JP2003194048A - Rolling bearing with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing fitted internally with a plurality of sensors and capable of shortening the bearing dimension widthwise. <P>SOLUTION: The rolling bearing is equipped with an inner ring 12, outer ring 11, rolling elements 13 interposed between them, and a plurality of sensors 17, 18, 19 mounted on the inner ring and outer ring on their one side in the axial direction, wherein the sensors are located in the same position in the axial direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing with a sensor provided with a sensor for detecting the number of revolutions and the like.

[0002]

2. Description of the Related Art Conventionally, as a rolling bearing with a sensor, for example, Japanese Patent Application Laid-Open No. 63-111416 and Japanese Patent Application Laid-Open No. 7-32.
There is one disclosed in Japanese Patent No. 5098.

In the rolling bearing with a sensor disclosed in the above-mentioned Japanese Patent Laid-Open No. 63-111416, a magnetic film magnetized in a certain pattern is provided on either one of the facing surfaces of the inner ring and the outer ring. On the other hand, a magnetic sensor is attached. A plurality of patterns of magnetized portions are provided in the magnetic film in the circumferential direction.

The rolling bearing with a sensor disclosed in Japanese Patent Laid-Open No. 325098/1995 has a magnetizing portion on a rotating wheel and a magnetic sensor on a stationary wheel in the same manner as in the above-mentioned Japanese Patent Publication. The space between the magnetized portion and the sensor is increased by increasing the space between them.

In such a rolling bearing with a sensor, the outer ring is usually press-fitted into a predetermined housing (not shown),
The inner ring is used by being fitted onto a predetermined shaft (not shown).

[0006]

Generally, since the gap between the facing surfaces of the inner ring and the outer ring of the bearing is small, the sensor and the detected portion facing the sensor must be thinly formed. However, since the sensor is provided integrally with the substrate on which it is attached, it is difficult to reduce its thickness beyond a certain limit. In order to form a thin portion on the detected part, in JP-A-63-111416, a magnetic film integral with the inner ring or the outer ring is provided, but a special technique is required to form such a film. Is required, which causes an increase in manufacturing cost. Further, the above-mentioned JP-A-7-325098
In the publication, the gap between the inner and outer races is widened to simplify the structure of the magnetic sensor and the detected portion. However, when mounting a plurality of sensors, the entire bearing is arranged in parallel in the axial direction. The width dimension of is increased. The present invention has been made in view of the above circumstances, and an object thereof is to provide a sensor-equipped rolling bearing in which a plurality of sensors are built in a bearing and the widthwise dimension of the bearing can be shortened.

[0007]

The object of the present invention is achieved by the following constitution. (1) An inner race, an outer race, a rolling element interposed between the inner and outer races, and a plurality of sensors provided on one axial side of the inner and outer races, wherein the plurality of sensors are provided at the same axial position. A rolling bearing with a sensor, which is arranged. (2) The above-mentioned (1) further provided with a detected member which is arranged at an axial position equivalent to the plurality of sensors and which is sensed by at least one of the plurality of sensors radially opposed to the plurality of sensors. Rolling bearing with sensor. (3) The rolling bearing with a sensor according to (2), wherein the member to be detected is formed in an annular shape and both the outer diameter surface and the inner diameter surface are sensed by any one of the plurality of sensors. (4) The rolling bearing with a sensor according to (3), in which magnetized portions having different magnetizing patterns are formed on the outer diameter surface and the inner diameter surface of the detected member. (5) The rolling bearing with a sensor according to any one of (1) to (4), wherein the plurality of sensors are arranged so as to be displaced in the circumferential direction. (6) The rolling bearing with a sensor according to any one of (1) to (5), wherein a seal structure is provided between the plurality of sensors and the rolling element when viewed in the axial direction of the inner and outer rings. . (7) The above-mentioned (1) to (6) including a magnetic sensitive sensor, a temperature sensor, and a vibration sensor as the plurality of sensors.
A rolling bearing with a sensor according to any one of 1.

According to the rolling bearing with a sensor having the above structure, since the plurality of sensors and the detected members are arranged at the same position in the axial direction of the inner and outer rings, the width dimension (axial dimension) of the bearing is increased. No need. In this way, a plurality of sensors can be incorporated without changing the load capacity of the bearing and the width and diameter dimensions. Since the dimensions can be made comparable to conventional products, it can be mounted on an existing shaft or housing when mounting the bearing, and the bearing's original performance such as bearing life and rotation accuracy is not impaired at all.

In the above structure, the outer diameter surface of the detected member
If both inner diameter surfaces are sensed, a plurality of signals can be detected using the detected member without increasing the width dimension of the bearing. When magnetized parts with different magnetized patterns are formed on the outer diameter surface and the inner diameter surface of the detected member, for example, one pattern of the magnetized parts is used to detect the rotation speed and the other pattern is used to detect the phase. Can be used. Also,
By arranging a plurality of sensors offset in the circumferential direction of the inner and outer rings
It is possible to deal with the case where the space between the inner and outer rings is narrow, and it is possible to reduce the diameter of the bearing. Further, by providing the seal structure between the rolling element and the plurality of sensors, malfunction of the sensor due to leakage of lubricant from the rolling element side can be prevented. It is preferable to provide a seal structure on both the sensor side and the non-sensor side of the rolling element, which makes it unnecessary to particularly increase the amount of the lubricant filled in the bearing. As the seal structure, a known one such as a non-contact type or a contact type seal member can be used.
Including magnetic sensitive sensor, temperature sensor, vibration sensor,
For example, a magnetic sensor can detect the rotational speed and rotational phase, a temperature sensor can detect abnormal temperature rise of the bearing, and a vibration sensor can detect abnormal vibration of the bearing, so that a plurality of factors can be managed.

[0010]

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 bearing 10 with a sensor according to a first embodiment of the present invention. In the rolling bearing with sensor 10, a plurality of balls (rolling elements) 13 are interposed between an outer ring 11 and an inner ring 12. The plurality of balls 13 are rotatably held by a cage 13a with a space in the circumferential direction. Here, the outer ring 11 is a stationary wheel and the inner ring 12 is a rotating wheel.

A pair of shields 14 and 15 as a seal structure are provided on one side of the ball 13 in the axial direction (left side in the figure) and on the other side in the axial direction (right side in the figure). Each of the shields 14 and 15 has a base end portion (outer peripheral portion) fixed to the outer ring 11. The respective tip portions (inner peripheral portions) of the shields 14 and 15 are not in contact with the inner ring 12, and the shields 14 and 15 are non-contact type seal members.
The shields 14 and 15 include a ball 13, an outer ring 11 and an inner ring 12
Prevent the leakage of the lubricant enclosed between. for that reason,
There is no need to increase the amount of lubricant to be enclosed more than necessary.
Further, the shields 14 and 15 prevent foreign matter such as dust from entering the inside of the bearing. Further, the shield 15 on the right side of the drawing prevents the lubricant from leaking from the ball 13 side and malfunctions of the sensors 17, 18 and 19 described later.

The outer ring 11 has a main body portion 11a that rotatably supports the balls 13 and the base end portions of the shields 14 and 15 are fixed, and an extension portion 11b that is adjacent to the main body portion 11a in the axial direction. ing. Here, the outer diameter surface of the extension portion 11b is flush with the outer diameter surface of the main body portion 11a.
A recessed step portion 11c is provided on the inner diameter surface of b. Although the center of the rolling element 13 is arranged at the axial center position C1 of the main body portion 11a, the axial center position C1 of the main body portion 11a.
Is offset from the axial center position C2 of the entire outer ring 11 including the extension 11b. The base end portion of the holding member 16 is fixed to the step portion 11c of the extension portion 11b.

The holding member 16 is a thin plate having a U-shaped cross section. The holding member 16 includes a first plate portion 16a fixed to the stepped portion 11c and a second plate portion 16b arranged at a distance in the radial direction on the first plate portion 16a.
Connected through. First and second plate portions 16a, 16
Between b, the vibration sensor 1 from the outer ring 11 side (upper side in the figure)
7 and the temperature sensor 18 are fixed. Also,
The magnetic sensitive sensor 19 is provided on the inner ring 12 side of the second plate portion 16b.
Is fixed to the second plate portion 16b via the mold resin member 20.

The vibration sensor 17, the temperature sensor 18, and the magnetic sensitive sensor 19 are connected to the external wiring 2 at the connecting portion 16c.
1 are electrically connected to external control circuits independently of each other. The vibration sensor 17 is arranged near the outer ring 11. The vibration sensor 17 is used to detect abnormal vibrations of the bearing and its associated equipment by converting the vibration component applied to the outer ring 11 into an electric signal and transferring the electric signal to the control circuit. Temperature sensor 18 is ball 1
3. The atmospheric temperature data around the outer ring 11 and the inner ring 12 is constantly detected and given to the control circuit so as to prevent seizure due to running out of lubricant or the like. The magnetic sensitive sensor 19 is arranged so as to face a multi-pole magnet 22 described later in a non-contact manner, generates a pulsed electric signal by the magnetic force generated by the multi-pole magnet 22, and transfers the pulse-shaped electric signal to the control circuit. It is used to detect the rotation speed, rotation direction, and phase.

The vibration sensor 17, the temperature sensor 18, and the magnetic sensitive sensor 19 are radially arranged at the same position in the axial direction of the outer ring 11 and the inner ring 12.

The inner ring 12 has a body portion 12a for supporting the balls 13 in a rollable manner, and an extension portion 12b adjacent to the body portion 12a in the axial direction. On the outer diameter surface of the extension 12b,
Vibration sensor 17, temperature sensor 18, magnetic sensitive sensor 19
The stepped portion 12c is formed at the same axial position as, and the multipolar magnet 22 serving as the member to be detected is fixed to the stepped portion 12c.

The multipole magnet 22 is formed in an annular shape.
On the outer diameter surface of the multi-pole magnet 22, a plurality of S poles and N poles are alternately magnetized in the circumferential direction. The multi-pole magnet 22 constantly generates a magnetic force on the outer peripheral side, and by rotating integrally with the inner ring 12, the magnetic force generated by the multi-pole magnet 22 is given to the magnetic sensitive sensor 19 according to the rotation speed of the inner ring 12. The inner ring 12
The rotation speed of is detected.

The multi-pole magnet 22 is also arranged at the same axial position as the vibration sensor 17, the temperature sensor 18, and the magnetic sensitive sensor 19.

In this embodiment, a vibration sensor 17, a temperature sensor 18, and a magnetic sensor 19 fixed to the outer ring 11.
And the multi-pole magnet 22 fixed to the inner ring 12,
1. Since they are arranged at the same position in the axial direction in the space between the inner ring 12, detection of resonance and the like, detection of atmospheric temperature data, and detection of rotation speed of the inner ring 12 without increasing the width dimension of the bearing 10. It can be performed.

2A and 2B show a rolling bearing 30 with a sensor according to a second embodiment of the present invention. In the embodiments described below, members having the same configurations and operations as those already described will be denoted by the same reference numerals or corresponding reference numerals in the drawings to simplify or omit the description. FIG. 2B is a view on arrow b in FIG. In the present embodiment, the vibration sensor 17, the temperature sensor 18, and the magnetic sensitive sensor 19 are arranged at the same position in the axial direction of the outer ring 11 and deviated in the circumferential direction of the outer ring 11.
According to this embodiment, it is possible to deal with a case where the space between the inner and outer rings is narrow, and it is possible to reduce the diameter of the bearing. As the holding member 16, a member not having a U-shaped cross-section may be adopted, or a member having a U-shaped cross-section and having a narrow gap between the first plate portion 16a and the second plate portion 16b so that a sensor cannot be arranged between them. May be adopted.

FIG. 3 shows a rolling bearing 40 with a sensor according to a third embodiment of the present invention. Also in this embodiment, the outer ring 11 is a stationary wheel and the inner ring 12 is a rotating wheel. In the present embodiment, the step portion 11c in the extension portion 11b of the outer ring 11 is used.
The holding member 46 is fixed to the. The holding member 46 includes a first plate portion 46a fixed to the step portion 11c, and a second plate portion 46b arranged at a distance in the first plate portion in the radial direction.
The third plate portion 46d disposed between the first plate portion 46a and the second plate portion 46b is connected by the connecting portion 46c.

On the side of the second plate portion 46b of the third plate portion 46d,
The first magnetically sensitive sensor 49 is fixed. The second magnetic sensitive sensor 50 is fixed to the third plate portion 46d side of the second plate portion 46b.

The first magnetic sensitive sensor 49 and the second magnetic sensitive sensor 50 are arranged at intervals in the radial direction.
Between the first magnetic sensitive sensor 49 and the second magnetic sensitive sensor 50, a multi-pole magnet 42 serving as a member to be detected is arranged in the radial direction without contacting the first magnetic sensitive sensor 49 and the second magnetic sensitive sensor 50. It is arranged to face each other. The multi-pole magnet 42 is
It is fixed to the inner ring 12 by a magnet holding member 47.
The base end portion of the magnet holding member 47 is the extension portion 12b of the inner ring 12.
Is fixed to the step portion 12c. Magnet holding member 4
The tip of 7 locks the outer diameter surface of the multi-pole magnet 42.

As shown in FIG. 4, the multi-pole magnet 42 is formed in an annular shape. On the outer diameter surface of the multi-pole magnet 42, S
First magnetized portion 4 in which a plurality of poles and N poles are alternately magnetized in the circumferential direction.
2a is formed. On the inner diameter surface of the multi-pole magnet 42, only a single N pole is magnetized at a predetermined position.
b is formed. First magnetized portion 42a of the multi-pole magnet 42
Is generated toward the outer circumference, the magnetic force generated by the first magnetic sensitive sensor 4
The magnetic force given to the second magnetic sensitive sensor 50 is given to the second magnetic sensitive sensor 50. The first magnetic sensitive sensor 49 is used to detect the rotation speed of the inner ring 12, and the second magnetic sensitive sensor 50 is used.
Is used to detect the phase of the inner ring 12. first,
Hall elements or the like can be used as the second magnetic sensitive sensors 49 and 50.

Also in this embodiment, the first magnetic sensitive sensor 49 and the second magnetic sensitive sensor 50 fixed to the outer ring 11 are used.
Since the multi-pole magnet 42 fixed to the inner ring 12 is arranged at the same position in the axial direction, the rotational speed and the phase of the inner ring 12 can be detected without increasing the width dimension of the bearing. .

The present invention is not limited to the above-described embodiment, but can be appropriately modified and improved. For example, as a seal structure, a contact type seal member,
A labyrinth seal or the like may be used. For example, rollers or tapered rollers may be used as the rolling elements. For example, a plurality of sensors may be attached to the inner ring or the outer ring via a holding member so as to protrude from the space between the inner ring and the outer ring.

[0027]

As described above, according to the present invention,
A rolling bearing with a sensor can be provided in which a plurality of sensors are built in the bearing and the width dimension of the bearing can be shortened.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of a first embodiment.

FIG. 2A is an enlarged view of a main part of the second embodiment, and FIG. 2B is a view on arrow b in FIG.

FIG. 3 is an enlarged view of a main part of the third embodiment.

FIG. 4 is an external perspective view of a multi-pole magnet used in the third embodiment.

[Explanation of symbols]

10, 20, 40 Rolling bearing with sensor 11 inner ring 12 outer ring 13 balls (rolling elements) 17 Vibration sensor 18 Temperature sensor 19 Magnetic Sensitive Sensor (Sensor) 22,42 Multi-pole magnet (member to be detected)

Claims (7)

[Claims] 1. An inner ring, an outer ring, a rolling element interposed between the inner and outer rings, and a plurality of sensors provided on one axial side of the inner and outer rings, wherein the plurality of sensors are the same in the axial direction. A rolling bearing with a sensor, which is arranged in a position. 2. The member according to claim 1, further comprising a detected member which is arranged at an axial position equivalent to the plurality of sensors and which is sensed by at least one of the plurality of sensors radially opposed to the plurality of sensors. Rolling bearing with the described sensor. 3. The rolling bearing with a sensor according to claim 2, wherein the member to be detected is formed in an annular shape, and both the outer diameter surface and the inner diameter surface are sensed by any one of the plurality of sensors. 4. The rolling bearing with a sensor according to claim 3, wherein magnetized portions having different magnetized patterns are formed on an outer diameter surface and an inner diameter surface of the detected member. 5. The rolling bearing with a sensor according to claim 1, wherein the plurality of sensors are arranged so as to be displaced in the circumferential direction. 6. The rolling bearing with a sensor according to claim 1, wherein a seal structure is provided between the plurality of sensors and the rolling element when viewed in the axial direction of the inner and outer races. 7. A magnetic sensitive sensor, a temperature sensor, and a vibration sensor are included as the plurality of sensors.
A rolling bearing with a sensor according to any one of 1.