JP2004251458A - Rolling bearing unit with rotating speed detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow easy mounting/demounting of a holding case 32 holding a sensor on/from a cover 24 fitted and fixed to a fixed outer ring 2a and prevent the entry of foreign matter into the cover 24 through a mounting portion of the holding case 32. <P>SOLUTION: An insertion portion 34 of the holding case 32 is inserted into a mounting hole 33 formed in a cylindrical wall portion 30 of the cover 24. A pressure frame portion 41 of a pressure member 39 pivotally supported at its end on the cylindrical wall portion 30 is used for pressing a base portion 35 of the holding case 32 against the outer peripheral face of the cylindrical wall portion 30. An O-ring 38 blocks a space between the base portion 35 and the outer peripheral face of the cylindrical wall portion 30 to prevent the entry of foreign matter into the cover 24. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a rolling bearing unit with a rotation speed detection device, which rotatably supports a wheel of an automobile with respect to a suspension device and uses the rotation speed of the wheel.

  In order to control an anti-lock brake device (ABS) or a traction control device (TCS), it is necessary to detect a rotation speed of a wheel rotatably supported by a suspension device. Various types of rolling bearing units with a rotation speed detecting device used for this purpose have been known in the past.However, as a structure for facilitating inspection and repair work by making it easy to attach and detach the sensor, Thus, for example, the one described in Patent Document 1 is known. FIG. 7 shows a rolling bearing unit with a rotation speed detecting device described in Patent Document 1.

  An inner ring 1 as a rotating wheel is rotatably supported inside an outer ring 2 as a fixed wheel. For this purpose, an inner raceway 3 which is a rotating raceway surface is formed on the outer circumferential surface of the inner race 1 which is a rotating circumferential surface, and an outer raceway which is a fixed raceway surface is formed on the inner circumferential surface of the outer race 2 which is a fixed circumferential surface. 4 are formed. A plurality of rolling elements 5 are provided between the inner raceway 3 and the outer raceway 4. An annular tone wheel 6 is externally fitted and fixed to the outer peripheral surface of the end of the inner ring 1, and a seal ring 7 and a holding ring 8 are internally fixed to the inner peripheral surface of the end of the outer ring 2. That is, the locking projection 9 formed on the holding ring 8 is engaged with the locking recess 11 formed on the inner peripheral surface of the end of the outer ring 2 through the through hole 10 formed on the seal ring 7. The sensor 12 supported by the holding ring 8 faces the side surface of the tone wheel 6. The magnetic properties of the side surface of the tone wheel 6 change alternately and at equal intervals in the circumferential direction. The output of the sensor 12 changes in accordance with the change in the magnetic characteristics. The frequency at which the output of the sensor 12 changes in this manner is proportional to the rotation speed of the inner ring 1. Therefore, if the output of the sensor 12 is input to the controller, ABS and TCS can be controlled.

  In the case of the conventional structure shown in FIG. 7, the sensor 12 can be attached to the end of the outer ring 2 which is a fixed ring without using a special pushing jig or the like. There is no built-in seal structure. That is, the seal ring 7 separates the portion where the rolling elements 5 are installed from the outside, but does not separate the portion where the tone wheel 6 and the sensor 12 are installed from the outside. Therefore, during rainfall or the like, there is a possibility that water droplets may remain in the minute gap 13 between the tone wheel 6 and the sensor 12. If the vehicle is started in a cold state with the water drops frozen, one or both of the tone wheel 6 and the sensor 12 may be damaged.

U.S. Pat. No. 4,946,295

  In view of such circumstances, the rolling bearing unit with a rotation speed detection device of the present invention has been developed in order to realize a structure that can easily perform attachment / detachment work of the sensor and that can prevent damage to the sensor and the tone wheel due to freezing of water droplets. It was done.

  The rolling bearing unit with the rotation speed detecting device of the present invention comprises, similarly to the above-described conventional rolling bearing unit with the rotation speed detecting device, a fixed wheel that has a fixed side raceway surface on a fixed side peripheral surface and does not rotate during use, and A rotating wheel that has a rotating raceway surface on a side peripheral surface and rotates during use, a plurality of rolling elements provided between the fixed raceway surface and the rotating raceway surface, and the whole is formed in an annular shape, It has a flange surface which is supported by the rotating wheel and is perpendicular to the axis of the rotating wheel, and the characteristics of the flange surface are changed alternately and at regular intervals in the circumferential direction. A tone wheel, a cover fixed to an end of the fixed wheel and closing an end opening of the fixed wheel, and a sensor supported by the cover and facing a flange surface of the tone wheel.

  In particular, in the rolling bearing unit with the rotation speed detecting device of the present invention, the inner peripheral surface and the outer peripheral surface of the cylindrical wall portion are formed on a cylindrical wall portion that is part of the cover and is diametrically outside the tone wheel. And a mounting hole for communicating with. Further, the holding case holding the sensor has an insertion portion in which the mounting hole is inserted from the outer diameter side to the inner diameter side of the cylindrical wall portion, and a peripheral portion of the mounting hole on the outer peripheral surface of the cylindrical wall portion. And a base to be abutted. The base is opposed to the outer peripheral surface of the cylindrical wall in a state where the insertion portion is inserted into the mounting hole, and a gap between the holding case and the mounting hole is sealed by a seal member. Further, at a position near the mounting hole on the outer peripheral surface of the cylindrical wall portion, a base end portion of a holding member for holding the base of the holding case toward the outer peripheral surface of the cylindrical wall portion is pivotally mounted, The base of the holding case is elastically pressed toward the outer peripheral surface of the cylindrical wall by the tip of the holding member.

In the case of the rolling bearing unit with the rotation speed detecting device of the present invention configured as described above, the wheel is rotatably supported on the suspension device by the same operation as the conventional structure described above, and the wheel Detect the rotation speed.
When the sensor is mounted on the fixed wheel, the insertion portion of the holding case is inserted into the cover through the mounting hole, and the sensor held by the holding case is opposed to the flange surface of the tone wheel. Next, the base of the holding case is held down by the tip of the holding member which has been retracted to the side, and this base is held down on the outer peripheral surface of the cylindrical wall constituting the cover. If the rotating wheel is rotated in this state, the output signal of the sensor changes with the rotation of the rotating wheel. If the output signal of the sensor is taken out by a harness and sent to the controller, ABS and TCS can be controlled. .
Further, since the gap between the holding case and the mounting hole is sealed by a sealing member in a state where the holding case is mounted in the mounting hole, foreign matter passes through the space between the holding case and the mounting hole. Is prevented from entering. Therefore, it is possible to prevent the sensor and the tone wheel from being damaged by freezing.
For this reason, the present invention can realize a rolling bearing unit with a rotation speed detecting device that can easily attach and detach a sensor and prevent damage to the sensor and the tone wheel due to freezing of water droplets.

  1 to 4 show a first embodiment of the present invention. In this embodiment, the present invention is applied to a rolling bearing unit for supporting drive wheels (rear wheels of an FR vehicle, front wheels of an FF vehicle) on a suspension device. A flange 15 for fixing the wheel is provided on the outer peripheral surface of the outer end of the hub 14 which is a rotating wheel (the outer end in the width direction when assembled to a vehicle, the left end in FIG. 1). An inner raceway 3a, which is a rotation-side raceway surface, is formed at an intermediate portion of the outer peripheral surface of the hub 14 described above. The inner end of the hub 14 (the end that is the center in the width direction when assembled to the vehicle, the right end in FIG. 1) is provided on the outer peripheral surface, which is also the rotational side peripheral surface, An inner race 1a having an inner raceway 3b as a raceway surface is externally fitted and fixed. The inner end face (the right end face in FIG. 1) of the inner ring 1a protrudes more inward than the inner end face of the hub 14.

  When assembled to the vehicle, the step 17 of the constant velocity joint 16 abuts on the inner end surface of the inner ring 1a to prevent the inner ring 1a from being loosened. That is, a spline hole 18 is formed in the center of the hub 14, and a spline shaft (not shown) attached to the constant velocity joint 16 is inserted into the spline hole 18 when the hub 14 is assembled to a vehicle. Then, the hub 14 and the inner ring 1a are sandwiched in the axial direction between a nut (not shown) screwed to the tip of the spline shaft and the stepped portion 17.

  The outer ring 2a, which is a fixed wheel, has a mounting portion 19 for supporting a knuckle of a suspension device (not shown) on an outer peripheral surface, and double-row outer raceways 4a, 4b on an inner peripheral surface, which is a fixed side peripheral surface, respectively. Has formed. A plurality of rolling elements 5, 5 are provided between the outer raceways 4a, 4b, which are the fixed raceway surfaces, and the inner raceways 3a, 3b, respectively. The hub 14 is rotatably supported inside the outer ring 2a. Although balls are shown as the rolling elements 5 and 5 in the illustrated embodiment, tapered rollers may be used as rolling elements in the case of a heavy-duty rolling bearing unit for an automobile.

  Further, a tone wheel 6a is externally fixed to a portion of the inner end of the inner race 1a which is off the inner raceway 3b. The tone wheel 6a is formed by combining a support ring 20 and a tone wheel main body 21. The support ring 20 is formed by forming a metal plate such as a steel plate into an annular shape with an L-shaped cross section. The support ring 20 has a cylindrical portion 22 fitted and fixed to the inner end of the inner ring 1a. A ring 23 is bent at a right angle from the end edge outward in the diameter direction. The inner surface (the right side surface in FIG. 1) of the tone wheel main body 21 attached to the side surface of the circular ring portion 23 is a flange surface existing in a direction perpendicular to the axis of the hub 14. The whole tone wheel body 21 is formed in a ring shape by a permanent magnet such as a rubber magnet mixed with ferrite powder. The tone wheel main body 21 is magnetized in the axial direction (the left-right direction in FIG. 1). The magnetization directions are changed alternately at regular intervals in the circumferential direction. Therefore, S-poles and N-poles are arranged alternately and at equal intervals on the inner surface of the tone wheel main body 21 serving as a flange surface.

  A cover 24 is externally fitted and fixed to the open end of the outer race 2a. The entire cover 24 is formed in an annular shape by subjecting a metal plate such as a steel plate, a stainless steel plate, and an aluminum alloy plate to plastic working such as drawing. A fitting portion 25 for externally fixing the cover 24 to the opening end of the outer ring 2a is provided at a peripheral portion of the opening of the cover 24, and a circular hole for inserting the constant velocity joint 16 is provided at a central portion. 26 are formed respectively. A seal lip 27 made of an elastic material such as rubber or elastomer is attached to the inner peripheral edge of the circular hole 26 over the entire circumference. When assembled to the vehicle, the seal lip 27 slides on the outer peripheral surface of the constant velocity joint 16 to close a gap between the cover 24 and the constant velocity joint 16, and through this gap, rainwater enters the cover 24. To prevent foreign matter from entering.

  Further, a sensor mounting portion 29 is formed at a part of the intermediate portion 28 located between the fitting portion 25 and the circular hole 26 by expanding the intermediate portion inward in the axial direction. . The outer peripheral wall of the sensor mounting portion 29 becomes a cylindrical wall portion 30 that is located diametrically outward of the tone wheel 6a. A holding case 32 made of a synthetic resin, in which a sensor and an end of a harness 31 for extracting an output signal of the sensor are embedded and held, is attached to the cylindrical wall portion 30. The holding case 32 is inserted into the mounting hole 33 formed in the cylindrical wall portion 30 from the outer diameter side to the inner diameter side (from top to bottom in FIG. 1) of the cylindrical wall portion 30 without play. An insertion portion 34 and a base 35 having a larger diameter than the insertion portion 34 are provided. In the illustrated embodiment, the mounting hole 33 has a rectangular shape, the insertion portion 34 has a rectangular cross section, and the holding case 32 does not rotate when the insertion portion 34 is inserted into the mounting hole 33. I have.

  When the insertion portion 34 is inserted into the mounting hole 33 up to its base end, the inner end surface 36 of the base 35 (the end surface on the side where the insertion portion 34 is provided, the lower surface in FIG. 1) is The outer peripheral surface of the cylindrical wall portion 30 is brought into contact with the peripheral portion of the mounting hole 33. At a portion of the inner end surface 36 surrounding the base end of the insertion portion 34, a locking groove 37 surrounding the base end 34 over the entire circumference is formed. Further, an O-ring 38 as a sealing member is locked. The cross-sectional diameter of the O-ring 38 is larger than the depth of the locking groove 37. Accordingly, the O-ring 38 is elastically pressed against the outer peripheral surface of the cylindrical wall portion 30 with the inner end surface 36 abutting against the outer peripheral surface of the cylindrical wall portion 30, and the O-ring 38 is attached to the holding case 32 and the mounting hole. 33 is closed. The inner diameter of the O-ring 38 in the free state is slightly smaller than the diameter of the inner peripheral wall of the locking groove 37. Therefore, the O-ring 38 does not fall off while being locked in the locking groove 37 while the O-ring 38 is locked in the locking groove 37.

  The sensor is constituted by an IC in which a power supply circuit and a waveform shaping circuit are integrated with a detection element such as a Hall element or an MR element that changes an output signal in accordance with a change in the direction or density of a magnetic flux. . The power supply circuit adjusts the voltage applied to the detection element. Further, the waveform shaping circuit adjusts the waveform of the output signal of the detection element. Therefore, the harness 31 has a role of energizing the power supply circuit and a role of transmitting a waveform-shaped signal sent from the waveform shaping circuit to a controller of an ABS or a TCS.

  On the other hand, a restraining member 39 as shown in FIG. 3 is provided at a position near the mounting hole 33 on the outer peripheral surface of the cylindrical wall portion 30. The holding member 39 is formed by bending a wire-shaped wire having sufficient bending rigidity, and is formed by bending the outer end surface 40 of the base 35 of the holding case 32 (an end surface opposite to the side where the insertion portion 34 is provided). 1), pivoting portions 42, 42 provided at the base end portion, and a connecting portion 43 for connecting the retaining frame portion 41 and both pivoting portions 42, 42 to each other. , 43. Each of the pivot portions 42, 42 is pivotably supported on a pivot bracket 44. The pivot bracket 44 is fixed to the side of the mounting hole 33 by spot welding or the like as shown in FIG. In this state, the holding frame portion 41 faces the mounting hole 33. Further, torsion coil springs 45, 45 are provided between the pivot bracket 44 and the holding member 39, and give the holding member 39 elasticity in a direction approaching the outer peripheral surface of the cylindrical wall portion 30. . An engagement groove 46 is formed in a portion of the outer end surface 40 of the base 35 of the holding case 32 where the above-mentioned holding frame portion 41 faces, in which the holding frame portion 41 is engaged without play. In a state where the outer end surface 40 is held down by the holding frame 41, the holding case 32 is positioned by the engagement between the holding frame 41 and the engagement groove 46.

  In the case of the rolling bearing unit with the rotation speed detecting device as described above, the wheel fixed to the flange 15 provided at the outer end of the hub 14 can be rotatably supported by the suspension device supporting the outer wheel 2a. Further, when the tone wheel 6a rotates together with the inner ring 1a externally fitted and fixed to the inner end portion of the hub 14 with the rotation of the wheel, the tone wheel 6a is embedded in the insertion portion 34 constituting the holding case 32, and the tone wheel 6a is The output of the sensor that faces the inner surface of the tone wheel main body 21 that is configured changes. Since the frequency at which the output of the sensor changes is proportional to the rotation speed of the wheel, if the output signal of the sensor is input to a controller (not shown) via the harness 31, the rotation speed of the wheel is obtained, and ABS and TCS are calculated. Can be properly controlled.

  In the case of the rolling bearing unit with the rotation speed detecting device of the present invention configured as described above, the function of rotatably supporting the wheel and the function of detecting the rotation speed of the wheel are based on the conventionally known rotation speed detection. It is the same as a rolling bearing unit with a device. In particular, in the case of the rolling bearing unit with the rotation speed detecting device of the present invention, the cover 24 in which the holding case 32 in which the sensor is embedded and fixed is fixed to the outer ring 2a is used without using a special jig or the like. Can be easily attached and detached.

  That is, when attaching the holding case 32 to the outer race 2 a, the insertion portion 34 of the holding case 32 is inserted into the cover 24 through the attachment hole 33 formed in the cylindrical wall portion 30. At this time, the holding member 39 is retracted to the side from the opening of the mounting hole 33 against the elasticity of the torsion coil spring 45. If the insertion portion 34 is inserted into the mounting hole 33 and the sensor embedded and held in the insertion portion 34 is opposed to the inner side surface of the tone wheel main body 21 constituting the tone wheel 6a, The outer end surface 40 of the base 35 of the holding case 32 is pressed by the holding frame 41 of the holding member 39 that has been retracted to the side. At this time, the holding frame 41 and the engaging groove 46 are engaged.

  By these operations, the holding case 32 is supported on the cover 24 in a predetermined positional relationship without play. Further, the O-ring 38 is elastically sandwiched between the base 35 and the outer peripheral surface of the cylindrical wall 30 to seal a gap between the holding case 32 and the mounting hole 33, Through the cover 24 to prevent foreign matter such as rainwater from entering the cover 24. Further, the gap between the inner peripheral edge of the cover 24 and the outer peripheral surface of the constant velocity joint 16 is closed by the seal lip 27, so that no foreign matter enters the cover 24 through this gap.

  Further, if the holding member 39 is swung against the elasticity of the torsion coil spring 45 and the holding frame 41 is retracted from the opening of the mounting hole 33, the holding case 32 is moved to the mounting hole 33. It can be freely extracted from. Therefore, when the sensor breaks down, repair and replacement work of the sensor can be easily performed.

  Next, FIGS. 5 and 6 show a second embodiment of the present invention. In this embodiment, the present invention is applied to a rolling bearing unit for supporting non-drive wheels (a front wheel of an FR vehicle and a rear wheel of an FF vehicle) on a suspension device. A flange 15 for fixing the wheel is provided on the outer peripheral surface (left end in FIG. 5) of the hub 14a which is a rotating wheel, and a rotating side is provided at an intermediate portion of the outer peripheral surface of the hub 14a which is a rotating peripheral surface. An inner raceway 3a as a raceway surface is formed. Further, an inner ring 1a having an inner raceway 3b, which is also a rotating raceway surface, is fitted on an inner end portion (right end portion in FIG. 1) of the outer circumferential surface of the hub 14a. It is fixed. Then, a nut 48 is screwed onto a male screw portion 47 formed at the inner end of the hub 14a to hold down the inner ring 1a.

  The outer ring 2a, which is a fixed wheel, has a mounting portion 19 for supporting a knuckle of a suspension device (not shown) on an outer peripheral surface, and double-row outer raceways 4a, 4b on an inner peripheral surface, which is a fixed side peripheral surface, respectively. Has formed. A plurality of rolling elements 5, 5 are provided between the outer raceways 4a, 4b, which are the fixed raceway surfaces, and the inner raceways 3a, 3b, respectively. The hub 14a is rotatably supported inside the outer ring 2a. As in the first embodiment described above, tapered rollers may be used as the rolling elements 5 and 5 instead of balls.

  Further, a tone wheel 6b is externally fixed to a portion of the inner end of the inner ring 1a which is separated from the inner ring raceway 3b. The tone wheel 6b is made of a light-shielding plate material such as a thin metal plate and has an L-shaped cross section and is formed in an annular shape as a whole. And a flange 50 bent at a right angle. In such a tone wheel 6b, the cylindrical portion 49 is fixed to the inner ring 1a by fitting the cylindrical portion 49 to the inner end of the inner ring 1a. In the flange portion 50, a large number of through holes 51, 51 each having a slit shape, are formed at regular intervals in the circumferential direction. The optical characteristics of the flange portion 50 change alternately and at regular intervals in the circumferential direction due to the large number of through holes 51.

  A cover 24a is externally fitted and fixed to the open end of the outer ring 2a. The cover 24a is formed by subjecting a metal plate such as a steel plate, a stainless steel plate, and an aluminum alloy plate to plastic working such as drawing. A fitting portion 25 for externally fixing the cover 24a to the opening end of the outer ring 2a is provided on the periphery of the opening of the cover 24a, and interference with the nut 47 and the tone wheel 6b is provided at the center. A bulging portion 52 for prevention is formed. Further, a circular mounting hole 33a is formed in a part of the cylindrical wall portion 53 constituting the outer peripheral wall of the bulging portion 52 by burring. Therefore, a cylindrical wall 54 projecting from the outer peripheral surface of the cylindrical wall 53 is provided at the peripheral edge of the mounting hole 33a.

  Inside the mounting hole 33a, a holding case 32a made of a synthetic resin, in which a sensor and an end of a harness 31 for extracting an output signal of the sensor are embedded and mounted, is mounted. The holding case 32a inserts the cylindrical wall 54 formed on the peripheral edge of the mounting hole 33a from the outer diameter side to the inner diameter side of the cylindrical wall portion 53 (from top to bottom in FIG. 5) without looseness. And a base 35a having a larger diameter than the insertion portion 34a. In the illustrated embodiment, a flat surface 55 is formed on a part of the outer peripheral surface of the base 35a. When the insertion portion 34a is inserted into the inside of the cylindrical wall 54, when the flat surface 55 is aligned with a step portion 56 that connects the fitting portion 25 of the cover 24a and the bulging portion 52. The insertion portion 34a can be inserted into the inside of the mounting hole 33a only. When the insertion portion 34a is inserted to the inside of the mounting hole 33a in this manner, the holding case 32a is prevented from rotating based on the engagement between the flat surface 55 and the step portion 56. I have.

  A cylindrical concave portion 57 is formed on the inner end surface (lower end surface in FIG. 5) 36a of the base 35a. A locking groove 37a is formed on the inner diameter side surface of the concave portion 57 over the entire circumference. Then, an O-ring 38 is mounted in the locking groove 37a. When the insertion portion 34a is inserted into the mounting hole 33a until the inner end surface 36a abuts on the outer peripheral surface of the cylindrical wall portion 53, the outer peripheral edge of the O-ring 38 is elastically attached to the inner peripheral surface of the cylindrical wall 54. To tightly close the gap between the holding case 32a and the mounting hole 33a.

  In the present embodiment, the sensor embedded and held in the insertion portion 34a is a photoelectric sensor including a light emitting element and a light receiving element. For this reason, the distal end portion of the insertion portion 34a is formed in two branches, and the light emitting element is embedded in one side and the light receiving element is embedded in the other side so as to face each other. The harness 31 includes a power supply wiring for energizing the light emitting element and a signal wiring for extracting a signal of the light receiving element. Therefore, also in the case of the present embodiment, if the signal extracted through the harness 31 is sent to the controller, the rotation speed of the wheel can be obtained, and the ABS and TCS can be appropriately controlled.

  Further, also in the case of the present embodiment, an engagement groove 46a is formed in the outer end surface (upper end surface in FIG. 5) 40a of the base 35a, and the holding frame 41 of the holding member 39 is engaged with the engagement groove 46a. It is free. The structure and operation of the portion that presses the base 35a to the outer peripheral surface of the cylindrical wall portion 53 of the cover 24a by the pressing member 39 are the same as those in the first embodiment. Therefore, also in the case of the present embodiment, as in the case of the above-described first embodiment, the operation of attaching and detaching the sensor to and from the outer ring 2a as the fixed wheel can be easily performed.

FIG. 1 is a cross-sectional view illustrating a first embodiment of the present invention. FIG. 3 is a perspective view of a cover to which a holding member is attached. The expansion perspective view of a holding member. FIG. 3 is a perspective view of a holding case holding the sensor. Sectional drawing which shows Example 2 of this invention. FIG. 3 is a perspective view of a holding case holding the sensor. FIG. 7 is a partial cross-sectional view showing one example of a conventional structure.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1, 1a Inner ring 2, 2a Outer ring 3, 3a, 3b Inner ring track 4, 4a, 4b Outer ring track 5 Rolling element 6, 6a, 6b Tone wheel 7 Seal ring 8 Retaining ring 9 Locking projection 10 Through hole 11 Locking recess 12 Sensor 13 Gap 14, 14a Hub 15 Flange 16 Constant velocity joint 17 Stepped portion 18 Spline hole 19 Mounting portion 20 Support ring 21 Tone wheel main body 22 Cylindrical portion 23 Ring portion 24, 24a Cover 25 Fitting portion 26 Circular hole 27 Seal lip 28 Intermediate part 29 Sensor mounting part 30 Cylindrical wall part 31 Harness 32, 32a Holding case 33, 33a Mounting hole 34, 34a Insertion part 35, 35a Base 36, 36a Inner end face 37, 37a Locking groove 38 O-ring 39 Suppression member 40, 40a Outer end face 41 Holding frame part 42 Pivot part 43 Connecting part 44 Pivot bracket DOO 45 torsion coil spring 46,46a engagement groove 47 externally threaded portion 48 nut 49 cylindrical portion 50 a flange portion 51 through hole 52 bulging portion 53 cylindrical wall portion 54 cylindrical wall 55 flat surface 56 step portion 57 recess

Claims (1)

A fixed wheel having a fixed raceway surface on the fixed peripheral surface and not rotating when used; a rotating wheel having a rotating raceway surface on the rotating peripheral surface and rotating during use; the fixed raceway surface and the rotating raceway surface A plurality of rolling elements provided therebetween, and a flange surface which is formed in an annular shape as a whole, and is present in a direction perpendicular to the axis of the rotating wheel while being supported by the rotating wheel, A tone wheel in which the characteristics of the flange surface are alternately changed at equal intervals in the circumferential direction; a cover fixed to an end of the fixed wheel to close an end opening of the fixed wheel; And a sensor facing the flange surface of the tone wheel in a state supported by the rolling bearing unit with a rotation speed detecting device, wherein a cylindrical wall present on a part of the cover and diametrically outside the tone wheel. The inner part of the cylindrical wall and the outer part A mounting case for holding the sensor; an insertion portion for inserting the mounting hole from an outer diameter side to an inner diameter side of the cylindrical wall portion; and a cylindrical wall portion. A base that is abutted against the peripheral portion of the mounting hole on the outer peripheral surface of the mounting hole, and the base portion faces the outer peripheral surface of the cylindrical wall portion in a state where the insertion portion is inserted into the mounting hole, and the holding case and A gap between the mounting hole and the mounting hole is sealed by a sealing member, and at a position near the mounting hole on the outer peripheral surface of the cylindrical wall, the base of the holding case is pressed toward the outer peripheral surface of the cylindrical wall. A rotation speed detecting device, wherein a base end of the holding member is pivotally attached, and a tip end of the holding member elastically presses the base of the holding case toward the outer peripheral surface of the cylindrical wall. Rolling bearing unit.

Images