JP4304983B2 - Bearing device with sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing device with a sensor, and more particularly, to an improvement in a bearing device with a sensor for detecting a rotational speed and a phase state of a rotating body at the same time as supporting the rotating body.
[0002]
[Prior art]
Conventionally, a sensor-equipped bearing device as shown in FIGS. 5 and 6 is known. FIG. 5 shows an overall cross-sectional view of the sensor-equipped bearing device, and FIG. 6 shows a cross-sectional view of the sensor-equipped bearing device of FIG. The sensor-equipped bearing device 30 allows the one end 41 of the sensor 40 to be in direct contact with the reference surface 31a of the stationary bearing ring 31, and the chamfered portion 42 of the sensor 40 is fixed by the notch surface 33 of the sensor holding element 32. A device for positioning the sensor 40 is described (for example, JP-A-10-311740).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-311740
[Problems to be solved by the invention]
The above-described conventional rolling bearing 30 with an information sensor has a problem that the sensor 40 is displaced in the circumferential direction when external force is applied to the connection output unit 34 or the conductor 35 or vibration is applied. . At this time, there is a possibility that an output error of the sensor 40 may occur due to the positional deviation of the sensor 40 in the circumferential direction.
[0005]
Therefore, the above publication also describes that the displacement of the sensor 40 in the circumferential direction is suppressed by insert molding a resin between the sensor holding element 32 and the reference surface 31a of the stationary side race 31. . However, according to resin insert molding or the like, since complicated processing is required, there is room for improvement in terms of increasing manufacturing steps and costs.
[0006]
The present invention has been made in view of the above circumstances, and an object thereof is to easily and highly accurately position a sensor without requiring complicated processing such as resin insert molding. The object is to provide a sensor-equipped bearing device having high detection accuracy at low cost.
[0007]
[Means for Solving the Problems]
The above object of the present invention, keep the rolling bearing in which a plurality of rolling elements held by the holding device is built into rollably between a pair of bearing rings, detects the state of the state or the rolling bearing of the rotary shaft supporting Sensor, an annular sensor cover fixed to one end surface in the axial direction of the stationary side race, and an annular sensor holding member fixed to the sensor cover. The sensor holding member has a plurality of positioning pins. A plurality of fitting holes are formed at respective positions corresponding to the plurality of positioning pins of the sensor cover, and are formed so as to protrude along the axial direction at predetermined intervals in the circumferential direction. There is formed, by the plurality of positioning pins are inserted into the plurality of fitting holes corresponding respectively to the sensor cover and the sensor holding member is positioned, the sensor, the sensor holding member It is achieved by the sensor with a bearing device, characterized in that fitted to the sensor mounting groove provided at a predetermined position along the circumferential direction.
[0008]
According to the bearing apparatus with the sensor, the sensor is fixed to the sensor mounting groove provided on the sensor holding member. In addition, if each positioning pin of the sensor holding member is inserted into the corresponding fitting hole of the sensor cover, the sensor cover and the sensor holding member can be positioned with high accuracy without requiring complicated processing such as insert molding. can do.
[0011]
In the above-described bearing device with a sensor, a plurality of positioning pins are respectively inserted into the plurality of fitting holes, and the tip portions of the plurality of positioning pins penetrating the plurality of fitting holes are plastically deformed, respectively. And the sensor holding member are preferably fixed.
Here, specific examples of plastic deformation include thermal deformation by heating, laser welding, ultrasonic welding, and the like.
If it carries out like this, it will prevent that a positioning pin falls out of a fitting hole by the location deformed plastically. Accordingly, the sensor-equipped bearing device can reliably prevent the sensor from dropping off or being displaced even when an external force such as vibration is applied.
[0012]
In the above-described bearing device with a sensor, the peripheral portions of the plurality of fitting holes form a protrusion protruding toward the sensor holding member, and the sensor cover and the sensor holding member can be engaged only at the protrusion. preferable.
In this way, the engagement pressure around each fitting hole is kept high, and the function of the positioning pin is enhanced.
[0013]
The sensor-equipped bearing device includes a sensor circuit board sandwiched between a sensor cover and a sensor holding member, and a plurality of positioning pins of the sensor holding member are provided at corresponding positions on the circuit board. It is preferable to pass through the through hole and be inserted into each fitting hole.
In this way, the sensor cover and the sensor holding member are positioned, and the positioning pin is inserted into the through hole formed in the circuit board. Therefore, the circuit board is highly accurate between the sensor cover and the sensor holding member. Is positioned and held.
In addition, the sensor cover and the sensor holding member or the circuit board are engaged only at the protrusions at the peripheral edge of the fitting hole. For this reason, it becomes possible to limit the part which a circuit board and a sensor cover contact mutually, for example to parts other than the circuit of a circuit board. Therefore, it is possible to reliably prevent a short circuit due to contact between the circuit board circuit and the sensor cover.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to illustrated embodiments.
FIG. 1 is a cross-sectional view showing a sensor-equipped bearing device according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of the sensor-equipped bearing device of FIG. 1, and FIG. FIG. 4 is an exploded perspective view showing the vicinity of the sensor mounting groove of the sensor holding member, and FIG. 4 is an exploded perspective view showing the sensor cover, sensor holding member, and circuit board of the bearing device.
[0015]
As shown in FIG. 1, the sensor-equipped bearing device 10 includes a plurality of rolling elements 11 respectively held by a cage 14, and is assembled between an inner ring 12 that is a rotating side raceway and an outer ring 13 that is a fixed side raceway. Configured. A sensor 20 is provided on the one axial end surface side (the right end surface side in FIG. 1) of the sensor-equipped bearing device 10.
[0016]
The sensor 20 is fixed to the inner ring (movable raceway) 12 through a sensor body 22 supported by an annular sensor holding member 21, a circuit board 23 described later, and a cored bar 24 made of a magnetic material. A multi-pole magnet (encoder) 25 is provided, and is accommodated in the sensor cover 26.
The multipolar magnet 25 rotates integrally with the inner ring 12. Two Hall ICs are attached to the sensor body 22 with a predetermined angle so that the movement and the number of rotations of the multipolar magnet 25 can be detected. The two Hall ICs are preferably installed so that the phase of the output waveform is 90 ° in electrical angle.
[0017]
As shown in FIG. 2, the sensor cover 26 is formed by, for example, processing a metal plate, which is a magnetic material, into a sheet metal, and includes an annular portion 26a that can accommodate the sensor 20 inside, and one axial end of the annular portion 26a. It is comprised from the flange part 26b provided in the side (left side in FIG. 2), and the side part 26c provided in the axial direction other end side (right side in FIG. 2) of the cyclic | annular part 26a. The sensor cover 26 is fixed to the outer ring 13 by fitting the flange portion 26 b to the outer peripheral edge portion of the outer ring (fixed-side rail wheel) 13 of the rolling bearing 10.
[0018]
The sensor holding member 21 is made of, for example, synthetic resin, has a predetermined elasticity, and is fitted inside the sensor cover 26. At this time, the outer diameter surface of the sensor holding member 21 is fitted to the inner peripheral surface of the sensor cover 26 with a predetermined clearance. As shown in FIG. 4, the sensor holding member 21 is provided with a sensor mounting groove 21a at a predetermined position along the circumferential direction. The sensor mounting groove 21 a is provided with a step portion 21 c that limits the axial position of the sensor body 22. The sensor main body 22 is fitted into the sensor mounting groove 21 a with a predetermined tightening margin (snap engagement) due to elastic deformation of the sensor holding member 21. The sensor body 22 is attached in a state in which the bottom surface 22b, the side surface 22c, and the inclined surface 22d are fitted so as to engage with the corresponding surfaces of the sensor attachment groove 21a. At this time, the sensor main body 22 is attached such that the front end surface 22a slightly protrudes from the surface 21b at the edge of the sensor attachment groove 21a in the sensor holding member 21. For this reason, as shown in FIG. 1, since the front end surface 22a of the sensor 22 approaches the multipolar magnet 25 side of the inner ring 12 in the radial direction, the detection accuracy of the sensor 22 is further improved.
[0019]
As shown in FIGS. 1 to 3, a plurality of positioning pins 27 are provided on the sensor holding member 21 so as to protrude along the axial direction at predetermined intervals in the circumferential direction. The sensor cover 26 is provided with a plurality of fitting holes 26d at predetermined intervals in the circumferential direction. Each positioning pin 27 is inserted into the corresponding fitting hole 26d. Each positioning pin 27 passes through each fitting hole 26d, whereby the sensor cover 26 and the sensor holding member 21 are positioned. The sensor cover 26 and the sensor holding member 21 are fixed to each other by plastically deforming the tip end portion (the right end portion in FIG. 2) of each positioning pin 27 penetrating each fitting hole 26d.
In addition, each front-end | tip part of each positioning pin 27 becomes a hemisphere which has the plane part 27a by plastic deformation. At this time, the flat surface portion 27a is positioned slightly inward (left side in FIG. 2) from the side surface portion 26c of the sensor cover 26. Specific examples of plastic deformation include thermal deformation by heating, laser welding, ultrasonic welding, and the like.
[0020]
A plurality of fitting holes 26d are formed in the sensor cover 26 at positions corresponding to the positioning pins 27 along the axial direction (left and right direction in FIG. 1). The peripheral edge of each fitting hole 26d in the sensor cover 26 forms a protrusion 26e that protrudes to the sensor holding member 21 side (left side in FIG. 1). The protrusion 26e is configured such that the sensor cover 26 and the sensor holding member 21 or the circuit board 23 are engaged with each other and do not come in contact with any place other than the protrusion 26e.
[0021]
1 and 3, the circuit board 23 penetrates the positioning pin 27 of the sensor holding member 21 inserted into the fitting hole 26d of the sensor cover 26 into the through hole 23a drilled at the corresponding position. And is sandwiched between the sensor cover 26 and the sensor holding member 21. An electronic circuit (not shown) for processing a detection signal from the sensor body 22 is mounted on the circuit board 23. The contact part between the circuit board 23 and the sensor cover 26 is limited to a part other than the electronic circuit of the circuit board 23 by a protrusion 26e formed at the peripheral edge of each fitting hole 26d in the sensor cover 26. Thereby, the short circuit by the contact with the electronic circuit of the circuit board 23 and the sensor cover 26 is prevented.
[0022]
The operation of the sensor-equipped bearing device of the present embodiment will be described.
The sensor main body 22 of the sensor 20 is fitted into a sensor mounting groove 21 a provided at a predetermined position along the circumferential direction of the sensor holding member 21 with a predetermined tightening margin due to elastic deformation of the sensor holding member 21. And is positioned easily and with high accuracy. The sensor holding member is fitted inside the sensor cover with a predetermined clearance.
In addition, each positioning pin 27 of the sensor holding member 21 is inserted into the corresponding fitting hole 26d of the sensor cover 26, and the sensor cover 26 and the sensor holding member are not required to perform complicated processing such as insert molding. 21 is positioned with high accuracy.
Further, each positioning pin 27 of the sensor holding member 21 passes through each fitting hole 26d in a state of being fitted and inserted into each fitting hole 26d of the sensor cover 26, and each of the penetrating positioning pins 27 is inserted. Each tip is plastically deformed. Therefore, even when an external force such as vibration is applied, the sensor main body 22 is reliably prevented from falling off or being displaced.
[0023]
Each positioning pin 27 of the sensor holding member 21 passes through a through hole 23 a provided at a corresponding position on the circuit board 23 and is inserted into each corresponding fitting hole 26 d of the sensor cover 26. Therefore, the circuit board 23 is positioned and held between the sensor cover 26 and the sensor holding member 21 with high accuracy.
Further, the peripheral edge of each fitting hole 26d in the sensor cover 26 forms a protrusion 26e protruding toward the sensor holding member 21, and the sensor cover 26 and the sensor holding member 21 or the circuit board 23 are formed only at the protrusion 26e. Are engaged. Therefore, the contact part between the sensor cover 26 and the circuit board 23 is limited to a part other than the electronic circuit of the circuit board 23. Thereby, the short circuit by the contact with the electronic circuit of the circuit board 23 and the sensor cover 26 is prevented reliably.
[0024]
In the sensor-equipped bearing device 10 according to the present embodiment, the sensor main body 22 of the sensor 20 is caused to elastically deform the sensor holding member 21 in the sensor mounting groove 21 a provided at a predetermined position along the circumferential direction of the sensor holding member 21. Are fitted with a predetermined tightening allowance. Therefore, the sensor body 22 can be positioned easily and with high accuracy without requiring complicated processing such as resin insert molding, thereby providing the sensor-equipped bearing device 10 having high detection accuracy at low cost. can do.
[0025]
【The invention's effect】
As described above, according to the present invention, the sensor can be positioned easily and with high accuracy without requiring complicated processing such as resin insert molding, thereby achieving high detection accuracy at low cost. The sensor-equipped bearing device can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a sensor-equipped bearing device according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of the sensor-equipped bearing device of FIG.
3 is an exploded perspective view showing a sensor cover, a sensor holding member, and a circuit board of the sensor-equipped bearing device of FIG. 1. FIG.
FIG. 4 is an enlarged perspective view of a main part showing the vicinity of a sensor mounting groove of a sensor holding member.
FIG. 5 is a cross-sectional view showing a conventional bearing device with a sensor.
6 is a cross-sectional view taken along line AA of the sensor-equipped bearing device of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Bearing apparatus with a sensor 11 Rolling body 12 Raceway (inner ring) of movable side
13 Fixed side race (outer ring)
14 Cage 20 Sensor 21 Sensor holding member 21a Sensor mounting groove 21b Edge face 21c Step 22 Sensor body 22a Tip face 22b Bottom face 22c Side face 22d Inclined face 23 Circuit board 24 Core metal 25 Multipolar magnet 26 Sensor cover 26a Annular part 26b Flange part 26c Side face part 26d Fitting hole 26e Convex part 27 Positioning pin 27a Flat part

Claims (4)

Multiple rolling elements held in the cage keep rolling bearing comprising built into rollably between a pair of bearing rings,
A sensor for detecting the state of the rotating shaft to be supported or the state of the rolling bearing;
An annular sensor cover fixed to one end surface in the axial direction of the stationary-side bearing ring;
An annular sensor holding member fixed to the sensor cover,
A plurality of positioning pins are formed on the sensor holding member so as to protrude along the axial direction at predetermined intervals in the circumferential direction, and correspond to the plurality of positioning pins of the sensor cover. In each position, a plurality of fitting holes are formed,
By inserting the plurality of positioning pins into the corresponding fitting holes, the sensor cover and the sensor holding member are positioned,
The sensor-equipped bearing device, wherein the sensor is fitted into a sensor mounting groove provided at a predetermined position along a circumferential direction of the sensor holding member. The plurality of positioning pins are respectively inserted into the plurality of fitting holes, and the tip portions of the plurality of positioning pins passing through the plurality of fitting holes are plastically deformed, whereby the sensor cover and the sensor The sensor-equipped bearing device according to claim 1, wherein the holding member is fixed . Peripheral portions of the plurality of fitting holes form protrusions protruding toward the sensor holding member, and the sensor cover and the sensor holding member are engaged only at the protrusions. The sensor-equipped bearing device according to claim 1. A circuit board of the sensor is sandwiched between the sensor cover and the sensor holding member, and the plurality of positioning pins of the sensor holding member are through holes provided at corresponding positions on the circuit board. The bearing device with a sensor according to any one of claims 1 to 3 , wherein the bearing device is inserted into each fitting hole .

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