JP2002296289A - Roller bearing with rotary sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten an axis-directional length of a housing required for equipment to realize a compact roller bearing with a rotary sensor, when the rotary sensor is equipped to the roller bearing. SOLUTION: In this roller bearing with the rotary sensor equipped with a rotary element 13 engaged with an inner ring 2 of the roller bearing 1, and a detection element 9 opposed to the rotary element 13 in the vicinity of the rotary element 13 in an electric circuit board 8 equipped to an annular sensor housing 6 fixed to a core metal 5 engaged with an outer ring 3, the circuit board 8 is formed by a plastic film to exhibit flexibility. The circuit board 8 is thereby bent curvedly without generating a cruck to be equipped in a limited space such as a circumferential wall 6a of the sensor housing 6, and the roller bearing with the rotary sensor is manufactured compactly since the axis- directional length thereof is shortened.

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 rotation sensor having a detection element for detecting a rotation speed and a rotation angle of an output shaft of an engine or a rotation shaft of a motor mounted on a flexible electric circuit board. About bearings.

[0002]

2. Description of the Related Art As a method of detecting the number of revolutions and the angle of rotation of the output shaft and the rotating shaft, a change in magnetism caused by rotation of a rotating element which is multipolarly magnetized by a ferromagnetic thin film around a rotating drum is described.
2. Description of the Related Art There is known a method using a rotation sensor that detects a signal by a detection element and outputs the pulse signal.

Conventionally, such a rotation sensor is, for example,
As shown in FIGS. 5A and 5B, the inner ring 2 and the outer ring 3
And when it is attached to a rolling bearing composed of the rolling elements 4,
A multi-pole magnetized rotating element 13 is fitted to the end outer diameter surface of the inner ring 2 on the rotating raceway side. Then, as shown in FIG. 6 (a), the core metal 5 fitted on the inner diameter surface of the end of the outer race 3 on the fixed raceway side is formed from a peripheral wall 16a and a flange 16b extending inward thereof. Annular sensor housing 16
Is fixed. A groove 17 having a sectional shape as shown in FIG. 6B is formed in the annular sensor housing 16. The groove 17 is made of an epoxy resin containing glass fiber and having a thickness of about 1 mm, which is excellent in insulation performance and strength. The electric circuit board 18 is fitted and mounted on the collar 16b. The detection element 9 is provided on the electric circuit board 18 with the groove 17.
The electronic circuit component 10 is mounted on the surface of the substrate 18 so as to fit on the inner peripheral surface of the peripheral wall 16a having the above-mentioned structure.

In this manner, a rotation sensor including the rotating element 13 magnetized in multiple poles and the detecting element 9 for detecting a magnetic change caused by its rotation is mounted on the rolling bearing.

[0005]

However, as shown in FIGS. 5A and 5B, when the electric circuit board 18 is mounted on the flange 16b of the sensor housing 16, the axial direction of the peripheral wall 16a is not sufficient. Needs to be large enough to accommodate the rotating element 13 and the sensor housing 16
However, since it is necessary to cover at least the bulkiness of the electronic circuit component 10 mounted on the electric circuit board 18, there is a disadvantage that the length L4 in the axial direction becomes long.

In order to solve such a disadvantage, a method of attaching the electric circuit board 18 to the inner peripheral surface of the peripheral wall 16a of the sensor housing 16 is considered. However, the electric circuit board 18 made of glass fiber-containing epoxy resin has high mechanical strength, but has no elasticity and is hard and easily broken, so that it is impossible to mount the electric circuit board 18 on the inner peripheral surface of the peripheral wall 16a by bending it. .

In order to mount the epoxy resin electric circuit board 18 on the inner peripheral surface of the peripheral wall 16a of the sensor housing 16 without breaking, as shown in FIGS. The substrate 18 is divided and divided substrate 1
8a. However, in order to mount the divided substrate 18a on the inner peripheral surface of the peripheral wall 16a of the sensor housing 16, a groove 17a for mounting the divided substrate 18a is formed on the inner peripheral surface, and the divided substrate 18a is inserted into the groove 17a. Each has to be fixed, which requires time and effort, and increases the production cost.

It is an object of the present invention to provide a compact bearing with a rotation sensor by reducing the axial length of the housing required for mounting the rotation sensor on the rolling bearing.

[0009]

In order to solve the above-mentioned problems, the present invention employs the following configuration.

[0010] That is, a rotating element mounted on a rotating raceway side of a rolling bearing and a detecting element mounted on a fixed raceway side of the bearing via an electric circuit board are opposed to each other to form a rotation sensor having a rotation sensor. In rolling bearings with sensors,
The electric circuit board was formed to have flexibility.

In this way, the electric circuit board is easily mounted in a limited narrow space near the rolling bearing without being broken and without being divided as described above. be able to. Thus, the rolling bearing equipped with the rotation sensor can be designed compact.

Further, since the degree of curvature of the electric circuit board can be easily changed, electric circuit boards of the same standard can be used between rolling bearings of different model numbers.

It is preferable that the electric circuit board is formed from a plastic film.

[0014] In this manner, the flexible circuit board has good insulation performance required for the electric circuit board. Further, the thickness of the substrate can be reduced as compared with a conventional epoxy resin substrate containing glass fibers.

It is preferable that the electric circuit board is curved and attached to an inner peripheral surface of an annular sensor housing fixed to an end portion of a fixed race of the bearing.

As described above, since the electric circuit board is flexible, it can be easily curved and attached along the peripheral wall, and as shown in FIGS. 5 (a) and 5 (b), In the flange 16b of the sensor housing 16,
Since the electric circuit board 18 does not need to be attached, the axial length L4 of the sensor housing 16 can be reduced, and the rolling bearing can be designed compact.

It is preferable that the sensor housing comprises a peripheral wall and a flange portion extending inward, and the electric circuit board is mounted on the collar portion such that the substrate surface is orthogonal to the axial direction of the bearing.

Since the electric circuit board is formed in the shape of a film as described above, its thickness is smaller than that of the conventional electric circuit board 18 made of epoxy resin.
As shown in (b), even when the electronic circuit component 10 is mounted on the flange 16b of the sensor housing 16 and the electronic circuit component 10 is mounted, the amount of protrusion from the mounting surface is smaller than in the related art.
The axial length L4 of the sensor housing can be reduced, and the rolling bearing can be designed to be compact.

The detecting element and the rotating element can be opposed to each other in the radial direction of the bearing.

With this configuration, the detection element can be easily mounted on the electric circuit board regardless of whether the electric circuit board is mounted on the peripheral wall or the flange of the sensor housing.

[0021] The detecting element and the rotating element can be opposed to each other in the axial direction of the bearing.

In this case, the detecting element can be easily mounted on the electric circuit board mounted on the peripheral wall or the collar of the sensor housing.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The rolling bearing with a rotation sensor according to the embodiment of the present invention has an inner race 2 as shown in FIGS.
A rotating element having a multi-pole magnetized by a ferromagnetic thin film or the like around a rotating drum on an outer peripheral surface of an end portion of an inner ring 2 on a rotating raceway side of a rolling bearing 1 comprising an outer ring 3 and a rolling element 4. 13 is fitted. An annular sensor housing 6 composed of a peripheral wall 6a and a brim 6b, whose cross-sectional shape is shown in FIG. 2A, is fitted to a cored bar 5 fitted to the inner diameter surface of the end of the outer race 3 on the fixed raceway side. Are mounted concentrically. The flange 6b of the sensor housing 6 is provided with an arc-shaped groove 7 having two concave portions 7a as shown in FIG. 2 (b). A film-like flexible film of polyethylene terephthalate with excellent electrical insulation and a thickness of about 200 μm,
The electric circuit board 8 that provides the required insulation performance is mounted in a curved manner. In addition, as the electric circuit board 8, other thermoplastic plastic films having excellent electric insulation such as polyethylene, polyimide and vinyl chloride can be used. These plastic films can be formed by a conventional film forming method by roll processing or extrusion processing.

At one end of the electric circuit board 8, the detecting element 9 is fitted and fitted in the concave portion 7 a of the groove 7 so as to face the rotating element 13 in the radial direction. The central part is provided with an electronic component 10 for removing power supply noise and the like, and thus a rotation sensor is formed. Then, a magnetic change due to the rotation of the rotating element 13 is detected by the detecting element 9, a pulse signal is output from the detecting element 9, and the rotational speed of the rolling bearing 1 is measured. A power cable 12 is connected to the other end of the electric circuit board 8.

The embodiment of the present invention is configured as described above, and its operation will be described below.

Since the electric circuit board 8 is formed in a film shape, the electric circuit board 8 can be formed thinner than a conventional glass fiber-containing epoxy resin board. Since the electric circuit board 8 has flexibility, the electric circuit board 8 is not broken, and the divided circuit board 18a shown in FIGS. 7A and 7B is used.
As described above, even if the electric circuit board 8 is not divided, the electric circuit board 8 can be easily mounted on the inner peripheral surface of the peripheral wall 6a of the annular sensor housing 6 by being curved. As a result, the axial length L1 of the sensor housing 6 is shorter than the axial length L4 shown in FIG. 1 can be designed compact.

Also, the rolling bearing 1 has a different model number,
Even when the curvature of the inner peripheral surface of the peripheral wall 6a of the sensor housing 6 is different, the electric circuit board 8 can be mounted by changing the degree of curvature, and the same standard electric circuit board 8 can be used between bearings of different model numbers. Can and is economical.

In another embodiment shown in FIG. 3, the electric circuit board 8 is mounted on the inner peripheral surface of the peripheral wall 6a of the annular sensor housing 6, and the detecting element 9 is mounted on the electric circuit board as in the case shown in FIG. 8 is provided so as to face the rotating element 13 fitted to the inner ring 2 in the vicinity of the axial direction.
3, this opposing surface is magnetized in multiple poles by a ferromagnetic thin film,
A rotation sensor is formed. In this case, FIG.
As in the case shown in (1), the axial length L2 of the sensor housing 6 is shorter than the length L4 of the prior art (see FIG. 5).

In another embodiment shown in FIG. 4, FIG.
(A) Similar to the mounting state of the electric circuit board 18 shown in (b), the brim of the sensor housing 6 fixed to the cored bar 5 fitted to the inner diameter surface of the end of the outer race 3 on the fixed raceway side. The film-shaped electric circuit board 8 is mounted on the portion 6b,
A detection element 9 is mounted on the electric circuit board 8 so as to fit on the inner peripheral surface of the peripheral wall 6a in which the groove 7 is formed.
The electronic circuit component 10 is mounted on the surface of the electronic component. As described above, even when the electric circuit board 8 is mounted on the flange portion 6b of the sensor housing 6 as in the conventional case, the thickness of the film-shaped electric circuit board 8 is larger than the thickness of the epoxy resin electric circuit board. Since the sensor housing 6 is also thin, the axial length L3 of the sensor housing 6 can be shorter than the conventional length L4. In this case as well, the detecting element 9 can be provided on the electric circuit board 8 so as to face the rotating element 13 in the axial direction as shown in FIG.

In the embodiment shown in FIGS. 1 to 3, the core 5 for fixing the sensor housing 6 is provided with the rolling bearing 1.
The outer ring 3 is fitted on the inner diameter surface at the end, but may be fitted on the outer diameter surface at the end of the outer ring 3.

In the case where the rotating race is an outer race, the rotating element is fitted to an inner diameter surface or an outer diameter surface of an end of the outer race,
The cored bar is fitted to the outer diameter surface of the end of the inner race of the fixed race, and the sensor housing is fixed to the cored bar. The detecting element may be mounted on the mounted film-like electric circuit board so as to be in close proximity to the rotating element to form a rolling bearing with a rotation sensor.

[0033]

As described above, according to the present invention, the electric circuit board provided with the detecting element of the rotation sensor and the electronic circuit parts is formed in a film shape to have flexibility. The substrate can be mounted in a limited space such as the inner peripheral surface of the peripheral wall of the annular sensor housing, and the axial length of the sensor housing can be reduced as compared with the related art. Further, since the electric circuit board can be mounted on the sensor housing with varying degrees of curvature, electric circuit boards of the same standard can be used between bearings of different model numbers.

Thus, the rolling bearing with the rotation sensor can be manufactured compactly and without waste.
A rotation sensor can be easily installed on rolling bearings of a type with a small raceway width.

[Brief description of the drawings]

FIG. 1A is a partially omitted front view of a rolling bearing with a rotation sensor according to an embodiment of the present invention. FIG.

2A is an enlarged vertical sectional side view of the sensor housing taken along line aa shown in FIG. 1. FIG. 2B is an enlarged vertical sectional side view of the sensor housing taken along line bb in FIG.

FIG. 3 is an enlarged longitudinal sectional side view of a partially omitted rolling bearing with a rotation sensor according to another embodiment.

FIG. 4A is a partially omitted front view of a rolling bearing with a rotation sensor according to another embodiment. FIG. 4B is an enlarged vertical sectional side view taken along line AA in FIG.

FIG. 5 (a) is a partially omitted front view of a rolling bearing with a rotation sensor according to the prior art; and (b) is an enlarged vertical sectional side view taken along line aa of FIG.

6A is an enlarged longitudinal sectional side view of the sensor housing taken along line aa shown in FIG. 5; FIG. 6B is an enlarged longitudinal sectional side view of the sensor housing taken along line bb in FIG.

FIG. 7A is a partially omitted front view of another conventional rolling bearing with a rotation sensor. FIG. 7B is an enlarged vertical sectional side view taken along line AA in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner ring 3 Outer ring 4 Rolling element 5 Core 6 Sensor housing 6a Peripheral wall 6b Collar 7 Groove 7a Depression 8 Electric circuit board 9 Detecting element 10 Electronic circuit component 12 Power cable 13 Rotating element

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[Procedure amendment]

[Submission Date] February 28, 2002 (2002.2.2)
8)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 7

[Correction method] Change

[Correction contents]

FIG. 7

Claims (6)

[Claims] A rotation element having a rotation sensor formed by opposing a rotation element mounted on a rotating raceway side of a rolling bearing and a detection element mounted on a fixed raceway side of the bearing via an electric circuit board. A rolling bearing with a rotation sensor, wherein the electric circuit board is a flexible board. 2. The rolling bearing with a rotation sensor according to claim 1, wherein the electric circuit board is formed from a plastic film. 3. The electric circuit board according to claim 1, wherein the electric circuit board is curved and attached to an inner peripheral surface of an annular sensor housing fixed to an end of a fixed race of the bearing. A rolling bearing with a rotation sensor according to item 1. 4. An annular sensor housing comprising a peripheral wall and a flange portion extending inward therefrom, wherein the electric circuit board is mounted on the collar portion so that a substrate surface thereof is orthogonal to an axial direction of the bearing. 3. The method according to claim 1, wherein
A rolling bearing with a rotation sensor according to item 1. 5. The rolling bearing with a rotation sensor according to claim 1, wherein the detecting element and the rotating element are opposed to each other in a radial direction of the bearing. 6. The rolling bearing with a rotation sensor according to claim 1, wherein the detection element and the rotating element are opposed to each other in the axial direction of the bearing.