wherein a lower limit frequency of the rated frequency range is higher than an upper limit frequency of the predetermined frequency range. The inventors have found that the selection of a rated frequency range according to the invention leaves room for and accounts for the typical detuning experienced once the antenna is mounted in the sensor bearing and the sensor bearing is mounted in its application. Extensive experimentation has uncovered that the signal quality is sufficiently high, although the signals are strongly influenced by the environment.
Wireless sensor assemblies are particularly suitable for applications where the assembly and the bearing cover member are mounted on the rotating ring of the bearing. However, applications where wireless technology is advantageous for devices attached to the non-rotating ring of the bearing may exist as well.
Here and in the following, the rated frequency range is the frequency range indicated by the manufacturer of the antenna chip and is defined as usual in the field of antennae. Alternatively, the rated frequency range may be defined as the frequency range within which the voltage standing wave ratio (VSWR) is 1.1 or less or, as a further alternative definition, where the total efficiency of the antenna is 80% or more. Irrespective of the definition, the rated frequency range is determined in a neutral environment prior to mounting the antenna to the bearing or to the bearing monitoring device.
Preferably, the lower limit frequency of the rated frequency range is at least 10%, or even at least 20% higher than the upper limit frequency of the predetermined frequency range. This leaves sufficient room even for strong detuning. In order to account for a decrease of the bandwidth as it is typically entailed by the detuning, it is proposed rated frequency range of the antenna is wider than the predetermined frequency range In a preferred embodiment of the invention, the predetermined frequency range is within the range below 2.5GHz and the lower limit of the rated frequency range is above 3 GHz. In the preferred embodiments, the predetermined frequency range is one of the ISM bands defined by the ITU-R in 5.138, 5.150, and 5.280 of the Radio Regulations, most preferably the frequency range between 2.4GHz and 2.5GHz.
According to a further aspect of the invention, it is proposed that the antenna has a rated frequency range between 3.1 and 5 GHz. The bandwidth should prefera-bly amount to 1.9 GHz or more. Preferably, the antenna is a chip antenna for Ultra Wideband (UWB) applications. These antenna chips are available on the market for wireless USB. Extensive experimentation has uncovered that these antenna chips are sufficiently robust for use in sensor bearing applications.
In a preferred embodiment of the invention, the cover is a metal ring having at least one window for the antenna. The metal ring is preferably configured to cover the roller bearing cavity and the antenna is preferably mounted on the inner side of the metal ring, i.e. the side facing the rollers.
In a preferred embodiment of the invention, the bearing is grease lubricated. The advantages of the invention are particularly clear in this case because extensive experimentation has uncovered that the antenna design according to the invention is highly robust against influences of large volumes of lubricant in close proximity to the bearing.
According to a further aspect of the invention, it is proposed that the antenna is mounted on board with a clearance zone, i.e. a PCB zone without ground plate beneath the antenna. Accordingly, the ground plate cannot reflect or screen the signal transmitted by the antenna. In alternative embodiments, the antenna could be mounted next to the board and connected to the transceiver e.g. by a coaxial cable.
The inventors further propose that the antenna is mounted on board having a feed trace structure on the side opposite to the side of the antenna. This arrangement avoids close proximity between the feed structure and the cover member through which the antenna protrudes.
In a preferred embodiment of the invention, said cover member has a radial width of 13.5 mm or less. Further, the antenna is preferably configured to be accommodated within space of less than 7 mm between cover member and rollers.
The inventors further propose that no LC matching circuit is provided for matching the frequency bandwidth of the antenna. The LC matching cirquit would impair the overall Q factor of the network and it has turned out that the typical steel and grease environment is sufficient for matching the antenna.
A further aspect of the invention relates to a bearing including a bearing monitoring device as described above.
In a preferred embodiment of the invention, the bearing is a spherical roller bearing. The varying environment of the spherical roller bearing requires a particular degree of insensitivity against changes of the environment, which is what the invention provides.
In its preferred embodiment, the invention combines fractal antenna technology with bearings. The preferred fractal antenna is ultra wide band optimized for a rated frequency range between 3 -6 GHz, which allows for the big detuning caused by the presence of grease/oil. The antenna is designed to fit in a steel cover that is mounted to the side of the bearing. Due to the large bandwidth (frequency range) of the fractal antenna, the inventors suggest a well defined "de-tuning" by design, i.e. in one of the designs the direct environment of the antenna will be controlled by encapsulation / potting of the antenna. The de-tuning by the controlled direct environment will shift the frequency range of the antenna from the rated frequency range to a range overlapping with the predetermined frequency range required by the application.
The above embodiments of the invention as well as the appended claims and figures show multiple characterizing features of the invention in specific combinations. The skilled person will easily be able to consider further combinations or sub-combinations of these features in order to adapt the invention as defined in the claims to his specific needs.
Brief Description of the Figures
Fig. 1 illustrates a bearing equipped with a bearing monitoring device ac-cording to the invention; and Fig. 2 illustrates a circuit board for use in a bearing monitoring device according to Fig. 1.
Detailed Description of the Embodiments
Fig. 1 illustrates schematically a grease lubricated spherical roller bearing having an inner ring 10, an outer ring 12 and a plurality of rolling elements 14 formed as rollers arranged in a cage 16 between the inner ring 10 and the outer ring 12.
The rollers 14 are protected by a cover member 18 formed as a metal capping ring.
The system is a sensor bearing equipped with a bearing monitoring device including a sensor assembly 20 configured be mounted on the inside of the cover member 18 of a bearing or in a recess/window of the cover member 18.
The sensor assembly 20 includes a wireless RF transceiver (not shown) for transmitting and receiving data relating to the operation of the sensor assembly in a predetermined frequency range which is a frequency range of a receiver 21 located roughly 1 m away from the bearing, wherein the wireless transceiver includes at least one antenna 22. The sensor assembly 20 further includes one or multiple sensors formed as e.g. a temperature sensor, vibration sensor, acoustic emission sensor or a probe for measuring the chemical properties of the lubricant (not shown). Further, the sensor assembly 20 may optionally include power harvesting means or a battery for operating the wireless transmitter (not shown).
In a sensor assembly 20 according to the invention, the antenna 22 has a rated frequency range, wherein a lower limit frequency of the rated frequency range is higher than an upper limit frequency of the predetermined frequency range.
In the preferred embodiment of the invention, the predetermined frequency range is the ISM band between 2.4GHz and 2.5GHz and the antenna is formed as a fractal SMD antenna chip for Ultra Wideband (UWB) applications having a rated frequency range between 3.1 and 5 GHz. In other words, the lower limit frequency of the rated frequency range is roughly 20% higher than the upper limit frequency of the predetermined frequency range.
The cover member 18 / metal ring has at least one window 24 for the antenna 22 and the antenna chip is embedded into the window 24 such that the axially outer surface of the capping is essentially flat, i.e. that the antenna 22 does not protrude over the axially outer surface. The antenna 22 is quadratic with edges of 10 mm length and the window 24 is quadratic with edges of 13 mm length. The clearance between the antenna and the edges of the window has a width amounting to 30% of the length of the edges of the antenna 22 and is filled with potting material 26. The potting material 26 is selected based on its RF properties, i.e. is an RF controlled material.
Fig. 2 illustrates a printed circuit board 30 with an antenna 22 mounted thereon. A clearance zone (not illustrated) without ground plate is located beneath the antenna 22. A feed trace structure 28 is illustrated in dashed lines and arranged on the side facing the rollers 14 opposite to the side of the antenna 22. The board 30 has a curved shape adapted to the curvature of the cover member. The board has a radial width of 13.5 mm and spans about 40 degrees in a circumferential direction of the cover ring 18.
The antenna 22 is configured to be accommodated within an axial space of less than 7 mm between cover member 18 and rollers. 14 The height of the assembly in Fig. 2 perpendicular to the drawing plane is therefore 7 mm or less.
In the final assembly, the board 30 (equipped with further electronic devices and/or sensors as desired) is fixed to the cover member 18 by a nylon screw and potted in order to protect the devices mounted on it.
The invention combines ultra high bandwith leading to insensitivety for the presence of grease/oil and metal and different geometries from bearing types/sizes with an impoved sensor cap design for achieving a controlled de-tuning by shaping the environment, and protection of a sensitive element from mechanical impacts.
The invention provides a wireless antenna 22 that can be integrated into a bearing end-cap or seal. This antenna design enables wireless data transmission in harsh environments that are common to bearing applications.
The inventors have tested the device according to the invention for a bearing with 100 mm inner ring diameter and found a sufficient matching for a large variety of operating conditions including grease volumes at different locations for the 5 2.4 GHz frequency band.

Claims (15)

  1. Claims 1. Bearing monitoring device including: a. a sensor assembly (20) configured be mounted on a cover mem-ber (18) of a bearing; b. a wireless RF transceiver for transmitting and receiving data relating to the operation of the sensor assembly (20) in a predetermined frequency range, wherein the wireless transmitter includes at least one antenna (22); characterized in that said antenna (22) has a rated frequency range, wherein a lower limit frequency of the rated frequency range is higher than an upper limit frequency of the predetermined frequency range.
  2. 2. Bearing monitoring device according to claim 1, characterized in that the lower limit frequency of the rated frequency range is at least 10% higher than the upper limit frequency of the predetermined frequency range.
  3. 3. Bearing monitoring device according to claim 1 and 2, characterized in that the lower limit frequency of the rated frequency range is at least 20% higher than the upper limit frequency of the predetermined frequency range.
  4. 4. Bearing monitoring device according to one of the preceding claims, characterized in that said rated frequency range of the antenna (22) is wider than the prede-termined frequency range.
  5. 5. Bearing monitoring device according to one of the preceding claims, characterized in that said predetermined frequency range is within the range below 2.5GHz and said lower limit of the rated frequency range is above 3 GHz.
  6. 6. Bearing monitoring device according to one of the preceding claims, characterized in that said antenna has a rated frequency range between 3.1 and 5 GHz.
  7. 7. Bearing monitoring device according to one of the preceding claims, characterized in that said antenna has a rated frequency range with a bandwidth of at least 1.9 GHz.
  8. 8. Bearing monitoring device according to one of the preceding claims, characterized in that said antenna is a chip antenna for Ultra Wideband (UWB) applications.
  9. 9. Bearing monitoring device according to one of the preceding claims, characterized in that the cover member is a metal ring (18) having at least one window (22) for the antenna (22).
  10. 10. Bearing monitoring device according to one of the preceding claims, characterized in that said antenna (22) is mounted on board (30) with a clearance zone beneath the antenna (22).
  11. 11. Bearing monitoring device according to one of the preceding claims, characterized in that said antenna (22) is mounted on board (30) having a feed trace structure (28) on the side opposite to the side of the antenna (22).
  12. 12. Bearing monitoring device according to one of the preceding claims, characterized in that the antenna (22) is configured to be accommodated within a space of less than 7 mm between the cover member (18) and rolling elements (14) of 20 25 30 the bearing.
  13. 13. Bearing monitoring device according to one of the preceding claims, characterized in that no LC matching circuit is provided for matching the frequency bandwidth of the antenna (22).
  14. 14. Bearing including a bearing monitoring device according to one of the preceding claims.
  15. 15. Bearing according to claim 14, characterized in that the bearing is spherical roller bearing.
GB1501242.0A 2015-01-26 2015-01-26 Wireless bearing monitoring device Withdrawn GB2534419A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1501242.0A GB2534419A (en) 2015-01-26 2015-01-26 Wireless bearing monitoring device
PCT/EP2015/078294 WO2016119949A1 (en) 2015-01-26 2015-12-02 Wireless bearing monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1501242.0A GB2534419A (en) 2015-01-26 2015-01-26 Wireless bearing monitoring device

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Publication Number Publication Date
GB201501242D0 GB201501242D0 (en) 2015-03-11
GB2534419A true GB2534419A (en) 2016-07-27

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WO (1) WO2016119949A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022109794A1 (en) * 2020-11-24 2022-06-02 舍弗勒技术股份两合公司 Rolling bearing assembly capable of realizing self-monitoring
IT202100029612A1 (en) * 2021-11-24 2023-05-24 Skf Ab BEARING UNIT WITH SENSORED SCREEN

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Publication number Priority date Publication date Assignee Title
JP7370829B2 (en) * 2019-11-28 2023-10-30 日立Astemo株式会社 Millimeter wave radio sensor and vehicle equipped with it
AT524189B1 (en) * 2020-08-31 2022-06-15 Miba Gleitlager Austria Gmbh bearing element

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Publication number Priority date Publication date Assignee Title
EP0571875A1 (en) * 1992-05-29 1993-12-01 Skf Industrie S.P.A. A rolling bearing temperature gauging device
US6324899B1 (en) * 1998-04-02 2001-12-04 Reliance Electric Technologies, Llc Bearing-sensor integration for a lubrication analysis system
WO2013160053A1 (en) * 2012-04-24 2013-10-31 Aktiebolaget Skf Bearing monitoring method and system

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DE10017572B4 (en) * 2000-04-10 2008-04-17 INSTITUT FüR MIKROTECHNIK MAINZ GMBH Rolling bearings with remote sensing units
US7053629B2 (en) * 2001-09-28 2006-05-30 Siemens Communications, Inc. System and method for detecting the proximity of a body

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
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