JP2009036233A - Bearing with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To support a resin sensor holder for supporting a sensor to prevent the sensor holder from easily dropping from a diameter face of a stationary side bearing ring without using a core bar. <P>SOLUTION: The sensor holder 40 is an annular integrated injection-molded article comprising thermosetting resin. A screw part 41a is formed on the outer diameter face of the sensor holder 40, and a screw part 11b and a screwing end part 11c having a diameter different from that of the screw part 11b are formed on the inner diameter face of the stationary side bearing ring 11. The screw part 41a of the sensor holder 40 is screwed to the screw part 11b of the stationary side bearing ring 11 from one lateral side, and the sensor holder 40 is made abut on and fastened to the screwing end part 11c, so as to fix the sensor holder 40 to the stationary side bearing ring 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sensor-equipped bearing including a rolling bearing and sensors for detecting rotation, detecting rotation speed, detecting rotation direction, detecting temperature, detecting vibration, and the like.

  As a typical example of this type of rolling bearing, there is a bearing with a rotation sensor that is used for a motor shaft, rotation speed control, rotation direction control, rotation angle control, etc. of an automobile axle (for example, Patent Document 1).

In a conventional bearing with a rotation sensor, one bearing ring constituting a rolling bearing is a stationary bearing ring that is fitted to a stationary member such as a motor housing or an automobile suspension, and the other bearing ring is rotated. The rotating side race ring fitted to the shaft side is supported, and the sensor is supported on the radial surface of the stationary side race ring among the sensors and pulse rings constituting the rotary encoder so that the pulse ring rotates integrally with the rotary side race ring. It has become something that was supported.
The rotary encoder is generally a magnetic encoder rather than an optical encoder because the lubricant is inside the bearing.

The sensor is held by an annular sensor holder made of resin, and the sensor holder is fitted and fixed to an annular cored bar, and a gap between the sensor and the metal raceway ring and the cored bar is a meat part of the sensor holder. In some cases, it is insulated by adding a resin mold. The sensor held by the sensor holder is supported on the stationary side race ring by press-fitting an annular cored bar from one side to the radial surface of the stationary side race ring.
When a resin sensor holder is press-fitted and fitted to the stationary race, the loose fitting is caused by radial creep and easily falls off. The creep characteristics of the core metal are superior to the sensor holder made of resin. For this reason, it is possible to set the tightening margin between the cored bar and the stationary side raceway relatively tightly, and thereby the sensor holder can be firmly supported by the stationary side raceway through the cored bar.

  A cover member having an inverted L-shaped cross section is fitted to the inner periphery of the core metal, and the sensor holder is located on the inner side surrounded by the core metal, the cover member, and the pulse ring, and is protected from the outside. ing. Since it is difficult to form a seal groove on the stationary side race ring and attach the seal thereto, the core metal, the cover member, the pulse ring, and the sensor holder are provided so as to form a labyrinth gap.

Japanese Patent Laying-Open No. 2005-249545 (FIG. 1, paragraphs 0013 and 0015 to 0018)

  However, the sensor-equipped bearing described in the above-mentioned Patent Document 1 requires assembly of two parts, an annular cored bar and a resin sensor holder, in order to support the sensor on the stationary side race. There is room for improvement in meeting the demand for cost reduction.

  Accordingly, an object of the present invention is to support a resin-made sensor holder that holds a sensor without using a cored bar so as not to easily fall off from the radial surface of the stationary-side raceway.

  In order to achieve the above object, the present invention is made of a resin-made resin in which a plurality of rolling elements are interposed between a stationary raceway and a rotary raceway, and a sensor is held on a radial surface of the stationary raceway. In a sensor-equipped bearing that supports a sensor holder, the sensor holder is an annular integrally formed product, a thread portion is formed on a radial surface of the stationary side race and the sensor holder, and the thread portion of the sensor holder is A characteristic configuration is adopted in which the sensor holder is fixed to the stationary side race ring by tightening by screwing into the threaded portion of the stationary side race ring from one side.

According to said characteristic structure, a sensor holder is fixed with the fastening force by screwing with respect to a stationary-side track ring. If it fixes by screwing, stronger fixation can be obtained compared with the case where it press-fits by cylindrical surfaces. Since the sensor holder is screwed onto the stationary side race ring, there is no risk of loosening due to shaft rotation. Even if the screwing is loosened due to creep, the sensor holder is screwed into the stationary raceway, so it cannot be displaced immediately in the axial direction as in the case of press-fitting and does not fall off easily. .
Therefore, according to the present invention, the resin sensor holder that holds the sensor can be supported so as not to easily fall off the radial surface of the stationary raceway without using a cored bar.

  Here, it is preferable to employ a configuration in which the detection direction of the sensor is a radial direction. The sensor holder creep is mainly generated in the screw shaft direction due to fixing by screwing, and is smaller in the radial direction than in the case of press-fitting. Therefore, if the detection direction of the sensor is the radial direction, the creep of the sensor holder hardly affects the detection of the sensor.

The resin used for molding the sensor holder can be appropriately selected so as to satisfy desired mechanical strength, insulation, creep characteristics, and the like.
Here, the thermosetting resin is superior in mechanical strength with respect to temperature rise as compared with the thermoplastic resin. For this reason, if the sensor holder employs a configuration made of a thermosetting resin, creep of the sensor holder is reduced, and more stable support can be obtained.

If a configuration is adopted in which a screwed end that the sensor holder abuts in the screw axis direction is formed on the radial surface of the stationary side race ring, the sensor holder abuts the screwed end, so the head of the sensor holder Even if it is not, the screwing position can be determined.
Therefore, according to this configuration, the head is not required as compared with the configuration in which the head is formed on the sensor holder and the head and the side surface on one side of the stationary side raceway are butted. Can be made compact.

  Here, by utilizing the fact that the head is not necessary, if the configuration in which the sensor holder has no portion facing the side surface on one side of the stationary side raceway is employed, the stationary side A member for positioning the bearing ring in the axial direction with respect to the stationary member, such as a bearing box cover, a spacer, a spacer, etc., is easily obtained by abutting against one side surface of the stationary bearing ring. be able to.

In the above characteristic configuration, the sensor holder has a flange portion that extends toward the rotation side raceway, and a configuration in which a seal portion that forms a labyrinth gap with the flange portion is provided on the rotation side raceway is adopted. can do.
According to this structure, a collar part becomes a substitute of the cover member of the said prior art example, and can reduce the number of assembly parts of a bearing with a sensor more.

In the case of adopting the configuration related to the flange portion, a sensor insertion portion for sealing the sensor is formed in a portion of the sensor holder that is inside the outlet of the labyrinth gap, and the sensor insertion portion includes the sensor It is preferable to adopt a configuration in which a line port for taking out the wiring is opened and the line port is closed with a sealant.
If the sensor holder that seals the sensor is formed in a part of the sensor holder that is inside the outlet of the labyrinth gap, the sensor is located in a portion protected from the outside by the labyrinth gap. And foreign objects are hard to reach.
Even if the sensor is positioned at such a position, the wiring connected to the sensor can be taken out from the line port communicating with the sensor insertion portion.
Since the line opening is blocked by the sealant that seals the sensor in the sensor insertion portion, it is also possible to prevent water and foreign matter from reaching the sensor through the line opening.
Therefore, if this configuration is adopted, the sensor can be protected from the outside.

  When the mechanical strength is prioritized, the sealant preferably employs a thermosetting resin such as an epoxy resin or a urethane resin, and when prioritizing protection of the sensor from vibration, the sealant has vibration absorption. It is preferable to employ a filler such as a silicone resin or silicone rubber. Of course, a sealing agent having insulating properties and waterproof properties is preferable.

  When a pulse ring that constitutes a rotary encoder together with the sensor is provided in the rotation side raceway ring, a thread portion is formed on the pulse ring and a radial surface of the rotation side raceway ring, and the screw portion of the pulse ring is disposed on the rotation side. It is possible to adopt a configuration in which the pulse ring is fixed to the rotating side raceway by tightening by screwing into the threaded portion of the raceway from one side.

The pulse ring is not limited to the one made of resin, and may be made of metal or resin-molded on a cored bar.
The rotary encoder is a device that generates an output signal in accordance with the rotation angle when the rotation-side raceway rotates integrally with the shaft. The rotary encoder may be either an incremental type or an absolute type, and an appropriate detection type such as an optical type or a magnetic type can be adopted.

  If the pulse ring is fixed to the rotating raceway by screwing, the pulse ring cannot be immediately displaced in the axial direction as in the case of press fitting because the pulse ring is screwed to the rotating raceway. Easy to drop off.

  Since the pulse ring is screwed to the rotation-side raceway, it is preferable to employ a locking means when the rotation-side raceway is mounted on a rotation shaft that rotates in a direction in which the screwing is loosened. As a simple locking means, an adhesive can be applied to the threaded portion.

If a configuration is adopted in which the screw ring end against which the pulse ring abuts in the screw axis direction is formed on the radial surface of the rotation side raceway, the head of the pulse ring is placed on the rotation side raceway as in the case of the sensor holder. The pulse ring can be made compact as compared with the case of a configuration that abuts against the side surface on one side.
Of course, it is possible to adopt a configuration in which the pulse ring does not have a portion facing the side surface on one side of the rotation side raceway.

When the screwed end portion is employed, the screwed end portion is formed by providing a diameter difference over the entire circumference with respect to the threaded portion of the bearing ring forming the screwed end portion. It is preferable to employ a configuration in which the portion and the threaded portion of the race are connected via a corner corner.
If the screw end is formed by providing a diameter difference over the entire circumference on the radial surface of the race, the screw end can be easily formed by turning the race. Even if the screwed end is formed over the entire circumference, there is a corner dimple between the screwed part and interference between the screwing tool and the screwed end is prevented, making screwing easy. Become.
In addition, the sensor holder and the pulse ring can be reliably screwed to the screwed end.

  As described above, according to the present invention, by adopting the above-described characteristic configuration, the resin sensor holder that holds the sensor is not easily dropped from the radial surface of the stationary side race ring without using a cored bar. Can be supported.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
FIG. 1a shows the overall configuration of the sensor-equipped bearing according to the embodiment by an AA cutting line in FIG. 1b, and FIG. 1b shows the appearance of the sensor-equipped bearing according to the embodiment from one side.

  As shown in FIGS. 1A and 1B, the sensor-equipped bearing according to the embodiment includes a plurality of rolling elements 13 interposed between the stationary-side raceway ring 11 and the rotation-side raceway ring 12, and each rolling element 13 is held in a cage 14. It is provided with a rolling bearing held in

  The stationary ring 11 is an outer ring and is fitted to the stationary member 20 side. A resin sensor holder 40 that holds the sensor 30 is supported on an end portion on one side of the inner diameter surface of the stationary-side race 11.

  The rotation-side race 12 is an inner ring and is fitted to a rotation shaft side (not shown). A pulse ring 50 that constitutes a rotary encoder together with the sensor 30 is supported on an end portion on one side of the outer diameter surface of the rotation side raceway ring 12.

  This rolling bearing is used for grease lubrication. Grease (not shown) between the stationary-side raceway ring 11 and the rotation-side raceway ring 12 is sealed with a labyrinth gap 60 formed by the sensor holder 40 and the pulse ring 50 on one side of the raceway. On the other side, it is sealed with a seal 15 attached to the seal groove of the stationary race 11.

FIG. 2 shows that the sensor 30, the sensor holder 40, and the pulse ring 50 are removed from each mounting symmetrical part, and a part of the sensor holder 40 and the pulse ring 50 in the circumferential direction is partially broken so that the cut surface in FIG. This is shown in a state where
FIG. 3a shows an enlarged view of the sensor portion of FIG. 1a, and FIG. 3b shows the sensor portion with a BB cut line in FIG. 3a.

  The sensor 30 and the pulse ring 50 shown in FIGS. 2 and 3 constitute a magnetic encoder that is a kind of rotary encoder.

  The sensor 30 has a magnetic sensor 32 mounted on a substrate 31 and a wiring 33 of the magnetic sensor 32 connected to the substrate 31. This sensor 30 is a two-phase output method of A phase and B phase, and the electrical phase difference between the A phase output signal and the B phase output signal is 90 degrees.

  As the magnetic sensor 32, for example, a Hall element that detects a magnetic field and outputs an analog signal based on the detected magnetic field, a Hall element and an analog-digital signal conversion circuit are packaged in one package, and a digital signal based on the detected magnetic field Output Hall IC, linear Hall IC in which Hall element and amplifier circuit are packaged in one package, MR element in which resistance value changes due to magnetic field due to magnetoresistance effect, MR element and analog-digital signal conversion circuit in one package And an MR-IC that outputs a digital signal based on the detected resistance value.

  The pulse ring 50 has a multipolar magnetized magnet in which N poles and S poles are alternately magnetized in the circumferential direction on the outer diameter surface, N poles on the outer periphery of the outer surface, and S poles on the remaining half periphery. Single pole magnetized magnets can be used.

  For the pulse ring 50, for example, a gear made of a magnetic material, or a disk made of a magnetic material with a window removed to generate a pulse can be used.

  The pulse ring 50 includes an annular cored bar 51 and a magnetized magnet 52 integrated on one end of the outer diameter surface of the cored bar 51.

  The core metal 51 is made of a magnetic material. For this reason, the cored bar 51 functions as a magnetic shield that surrounds the outer diameter portion of the multipolar magnetized magnet 52 in the radial direction.

  The core metal 51 is a press-formed product of a plate material. The plate material of the core metal 51 may be a magnetic material, and for example, an SPCC material can be used.

  As the multipolar magnet 52, a magnetic material obtained by kneading magnetic powder in rubber and a cored bar 51 is vulcanized and bonded with a vulcanization mold.

  Note that heat-resistant nitrile rubber (HNBR), nitrile rubber (NBR), fluorine rubber (FKM), acrylic rubber (ACM), silicone rubber (VMQ), or the like can be used as the rubber as necessary.

  As the magnetic powder, ferrite, rare earth, alnico, and the like can be used as required. It is desirable to use rare earth (neodymium, samarium) or alnico. Since these rare earth-based or alnico-based magnetic materials have a stronger magnetic force than conventional ferrite-based magnetic materials, they are less susceptible to the leakage magnetic field generated from the motor or the like when incorporated in a motor or the like, and the sensor 30 malfunctions. Can be avoided.

When using rare earth magnetic powder or alnico magnetic powder, the multipolar magnetized magnet 52 can be a sintered ring.
The multipolar magnetized magnet 52 can be a plastic magnet ring formed by injection molding.
When the multipolar magnetized magnet 52 is a sintered ring or a plastic magnet ring, the multipolar magnetized magnet 52 is fixed to the core metal 51 by press-fitting to the core metal 51 or by an adhesive. Can do.

  The detection direction of the sensor 30 is the radial direction, and faces the pulse ring 50 in the radial direction. More specifically, the magnetic sensor 32 which is a detection part of the sensor 30 is a non-contact type, and is opposed to the multipolar magnetized magnet 52 with a gap in the radial direction.

  The sensor holder 40 that holds the sensor 30 is an annular integrally molded product.

  The sensor holder 40 is made of a thermosetting resin and is injection-molded.

  In addition, the sensor holder 40 can also be comprised from another resin, a polymer alloy, and a fiber reinforced plastic. For example, the sensor holder 40 is made of polyamide (PA), nylon, polyacetal (POM), polycarbonate (PC), modified polyphenylene ether (m-PPE, modified PPE), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene. With terephthalate and glass resin (PET-G), glass fiber reinforced polyethylene terephthalate (GF-PET), cyclic polyolefin (COP), polyphenylene sulfide (PPS), polysulfone (PSF), polyethersulfone (PES), amorphous poly Can be molded using arylate (PAR), liquid crystal polymer (LCP), polyetheretherketone (PEEK), thermoplastic polyimide (PI), polyamideimide (PAI), etc. .

  The sensor holder 40 includes a screw shaft portion 41 that is concentric with the stationary side raceway ring 11 and a flange 42 that extends toward the rotation side raceway ring 12.

  The screw shaft portion 41 has a cylindrical shape through which the rotation shaft can pass, and a screw portion 41a is formed at the end portion on the other side of the outer diameter surface.

On the other hand, a threaded portion 11b is formed on the inner diameter surface of the stationary side race 11 from the inner peripheral edge of the side surface 11a on one side toward the width center side.
The screw shaft direction is set to coincide with the axial direction. This is for facilitating support and fixation as a parallel threaded engagement with the stationary-side track ring 11.

The screw shaft portion 41 is extended to one side from the screw portion 41a, and rotational torque can be applied to the extended portion. Thereby, the screw part 41a of the sensor holder 40 can be screwed into the screw part 11b of the stationary side ring 11 from one side.
The flange portion 42 is extended from the one side end portion of the extended portion of the screw shaft portion 41 toward the rotation side race 12. The strength against the application of rotational torque to the screw shaft portion 41 is enhanced by the formation of the flange portion 42.

  On the inner diameter surface of the stationary side race ring 11, a screwing end portion 11c is formed so that the sensor holder 40 abuts in the screw shaft direction. The screwing end portion 11c is formed by providing a difference in diameter over the entire circumference with respect to the screw portion 11b on the inner diameter surface of the stationary side race 11. The screwing end portion 11c is formed by turning an end portion on one side of the inner diameter surface to a larger diameter than the one side edge of the track.

The screwing end portion 11c and the screw portion 11b are connected via a corner dimple 11d. The opening width in the screw shaft direction of the corner shank 11d has a length of one pitch or more of the screw portion 11b, and the radial depth thereof is deeper than the valley diameter, and the tool for threading the screw portion 11b. Can be sent one extra pitch. Accordingly, interference between the tool and the screwing end portion 11c is prevented.
Further, the sensor holder 40 can be reliably screwed up to the screwed end portion 11c.

  The sensor holder 40 that advances by screwing comes into contact with the screwing end portion 11c of the stationary side race ring 11, and the screwing position is determined. In accordance with the application of the rotational torque from the state where the screwing position is determined, tightening by screwing of the screw parts 41a and 11b can be obtained. By this tightening, the sensor holder 40 is fixed in a state where it is supported on the inner diameter surface of the stationary side race 11.

Since the sensor holder 40 is fixed by tightening by screwing, the sensor holder 40 is firmly fixed in the axial direction as compared with the case where the inner surface of the stationary race 11 and the cylindrical surface are press-fitted together.
Further, since the sensor holder 40 is screwed to the stationary side race ring 11, there is no worry of loosening due to shaft rotation. Even if the screwing is loosened due to creep, the sensor holder 40 is screwed into the stationary race ring 11, and thus cannot be displaced immediately in the axial direction as in the case of press-fitting fitting. Do not fall off.
Therefore, the sensor-equipped bearing according to this embodiment supports the resin-made sensor holder 40 that holds the sensor 30 so that the resin-made sensor holder 40 does not easily fall off from the inner diameter surface of the stationary side race 11 without using a cored bar. Can be made.

  The sensor holder 40 is fixed to the stationary side race ring 11 and does not have a portion facing the side surfaces 11a and 12a on one side of the stationary side race ring 11 and the rotation side race ring 12 in the axial direction. ing. Therefore, the member for positioning in the axial direction of the raceway can be abutted against the side surfaces 11a, 12a on one side of the stationary raceway 11 and the rotation side raceway 12 without any trouble.

  On the other hand, the same screwing structure as that of the sensor holder 40 is also used for fixing the pulse ring 50 to the rotation-side raceway ring 12.

  That is, a threaded portion 51 a is formed at the end portion on the other side of the inner diameter surface of the cored bar 51. In the formation of the threaded portion 51a on the cored bar 51, if it is rolled simultaneously with the press molding of the cored bar 51, the manufacturing process can be simplified compared with the case of post-processing.

On the other hand, a threaded portion 12b is formed at an end portion on one side of the inner diameter surface of the rotating side race 12 from the outer peripheral edge of the side surface 12a on the one side side toward the width center side.
The screw shaft direction is set to coincide with the axial direction. This is for facilitating support and fixation as a parallel threaded engagement with the rotation side raceway ring 12.

  The cored bar 51 is extended to one side from the screw part 51a, and rotational torque can be applied to the extended part. Thereby, the screw part 51a of the pulse ring 50 can be screwed to the screw part 12b of the rotation side race 12 from one side. In addition, the extension part of the cored bar 51 is bent to the outer diameter side between the screw part 51a, and thereby the strength of the cored bar 51 with respect to the application of rotational torque is increased. The magnetized magnet 52 is integrated on the outer diameter surface of the extended portion, and deformation associated with the application of rotational torque is prevented.

  A screwing end 12c is formed on the outer diameter surface of the rotation-side race 12 so that the pulse ring 50 abuts in the screw axis direction. The screwing end portion 12c is formed by providing a diameter difference over the entire circumference with respect to the screw portion 51b on the outer diameter surface of the rotating raceway ring 12. The screwing end portion 12c is formed by turning an end portion on one side of the outer diameter surface to a smaller diameter than the edge on one side of the track.

The screwing end portion 12c and the screw portion 12b are connected via a corner corner 12d. The opening width in the screw shaft direction of the corner thinning 12d has a length of one pitch or more of the screw portion 12b, and the radial direction depth is deeper than the valley diameter, and the tool for threading the screw portion 12b. Can be sent one extra pitch. Therefore, interference between the tool and the screwing end 12c is prevented.
Moreover, the pulse ring 50 can be reliably screwed to the screwed end portion 12c.

  The threaded pulse ring 50 abuts against the screwing end 12c of the rotating raceway ring 12, and the screwing position is determined. Tightening by screwing of the screw portions 51a and 12b can be obtained in accordance with the application of rotational torque from the state where the screwing position is determined. By this tightening, the pulse ring 50 is fixed in a state where it is supported on the outer diameter surface of the rotating raceway 12.

  If the sensor holder 40 and the pulse ring 50 are detachable as a secondary effect associated with the use of fixed support by screwing, the exchangeability of these can be easily realized.

  When priority is given to secure screwing of the sensor holder 40 and the pulse ring 50, an adhesive can be appropriately applied to the screw portions 11b, 12b, 41a, 51a to prevent loosening.

As the above-mentioned adhesive, if a material that can be bonded even if there is a small amount of oil on the surface of the adherend, the degreasing work of the bonding surfaces of the race rings 11 and 12 and the resin sensor holder 40 is omitted. be able to.
As this type of adhesive, for example, an adhesive mainly made of urethane methacrylate can be mentioned, and as a commercially available adhesive, for example, “Loctite 603” manufactured by Nippon Loctite Co., Ltd. can be mentioned.

  The pulse ring 50 is fixed to the rotation side raceway ring 12 and does not have a portion facing the side surface 12a on one side of the rotation side raceway ring 12 in the axial direction. Therefore, the member for positioning in the axial direction of the bearing ring can be abutted against the side surface 12a on one side of the rotation-side bearing ring 12 without trouble.

  The pulse ring 50 is fixed to the rotating raceway 12 before the sensor holder 40. Thereafter, when the sensor holder 40 is fixed to the stationary race ring 11, the outer diameter surface of the magnetized magnet 52 of the pulse ring 50 faces the inner diameter surface of the screw shaft portion 41 of the sensor holder 40 in the radial direction. One side end of the ring 50 faces the flange 42 of the sensor holder 40 in the axial direction, and the inner diameter surface of the extended portion of the core metal 51 of the pulse ring 50 is the same as the inner diameter end of the flange 42 of the sensor holder 40. It is designed to face the direction.

  The opposing space forms a series of narrow paths, which become the labyrinth gap 60. That is, in the sensor-equipped bearing according to this embodiment, the pulse ring 50 also serves as a seal portion that forms the labyrinth gap 60 together with the flange portion 42, thereby suppressing an increase in the number of components.

  The labyrinth gap 60 functions as a non-contact seal for suppressing grease leakage, and reduces the amount of leakage to the outside due to pressure loss caused by bending the narrow path.

  The labyrinth gap is formed by extending the other side end of the sensor holder 40 toward the inner diameter side and narrowing the space between the outer diameter surface of the rotating side race 12 and the outer diameter surface of the pulse ring 50. It is also possible.

A sensor insertion portion 43 that seals the sensor 30 is formed in a portion of the sensor holder 40 that is inside the outlet of the labyrinth gap 60. The sensor holder 43 is in a position where the sensor 30 held by sealing faces the magnetized magnet 52 of the pulse ring 50 in the radial direction.
Even if the sensor insertion portion 43 is formed at such a position, the sensor holder 40 is fixed by screwing, so that the sensor 30 can be held in the sensor holder 40 in advance.

FIG. 4 shows how the sensor 30 is held in the sensor insertion portion 43.
As shown in FIGS. 3 and 4, the sensor insertion portion 43 is a space for filling with a sealant. The inner wall surface of the sensor insertion portion 43 is formed to position the sensor 30 so as to face the detection direction within a range necessary for detection.

  The sensor slot 43 has an open line opening 44 through which the sensor 30 with the wiring 33 can be inserted from the outside. The line port 44 is closed with a sealant.

The line port 44 is open to one side of the sensor holder 40, and the wiring 33 can be taken out to one side.
Even when the stationary side race 11 creeps with respect to the inner periphery of the stationary member, if the wiring 33 is taken out from one side, the effect of rotation due to creep is more affected by the wiring 33 than when it is taken out in the radial direction. It becomes difficult to act, and disconnection can be prevented.

The line port 44 also serves as an insertion port for the sensor 30, and the sensor 30 can be inserted in a posture facing the detection direction.
The inner wall surface of the sensor insertion portion 43 guides the insertion of the sensor 30 in the detection direction while directing the insertion of the sensor 30 in the detection direction, so that the inserted sensor 30 hits the insertion direction and the insertion position is determined. This is to facilitate sealing of the sensor 30.

  Here, in a non-contact type sensor such as the magnetic sensor 32, it is preferable that there is no obstacle between the detection target. Further, it is preferable that the sealant that seals the sensor 30 does not protrude from the sensor insertion portion 43 in order to prevent a decrease in the road width of the labyrinth gap 60. Therefore, a sensor window 45 that opens in the detection direction of the sensor 30 is opened in the sensor insertion portion 43. The magnetic sensor 32 of the sensor 30 is sealed so as to be exposed from the sensor window 45.

  In addition, what is necessary is just to change suitably the structure which hold | maintains a sensor in the sensor holder 40 according to the kind of sensor. For example, in a non-contact sensor, the sensor holder 40 can be held by insert molding. When there is no problem in detection accuracy, it is not necessary to open the sensor insertion portion in the detection direction, and the sensor holder can be covered with a meat portion of the sensor holder or a sealing agent for protecting the sensor.

  In the above embodiment, the inner ring rotation type sensor-equipped bearing has been described. However, the present invention can be similarly applied to an outer ring rotation type bearing.

a is a sectional view showing a bearing with a sensor according to the embodiment by a cut surface of an axial plane, and b is a side view of the bearing with a sensor of a. 1 is an exploded perspective view of the sensor portion of the sensor-equipped bearing of FIG. a is an enlarged view of the sensor portion of FIG. 1a, and b is an enlarged view of a cut surface of line BB of a. 2 is a partial perspective view showing the sensor insertion portion of FIG. 2 from the inner diameter side, and b is a partial perspective view showing a state where the sensor is inserted into the sensor insertion portion from the state of a.

Explanation of symbols

11 Stationary-side track rings 11a, 12a Side surfaces 11b, 12b, 41a, 51a Threaded portions 11c, 12c Screwed ends 11d, 12d Corner corners 12 Rotating-side track rings 13 Rolling bodies 14 Cage 15 Seal 20 Stationary member 30 Sensor 31 Substrate 32 Magnetic sensor 33 Wiring 40 Sensor holder 41 Screw shaft portion 42 Hook portion 43 Sensor insertion portion 44 Line port 45 Sensor window 50 Pulse ring 51 Core metal 52 Magnetized magnet 60 Labyrinth gap

Claims (11)

In a sensor-equipped bearing in which a plurality of rolling elements are interposed between a stationary side raceway and a rotation side raceway, and a resin sensor holder that holds a sensor is supported on the radial surface of the stationary side raceway,
The sensor holder is an annular integrally formed product, a threaded portion is formed on the radial surface of the stationary side race ring and the sensor holder, and the threaded portion of the sensor holder is one side of the threaded portion of the stationary side race ring. A sensor-equipped bearing, wherein the sensor holder is fixed to the stationary-side raceway by tightening by screwing.   The sensor-equipped bearing according to claim 1, wherein a detection direction of the sensor is a radial direction.   The sensor-equipped bearing according to claim 1, wherein the sensor holder is made of a thermosetting resin.   The sensor-equipped bearing according to any one of claims 1 to 3, wherein a screwing end portion on which the sensor holder abuts in a screw shaft direction is formed on a radial surface of the stationary side race.   The sensor-equipped bearing according to claim 4, wherein the sensor holder has no portion facing a side surface on one side of the stationary side race.   6. The sensor holder according to claim 1, wherein the sensor holder includes a flange portion that extends toward the rotation-side raceway, and the rotation-side raceway is provided with a seal portion that forms a labyrinth gap together with the flange portion. Bearing with sensor.   In the sensor holder, a sensor insertion portion for sealing the sensor is formed in a portion inside the outlet of the labyrinth gap, and a line port for taking out the sensor wiring to the outside is opened in the sensor insertion portion, The sensor-equipped bearing according to claim 6, wherein the line port is closed with a sealant.   A pulse ring that constitutes a rotary encoder together with the sensor is provided in the rotation-side raceway, a screw portion that is screwed to the radial surface of the pulse ring and the rotation-side raceway is formed, and the screw portion of the pulse ring is The sensor-equipped bearing according to any one of claims 1 to 7, wherein the pulse ring is fixed to the rotating side raceway ring by tightening by screwing into a screw portion of the rotation side raceway ring from one side.   The bearing with a sensor according to claim 8, wherein a screwing end portion on which the pulse ring abuts in a screw shaft direction is formed on a radial surface of the rotating side raceway ring.   The sensor-equipped bearing according to claim 9, wherein the pulse ring has no portion facing a side surface on one side of the rotation side raceway ring.   The screwed end portion is formed by providing a diameter difference over the entire circumference with respect to the threaded portion of the bearing ring forming the screwed end portion, and the screwed end portion and the threaded portion of the bearing ring are formed. The sensor-equipped bearing according to claim 4 or 9, wherein the bearings are connected via corner corners.

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