JP4250890B2 - Rolling bearing with sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sensor-equipped rolling bearing provided with a sensor for detecting the rotational speed and the like.
[0002]
[Prior art]
Conventionally, as a rolling bearing with a sensor, for example, there are those disclosed in Japanese Patent Application Laid-Open Nos. 7-311212 and 10-31740.
In any of these configurations, a sensor is attached to an outer ring that is a stationary ring via a holding member, and a detection member such as a multipolar magnet is attached to an inner ring that is a rotating ring.
[0003]
FIG. 6 shows a rolling bearing 90 with a sensor disclosed in Japanese Patent Laid-Open No. 7-311212. The rolling bearing 90 holds a ball 93 between the outer ring 91 and the inner ring 92 such that the ball 93 can roll. A seal member 94 is provided on one side in the axial direction. A sensor 96 is provided on the outer ring 91 via a holding member 95, and a detected member 99 is provided on the inner ring 92 via a holding member 98 on the end surface opposite to the side where the seal member 94 is provided.
[0004]
The holding member 95 attached to the outer ring 91 is connected to the attachment portion 95a fitted to the inner diameter surface of the outer ring 91, the flange portion 95b connected to the attachment portion 95a and extending radially outward, and the flange portion 95. And a sensor holding portion 95c extending in the axial direction. The flange portion 95 b covers the entire end surface of the outer ring 91. A sensor 96 is held on the inner diameter surface of the sensor holding portion 95c.
The holding member 98 attached to the inner ring 92 is formed in an L-shaped cross section having a cylindrical portion that fits on the outer diameter surface of the inner ring 92 and a detected member holding portion that is raised radially outward from the cylindrical portion. The detected member 99 is held so as to be opposed to the sensor 96 in the axial direction with a minute gap.
[0005]
Such a sensor-equipped rolling bearing 90 is normally used by being press-fitted into a predetermined housing (not shown).
[0006]
[Problems to be solved by the invention]
In the rolling bearing with sensor 90 as shown in FIG. 6, when a load is applied as shown by an arrow P in FIG. 6 to press fit into the housing, and the outer ring 91 is pushed in the axial direction via the sensor 96, There is a possibility that the distance between the sensor 96 and the member to be detected 99 is shifted and accurate detection of the rotational speed or the like cannot be performed. In addition, a load P may be applied to set a preload on the rolling bearing 90, and the distance between the sensor 96 and the member 99 to be detected may be shifted. Since the holding member 95 and the sensor 96 are usually formed of resin in order to fix the sensor 96, they are easily damaged or deformed by the load P.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sensor-equipped rolling bearing capable of maintaining accurate detection accuracy even when a load that presses the end face of the raceway ring is applied.
[0007]
[Means for Solving the Problems]
The object of the present invention is achieved by the following configurations.
(1) An inner ring as a rotating wheel, an outer ring as a stationary wheel, a rolling element composed of balls interposed between the inner and outer rings , a sensor provided on one axial side of the outer ring , and sensing by the sensor A sensor-equipped rolling bearing that has a larger axial clearance than a radial clearance, and is used by being press-fitted into a housing .
The sensor is held in the outer ring via the first holding member, the detection member is held in the inner ring via the second holding member, an outer ring end surface on which the first holding member is provided, the first It can be pressed in the axial direction by a flange portion that is provided on the holding member and extends in the radial direction while contacting the end face of the outer ring,
The first holding member attached to the outer ring has a bent part that is bent so as to rise in the radial direction at the tip of a cylindrical attaching part fitted to the inner diameter surface of the outer ring,
The detected member is constituted by an annular magnet, and adjoins a first portion having a plurality of magnetic poles alternately in the circumferential direction and a second portion whose magnetization pattern is different from the first portion in the axial direction,
The sensor have a two sensors opposite the first portion and the respective radially second part of the detection member,
The sensor held by a sensor holding ring attached to the first holding member is disposed on the inner diameter side of the detected member held by the second holding member, and the inner ring includes the sensor and the sensor A rolling bearing with a sensor, comprising an end face located on an inner peripheral side of the sensor holding ring .
(2) the tip of the bent portion, the plane of the rolling element side extending in a radial direction of the second holding member to which the attached to the inner ring to be rotating ring wall and protrudes inverted body side ( Rolling bearing with sensor as described in 1 ).
( 3 ) Rolling with a sensor according to (1) or (2), wherein the sensor and the member to be detected are held by the first holding member and the second holding member so as to face each other in the radial direction. Bearings .
[0008]
According to the rolling bearing with a sensor having the above-described configuration, at least one of the inner ring end face and the outer ring end face can be pressed in the axial direction without using a sensor or a member to be detected. For example, at least a part of the inner ring end face and the outer ring end face is exposed and can be directly pressed in the axial direction. Therefore, the position of the sensor and the member to be detected is not shifted at the time of assembling or setting the preload, and the detection accuracy does not deteriorate.
Further, the inner ring end face and the outer ring end face can be pressed in the axial direction via a flange portion that is provided on the first holding member or the second holding member and extends in the radial direction while contacting the inner ring end face or the outer ring end face. In this case as well, the flange portion is supported by the inner ring end surface or the outer ring end surface, so that it is not damaged or deformed. Therefore, similarly to the above, the position of the sensor and the member to be detected is not shifted at the time of assembly or preload setting, and the detection accuracy does not deteriorate. Moreover, since the axial direction positioning of the 1st or 2nd holding member in which the flange part was provided can be performed with a flange part, the 1st or 2nd holding member in which the flange part was provided to the bearing Installation can be done accurately and easily.
[0009]
In the above configuration, the first or second holding member provided with the flange portion is attached to the stationary wheel so that the flange portion abuts on the end surface of the stationary wheel, and the sensor is held by the holding member. Can be operated accurately.
In addition, if a bent part is formed at the tip of the mounting part fitted to the inner or outer diameter surface of the stationary ring of the holding member attached to the stationary ring, the lubricant leaks out of the bearing space. Can be remarkably prevented. In particular, the leakage of the lubricant can be prevented more remarkably if the tip of the bent portion protrudes toward the reversing moving body from the surface on the rolling element side of the wall extending in the radial direction of the other holding member.
Further, if the first and second holding members are held so that the sensor and the member to be detected are opposed to each other in the radial direction, the detection accuracy is surely lowered with the positional deviation of the sensor and the member to be detected. Can be prevented. Among them, the labyrinth part can be configured by arranging one held by the first holding member fixed to the outer ring on the other inner peripheral side held by the second holding member, and intrusion of foreign matters such as dust Can be remarkably prevented.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described 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 sensor-equipped rolling bearing 10, a plurality of balls (rolling elements) 13 are interposed between the outer ring 11 and the inner ring 12. The plurality of balls 13 are held by a cage 13a so as to roll freely at intervals in the circumferential direction.
Here, the outer ring 11 is a stationary wheel and the inner ring 12 is a rotating wheel.
[0011]
A shield 14 as a seal member is provided on one side (left side in the figure) of the rolling bearing 10 in the axial direction. The shield 14 has a proximal end portion (outer peripheral portion) fixed to the outer ring 11. The tip part (inner peripheral part) of the shield 14 is not in contact with the inner ring 12, and the shield 14 is a non-contact type sealing member.
It is also possible to use a contact-type seal member as shown in FIG.
[0012]
A first holding member 15 is fixed to the outer ring 11 and a second holding member 18 is fixed to the inner ring 12 on the other axial side of the rolling bearing 10 (right side in the drawing). The first holding member 15 and the second holding member 18 can be made of metal, and these can be formed by sheet metal processing or the like.
[0013]
The first holding member 15 has a cylindrical mounting portion 15a fitted to the inner diameter surface of the outer ring 11, a flange portion 15b connected to the mounting portion 15a and extending radially outward, and the same as the mounting portion 15a. An extension 15c is connected to the flange 15b at the radial position and extends in the axial direction, and a sensor holding part 15d is connected to the axial end of the extension 15c and extends inward in the radial direction. . Furthermore, a bent portion 15e raised inward in the radial direction is provided on the side of the mounting portion 15a opposite to the side to which the flange portion 15b is connected (left side in the figure).
The second holding member 18 extends in the radial direction, and a base end portion (inner peripheral portion) thereof is caulked and fixed to a groove formed in the outer diameter surface of the inner ring 12, and a distal end portion ( And a detected member holding portion 18b that is connected to the outer peripheral portion and extends in the axial direction.
[0014]
An annular multipolar magnet 19 as a detected member is held on the inner peripheral surface of the detected member holding portion 18 b of the second holding member 18.
The tip of the sensor holding part 15d of the first holding member 15 extends from the multipolar magnet 19 to the inner peripheral side, and a separate sensor holding ring 17 is attached thereto. A magnetic sensitive sensor 16 as a sensor is held on the outer peripheral surface of the sensor holding ring 17. The magnetic sensitive sensor 16 is arranged on the inner peripheral side of the multipolar magnet 19 with a small gap therebetween, and both face each other in the radial direction. The first holding member 15 is not in contact with the second holding member 18 and the multipolar magnet 19, and the second holding member 18 is not in contact with the first holding member 15 and the magnetic sensor 16.
[0015]
Here, the multipolar magnet 16 having a first portion 19a having a different magnetization pattern and a second portion 19b adjacent to the first portion 19a in the axial direction is used. The first portion 19a has a configuration in which a plurality of S poles and N poles are alternately arranged in the circumferential direction (for example, a total of 64 poles). The second portion 19b has a configuration in which the S pole and the N pole are arranged at only one place in the circumferential direction.
The magnetic sensitive sensor 16 also has a first portion 16a and a second portion 16b, and faces the first portion 19a and the second portion 19b of the multipolar magnet 19 in the radial direction, respectively. The rotational speed of the inner ring 12 can be observed at the first portion 16a of the magnetic sensor 16, and the rotational phase of the inner ring 12 can be observed at the second portion 16b.
[0016]
FIG. 2 is an enlarged view of a main part of FIG. As shown in FIG. 2, the flange portion 15 b of the first holding member 15 is formed so as to be bent in a U shape without a gap and extend in the radial direction, and one side surface thereof is in contact with the end surface of the outer ring 11. Yes. Even if a pressing load is applied to the other side surface of the flange portion 15b as shown by an arrow P1 in the figure, the flange portion 15b is supported by the outer ring end surface, so that it does not deform at all and the pressing load P1 is transmitted to the outer ring 11 as it is. . As described above, the extension portion 15c of the first holding member 15 extends in the axial direction at the same radial position as the mounting portion 15a. Therefore, when the pressing load P1 is applied to the outer ring end surface via the flange portion 15b, The extension 15c does not get in the way.
In the present embodiment, almost the entire end face of the inner ring 12 is positioned on the inner peripheral side from the magnetic sensor 16 and the sensor holding ring 17. That is, almost the entire end face of the inner ring 12 is exposed, and the magnetic sensor 16 or the sensor holding ring 17 does not get in the way when a pressing load is applied as shown by the arrow P2 in the figure.
[0017]
Further, as shown in FIG. 2, the tip of the bent portion 15 e provided in the mounting portion 15 a of the first holding member 15 is a ball of the connecting portion 18 a that is a wall extending in the radial direction of the second holding member 18. It protrudes from the side surface on the 13th side to the antiball side (projection amount A). Due to the centrifugal force associated with the rotation of the inner ring 12 and the second holding member 18, the lubricant such as grease on the inner ring 12 side flows along the side surface on the ball 13 side of the connecting portion 18a to the outer ring 11 side. The lubricant hits the bent portion 15e and is guided to the ball 13 side. That is, the lubricant is blocked by the bent portion 15e and does not leak out from the bearing space.
[0018]
According to the sensor-equipped rolling bearing 10 having the above-described configuration, the inner ring end face can be directly pressed in the axial direction, and the outer ring end face can be pressed in the axial direction only through the flange portion 15 b of the first holding member 15. Further, the multipolar magnet 19 and the magnetic sensor 16 are held so as to face each other in the radial direction. Therefore, the position of the multipolar magnet 19 and the magnetic sensitive sensor 16 is not shifted in the axial direction at the time of assembly or preload setting, and the detection accuracy does not deteriorate. Since the axial clearance of the ball bearing is larger than the radial clearance, in the conventional configuration as shown in FIG. 6, the positional deviation between the sensor and the member to be detected is likely to be large. Not at all.
[0019]
Moreover, according to this embodiment, since the axial direction of the 1st holding member 15 can be performed by the flange part 15b, the attachment to the bearing of the 1st holding member 15 can be performed correctly and easily. The first holding member 15 provided with the flange portion 15b is attached to the outer ring 11 which is a stationary wheel so that the flange portion 15b abuts on the end surface of the outer ring 11, and a magnetic sensitive sensor is attached to the first holding member 15. Since 16 is held, the magnetic sensor 16 can be operated very accurately.
Further, the leakage of the lubricant can be remarkably prevented by the bent portion 15 e provided in the first holding member 15. Furthermore, the labyrinth part is comprised by the 1st holding member 15, the magnetic sensitive sensor 16, and the sensor holding ring 17, and the 2nd holding member 18 and the multipolar magnet 19, and intrusion of foreign materials, such as dust, to a bearing space Can be remarkably prevented.
[0020]
In FIG. 3, the principal part enlarged view of the rolling bearing 20 with a sensor of 2nd Embodiment of this invention is shown. In the embodiments described below, members and the like having the same configurations and functions as those already described are denoted by the same or corresponding reference numerals in the drawings, and description thereof is simplified or omitted.
In the second embodiment shown in FIG. 3, a seal lip 21 is further provided at the tip of the bent portion 15e of the first holding member 15 in the first embodiment. As shown in FIG. 3, the seal lip 21 made of an elastic member such as rubber provided at the tip of the bent portion 15 e is in contact with the second holding member 18. The seal lip 21 seals the gap between the first holding member 15 and the second holding member 18.
[0021]
In FIG. 4, the principal part enlarged view of the rolling bearing 30 with a sensor of 3rd Embodiment of this invention is shown. Also in this embodiment, the outer ring 11 is a stationary wheel and the inner ring 12 is a rotating wheel.
In the third embodiment shown in FIG. 4, the magnetic sensor 16 as a sensor is held by the first holding member 35 fixed to the outer ring 11, and the second holding member 38 fixed to the inner ring 12 is used as a member to be detected. A multipolar magnet 19 is held.
The first holding member 35 is connected to the mounting portion 35a fitted to the inner surface of the outer ring 11, the flange portion 35b connected to the mounting portion 35a and extending in the radial direction while contacting the end surface of the outer ring, and the flange portion 35b. It has a sensor holding part 35c extending in the axial direction at the same radial position as the attachment part 35a, and a bent part 35e provided on the opposite side of the attachment part 35a from the flange part 35b side. The sensor holding ring 17 is attached to the inner peripheral surface of the sensor holding portion 35 c, and the magnetic sensor 16 is held on the inner peripheral surface of the sensor holding ring 17.
The second holding member 38 extends in the radial direction, and a base end portion (inner peripheral portion) thereof is caulked and fixed to a groove formed on the outer diameter surface of the inner ring 12, and a distal end portion of the connection portion 38a ( A member-to-be-detected holding portion 38b extending in the axial direction at a radial position closer to the inner circumference than the outer circumference). The connecting portion 38a is bent in a U shape without a gap and extends in the radial direction, and also functions as a seal member. The multipolar magnet 19 is held on the outer peripheral surface of the detected member holding portion 38b.
[0022]
In FIG. 5, the principal part enlarged view of the rolling bearing 40 with a sensor of 4th Embodiment of this invention is shown. Also in this embodiment, the outer ring 41 is a stationary wheel and the inner ring 12 is a rotating wheel.
In the fourth embodiment shown in FIG. 5, the outer ring 41 has an outer ring extension 41 a that extends in the axial direction. The end face of the outer ring extension 41 a is located on the opposite side (right side in the drawing) from the end face of the multipolar magnet 19 held by the second holding member 18. The first holding member 45 extends in the radial direction, and its base end portion (outer peripheral portion) is caulked and fixed to a groove formed on the inner diameter surface of the outer ring extension portion 41. A sensor holding ring 17 is attached to the distal end portion (inner peripheral portion) of the first holding member 45. A magnetic sensitive sensor 16 is held on the outer peripheral surface of the sensor holding ring 17.
[0023]
Note that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
For example, a temperature sensor or a vibration sensor may be used as the sensor.
[0024]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a sensor-equipped rolling bearing capable of maintaining accurate detection accuracy even when a load that presses the end face of the raceway ring is applied.
[Brief description of the drawings]
FIG. 1 is an overall schematic diagram of a first embodiment.
FIG. 2 is an enlarged view of a main part of the first embodiment.
FIG. 3 is an enlarged view of a main part of a second embodiment.
FIG. 4 is an enlarged view of a main part of a third embodiment.
FIG. 5 is an enlarged view of a main part of a fourth embodiment.
FIG. 6 is a schematic view showing a conventional rolling bearing with a sensor.
[Explanation of symbols]
10 Rolling bearing with sensor 11 Outer ring 12 Inner ring 13 Ball (rolling element)
15 First holding member 15a Mounting portion 15b Flange portion 15e Bending portion 16 Magnetic sensitive sensor (sensor)
18 Second holding member 19 Multi-pole magnet (detected member)

Claims (3)

An inner ring that is a rotating wheel, an outer ring that is a stationary wheel, a rolling element that is a ball interposed between the inner and outer rings , a sensor that is provided on one axial side of the outer ring , and a sensor that is sensed by the sensor. A sensor-equipped rolling bearing that is used by being press-fitted into a housing and having a larger axial clearance than a radial clearance .
The sensor is held in the outer ring via the first holding member, the detection member is held in the inner ring via the second holding member, an outer ring end surface on which the first holding member is provided, the first It can be pressed in the axial direction by a flange portion that is provided on the holding member and extends in the radial direction while being in contact with the outer ring end face,
The first holding member attached to the outer ring has a bent part that is bent so as to rise in the radial direction at the tip of a cylindrical attaching part fitted to the inner diameter surface of the outer ring,
The detected member is constituted by an annular magnet, and adjoins a first portion having a plurality of magnetic poles alternately in the circumferential direction and a second portion whose magnetization pattern is different from the first portion in the axial direction,
The sensor have a two sensors opposite the first portion and the respective radially second part of the detection member,
The sensor held by a sensor holding ring attached to the first holding member is disposed on the inner diameter side of the detected member held by the second holding member, and the inner ring includes the sensor and the sensor A rolling bearing with a sensor, characterized by having an end face located on the inner peripheral side of the sensor holding ring . The tip of the bent portion, the plane of the rolling element side extending in a radial direction of the second holding member to which the attached to the inner ring to be rotating ring wall, in claim 1 which protrudes inverted body side Rolling bearing with sensor as described. The rolling bearing with a sensor according to claim 1 or 2 , wherein the sensor and the member to be detected are held by the first holding member and the second holding member so as to face each other in the radial direction.

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