JP4258214B2 - Rolling bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention incorporates a sensor for detecting rotation and a pulsar ring used in an ABS (anti-lock brake system) or the like of a so-called pack seal, and the inner and outer rings of the seal device incorporating the rotation detector. It is related with the rolling bearing apparatus formed by sealing the clearance gap.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a bearing device that supports a vehicle wheel rotatably with respect to a vehicle body, and includes a rotation detector used for ABS or the like (see, for example, Patent Document 1).
[0003]
The bearing device includes rolling elements between the raceway surfaces of the outer ring, which is a rotating ring fixed to the wheel side, and the inner ring, which is a fixed ring fixed to the vehicle body side, and a gap between the inner and outer rings is a sealing device. It is sealed with.
[0004]
The rotation detector is configured to detect a change in a magnetic field of a pulsar ring fixed to an outer ring 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]
Japanese Patent Laid-Open No. 2000-211311
[Problems to be solved by the invention]
However, the detection surface of the sensor of the rotation detector and the detection surface of the pulsar ring are arranged facing each other, and an air gap is required between them, which increases the installation space for the rotation detector. As a result, the bearing device There was a problem of increasing the size.
[0007]
Further, since the seal lip and the rotation detector of the seal device are arranged side by side in the axial direction, there is a problem that the bearing device is enlarged.
[0008]
Thus, the bearing device has been increased in size and reduced in size.
[0009]
[Means for Solving the Problems]
The present invention provides an inner ring member that is a fixed ring having a raceway surface, an outer ring member that is concentrically arranged with the inner ring member and has a raceway surface corresponding to the inner ring member, the inner ring member, and the outer ring member. A rolling bearing device comprising: a rolling element interposed between the raceway surfaces; a seal device that seals a gap between the inner ring member and the outer ring member; and a rotation detector that detects a rotation state of the outer ring member. The seal device includes an outer ring side seal ring fixed to the outer ring member, an inner ring side seal ring fixed to the inner ring member, and an annular cored bar of the inner ring side seal ring on an inner peripheral side of the outer ring side seal ring. consists of a lip which is applied to the tip is in contact with, the rotation detector includes a magnetic sensor provided on the outer peripheral surface of the annular core metal of the inner ring side seal ring, the outer ring side Shirurin Of consists of a magnetic ring provided on the axial side of the annular core metal, the detection surface and the detection surface of the magnetic ring of magnetic sensors are arranged in mutually orthogonal, the magnetic ring in the magnetic sensor Is detected to detect the rotation state of the outer ring member.
[0010]
The magnetic sensor is molded with a resin outer casing and integrated with the annular core of the inner ring side seal ring, and a labyrinth is formed between the resin outer casing and the annular core of the outer ring side seal ring. To do.
The outer ring side seal ring includes a first annular plate portion along a radial direction, a first cylindrical portion formed by bending a radially outer end side of the first annular plate portion outward in the axial direction, and the first cylinder. The inner ring side seal ring includes a second cylindrical portion along the axial direction, and a second cylindrical portion formed by bending a radially outer end side of the portion in a radially outward direction. A third annular plate portion that is bent radially outward at the axially outer end side of the second cylindrical portion, and a second annular plate portion that is bent radially inward at the radially outer end side of the third annular plate portion. It has an annular core consisting of three cylindrical parts.
The harness of the magnetic sensor is divided into a first harness connected to the magnetic sensor and a second harness connected to the electronic circuit of the vehicle body, and is connected to each other via a connector provided on the knuckle.
[0011]
As the rotation detector, for example, an active detector that changes the output according to the change of magnetic flux is used. The magnetic ring is a pulsar ring, and the magnetic sensor is two magnetic sensors arranged apart in the circumferential direction. Examples include a configured forward / reverse detection sensor.
[0012]
According to the rolling bearing device of the present invention, the magnetic ring is provided on the axial side surface of the annular core of the outer ring side seal ring, and the magnetic sensor is provided on the outer circumferential surface of the annular core of the inner ring side seal ring. The magnetic ring and the magnetic sensor are integrated into the sealing device in a compact manner, and the detection surface of the magnetic sensor and the detection surface of the magnetic ring are arranged orthogonally, and an air gap is provided between each other as in a face-to-face arrangement. Is unnecessary, and the rotation detector can be made compact.
[0013]
The magnetic ring is fixed to the axial side surface of the annular cored bar of the outer ring side seal ring, and the magnetic sensor is molded with a resin outer package on the outer peripheral surface of the annular cored bar of the inner ring side seal ring. Integrated, the sealing of the magnetic ring and the magnetic sensor is improved, and the dust resistance is excellent.
[0014]
A labyrinth is formed between the resin outer package in which the magnetic sensor is molded and the annular cored bar of the outer ring side seal ring, and muddy water or the like can be prevented from entering the annular bearing space between the inner and outer ring members from the outside.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0016]
1 is a cross-sectional view showing an 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. 3 is a cross-sectional view of a seal device portion of FIG. 3 is a front view of the sealing device portion of FIG. 3, FIG. 5 is a partially enlarged cross-sectional view of the sealing device portion of FIG. 3, FIG. 6 is a diagram showing the phase relationship of detection signals of two magnetic sensors, and FIG. FIG. 8 is a cross-sectional view of the drive wheel showing the harness connection structure of the forward / reverse detection sensor.
[0017]
The rolling bearing device 1 of the present embodiment is used on the driving wheel side or the driven wheel side of an automobile. In FIG. 1, the left side is the vehicle outer side and the right side is the vehicle inner side.
[0018]
The inner ring member 3 that is non-rotatably supported on the vehicle body side is connected to the outer ring member via two rows of balls (an example of rolling elements) 4, 5 that are disposed in the circumferentially equidistant positions on the crown-shaped cage 6. 2 is supported rotatably around the axis.
[0019]
A pair of outer ring raceway surfaces for both rows of balls 4 and 5 are formed on the inner peripheral surface of the outer ring member 2. A flange 21 is formed on the outer peripheral surface of the outer ring member 2 so as to protrude outward in the radial direction. A brake disc rotor and a tire wheel are attached to the flange 21 with bolts 10, and the wheel is attached to the tire wheel.
[0020]
The inner ring member 3 is composed of a pair of inner rings 31 and 32 that form inner ring raceway surfaces of the balls 4 and 5 in each row.
[0021]
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, and muddy water or the like enters from the outside. Sealing devices 7 and 8 are provided to prevent this.
[0022]
The vehicle inner side sealing device 7 is configured by combining an outer ring side seal ring 71 and an inner ring side seal ring 72.
[0023]
The outer ring side seal ring 71 is attached to the outer ring member 2 side, and has a configuration in which a lip 74 is attached to an annular cored bar 73. The annular metal core 73 includes an annular plate portion 73a along the radial direction, a cylindrical portion 73b formed by bending the radially outer end side of the annular plate portion 73a outward in the axial direction, and an axially outer end side of the cylindrical portion 73a. And an annular plate portion 73c that is bent radially outward. Then, the annular plate portion 73 c is brought into contact with the vehicle inner side end surface of the outer ring member 2, and the cylindrical portion 73 b is press-fitted into the shoulder portion 2 a of the outer ring member 2.
[0024]
The inner ring side seal ring 72 is attached to the inner ring 32 side, and includes a cylindrical part 75a along the axial direction, an annular plate part 75b formed by bending the axially outer end side of the cylindrical part 75a radially outward, It is comprised with the cyclic | annular metal core 75 which consists of the cylindrical part 75c formed by bending the radial direction outer end side of the cyclic | annular board part 75b to axial direction inward. The cylindrical portion 75a is press-fitted to the shoulder portion 32a of the inner ring 32.
[0025]
The lip 74 is made of rubber such as nitrile butadiene rubber (NBR) and is vulcanized and bonded to the annular core metal 73. Further, the annular cored bar 75 of the inner ring side seal ring 72 is formed of a nonmagnetic material such as stainless steel, for example.
[0026]
The inner ring side seal ring 72 is integrated with a forward / reverse detection sensor 15 as a magnetic sensor, and the outer ring side seal ring 71 is integrally incorporated with a pulsar ring 16 as a magnetic ring. The rotation of the outer ring member 2 is detected by the pulsar ring 16.
[0027]
The forward / reverse detection sensor 15 is composed of, for example, two magnetic sensors that are spaced apart from each other in the circumferential direction, such as a Hall element or a magnetoresistive element, and can detect the rotational direction in addition to the rotational angle. As shown in FIG. 6, the phase relationship between the detection signals of the two magnetic sensors is such that when one magnetic sensor outputs the rectangular wave signal of FIG. 6A, the other magnetic sensor is 90 degrees out of phase. It arrange | positions so that the rectangular wave signal of 6 (B) may be output. Depending on the advance / deceleration of both magnetic sensors, it is possible to determine the clockwise or counterclockwise rotation direction.
[0028]
As the forward / reverse detection sensor 15, as shown in FIG. 7, a Hall IC incorporating two Hall elements 22 may be used. That is, with respect to the magnetization pitch λ of the pulsar ring 16, the two Hall elements 22 are arranged at an interval (λ / 4) at which the output phase of each pulsar ring 16 is 90 degrees, so that the rotation direction can be detected.
[0029]
The forward / reverse detection sensor 15 is mounted on the outer peripheral surface of the cylindrical portion 75c of the annular cored bar 75 of the inner ring side seal ring 72, and has a resin exterior with a thickness that covers the forward / reverse detection sensor 15 on the outer diameter of the cylindrical portion 75c. The body 17 is provided by integral molding (insert molding). The resin exterior body 17 is made of engineer plastic such as polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyamide (PA), and the like.
[0030]
Signal lines 18 and 19 are connected to the forward / reverse detection sensor 15, and the signal lines 18 and 19 are bundled and covered with a harness 20 made of an insulating pipe. The harness 20 extends in the outer diameter direction.
[0031]
A flange for positioning the forward / reverse detection sensor 15 in the axial direction in a state where the guide convex portion 17 a in which the harness 20 is embedded and the inner ring side seal ring 72 are attached to the inner ring 32 are provided on the resin outer body 17. 17b is provided integrally.
[0032]
The pulsar ring 16 is formed by vulcanizing and molding rubber containing magnetic powder, and is magnetized, for example, in such a manner that N and S poles are alternately arranged in the circumferential direction. The pulsar ring 16 is fixed to a position where the forward / reverse detection sensor 15 can detect a change in the magnetic field of the pulsar ring 16 on the axial side surface of the annular plate 73 a of the annular core 73 of the outer ring side seal ring 71. The detection surface (inner diameter direction) 15a of the forward / reverse detection sensor 15 and the detected surface (axial direction) 16a of the pulsar ring 16 are orthogonal to each other.
[0033]
By the way, the sealing device 7 on the vehicle inner side has an annular core 75 for the inner ring side seal ring 72 incorporating the forward / reverse detection sensor 15 in a state where the outer ring side seal ring 71 and the inner ring side seal ring 72 are combined. The outer ring side seal ring 71 incorporating the pulsar ring 16 is connected to the shoulder part 32a of the inner ring 32 with respect to the shoulder part 2a of the outer ring member 2. It is attached in a tight fit state by press fitting. A labyrinth S is formed between the resin outer casing 17 and the annular core 73 of the outer ring side seal ring 71 from the cylindrical portion 73b to the annular plate portion 73c.
[0034]
The connection of the harness 20 of the forward / reverse detection sensor 15 will be described with reference to FIG.
The harness 20 of the forward / reverse detection sensor 15 is divided into a first harness 20a connected to the forward / reverse detection sensor 15 and a second harness 20b connected to an electronic circuit of the vehicle body.
[0035]
The first harness 20a and the second harness 20b are connected by connecting connectors 23 provided at the ends of each other. The connector 23a at the tip of the first harness 20a is fixed to the knuckle 9 that fixes the outer ring member 2 by the connector bracket 24, and the connector 23b at the tip of the second harness 20b is connected to the connector 23a of the first harness 20a. Removably connected.
[0036]
The second harness 20b is fixed to the vehicle body via the protector 25 and the protector bracket 26, and is connected to an electronic circuit.
[0037]
Reference numeral 27 denotes a brake disk, 28 denotes a brake pad, and 29 denotes a shock absorber.
[0038]
In the rolling bearing device 1, when the inner ring member 3 is fixedly arranged in a non-rotating manner and the outer ring member 2 is rotated, each magnetic pole of the pulsar ring 16 that rotates integrally with the outer ring member 2 includes two forward / reverse detection sensors 15. The magnetic sensor is sequentially opposed to the magnetic sensor. At this time, since the facing position of the pulsar ring 16 is sequentially changed with respect to the forward / reverse detection sensor 15, the direction of the magnetic flux emitted from the pulsar ring 16 is alternately changed, so that an AC voltage is output from the forward / reverse detection sensor 15. The waveform period of this AC voltage changes according to the rotational phase and rotational speed of the pulsar ring 16. By processing the waveform of this AC voltage, the rotational phase, rotational speed, rotational speed, rotational direction, etc. of the outer ring member 2 are obtained.
[0039]
According to the rolling bearing device 1 configured as described above, the pulsar ring 16 is provided on the side surface in the axial direction of the annular plate portion 73a of the annular core 73 of the outer ring side seal ring 71, and the annular core of the inner ring side seal ring 72 is provided. The forward / reverse detection sensor 15 is provided on the outer peripheral surface of the cylindrical portion 75c of the 75, the pulsar ring 16 and the forward / reverse detection sensor 15 are compactly integrated with the seal device 7, and the detection surface 15a of the forward / reverse detection sensor 15 is provided. And the detected surface 16a of the pulsar ring 16 are arranged orthogonally, and an air gap is not required between them as in the face-to-face arrangement, and the rotation detector can be made compact.
[0040]
The pulsar ring 16 is fixed to the axial side surface of the annular plate 73a of the annular core 73 of the outer ring side seal ring 71, and the forward / reverse detection sensor 15 is a cylindrical portion of the annular core 75 of the inner ring side seal ring 72. The outer peripheral surface of 75c is molded and integrated with the resin outer casing 17, and the sealing performance of the pulsar ring 16 and the forward / reverse detection sensor 15 is improved and the dust resistance is excellent.
[0041]
A labyrinth S is formed between the resin exterior body 17 in which the forward / reverse detection sensor 15 is molded and the cylindrical portion 73b and the annular plate portion 73c of the annular core 73 of the outer ring side seal ring 71. It is possible to prevent muddy water or the like from entering the annular bearing space 11 between the three.
[0042]
The forward / reverse detection sensor 15 can detect the rotational speed and direction of the outer ring member 2.
[0043]
The harness 20 of the forward / reverse detection sensor 15 is divided into a first harness 20a connected to the forward / reverse detection sensor 15 and a second harness 20b connected to an electronic circuit of the vehicle body, and via a connector 23 provided on the knuckle 9. Are connected to each other. For this reason, since the rolling bearing device 1 and the knuckle 9 are both connected to the damper against the shaking of the vehicle body during traveling, the forward / reverse detection sensor 15 and the knuckle 9 fixed to the rolling bearing device 1 are provided. The vibration of the vehicle body is not transmitted to the connector 23, and the first harness 20a connecting them is not disconnected by the shaking of the vehicle body. However, since the electronic circuit provided in the vehicle body vibrates due to the shaking of the vehicle body, the second harness 20b connecting the connector 23 provided in the knuckle 9 and the electronic circuit provided in the vehicle body is disconnected due to the shaking of the vehicle body. There is a fear. Thus, when the second harness 20b is disconnected due to the shaking of the vehicle body, the entire hub unit including the bearing device is replaced by removing the connector 23b of the second harness 20b from the connector 23a of the first harness 20a and replacing it. Therefore, the forward / reverse detection sensor 15 can be used without replacement, and maintenance can be easily performed at low cost.
[0044]
The resin outer casing 17 is molded from the forward / reverse detection sensor 15 to the harness 20, and the connecting portion between the forward / reverse detection sensor 15 and the signal lines 18 and 19 is reinforced to prevent disconnection.
[0045]
The magnetic sensor is not limited to the forward / reverse detection sensor 15, and may detect only the rotational speed of the outer ring member 2.
[0046]
Moreover, the harness 20 is not divided | segmented, It is good also as what connects the normal / reverse detection sensor 15 and the electronic circuit of a vehicle body.
[0047]
【The invention's effect】
According to the rolling bearing device of the present invention, it is possible to save the space of the rotation detector and to obtain an effect that the bearing device can be made compact.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the overall configuration of a rolling bearing device for a vehicle according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of FIG.
3 is a cross-sectional view of the sealing device portion of FIG. 2;
4 is a front view of the sealing device portion of FIG. 2;
5 is a partial enlarged cross-sectional view of the sealing device portion of FIG. 2;
FIG. 6 is a diagram showing a phase relationship of detection signals of a forward / reverse detection sensor according to an embodiment of the present invention.
FIG. 7 is an explanatory diagram of a forward / reverse detection sensor according to an embodiment of the present invention.
FIG. 8 is a sectional view of a driven wheel showing a harness connection structure of a forward / reverse detection sensor according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 2 Outer ring member 3 Inner ring member 7 Sealing apparatus 15 Forward / reverse detection sensor (magnetic sensor)
16 Pulsar ring (magnetic ring)
17 resin exterior body 20 harness 71 outer ring side seal ring 72 inner ring side seal ring

Claims (4)

An inner ring member serving as a fixed ring having a raceway surface, an outer ring member serving as a rotating ring having a raceway surface disposed concentrically with the inner ring member, and each raceway surface of the inner ring member and the outer ring member In a rolling bearing device comprising: a rolling element interposed therebetween; a seal device that seals a gap between the inner ring member and the outer ring member; and a rotation detector that detects a rotation state of the outer ring member.
The seal device includes an outer ring side seal ring fixed to the outer ring member, an inner ring side seal ring fixed to the inner ring member, an annular metal core and a tip of the inner ring side seal ring on an inner peripheral side of the outer ring side seal ring It consists of a lip that is attached so that it touches ,
The rotation detector comprises a magnetic sensor provided on the outer peripheral surface of the annular cored bar of the inner ring side seal ring, and a magnetic ring provided on the axial side surface of the annular cored bar of the outer ring side seal ring, The detection surface of the magnetic sensor and the detection surface of the magnetic ring are arranged orthogonal to each other, and the rotation state of the outer ring member is detected by detecting the magnetic ring with the magnetic sensor. Rolling bearing device. The rolling bearing device according to claim 1,
The magnetic sensor is molded with a resin exterior body and integrated with the annular core metal of the inner ring side seal ring,
A rolling bearing device, characterized in that a labyrinth is formed between the resin exterior body and the annular cored bar of the outer ring side seal ring. The rolling bearing device according to claim 1,
The outer ring side seal ring includes a first annular plate portion along a radial direction, a first cylindrical portion formed by bending a radially outer end side of the first annular plate portion outward in the axial direction, and the first cylinder. Having an annular cored bar composed of a second annular plate part formed by bending the axially outer end side of the part radially outwardly,
The inner ring side seal ring includes a second cylindrical portion along the axial direction, a third annular plate portion formed by bending the axially outer end side of the second cylindrical portion radially outward, and the third annular plate. A rolling bearing device comprising: an annular cored bar comprising a third cylindrical part formed by bending the radially outer end side of the part inward in the axial direction. The rolling bearing device according to claim 1,
The harness of the magnetic sensor is divided into a first harness connected to the magnetic sensor and a second harness connected to the electronic circuit of the vehicle body, and is connected to each other via a connector provided on the knuckle. A rolling bearing device characterized by.

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