JP2008121863A - Rolling bearing and sensor for rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing a the sensor which can detect the change of an electric resistance value with sufficient accuracy and the sensor for the rolling bearing even if liquid such as water and a chemical is a fine drip in the state of emulsion which is mingled with grease. <P>SOLUTION: In the rolling bearing, the sensor which detects the change of the electric resistance value by contacting with liquid is attached on the circumference facing a bearing space of a stationary race. The sensor has an inner circumferential face, an outer circumferential face and both ends, extends in a circumferential direction along the circumferential face to the bearing space of the stationary race, and has a discontinuous part in which both the ends approach and face each other at one place. The sensor also comprises a detection part which is arranged on the inner circumference face or the outer circumference face, and in which multiple electrodes different in polarity for detecting changes of electric resistance values are alternately arranged so as to approximate to one another, and terminals for taking out the electric resistance values from the detection part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing provided with a sensor capable of detecting the ingress of liquid such as water or chemicals into the bearing, and a sensor for the rolling bearing.

  If liquid enters the inside of the bearing, abnormal conditions such as poor lubrication, generation of rust, and damage due to early flaking of the bearing will occur. The development of a hermetic seal with excellent performance is a market need, but when the use environment of the bearing is bad, for example, in a wheel bearing of an automobile, it may be exposed to unexpected severe environmental conditions, that is, When water gets on the bearing or gets soaked in water, unfortunately a phenomenon of water intruding into the bearing can be seen.

  In such a case, the bearing should be replaced immediately, but it has been difficult for the driver to detect inundation.

There are proposals to solve this problem. (For example, see Patent Document 1)
JP 2005-344931 A

The patent document 1 will be considered.
Patent Document 1 discloses a technique for detecting a change in electrical resistance value between two electrodes using two electrodes.

  However, the water that has passed through the hermetic seal and entered the bearing is usually mixed with grease, which is an electrically insulating material, and mixed in the grease oil as fine water droplets in the form of an emulsion. . Since the water droplets are separated from each other, the insulating state is maintained, and it may be difficult to detect the water droplets in the emulsion state by the technique described in Patent Document 1.

  In order to ensure detection reliability, the water sensor unit of Patent Document 1 needs to be installed at a site that can be detected before the grease and water are mixed.

  That is, it is necessary to provide the water sensor unit at a position adjacent to the hermetic seal inside the axial bearing. This not only restricts the position where the water sensor unit is installed, but also raises the problem that the axial dimension of the bearing increases by the amount of the water sensor unit.

  The present invention has been made in view of such a situation, and the electrical resistance value can be changed even with fine water droplets in which liquid such as invaded water or chemicals is mixed in an emulsion state mixed with grease. It is an object of the present invention to provide a rolling bearing provided with a sensor capable of detecting with high accuracy and a sensor for the rolling bearing.

In order to achieve the above object, the present invention provides:
An outer ring having an inner track,
An inner ring having an outer circumferential track facing the inner circumferential track;
A rolling element interposed between the inner and outer peripheral tracks,
In a rolling bearing provided at both ends of the outer ring and comprising a hermetic seal for sealing a bearing space between the outer ring and the inner ring,
Either one of the outer ring and the inner ring becomes a stationary ring, and a sensor that detects a change in electrical resistance value due to contact with liquid is attached to a peripheral surface facing the bearing space of the stationary ring,
The sensor has an inner peripheral surface, an outer peripheral surface, and both end portions, extends in a circumferential direction along the peripheral surface facing the bearing space of the stationary ring, and the both end portions are close to each other and face each other at one place. Provided with a discontinuous portion, and provided on the inner peripheral surface or the outer peripheral surface, a detection unit in which a large number of electrodes having different polarities for detecting a change in electric resistance value are arranged in close proximity to each other, from the detection unit Provided is a rolling bearing provided with a terminal for taking out a change in electrical resistance value.

The present invention also provides:
An outer ring having an inner track,
An inner ring having an outer circumferential track facing the inner circumferential track;
A rolling element interposed between the inner and outer peripheral tracks,
In a rolling bearing provided at both ends of the outer ring and comprising a hermetic seal for sealing a bearing space between the outer ring and the inner ring,
Either one of the outer ring and the inner ring becomes a stationary ring, and a sensor for detecting a change in electrical resistance value due to contact with liquid is attached to the axial bearing inner surface of the seal seal provided on the stationary ring,
The sensor is an annular flat plate having one plane, the other plane, and both ends in the circumferential direction, and extends in the circumferential direction along the inner surface of the axial bearing of the hermetic seal. A discontinuous portion facing each other in close proximity to each other, provided on the one plane is a detection unit in which a large number of electrodes having different polarities for detecting a change in electrical resistance value are alternately disposed close to each other, There is provided a rolling bearing characterized in that a terminal for taking out a change in electrical resistance value from a detection unit is provided.

The present invention also provides:
A rolling bearing is characterized in that the outer ring is a stationary ring.

The present invention also provides:
The outer ring, which is a stationary ring, has a double row of inner circumferential tracks, the sensor is attached to a central inner circumferential surface between the inner circumferential tracks, and the inner circumferential surface is used as a detection unit. A bearing is an aspect.

The present invention also provides:
The sensor is mounted between the hermetic seal of the outer ring and the inner peripheral raceway, and is a rolling bearing characterized in that the inner peripheral surface is used as a detection unit.

The present invention also provides:
An outer ring having an inner track,
An inner ring having an outer circumferential track facing the inner circumferential track;
A rolling element interposed between the inner and outer peripheral tracks,
Rollers mounted circumferentially along a circumferential surface facing a bearing space of a stationary ring of a rolling bearing, which is provided at both ends of the outer ring and includes a sealing seal that seals a bearing space between the outer ring and the inner ring. A bearing sensor,
The sensor is a flexible substrate having an inner peripheral surface, an outer peripheral surface, and both ends in a circumferential direction, and a plurality of electrodes having different polarities are arranged in close proximity to each other on the bearing space facing surface of the flexible substrate. And a detection part for detecting a change in electrical resistance value and a terminal for taking out the change in the electrical resistance value in the detection part. There is provided a sensor for a rolling bearing, wherein a continuous space is formed and a bearing space facing surface having the detection portion is the inner circumferential surface or the outer circumferential surface.

The present invention also provides:
An outer ring having an inner track,
An inner ring having an outer circumferential track facing the inner circumferential track;
A rolling element interposed between the inner and outer peripheral tracks,
An axial bearing inner surface of the sealing seal provided in a stationary ring of a rolling bearing, which is provided at both ends of the outer ring and seals a bearing space between the outer ring and the inner ring, in a circumferential direction. A sensor for a mounted rolling bearing,
The sensor is an annular flat plate having one flat surface, the other flat surface, and both ends in the circumferential direction, and a plurality of electrodes having different polarities are arranged alternately on one surface of the circular flat plate close to each other. And a detection part for detecting a change in the electric resistance value and a terminal for taking out the change in the electric resistance value in the detection part. There is provided a sensor for a rolling bearing in which a discontinuous portion is formed and the one plane having the detection portion is an inner surface of an axial bearing.

  According to the present invention, a rolling bearing provided with a sensor that can accurately detect a change in electrical resistance value even in the case of fine water droplets in which liquid such as water or chemicals infiltrated is mixed in an emulsion state mixed with grease. In addition, a sensor for a rolling bearing can be provided.

  Embodiments according to the present invention will be described below with reference to the drawings.

  In the description of the embodiment, the vehicle outer end side is referred to as the outer end side, and the vehicle center side is referred to as the center side for the sake of simplicity.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG.

  In the present embodiment, the rolling bearing according to the present invention is used for a drive wheel of a vehicle.

Rolling bearing H ₁ of the present embodiment, the outer ring is a stationary ring, the inner ring 2 is a rotating wheel.

The rolling bearing H ₁ has an outer ring 1 having a first inner peripheral track 11 on the inner periphery on the outer end side and a second inner peripheral track 12 on the inner periphery on the center side, and a hub flange 2f for wheel mounting on the outer end side. An inner ring 2 having a first outer circumferential track 2 a ₁ and a second outer circumferential track 2 b ₁ facing the first inner circumferential track 11 and the second inner circumferential track 12 of the outer ring 1, and the outer ring 1 and the inner ring 2. The outer end side which is attached to both ends of the outer ring 1 and seals the bearing space between the outer ring 1 and the inner ring 2 and is attached to both ends of the balls 3 and 3, the cages 4 and 4 holding the balls 3 and 3, and the outer ring 1. A first sealing seal 5a and a second sealing seal 5b on the center side, and a sensor 7 attached to a central inner peripheral surface between the first inner peripheral track 11 and the second inner peripheral track 12 of the outer ring 1, It is comprised from the grease G with which the bearing space of the outer ring | wheel 1 and the inner ring | wheel 2 is filled.

  Next, each component will be described.

  As described above, the outer ring 1 has a double-row inner circumferential track of the first inner circumferential track 11 and the second inner circumferential track 12 on the inner circumferential surface, and the inner ring is between the first and second inner circumferential tracks. A peripheral surface 15 is formed. The central inner peripheral surface 15 is a peripheral surface facing the bearing space.

An outer peripheral surface, the flange 1f ₀ is provided for attachment to the vehicle body. From the outer periphery to the mounting flange 1f _0, communication holes 16 reaching the central inner peripheral surface 15 is provided. The communication hole 16 is for passing a terminal to be described later. The coupling portion of the flange 1f ₀ for mounting the communication hole 16 countersink portion 17 is applied.

  A cap 18 that covers the communication hole 16 is fitted to the dish pad portion 17. A narrow hole 181 is formed in the center of the cap 18.

  The outer ring 1 has inner peripheral surfaces 1c and 1d at the outer end side end 13 and the center side end 14 respectively. As will be described later, a first seal seal 5a and a second seal seal 5b are attached to the inner peripheral surfaces 1c and 1d, respectively.

The inner ring 2 has a hub flange 2f for wheel mounting on the outer end side, a cylindrical portion 2m is formed from the hub flange 2f toward the center side, and is formed integrally with the cylindrical portion 2m. 2a ₁ , a hub shaft 2ah in which a small-diameter portion 2n continuously provided from the cylindrical portion 2m via the step portion 2c, and a terminal portion 23 provided continuously to the small-diameter portion 2n are formed, and the small-diameter portion 2n. The inner ring element 2b is fitted and fixed to the inner ring element 2b.

The first outer circumferential track 2 a ₁ faces the first inner circumferential track 11 of the outer ring 1.

  The hub shaft 2ah and the inner ring element 2b are fixed in the axial direction between the stepped portion 2c and integrated with the end portion 23 of the hub shaft 2ah that is expanded outward in the radial direction and plastically deformed. ing.

A second outer peripheral track 2b ₁ is formed on the outer periphery of the inner ring element 2b so as to face the second inner peripheral track 12 of the outer ring 1.

  A spline 2 s that is coupled to a drive shaft (not shown) is formed on the inner peripheral surface of the inner ring 2. A predetermined number of wheel mounting hub bolts 9 are mounted on the wheel mounting hub flange 2f.

  The first sealing seal 5a is made of an elastic material, and is attached to the inner peripheral surface 1c of the outer end side end 13 of the outer ring 1 to seal between the hub shaft 2ah and the outer ring 1.

  The second seal 5 b is attached to the center side end 14 of the outer ring 1 and seals between the inner ring element 2 a and the outer ring 1.

  The balls 3 and 3 are rolling elements interposed between the races of the outer ring 1 and the inner ring 2 and support the outer and inner rings so that they can rotate relative to each other.

  The cages 4 and 4 support the balls 3 and 3.

  Grease G is filled in the bearing space between the outer ring 1 and the inner ring 2 and between the double-row balls 3 and 3 and between the balls 3 and the first sealing seal 5a and the second sealing seal 5b. Agitated and circulated between the double row balls and between the hermetic seals on both sides and the balls to function as a lubricant.

Next, the sensor 7 will be described with reference to FIGS.
FIG. 2 shows a flat sensor 7, and FIG. 3 shows a shape of the sensor 7 that is attached to the central inner peripheral surface 15 of the outer ring 1 in a ring shape.

The sensor 7 has a rectangular shape having the other flat surface 73 (corresponding to the back surface of the one flat surface 72 in FIG. 2) on the opposite side to the one flat surface 72 and having end portions 74 and 75 formed at both ends in the longitudinal direction. There is no. A wire made of a current-carrying material is wired on one flat surface 72 of the flexible substrate 71 in the longitudinal direction (circumferential direction in the mounting state described later), and spaced apart in the width direction (axial direction in the mounting state described later). d ₁ and d ₂ are set to be minute, and a large number of electrodes E ₁ and E ₂ having different polarities in a fine stripe shape are alternately formed to form a detection unit.

  A circuit is formed on the flat flexible substrate 71 by, for example, photoetching.

Terminals E ₁₁ and E ₂₁ are taken out from electrodes E ₁ and E _{2 having} different polarities, respectively, and are connected to an ohmmeter R.

Since the separation distances d ₁ and d ₂ between the electrodes are fine, the grease G and water are mixed to become an emulsion state, and energization between the _two electrodes E ₁ and E ₂ occurs even in finely formed water droplets. Thus, it can be confirmed that the resistance value is lowered by the resistance meter R, and the intrusion of water can be detected.

FIG. 3 shows the shape of the sensor 7 described in FIG. 2 attached to the central inner peripheral surface 15 of the outer ring 1. One flat surface 72 on which the electrodes E ₁ and E _{2 of the} flat flexible substrate 71 are formed becomes an inner peripheral surface so as to become a bearing space facing surface, and the other flat surface 73 on the opposite side is the center of the outer ring 1. It is formed in an annular shape and attached so as to be an outer peripheral surface fitted to the inner peripheral surface 15. In the attached state, the electrodes E ₁ and E ₂ are wire-wired in the circumferential direction, and are close to each other with the separation dimensions d ₁ and d ₂ in the axial direction.

One of the flat surfaces 72 serving as the inner peripheral surface serves as a detection portion, extends in the circumferential direction along the central inner peripheral surface 15, and the end portions 74 and 75 of the flexible substrate 71 face each other with a slight distance t therebetween. A discontinuous portion 76 in one circumferential direction is formed in the terminal, and terminals E ₁₁ and E ₂₁ taken out from the electrodes E ₁ and E ₂ are inserted into the communication hole 16 of the outer ring 1, and the outer side of the bearing from the mounting rod 1 f _0. Pull out.

  The other flat surface 73 on which the electrode of the flexible substrate 71 is not formed becomes an outer peripheral surface and is fitted and fixed to the central inner peripheral surface 15.

After the terminals E ₁₁ and E ₂₁ have been pulled out, the cap 18 is fitted into the dish pad portion 17 and hermetically sealed with an adhesive or the like.

Terminals E ₁₁ and E ₂₁ drawn out from the outer peripheral surface of the outer ring 1 are connected to an ohmmeter R attached to the outside of the bearing, connected to a signal processor (not shown), and connected to the signal processor. If the result of the controlled device exceeds the threshold value, an alarm is issued by a signal sent from the control device.

Note that the electrodes E ₁ and E ₂ described in the present embodiment are wired in the circumferential direction and form minute separation dimensions d ₁ and d ₂ in the axial direction. Even if the wiring is arranged in the direction and the minute separation dimensions d ₁ and d ₂ are arranged in the circumferential direction, or the minute separation dimensions d ₁ and d ₂ are formed in the inclination direction and arranged in the inclination direction, the wiring direction It does not matter.

Next, FIG. 4, FIG. 5 (a), the referring to FIG. 5 (b), illustrating the bearing H ₂ rolling a first modification of the present embodiment.

  In the first embodiment, the sensor 7 is attached to the central inner peripheral surface 15 of the outer ring 1. However, in the first modification, the sensor 7 according to the first embodiment is connected to the first sealing seal 5a on the outer end side and the central side. A case where the second seal 5b is attached to the inside of the bearing will be described.

  Since it is the same as that of Embodiment 1 except the thing regarding the attachment site | part of the sensor 7, description is abbreviate | omitted.

The outer end, by 5 is an enlarged view of the Y ₁ parts (a), the center side, by 5 (b) is an enlarged view of a Y ₂ parts, it will be described respectively.

  First, as shown in FIG. 5A, a first sealing seal 5a for sealing the space between the outer ring 1 and the hub shaft 2ah is attached to the inner peripheral surface 1c of the outer end side end 13 of the outer ring 1. .

The first hermetic seal 5a and the cylindrical portion 5a ₁ fitted with the inner circumferential surface 1c of the outer ring 1, the diameter from the flat portion 5a ₂ and the flat portion 5a ₂ are bent toward the cylindrical portion 5a ₁ in the radially inward direction The seal lip 5a ₃ is composed of three seal lips 5a ₃₁ , 5a ₃₂ , 5a ₃₃ formed in order inward in the direction.

  The sensor 7 is attached to the inner peripheral surface 1c between the first sealing seal 5a and the ball 3 adjacent to the first sealing seal 5a, and the ball 3 and the first sealing seal 5a are close to each other. When water enters, the grease G present in the vicinity tends to be in an emulsion state, but in such a case, water intrusion can be easily detected.

Terminals E ₁₁ and E ₂₁ of the sensor 7 are drawn out of the bearing through a communication hole 16 communicating from the inner peripheral surface 1c of the outer ring 1 to the outer peripheral surface, and connected to an ohmmeter R located outside.

  Next, as shown in FIG. 5B, a second sealing seal 5b for sealing the space between the outer ring 1 and the inner ring element 2a is attached to the inner peripheral surface 1d of the center side end portion 14 of the outer ring 1. .

  The sensor 7 is mounted between the second seal seal 5b and the second inner peripheral track 12 adjacent to the second seal seal 5b.

The second sealing seal 5b includes a cylindrical portion 5b ₁₁ fitted to the inner peripheral surface 1d of the outer ring 1, and a flat portion 5b that is bent radially inward from a predetermined position inside the bearing of the cylindrical portion 5b _{11. 12} from three seal lips 5b ₃₁ , 5b ₃₂ , 5b ₃₃ formed by vulcanization and baking in the outer space of the bearing constituted by the core 5b ₁ comprising the cylindrical part 5b ₁ and the cylindrical part 5b ₁₁ and the flat part 5b _12. A seal lip 5b ₃ , a cylindrical portion 5b ₂₂ fitted to the outer peripheral surface 2b ₁₁ of the inner ring element 2b, and a flange 5b ₂₁ bent outward at a right angle from the cylindrical portion 5b ₂₂ on the bearing outer side. It is made from the yoke 5b _2.

  The sensor 7 is adjacent to the second sealing seal 5b and is attached between the second sealing seal 5b and the ball 3, and the ball 3 and the second sealing seal 5b are close to each other and water has entered. In this case, the grease G present in the vicinity tends to be in an emulsion state, but in this case, water intrusion can be easily detected.

  In this modification, the inner peripheral surfaces 1c and 1d of the outer ring 1 are peripheral surfaces that face the bearing space.

The information terminals E ₁₁ and E ₂₁ of the sensor 7 are drawn out of the bearing through a communication hole 16 communicating from the inner peripheral surface 1d of the outer ring 1 to the outer peripheral surface, and connected to an ohmmeter R located outside.

  Next, a second modification of the present embodiment will be described with reference to FIGS. 6 (a) and 6 (b).

  FIGS. 6A and 6B correspond to FIGS. 5A and 5B in Modification 1, respectively.

  FIG. 6A explains the first sealing seal 5a attached to the outer end side end 13 of the outer ring 1 and the sensor 7. The difference from FIG. 5A is as follows. is there.

In FIG. 5A, the sensor 7 is attached to the inner peripheral surface 1 c of the outer ring 1 on the inner side in the axial direction of the first sealing seal 5 a, and the terminals E ₁₁ and E ₂₁ are communication holes provided in the outer ring 1. 16 compared to being pulled outward from, in FIG. 6 (a), the sensor 7 is attached to the inner periphery of the cylindrical portion 5a ₁ of the first hermetic seal 5a, moreover, the plane of the first hermetic seal 5a from the communication hole 5a ₄ which is formed in the part 5a _2, a point being drawn in the axial direction.

  6B is different from FIG. 5B in the following points.

The cylindrical portion 5b ₁₁ of the metal core 5b ₁ fixed to the outer ring 1 of the second sealing seal 5b is provided with an extending portion 5b ₁₃ inward in the axial direction to lengthen the cylindrical portion, and the end on the center side of the cylindrical portion 5b ₁₁ Then, it is folded back inward in the axial direction to form a double cylindrical part, and a flat part 5b ₁₂ of the double cylindrical part bent at a right angle from the substantially central part to the radial inward is provided, and is adjacent to the flat part 5b _12. Te, a structure fitted with a sensor 7 to the inner peripheral surface of the extending portion 5b _13.

In this modification, the inner periphery of the cylindrical portion 5a ₁ of the first hermetic seal 5a is also the inner peripheral surface of the extending portion 5b ₁₃ of the second seal seal 5b is a circumferential surface facing the bearing space, respectively.

The terminals E ₁₁ and E ₂₁ of the sensor 7 are taken out from the bearing hole 5b ₁₄ provided in the flat surface portion 5b ₁₂ and connected to the ohmmeter R.

6 (a) and 6 (b), the terminals E ₁₁ and E ₁₂ are pulled out from the communication holes 5a ₄ and 5b ₁₄ , but, for example, elastic such as rubber forming the seal lips 5a ₃ and 5b ₃ is used. It is necessary to hold the body elastically so that water does not enter through the communication holes 5a ₄ and 5b ₁₄ through the terminals E ₁₁ and E ₁₂ .

  In the modified example 2 described above, the first sealing seal 5a, the second sealing seal 5b, and the sensor 7 are integrated in advance as a unit, so that the handling is convenient and the first sealing seal 5a, the second sealing seal. At the same time as 5b, it can be incorporated into the bearing, and the working efficiency is improved.

  Although the first and second modifications have been described above, the description of the same parts and the same reference numerals as those described above will be omitted.

  Next, Embodiment 2 will be described with reference to FIGS. 7A, 7B, 8, and 9. FIG.

(Embodiment 2)
FIG. 7A and FIG. 7B correspond to FIG. 5A and FIG. 5B, respectively, of the first modification of the first embodiment.

  FIG. 8 is a plan view of the sensor, and FIG. 9 is a cross-sectional view taken along line LL in FIG.

  First, FIG. 7A is different from FIG. 5A as follows.

5A, the sensor 7 is mounted on the inner side of the bearing of the first sealing seal 5a along the inner peripheral surface 1c of the outer ring 1 as compared with the first sealing seal in FIG. 7A. mounted axially bearing the surface _{5a 05} of the flange portion _{5a 03} to the cylindrical portion _{5a 01} fitted with the outer ring inner peripheral surface 1c of the core metal 5a ₀ of 5a are bent at right angles inwardly.

  As a result, as will be described later, the flat surface 72 corresponds to the inner surface of the axial bearing on one side of the sensor 7.

  As shown in FIG. 8, the sensor 7 of the present embodiment is an annular flat plate 71 and forms a discontinuous portion 76 having a distance t at one place in the circumferential direction.

  The sensor 7 is a flexible substrate having an annular flat plate 71 having an annular flat plate 71 having an other flat surface 73 opposite to the flat surface 72 (see FIG. 9) and having end portions 74 and 75 formed in the circumferential direction, respectively. ing.

A wire rod made of a current-carrying material is wired in the circumferential direction on one plane 72 of the annular flat plate 71, and the separation dimensions d ₁ and d ₂ are set minutely close to each other in the radial direction so as to have a fine stripe shape. A large number of electrodes E ₁ and E ₂ having different polarities are alternately formed to form a detection unit. Terminals E ₁₁ and E ₁₂ taken out from the electrodes E ₁ and E ₂ are connected to an ohmmeter R through a communication hole 5a ₀₅ provided in the flat portion 5a ₀₃ of the cored bar 5a ₀ .

  Next, FIG. 7B is different from FIG. 5B as follows.

5 In (b), the sensor 7 in the axial direction inwardly of the second seal seal 5b, compared to attached to the inner circumferential surface 1d of the outer ring 1, 7 (b), the core metal 5b ₁ The detecting portion of the sensor 7 described with reference to FIG. 7A is attached to the flat portion 5b ₁₂ that is the inner surface of the axial bearing toward the inner side of the axial bearing.

  As a result, the detection part of the sensor 7 corresponds to the inner surface of the axial bearing.

The shape of the sensor 7 and the terminals E ₁₁ and E ₁₂ are connected to the ohmmeter R through the communication hole 5b ₁₄ as in FIG. 7A.

Even in this embodiment, when connecting the terminals E ₁₁ and E ₁₂ to the ohmmeter R, for example, after passing through the communication holes 5a ₀₄ and 5b ₁₄ so that water does not enter the terminals, Corresponding to flooding, such as elastically holding the terminals E ₁₁ and E ₁₂ using the elasticity of rubber or the like forming 5a ₃ , is the same as in the second and third modifications of the first embodiment. It is.

  In this embodiment, since the sensor 7 is attached to the inner surface of the axial seal of the hermetic seal, the sensor 7 is close to the submersible position and the detection accuracy is improved.

  In addition, description is abbreviate | omitted about the same site | part demonstrated in Embodiment 1, and the same code | symbol.

Next, the third embodiment will be described with reference to FIGS. 10 and 11.
Figure 11 is an enlarged view of a _{Y 3} parts of Figure 10.

(Embodiment 3)
In this embodiment, the present invention is applied to a hub unit bearing used for a driven wheel of an automobile as shown in FIGS. This figure is a cross-sectional view of the upper half of the XX center line.

Rolling bearing H ₃ of the present embodiment, the outer ring 1 by rotating ring, the inner ring 2 is stationary ring.

An outer ring 1 having double rows of inner circumference tracks 11 and 12 on the inner circumference, an inner ring 2 having outer circumference tracks 2a ₁ and 2b ₁ facing the inner circumference tracks 11 and 12, and balls 3 and 3 interposed between the outer and inner rings. And the retainers 4 and 4 that hold the balls 3 and 3, the outer end side first sealing seal member 5 a, the center side second sealing seal member 5 b, and the inner ring element 2 b on the center side of the inner ring 2. It consists of a sensor 7.

  Next, individual parts will be described.

  As described above, the outer ring 1 includes the double-row inner circumferential tracks 11 and 12 and the hub flange portion 1f that fixes the wheel to the outer end side. Wheel fixing bolts 9 are attached to the hub flange 1f. An inner peripheral surface 1c of the outer end side end portion 13 of the outer ring 1 is a mounting surface of an outer end side first seal seal 5a described later. An inner peripheral surface 1d at the center side end portion of the outer ring 1 is a mounting surface for a second sealing seal 5b described later.

As described above, the inner ring 2 has inner ring elements 2a and 2b each having outer circumferential tracks 2a ₁ and 2b ₁ facing the inner circumferential tracks 11 and 12, respectively, and end portions 2a ₅ and 2b ₅ that are on the inner side of the bearing. It is a structure that hits each other.

  Balls 3 and 3 are rolling elements interposed between the outer and inner rings.

  The cages 4 and 4 hold the balls 3 and 3.

  The outer end side first hermetic seal member 5 a is a lid-like hermetic seal formed from a steel plate, and is fixed to the inner peripheral surface 1 c of the outer ring 1.

In after the first hermetic seal 5a outer end side of the bearing H ₃ rolling is attached to the vehicle, it is attached to the outer ring 1.

The center-side second hermetic seal member 5b includes a core metal 5b ₁ attached to the outer peripheral surface 2b ₁₁ of the inner ring element 2b, an elastic seal lip 5b ₃ vulcanized and bonded to the core metal 5b ₁ , and an outer ring 1 The yoke 5b ₂ is fixed to the inner peripheral surface 1d.

The metal core 5b ₁ includes a cylindrical portion 5b ₁₁ fitted to the inner ring element 2b, and a flat surface portion 5b ₁₂ bent at a right angle outwardly in a radial direction from a predetermined position inside the cylindrical portion 5b _{11 in} the axial direction. Yes.

The flat portion 5b ₁₂ is provided with a drilled communication hole 5b ₁₄ together with an elastic member that is vulcanized and bonded.

The yoke 5b ₂ includes a cylindrical portion 5b ₂₂ that is fitted to the inner peripheral surface 1d of the outer ring 1, and a flange 5b ₂₁ that is bent radially inward from a predetermined position outside the bearing of the cylindrical portion 5b ₂₂ .

The seal lip 5b ₃ is formed in an outer space formed by the cylindrical portion 5b ₁₁ and the flat portion 5b ₁₂ of the core metal 5b ₁ , and is in sliding contact with the yoke 5b ₂ to constitute a hermetic seal.

In the sensor 7, unlike the first embodiment, one flat surface 72 on which the electrodes E ₁ and E ₂ are provided becomes an outer peripheral surface and becomes a detection portion, and the other flat surface 73 becomes an inner peripheral surface and the inner ring element 2b. And is attached in an annular shape.

Sensor 7 is provided between the metal core 5b ₁ and the ball 3 of the second seal seal 5b, it is attached to the outer circumferential surface _{2b 11} of the inner ring element 2b.

The terminals E ₁₁ and E ₂₁ of the sensor 7 are pulled out from the communication hole 5b ₁₄ to the external report and connected to the ohmmeter R.

In the present embodiment, the outer peripheral surface 2b ₁₁ is a peripheral surface facing the bearing space. In addition, one flat surface 72 on which the electrodes E ₁ and E ₂ are formed serves as a bearing space facing surface. Attachment can be performed with an adhesive or the like.

As described above, according to the configurations of the first embodiment, the modified examples, and the second and third embodiments, the electrodes E ₁ that are wired close to each other on the flexible substrate 71 and have a small separation dimension and different polarities. since it provides a sensor for rolling bearings and rolling bearings with a sensor 7 formed of E ₂ in many alternate, it can also be detected accurately with a fine water droplets became emulsion state.

  Further, the present invention is not limited to the contents described in the embodiments and modified examples, but is carried out within the scope of the idea of the present invention.

  In the above description, a ball is used as the rolling element, but the present invention is also applied to a rolling bearing using a tapered roller or a cylindrical roller.

It is sectional drawing which shows Embodiment 1 of this invention. It is explanatory drawing of the sensor of Embodiment 1. FIG. It is explanatory drawing of the sensor of Embodiment 1. FIG. FIG. 6 is a cross-sectional view showing a first modification of the first embodiment. (A) It is a principal part enlarged view of the modification 1. FIG. (B) It is a principal part enlarged view of the modification 1. FIG. (A) It is a principal part enlarged view of the modification 2. FIG. (B) It is a principal part enlarged view of the modification 2. FIG. FIG. 6 is a cross-sectional view showing a second embodiment. It is explanatory drawing of the sensor of Embodiment 2. FIG. It is explanatory drawing of the sensor of Embodiment 2. FIG. 6 is a cross-sectional view showing a third embodiment. FIG. 10 is an enlarged view of a main part of the third embodiment.

Explanation of symbols

H ₁ , H ₂ , H ₃ : Rolling bearing 1: Outer ring 11, 12: Inner circumference raceway 13: Outer end side outer ring end part 14: Center side outer ring end part 15: Central inner peripheral face 1 f ₀ : Mounting rod 2: the inner ring 2a, 2b: inner ring element _2a 1, 2b _1: outer circumferential raceway 2ah: hub shaft _{2b 11:} inner ring element outer peripheral surface 2c: stepped portion 2f: hub flange 2m: cylindrical portion 2n: small diameter portion 3: ball 4: cage 5a : the first hermetic seal 5b: second hermetic seal 7: sensor 71: flexible substrate, an annular platen 72: one plane 73: other plane 74, 75: end _E 1, _{E 2:} electrode _{E 11, E 21} : Terminal G: Grease R: Resistance meter

Claims (7)

An outer ring having an inner track,
An inner ring having an outer circumferential track facing the inner circumferential track;
A rolling element interposed between the inner and outer peripheral tracks,
In a rolling bearing provided at both ends of the outer ring and comprising a hermetic seal for sealing a bearing space between the outer ring and the inner ring,
Either one of the outer ring and the inner ring becomes a stationary ring, and a sensor that detects a change in electrical resistance value due to contact with liquid is attached to a peripheral surface facing the bearing space of the stationary ring,
The sensor has an inner peripheral surface, an outer peripheral surface, and both end portions, extends in a circumferential direction along the peripheral surface facing the bearing space of the stationary ring, and the both end portions are close to each other and face each other at one place. Provided with a discontinuous portion, and provided on the inner peripheral surface or the outer peripheral surface, a detection unit in which a large number of electrodes having different polarities for detecting a change in electric resistance value are arranged in close proximity to each other, from the detection unit A rolling bearing comprising a terminal for taking out a change in electrical resistance value. An outer ring having an inner track,
An inner ring having an outer circumferential track facing the inner circumferential track;
A rolling element interposed between the inner and outer peripheral tracks,
In a rolling bearing provided at both ends of the outer ring and comprising a hermetic seal for sealing a bearing space between the outer ring and the inner ring,
Either one of the outer ring and the inner ring becomes a stationary ring, and a sensor for detecting a change in electrical resistance value due to contact with liquid is attached to the axial bearing inner surface of the seal seal provided on the stationary ring,
The sensor is an annular flat plate having one plane, the other plane, and both ends in the circumferential direction, and extends in the circumferential direction along the inner surface of the axial bearing of the hermetic seal. A discontinuous portion facing each other in close proximity to each other, provided on the one plane is a detection unit in which a large number of electrodes having different polarities for detecting a change in electrical resistance value are alternately disposed close to each other, A rolling bearing provided with a terminal for taking out a change in electric resistance value from a detector.   The rolling bearing according to claim 1, wherein the outer ring is a stationary ring.   The outer ring, which is a stationary ring, has a double row of inner peripheral tracks, the sensor is attached to a central inner peripheral surface between the inner peripheral tracks, and the inner peripheral surface is used as a detection unit. The rolling bearing according to claim 1 or 3.   4. The rolling bearing according to claim 1, wherein the sensor is attached between the hermetic seal of the outer ring and the inner circumferential track, and the inner circumferential surface is used as a detection unit. 5. An outer ring having an inner track,
An inner ring having an outer circumferential track facing the inner circumferential track;
A rolling element interposed between the inner and outer peripheral tracks,
Rollers mounted circumferentially along a circumferential surface facing a bearing space of a stationary ring of a rolling bearing, which is provided at both ends of the outer ring and includes a sealing seal that seals the bearing space between the outer ring and the inner ring. A bearing sensor,
The sensor is a flexible substrate having an inner peripheral surface, an outer peripheral surface, and both ends in a circumferential direction, and a plurality of electrodes having different polarities are arranged in close proximity to each other on the bearing space facing surface of the flexible substrate. And a detection part for detecting a change in electrical resistance value and a terminal for taking out the change in the electrical resistance value in the detection part, wherein the both end parts are close to each other in one circumferential direction. A sensor for a rolling bearing, wherein a bearing space facing surface that forms a continuous portion and has the detection portion is the inner peripheral surface or the outer peripheral surface. An outer ring having an inner track,
An inner ring having an outer circumferential track facing the inner circumferential track;
A rolling element interposed between the inner and outer peripheral tracks,
An axial bearing inner surface of the sealing seal provided in a stationary ring of a rolling bearing, which is provided at both ends of the outer ring and seals a bearing space between the outer ring and the inner ring, in a circumferential direction. A sensor for a mounted rolling bearing,
The sensor is an annular flat plate having one flat surface, the other flat surface, and both ends in the circumferential direction, and a plurality of electrodes having different polarities are arranged alternately on one surface of the circular flat plate close to each other. And a detection part for detecting a change in the electric resistance value and a terminal for taking out the change in the electric resistance value in the detection part. A sensor for a rolling bearing, wherein a discontinuous portion is formed and the one plane having the detecting portion is an inner surface of an axial bearing.

Images