JP4314812B2 - Rolling bearing sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing sealing device, and more particularly to a sealing device in which a magnetizing member for detecting rotation is integrated.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a sealing device that is mounted on a rolling bearing that rotatably supports an automobile wheel with respect to a suspension device has been proposed (see, for example, Patent Document 1).
[0003]
An example of a conventional general rolling bearing sealing device is shown in FIGS. 4 is a partial cross-sectional view of the sealing device 10, and FIG. 5 is a cross-sectional view showing a state in which the sealing devices 10 shown in FIG. 4 are stacked in a plurality of stages.
[0004]
The sealing device 10 is a pack seal with a magnetized member, and includes an annular cored bar 2, a slinger 3, a seal member 4, and a pulsar ring 5. In such a sealing device 10, the core metal 2 is fitted into the outer ring of the rolling bearing, and the slinger 3 is fitted into the inner ring of the rolling bearing. The outer ring of the rolling bearing is fixed to the vehicle body, and the inner ring is fitted and fixed to the axle.
[0005]
The sealing device 10 is stored by being stacked in a plurality of stages in a packed box during delivery or transportation. Further, as shown in FIG. 5, in the process of press-fitting into the rolling bearing, the sealing devices 10 stacked on the mounting table 11 are conveyed one by one into the chute by the handling device of the automatic press-fitting machine and press-fitted.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-213620
[Problems to be solved by the invention]
As shown in FIG. 5, a downward force F is applied to the stacked sealing devices 10 by the weight of the sealing devices 10 stacked on the upper stage.
[0008]
In the sealing device 10, a pulsar ring 5 provided on the outer surface of the slinger 3 protrudes from the front end in the axial direction of the core metal 2 by a dimension C.
[0009]
For this reason, when a downward force F is applied to the sealing device 10, the slinger 3 is pushed downward until the core metal 2 of the upper sealing device 10 comes into contact with the axial end of the core metal 2, and directly on the mounting table 11. The tip 3a of the slinger 3 projects downward from the outer surface of the cored bar 2 except for the lowermost sealing device 10 that is placed.
[0010]
When the sealing device 10 is taken out of the box and sent to the assembly machine, or when it is conveyed into the chute by the handling device of the automatic press-fitting machine, the lowermost sealing device 10 among the stacked sealing devices 10 slides in the horizontal direction. To be extracted.
[0011]
When the lowermost sealing device 10 is slid in the horizontal direction, the protruding tip 3a of the slinger 3 of the upper sealing device 10 is caught by the pulsar ring 5 of the lowermost sealing device 10, making smooth extraction difficult. There was a problem.
[0012]
[Means for Solving the Problems]
The present invention relates to a cored bar comprising a cylindrical cored bar part and an annular plate-shaped cored bar part extending in a radial direction from an edge of the cylindrical cored bar part, a cylindrical slinger part, and an edge of the cylindrical slinger part A slinger composed of an annular slinger portion extending in a radial direction from the annular seal member attached to the core metal and in sliding contact with the slinger, and an annular magnetized member provided on an outer surface of the annular slinger portion of the slinger, The cored bar and the slinger are combined by arranging the cylindrical cored bar part and the cylindrical slinger part facing each other, and arranging the annular plate cored bar part and the annular slinger part facing each other. And the outermost main surface of the ring-plate-shaped cored bar portion of the cored bar is protruded from the axial tip of the cylindrical cored bar part of the cored bar. Dimension outward from the axial tip of the slinger A sealing device mounted in the axial end portion of the rolling bearing while being protruded, the outermost major surface of said dimension B the ring shaped core metal portion is protruded, said ring plate cored bar The flat surface is parallel to the surface perpendicular to the axial direction, and the relationship between the protruding dimension A and the protruding dimension B is A <B. In addition, about the said ring plate-shaped metal core part, the part which respond | corresponds in embodiment is called the cyclic | annular metal core part.
[0013]
The rolling bearing to which the sealing device of the present invention is attached may be either inner ring rotation or outer ring rotation. For example, when mounting on a rolling bearing for inner ring rotation, a slinger is mounted on the inner ring that is a rotating ring, and a core metal is mounted on the outer ring that is a fixed ring. The reverse is true for outer ring rotation.
[0014]
According to the rolling bearing sealing device of the present invention, when a downward force is applied to each sealing device in a state where the sealing devices are stacked, the slinger is pushed downward by the core metal of the upper sealing device and moves downward. The distance that the slinger moves downward is such that the core metal of the upper sealing device is in contact with the axial tip of the cylindrical metal core part of the core metal, and the outer surface of the annular magnetized member is that of the cylindrical metal core part of the core metal. This corresponds to the dimension A that is flush with the axial tip. Here, the outer side surface of the annular magnetized member projects dimension A outward (in one direction) in the axial direction from the axial tip of the cylindrical cored bar portion of the cored bar, and the outer side surface of the annular plate-shaped cored bar portion of the cored bar However, since the dimension B protrudes outward (in the other direction) in the axial direction from the axial end of the cylindrical slinger part of the slinger, and the relationship between the protrusion dimension A and the protrusion dimension B is A <B, the slinger is only dimension A downward. Even if it moves, the axial tip of the cylindrical slinger part does not protrude downward from the outer surface of the ring-plate cored bar part of the cored bar. Therefore, when the stacked sealing devices are slid in the horizontal direction and extracted, the cylindrical slinger portion can be prevented from being caught by the annular magnetized member of the lower sealing device, and the extraction operation can be performed smoothly.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on the embodiment shown in FIGS. FIG. 1 is a partial cross-sectional view of a sealing device according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of the sealing device in use, and FIG. 3 is a cross-sectional view showing a state where the sealing devices are stacked in a plurality of stages.
[0016]
The sealing device 1 is a pack seal with a magnetized member, and includes a cored bar 2, a slinger 3, an annular seal member 4, and a pulsar ring 5.
[0017]
The metal core 2 is formed by bending a metal plate and has an L-shaped cross section including a cylindrical metal core part 21 and an annular metal core part 22 extending radially inward from the edge of the cylindrical metal core part 21. The annular cored bar 22 has a bent portion 23 that is bent inward in the axial direction. As a material of the cored bar 2, for example, SPCC, SPCD, or SPCE (cold rolled steel sheet) that is a magnetic material is used.
[0018]
The slinger 3 is formed by bending a metal plate such as a rust-proof rolled steel plate, and includes a cylindrical slinger portion 31 and an annular slinger portion 32 that extends radially outward from the edge of the cylindrical slinger portion 31. The cross section is formed into an L-shape. The slinger 3 is desirably formed of a magnetic material so that the magnetic field strength of the pulsar ring 5 described later increases and rotation detection is easy. As the magnetic material, for example, ferritic stainless steel (JIS standard SUS430, etc.) is used.
[0019]
The cored bar 2 and the slinger 3 are combined with the cylindrical cored bar 21 and the cylindrical slinger 31, and the annular cored bar 22 and the annular slinger 32 are opposed to each other to form a pack seal. ing.
[0020]
An annular seal member 4 made of rubber or the like is attached to the core metal 2. The annular seal member 4 is a long member extending along the entire circumference of the core metal 2, and includes two radial lips 41 and 42 that are in sliding contact with the outer peripheral surface of the cylindrical slinger portion 31 of the slinger 3, and an annular shape. And an axial lip 43 slidably in contact with the inner surface of the slinger portion 32.
[0021]
The annular seal member 4 is attached to the inner surface of the cored bar 2 with the locking part 44 locked to the outer surface of the bent part 23 of the annular cored bar 22.
[0022]
The pulsar ring 5 is provided as an annular magnetized member on the outer surface of the annular slinger portion 32 of the slinger 3, and is mixed with rubber and vulcanized and molded, and the N pole and S pole alternately in the circumferential direction. Are bonded to the outer surface of the annular slinger portion 32.
[0023]
In the state where the sealing device 1 is combined, the outer surface 5a of the pulsar ring 5 protrudes from the axial tip 21a of the cylindrical metal core portion 21 of the metal core 2 in the axial direction outward (rightward in FIG. 1) by a dimension A, The outer surface 22a of the second annular cored bar 22 protrudes from the axial tip 31a of the cylindrical slinger 31 of the slinger 3 outward in the axial direction (leftward in FIG. 1) by a dimension B. The relationship between the protruding dimension A and the protruding dimension B is A ≦ B.
[0024]
For example, the dimension A is 0.5 [mm] or less, and the dimension B is 0.5 [mm] or more.
[0025]
As shown in FIG. 2, such a sealing device 1 is attached to an end portion in the axial direction of a wheel rolling bearing for inner ring rotation, and seals the inside of the rolling bearing.
[0026]
In FIG. 2, this rolling bearing includes an outer ring 6 fixed to a vehicle body or the like, an inner ring 7 in which an axle is fitted, and a plurality of balls 8 interposed between the outer ring 6 and the inner ring 7. The core metal 2 of the sealing device 1 is press-fitted and fixed to the inner peripheral surface of the outer ring 6 of the rolling bearing, and the slinger 3 is press-fitted and fixed to the outer peripheral surface of the inner ring 7. A magnetic sensor 9 that constitutes a rotation detecting device together with the pulsar ring 5 is disposed opposite to the pulsar ring 5 that is disposed on the outer surface in the axial direction of the rolling bearing. In such a rolling bearing, when the pulsar ring 5 rotates together with the inner ring 7, the S pole and the N pole alternately pass in the vicinity of the detection surface of the magnetic sensor 9, and the direction of the magnetic flux flowing in the sensor changes. Due to this change in magnetic flux, the signal of a magnetic detection element such as a Hall element incorporated in the sensor changes. The frequency at which this signal changes is proportional to the rotational speed of the axle, and the signal is sent to the controller to detect the rotational speed and control the antilock brake system (ABS) and the like.
[0027]
With reference to FIG. 3, the case where the sealing device 1 is stacked in multiple stages will be described.
[0028]
In the case of the sealing devices 1 stacked in FIG. 3, the annular cored bar 22 of the cored bar 2 of the upper sealing device 1 is placed on the pulsar ring 5 of the lowermost sealing device 1.
[0029]
When a downward force F is applied to each sealing device 1, the slinger 3 is pushed downward by the core metal 2 of the upper sealing device 1 and moves downward. The distance by which the slinger 3 moves downward is such that the core metal 2 of the upper sealing device 1 abuts on the axial tip 21 a of the cylindrical core metal part 21 of the core metal 2 and the outer surface 5 a of the pulsar ring 5 is the core metal 2. This corresponds to the dimension A that is flush with the axial tip 21 a of the cylindrical cored bar 21.
[0030]
Here, the outer surface 5 a of the pulsar ring 5 protrudes in the axial direction outwardly from the axial tip 21 a of the cylindrical core member 21 of the core metal 2, and the outer surface 22 a of the annular core member 22 of the core metal 2 is The cylindrical slinger portion 31 of the slinger 3 protrudes in the axial direction outward from the axial tip 31a, and the relationship between the protruding dimension A and the protruding dimension B satisfies A ≦ B.
[0031]
Therefore, even if the slinger 3 moves downward by the dimension A, the axial tip 31a of the cylindrical slinger part 31 does not protrude downward from the outer surface 22a of the annular core part 22 of the core metal 2.
[0032]
According to the rolling bearing sealing device configured as described above, when the sealing device 10 is taken out of the box and sent to the assembly machine, or when it is conveyed into the chute by the handling device of the automatic press-fitting machine, the stacked sealing devices 10 are stacked. Since the tip end 31a in the axial direction of the cylindrical slinger portion 31 does not protrude below the outer surface 22a of the annular core portion 22 of the core metal 2, the cylindrical slinger portion 31 is sealed in the lower stage. It is possible to prevent the apparatus 1 from being caught by the pulsar ring 5 and to perform the extraction operation smoothly.
[0033]
The outer surface 5a of the pulsar ring 5 protrudes from the axial tip 21a of the cylindrical core member 21 of the core metal 2 in the axial direction outwardly by the dimension A, and the outer surface 22a of the annular core member 22 of the core metal 2 is A dimension B protrudes outward in the axial direction from the axial tip 31a of the cylindrical slinger part 31 of the slinger 3, and the relationship between the protrusion dimension A and the protrusion dimension B only needs to be A ≦ B, and is not limited to the structure of FIG. . For example, as in the sealing device shown in the conventional example (FIG. 4), the axial tip 21a of the cylindrical core 21 of the core 2 and the outer surface of the annular slinger 32 of the slinger 3 are substantially flush. Then, the metal core 2 protrudes outward in the axial direction from the axial tip 21a of the cylindrical core part 21 by the thickness of the pulsar ring 5 (protrusion dimension A), and the ring of the core metal 2 has a value corresponding to a dimension B larger than the dimension A. The outer surface 22a of the cored bar part 22 may be protruded axially outward from the axial tip 31a of the cylindrical slinger part 31 of the slinger 3.
[0034]
When the sealing device 1 is mounted on a rolling bearing for rotating the outer ring, the cored bar is fitted and fixed to the inner ring serving as a fixed ring, and the slinger is fitted and fixed to the outer ring serving as a rotating ring. The cored bar is composed of a cylindrical cored bar part that fits to the outer peripheral surface of the inner ring and an annular cored bar part that extends radially outward from the edge of the cylindrical cored bar part, and the slinger is fitted to the inner peripheral surface of the outer ring. It consists of a cylindrical slinger part that fits together and an annular slinger part that extends radially inward from the edge of this cylindrical slinger part. An annular seal member that is in sliding contact with the slinger is attached to the core metal, and an annular magnetized member is provided on the outer surface of the annular slinger portion of the slinger.
[0035]
【The invention's effect】
According to the rolling bearing sealing device of the present invention, when the stacked sealing device is slid and pulled out in the horizontal direction, the axial tip of the cylindrical slinger portion does not protrude downward from the outer surface of the annular core metal portion of the core metal. Therefore, it is possible to prevent the cylindrical slinger portion from being caught by the pulsar ring of the lower-stage sealing device, and the effect that the extraction operation can be performed smoothly is obtained.
[Brief description of the drawings]
1 is a partial cross-sectional view of a sealing device according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view illustrating a usage state of the sealing device of FIG. 1. FIG. 3 is a cross-sectional view illustrating a stacked state of the sealing device of FIG. FIG. 4 is a partial sectional view of a conventional sealing device. FIG. 5 is a partial sectional view showing a stacked state of the sealing device in FIG.
DESCRIPTION OF SYMBOLS 1 Sealing device 2 Core metal 3 Slinger 4 Annular seal member 5 Pulsar ring (annular magnetized member)
21 Cylindrical core part 22 Annular core part 31 Cylindrical slinger part 32 Annular slinger part

Claims (1)

A cored bar composed of a cylindrical cored bar part and an annular plate-shaped cored bar part extending in a radial direction from an edge of the cylindrical cored bar part, a cylindrical slinger part and a radial direction from the edge of the cylindrical slinger part A slinger comprising an extending annular slinger part, an annular seal member mounted on the core metal and in sliding contact with the slinger, and an annular magnetized member provided on an outer surface of the annular slinger part of the slinger,
The cored bar and the slinger are combined by arranging the cylindrical cored bar part and the cylindrical slinger part facing each other, and arranging the annular plate cored bar part and the annular slinger part facing each other,
The outer surface of the annular magnetized member is projected by a dimension A outward in the axial direction from the axial tip of the cylindrical metal core part of the core metal, and the outermost main surface of the ring-plate core metal part of the metal core A sealing device attached to the axial end portion of the rolling bearing with a dimension B protruding outward in the axial direction from the axial tip of the cylindrical slinger portion of the slinger,
The outermost major surface of said dimension B the ring shaped core metal portion which is protruded, and a flat surface parallel to the plane perpendicular to the axial direction of the ring-shaped core metal portion,
The relationship between the protruding dimension A and the protruding dimension B is as follows:
A <B
A rolling bearing sealing device characterized by that.

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