JP2002295465A - Rolling bearing with rotation sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a rolling bearing with a rotation sensor capable of precisely measuring rotational speed without causing rattling and positional slippage in either of the radial direction, the axial direction and in the circumferential direction on a sensor housing to be installed on a core bar mounted on a rolling bearing. SOLUTION: The core bar 7 and the sensor housing 8 are fixed by irregular fitting with an elastic adhesive, a protruded part 15 provided on the core bar 7 and a recessed part 16 provided on the sensor housing on the rolling bearing with the rotation sensor equipped with a detection element 9 on the sensor housing 8 installed on the core bar 7 mounted on an outer ring 3 on the fixed side by mounting a rotational element 6 on an inner ring 2 on the rotation side. Consequently, it is possible to realize the rolling bearing with the rotation sensor capable of preventing extraction from the core bar 7, positional slippage in the peripheral direction and measuring the number of rotations favourably in precision without rattling of the sensor housing 8 in the radial direction even when dimensions of the sensor housing 8 change as they receive influence of used environmental temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a rotation sensor housing for detecting a rotation speed and a rotation angle of an output shaft of an engine and a rotation shaft of a motor to a rolling bearing.

[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 has been
When it is attached to the rolling bearing 1 composed of the outer ring 3 and the rolling element 5, for example, as shown in FIG. The rotating element 6 is fitted. An annular sensor housing 18 made of a synthetic resin, which includes a peripheral wall 18a and a flange portion 18b extending inward thereof, is fitted to a cored bar 17 fitted to the inner diameter surface of the end of the outer race 3 on the fixed raceway side. Is press-fitted and fixed using hydraulic pressure. This annular sensor housing 18
The detection element 10 is attached to the electric circuit board 9 mounted on the substrate in the vicinity of the rotation element 6 so as to face the rotation element 6, and the rotation sensor is mounted on the bearing.

[0004]

However, assuming that the operating temperature range of the bearing with the rotation sensor changes in a range of, for example, -40 ° C to 120 ° C, if the operating environment temperature on the low temperature side is changed, press-fitting is performed. The outer diameter and width of the sensor housing 18, that is, the axial length of the peripheral wall 18 a contracts. Therefore, a gap in the radial direction is generated between the cored bar 17 and the sensor housing 18, and the sensor housing 18 is inclined with respect to the axial direction, rattles in the radial direction, or rotates in the circumferential direction, so that the rotating element If the position of the sensor and the detecting element are misaligned or severe, the sensor housing may fall out of the core bar, and the magnetic change due to the rotation of the rotating element cannot be detected with high accuracy. There is a problem that the waveform cannot be measured.

In order to avoid such a problem, even when the use environment temperature is low, the interference at the time of press fitting is increased so that a radial gap is not generated between the cored bar 17 and the sensor housing 18. When set, the sensor housing 18 is less likely to be pressed into the core 17. For this reason, there is a possibility that the sensor housing receives a large contact pressure due to the press-fitting and breaks.

On the other hand, when the operating environment temperature is high,
Contrary to the case of the low temperature side, since the outer diameter and width of the sensor housing 18, that is, the axial length of the peripheral wall 18a expands, the contact pressure due to the press-fit increases due to the radial expansion, and the overload stress increases. In the state, the sensor housing 18
Is more likely to crack. Further, the outer diameter surface of the sensor housing 18 is subjected to the action of the contact pressure in a high temperature range,
Because the core 17 is constrained, creep deformation occurs, and when the use environment temperature returns from a high temperature state to a normal temperature state, the sensor housing shrinks, and the creep deformation causes the elastic recovery of the radial interference by the creep deformation. Therefore, the gap in the radial direction between the sensor housing 18 and the core bar 17 increases, and the sensor housing 18
, Tilt in the radial direction, positional deviation in the circumferential direction, and the like are increased. Further, due to the creep deformation, the sensor housing 18 expands in the width direction, that is, the axial direction, and a force acts in this direction, and the sensor housing 18 easily comes off from the cored bar by a synergistic action with the thermal stress at the time of the contraction. Become.

In order to prevent the sensor housing from slipping out of the core bar, as shown in FIG.
If the sensor housing 18 is bent to the inner diameter side along the tapered portion formed on the outer surface thereof to suppress the axial movement of the sensor housing 18, it is possible to prevent the sensor housing 18 from coming off from the cored bar. However, even in this case, the above-described positional displacement in the circumferential direction cannot be prevented.

Accordingly, an object of the present invention is to provide a sensor housing mounted on a metal core fixed to the rolling bearing in an axial direction, a circumferential direction, and a radial direction even at a use environment temperature ranging from a low temperature range to a high temperature range. An object of the present invention is to realize a rolling bearing with a rotation sensor that can measure a rotation speed with high precision without rattling or displacement in any direction.

[0009]

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

That is, a rotating element is mounted on a rotating raceway side of a rolling bearing, an annular sensor housing is mounted on a core bar mounted on a fixed raceway side of the bearing, and a detection element is mounted on the sensor housing, and the rotating element is mounted on the rotating housing. In the rolling bearing with a rotation sensor provided so as to be close to and opposed to the core housing, a groove is provided on the outer periphery of the sensor housing, and the sensor housing is bonded to the core metal with an elastic adhesive filled in the groove, The gold and the sensor housing were fixed by fitting a convex part formed on the core metal and a concave part formed on the sensor housing.

With this configuration, when the use environment temperature is in a low temperature range, even if the sensor housing contracts in the radial direction, since the adhesive has elasticity, the fixed state of the core metal and the sensor housing is maintained. Can be maintained, and the sensor housing can be prevented from tilting without rattling in the radial direction. Then, even when a shearing force greater than the adhesive capacity of the adhesive is applied between the cored bar and the sensor housing in the axial direction or the circumferential direction due to vibration or the like, the convex portion of the cored bar remains in the sensor housing. Of the sensor housing, it is possible to prevent the sensor housing from moving in the axial direction and coming out of the housing, or rotating in the circumferential direction and being displaced.

When the operating environment temperature returns from a high temperature state to a normal temperature state, the sensor housing shrinks, and
The creep deformation eliminates the elastic recovery of the interference, so even when the radial gap between the sensor housing and the core becomes large, the elastic force of the adhesive causes
The fixed state can be maintained, and the backlash in the radial direction can be prevented. Furthermore, the axial displacement between the core metal and the sensor housing due to the axial expansion due to the creep deformation is suppressed by the fitting of the convex portion and the concave portion, so that the sensor housing comes off from the core metal. Can be prevented. As in the case described above, the concave and convex fitting can also prevent the sensor housing from being displaced in the circumferential direction.

It is desirable that the grooves provided in the sensor housing be formed continuously in the circumferential direction.

[0014] With this configuration, the core metal and the sensor housing are continuously bonded in the circumferential direction, so that the total bonding area is widened and the rattling in the radial direction can be reliably prevented. In addition, the ability to adhere to the shearing force acting in the axial direction or the circumferential direction between the cored bar and the sensor housing is improved.

It is preferable that the protrusion is a claw-shaped locking piece provided on the peripheral wall of the cored bar, the recess is a notch groove, and the locking piece is bent and fitted into the notch groove. .

According to this structure, the core metal and the sensor housing can be fixed by bending and fitting the claw-shaped locking piece into the notch groove, and the sensor housing can be pulled out and circumferentially. Misalignment can be prevented.

The convex portion protrudes toward the inner peripheral side so as to be curved along the axial direction of the metal core, and a plurality of the convex portions are formed in the circumferential direction of the metal core. A plurality can be formed in the circumferential direction at positions corresponding to the portions.

As described above, by forming both the convex portion and the concave portion in a shape curved in the axial direction,
It is possible to reliably prevent the sensor housing from slipping out as described above. In addition, since the plurality of protrusions are provided in the circumferential direction, the positional displacement of the sensor housing in the circumferential direction can be reliably prevented.

A plurality of the convex portions are formed in the circumferential direction of the core metal with the core metal having a V-shaped cross-sectional shape in the axial direction, and the concave portion of the sensor housing is formed in a circumferential direction at a position corresponding to the convex portion. A plurality can be formed.

As described above, even if the convex section and the concave section are each formed in a V-shape in the axial direction, the fitting of the concave and convex portions can prevent the sensor housing from coming out or being displaced in the circumferential direction. It can be reliably prevented.

A plurality of the convex portions are formed in the circumferential direction of the core metal so that the cross-sectional shape in the axial direction of the core metal is U-shaped, and the concave portion of the sensor housing is formed in a U-shape and located at a position corresponding to the convex portion. A plurality can be formed in the circumferential direction.

As described above, even if the projections and the recesses are each formed in the U-shape in the axial direction, as described above, the projections and the recesses of the sensor housing and the circumferential direction are formed by the fitting of these recesses and projections. Misalignment can be reliably prevented.

The above-mentioned curved convex portion, V-shaped convex portion and U-shaped convex portion are formed on a mandrel in advance.
The sensor housing in which a concave portion having a shape corresponding to each of these convex portions is formed may be mounted, and after the sensor housing is press-fitted into a metal core, the convex portion is formed by caulking the metal core. , May be fitted into the recess.

Further, when the convex portions are curved in the axial direction or have a V-shaped or U-shaped cross-sectional shape in the axial direction, when these convex portions are previously formed on the metal core, It becomes easy to press-fit the sensor housing into the cored bar.

[0025]

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.
The outer circumference of the end of the inner ring 2 of the rolling bearing 1 on the rotating raceway side of the rolling bearing 1 comprising the outer ring 3 and the rolling element 5 held by the retainer 4 is multi-polarized with a ferromagnetic thin film around the rotating drum. The rotating element 6 magnetized is fitted. A peripheral wall 8 is attached to the cored bar 7 fitted to the inner diameter surface of the end of the outer race 3 on the fixed raceway side.
An annular sensor housing 8 made of a synthetic resin and formed of a and a flange portion 8b is press-fitted and fixed using a hydraulic pressure with an interference. An electronic circuit board 9 is mounted in a groove 8c formed in a flange portion 8b of the sensor housing 8, and a detection element 10 is mounted on the inner peripheral surface of the peripheral wall 8a via the electric circuit board 9 by a radius of the sensor housing 8. The circuit board 9 is equipped with an electronic circuit component 11 so as to form a rotation sensor. The detection element 10 detects a magnetic change due to the rotation of the rotating element 6, outputs an output waveform, that is, a pulse signal, and measures the rotation speed of the rolling bearing 1.

As shown in FIG. 2, claw-shaped locking pieces 12 are formed at three places in the circumferential direction at the large-diameter end of the metal core 7, and correspond to the locking pieces 12. On the outer surface of the corner from the peripheral wall 8a to the flange 8b of the sensor housing 8, three notch grooves 13 into which the locking pieces 12 are fitted are also formed in the circumferential direction, and the locking pieces 12 are bent. The core metal 7 and the sensor housing 8 are fixed to each other and fitted into the notch grooves 13.

On the outer periphery of the peripheral wall 8a of the sensor housing 8, an adhesive filling groove 14 is formed continuously in the circumferential direction, and the filling groove 14 has elasticity mainly composed of silicone polymer and epoxy resin. The sensor housing 8 is adhered to the cored bar 7 by filling with the adhesive.

As described above, the locking pieces 12 formed on the cored bar 7
Is fitted into a notch groove 13 formed in the sensor housing 8, that is, a concave portion, and the core metal 7 and the sensor housing 8 are bonded to each other with the adhesive, so that the sensor housing press-fitted. 8 is fixed to the cored bar 7. In addition, the core metal 7 can be fitted to the outer peripheral surface of the end of the outer ring 3.

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

Since the sensor housing 8 is bonded to the metal core 7 with an adhesive having elasticity, when the operating environment temperature of the rolling bearing is in a low temperature range, the sensor housing 8 is moved in the radial direction. Even if it shrinks, the adhesive is elastically deformed and the bonded state between the core metal 7 and the sensor housing 8 is maintained, and the sensor housing 8 can be prevented from tilting without rattling in the radial direction. Even when a shearing force larger than the adhesive capacity of the adhesive acts on the core bar 7 and the sensor housing 8 in the axial or circumferential direction due to vibration or the like, the locking piece formed on the core bar 7. 12 is fitted in the notch groove 13 of the sensor housing 8,
It is possible to prevent the sensor housing 8 from moving in the axial direction and coming off, or from being displaced in the circumferential direction.

When the use environment temperature returns from a high temperature state to a normal temperature state, the sensor housing 8 contracts, and the creep deformation prevents the elasticity of the interference from recovering. Even when the radial gap becomes large, by the elastic force of the adhesive,
The fixed state is maintained, and the backlash in the radial direction can be prevented. Even in such a use state, the axial displacement between the metal core 7 and the sensor housing 8 due to the axial expansion due to the creep deformation is caused by the claw-shaped locking piece 12 and the notch groove 13. Since the sensor housing 8 is suppressed by the fitting, it is possible to prevent the sensor housing 8 from coming out of the cored bar 7 and to prevent the sensor housing 8 from being displaced in the circumferential direction.

Since the adhesive filling groove 14 is formed continuously in the circumferential direction on the outer periphery of the sensor housing 8, the total bonding area is increased, and the rattling in the radial direction can be reliably prevented. Further, the bonding ability against the shearing force acting in the axial direction or the circumferential direction between the cored bar 7 and the sensor housing 8 is improved.

The core metal 7 and the sensor housing 8 can be easily fixed only by bending and fitting the claw-shaped locking pieces 12 formed on the core metal into the cutout grooves 13 formed in the sensor housing 8. As a result, it is possible to prevent the sensor housing 8 from slipping out and being displaced in the circumferential direction as described above.

The claw-shaped locking piece 12 is shown in FIG.
As shown in FIGS. 1 (a) and 1 (b), the locking piece 12 may be formed such that the bending tip side is on the rolling bearing 1 side, contrary to the case shown in FIGS. 1 (b) and 2. it can.

FIGS. 4A, 4B, 5A,
(B) and FIGS. 6 (a) and (b) all show another embodiment.

As shown in FIGS. 4 (a) and 4 (b),
A plurality of the convex portions 15 curved in the axial direction are formed in the circumferential direction, and the convex portions 15 are fitted into the concave portions 16 curved in the axial direction formed on the sensor housing 8 so that the metal core 7 and the sensor housing 8 are formed. And can be fixed.

As shown in FIGS. 5 (a) and 5 (b),
A plurality of convex portions 15a having a V-shaped cross section in the axial direction are formed in the circumferential direction.
Similarly, the core 7 and the sensor housing 8 can be fixed by fitting into the concave portion 16a having the V-shaped cross section in the axial direction.

As shown in FIGS. 6 (a) and 6 (b),
A plurality of convex portions 15b having a U-shaped cross-section in the axial direction are formed in the circumferential direction.
Similarly, the core metal 7 and the sensor housing 8 can be fixed by fitting into the concave portion 15b having the U-shaped cross-section in the axial direction formed similarly.

As described above, in any case, the core metal 7 and the sensor housing 8 are fixed to each other by the concave and convex fitting of the convex portions and the concave portions, so that the sensor housing 8 can be reliably prevented from coming out of the core metal 7. can do. In addition, since each of the convex portions 15, 15a, and 15b is formed in a plurality in the circumferential direction, the positional displacement of the sensor housing 8 in the circumferential direction can be reliably prevented. In each case, the groove 14 formed on the outer peripheral surface of the sensor housing 8 is filled with an elastic adhesive and the core metal 7 and the sensor housing 8 are bonded to each other. Even if the sensor housing 8 contracts in the radial direction due to the influence of the use environment temperature, the rattling in the radial direction and the inclination of the sensor housing can be prevented.

Each of the above-mentioned projections 15, 15a, and 15b is formed on the core metal 7 in advance, and then the recesses 16, 16a, and 16b each having a shape corresponding to each of these projections are formed on the outer peripheral surface. The housing 8 may be press-fitted.
After the sensor housing 8 is press-fitted into the core bar 7, the core bar 7 may be crimped to form each of the convex portions and fit into each of the concave portions.

The adhesive filling groove 14 formed continuously in the circumferential direction on the outer peripheral surface of the sensor housing.
As shown in FIG. 7, the groove 14a has a cross-sectional shape curved and depressed in the axial direction of the sensor housing. As shown in FIGS. 8 (a) and 8 (b), the cross-sectional shape in the axial direction is V-shaped. The groove 14b may be any one of a groove 14b and a rectangular groove 14c, and a plurality of the grooves 14a, 14b and 14c may be provided on the outer peripheral surface of the sensor housing 8, for example, as shown in FIGS. 9 and 10 (a). As shown in (b), two may be formed. Also, these filling grooves 14a, 14b, 14c
And any of the above-mentioned convex portions formed on the core bar 7 and the above-mentioned concave portions formed on the sensor housing 8 corresponding to the shapes of these convex portions, as described above,
The core 7 and the sensor housing 8 are adhered to each other, and each of the projections is fitted into each of the recesses.
Can be prevented from rattling in the radial direction, tilting in the axial direction, displacement in the circumferential direction, and slipping out of the cored bar 7.

[0043]

As described above, according to the present invention, the cored bar attached to the fixed race and the sensor housing to which the detecting element of the rotation sensor is attached are bonded by using an elastic adhesive. And, since it was fixed by the concave and convex fitting of the convex part formed in the cored bar and the concave part formed in the sensor housing,
When the use environment temperature is low, or when the temperature returns to the normal temperature from the high temperature state, even if the sensor housing contracts in the radial direction, the adhesive state with the core metal is maintained by the elastic deformation of the adhesive. In addition, the sensor housing can be prevented from tilting without rattling in the radial direction.

Further, even when a shearing force greater than the adhesive capacity of the adhesive acts between the cored bar and the sensor housing due to vibration or the like, the sensor housing comes out of the cored bar due to the concave and convex fitting. Or a positional shift due to rotation in the circumferential direction can be prevented.

Thus, it is possible to realize a rolling bearing with a rotation sensor capable of measuring an accurate output waveform from the detection element accompanying the rotation of the rotation element without being affected by the use environment temperature.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a main part of fixing a cored bar mounted on the rolling bearing with a rotation sensor of FIG. 1 and a sensor housing.

3 (a) is a perspective view showing a main part of another embodiment of fixing a cored bar attached to the rolling bearing with a rotation sensor and the sensor housing of FIG. 1 to another embodiment. (B) Longitudinal section of a rolling bearing with a rotation sensor same as the above Side view

4 (a) is a perspective view showing an essential part of another embodiment of fixing a cored bar mounted on the rolling bearing with a rotation sensor of FIG. 1 and a sensor housing. (B) Longitudinal section of the same rolling bearing with a rotation sensor. Side view

5 (a) is a perspective view showing a main part of another embodiment of fixing a cored bar attached to the rolling bearing with a rotation sensor of FIG. 1 to a sensor housing. (B) Longitudinal section of the rolling bearing with a rotation sensor same as the above. Side view

6 (a) is a perspective view showing an essential part of another embodiment of fixing a cored bar mounted on the rolling bearing with a rotation sensor and the sensor housing of FIG. 1 to another embodiment. (B) Longitudinal section of the same rolling bearing with a rotation sensor. Side view

FIG. 7 is a partially omitted longitudinal side view of a rolling bearing with a rotation sensor having a groove for filling an adhesive in a sensor housing according to an embodiment of the present invention.

8A is a longitudinal sectional side view of a partially omitted rolling bearing with a rotation sensor in which a filling groove having a shape different from that of FIG. 7 is formed. FIG. 8B is a shape different from FIG. Partly omitted longitudinal side view of a rolling bearing with a rotation sensor having a groove for filling

FIG. 9 is a partially omitted longitudinal side view of the rolling bearing with a rotation sensor having two filling grooves shown in FIG. 7;

10A is a partially omitted longitudinal side view of a rolling bearing with a rotation sensor in which two filling grooves shown in FIG. 8A are formed. FIG. 10B shows the filling groove shown in FIG. Partially omitted longitudinal side view of a rolling bearing with a rotation sensor formed in two pieces

FIG. 11 is a longitudinal sectional side view of a conventional rolling bearing with a rotation sensor.

FIG. 12 is a longitudinal sectional side view of another conventional rolling bearing with a rotation sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner ring 3 Outer ring 4 Cage 5 Rolling element 6 Rotating element 7 Core 8 Sensor housing 8a Peripheral wall 8b Collar 8c Groove 9 Electric circuit board 10 Detecting element 11 Electronic circuit parts 12 Locking piece 13 Notch groove 14, 14a, 14b, 14c Filling groove 15, 15a, 15b Convex part 16, 16a, 16b Concave part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F063 AA35 BA03 BA30 BC02 CB02 CC08 DA01 DA05 DB01 DB07 DD02 GA52 GA61 GA68 ZA01 3J101 AA02 AA32 AA42 AA52 AA62 FA23 GA21 GA24

Claims (6)

[Claims] 1. A rolling element is mounted on a rotating raceway side of a rolling bearing, an annular sensor housing is mounted on a core bar mounted on a fixed raceway side of the bearing, and a detecting element is mounted on the sensor housing, and the rotating element is mounted on the rolling element. In the rolling bearing with a rotation sensor mounted so as to be close to and facing the sensor housing, a groove is provided on the outer periphery of the sensor housing, and the sensor housing is bonded to the core metal with an elastic adhesive filled in the groove, A rolling bearing with a rotation sensor, wherein gold and a sensor housing are fixed by fitting a convex portion formed on a cored bar and a concave portion formed on the sensor housing. 2. The rolling bearing with a rotation sensor according to claim 1, wherein the groove provided in the sensor housing is formed continuously in a circumferential direction. 3. The projection is a claw-shaped locking piece provided on a peripheral wall of the cored bar, the recess is a notch groove, and the locking piece is bent and fitted into the notch groove. The rolling bearing with a rotation sensor according to claim 1 or 2, wherein: 4. The projecting portion projects to the inner peripheral side so as to be curved along the axial direction of the cored bar, and a plurality of the projecting portions are formed in the circumferential direction of the cored bar.
3. The rolling bearing with a rotation sensor according to claim 1, wherein a plurality of the bearings are formed in a circumferential direction at positions corresponding to the protrusions. 4. 5. A plurality of protrusions are formed in the circumferential direction of the core metal with the core metal having a V-shaped cross-sectional shape in the axial direction, and the concave portion of the sensor housing is formed at a position corresponding to the protrusion. A plurality is formed in the direction.
Or the rolling bearing with a rotation sensor according to 2. 6. A plurality of the convex portions are formed in the circumferential direction of the core metal with the core metal having a U-shaped cross-sectional shape in the axial direction, and the concave portion of the sensor housing has a U shape and corresponds to the convex portion. The rolling bearing with a rotation sensor according to claim 1, wherein a plurality of the rolling bearings are formed in a circumferential direction at the set positions.