JP4019680B2 - Rolling bearing - Google Patents

Rolling bearing Download PDF

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Publication number
JP4019680B2
JP4019680B2 JP2001310108A JP2001310108A JP4019680B2 JP 4019680 B2 JP4019680 B2 JP 4019680B2 JP 2001310108 A JP2001310108 A JP 2001310108A JP 2001310108 A JP2001310108 A JP 2001310108A JP 4019680 B2 JP4019680 B2 JP 4019680B2
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Prior art keywords
temperature difference
detecting element
rolling bearing
difference detecting
temperature
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JP2003113835A (en
Inventor
賢志 坂本
秀明 石井
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JTEKT Corp
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JTEKT Corp
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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
    • 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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C33/7846—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 a gap between the annular disc and the inner race

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、温度センサを備えた転がり軸受に関する。
【０００２】
【従来の技術】
従来、転がり軸受としては、温度センサを備え、自身の温度を検出することで、潤滑不足等に起因する温度上昇を検出できるようにしたものがある。
【０００３】
ところで、この温度センサを内蔵した転がり軸受では、この温度センサに電源電力を供給する必要があるので、電力供給用ハーネスが必須であった。このため、センサのための回路が複雑化していた。また、センサの無線化の障害になっていた。
【０００４】
【発明が解決しようとする課題】
そこで、この発明の目的は、温度センサへの電力供給用ハーネスを不要とすることができ、センサに関連する回路を簡単にでき、センサの無線化を図れる転がり軸受を提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、請求項１の発明の転がり軸受は、転動体と、この転動体が転動する軌道面を有する回転輪および固定輪と、
転がり軸受の内部と外部との温度差に応じて起電力を発生する熱起電素子からなる温度差検出素子と、
上記温度差検出素子に接続され、かつ上記起電力を上記温度差を表す信号として無線送信する回路とを備え、
転がり軸受の内部をシールするためのシール部を有し、
このシール部に、上記温度差検出素子を配置し、
上記温度差検出素子は、上記シール部の軸方向外方に位置すると共に上記転がり軸受の内部と外部との温度差を増大させる凹凸状の冷却フィンを有することを特徴としている。
【０００６】
この請求項１の発明によれば、温度差検出素子が熱起電素子からなり、この熱起電素子は、転がり軸受の内部と外部との温度差に応じて起電力を発生し、この発生した起電力が上記温度差を表す信号となる。したがって、この発明によれば、温度センサとしての温度差検出素子に対する電源が不要であるから、温度センサへの電力供給用ハーネスを不要とすることができ、センサに関連する回路を簡単にでき、上記信号を無線送信する回路を設けることで、センサの無線化を図れる。
【０００７】
また、この請求項１の発明によれば、上記シール部に温度差検出素子を配置したことで、上記温度差検出素子でもってシール部の外側の温度と内側の温度との温度差を感知し易くなり、温度差検出精度の向上を図れる。
【０００８】
また、一参考例の転がり軸受では、上記固定輪の軌道面の反対側の周面に凹部が形成され、この凹部に上記温度差検出素子を配置し、上記温度差検出素子の外側面は、上記凹部の開口側で露出している。
【０００９】
この請求項２の発明によれば、固定輪の軌道面の反対側の周面に形成された凹部に温度差検出素子を配置したから、この温度差検出素子は、上記軌道面からの熱が伝達される上記凹部の底の温度と、この凹部の開口側の外部の温度との温度差に応じて起電力を発生する。
【００１０】
この発明によれば、上記凹部に上記温度差検出素子を配置したことで、この凹部が存在しない周面に温度差検出素子を配置する場合に比べて、温度差検出素子を発熱源である軌道面よりに近づけることができ、軸受内部温度をより正確に、かつ時間差なく検出でき、かつ、凹部の開口側では温度差検出素子が空冷されることとなる。したがって、温度差検出素子が検出する温度差をより大きくすることができ、出力電圧を大きくして、検知感度の向上を図れる。
【００１１】
【発明の実施の形態】
以下、この発明を図示の実施の形態により詳細に説明する。
【００１２】
図１に、この発明の転がり軸受の実施形態の断面を示す。この転がり軸受は、回転輪である内輪１と固定輪である外輪２と、内輪１の軌道面１Ａと外輪２の軌道面２Ａとの間に周方向に所定間隔を隔てて複数個だけ配置された転動体としての玉３を有している。
【００１３】
この内輪１と外輪２との間の軸方向の両端にシール部５,６が配置されている。上記シール部５と６との間には、潤滑剤として例えばグリースが封入されている。
【００１４】
シール部５の基部５Ａは外輪２の内周面の軸方向の一端の溝７に固定され、先端リップ５Ｂは内輪１の外周面の軸方向の一端の凹部８に対して所定の微小隙間を隔てている。また、シール部６は、基部６Ａが外輪２の内周面の軸方向の他端の溝１０に固定され、先端リップ６Ｂは内輪１の外周面の軸方向の他端の凹部１１に対して所定の微小隙間を隔てている。
【００１５】
このシール部６のシールリップ９の径方向の略中央には、開口１３が形成され、この開口１３に熱起電素子としてのペルチェ素子からなる温度差検出素子１２が嵌め込まれて固定されている。この温度差検出素子１２は、内側面１２Ａが玉３に対向し、外側面１２Ｂは冷却フィンになっている。そして、この温度差検出素子１２には信号線(図示せず)が接続され、温度差検出素子１２が内側面１２Ａと外側面１２Ｂで感知した軸受内部と外部の温度差に応じて発生した起電力が上記信号線に出力される。
【００１６】
この転がり軸受では、温度差検出素子１２が熱起電素子であるペルチェ素子からなり、この温度差検出素子１２は、内側面１２Ａと外側面１２Ｂとの温度差によって起電力を発生し、この発生した起電力が上記温度差を表す信号となる。この起電力は、図４に例示するように、上記温度差に略比例した値となる。
【００１７】
したがって、この実施形態によれば、熱起電素子であるペルチェ素子を温度差検出素子１２としたことで、温度差検出素子１２に対する電源が不要であるから、温度差検出素子１２への電力供給用ハーネスを不要とすることができ、温度センサに関連する回路を簡単にでき、上記信号を無線送信する回路を設けることで、温度センサの無線化を図れる。
【００１８】
また、この実施形態によれば、上記シール部６に温度差検出素子１２を配置したことで、シール部６の外側の温度と内側の温度との温度差、特に潤滑剤の温度を感知し易くなり、温度差検出精度の向上を図れる。また、温度差検出素子１２の外側面１２Ｂが凹凸状の冷却フィンになっているから、高温となる軸受内部と比較的低温となる軸受外部との温度差を増大させることができ、温度差を検出し易くなる。
【００１９】
なお、上記実施形態では、温度差検出素子１２を１つだけ備えたが、図２に示すように、シール部６のシールリップ９の周方向に所定の間隔を隔てて複数個の開口１３を形成し、各開口１３にそれぞれ温度差検出素子１２を嵌め込み固定してもよい。この場合、上記複数の温度差検出素子１２のペルチェ素子を直列に接続すれば、出力信号となる起電力を大きくできるから、温度差検知感度を向上できる。
【００２０】
また、上記実施形態では、シール部６に温度差検出素子１２を固定したが、シール部６に温度差検出素子１２を固定せずに、図３に示すように、外輪２の外周面２Ｂに凹部１５を形成し、この凹部１５の底面１５Ａに温度差検出素子１２の内側面１２Ａを固定した場合は参考例となる。この場合、外輪２の軌道面２Ａの反対側の周面２Ｂに形成された凹部１５に温度差検出素子１２を配置したから、この温度差検出素子１２は、上記軌道面２Ａからの熱が伝達される上記凹部１５の底１５Ａの温度と、この凹部１５の開口側の外部の温度との温度差に応じて起電力を発生する。また、凹部１５に温度差検出素子１２を配置したことで、この凹部１５が無い外周面２Ｂに温度差検出素子１２を配置した場合に比べて、温度差検出素子１２の内側面１２Ａを発熱源である軌道面２Ａよりに近づけることができ、軸受内部、特に軌道面２Ａの温度をより正確かつ時間差なく検出でき、かつ、凹部１５の開口側では温度差検出素子１２の外側面１２Ｂが空冷されることとなる。したがって、温度差検出素子が検出する温度差をより大きくすることができ、出力電圧を大きくして、検知感度の向上を図れる。
【００２１】
また、上記実施形態では、シール部５,６を備えたが、シール部に替えて密封板としてもよい。また、上記実施形態では、内輪１を回転輪とし、外輪２を固定輪としたが、内輪１を固定輪とし外輪２を回転輪としてもよい。この場合には、温度差検出素子１２を内輪１に固定すればよい。また、上記実施形態では、熱起電素子としてペルチェ素子を用いたが、軸受の内部と外部との温度差に応じて起電力を発生する素子であれば、温度差検出素子として採用できる。
さらにまた、図１に示したシール部５,６に替えて、図５に示す芯金３１Ａ,３２Ａとシールリップ３１Ｂ,３２Ｂからなるシール部３１,３２を備え、このシール部３２に温度差検出素子１２を装着してもよい。図５に示すように、シール部３１の基部は外輪２の溝７に固定され、シールリップ３１Ｂは内輪４１の外周面に摺接している。また、シール部３２の基部は外輪２の溝１０に固定され、シールリップ３２Ｂは内輪４の外周面に摺接している。この温度差検出素子１２の内側面１２Ａは、芯金３２Ａの外側面に固定され、かつ、径方向の両端面１２Ｃ,１２Ｄは断熱部材３３,３５を介してシールリップ３２Ｂに装着されている。この構造によれば、内側面１２Ａと外側面１２Ｂとの温度差をより大きくできる。
【００２２】
【発明の効果】
以上より明らかなように、請求項１の発明の転がり軸受によれば、温度差検出素子が熱起電素子からなり、この熱起電素子は、転がり軸受の内部と外部との温度差に応じて起電力を発生し、この発生した起電力が上記温度差を表す信号となる。したがって、この発明によれば、温度センサとしての温度差検出素子に対する電源が不要であるから、温度センサへの電力供給用ハーネスを不要とすることができ、センサに関連する回路を簡単にでき、センサの無線化を図れる。
【００２３】
また、請求項１の発明によれば、シール部に温度差検出素子を配置したことで、上記温度差検出素子でもってシール部の外側の温度と内側の温度との温度差を感知し易くなり、温度差検出精度の向上を図れる。
【００２４】
また、一参考例によれば、固定輪の軌道面の反対側の周面に形成された凹部に温度差検出素子を配置したから、この温度差検出素子は、上記軌道面からの熱が伝達される上記凹部の底の温度と、この凹部の開口側の外部の温度との温度差に応じて起電力を発生する。この発明によれば、上記凹部に上記温度差検出素子を配置したことで、この凹部が存在しない場合に比べて、温度差検出素子を発熱源である軌道面よりに近づけることができ、軸受内部温度をより正確かつ時間差なく検出でき、かつ、凹部の開口側では温度差検出素子が空冷されることとなる。したがって、温度差検出素子が検出する温度差をより大きくすることができ、出力電圧を大きくして、検知感度の向上を図れる。
【図面の簡単な説明】
【図１】 この発明の転がり軸受の実施形態の断面図である。
【図２】 上記実施形態の変形例を部分的に示す側面図である。
【図３】 一参考例を示す側面図である。
【図４】 熱起電素子としてのペルチェ素子の特性を示す図である。
【図５】 上記実施形態のさらにもう１つの変形例を示す断面図である。
【符号の説明】
１…内輪、１Ａ…軌道面、２…外輪、２Ａ…軌道面、３…玉、
５,６…シール部、７…溝、８…凹部、９…シールリップ、
１０…溝、１１…凹部、１２…温度差検出素子、１２Ａ…内側面、
１２Ｂ…外側面、１３…開口。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing provided with a temperature sensor.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, some rolling bearings include a temperature sensor that can detect a temperature rise caused by insufficient lubrication or the like by detecting its own temperature.
[0003]
By the way, in the rolling bearing incorporating this temperature sensor, it is necessary to supply power to this temperature sensor, so a power supply harness is essential. This complicates the circuit for the sensor. In addition, it was an obstacle to wireless sensor.
[0004]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing that can eliminate the need for a power supply harness to a temperature sensor, simplify a circuit related to the sensor, and enable the wireless sensor.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a rolling bearing of the invention of claim 1 includes a rolling element, a rotating wheel and a fixed ring having a raceway surface on which the rolling element rolls,
A temperature difference detection element composed of a thermoelectromotive element that generates an electromotive force according to a temperature difference between the inside and the outside of the rolling bearing;
E Bei a circuit for wirelessly transmitting coupled to said temperature difference detection device, and the electromotive force as a signal representing the temperature difference,
Having a seal for sealing the inside of the rolling bearing;
The temperature difference detecting element is disposed on the seal portion,
The temperature difference detecting element has an uneven cooling fin that is located outside the seal portion in the axial direction and increases a temperature difference between the inside and the outside of the rolling bearing .
[0006]
According to the first aspect of the present invention, the temperature difference detecting element comprises a thermoelectric element, and the thermoelectric element generates an electromotive force according to the temperature difference between the inside and the outside of the rolling bearing, and this generation The generated electromotive force becomes a signal representing the temperature difference. Therefore, according to the present invention, since a power source for the temperature difference detection element as a temperature sensor is unnecessary, a power supply harness to the temperature sensor can be eliminated, and a circuit related to the sensor can be simplified. By providing a circuit that wirelessly transmits the signal, the sensor can be wireless.
[0007]
According to the first aspect of the present invention, since the temperature difference detecting element is arranged in the seal portion, the temperature difference between the outside temperature and the inside temperature of the seal portion is sensed by the temperature difference detecting element. This makes it easier to improve the temperature difference detection accuracy.
[0008]
Further, in the rolling bearing of one reference example , a concave portion is formed on the peripheral surface opposite to the raceway surface of the fixed ring, the temperature difference detecting element is disposed in the concave portion, and the outer surface of the temperature difference detecting element is that it is exposed at the opening side of the recess.
[0009]
According to the second aspect of the present invention, since the temperature difference detecting element is disposed in the concave portion formed on the circumferential surface opposite to the raceway surface of the fixed ring, the temperature difference detecting element receives heat from the raceway surface. An electromotive force is generated according to a temperature difference between the transmitted temperature of the bottom of the recess and the temperature outside the opening of the recess.
[0010]
According to this invention, since the temperature difference detecting element is arranged in the recess, the temperature difference detecting element is used as a heat source as compared with the case where the temperature difference detecting element is arranged on the peripheral surface where the recess does not exist. The temperature inside the bearing can be detected more accurately and without time difference, and the temperature difference detecting element is air-cooled on the opening side of the recess. Therefore, the temperature difference detected by the temperature difference detecting element can be further increased, the output voltage can be increased, and the detection sensitivity can be improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
[0012]
In FIG. 1, the cross section of embodiment of the rolling bearing of this invention is shown. A plurality of the rolling bearings are arranged at a predetermined interval in the circumferential direction between the inner ring 1 which is a rotating wheel, the outer ring 2 which is a fixed ring, and the raceway surface 1A of the inner ring 1 and the raceway surface 2A of the outer ring 2. It has a ball 3 as a rolling element.
[0013]
Seal portions 5 and 6 are arranged at both axial ends between the inner ring 1 and the outer ring 2. For example, grease is sealed between the seal portions 5 and 6 as a lubricant.
[0014]
The base portion 5A of the seal portion 5 is fixed to the groove 7 at one end in the axial direction of the inner peripheral surface of the outer ring 2, and the tip lip 5B has a predetermined minute gap with respect to the concave portion 8 at one end in the axial direction of the outer peripheral surface of the inner ring 1. It is separated. Further, the seal portion 6 has a base portion 6 </ b> A fixed to the groove 10 at the other end in the axial direction of the inner peripheral surface of the outer ring 2, and the tip lip 6 </ b> B against the recess 11 at the other end in the axial direction of the outer peripheral surface of the inner ring 1. A predetermined minute gap is separated.
[0015]
An opening 13 is formed at substantially the center in the radial direction of the seal lip 9 of the seal portion 6, and a temperature difference detecting element 12 composed of a Peltier element as a thermoelectric element is fitted into and fixed to the opening 13. . In this temperature difference detecting element 12, the inner side surface 12A is opposed to the ball 3, and the outer side surface 12B is a cooling fin. A signal line (not shown) is connected to the temperature difference detecting element 12, and the temperature difference detecting element 12 is generated according to the temperature difference between the inside and outside of the bearing sensed by the inner side surface 12A and the outer side surface 12B. Electric power is output to the signal line.
[0016]
In this rolling bearing, the temperature difference detecting element 12 is a Peltier element which is a thermoelectric element, and this temperature difference detecting element 12 generates an electromotive force due to a temperature difference between the inner side surface 12A and the outer side surface 12B. The generated electromotive force becomes a signal representing the temperature difference. As illustrated in FIG. 4, the electromotive force is a value approximately proportional to the temperature difference.
[0017]
Therefore, according to this embodiment, since the temperature difference detecting element 12 is used as the Peltier element, which is a thermoelectric element, power supply to the temperature difference detecting element 12 is unnecessary. The wiring harness can be made unnecessary, the circuit related to the temperature sensor can be simplified, and by providing a circuit for wirelessly transmitting the signal, the temperature sensor can be made wireless.
[0018]
Further, according to this embodiment, the temperature difference detecting element 12 is arranged in the seal portion 6 so that the temperature difference between the outside temperature and the inside temperature of the seal portion 6, in particular, the temperature of the lubricant can be easily detected. Therefore, the temperature difference detection accuracy can be improved. Further, since the outer surface 12B of the temperature difference detecting element 12 is an uneven cooling fin, the temperature difference between the inside of the bearing that is at a high temperature and the outside of the bearing that is at a relatively low temperature can be increased. It becomes easy to detect.
[0019]
In the above embodiment, only one temperature difference detecting element 12 is provided. However, as shown in FIG. 2, a plurality of openings 13 are provided at predetermined intervals in the circumferential direction of the seal lip 9 of the seal portion 6. Alternatively, the temperature difference detecting element 12 may be fitted and fixed in each opening 13. In this case, if the Peltier elements of the plurality of temperature difference detection elements 12 are connected in series, the electromotive force that becomes the output signal can be increased, and therefore the temperature difference detection sensitivity can be improved.
[0020]
Moreover, in the said embodiment, although the temperature difference detection element 12 was fixed to the seal part 6, as shown in FIG. 3, without fixing the temperature difference detection element 12 to the seal part 6, on the outer peripheral surface 2B of the outer ring | wheel 2. A case where the concave portion 15 is formed and the inner side surface 12A of the temperature difference detecting element 12 is fixed to the bottom surface 15A of the concave portion 15 is a reference example. In this case, since the temperature difference detection element 12 is disposed in the recess 15 formed in the peripheral surface 2B on the opposite side of the raceway surface 2A of the outer ring 2, the temperature difference detection element 12 transmits heat from the raceway surface 2A. The electromotive force is generated according to the temperature difference between the temperature of the bottom 15A of the recess 15 and the temperature outside the opening of the recess 15. Further, since the temperature difference detecting element 12 is arranged in the recess 15, the inner side surface 12A of the temperature difference detecting element 12 is made to be a heat source as compared with the case where the temperature difference detecting element 12 is arranged on the outer peripheral surface 2B without the recess 15. The temperature inside the bearing, in particular, the temperature of the raceway surface 2A can be detected more accurately and without time difference, and the outer side surface 12B of the temperature difference detecting element 12 is air-cooled on the opening side of the recess 15. The Rukoto. Therefore, the temperature difference detected by the temperature difference detecting element can be further increased, the output voltage can be increased, and the detection sensitivity can be improved.
[0021]
Moreover, in the said embodiment, although the seal parts 5 and 6 were provided, it may replace with a seal part and may be a sealing board. In the above embodiment, the inner ring 1 is a rotating ring and the outer ring 2 is a fixed ring. However, the inner ring 1 may be a fixed ring and the outer ring 2 may be a rotating ring. In this case, the temperature difference detecting element 12 may be fixed to the inner ring 1. In the above embodiment, the Peltier element is used as the thermoelectric element. However, any element that generates an electromotive force according to the temperature difference between the inside and the outside of the bearing can be employed as the temperature difference detecting element.
Furthermore, in place of the seal portions 5 and 6 shown in FIG. 1, the seal portions 31 and 32 including the core bars 31A and 32A and the seal lips 31B and 32B shown in FIG. The element 12 may be mounted. As shown in FIG. 5, the base portion of the seal portion 31 is fixed to the groove 7 of the outer ring 2, and the seal lip 31 </ b> B is in sliding contact with the outer peripheral surface of the inner ring 41. The base of the seal portion 32 is fixed to the groove 10 of the outer ring 2, and the seal lip 32 </ b> B is in sliding contact with the outer peripheral surface of the inner ring 4. The inner surface 12A of the temperature difference detecting element 12 is fixed to the outer surface of the core metal 32A, and both end surfaces 12C and 12D in the radial direction are attached to the seal lip 32B via heat insulating members 33 and 35. According to this structure, the temperature difference between the inner side surface 12A and the outer side surface 12B can be further increased.
[0022]
【The invention's effect】
As is clear from the above, according to the rolling bearing of the invention of claim 1, the temperature difference detecting element is composed of a thermoelectric element, and the thermoelectric element is in accordance with the temperature difference between the inside and the outside of the rolling bearing. An electromotive force is generated, and the generated electromotive force becomes a signal representing the temperature difference. Therefore, according to the present invention, since a power source for the temperature difference detection element as a temperature sensor is unnecessary, a power supply harness to the temperature sensor can be eliminated, and a circuit related to the sensor can be simplified. Wireless sensor can be achieved.
[0023]
According to the first aspect of the present invention, since the temperature difference detecting element is arranged in the seal portion, the temperature difference between the outside temperature and the inside temperature of the seal portion can be easily detected by the temperature difference detecting element. The temperature difference detection accuracy can be improved.
[0024]
In addition, according to one reference example , the temperature difference detecting element is disposed in the concave portion formed on the circumferential surface opposite to the raceway surface of the fixed ring, so that the heat from the raceway surface is transmitted to the temperature difference detecting element. An electromotive force is generated according to a temperature difference between the temperature of the bottom of the recessed portion and the temperature outside the opening of the recessed portion. According to the present invention, since the temperature difference detecting element is disposed in the recess, the temperature difference detecting element can be brought closer to the raceway surface that is a heat source than when the recess is not present. The temperature can be detected more accurately and without time difference, and the temperature difference detection element is air-cooled on the opening side of the recess. Therefore, the temperature difference detected by the temperature difference detecting element can be further increased, the output voltage can be increased, and the detection sensitivity can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a rolling bearing according to the present invention.
FIG. 2 is a side view partially showing a modification of the embodiment.
FIG. 3 is a side view showing a reference example .
FIG. 4 is a diagram showing the characteristics of a Peltier element as a thermoelectric element.
FIG. 5 is a cross-sectional view showing still another modification of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Inner ring, 1A ... Track surface, 2 ... Outer ring, 2A ... Track surface, 3 ... Ball,
5, 6 ... Seal part, 7 ... Groove, 8 ... Recess, 9 ... Seal lip,
DESCRIPTION OF SYMBOLS 10 ... Groove, 11 ... Recessed part, 12 ... Temperature difference detection element, 12A ... Inner side surface,
12B ... outer surface, 13 ... opening.

Claims (2)

転動体と、この転動体が転動する軌道面を有する回転輪および固定輪と、
転がり軸受の内部と外部との温度差に応じて起電力を発生する熱起電素子からなる温度差検出素子と、
上記温度差検出素子に接続され、かつ上記起電力を上記温度差を表す信号として無線送信する回路とを備え、
転がり軸受の内部をシールするためのシール部を有し、
このシール部に、上記温度差検出素子を配置し、
上記温度差検出素子は、上記シール部の軸方向外方に位置すると共に上記転がり軸受の内部と外部との温度差を増大させる凹凸状の冷却フィンを有することを特徴とする転がり軸受。A rolling element, a rotating wheel and a fixed wheel having a raceway surface on which the rolling element rolls, and
A temperature difference detection element composed of a thermoelectromotive element that generates an electromotive force according to a temperature difference between the inside and the outside of the rolling bearing;
E Bei a circuit for wirelessly transmitting coupled to said temperature difference detection device, and the electromotive force as a signal representing the temperature difference,
Having a seal for sealing the inside of the rolling bearing;
The temperature difference detecting element is disposed on the seal portion,
The rolling bearing according to claim 1, wherein the temperature difference detecting element has an uneven cooling fin that is located outside the seal portion in the axial direction and increases a temperature difference between the inside and the outside of the rolling bearing. 請求項１に記載の転がり軸受において、
上記シール部は、芯金とこの芯金の外側面を被覆するシールリップを備えていると共に上記固定輪の溝に固定され、上記シールリップは上記回転輪に摺接され、
上記温度差検出素子の内側面が上記芯金の外側面に固定され、上記温度差検出素子の径方向両端面が断熱部材を介して上記シールリップに装着されていることを特徴とする転がり軸受。The rolling bearing according to claim 1 ,
The seal portion includes a metal core and a seal lip that covers an outer surface of the metal core, and is fixed to the groove of the fixed ring, and the seal lip is slidably contacted with the rotating wheel,
A rolling bearing characterized in that an inner side surface of the temperature difference detecting element is fixed to an outer side surface of the core metal, and both end surfaces in the radial direction of the temperature difference detecting element are attached to the seal lip via a heat insulating member. .
JP2001310108A 2001-10-05 2001-10-05 Rolling bearing Expired - Fee Related JP4019680B2 (en)

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JP2007138974A (en) * 2005-11-15 2007-06-07 Nsk Ltd Rolling bearing with temperature sensor
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