JP2003287436A - Detector and rolling device with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detector and rolling device with sensor with excellent vibration resistance, impact resistance, and water resistance, that accurately inform an outside of the state of the rolling device. <P>SOLUTION: The detector 20 detecting the state of the rolling device comprises a print circuit board 27 with a detecting part and an electronic part mounted on, a sensor case 23 accommodating the board 27, a fixture 31 fixing the board 27 to a prescribed position in the case 27, and a cable 38 with one end connected to the board 27 and the other end extended to the outside. The cable 38 is fixed to a fixture 31 or the case 23 in the vicinity of the board 27. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling device with a sensor, and to a bearing device for a moving body such as a railroad vehicle, an automobile or a carrier used for preventive maintenance of mechanical devices, for example, in an environment susceptible to vibration. It is ideal for preventive maintenance of gears and gear boxes. Further, the present invention can be applied to bearing devices used in video information equipment and the like, and further to linear motion parts such as ball screws and linear guides.

[0002]

2. Description of the Related Art Bearing devices for industrial machines, bearing devices for vehicles such as railroad cars and automobiles, or gearboxes are
For maintenance, a detector (sensor unit) equipped with a sensor for detecting vibration, temperature, etc. may be attached. Figure 1
As shown in FIG. 4, in a conventional detector 90, a printed circuit board 97 on which an electronic component 91 including a detection unit such as a temperature sensor and a rotation speed sensor is mounted is provided with a resin 95 in a sensor case 93.
It was fixed in the mold. One end of a cable 98 such as a power cable and a signal cable is directly soldered to the printed board 97, or is connected to the printed board 97 via a relay component such as a connector or a terminal block. The cable 98 may be directly pulled out of the sensor case 93, or a cable gland may be attached to the sensor case 93 and the cable 98 may be pulled out through the cable gland.

[0003]

However, the cable 98
In the case where the is directly soldered to the printed circuit board 97 or the cable 98 is directly pulled out from the sensor case 93, there are the following problems. That is, since the cable 98 is arranged in a free state in the sensor case 93, when a large vibration or shock acts, the acceleration of the vibration or shock also acts on the cable 98, and the cable 98 receives a force. . As a result, a load corresponding to the weight of the cable 98 acts on the printed circuit board 97, and the printed circuit board 97 is cracked by repeated stress, and the cable 98, the connector,
Lands (circuit patterns) for soldering relay parts such as terminal blocks were sometimes peeled off. In addition, the core of the cable 98 may be broken at the portion where the cable 98 is soldered to the printed circuit board 97 due to the repeated action of vibration and impact on the cable 98.

When a cable gland is used for pulling out the cable, from the screw part of the cable gland,
Water sometimes penetrated into the sensor case. The water sometimes caused the circuit to malfunction.

Further, in a bearing device that supports an axle of a railroad vehicle, it is required to monitor a plurality of types of physical quantities such as temperature, vibration, and speed in the bearing portion for maintenance and the like.
Conventionally, a sensor is individually attached to each physical quantity to be monitored. However, in the method of individually mounting the sensor for each physical quantity to be monitored, the configuration around the shaft box becomes complicated, and at the same time, the assembly process increases. Also,
In order to pass the detection signal of each sensor to the measuring device, each sensor is equipped with a connector that is fitted and connected to the detector connecting connector of the measuring device. By unifying the fitting form of the connector with the detector connector of the measuring device regardless of the type of sensor, even if the number of sensors mounted on the bearing increases, diversification of the connector is suppressed and cost is reduced. However, on the other hand, there is a risk of inconvenience such as sensor failure or detection failure due to incorrect connector connection.

The present invention has been made in view of the above circumstances, and an object thereof is excellent in vibration resistance, impact resistance, water resistance, etc., and can accurately inform the state of the rolling device to the outside. Providing a rolling device with a detector and a sensor, and even if the physical quantity to be monitored around the rolling device increases, the configuration becomes complicated and the assembly process increases with the increase in the number of sensors mounted around the axle box. In addition, it is possible to prevent the erroneous connection of the connector to the measuring device, while suppressing the diversification of the connector that connects the sensor of the detector to the measuring device. It is an object of the present invention to provide a detector and a rolling device with a sensor capable of avoiding inconveniences such as failure and detection failure.

[0007]

The object of the present invention is achieved by the following constitution. (1) A detector for detecting a state of a rolling device, which includes a printed circuit board on which a detection unit and electronic components are mounted, a sensor case for housing the printed circuit board, and a predetermined printed circuit board in the sensor case. A fixing jig for fixing in position, and a cable having one end connected to the printed circuit board and the other end extending to the outside, wherein the cable is the fixing jig or the sensor case near the printed circuit board. A detector characterized by being fixed to. (2) A detector for detecting a state of a rolling device, which includes a printed circuit board on which a detection unit and electronic components are mounted, a sensor case for housing the printed circuit board, and a cable gland attached to the sensor case. A cable having one end connected to the printed circuit board via the cable gland and the other end extending to the outside, and the cable gland and a portion of the cable near the cable gland are closely attached outside the sensor case. A detector characterized by being coated with a coating material having properties. (3) The detector according to (1) or (2), wherein the detection unit is at least one of a temperature sensor, a vibration sensor, and a speed sensor. (4) At least one type of sensor is equipped as the detection unit, and the detection signal of each equipped sensor is output to the connector at the cable end pulled out from the detector. Is a detector for outputting a detection signal of each sensor equipped as a detection unit to the measuring device by fitting and connecting the connector at the cable end to the detector connection connector provided at the connector at the cable end. The detector according to (3), characterized in that the form of fitting between the sensor connection connector on the side of the measuring device and the detector connection connector on the side of the measuring device are different depending on the type or combination of the sensors to be equipped. (5) When there is a first detector including a temperature sensor and a vibration sensor as the detection unit and a second detector including a temperature sensor and a speed sensor as the detection unit, the first detector The detector according to the above (4), wherein the detector and the second detector are different from each other in the fitting form of the connector at the cable end pulled out from the detector. (6) A rolling device with a sensor, comprising the detector according to any one of (1) to (5) in a rolling device, and detecting the state of the rolling device by the detector. (7) The rolling device has an outer member, an inner member, and a rolling element arranged between the outer member and the inner member,
One of the outer member and the inner member is a stationary member and the other is a movable member, and the detector is attached to the stationary member or a member fixed to the stationary member. The rolling device with a sensor according to (6) above. (8) When a plurality of rolling devices with a sensor according to (6) or (7) are mounted on the same structural member, the cable end of the cable drawn from the detector of each rolling device with a sensor is For the connector, the mating mode for the detector connector on the measuring device side was changed so that different types or combinations of sensors installed in the detector cannot be mistakenly connected to the detector connector on the measuring device side. A rolling device with a sensor characterized by the above. (9) The rolling device with a sensor according to any one of (5) to (8), wherein the rolling device is a rolling bearing. (10) In the above (5), the rolling device is a ball screw.
Alternatively, the rolling device with the sensor according to any one of (8). (11) The rolling device with a sensor according to any one of (5) or (8), wherein the rolling device is a linear guide.

According to the detector and the rolling device with the sensor having the above structure, since the cable drawn from the printed circuit board is fixed to the fixing jig or the sensor case in the vicinity of the printed circuit board, vibration or impact acts. However, the force corresponding to the weight of the cable is supported by the fixed portion, and the force does not act on the printed circuit board. As a result, the printed circuit board will not be cracked, the land will not be peeled off, and the cable will not be broken even if vibration and shock are repeatedly applied, and the performance of the detector and the rolling device with sensor will be maintained for a long period of time. . Further, when the cable gland and a portion of the cable near the cable gland are covered with a covering material having adhesiveness outside the sensor case, it is possible to remarkably prevent water from entering from the threaded portion of the cable gland. Further, the cable is reinforced and fixed to the cable gland by the covering material. Therefore, the performance of the detector and the rolling device with the sensor is maintained for a long period of time. The "rolling bearing" referred to in (9) above includes a so-called bearing device in which a housing is fitted onto the outer rings of a plurality of rolling bearings.
included.

Further, for example, in the case of detecting a plurality of physical quantities such as temperature, vibration, speed, etc. for the purpose of maintenance of a railroad vehicle axle, the type of sensor built in a bearing box or the like supporting the railroad vehicle axle. Assembling multiple detectors with different
The connectors at the ends of the cables drawn out from the plurality of detectors are fitted and connected to the detector connection connector of the measuring device. In such an application, if the connectors are fitted in the same connector regardless of the type of the built-in sensor, there is a risk of inconvenience such as sensor failure or detection failure due to incorrect connector connection. is there. However, in the detectors shown in (4) and (5) above, the fitting form of the connector differs depending on the type of the sensor to be equipped. Therefore, if the connection destination of the connector is wrong, The mating itself becomes impossible, and the incorrect connection of the connector can be reliably prevented. Therefore, it is possible to avoid occurrence of inconveniences such as sensor failure and detection failure due to incorrect connector connection.

Further, as shown in (3) to (5) and (8) above, in the detector and the rolling device with sensor according to the present invention, one of plural kinds of sensors having different physical quantities to be monitored is detected. The detection signal of each sensor that can be incorporated into a detector and that is incorporated into one detector is sent to the measuring device through a connector having a different fitting form depending on the type or combination of the sensors to be equipped. With the configuration, the detector can reliably pass the detection signals of the plurality of sensors to the measuring device with a single connector. Therefore, compared with the case of the conventional method in which sensors are individually mounted on the bearing box etc. for each physical quantity to be monitored, the number of sensors mounted around the axle box will increase even if the physical quantity to be monitored around the rolling device increases. This is not a factor that causes an increase in the number of connectors, and in practice, by reducing the number of connectors used, it is possible to suppress inconveniences such as complicating the configuration and increasing the assembly process.

Further, the number of types of connectors to be connected to the detector is the same as the number of types or combinations of sensors installed in the detector, but even when various types of sensors are used, a combination pattern of the sensors is provided. If the number of connectors is small, the number of types of connectors actually used is small, and it is possible to reliably prevent erroneous connection of the connector to the measuring device while suppressing diversification of the connector for connecting the sensor of the detector to the measuring device.

In addition, as a rolling bearing for supporting both ends of the railroad vehicle axle, there is provided a railroad vehicle axle support structure using the sensor-equipped rolling device described in (9), wherein one end side of the railroad vehicle axle is supported. The rolling device with sensor for
And a sensor-equipped rolling device that supports the other end of the railroad vehicle axle, and a configuration that includes the second detector described in (5) above. A support structure for a railroad vehicle axle can be provided. In such a railcar axle support structure, there are three types of physical quantities to be monitored for maintenance of the railroad vehicle axles, such as temperature, vibration, and speed, but each detector used is a sensor corresponding to two physical quantities. Since it is common in that the connector is connected, the design of the connector can be facilitated by unifying the number of poles of the connector connected to the detector.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a rolling device with a sensor (bearing device with a sensor) 10 according to a first embodiment of the present invention. The sensor-equipped rolling device 10 includes a pair of rolling bearings (here, ball bearings) 11, 11 arranged at intervals in the axial direction.
A sensor unit (detector) 20 is attached to a rolling bearing device 17 including a housing 18 fitted to the outer rings 12, 12 of the rolling bearing. The shaft 15 is fitted in the inner rings 13, 13 of the rolling bearing. Here, the outer rings 12, 12 and the housing 18
Functions as an outer member and a stationary member, and the inner rings 13, 13
Also, the shaft 15 functions as an inner member and a movable member, and a plurality of rolling elements (here, balls) 14 are arranged between them.

At the end of the shaft 15 inside the housing 18, a speed detecting gear 16 as a member to be detected is provided. The speed detecting gear 16 is made of a magnetic metal material such as steel, and the magnetic characteristics at the outer peripheral edge portion thereof are changed alternately at equal intervals in the circumferential direction. The rotation of the shaft 15 causes the gear 16 to rotate. Gear for speed detection 1
Instead of 6, it is also possible to employ a speed detecting encoder in which magnetic pole portions in which S poles and N poles are alternately magnetized are formed on the outer peripheral surface thereof.

The housing 18 is formed in a cylindrical shape and extends in the axial direction more than one rolling bearing 11 (on the right side in the drawing). The end cover 19 is fixed to the end portion of the housing 18. ing. A mounting hole 18a penetrating an inner surface and an outer surface of the housing 18 is provided at a position of the housing 18 which is axially protruded from one of the rolling bearings 11 and is equivalent to the speed detecting gear 16 in the axial direction. It is provided. The sensor unit 20 is fixed to the housing 18 via the mounting hole 18a.

The sensor unit 20 includes a sensor case 2
3, a case cover 24, and a sensor body 26.
The sensor body 26 is formed by mounting a temperature sensor, a vibration sensor (acceleration sensor), a rotation speed sensor, an electronic component for processing a signal, and the like on a printed circuit board. By mounting the pressure sensor on the printed circuit board, the pressure inside the bearing device 17 can be measured.

FIG. 2 is an enlarged view of the sensor unit 20. As shown in FIG. 2, the sensor case 23 includes a sensor body housing portion 23a formed in a hollow cylindrical shape, and a sensor body housing portion 23a provided at one end side (upper end side in the figure) of the sensor body housing portion 23a. Flange 23 protruding to the outer peripheral side of
b. The flange 23b is used for the housing 18
Placed on the outer surface of. The sensor unit 20 is attached to the housing 18 by the bolt 39 that is inserted into the flange 23b.
Fixed to.

The sensor body housing portion 2 of the sensor case 23
3a includes a speed sensor 28, a temperature sensor 29 mounted on a printed circuit board 27 of the sensor body 26, and a vibration sensor 3
0, an electronic component 34 for processing the signals detected by these sensors 28, 29, 30 is housed. Printed circuit board 2
7 is formed in a rectangular plate shape, and the sensor main body accommodating portion 23a is arranged so that its longitudinal direction and plane direction are parallel to the vertical direction.
It is located inside.

A fixing jig 31 is used to fix the printed board 27 to the sensor case 23. The fixing jig 31 is housed in the sensor body housing 23a,
The sensor body housing portion 23a is fixed in the sensor body housing portion 23a by a fixing screw 32 screwed from the outside (outer peripheral surface) of the sensor body housing portion 23a. The printed board 27 is fixed to the fixing jig 31 by means of board fixing screws 27a.
Here, the fixing jig 31 is the sensor main body housing portion 23a.
Is formed in a columnar shape having a longitudinal direction similar to that of
One side surface (mounting surface) of the fixing jig 31 is fixed to a part of the inner peripheral surface of the sensor body accommodating portion 23a. On the other side surface of the fixing jig 31, a substrate supporting convex portion 31b is provided so as to project. With the printed board 27 placed on the board supporting convex portion 31b, the board fixing screw 27a is fixed to the printed board 27.
And is screwed into the substrate supporting convex portion 31b.

The fixing jig 31 is provided with a cable support portion 31a at the end portion (upper end portion in the figure) on the case cover 24 side. Cable insertion hole 24 of case cover 24
The cable 38 that is inserted through the
In the vicinity of 7, it is fixed to the cable support portion 31 a, and the tip thereof is connected to the printed board 27. here,
A cable 38 is fixed to the cable support portion 31a by a binding band 33 as a fixture. The cable 38 is an integrated illustration of a power cable and a signal cable. The power cable supplies power to the printed circuit board 27, and the signal cable transmits a signal detected by a detection unit such as a temperature sensor, a vibration sensor, and a speed sensor to the outside of the sensor unit 20.

By fixing the cable 38 to the cable support portion 31a by the binding band 33, the force of the weight of the cable 38 under the influence of vibration or impact is supported by the fixing jig 31, and the print is performed. No force acts on the substrate 27. That is, when vibration or impact is applied, a force of F = m · α (m is the mass of the cable; α is acceleration) acts on the cable 38. For example, if the mass of the portion of the cable 38 inside the sensor case 23 is 10 g, then 980 m / s
When an acceleration of ec2 (= 100G) is applied, the cable has F = 0.01 × 980 = 9.8N (= 1kg).
The force of f) acts. When the cable 38 is not fixed by the binding band 33, this force acts on the printed board 27, and bending stress is generated in the printed board 27.
When such vibrations and shocks are repeatedly applied, the printed circuit board 27 may be broken or the printed circuit board 27 of the cable 38 may be broken.
There is a problem such that the soldered part to be broken.

When the cable 38 is fixed to the cable support portion 31a by the binding band 33 as in this embodiment,
The force acting on the cable 38 comes to support the fixing jig 31 and the sensor case 23, and the printed board 27
No force acts on. Therefore, the printed circuit board 27 will not be damaged even if repeated vibrations and impacts are applied. Further, the land is not peeled off and the cable 38 is not broken. These effects are particularly remarkable when the core wire of the cable 38 is thick or when the number of cores of the cable 38 is large.

Further, in this embodiment, the printed circuit board 27 on which the vibration sensor 30 is mounted is mechanically fixed to the sensor case 23 via the fixing jig 31, so that the vibration transmitted to the sensor case 23 is increased. It can be measured with accuracy. The present embodiment is most suitable for a bearing device in which a large vibration or impact acts, such as a bearing device for an axle of a railway vehicle or a rolling mill bearing device.

It should be noted that as the fixing device, a device other than the binding band 33 may be used, and for example, the cable 38 may be fixed to the cable supporting portion 31a or the fixing jig 31 by using a screw or the like. The cable 38 may be fixed to the fixing jig 31 by using the binding band 33 and an adhesive together. Fixing screw 32 for fixing the fixing jig 31 to the sensor case 23
It is preferable that the head does not protrude from the outer peripheral surface of the sensor body housing portion 23a. In addition, it is preferable to mold the vicinity of the head of the fixing screw 32 with a silicone resin or an epoxy resin to form a waterproof structure because water does not enter the inside of the sensor unit.

When the temperature sensor 29 is used as the detecting portion, if a silicon resin or the like having good thermal conductivity is filled between the temperature sensor 29 and the sensor case 23, heat can be transferred more quickly and the temperature can be reduced. It is preferable because accurate measurement can be performed. For the purpose of preventing the printed circuit board 27 from moisture, the surface of the printed circuit board 27 on which the sensor and the electronic component are mounted may be coated with a silicone resin or the like. Further, after fixing the printed circuit board 27 and the fixing jig 31 in the sensor case 23, the printed circuit board 27 and the fixing jig 31 may be molded with a silicone resin or an epoxy resin.

When the epoxy resin having a high hardness is used for molding, it is preferable that the portion of the printed circuit board 27 on which the sensor and the electronic parts are mounted is coated with a soft silicone resin in advance and then is molded with a hard epoxy resin. . Furthermore, it is more preferable to mold in a state where a cushioning material having closed cells is attached onto a silicone resin or the like. The reason is as follows. Generally, stainless steel or aluminum alloy is used as the material of the outer sensor case 23.
7 and the molding material are different from each other in the thermal expansion coefficient of the sensor case 23. Further, the printed circuit board 27 and the molding material often have different coefficients of thermal expansion. Therefore, when the temperature changes, a difference occurs in the thermal expansion amount of the sensor case 23, the molding material, and the printed board 27, and a large force is generated between the respective members due to the difference, and as a result, the electronic component is damaged or solder is soldered. It may peel off. If electronic components are protected in advance with a soft resin such as silicon resin, the soft resin absorbs those dimensional changes due to temperature changes.
Large force does not act on electronic parts and the like, and the above problems do not occur. Furthermore, when a cushioning material having closed cells is attached to the upper surface of the silicone resin, since this cushioning material has closed cells such as Styrofoam, when the pressure inside the molding material rises due to temperature change, The closed cells are compressed, and the deformation can reduce the pressure increase. In this way, damage to the electronic component can be prevented more reliably.

The position where the printed board 27 is fixed to the jig 31 for fixing the printed board 27 by the board fixing screw 27a should be in consideration of the size, thickness or rigidity of the printed board 27 so as not to resonate with the vibration to be detected. It is set appropriately. The printed circuit board 27 using the board fixing screw 27a and an adhesive together
May be fixed to the fixing jig 31, which prevents the substrate fixing screw 27a from loosening. As shown in FIG. 3, the mounting surface of the fixing jig 31 to the sensor body accommodating portion 23a is a cylindrical surface that follows the shape of the inner peripheral surface of the sensor body accommodating portion 23a. The radius of curvature R2 is
It is preferable that the radius of curvature R1 of the inner peripheral surface of the sensor body accommodating portion 23a be slightly larger.

FIG. 4 shows a sensor unit 40 according to the rolling device with a sensor of the second embodiment of the present invention. In the embodiments described below, members having the same configurations and operations as those already described are given the same or corresponding reference numerals in the drawings to simplify or omit the description. In the second embodiment, the printed circuit board 27 on which the detection section and the electronic components are mounted is housed in the sensor body housing section 43 a of the sensor case 43.
Power supply lines and signal lines extending from the cable gland 4
The cable 38 is led out to the outside via the cable 7. The cable gland 47 is provided in the sensor case 43.
Attached to the case cover 44 (screwed in).

Outside the sensor case 43, the cable gland 47 and the portion of the cable 38 near the cable gland 47 are covered with a covering material 48 having adhesiveness. A heat shrinkable tube is preferably used as the covering material 48. It is possible to cover the cable gland 47 and the cable 38 connected thereto with the heat shrinkable tube, and then blow hot air to shrink the tube. It is more preferable to bind the ends of the covering material (heat-shrinkable tube) 48 with binding bands 49, 49 to improve the adhesion of the covering material 48. As shown in FIG.
Of one end (the portion covering the cable 38) and the other end (the portion covering the cable gland 47) of the binding band 49,
It can be tightened with 49, but it may be on one side only.

As the covering material 48, it is preferable to use a waterproof heat-shrinkable tube having an adhesive effect.
An adhesive is applied to the inner surface of the waterproof heat-shrinkable tube, and the adhesive melts when heat is applied. The adhesive causes the heat-shrinkable tube and the cable gland 47 inside the tube to shrink.
The cable 38 can be bonded. Therefore, high waterproofness can be obtained.

As the covering material 48 having adhesiveness,
A self-bonding tape or a heat shrink tape may be used instead of the heat shrink tube. If these are used, the covering material 48
Easy to install. The self-bonding tape is made of butyl rubber and is not coated with an adhesive, but when it is wound around the cable gland 47 and the cable 38 while being stretched 2-3 times, it is integrated with them.

According to the sensor unit 40 having the above structure,
The covering material 48 can remarkably prevent water from entering the inside from the threaded portion of the cable gland 47. Further, the cable 38 is connected to the cable gland 47 by the covering material 48.
It will be reinforced and fixed to.

The present invention is not limited to the above-described embodiment, but can be appropriately modified and improved. For example, the above embodiments may be combined. That is, a portion of the cable in the vicinity of the printed board may be fixed to the fixing jig, and the cable gland and the portion of the cable in the vicinity of the cable gland may be covered with a covering material having adhesion. Further, the rolling bearing in the bearing device 17 is not limited to a ball bearing, and may be a cylindrical roller bearing, a tapered roller bearing, or various double row bearings. Further, the cable 38 may be directly fixed to the sensor case 23 near the printed board 27.

Further, for example, not only the bearing device 17 but also FIG.
The present invention can also be applied to the ball screw 50 as shown in FIG. In the ball screw 50, by attaching the sensor unit 60 to the nut 51, it is possible to detect an abnormality such as separation at the engaging portion between the screw shaft 52 and the nut 51. The mounting partner of the sensor unit 60 is not limited to the nut 51, but may be mounted on the fixed side support unit 53 supporting the screw shaft 52 or the simple support side support unit 54. The screw shaft 52 is axially fixed to the fixed-side support unit 53 by a lock nut 55, and is rotated by a drive motor 57 coupled via a coupling 56. In addition to the ball screw, the sensor unit 60 can be attached to a movable portion or a rail of a linear guide or other directly identical component to detect an abnormality such as peeling.

FIG. 6 is an enlarged vertical sectional view of a sensor unit 70 according to the rolling device with a sensor of the third embodiment of the present invention. In the sensor unit 70, members having the same configurations and functions as the members used in the sensor units 20 and 40 described above are denoted by the same or corresponding symbols in the drawings, and the description will be simplified. Convert or omit.

The sensor unit 70 is provided with a sensor case 73, a case cover 74, a cable gland 47, and a sensor body 26, and like the sensor unit 40 of the second embodiment, the outer ring of the rolling bearing 11 is formed. 12
Is fixed to a cylindrical housing 18 in which The sensor body 26 is formed by mounting a speed sensor 28, a temperature sensor 29, a vibration sensor (acceleration sensor) 30, and an electronic component 34 for processing a signal on a rectangular board-shaped printed board 27.

As shown in FIG. 6, the sensor case 73 is
A sensor body accommodating portion 73b that is formed in a hollow cylindrical shape and accommodates the sensor body 26, and a sensor body accommodating portion 73 that is provided at one end of the sensor body accommodating portion 73b (at the upper end in the figure).
It has a flange 73c protruding to the outer peripheral side of b.
On the surface of the flange 73c opposite to the sensor body accommodating portion 73b side, an annular case cover coupling portion 73a is formed.
Are formed to project.

The sensor body 26 is a printed circuit board 27.
Is arranged in the sensor main body accommodating portion 73b such that the longitudinal direction of is parallel to the vertical direction. Further, the front end portion of the printed circuit board 27 (one end portion in the longitudinal direction; the lower end portion in the figure)
Is in contact with the bottom plate 73d of the sensor body accommodating portion 73b.

To fix the printed circuit board 27 to the sensor case 73, a fixing tool such as a screw may be used as shown in FIG. 2, but in the case of the present embodiment, an epoxy resin or the like (adhesive or the like is used. ) 76. Epoxy resin, etc. 76
In the case of filling, the sensor main body accommodating portion 73b is preferably provided with a guide portion so as to guide the insertion of the printed board 27. When the printed circuit board 27 is fixed by being filled with resin, it is preferable that at least the outer edge of the printed circuit board 27 is in direct contact with the resin. By doing so, the printed circuit board 27 is stably fixed in the sensor body accommodating portion 73b.

At this time, the speed sensor 28, the temperature sensor 29, the vibration sensor 30, and the electronic component 3 on the printed circuit board 27.
4 is mounted on the sensor 28, 29, 30
Also, the electronic component 34 is covered with a foamable resin (coating resin) such as a soft urethane resin or a silicone resin or a silicon sheet having closed cells so that the epoxy resin or the like does not come into direct contact with the electronic component 34, and the outside thereof is filled with an epoxy resin. Is good. By doing this, the sensors 28, 29,
It is possible to prevent breakage of the electronic component 30 and the electronic component 34.

That is, the speed sensor 28, the temperature sensor 29,
In the case of a structure in which a relatively hard resin such as an epoxy resin is in direct contact with the vibration sensor 30 and the electronic component 34, the sensors 2 due to a dimensional change or a pressure change due to a difference in thermal expansion coefficient between the epoxy resin, the printed board 27, and the sensor case 73.
8, 29, 30 and the electronic component 34 may be damaged (particularly when the sensor case 73 is made of a metal material). Therefore, the speed sensor 28, the temperature sensor 29, the vibration sensor 3
0 and the electronic component 34 are protected by a soft silicone resin or a foaming resin to prevent such damage.

On the other hand, when the printed circuit board 27 is fixed to the sensor body accommodating portion 73b with screws, the above problems do not occur. In that case, the printed circuit board 27
Since the printed circuit board 27 can be positioned at the same time as the screws are fixed with screws, the assembly becomes easy. The printed circuit board 27 may be filled with a resin or the like for the purpose of preventing moisture. In this case, a hard resin such as an epoxy resin may be used together with the protective member (coating resin) as described above, or a soft resin may be directly filled. Further, a moistureproof agent may be applied.

When the inside of the sensor case 73 (inside the sensor main body accommodating portion 73b) is filled with resin, if the entire space is filled with resin, there is no place to relax the volume change when the temperature changes, so a space for leaving gas. It is preferable that the part is provided in a part of the sensor case 73. By doing so, even if the volume changes due to the difference in the coefficient of thermal expansion, the volume of the space changes and the pressure in the sensor case 73 does not change so much. Therefore, the speed sensor 28, the temperature sensor 29, and the vibration sensor 3
0 and damage to the electronic component 34 are prevented. If such a space is not provided, a pressure change of several tens of atmospheres or more may occur due to a temperature change.
8, temperature sensor 29, vibration sensor 30, and electronic component 34
May be damaged. The gas filled in the space may be air, but an inert gas such as nitrogen or argon is more preferable in order to prevent oxidation of solder or the like.

A speed sensor 28 is arranged at the center in the width direction at the tip of the printed circuit board 27 (the end on the bottom plate 73d side of the sensor body housing 73b). When the sensor unit 70 is attached to the housing 18 shown in FIG. 1, the speed sensor 28 is arranged close to the speed detecting gear 16 at a position protruding from the inner surface of the housing 18. In this way, the speed sensor 2 is closest to the speed detecting gear 16.
By arranging 8, the speed can be accurately measured. When the shaft 15 rotates, the speed sensor 28 outputs a pulsed speed signal as a voltage or current signal based on the fluctuating magnetic flux (change in the amount of magnetic flux) due to the change in the magnetic characteristics of the speed detecting gear 16.

Slightly above the speed sensor 28 (housing 1
8 side) and the temperature sensor 29 on the side of the printed circuit board 2
It is implemented on 7. The temperature sensor 29 is disposed inside the housing 18, always accurately measures the atmospheric temperature in the bearing device in which the sensor unit 70 is assembled, outputs a temperature signal, and transmits the temperature signal to the electronic component 34. To do. The electronic component 34 processes the output signal of the temperature sensor 29 and outputs it as a voltage or current signal.

The reason why the temperature sensor 29 is arranged inside the housing 18 is that, for example, when the temperature sensor 29 is arranged above the flange 73c, the case cover 74 is exposed to the outside air and is cooled by wind or the like so that the temperature of the housing 18 is reduced. This is because accurate temperature measurement becomes difficult. By disposing the temperature sensor 29 in the sensor main body accommodating portion 73b below the flange 73c as in the present embodiment, the bearing device 1
The temperature of 7 can be measured accurately.

A vibration sensor (vibration detecting element) 30 is mounted on the printed circuit board 27 above the speed sensor 28 and the temperature sensor 29 (on the side of the housing 18). As shown in FIG. 6, the vibration sensor 30 is arranged inside the sensor case 73 near the flange 73c. The position of the vibration sensor 30 is in the axial direction of the sensor main body accommodating portion 73b,
It is preferable to be within a range L2 from the upper surface of the flange 73c to the bottom surface of the sensor body accommodating portion 73b.
More preferably, it is within the range L1 (range of thickness dimension of the flange 73c) from the upper surface to the lower surface of 3c.

The vibration sensor 30 detects vibration acting on the bearing device 17, outputs a vibration signal (value), and transmits the vibration signal (value) to the electronic component 34. Electronic component 34
Processes the vibration signal (value) given from the vibration sensor 30 and outputs it as a voltage signal or a current signal. Since the vibration sensor 30 is disposed in the vicinity of the flange 73c, vibration (horizontal vibration) V2 in the direction of bending the cylindrical sensor body housing portion 73b of the sensor case 73 as shown in FIG. 6 acts. However, it is not affected by the resonance of the sensor body housing portion 73b.

In this embodiment, the surface direction of the printed board 27 is parallel to the vibration measurement direction. The reason is that when the printed circuit board 27 is arranged in a state of being perpendicular to the vibration measuring direction indicated by the arrow V2 in FIG. 6, for example,
This is because a force in the bending direction acts on the printed board 27 and the printed board 27 easily vibrates in the bending direction, and the vibration of the bearing device 17 cannot be accurately measured by the vibration sensor 30. In general, the natural frequency in the bending direction has a lower frequency than the natural frequency in the extending direction. Therefore, when the printed board 27 is arranged in a state perpendicular to the vibration measurement direction, the natural frequency in the bending direction of the printed board 27. May exist in the frequency range of the measurement target, and vibration cannot be measured accurately.

On the other hand, when the printed circuit board 27 is arranged parallel to the vibration measuring direction as shown in FIG. 6, the force acting on the printed circuit board 27 acts as a force in the direction of compression and tension of the printed circuit board 27 having high rigidity. Therefore, the influence of the natural frequency of the printed board 27 in the bending direction is reduced. Further, since the natural frequency of the printed board 27 in the extending direction is higher than the natural frequency of the bending direction, the influence of the natural frequency of the printed board 27 can be easily removed by a low-pass filter or the like. At this time, the vibration detection direction of the vibration sensor 30 is also preferably parallel to the printed board 27. In this embodiment, it is preferable to detect the vibration in the V1 or V2 direction. As described above, it is more preferable to make the detection direction of the vibration sensor 30 parallel to the printed circuit board 27 because vibration in the bending direction of the printed circuit board 27 is not detected.

The speed sensor 28, the temperature sensor 29,
With the vibration sensor 30 preliminarily mounted on the printed circuit board 27, only the power supply and the wiring having the necessary function can be electrically connected to the electronic component 34 by a jumper wire or the like. By connecting the wiring 35, it is possible to use only a single sensor or two sensors. Therefore, even when manufacturing sensor units having different combinations, it is preferable to manufacture only one type of printed circuit board 27.

On the flange 73c of the sensor case 73,
A housing mounting hole 73e and a case cover mounting hole 73f are formed respectively. The housing mounting hole 73e is
The mounting bolt 39 inserted from above is the housing 1
It is used to fix the sensor case 73 to the housing 18 by being screwed into the housing 8. The case cover mounting hole 73f is used to fix the case cover 74 to the sensor case 73 by screwing the assembly bolt 77 inserted from the lower side into the case cover 74.

The assembly bolt 77 inserted into the case cover mounting hole 73f is screwed in from the housing 18 side which is the mounting counterpart surface of the flange 73c, and its head is opposed to the housing 18 with a slight gap. There is. Therefore, even if the assembly bolt 77 becomes loose,
Since the assembly bolt 77 hits the housing 18, it does not move in the loosening direction of the screw, and as a result, the assembly bolt 77 is prevented from falling off.

The sensor body accommodating portion 73 of the sensor case 73
The case cover 74 that covers the upper opening of b is formed in an L shape having a sensor case coupling portion 74a and a cable ground connection portion 74b. Inside the case cover 74,
An L-shaped hole (space) 78 is formed.

An assembly bolt 77 inserted into the flange 73c of the sensor case 73 is attached to the sensor case connecting portion 74a.
Are formed with screw holes 74f, 74f. A fitting hole 74d into which the case cover joining portion 73a of the sensor case 73 is fitted is formed in the center of the sensor case joining portion 74a.

The cable gland connecting portion 74b has a cable gland mounting hole 74 communicating with the upper end of the fitting hole 74d.
c is formed. Cable gland mounting hole 74c
Extends in a direction inclined at a certain angle with respect to the fitting hole 74d (right angle in this embodiment). The wiring 35 extending from the printed board 27 is pulled out upward, and then electrically connected to a cable 38 extending to the outside through a cable gland mounting hole 74c and a straight type cable gland 47. Cable gland connection 74
A female screw portion is formed on the inner peripheral surface of b (that is, the cable gland mounting hole 74c), and a male screw portion 47a formed on the cable gland 47 is screwed into the female screw portion.

Generally, the L-shaped cable gland (not shown) has a larger volume than the straight type cable gland 47. In this embodiment, since the straight type cable gland 47 is used by making the case cover 74 L-shaped, the overall size can be reduced and the cost is lower than when the L-shaped cable gland is used. In the case of a railway vehicle or the like, a luggage carrier, a vehicle compartment floor, and the like are arranged in the upper part of the housing 18, and the space between them is limited. Therefore, when the cable 38 is pulled out above the case cover 74. The workability when attaching / detaching the sensor unit 70 becomes poor, and water easily enters from above. By pulling out the cable 38 laterally as in the present embodiment, the attachment / detachment work of the sensor unit 70 can be easily performed.

In the case of the present embodiment, the case cover 74 having the L-shaped hole 78 is formed in the cable gland mounting hole 7
An injection port 79 is formed through the cover wall portion 74e that intersects with the central axis of 4c, and further has a screw-type plug 83 that closes the injection port 79. This inlet 7
Reference numeral 9 is for filling resin 81, epoxy resin or the like 7 for waterproofing.

In the case of the present embodiment, the plug 83, which has closed the injection port 79 after being filled with the resin 81, is coated with a resin 85 such as a silicone resin on the outside thereof to seal it. The above resins 81 and 85 have a property that they have a predetermined fluidity at the time of filling (or at the time of application) and that they rapidly solidify and lose the fluidity after being filled (or after the application). Preferably, for example, a silicone resin is suitable, but various other adhesive resins (adhesives) can be used.

In the case of the present embodiment, the cable gland 47 and the cable 38 are provided outside the case cover 74.
The cable gland 47 and its vicinity are covered with a covering material 48 having adhesiveness. A heat shrinkable tube is preferably used as the covering material 48. It is possible to cover the cable gland 47 and the cable 38 connected thereto with the heat shrinkable tube, and then blow hot air to shrink the tube. Covering material (heat shrinkable tube) 48
It is more preferable to bind the ends of the above with a binding band 49 to improve the adhesion of the covering material 48.

In the case of a sensor unit in which the cable is attached to the sensor case via the cable gland,
Generally, during long-term use, water may leak inside the sensor unit from a small gap in the screwed part of the cable gland, or water may leak inside the sensor unit from the gap between the cable gland and the cable. In some cases, the infiltration of water deteriorates the insulation of the internal wiring section and corrodes electronic components mounted on the sensor body, causing malfunction. However, in the above-described sensor unit 70, the minute gap in the screwed portion of the cable gland 47 and the gap between the cable gland and the cable are
In either case, after the cable gland 47 was assembled, the inlet 7
Since it is sealed with the resin 81 filled from 9, it is possible to prevent such water infiltration. Therefore,
The water immersion prevention performance of the sensor unit 70 can be stably maintained for a longer period of time, and the operation reliability of the sensor unit 70 can be improved and the service life can be extended.

FIG. 7 is a schematic structural diagram of a structure for supporting a railroad vehicle axle 89 in a railcar bogie 87 using a fourth embodiment of a rolling device with a sensor according to the present invention. The rail car bogie 87 has front and rear axles 89, and each axle 89
Both ends of the trolley frame 87 through the rolling devices 91, 92, 93, 94 with sensors according to the fourth embodiment of the present invention.
It is rotatably supported by a. As shown, each axle 89 is equipped with wheels 95 inside the supporting positions of the rolling devices with sensors 91, 92, 93, 94.

Rolling devices 91, 92, 93, 9 with respective sensors
Reference numeral 4 denotes rolling devices 91a, 92a, 93a, 94a, detectors 91b, 92b, 93b, 94b mounted on the rolling devices 91a, 92a, 93a, 94a, and each detector 9.
Connectors 91c, 92c, 93 connected to the ends of the cables 38 drawn out from 1b, 92b, 93b, 94b
c, 94c.

Each rolling device 91a, 92a, 93a, 94
Reference numeral a designates a rolling bearing in which the axle 89 is press-fitted into the inner ring, and the outer ring is rotatably supported by the bearing housing fixedly mounted on the bogie frame 87a.

Each detector 91b, 92b, 93b, 94b
Is an axle 89 and rolling devices 91a, 92a, 93a, 9
For the maintenance of 4a, rolling devices 91a, 92a, 93
a, 94a are detected by monitoring physical quantities such as temperature, vibration, speed, etc., and concrete configurations are as follows: the sensor units 20, 40, It may be the same as 70.

That is, each of the detectors 91b, 92b, 93b,
Although not shown, 94b is a printed circuit board on which a detection unit and electronic components are mounted, a sensor case for housing the printed circuit board, and a fixing jig for fixing the printed circuit board at a predetermined position in the sensor case. And detectors 91b, 92b, 93b, 9 for outputting detection signals of a sensor mounted on a printed circuit board as a detection unit to the measuring device.
Cable 38 pulled out from 4b and this cable 3
Connectors 91c, 92c, 93c, 9 connected to the eight ends
4c.

The measuring device is the connector 9 at the end of the cable 38.
Predetermined arithmetic processing is performed on the detection signals sent from the 1c, 92c, 93c, and 94c, and the arithmetic processing result is evaluated by comparison with a reference value, etc.
It is determined whether or not there is an abnormality in the operating states of 1a, 92a, 93a, and 94a. Connectors 91c, 92c, 93
Reference characters c and 94c are connectors for transferring the detection signals of the respective sensors sent to the cable 38 to the measuring device by being fitted and connected to the detector connecting connector provided in the measuring device.

Railway vehicle axle 89 and rolling devices 91a, 92
The temperature monitoring for maintenance of the a, 93a, and 94a is required for each bearing that supports the axle 89, but the vibration and speed can be monitored for each axle 89. Therefore, in the case of the present embodiment, the detectors 91b and 92b are provided with a temperature sensor and a vibration sensor as detection units, and the first detector that outputs the detection signals of these sensors to the cable 38 is used. Has been. Further, the detectors 93b and 94b are provided with a second sensor that includes a temperature sensor and a speed sensor as a detection unit and outputs detection signals of these sensors to the cable 38. That is, which of the detectors 91b, 92b, 9
The 3b and 94b are also configured to monitor two types of physical quantities, and connectors 91c, 92c and 9 for passing detection signals to the measuring device.
The numbers of poles of 3c and 94c can be unified.

However, each connector 91c of this embodiment,
Numerals 92c, 93c, and 94c differ from each other in a fitting form (dimension, shape, etc.) with a detector connecting connector (not shown) equipped on the measuring device side according to the type or combination of the equipped sensors. ing.

Specifically, the connectors 91c, 92c,
As shown in FIGS. 8A and 8B, 93c and 94c are
A male connector equipped with a pin terminal (male terminal) 103 as a connection terminal for delivering a detection signal in the connector housing 101, and a male screw portion 102 provided on the outer periphery of the tip of the connector housing 101 is provided on the measuring device side. It is common in that a fitting connection between the connection terminals is realized by screwing the female thread portion. However, the connectors 91c and 92c of the detectors 91b and 92b, which are the first detectors including the temperature sensor and the vibration sensor as the detection unit, use the male screw portion 102 as a 3/4 inch screw and the temperature as the detection unit. Connectors 93c and 94c of detectors 93b and 94b as a second detector including a sensor and a speed sensor
Is a 7/8 inch screw for the male screw portion 102,
Incompatible structure with different fitting form.

The above detectors 91b, 92b, 93b, 9
4b, depending on the type of sensor equipped, the connector 91
c, 92c, 93c, 94c fitting form (male screw part 10
2), the connectors 91c, 9
If the connection destinations of 2c, 93c, and 94c are incorrect, the connector itself cannot be fitted, and the incorrect connection of the connector can be reliably prevented. Therefore, it is possible to avoid occurrence of inconveniences such as sensor failure and detection failure due to incorrect connector connection.

Further, the detectors 91b and 92 of the present embodiment
b, 93b, and 94b, a plurality of types of sensors with different physical quantities to be monitored can be incorporated in one detector, and the detection signal of each sensor incorporated in one detector is the type of the equipped sensor. Or, it is sent to the measuring device via a connector with a different fitting form depending on the combination,
Each of the detectors 91b, 92b, 93b, 94b can reliably pass the detection signals of a plurality of sensors to the measuring device with a single connector. Therefore, compared with the case of the conventional method in which sensors are individually mounted on the bearing box etc. for each physical quantity to be monitored, the number of sensors mounted around the axle box will increase even if the physical quantity to be monitored around the rolling device increases. This is not a factor that causes an increase in the number of connectors, and in practice, by reducing the number of connectors used, it is possible to suppress inconveniences such as complicating the configuration and increasing the assembly process.

Further, the number of types of connectors to be connected to the detectors is the same as the number of types or combinations of sensors provided in the detectors, but even when a wide variety of sensors are used, the combination pattern of the sensors is large. If the number of connectors is small, the number of types of connectors actually used is small, and it is possible to reliably prevent erroneous connection of the connector to the measuring device while suppressing diversification of the connector for connecting the sensor of the detector to the measuring device.

In the railcar axle support structure shown in FIG. 7, the physical quantities to be monitored for maintenance of the railroad vehicle axle 89 are three types: temperature, vibration, and speed. , 92b, 93b, 94b are common in that they are equipped with sensors corresponding to two physical quantities, so that the connector design can be facilitated by unifying the number of poles of the connector connected to the detector.

The difference in the fitting form of the connector for the purpose of preventing the incorrect connection of the connector is not limited to the change of the screw size shown in the above-mentioned embodiment. The difference in fitting form is shown in FIG.
Can be realized by various methods shown in FIG. The connector 110 shown in FIG. 9 is a female connector in which a socket terminal (female terminal) 113 is provided in the connector housing 111 as a connection terminal for delivering a detection signal, and a male screw portion 112 provided on the outer periphery of the tip of the connector housing 111.
By engaging with the female screw portion provided on the measuring device side, the fitting connection between the connection terminals is realized. For example, the female connector 110 and the male connector 101 of FIG. 8 are combined, and the male connector 101 is adopted as the first detector provided with the temperature sensor and the vibration sensor as the detection unit, while the detection is performed. By adopting the female connector 110 for the second detector having the temperature sensor and the speed sensor as a part, it is possible to realize the difference in the fitting form of the connector used for the detector by the male and female connectors. it can.

The method shown in FIG. 10 realizes the difference in the fitting form of the connector used for the detector by changing the size and the number of the positioning keys mounted on the connector.

In the front view of the male connector shown in FIG. 10A, the cylindrical portion 121 at the tip of the connector housing 120 is shown.
Is the first pin terminal 103 housed in the housing.
A key groove 124 having a large width for inserting a positioning key is formed at a position immediately above the position. On the other hand, in the front view of the male connector shown in FIG. 10B, the cylindrical portion 121 at the tip of the connector housing 120 has a position immediately above the first pin terminal 103 housed in the housing and 90 ° from there. A key groove 126 having a small width for inserting a positioning key is formed at two positions separated from each other. In this way, by changing the size and the number of the positioning keys equipped on the connector, it is possible to prevent erroneous connection of the connector. Further, in the above embodiment,
Although the size of the positioning key was changed and the number of equipment was also changed, it is also possible to change the number of equipment only, or to change only the size of the positioning key and shift the key groove phase at the same time. it can.

The method shown in FIG. 11 realizes the difference in the fitting form of the connector used for the detector by changing the phase of the positioning key provided in the connector. In the front view of the male connector shown in FIG. 11 (a), the cylindrical portion 131 at the tip of the connector housing 130 has a position rotated by 90 ° from a position directly above the first pin terminal 133 housed in the housing. There is formed one key groove 134 for inserting the positioning key. On the other hand, in the front view of the male connector shown in FIG.
In the cylindrical portion 131 at the tip of the connector housing 130,
One key groove 134 for inserting a positioning key is formed at a position rotated 180 ° from a position right above the first pin terminal 133 housed in the housing.
In this way, erroneous connection of the connector can be prevented only by changing the phase of the positioning key provided in the connector.

The method shown in FIG. 12 realizes the difference in the fitting form of the connector used for the detector by changing the arrangement of the connection terminals equipped in the connector. 12
In the front view of the male connector shown in (a), in the connector housing 140, with reference to the position of the key groove 144 provided on the cylindrical portion 141 at the tip, four male connectors are provided at 90 ° intervals in the circumferential direction. Pin terminals 143a, 143b, 143c, 1
43d is arranged. However, in the front view of the male connector shown in FIG. 12B, the first pin terminal 143a is
Is located at a position shifted by an angle α from the position right below the position of the key groove 144 to the left. In this way, just changing the arrangement of some of the connection terminals equipped on the connector,
It is possible to prevent incorrect connection of the connector. Also, FIG.
2 shows the case of the male connector, but also in the case of the female connector, erroneous connection can be prevented by changing the arrangement of some of the socket terminals.

The method shown in FIG. 13 is an explanatory view when the difference in the fitting form of the connector used in the detector is realized by the difference in the number of pin terminals provided in the connector. In the front view of the male connector shown in FIG. 13A, four pin terminals 143a, 143b, 143c, 143d are arranged in the connector housing 140 at 90 ° intervals. However, in the front view of the male connector shown in FIG. 13B, the five pin terminals 143a and 143 are spaced at 72 ° intervals.
b, 143c, 143d, 143e are arranged.
In this way, by making the number of pin terminals different, erroneous connection of the connector can be prevented.

In order to prevent erroneous connection of the connector, it is also effective to make the type and color of the cable to which the connector is connected different depending on the type and combination of the sensors equipped in each detector. By combining the measure of changing the type and color of the cable and the measure of changing the fitting form of the connector of the present invention, it is possible to further improve the handleability during the connector connecting operation.

[0082]

As described above, according to the present invention,
It is possible to provide a detector and a rolling device with a sensor that are excellent in vibration resistance, shock resistance, water resistance, etc. and can accurately notify the state of the rolling device to the outside.

Also, since the fitting form of the connector at the cable end of the detector is different depending on the type of the sensor equipped, if the connection destination of the connector is wrong, the fitting of the connector itself is impossible. Therefore, it is possible to surely prevent erroneous connection of the connector. Therefore, it is possible to avoid occurrence of inconveniences such as sensor failure and detection failure due to incorrect connector connection.

Furthermore, the increase in the number of sensors mounted around the shaft box does not cause an increase in the number of connectors, and in reality, the reduction in the number of connectors used results in a complicated structure and an increase in the assembly process. Inconvenience can be suppressed. Further, it is possible to reliably prevent erroneous connection of the connector to the measuring device while suppressing diversification of the connector of the detector.

Further, in the above-mentioned rail vehicle axle support structure, even when the physical quantity monitored for maintenance of the rail vehicle axle is three kinds of temperature, vibration and speed, each detector used has two physical quantities. It is possible to simplify the design of the connector by making it common in that it is equipped with a sensor corresponding to.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a first embodiment of a rolling device with a sensor according to the present invention.

FIG. 2 is an enlarged view of a main part of the rolling device with a sensor shown in FIG.

3 is a cross-sectional view of a detector of the rolling device with a sensor shown in FIG.

FIG. 4 is an enlarged sectional view of an essential part of a second embodiment of a rolling device with a sensor according to the present invention.

FIG. 5 is a diagram showing a ball screw to which the present invention is applied.

FIG. 6 is an enlarged sectional view of an essential part of a third embodiment of a rolling device with a sensor according to the present invention.

FIG. 7 is a schematic configuration diagram of a support structure for a railroad vehicle axle that uses a sensor-equipped rolling device according to a fourth embodiment of the present invention.

8 shows a connector used in the detector of the rolling device with a sensor shown in FIG. 7, (a) is a front view of the connector, and (b) is a longitudinal sectional view of the connector.

FIG. 9 is an explanatory diagram in the case where the difference in fitting form of the connector used for the detector is realized by the male and female connectors in the detector according to the present invention.

FIG. 10 is an explanatory diagram in the case where the detector according to the present invention realizes the difference in the fitting form of the connector used in the detector by changing the size and the number of the positioning keys equipped in the connector. is there.

FIG. 11 is an explanatory diagram in the case where the detector according to the present invention realizes the difference in the fitting form of the connector used in the detector by changing the phase of the positioning key provided in the connector.

FIG. 12 is an explanatory diagram in the case where the detector according to the present invention realizes the difference in the fitting form of the connector used for the detector by changing the arrangement of the connection terminals equipped in the connector.

FIG. 13 is an explanatory diagram in the case where the detector according to the present invention realizes the difference in the fitting form of the connector used for the detector by the difference in the number of pin terminals provided in the connector.

FIG. 14 is a sectional view of a conventional detector.

[Explanation of symbols]

10 bearing device with sensor (rolling device with sensor) 11 rolling bearing 12 outer ring 13 inner ring 15 shaft 17 rolling bearing device (rolling device) 18 housing 20, 40, 60, 70 sensor unit (detector) 23, 43 sensor case 23a Sensor body accommodating portion 23b, 43b Flange 26 Sensor body 27 Printed circuit board 28 Speed sensor 29 Temperature sensor 30 Vibration sensor 31 Fixing jig 35 Wiring 38 Cable 43 Sensor case 44 Case cover 47 Cable gland 48 Cover material 50 Ball screw (roll 73) Sensor case 74 Case cover 76 Epoxy resin etc. (adhesive etc.) 78 L-shaped hole (space) 79 Inlet 81, 85 Resin 83 Plug 87 Railway vehicle bogie 89 Axle 91, 92, 93, 94 Sensor Rolling device 91a, 92a, 93a, 94a Device 91b, 92b, 93b, 94b detector 91c, 92c, 93c, 94c connector

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Takizawa             1-5-50 Kumei, Kugenuma, Fujisawa-shi, Kanagawa             Within NSK Ltd. (72) Inventor Shinichi Shirota             1-5-50 Kumei, Kugenuma, Fujisawa-shi, Kanagawa             Within NSK Ltd. (72) Inventor Koichi Morita             1-5-50 Kumei, Kugenuma, Fujisawa-shi, Kanagawa             Within NSK Ltd. F term (reference) 2F077 VV02 VV10 VV21 VV31 WW03                       WW06                 3J101 AA03 AA42 AA62 AA64 AA65                       BA77 FA22 FA23 FA24 FA26                       GA01 GA11 GA53 GA60

Claims (11)

[Claims] 1. A detector for detecting the state of a rolling device, comprising: a printed circuit board on which a detector and electronic parts are mounted;
A sensor case for accommodating the printed circuit board, a fixing jig for fixing the printed circuit board at a predetermined position in the sensor case, and a cable having one end connected to the printed circuit board and the other end extending to the outside. And the cable comprises
A detector, which is fixed to the fixing jig or the sensor case near the printed circuit board. 2. A detector for detecting a state of a rolling device, the printed circuit board having a detector and electronic parts mounted thereon,
A sensor case accommodating the printed circuit board; a cable gland attached to the sensor case; and a cable having one end connected to the printed circuit board via the cable gland and the other end extending to the outside, A detector characterized in that, outside the sensor case, the cable gland and a portion of the cable near the cable gland are covered with a covering material having adhesiveness. 3. The detector according to claim 1, wherein the detection unit is at least one of a temperature sensor, a vibration sensor, and a speed sensor. 4. The detection unit is equipped with at least one kind of sensor, and a detection signal of each equipped sensor is output to a connector at a cable end pulled out from the detector. A detector that outputs a detection signal of each sensor equipped as a detection unit to the measuring device by fitting and connecting the connector of the cable end to the detector connection connector equipped in the measuring device, wherein the cable end 4. The detector according to claim 3, wherein the connector and the detector-connecting connector on the side of the measuring device are fitted differently depending on the type or combination of sensors equipped. 5. When there is a first detector including a temperature sensor and a vibration sensor as the detection unit and a second detector including a temperature sensor and a speed sensor as the detection unit, The detector according to claim 4, wherein the first detector and the second detector are different in the fitting form of the connector at the cable end drawn out from the detector. 6. A rolling device with a sensor, comprising: the detector according to claim 1 in a rolling device, wherein the detector detects a state of the rolling device. 7. The rolling device includes an outer member, an inner member, and a rolling element arranged between the outer member and the inner member, wherein the outer member and the inner member are 7. The sensor according to claim 6, wherein one of them is a stationary member and the other is a movable member, and the detector is attached to the stationary member or a member fixed to the stationary member. Rolling device. 8. A cable end pulled out from a detector of each rolling device with a sensor when a plurality of rolling devices with a sensor according to claim 6 or 7 are mounted on the same structural member. The connector of is different in the fitting form to the detector connector on the measuring device side so that different types or combinations of sensors equipped in the detector cannot be mistakenly connected to the detector connector on the measuring device side. A rolling device with a sensor characterized by the above. 9. The rolling device with a sensor according to claim 5, wherein the rolling device is a rolling bearing. 10. The rolling device with a sensor according to claim 5, wherein the rolling device is a ball screw. 11. The rolling device with a sensor according to claim 5, wherein the rolling device is a linear guide.