JP5141877B2 - Rolling bearing device with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device with a sensor fixed to prevent deviation of the sensor in position and attitude, in regard to a structure for fixing the sensor to the bearing device. <P>SOLUTION: An annular member 10 for fixing a sensor 20 to a bearing device is formed with a first fixing portion 11 and a second fixing portion 13, and the first fixing portion 11 is formed with a pushing part 12 for pushing the sensor 20 to the annular member. The pushing part 12 and the sensor 20 are arranged without forming a gap between them. Further, the second fixing portion 13 is formed with a rail, and the rail is inserted into a rail groove 26 formed on the sensor. The rail groove 26 is formed to a tip of the sensor 20 for positioning of the sensor 20. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a rolling bearing device with a sensor.

  In measuring rotational motion in various devices, a bearing device may be equipped with a measurement mechanism. For example, when an ABS mechanism is configured for a vehicle axle drive wheel, an ABS sensor that detects a rotational speed is often fixed to a bearing device. In that case, the ABS sensor is fixed to the cover member fitted to the outer diameter of the normal bearing non-rotating wheel, and the ABS sensor detects the rotational speed by the change in magnetic flux density caused by the rotation of the magnet rotor fitted to the rotating wheel.

  Various proposals have been made regarding the mounting method of the ABS sensor. For example, Patent Document 1 below discloses an attachment method from the viewpoint of facilitating attachment / detachment of an ABS sensor. In the attachment method of Patent Document 1, the sensor is held in a holding case, and the holding case is attached to a cover fitted to the bearing fixed ring by a restraining member using elasticity.

JP-A-9-304417

  However, inspection and repair of the ABS sensor are not frequently performed. Therefore, it is very rare to remove the ABS sensor from the bearing device. Therefore, the prior art disclosed in Patent Document 1 and the like for the purpose of mounting the ABS sensor on the bearing device so as to be easily removed has a problem in setting the problem.

  Further, if importance is attached to the ease of removal of the ABS sensor, the ABS sensor tends to be insufficiently fixed, and as a result, the position and orientation of the ABS sensor may be shifted during use. The fact that the ABS sensor is not in a normal position or posture leads to a reduction in rotational speed detection performance by the ABS sensor, and the reliability of the measured value is reduced.

  In addition, as a typical method for attaching the ABS sensor, when the cover member is fitted to the non-rotating ring of the rolling bearing and the ABS sensor is fixed to the cover member, the ABS sensor is pressed against the cover member by elastic deformation. There is a method of fixing the ABS sensor by forming a portion. In this case, emphasizing ease of removal leads to forming a gap between the pressing portion and the ABS sensor. If foreign matter or ice accumulates in this gap, there is a risk that the ABS sensor will come off. As described above, attaching the ABS sensor easily causes various problems.

  Therefore, in view of the above problems, the problem to be solved by the present invention is a rolling bearing device with a sensor which is fixed without being displaced while the position and posture of the sensor are used in a structure in which the sensor is fixed to the bearing device. Is to provide.

Means for Solving the Problems and Effects of the Invention

In order to solve the above-described problems, a rolling bearing device with a sensor according to the present invention detects a magnetic body attached so that a magnetic field alternately changes along a circumferential direction of a rotating wheel, and detects the magnetic field of the magnetic body. A sensor-equipped rolling bearing device having a sensor fixed to a non-rotating wheel so as to measure the rotational speed of the rotating wheel, comprising an annular member for fixing the sensor to the non-rotating wheel, the annular member being A cylindrical portion fitted to the non-rotating wheel, and an extending portion that extends from the axially outer end of the cylindrical portion in the radial direction and in the direction of the rotating wheel. The portion does not have an opening through which the magnetic body is exposed from the axial direction, and the cylindrical portion is in the fitted state, and the surface facing the non-rotating wheel end surface in the extended portion is a first surface, The back surface of the first surface is the second surface, and the first surface side is parallel to the axis. The direction towards the al second surface side and forward, wherein the sensor comprises a body portion having a measuring unit, a part of the circumferential direction of the second surface of the extended portion, to fix the body portion of the sensor For this purpose, a fixing part formed separately from the annular member is joined , and the fixing part has a first fixing part, and the first fixing part extends in the forward direction from the second surface of the extending part. A pressing portion is formed at an extended and bent portion, and the pressing portion is fixed by pressing the main body portion of the sensor against the extending portion by an elastic restoring force of the first fixing portion, and the pressing portion Is a shape that does not form a gap between the main body portion and the pressing portion when the main body portion is pressed, and the main body portion of the sensor is pressed and fixed to the extending portion by the pressing portion. The surface of the main body of the sensor The end on the side with the rotating wheel in the radial direction is the tip, and the two surfaces that are the end faces in the circumferential direction are side surfaces, and rail groove portions are formed on both side surfaces of the sensor body in a direction perpendicular to the axis. The fixing portion has a second fixing portion, and the second fixing portion is located on the second surface from two positions sandwiching the body portion of the sensor pressed by the first fixing portion from the circumferential direction. Extending in the forward direction and bent, a rail portion is formed at an end portion , the rail portion is fitted into the rail groove portion, the rail groove portion is formed from the middle of the side surface to the tip, and the rail portion is The rail groove is fitted to the position of the tip, and an end surface opposite to the tip of the rail groove is used as a rail groove end surface. When the pressing portion presses the main body, the main body is radially inward. The rail part is When a rail groove end surface is pushed to exert a radially outward force on the main body portion, when the rail portion and the rail groove portion are fitted, a gap is not formed between the rail portion and the rail groove portion. The second fixing portion sandwiches the main body of the sensor from both side surfaces, and a drain hole is formed in a part of the circumferential direction in the extending portion, and the inner diameter of the drain hole is equal to or larger than the outer diameter of the magnetic body. It is characterized by being.

  Thereby, in the bearing device with a sensor according to the present invention, the annular member is fitted to the non-rotating wheel, the sensor is fixed by the fixing portion formed on the annular member, and the main body of the sensor is turned into the annular member at the fixing portion. Since the shape of the pressing portion to be pressed is a shape that does not form a gap with the main body portion, it is possible to suppress foreign matters from being mixed between the sensor and the pressing portion. Therefore, foreign substances and ice accumulate in the gap between the sensor and the member that fixes the sensor while it is used like a conventional bearing device with a sensor. It is possible to prevent the sensor from coming off. Therefore, the sensor-equipped bearing device has high reliability with respect to the measurement value of the sensor even in long-term use.

  Further, in the state where the main body of the sensor is pressed and fixed to the extended portion by the pressing portion, the end on the side where the rotating wheel is present in the radial direction is out of the surface of the main body of the sensor, Two sides which are end faces in the circumferential direction are side surfaces, rail groove portions are formed on both side surfaces of the main body portion of the sensor in a direction perpendicular to the axis, and the fixing portion has a second fixing portion. The two fixing portions extend in the forward direction from two positions on the second surface that sandwich the main body of the sensor pressed by the first fixing portion from the circumferential direction, and are bent to form a rail portion at the tip. The rail groove is fitted to the rail groove, the rail groove is formed from the middle of the side surface to the tip, the rail is fitted to the position of the tip of the rail groove, and the rail groove Opposite to the tip The surface is a rail groove end surface, and when the pressing portion presses the main body portion, a radially inward force is applied to the main body portion, and the rail portion presses the rail groove end surface to radially outward the main body portion. When the rail portion and the rail groove portion are fitted to each other, a gap is not formed between the rail portion and the rail groove portion, and the second fixing portion is attached to the main body portion of the sensor. It may be clamped from both sides.

  Accordingly, by fitting the rail portion formed in the extending portion and the rail groove portion formed in the main body portion of the sensor, in addition to not forming a gap between the pressing portion and the sensor, Sensor fixing is stabilized. In particular, by forming the rail groove part to the tip of the main body part and fitting the rail part and the rail groove part to the tip part, only the ease of sensor installation is considered without forming the rail groove part to the tip as in the past. Compared with the case where it was, the position of the main part of the sensor in the axial direction, the stability of the posture, and the stability are enhanced. Further, the pressing part pushes the main body part radially inward, the rail part pushes the rail groove end face radially outward, and the main body part is subjected to a pushing force from both the radial direction. The fixation and stability of the radial position of the are increased. And when the rail part and the rail groove part are fitted together, a gap is not formed between them, so that the position and posture fixability and stability of the sensor in the circumferential direction are enhanced. As described above, by forming the rail portion and the rail groove portion, the axial direction, the radial direction, the circumferential position, the posture fixing property and the stability of the main body portion of the sensor are enhanced. Thereby, the reliability with respect to the measured value of a sensor improves.

  The extending portion may be extended so that an inner diameter of the extending portion is smaller than an inner diameter of the magnetic body and an outer diameter of the extending portion is larger than an outer diameter of the magnetic body. . As a result, the outer diameter and inner diameter of the extended portion of the annular member are set so that the extended portion covers the magnetic body, so that foreign matters are prevented from being mixed from the outside and adhering to the magnetic body. Therefore, the reliability of detection of the magnetic field of the magnetic material by the sensor is increased. Therefore, a sensor-equipped bearing device with high reliability of the measurement value by the sensor can be configured in combination with the improvement of the fixing property and stability of the sensor.

  The extending portion may be formed with an abutting surface that abuts against the end surface of the non-rotating wheel in a state in which the cylindrical portion of the annular member is fitted and attached to the non-rotating wheel. As a result, since the annular member can be positioned by abutting the abutting surface against the end surface of the non-rotating wheel, the positioning of the annular member is stable compared to the conventional technique in which the abutting surface is not formed on the annular member. It becomes a bearing device with a sensor. Therefore, since the position and posture of the sensor are prevented from shifting due to the wobbling of the annular member, the reliability of the measured value of the sensor can be further improved.

  The extending portion has a cover surface that covers the magnetic body from the axial direction, and the cover surface is formed at a position axially outward from the abutting surface, and between the cover surface and the magnetic body. A gap may be formed in. As a result, a gap is formed between the covering surface and the magnetic body, so that even if foreign matter is mixed between the annular member and the magnetic body, the foreign matter is accumulated between the annular member and the magnetic body. Can be suppressed. Therefore, since it prevents that a sensor obtains the wrong measured value when a foreign material adheres to a magnetic body, it can be considered as a bearing device with a sensor with high reliability to the measured value of a sensor.

  A drain hole for drainage may be formed in the extended portion without abutting a part of the abutting surface against the end surface of the non-rotating wheel. As a result of the drain hole being formed, muddy water that has entered the bearing device can be discharged to the outside, so that contamination of the sensor and magnetic material due to muddy water is reduced, so that the sensor may obtain an erroneous measurement value due to contamination. It is suppressed. Therefore, it is possible to provide a sensor-equipped bearing device with high reliability with respect to the measured value of the sensor.

  The drain hole may be formed at a position where the magnetic body is not exposed in the axial direction from the drain hole. Accordingly, since the magnetic body is not exposed in the axial direction from the drain hole, the possibility that foreign matters mixed from the drain hole adhere to the magnetic body is reduced. Therefore, since it is suppressed that a foreign substance adheres to a magnetic body and a sensor obtains a wrong measured value, it can be considered as a bearing device with a sensor with high reliability to a measured value of a sensor.

  In the annular member, a part other than the fixed part is used as a cover part, and the cover part and the fixed part are joined after being formed as separate bodies, and the cover part does not expose the magnetic body in the axial direction. It is also possible to cover the entire circumference. As a result, in the prior art, the fixed part and the cover part were integrally molded, so that an opening was inevitably formed in a part of the cover part, and the magnetic body was exposed from the opening. Unlike the case, the cover portion covers the entire circumference without exposing the magnetic body in the axial direction. Therefore, it is possible to prevent the sensor from obtaining an erroneous measurement value due to foreign matter adhering to the magnetic body from the outside, and thus a highly reliable bearing device with a sensor for the sensor measurement value can be obtained.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an axial sectional view of a rolling bearing device with a sensor 1 (bearing device) according to the present invention. The bearing device 1 rotatably supports a vehicle axle driving wheel, an inner ring 3 that fits on an axle shaft 2 (shaft) and rotates integrally with the shaft, an outer ring 4 fixed to the vehicle body, and an inner ring 3. And rolling elements 5 (rollers) sandwiched between the raceway surface formed on the outer ring 4 and the raceway surface formed on the outer ring 4. The left side of FIG. 1 is the wheel side, and the right side of FIG. 1 is the vehicle center side.

  A seal 6 is disposed on the outer side (wheel side) of the bearing device 1 to prevent foreign matter from entering the bearing from the outside. A magnet rotor 7 (magnetic body) made of a permanent magnet is fitted on the inner ring 3 on the outer side of the seal 6. The magnet rotor 7 has a structure in which N poles and S poles are alternately arranged along the circumferential direction. The magnetic flux density is changed by the rotation of the shaft 2 and the inner ring 3, and the ABS sensor 20 (sensor) described later changes this change. The rotation speed is measured by detecting.

  A ring-shaped annular member 10 for fixing the sensor 20 to the bearing device 1 is fitted on the outer ring 4. A sensor 20 is fixed to the annular member 10. The method of fixing the sensor 20 to the annular member 10 is a main part of the present invention, and will be described below.

  FIG. 2 is a perspective view of the bearing device 1, and FIG. 4 is a view showing only the sensor 20, and FIG. 5 is an enlarged view of a main part showing only the annular member 10. As shown in FIG. The sensor 20 shown in FIG. 4 is roughly divided into a main body 21 and a signal line 22. The main body 21 is provided with a detection unit that detects the magnetic flux density. A signal carrying the measured value is sent to the ECU mounted on the vehicle through the signal line 22.

  The surface of the main body 21 includes a tip 24, an upper surface 23, and side surfaces 25. The main body 21 has another side surface, which is a surface on the back side of the side surface 25 in a portion not shown in FIG. Further, the surface on the back side of the upper surface 23 and not shown in FIG. As shown in FIG. 3, the sensor 20 is fixed to the annular member 10 with the tip 24 directed radially inward and the bottom surface directed to the annular member 10.

  As shown in FIG. 4, a rail groove 26 is formed on the side surface 25 from the middle of the side surface 25 to the tip 24. It is assumed that the rail groove is formed in the same shape on both side surfaces. The end surface opposite to the tip 24 of the rail groove 26 is defined as a rail groove end surface 26a. Further, as shown in FIG. 4, a recess 23 a is formed on the upper surface 23.

  The annular member 10 shown in FIG. 5 has a cylindrical portion 10a for externally fitting to the outer ring 4, and an extending portion 10b that extends radially inward from the end of the cylindrical portion 10a. And the 1st fixing | fixed part 11 and the 2nd fixing | fixed part 13 are formed in the surface outside the bearing apparatus of the extending part 10b as a site | part for fixing the sensor 20. As shown in FIG. The first fixing portion 11 is formed in a shape curved from the axially outer surface (the surface far from the bearing, that is, the left side surface in FIG. 1) of the extending portion 10 b, and has a pressing portion 12. .

  The 1st fixing | fixed part 11 has elasticity, and fixes a sensor by pressing the sensor 20 with the elastic restoring force of the 1st fixing | fixed part elastically deformed. The pressing portion 12 is formed with a bent portion 12a, which has a shape that matches the concave portion 23a of the main body portion 21 described above. Therefore, when the pressing portion 12 presses the upper surface 23 of the main body portion 21, the concave portion 23 and the bent portion 12a are fitted and come into contact with no gap. The shape of the entire pressing portion 12 including that is designed so that no gap is formed when the upper surface 23 is pressed.

  The second fixing portion 13 is formed in a shape that extends from two locations on the axially outer surface of the extending portion 10b toward the axially outward direction and is bent from the middle, and a rail portion 14 is formed at the tip. . When the sensor 20 is inserted from the outside in the radial direction, the rail portion 14 is inserted into the rail groove portion 26 described above. The rail portion 14 is inserted to a position where the end portion is in contact with the rail groove end surface 26a.

  When the pressing portion 12 presses the sensor 20, a force directed inward in the radial direction is applied due to the presence of the concave portion 23a and the bent portion 12a. Due to this force, a radially inward force acts on the main body portion 21 of the sensor 20, and conversely, the rail groove end surface 26 a receives a radially outward force from the rail portion 14. Due to the two forces inward and outward in the radial direction, the main body portion 21 is positioned in the radial direction, and movement in the same direction is restricted.

  In addition, the dimensions of the rail portion 14 and the rail groove portion 26 are designed so that no gap is formed between the rail portion 14 and the rail groove portion 26 during the insertion, thereby positioning the main body portion 21 in the circumferential direction. The movement in the circumferential direction is restricted. Further, the pressing portion 12 pushes the main body portion 21 inward in the axial direction (the direction toward the inner side of the bearing, that is, the right side in FIG. 1), thereby applying a force inward in the axial direction, and conversely the rail portion. 14 pushes back the main body 21 in the opposite direction, that is, outward in the axial direction, thereby positioning the main body 21 in the axial direction and restricting movement in the axial direction.

  A sensor hole 10c is formed in the extended portion 10b, and the sensor 20 directly faces the magnet rotor 7 through the hole 10c. Thereby, the rotation speed can be measured. The annular member 10 has an opening 19. The annular member may be electrodeposition coating, surface treatment by plating, or galvanized steel sheet. Thereby, it will have rust prevention property.

  Next, FIG. 6 shows an enlarged view of the lower half of FIG. As shown in FIG. 2 and FIG. 2, the annular member 10 has a ring-shaped annular member 10 that has a fitting surface 15 that fits on the outer ring 4 as an inner circumferential surface of the cylindrical portion 10 a and an outermost circumference of the extending portion 10 b. An abutting surface 16 that is formed on the outer ring and is abutted against the end surface 4a of the outer ring, and a covering surface 17 that covers the magnet rotor 7 is formed on the inner peripheral side thereof.

  The abutting surface 16 is formed and abutted against the outer ring end surface 4a, whereby the annular member 10 is positioned in the axial direction. The covering surface 17 covers the magnet rotor 7 along the circumferential direction with a gap therebetween. The inner diameter φa of the cover surface 17 is set to be equal to or smaller than the inner diameter φb of the magnet rotor 7. As a result, the cover surface 17 prevents the magnet rotor 7 from being exposed to the outside.

  Thereby, it is possible to prevent foreign matters from being mixed in and attached to the magnet rotor 7 from the outside. In addition, since the gap c is formed between the magnet rotor 7 and the cover surface 17, even if foreign matter is mixed in, the accumulation between the magnet rotor 7 and the cover surface 17 is suppressed. The shape of the covering surface 17 improves the reliability of the magnet rotor 7 in long-term use.

  7 and 8 show a first modification of the above embodiment, which will be described below. In the rolling bearing device with sensor 1b (bearing device) of the first modified example, a drain hole 18 for drainage is formed in the lower part of the annular member in the figure. The lower part illustrated in FIGS. 7 and 8 may correspond to the lower part when the bearing device 1b is actually mounted on the vehicle. Through this drain hole 18, muddy water or the like that has entered the bearing device 1 b can be discharged to the outside.

  As shown in FIG. 8, the inner diameter φe of the drain hole 18 is equal to or larger than the outer diameter φd of the magnet rotor 7. This suppresses the magnet rotor 7 from being exposed to the outside due to the presence of the drain hole 18. Accordingly, since foreign matters are prevented from entering and adhering to the magnet rotor 7 through the drain hole 18 from the outside, the reliability of the magnet rotor 7 in long-term use is improved.

  A second modification is shown in FIGS. 9, 10, and 11. FIG. 9 shows a perspective view of the sensor-equipped rolling bearing device 1c according to the second modification. In the sensor-equipped rolling bearing device 1c, the annular member 10 described above is formed separately on the fixed portion 35 and the cover portion 30 and joined later. 10 shows the cover part 30 and FIG. 11 shows the fixing part 35.

  As shown in FIG. 10, the cover portion 30 has a shape in which the first fixing portion 11 and the second fixing portion 13 are removed from the annular member 10, roughly speaking. Similar to the annular member 10, a sensor hole 31 and a drain hole 18 are formed in the cover 30.

  As shown in FIG. 11, the fixing portion 35 has a hole portion 37, a first fixing portion 11, and a second fixing portion 13 formed on the plate portion 36. The shape of the first fixing part 11, the pressing part 12, and the presence of the bent part 12 a are the same as when formed on the annular member 10. The shape of the second fixing portion 13 and the presence of the rail portion 14 are the same as when formed on the annular member 10. The hole portion 37 is disposed at a position overlapping the sensor hole portion 31, and the fixing portion 35 is welded or bonded to the cover portion 30.

  Clearly comparing FIG. 2 and FIG. 7 with FIG. 9, there is no opening 19 in the sensor-equipped bearing device 1c of FIG. As shown in FIGS. 2 and 9, the opening 19 is inevitably formed when the annular member 10 is manufactured in one process. The magnet rotor 7 is exposed to the outside due to the presence of the opening 19.

  On the other hand, in FIG. 9, the cover part 30 and the fixing part 35 are formed as separate members, and then both are welded or bonded, so that it is possible not to form an opening in the cover part 30. Since it can avoid that the magnet rotor 7 is exposed to the outside by this, since it suppresses that a foreign material mixes in from the outside and adheres to the magnet rotor 7, the reliability in the long-term use of the magnet rotor 7 improves. In addition, the cover part 30 and the fixing | fixed part 35 may form a hole part in both, and may fix it by bolt fastening or rivet caulking.

The axis parallel sectional view of the rolling bearing device with a sensor concerning the present invention. The perspective view of a rolling bearing device with a sensor. The principal part enlarged view of a rolling bearing apparatus with a sensor. The perspective view of a sensor. The principal part enlarged view of an annular member. The principal part enlarged view of FIG. The perspective view of the rolling bearing apparatus with a sensor in the modification 1. FIG. The principal part enlarged view of the axial parallel sectional view of the rolling bearing device with a sensor of the modification 1. FIG. The perspective view of the rolling bearing apparatus with a sensor in the modification 2. FIG. The perspective view of the cover part in the modification 2. FIG. The perspective view of the fixing | fixed part in the modification 2. FIG.

Explanation of symbols

1, 1b, 1c Rolling bearing device with sensor 2 axis (axle shaft)
3 Inner ring 4 Outer ring 5 Rolling element (roller)
6 Seal 7 Magnet rotor (magnetic material)
DESCRIPTION OF SYMBOLS 10 Ring member 11 1st fixing | fixed part 12 Pushing part 13 2nd fixing | fixed part 14 Rail part 15 Fitting surface 16 Abutting surface 17 Covering surface 18 Drain hole 20 ABS sensor (sensor)
21 Body portion 26 Rail groove portion 30 Cover portion 35 Fixed portion

Claims (3)

Fixed to a non-rotating wheel so as to measure the rotational speed of the rotating wheel by detecting the magnetic field of the magnetic body and the magnetic body mounted so that the magnetic field alternately changes along the circumferential direction of the rotating wheel A rolling bearing device with a sensor having a sensor,
An annular member for fixing the sensor to the non-rotating wheel is provided, and the annular member rotates in a radial direction from an axially outer end of the cylindrical portion and the cylindrical portion fitted to the non-rotating wheel. An extended portion that extends in a direction in which the ring exists, and the extended portion does not have an opening that exposes the magnetic body from the axial direction.
In the state where the cylindrical portion is fitted, a surface facing the non-rotating wheel end surface in the extended portion is a first surface, and a back surface of the first surface is a second surface.
A direction parallel to the axis and going from the first surface side to the second surface side is a forward direction,
The sensor includes a main body having a measurement unit,
A fixing portion formed separately from the annular member for fixing the main body portion of the sensor is joined to a part of the second surface of the extending portion in the circumferential direction , and the fixing portion is a first fixing portion. Have
The first fixing portion has a shape in which a pressing portion is formed in a portion that extends in the forward direction from the second surface of the extending portion and is bent, and the pressing portion is formed by an elastic restoring force of the first fixing portion. The main body of the sensor is fixed by pressing against the extended portion,
The shape of the pressing portion is a shape that does not form a gap between the main body portion and the pressing portion when pressing the main body portion,
In the state in which the main body of the sensor is pressed against and fixed to the extension by the pressing portion, the end of the surface of the main body of the sensor on the side where the rotating wheel is provided in the radial direction is the tip and the circumference. Two sides that are end faces in the direction are side surfaces,
Rail groove portions are formed on both side surfaces of the sensor body in a direction perpendicular to the axis,
The fixing portion has a second fixing portion, and the second fixing portion is arranged in the order from two positions on the second surface that sandwich the body portion of the sensor pressed by the first fixing portion from the circumferential direction. A rail portion is formed at the end by extending and bending in the direction, and the rail portion is fitted into the rail groove portion,
The rail groove is formed from the middle of the side surface to the tip, and the rail is fitted to the position of the tip of the rail groove,
An end surface opposite to the front end side of the rail groove portion is a rail groove end surface, and when the pressing portion presses the main body portion, a force inward in the radial direction is applied to the main body portion. Press the surface to apply a radially outward force to the main body,
When the rail portion and the rail groove portion are fitted, a gap is not formed between the rail portion and the rail groove portion, and the second fixing portion sandwiches the main body of the sensor from both sides,
A rolling bearing device with a sensor, wherein a drain hole is formed in a portion of the extending portion in a circumferential direction, and an inner diameter of the drain hole is equal to or larger than an outer diameter of the magnetic body.   2. The extension portion according to claim 1, wherein the extension portion is extended so that an inner diameter of the extension portion is smaller than an inner diameter of the magnetic body and an outer diameter of the extension portion is larger than an outer diameter of the magnetic body. Rolling bearing device with sensor.   The extending portion has a covering surface that covers the magnetic body from the axial direction, and an axial direction from the cylindrical portion to the covering surface is formed so that a gap is formed between the covering surface and the magnetic body. The rolling bearing device with a sensor according to claim 1, further comprising an axially extending portion extending toward the sensor.

Images