JP2004263716A - Sensor assembly, sealing device and rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device mounted with a sealing device incorporating a rotation detector, allowing easy replacement of a harness when broken, improving its mountability on a vehicle and offering the compact rotation detector. <P>SOLUTION: The rolling bearing device has balls 5 mounted between raceway surfaces of inner and outer ring members 2, 3 and the sealing device 8 mounted between shoulder portions of the inner and outer ring members 2, 3. The sealing device 8 consists of an outer ring side seal ring fixed to the outer ring member 2 and an inner ring side seal ring fixed to the inner ring member 3. A pulser ring 16 is fixed to a circular core of the inner ring side seal ring, a normal/reverse detection sensor 15 is covered with a resin casing 17 and integrated therewith on the outer diameter side of the circular core of the outer ring side seal ring, and a connector 20 connected to the normal/reverse detection sensor 15 is continuously provided extending to the direction of the outer diameter of the resin casing 17. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention incorporates a sensor for a rotation detector and a pulsar ring used in an ABS (anti-lock brake system) of an automobile into a seal device called a so-called pack seal. The present invention relates to a rolling bearing device which seals a gap between the rolling bearing device and a sensor assembly and a sealing device constituting the rolling bearing device.
[0002]
[Prior art]
BACKGROUND ART Conventionally, there is a bearing device that rotatably supports an axle of an automobile with respect to a vehicle body and includes a rotation detector used for an ABS or the like (for example, see Patent Document 1).
[0003]
In the bearing device, a rolling element is interposed between each raceway surface of an inner ring which is externally fitted to an axle and serves as a rotating wheel and an outer ring which is fixed to a vehicle body and serves as a fixed wheel, and a gap between the inner and outer rings is sealed by a sealing device. Have been.
[0004]
The rotation detector detects a change in a magnetic field of a pulsar ring fixed to an inner wheel serving as a rotating wheel with a sensor, and the detection signal is transmitted to an electronic circuit of the vehicle body via a harness.
[0005]
[Patent Document 1]
JP-A-8-43411
[Problems to be solved by the invention]
Usually, the sensor is fixed to the knuckle, and the electronic circuit is provided on the vehicle body. For this reason, the knuckle is connected to the damper when the vehicle body shakes during traveling, so that the vibration of the vehicle body is not transmitted to the knuckle. Therefore, while the electronic circuit provided on the vehicle body vibrates due to the vibration of the vehicle body, the sensor fixed to the knuckle is not affected by the vibration of the vehicle body. For this reason, the harness connecting the sensor and the electronic circuit may be disconnected by vibration of the vehicle body.
[0007]
Further, a recent ABS sensor is incorporated in a seal device called a so-called pack seal mounted on a bearing device to save space.
[0008]
For this reason, when the harness of the sensor is broken and the ABS sensor becomes abnormal, it is necessary to replace the entire hub unit including the bearing device, and there is a problem that maintenance work is troublesome and costly. .
[0009]
[Means for Solving the Problems]
A sensor assembly according to the present invention, which is fixed to an outer ring member serving as a fixed ring and detects a rotation state of an inner ring member serving as a rotating ring, includes a metal ring body and a magnetic body fixed to the inner ring member. A magnetic sensor for detecting a ring, and a resin exterior body that covers the magnetic sensor and is integrated with the metal ring body, and the resin exterior body is press-fitted to the inner periphery of the outer ring member. A connector extending in the outer diameter direction and connected to the magnetic sensor is connected to the resin exterior body.
[0010]
The sealing device of the present invention includes an outer ring side seal ring fixed to an outer ring member serving as a fixed ring, and an inner ring side seal ring fixed to an inner ring member serving as a rotating ring. A magnetic sensor ring is fixed to the inner ring side seal ring, and a connector connected to the magnetic sensor is provided on the resin outer body so as to extend in an outer diameter direction and be connected to the magnetic sensor. The rotation state of the inner race member is detected by detecting the magnetic ring with a magnetic sensor.
[0011]
The rolling bearing device according to the present invention includes an inner ring member serving as a rotating ring having a raceway surface, an outer ring member arranged concentrically with the inner ring member and serving as a fixed wheel having a raceway surface corresponding to the inner ring member, and the inner ring member. And a rolling element interposed between the respective raceway surfaces of the outer ring member, and a sealing device for sealing a gap between the inner ring member and the outer ring member, wherein the sealing device is fixed to the outer ring member on an outer ring side. A seal ring, comprising an inner ring side seal ring fixed to the inner ring member, a magnetic sensor is integrated with the outer ring side seal ring covered with a resin outer body, and a magnetic ring is provided on the inner ring side seal ring. A connector that is fixed and extends in the outer diameter direction to the resin outer body and connected to the magnetic sensor is provided in series, and the magnetic sensor detects the magnetic ring and rotates the inner ring member. It is intended to detect the state.
[0012]
As the rotation detector, for example, an active type detector that changes the output according to a change in magnetic flux is used, and a pulsar ring is used for the magnetic ring, and two magnetic sensors that are spaced apart in the circumferential direction are used for the magnetic sensor. A configured forward / backward detection sensor is exemplified.
[0013]
According to the rolling bearing device of the present invention, the seal device is integrally formed with a rotation sensor composed of a magnetic sensor and a magnetic ring, and a connector connected to the magnetic sensor is provided on a resin outer casing for molding the magnetic sensor. The sealing device, the rotation detector, and the connector are integrated.
[0014]
A harness for connecting the magnetic sensor to the electronic circuit of the vehicle body has one end connected to the electronic circuit, and the other end having a detachable connector with respect to a connector integrally formed with the magnetic sensor. Is connected to a connector integrally formed with the magnetic sensor, whereby the magnetic sensor and the electronic circuit are connected. In this way, the harness is separated from the integrated body consisting of the sealing device, the rotation detector, and the connector, so that if the harness is broken due to the shaking of the vehicle during traveling, only the harness is easily removed from the connector and replaced. And maintenance can be performed cheaply and easily.
[0015]
By separating the harness from the integrated device including the seal device, the rotation detector, and the connector, the bearing device is fixed to the knuckle while the integrated device including the seal device, the rotation detector, and the connector is mounted on the bearing device. In this case, there is no harness that hinders the fixing work, and the mountability on the vehicle is improved.
[0016]
A magnetic sensor is provided on the outer ring side seal ring by molding with a resin outer package, and a magnetic ring is provided on the inner ring side seal ring. The magnetic sensor and the magnetic ring are integrated into the seal device. Thus, the rotation detector can be made compact.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0018]
FIG. 1 is a cross-sectional view showing the overall configuration of a rolling bearing device for a vehicle according to the present embodiment, FIG. 2 is an enlarged cross-sectional view of a main part of FIG. 1, FIG. FIGS. 5A and 5B are perspective views of the sealing device of FIG. 2, FIGS. 5A and 5B are diagrams showing a phase relationship between detection signals of two magnetic sensors, and FIG. FIG.
[0019]
The rolling bearing device 1 of the present embodiment is used on the driving wheel side of an automobile. In FIG. 1, the left side is a vehicle outer side and the right side is a vehicle inner side.
[0020]
Two rows of balls (an example of rolling elements) 4 and 5 arranged at equal positions in the circumferential direction on the crown-shaped cage 6 are respectively mounted on the outer ring member 2 which is supported non-rotatably on the vehicle body side via a knuckle 9. The inner ring member 3 is rotatably supported around the axis.
[0021]
A support flange 21 is formed on the outer peripheral surface of the outer ring member 2 so as to protrude outward in the radial direction. The support flange 21 is fixed to the knuckle 9 via the mounting bolt 10 so that the outer ring member 2 serves as a fixed ring. It is supported non-rotatably on the vehicle body.
[0022]
The inner race member 3 includes a hub wheel 31 and a tubular member 32 that is separate from the hub wheel 31 and is fitted to the vehicle inner side of the body of the hub wheel 31. A part of the outer peripheral surface of the body of the hub wheel 31 is used as an inner raceway surface of the balls 4 in the vehicle outer side row, and the outer peripheral surface of the tubular member 32 is used as an inner raceway surface of the balls 5 in the vehicle inner side row. On the inner peripheral surface of the outer race member 2, two outer raceway surfaces for the balls 4 and 5 in both rows are formed.
[0023]
The annular bearing space 11 between the outer ring member 2 and the inner ring member 3 is sealed on both sides in the axial direction to prevent the lubricant in the annular bearing space 11 from leaking to the outside. Sealing devices 7 and 8 for preventing entry are provided.
[0024]
A shaft 13 integrally formed with the bowl-shaped outer ring member 12 of the constant velocity joint (CVJ) is inserted into a center hole of the hub wheel 31 via a spline, and a nut 14 is attached to a vehicle outer side end of the shaft 13. The nut 14 is screwed and tightened against the end face of the concave portion 33 of the hub wheel 31 to apply necessary preload to the balls 4 and 5 in both rows, and the inner ring member 3 It is in a state of being integrated with the rotation.
[0025]
A hub flange 34 protruding radially outward is formed integrally on the outer peripheral surface of the hub wheel 31. A brake disc rotor and a tire wheel are mounted on the hub flange 34, and wheels are mounted on the tire wheel.
[0026]
The sealing device 7 on the outer side of the vehicle is, for example, formed by bonding a rubber lip slidingly contacting the hub wheel 31 to an annular core fitted inside the outer ring member 2.
[0027]
The seal device 8 on the vehicle inner side is configured by combining an outer ring-side seal ring 81 and an inner ring-side seal ring 82 that serve as a sensor assembly.
[0028]
The outer ring side seal ring 81 is attached to the outer ring member 2 side, and has a configuration in which a main lip 84 and an auxiliary lip 85 are attached to an annular core bar 83 which is a metal ring. The annular core bar 83 has a cylindrical portion 83a extending in the axial direction, and an annular plate portion 83b formed by bending the inner end side of the cylindrical portion 83a in the radial direction inward.
[0029]
The inner ring side seal ring 82 is attached to the cylindrical member 32 side, and has a configuration in which an axial lip 87 and a radial lip 88 are attached to an annular core bar 86. The annular cored bar 86 has a cylindrical portion 86a extending in the axial direction, and an annular plate portion 86b formed by bending the axially outer end side of the cylindrical portion 86a radially outward.
[0030]
Each lip 84, 85, 87, 88 is made of rubber such as nitrile butadiene rubber (NBR) and is vulcanized and bonded to the annular cores 83, 86. The annular core 83 of the outer ring side seal ring 81 is formed of a non-magnetic material such as non-magnetic stainless steel.
[0031]
The forward / reverse detection sensor 15 serving as a magnetic sensor is incorporated in the outer ring side seal ring 81, and the pulsar ring 16 serving as a magnetic ring is incorporated in the inner ring side seal ring 82, respectively. The rotation of the tubular member 32 is detected with the pulsar ring 16.
[0032]
The forward / reverse detection sensor 15 is composed of, for example, two magnetic sensors, such as a Hall element and a magnetoresistive element, which are arranged at a distance from each other in the circumferential direction, and is a sensor capable of detecting the rotation direction in addition to the rotation angle. As shown in FIG. 5, the phase relationship between the detection signals of the two magnetic sensors is such that when one of the magnetic sensors outputs the rectangular wave signal of FIG. 5A, the other magnetic sensor is 90 degrees out of phase. It is arranged to output a 5 (B) rectangular wave signal. The rotation direction of the inner ring 3 can be determined by the advance or delay of the phase of the detection signals of the two magnetic sensors.
[0033]
As the forward / reverse detection sensor 15, as shown in FIG. 6, a Hall IC incorporating two Hall elements 22 may be used. That is, the rotation direction can be detected by arranging the two Hall elements 22 at an interval (λ / 4) at which the output phase of each of them becomes 90 degrees with respect to the magnetization pitch λ of the pulsar ring 16. Here, the magnetization pitch λ is the total length of the magnetization of the N pole and the S pole.
[0034]
The forward / reverse detection sensor 15 is mounted on the outer peripheral surface of the cylindrical portion 83a of the annular core 83 of the outer ring side seal ring 81 in a non-contact manner, and has a thickness covering the forward / reverse detection sensor 15 on the outer diameter of the cylindrical portion 83a. It is provided by integrally molding (insert molding) the resin exterior body 17. The resin outer casing 17 is an engineering plastic such as polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), or polyamide (PA).
[0035]
A connector 20 to which a harness (not shown) connected to an electronic circuit of the vehicle body is connected to the resin outer case 17 is formed so as to extend in the outer diameter direction and be integrally formed. That is, the connector 20 is also formed of an engineering plastic such as PPS, PBT, or PA. A pin 19 is provided in the connector 20, and the forward / reverse detection sensor 15 and the pin 19 are connected by a signal line 18.
[0036]
FIGS. 4A and 4B are perspective views of a sealing device in which the connector 20 is integrally formed. FIG. 4A is a diagram of the sealing device as viewed from a front diagonal direction, and FIG. 4B is a diagram of the sealing device as viewed from a rear diagonal direction. The resin outer case 17 has an annular outer ring contact surface 17a that is in contact with the axial end surface 2b of the outer ring member 2. In addition, a claw for locking with the connector at the tip of the harness may be provided on the outer periphery of the connector 20.
[0037]
The pulsar ring 16 is formed by vulcanizing and molding a rubber containing magnetic powder, and is magnetized, for example, in such a manner that N poles and S poles are alternately arranged in the circumferential direction. The pulsar ring 16 is fixed to a position on the inner peripheral surface of the annular core 86 of the inner ring side seal ring 82 where the forward / reverse detection sensor 15 can detect a change in the magnetic field of the pulsar ring 16. Note that the sensing direction (inner diameter direction) of the forward / reverse detection sensor 15 and the magnetization direction (axial direction) of the pulsar ring 16 are orthogonal to each other.
[0038]
The sealing device 8 on the vehicle inner side is a state in which the outer ring side sealing ring 81 and the inner ring side sealing ring 82 are combined. With respect to the shoulder 2a on the inner peripheral surface of the outer ring member 2, and with respect to the inner ring side seal ring 82 in which the pulsar ring 16 is incorporated, the annular core 86 is attached to the shoulder 32a on the outer peripheral surface of the tubular member 32. Each is fitted in a tight fit by press fitting.
[0039]
In a state where the outer ring side seal ring 81 and the inner ring side seal ring 82 are combined, the forward / reverse detection sensor 15 is positioned at a position where a change in magnetic flux of the pulsar ring 16 can be detected. In addition, the seal device 8 positions the outer ring contact surface 17 a by contacting the axial end surface 2 b of the outer ring member 2.
[0040]
Next, the rolling bearing device 1 is fixed to the knuckle 9. In the rolling bearing device 1, the inner end of the outer race member 2 on the vehicle inner side is fitted inside the knuckle 9, and the support flange 21 of the outer race member 2 is fixed to the knuckle 9 with the bolt 10.
[0041]
The knuckle 9 is formed in a cylindrical shape except for a portion fixed to the support flange 21, and a cutout 91 through which the connector 20 is inserted is formed in the outer side of the vehicle. The rolling bearing device 1 is fixed to the knuckle 9 while being inserted through the knuckle 9.
[0042]
A harness (not shown) connected to an electronic circuit of the vehicle body is connected to the forward / reverse detection sensor 15. That is, a connector that is detachable from the connector 20 is provided at the tip of the harness. By connecting the connector of the harness to the connector 20, the forward / reverse detection sensor 15 is connected to the electronic circuit of the vehicle body.
[0043]
In the rolling bearing device 1, the outer ring member 2 is fixedly arranged in a non-rotating manner, and when the inner ring member 3 is rotated, each magnetic pole of the pulsar ring 16 that rotates integrally with the inner ring member 3 is provided by two of the forward / reverse detection sensors 15. The magnetic sensors will be sequentially opposed. At this time, since the facing position of the pulsar ring 16 with respect to the forward / reverse detection sensor 15 changes sequentially, the direction of the magnetic flux emitted from the pulsar ring 16 changes alternately, so that the forward / backward detection sensor 15 outputs a rectangular wave signal. The waveform cycle of this rectangular wave signal changes according to the rotation phase and rotation speed of the pulsar ring 16, and the waveform processing is performed to determine the rotation phase, rotation speed, rotation speed, rotation direction, and the like of the inner race member 3.
[0044]
According to the rolling bearing device 1 configured as described above, the harness connecting the forward / backward detection sensor 15 and the electronic circuit of the vehicle body has one end connected to the electronic circuit and the other end integrated with the forward / backward detection sensor 15. The normal / reverse detection sensor 15 is connected to the electronic circuit by connecting the connector of the harness to the connector 20 integrally formed with the normal / reverse detection sensor 15. You. As described above, since the harness is separated from the integrated unit including the sealing device 8, the forward / reverse detection sensor 15, the pulsar ring 16, and the connector 20, when the harness is broken due to the vibration of the vehicle body during traveling, only the harness is connected to the connector. It can be easily removed from the part and replaced, and maintenance can be performed cheaply and easily.
[0045]
By separating the harness from the integrated device including the seal device 8, the forward / reverse detection sensor 15, the pulsar ring 16, and the connector 20, the integrated device including the seal device 8, the forward / reverse detection sensor 15, the pulsar ring 16, and the connector 20 is rolled. When the rolling bearing device 1 is fixed to the knuckle 9 in a state where the rolling bearing device 1 is mounted on the device 1, there is no harness that hinders the fixing operation, and the mountability on the vehicle is improved.
[0046]
The pulsar ring 16 is provided on the inner surface of the annular core bar 86 of the inner ring side seal ring 82, and is molded by the resin outer body 17 on the outer diameter side of the annular core bar 83 of the outer ring side seal ring 81 to detect forward / reverse detection The sensor 15 is provided, and the pulsar ring 16 and the forward / reverse detection sensor 15 are integrated into the seal device 8, so that the rotation detector can be made compact and can be easily installed in a small space such as the drive wheel side.
[0047]
The pulsar ring 16 is fixed to the inner surface of the annular core 86 of the inner ring side seal ring 82, and the forward / reverse detection sensor 15 is provided on the outer diameter side of the annular core 83 of the outer ring side seal ring 81. The pulsar ring 16 and the forward / reverse detection sensor 15 are improved in sealing property and excellent in dust resistance because they are molded and integrated with the body 17.
[0048]
The signal line 18 of the forward / reverse detection sensor 15 is molded with the resin outer body 17, and the connection between the forward / backward detection sensor 15 and the signal line 18 is reinforced, so that disconnection can be prevented. In addition, since the harness is provided separately, the weight of the harness is not applied to the resin exterior body 17, and the sealing property of the resin exterior body 17 is reduced due to insufficient strength until the harness is attached to the connector 20. Can be prevented.
[0049]
The connector 20 is integrally formed with the resin outer body 17 for molding the forward / reverse detection sensor 15 of the outer ring side seal ring 81, so that the insulation and the vibration resistance are excellent and the cost can be reduced.
[0050]
A connector 20 extending in the outer radial direction is provided so as to pass through a notch 91 formed on the vehicle outer side of the knuckle 9, and it is necessary to form a through hole in the axial direction of the knuckle 9 as in the related art. Therefore, it is possible to prevent the strength of the knuckle 9 from decreasing. Moreover, in a state where the sealing device 8 integrally formed with the connector 20 is mounted on the rolling bearing device 1, the connector 20 projecting in the outer diameter direction is fitted into the notch 91 from the vehicle outer side, and the rolling bearing device 1 is mounted. The knuckle 9 can be easily fixed.
[0051]
Since the forward / reverse detection sensor 15 is molded with the resin outer body 17 and is integrally formed with the outer ring side seal ring 81 and the forward / backward detection sensor 15 is protected from the external environment, the reliability is improved.
[0052]
The magnetic sensor is not limited to the forward / reverse detection sensor 15, but may be a sensor that simply detects the rotational speed of the axle. Further, the structure of the seal device 8 is not limited to the above-described embodiment, and may be any configuration including the outer ring-side seal ring 81 serving as a sensor assembly. The arrangement of the magnetic sensor and the magnetic ring is not particularly limited. Absent. Further, the configuration of the present invention is not limited to the configuration applied to the driving wheel side as in the above embodiment, but may be applied to the driven wheel side.
[0053]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the sensor assembly of this invention, a sealing apparatus, and a rolling bearing apparatus, while being able to perform replacement | exchange of a broken harness easily, the vehicle mounting property of a bearing apparatus improves and the effect that the rotation detector can be made compact can be achieved. can get.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an overall configuration of a rolling bearing device for a vehicle according to an embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a main part of FIG.
FIG. 3 is an enlarged cross-sectional view of a sealing device part of FIG. 2;
FIGS. 4A and 4B are perspective views of the sealing device of FIG. 2;
FIGS. 5A and 5B are diagrams showing a phase relationship between detection signals of a forward / reverse detection sensor according to one embodiment of the present invention.
FIG. 6 is an explanatory diagram of a forward / reverse detection sensor according to one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling bearing device 2 Outer ring member 3 Inner ring member 7, 8 Sealing device 9 Knuckle 15 Forward / reverse detection sensor (magnetic sensor)
16 Pulsar ring (magnetic ring)
17 resin exterior body 20 connector 81 outer ring side seal ring (sensor assembly)
82 Inner ring side seal ring

Claims (3)

A sensor assembly fixed to an outer ring member serving as a fixed wheel and detecting a rotation state of an inner ring member serving as a rotating wheel,
A metal ring, a magnetic sensor that detects a magnetic ring fixed to the inner ring member, and a resin outer body that covers the magnetic sensor and is integrated with the metal ring,
The resin exterior body is press-fitted to the inner periphery of the outer ring member, and a connector connected to the magnetic sensor extending in the outer diameter direction is connected to the resin exterior body. A sensor assembly characterized by: An outer ring side seal ring fixed to an outer ring member serving as a fixed ring, and an inner ring side seal ring fixed to an inner ring member serving as a rotating ring,
The outer ring side seal ring is covered with a resin outer body, and a magnetic sensor is integrated.The inner ring side seal ring is fixed with a magnetic ring, and the magnetic sensor extends in the outer diameter direction to the resin outer body. Wherein the connector connected to the inner ring member is detected by the magnetic sensor to detect the rotation of the inner ring member. An inner ring member serving as a rotating wheel having a raceway surface, an outer ring member disposed concentrically with the inner ring member and having a raceway surface corresponding to the inner ring member, and respective raceway surfaces of the inner ring member and the outer ring member A rolling bearing device including a rolling element interposed therebetween and a sealing device for sealing a gap between the inner ring member and the outer ring member,
The seal device includes an outer ring side seal ring fixed to the outer ring member, and an inner ring side seal ring fixed to the inner ring member,
The outer ring side seal ring is covered with a resin outer body, and a magnetic sensor is integrated.The inner ring side seal ring is fixed with a magnetic ring, and the magnetic sensor extends in the outer diameter direction to the resin outer body. And a connector connected to the inner ring member is detected by the magnetic sensor to detect a rotation state of the inner ring member.

Images