JP2004093254A - Sensor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor device having a simple structure and excellent installability. <P>SOLUTION: This sensor device has a sensor housing, a rotation detection element for detecting the rotational frequency of a rolling device, other detection elements for detecting the state of the rolling device other than the rotational frequency, and a printed circuit board fixed in the sensor housing. The detection element and the other detection elements are fixed on the printed circuit board. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sensor device for detecting an operating state of a rolling device such as a rolling bearing device and a linear motion device.
[0002]
[Prior art]
It is known to detect an abnormality such as separation of a bearing in a rolling device and monitor an operation state. A plurality of sensors such as a rotation detection element, a temperature detection element, and a vibration detection element are used to monitor the operation state, and detect various information of the rolling device. Prior arts in which these plurality of temperature detecting elements are housed inside one sensor housing and arranged on a rolling device include the following.
[0003]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2001-500977 (pages 12 to 13, FIG. 6)
[0004]
FIG. 6 is a diagram corresponding to FIG. 6 of JP-T-2001-500977. According to FIG. 6, the sensor module B includes a speed sensor 110, a temperature sensor 112, and an acceleration sensor 114 inside the hollow shank 104. All three sensors 110, 112, and 114 are held in the correct orientation by the embedding resin inside the shank 104 of the module B.
[0005]
The shank 104 is injection-molded with the sensors 110, 112 and 114 embedded therein, or formed by machining a recess for receiving the sensors 110, 112 and 114. As is clear from FIG. 6, the sensors 110, 112 and 114 are separately fixed inside the shank 104 which is a sensor housing. The output of each sensor is output to the outside via a lead wire 116 attached to each sensor.
[Problems to be solved by the invention]
[0006]
However, according to Japanese Patent Application Laid-Open No. 2001-500977, it is necessary to separately mount and fix the three sensors as described above, so that the assemblability is poor. Further, since the lead wires for transmitting the output signal are connected to the respective sensors, it is necessary to provide a space for arranging the lead wires and to route the wires in the sensor housing.
[0007]
The present invention has been made in consideration of the above problems, and has as its object to provide a sensor device with a simple structure and good assemblability.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a sensor device according to claim 1 of the present invention includes a sensor housing, a rotation detecting element for detecting a rotation speed of a rolling device, and detecting a state of the rolling device other than the rotation speed. And a printed circuit board fixed in a sensor housing, wherein the rotation detection element and the other detection element are fixed to the printed circuit board.
[0009]
According to the above sensor device, the rotation detecting element for detecting the number of rotations of the rolling device and other detecting elements for detecting the state of the rolling device are fixed to the printed circuit board. Therefore, just by housing the printed circuit board in the sensor housing, various sensors are assembled in the sensor housing, and the assemblability is improved.
[0010]
According to a second aspect of the present invention, in the sensor device, the printed board has a component mounting surface on which components are mounted, and the rotation detecting element is fixed at a right angle to the component mounting surface. Therefore, even when there is only a narrow mounting space, it is possible to increase the area of the component mounting surface by lengthening the printed circuit board.
[0011]
The rotation detecting element according to claim 3 is fixed to a permanent magnet fixed on the printed circuit board. Therefore, it is not necessary to prepare a space for separately providing the permanent magnet and the rotation detecting element on the printed circuit board, and it is possible to increase the area of the component mounting surface.
[0012]
Here, the other detecting element is a temperature detecting element for measuring the temperature of the rolling device or a vibration detecting element for detecting vibration of the rolling device. Both the temperature detecting element and the vibration detecting element may be mounted on a printed circuit board.
[0013]
The rolling device is a rolling bearing device. Further, the rolling device is a linear motion device.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a sectional view of a rolling device to which a sensor device according to an embodiment of the present invention is attached. In FIG. 1, the sensor device 20 is mounted on the rolling device 1.
[0016]
The rolling device 1 includes a main shaft 2 that is rotated by a motor (not shown) or the like, and a housing 3 that rotatably holds the main shaft 2 via rolling bearings 10 and 10.
[0017]
Each rolling bearing 10 is formed on an inner ring 12 fitted on the main shaft 2, an outer ring 13 fitted on the housing 3, and an inner ring raceway 12 b formed on an outer peripheral surface of the inner ring 12 and an inner peripheral surface of the outer ring 13. And a plurality of balls 14 as rolling elements disposed between the outer raceway 13b and the outer raceway 13b. The ball 14 is rotatably held by a retainer (not shown).
[0018]
In the vicinity of both ends on the inner peripheral side of the outer ring 13, seals 15 are arranged radially inward. The seal 15 leaks lubricating oil, such as oil and grease, filled in the bearing inner space formed by the inner ring 12, the outer ring 13, the balls 14, and the retainer, and foreign substances from the outside to the bearing internal space. Is preventing.
[0019]
The sensor device 20 is attached to the housing 3. The sensor device 20 includes a sensor housing 21 and a printed board 30 having various sensors and fixed to a board holder 38 (see FIG. 2).
[0020]
The sensor housing 21 has a flange portion 21a and a cylindrical convex portion 21b formed to protrude from the flange portion 21a. Inside the sensor device 20, a hollow portion formed by a cylindrical inner surface 21c is formed. The protrusion 21 b of the sensor device 20 passes through a through hole 3 b formed in a radial direction from the outer surface 3 a of the housing 3, and the tip of the protrusion 21 b faces the main shaft 2. The sensor device 20 is fixed on the outer surface 3a of the housing 3 by a fixing member such as a screw at a flange portion 21a.
[0021]
FIG. 2 is a diagram illustrating a schematic structure of the sensor device 20. A substrate holder 38 holding the printed circuit board 30 is inserted into a hollow portion formed inside the sensor device 20. The substrate holder 38 is closely positioned and fixed on the inner surface 21c of the sensor device 20 by fixing means (not shown). The shape of the substrate holder 38 is configured so as to correspond to the shape of the hollow portion of the sensor device 20, and is configured such that the substrate holder 38 is always fixed at the same position when the substrate holder 38 is inserted.
[0022]
FIG. 3 is a diagram illustrating the printed circuit board 30. The printed circuit board 30 is a substantially rectangular plate-shaped member. The printed circuit board 30 is formed with four fixing holes 30b, and is fixed to the substrate holder 38 by screws 30a via the fixing holes 30b. The printed circuit board 30 has a wiring pattern formed on the surface that is the component mounting surface, and various electronic components and the like are arranged according to the wiring pattern. On the component mounting surface of the printed circuit board 30, a vibration sensor 31, a temperature sensor 32, and a rotation sensor 33 are arranged.
[0023]
Further, a plurality of lead wires 36 for supplying power to the printed circuit board 30 and transmitting a detection signal from the printed circuit board 30 to the outside are connected to the printed circuit board 30. The plurality of lead wires 36 are connected to the cable 25 by crimp terminals, soldering, or the like. The cable 25 may be directly connected to the printed circuit board 30 without being connected to a lead wire. The cable 25 is fixed and sealed by a cable gland sr. The other end of the cable 25 is connected to a power source (not shown), a measuring device, and the like, which are arranged outside. The cable 25 supplies power to the sensor device 20 and sends an output signal from the sensor device 20 to the measuring device. The lead portions of the plurality of lead wires 36 or the cables 25 are sandwiched and positioned between the cable holder 37 and the board holder 38 before being connected to the printed circuit board 30, and are fixed together in a bundle.
[0024]
The vibration sensor 31 is a sensor that outputs a voltage, a charge, or the like according to the vibration direction of the rolling device 1. The vibration sensor 31 includes a displacement, speed, acceleration detection element, and the like. When an acceleration sensor is used as the vibration detecting element, a bimorph-type acceleration sensor supported at both ends, an acceleration sensor having a single-stick structure, a piezoelectric element-type acceleration sensor on a ring, or the like can be used. Further, a plurality of vibration detection elements may be arranged inside the sensor unit. The output of the vibration sensor 31 is sent to a measuring device provided outside via a signal processing circuit wiring pattern formed on the printed circuit board 30, the lead wires 36, and the cable 25.
[0025]
The temperature sensor 32 is a temperature detecting element that measures the temperature of the rolling device 1. The temperature sensor 32 has a predetermined temperature measurement range, and is an element that outputs a current or a voltage corresponding to the temperature of the rolling device 1. As the temperature detecting element, a thermistor, a temperature IC, a temperature measuring resistor made of platinum or the like, a thermocouple, or the like can be used. The output of the temperature sensor 32 is sent to a measuring device provided outside via a signal processing circuit wiring pattern formed on the printed circuit board 30, a lead wire 36, and a cable 25.
[0026]
The rotation sensor 33 is provided near the end of the printed circuit board 30 so as to be located near the tip of the protrusion 21 b of the sensor device 20. The rotation sensor 33 includes a rotation detection element 33a and a permanent magnet 33b. The permanent magnet 33b is a substantially rectangular parallelepiped magnet and is fixed on the printed circuit board 30. The rotation detecting element 33a is arranged on one side surface of the permanent magnet 33b, and is fixed on the printed circuit board 30 via the permanent magnet 33b. The rotation detecting element 33 a is disposed on the permanent magnet 33 b so as to be substantially perpendicular to the plane formed by the printed circuit board 30, and faces the main shaft 2.
[0027]
On the main shaft 2 facing the rotation detecting element 33a, a plurality of protrusions 1b arranged at regular intervals in the circumferential direction are formed as teeth. The permanent magnet 33 b on the printed circuit board 30 has its north pole or south pole directed toward the plurality of convex portions 1 b of the main shaft 2. The intensity of the magnetic field formed by the permanent magnet 33b changes according to a change in the distance accompanying a change in the shape of the main shaft 2. When the main shaft 2 rotates, the distance between the main shaft 2 and the main shaft 2 changes, and with this change, the strength of the magnetic field changes.
[0028]
The rotation detecting element 33a is a magnetic field detecting element that detects a temporal change in the intensity of the magnetic field, and can use a rotation sensor such as a Hall element, a Hall IC, an MR element, and a GMR element. The rotation detecting element 33a detects the temporal change in the intensity of the magnetic field and outputs the detection signal to the wiring pattern of the printed circuit board 30 via the lead wire 33c.
[0029]
The detection signal is sent to a measuring device provided outside via a wiring pattern formed on the printed circuit board 30, the lead wires 36, and the cable 25. Here, an amplifier circuit, a low-pass filter, or the like may be provided on the printed circuit board 30 to amplify the output of the rotation sensor 33, cut out unnecessary frequency components, and then output to the measuring device.
[0030]
Here, the rotation sensor 33 has a configuration including the permanent magnet 33b, but is not limited thereto. For example, when an SN magnetized region for generating a magnetic force is formed periodically on the shaft 2, a permanent magnet is not provided, and the rotation detecting element 33a disposed opposite the SN magnetized region is provided. May be used to measure the time change of the magnetic field formed by the SN magnetization region.
[0031]
Here, the rotation detecting element 33a is positioned on the printed board 30 using a jig or the like before the printed board 30 is arranged inside the housing 21. The rotation detecting element 33a is fixed on the permanent magnet 33b with an adhesive or the like, and the permanent magnet 33b is similarly fixed on the printed circuit board 30 with an adhesive or the like. Thereafter, the lead 33c of the rotation detecting element 33a is lead-formed, and is connected and fixed on the printed circuit board 30 by soldering. When the permanent magnet 33b is not provided, the rotation detecting element 33a may be directly fixed to the printed circuit board 30. Further, in order to simplify the fixing, a jig instead of the permanent magnet 33b made of metal or nonmetal may be used.
[0032]
When the operation of the main shaft of the rolling device 1 is started, each of the sensors 31, 32, and 33 detects the operating state of the rolling device 1 and outputs it to an external measuring device. The measuring device analyzes the vibration data, temperature data, and rotation speed data output from the sensors 31, 32, and 33 by a predetermined analysis method. For example, when any one of vibration data, temperature data, and rotation speed data indicates an abnormal value exceeding a predetermined threshold value, the measuring device issues an alarm and stops the rolling device 1. Control.
[0033]
According to the present embodiment, the vibration sensor 31, the temperature sensor 32, and the rotation sensor 33 are all fixed on the printed circuit board 30. The printed board 30 is fixed to the board holder 38 in a state where the sensors 31, 32, and 33 are connected by a predetermined wiring pattern. The substrate holder 38 is inserted into a hollow portion inside the sensor device 20, and is positioned and fixed on the inner surface 21c. Accordingly, since the sensors 30, 31, and 32 can be positioned and fixed at one time by inserting the substrate holder 38, the assemblability of the sensor device 20 is improved.
[0034]
In addition, since the wiring of each sensor 30, 31, 32 has been completed when each sensor is attached to the printed circuit board 30, there is no need to route leads from each sensor inside the sensor. Therefore, assemblability is better and assembling becomes easier as compared with the case where each sensor is individually attached and wired or each sensor wired in advance is attached.
[0035]
In particular, regarding the positioning of the rotation sensor 33, in the case where the rotation sensor 33 is individually mounted, adjustment in the axial direction is required. Assembly time is greatly reduced.
[0036]
Further, the rotation sensor 33 (the rotation detection element 33a) is disposed at a front end of the printed circuit board 30 at a substantially right angle to the printed circuit board 30. Therefore, it is possible to secure a sufficient space in the longitudinal direction of the printed circuit board 30 (axial direction of the sensor housing 21). Even when the mounting space is narrow, the printed circuit board 30 can be made longer by extending the printed circuit board 30. The mounting area can be increased.
[0037]
The sensor device shown in the present embodiment was used similarly to a rolling device using a ball bearing, but is not limited to this, and a cylindrical roller bearing, a tapered roller bearing, and a rolling device using various double row bearings. May be applied.
[0038]
Further, the sensor device shown in the present embodiment is not limited to a rolling device, but can be applied to a ball screw 80 as shown in FIG. In the ball screw 80, by disposing the sensor device 20 on the nut 81, an initial abnormality such as peeling or a scratch at an engagement portion with the screw shaft 82 and a terminal abnormality such as a rapid temperature rise are detected. be able to. The sensor device 20 is not limited to the nut 81, and may be attached to a fixed-side support unit 83 or a simply-supported support unit 84 that supports the screw shaft 82. The screw shaft 82 is axially fixed to a fixed-side support unit 83 by a lock nut 85, and is rotated by a drive unit 87 coupled via a coupling 86.
[0039]
Further, by attaching the sensor device 20 not only to the ball screw but also to a movable portion or a rail of the linear guide 90 or other linear motion component shown in FIG. Terminal abnormalities such as a rise can also be detected.
[0040]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the sensor apparatus with a favorable structure with a simple structure.
[Brief description of the drawings]
FIG. 1 is a sectional view of a rolling device to which a sensor device according to an embodiment of the present invention is attached.
FIG. 2 is a diagram showing a schematic structure of a sensor device.
FIG. 3 is a diagram illustrating a printed circuit board.
FIG. 4 is a diagram in which a sensor device is applied to a ball screw 80.
FIG. 5 is a view showing a linear guide.
FIG. 6 is a diagram showing a conventional sensor device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 rolling device 2 main shaft 3 housing 10 rolling bearing 20 sensor device 21 sensor housing 30 printed circuit board 31 vibration sensor 32 temperature sensor 33 rotation sensor 33a rotation detection element 33b permanent magnet 38 substrate holder

Claims (6)

A sensor housing,
A rotation detecting element for detecting the number of rotations of the rolling device;
Other detection elements for detecting the state of the rolling device other than the rotation speed,
A printed circuit board fixed in the sensor housing,
The sensor device, wherein the rotation detection element and the other detection elements are fixed to the printed circuit board. The sensor device according to claim 1, wherein the printed board has a component mounting surface on which components are mounted, and the rotation detecting element is fixed at a right angle to the component mounting surface. The sensor device according to claim 1, wherein the rotation detecting element is fixed to a permanent magnet fixed on the printed circuit board. The sensor according to any one of claims 1 to 3, wherein the other detection element is a temperature detection element that measures a temperature of the rolling device or a vibration detection element that detects vibration of the rolling device. apparatus. The sensor device according to any one of claims 1 to 4, wherein the rolling device is a rolling bearing device. The sensor device according to any one of claims 1 to 4, wherein the rolling device is a linear motion device.

Images