JP2008145186A - Encoder, pack seal, double-row bearing unit, and hub unit bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an encoder capable of preventing the adhesion of heaped encoders, even if they are encoder single bodies, and a core bar and easily separating them from one another and provide a pack seal in which the encoder is incorporated. <P>SOLUTION: The encoder 1 comprises both a slinger 20 constituted in an L-shaped cross section by integrally extending an annular ring part 22 extended in an outer-diameter direction from one end 21a of a cylindrical part 21 and an annular-ring-like elastic material 10 integrally vulcanized and molded and provided for an outer surface of the annular ring part 22 of the slinger 20 and magnetized to form multi-poles. Protrusions 30 are provided for the outer surface of the elastic material of the encoder 1 close to its inner diameter in such a way as to orient outward in an axial direction. When encoders 1 are in a state heaped in a rod shape, protrusions 30 of an elastic material 10 come into contact with end parts 23 of a slinger 20 of an upper encoder 1 at their tip parts 31 to have a gap G between the end parts 23 of the slinger 20 and the front surface 11 of the elastic material 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an encoder used for detecting the rotational speed of a hub unit bearing, and more particularly to an improvement of an encoder capable of preventing the encoder surface from being damaged during supply.

Conventionally, when measuring the rotation direction and the number of rotations of a rotating wheel, a method of detecting information encoded along the rotation direction by a detection element is generally known, and particularly in a hub bearing unit. An encoder 1 of a type that detects the rotational direction and the rotational speed in the axial direction is used.
In general, as shown in FIG. 8A, the encoder 1 is configured to have an L-shaped cross-sectional view by integrally extending an annular portion 22 extending in the outer diameter direction from one end 21 a of the cylindrical portion 21. A slinger 20 and an annular elastic member 10 that is integrally vulcanized and formed on the outer surface of the annular portion 22 of the slinger 20 are magnetized in multiple poles. At this time, the slinger 20 is made of a magnetic material and serves as a back yoke. In addition to controlling the output direction of the magnetic force of the encoder, the slinger 20 prevents the magnetic force from reaching the inside of the bearing.
Further, as shown in FIG. 8B, the encoder 1 is composed of a core metal 42 and an elastic material (for example, seal rubber) 44 having seal lips 45 and 46 provided integrally with the core metal 42. The seal lips 45 and 46 are combined so as to face the seal member 40, and the seal lips 45 and 46 are disposed between the outer peripheral surface of the cylindrical portion 21 of the encoder 1 and the outer peripheral surface of the cylindrical portion 21 and the inner peripheral surface of the annular portion 22. It may be used as a pack seal 2 that forms a seal region.
In addition, in the pack seal 2 incorporating the encoder 1 and the encoder 1, the magnetization of the encoder 1 (magnetization on the elastic material 10) may be completed when the encoder 1 is manufactured by a supplier and shipped. is there.

When such an encoder 1 is supplied as a part from a supplier, the encoder 1 is shipped in a state of being stacked in a bar shape for efficient packaging. As an example, FIG. 9 shows a state in which a large number of encoders 1 are stacked in a bar shape.
Then, in the bearing manufacturing process, the encoder 1 is set in a rod-like manner on a straight-cut type cutting and distributing device 60 that is delivered to a press-fitting device (not shown) that is press-fitted into the bearing separately.
In the straight-ahead type distribution device 60, the lowermost encoder 1 is pushed by the pusher 50 in the lateral direction, and is delivered separately from the upper encoder 1.
At this time, the encoder 1 is stacked in a state where the magnetized elastic material 10 is attracted to and integrated with the end surface 23 of the upper slinger 20.

In this state, as shown in FIG. 10, when the lowermost encoder 1 is pushed in the lateral direction by the pusher 50, the surface 11 of the magnetized elastic material 10 is rubbed against the end surface 23 of the slinger 20 and is damaged. There is a risk that the encoders 1 may not be separated properly and may be caught.
If the surface 11 of the magnetized elastic material 10 is damaged, it may lead to a signal failure of the encoder 1 and increase the failure rate in which rotation is not detected well in the output inspection of the encoder 1 in the subsequent process. If the separation between the two is not successful, the production line will stop.

Further, when the encoder 1 is incorporated and supplied as a pack seal 2, as shown in FIG. 11, in the state of being stacked in a rod shape for setting on the straight-cut type cutting and distributing device 60, as described above, The magnetized elastic material 10 is attracted to the surface 43 of the slinger 20 of the upper encoder 1 and the core metal 42 of the seal member 40, and is integrated in a wider area.
In this state, when the lowermost pack seal 2 is pushed laterally by the pusher 50, in addition to the above-described problem, the slinger 20 of the upper encoder 1 and the core metal 42 of the seal member 40 are magnetized and elastic. The surface 11 of the material 10 remains adsorbed and may be separated from the lowermost slinger 20 (see the lowermost pack seal 2 in FIG. 11). In such a case, since the encoder 1 becomes a defective product, the pack seal 2 must be discarded.

If the slinger 20 of the encoder 1 is formed of a nonmagnetic material, the above problem can be solved. However, austenitic stainless steel generally employed as the nonmagnetic material is expensive, and the slinger 20 of the encoder 1 is also expensive. However, the function of the back yoke cannot be performed, and the output of the encoder 1 is reduced.
With respect to the above-described problem, in Patent Document 1, a rubber protrusion is provided on the back side of the pack seal 2 on the seal side, and the encoder 1 and the slinger 20, 40 are sucked even when the pack seal 2 is stacked in a rod shape. Although the method of preventing is disclosed, the method of Patent Document 1 cannot be applied when the encoder is supplied alone.

JP 2001-141069 A

  An object of the present invention is to provide an encoder that can prevent separation of the stacked encoders even if they are single encoders and can be easily separated, and a pack seal incorporating the encoders.

In order to achieve the above-mentioned object, the technical means achieved by the present invention is a slinger that is integrally formed with an annular portion extending in the outer diameter direction from one end of a cylindrical portion and configured in an L-shape in cross-section. And an annular elastic material integrally provided on the outer surface of the annular portion of the slinger and magnetized in multiple poles, wherein a protrusion is provided beyond the inner diameter of the outer surface of the elastic material. It is that it was set as an encoder. The protrusion may be provided continuously or intermittently in the circumferential direction.
Further, a slinger configured to have an L-shaped cross-sectional view by integrally extending an annular portion extending in the outer diameter direction from one end of the annular portion, and integrally provided on the outer surface of the annular portion of the slinger, An encoder made of an elastic material magnetized on a pole, a core metal, and a seal member having a seal lip integrally provided on the core metal, the seal lip comprising A pack seal that forms one or a plurality of seal regions between the outer peripheral surface of the cylindrical portion of the encoder and one or both of the inner peripheral surfaces of the annular portion continuously extending from the outer peripheral surface of the cylindrical portion. In some cases, the pack seal is characterized in that a protrusion is provided from the inner diameter of the outer surface of the elastic material of the encoder. The protrusion may be provided continuously or intermittently in the circumferential direction. Further, the encoder or the pack seal described above may be provided in a double row bearing unit, and the double row bearing unit may be a hub unit bearing.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is an encoder single-piece | unit, the pack seal which incorporated the encoder which can prevent the adsorption | suction of the stacked encoder, and can isolate | separate easily can be provided.

Hereinafter, an encoder 1 according to an embodiment of the present invention and a pack seal 2 incorporating the encoder 1 will be described with reference to the accompanying drawings. The encoder 1 according to this embodiment and the pack seal 2 incorporating the encoder 1 are used by being provided in the axial direction on a double row hub unit bearing, and measure the rotational direction and the rotational speed of the rotating wheel.
The configuration of the double row hub unit bearing is the same as that of a conventional general hub unit bearing. For example, a fixed ring (for example, an outer ring) fixed to the vehicle body side, and an outer ring that can rotate relative to the outer ring. A rotating wheel (for example, an inner ring) that is provided facing the inside of the wheel and is connected (fixed) to the wheel side and rotates together with the wheel, and a plurality of rotatably incorporated in a double row (for example, two rows) between the inner and outer rings. The encoder 1 according to the present embodiment may be configured to include a rolling element, and the encoder 1 according to the present embodiment is fixed in the axial direction of the inner ring and rotates together with the inner ring. The rotation direction and the number of rotations of the rotating wheel are measured.
In the present embodiment, the magnetic material of the encoder 1 is made of a magnetic material that is magnetized so that different magnetic poles (N pole, S pole) are alternately arranged along the rotation direction of the inner ring 4. A multipole magnet encoder is used. The magnetic material of the encoder 1 is magnetized when the encoder is manufactured by a supplier, and is shipped as a magnetized encoder.

  As shown in FIG. 1 (a), the encoder 1 according to the present embodiment is integrally formed with an annular portion 22 that extends from one end 21a of the cylindrical portion 21 in the outer diameter direction (the direction indicated by the solid line arrow). A slinger 20 having an L-shape in cross-section and an annular elastic member 10 that is integrally vulcanized and formed on the outer surface of the annular portion 22 of the slinger 20 is magnetized in multiple poles. . At this time, the slinger 20 is made of a magnetic material and serves as a back yoke. In addition to controlling the output direction of the magnetic force of the encoder, the slinger 20 prevents the magnetic force from reaching the inside of the bearing.

Further, as a characteristic configuration of the present embodiment, a protrusion 30 is provided outward from the outer diameter of the elastic member 10 of the encoder 1 in the axial direction (in the direction of the broken arrow in the figure).
Further, as shown in FIG. 1B, the tip 31 of the protrusion 30 is formed to bend in the inner diameter direction (the direction of the solid line arrow in the figure), and when fitted into the rotating wheel, It is good also as a lip which functions as a seal | sticker between and prevents flooding.
When the encoder 1 is magnetized (magnetization of the elastic material 10), it is preferable that the encoder 1 is magnetized while avoiding the protrusion 30 of the elastic material 10.

As described above, the encoder 1 is shipped in a state of being stacked in a rod shape as shown in FIG. At this time, the protrusion 30 of the elastic material 10 of the encoder 1 is in contact with the end portion 23 of the slinger 20 of the upper encoder 1 at the tip portion 31, so that the end portion 23 of the slinger 20 and the elastic material 10 There is a gap G between the surface 11.
In the case where the encoders 1 stacked in a bar shape are set on the straight-cut type cut-and-distribution device 60, and separated and delivered one by one to a press-fitting device (not shown) that is press-fitted into the bearing, the encoder 1 is shown in FIG. In this way, the slider 51 and the push bar 52 may be pushed out by the pusher 50 formed integrally. In this case, when the pusher 50 slides in the lateral direction, the lowermost encoder 1 is separated and pushed out.

Specifically, the slider 51 is inserted between the protrusion 30 of the elastic material 10 and the slinger end portion 23 of the upper encoder 1 and supports the upper encoder 1, so that the lowermost encoder 1 and the upper encoder 1 are supported. 1 is separated. At the same time, the push bar 52 pushes the slinger 20 in the lateral direction, whereby the lowest encoder 1 is pushed out.
At this time, the slinger end portion 23 of the upper encoder 1 is supported by the slider 51 and is prevented from falling, so that it does not hit the elastic material surface 11 of the lowermost encoder 1, and the surface 11 of the elastic material 10 is not touched. It won't hurt.
Further, since no force pressed from above acts on the lowermost encoder 1, the push-out movement is performed smoothly, the encoder 1 is not caught, and the production line is not stopped.

In the present embodiment, as shown in FIG. 4, the encoder 1 described in the first embodiment is incorporated so as to face the seal member 40 to form the pack seal 2. Since the configuration of the encoder 1 is the same as that of the encoder 1 described in the first embodiment, it will not be described here.
The seal member 40 is integrally formed with a cored bar 42 that is integrally formed with an L-shaped cross-sectional view by extending an annular part 42 that extends in an inner diameter direction from one end 41 a of the cylindrical part 41. The seal member 40 is composed of an elastic material (for example, seal rubber) 44 having seal lips 45 and 46 provided. The seal lip (radial lips 45, 45 and axial lip 46) is a seal region between the outer peripheral surface of the cylindrical portion 41 of the encoder 1 and the outer peripheral surface of the cylindrical portion 41 and the inner peripheral surface of the annular portion 42. To prevent foreign matter and moisture from entering from the outside of the bearing. In this embodiment, radial lips 45 and 45 and an axial lip 46 are provided as an example of the configuration of the seal rubber 44, but the inner and outer surfaces of the bearing may be sealed with the inner peripheral surface 24 of the slinger 20 of the encoder 1. Any configuration may be used, and the configuration and material are not particularly limited.

When the pack seal 2 is shipped in the state of being stacked in a rod shape as shown in FIG. 5, the protrusion 30 of the elastic material 10 of the encoder 1 of the pack seal 2 is the tip end portion 31, and the slinger end of the upper encoder 1. Since it is in contact with the portion 23, there is a gap G between the surface 11 of the elastic material 10 and the slinger end portion 23 of the upper encoder 1 and the core metal surface 43 of the seal member 40.
When the pack seals 2 stacked in a bar shape in this way are set in the straight-cut type cut-and-distribution device 60, and separated and delivered one by one to a press-fitting device (not shown) that is press-fitted into the bearing, FIG. As shown, the pusher 50 in which the slider 51 and the push rod 52 are integrally formed slides in the horizontal direction, so that the lowermost encoder 1 is separated and pushed out.

  Specifically, the slider 51 is inserted between the surface 11 of the elastic material 10 and the core metal surface 43 of the seal member 40 of the upper pack seal 2 and supports the upper pack seal 2, thereby The pack seal 2 and the upper pack seal 2 are separated. At the same time, the push rod 52 pushes the lower pack seal 2 in the lateral direction, so that the protrusion 30 of the encoder 1 of the lower pack seal 2 can be easily moved from the slinger end 23 of the encoder 1 of the upper pack seal 2. The lowermost pack seal 2 is pushed away.

At this time, since the upper pack seal 2 is supported by the slider 51 and is prevented from dropping, the upper pack seal 2 does not hit the surface 11 of the elastic material 10 of the encoder 1 of the lowermost pack seal 2 and the surface 11 of the elastic material 10 is not touched. Since there is no damage and no pressing force is applied from above, the push-out movement is performed smoothly, the encoder 1 is not caught, and the production line is not stopped.
Furthermore, since there is a gap G between the surface 11 of the elastic material 10 and the slinger end 23 of the encoder 1 of the upper pack seal 2 and the core metal surface 43 of the seal member 40, the upper stage In other words, the surface 11 of the magnetized elastic material 10 does not remain attached to the slinger 20 of the encoder 1 and the core 42 of the seal member 40. Therefore, there is no possibility that the lowermost slinger 20 and the elastic material 10 are separated.

  In this embodiment, the pusher 50 of the rectilinear cutting / distribution device 60 is composed of the slider 51 and the push rod 52, but the slider 51 and the push rod 52 are separated as shown in FIG. It may be molded. In this case, the slider 51 and the push rod 52 can be controlled independently.

  In addition, the encoder 1 and the pack seal 2 in each of the above-described embodiments are used by being provided in a double row hub unit bearing. If it exists, it is applicable even if it is a bearing provided for other uses.

(A) is explanatory drawing which shows the encoder by 1st Example of this invention, (b) is explanatory drawing which shows the other example of an encoder. It is sectional drawing which shows the state in which the encoder by this invention is piled up in the rod shape. It is sectional drawing which shows the state which isolate | separates and pushes out the lowermost encoder stacked in the rod shape. It is explanatory drawing which shows the pack seal by 2nd Example of this invention. It is sectional drawing which shows the state in which the pack seal | sticker by 2nd Example is piled up in the rod shape. It is sectional drawing which shows the state which isolate | separates and extrudes the lowermost pack seal stacked | stacked on the rod shape. It is sectional drawing which shows the other example of the pusher which isolate | separates and pushes out the lowermost pack seal stacked | stacked on the rod shape. (A) is sectional drawing which shows the prior art example of an encoder, (b) is sectional drawing which shows the prior art example of a pack seal. It is sectional drawing which shows the state in which the conventional encoder was piled up in the rod shape. It is sectional drawing which shows the state which isolate | separates and pushes out the lowermost encoder of the conventional encoder stacked in the rod shape. It is sectional drawing which shows the state which isolate | separates and pushes out the lowermost pack seal of the conventional pack seal stacked in the rod shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Encoder 10 Encoder elastic material 11 Elastic material surface 23 Slinger end 30 Protrusion 31 Protrusion tip G Gap

Claims (6)

A ringer extending in the outer diameter direction from one end of the cylindrical part is integrally extended to form a slinger having an L-shaped cross-sectional view, and the slinger is integrally provided on the outer surface of the ring part. It consists of a magnetized annular elastic material,
An encoder characterized in that a protrusion is provided beyond the outer surface inner diameter of the elastic material.   The encoder according to claim 1, wherein the protrusion is provided continuously or intermittently in the circumferential direction. A slinger that is integrally formed on the outer surface of the ring portion of the slinger, which is integrally formed on the outer surface of the ring portion of the slinger. An encoder made of a magnetized elastic material;
It consists of a metal core and a sealing member composed of an elastic material having a seal lip provided integrally with the metal core,
One or a plurality of seal regions between the outer peripheral surface of the cylindrical portion of the encoder and one or both of the inner peripheral surfaces of the annular portion extending continuously from the outer peripheral surface of the cylindrical portion. A pack seal forming
A pack seal characterized in that a protrusion is provided on the outer surface inner diameter of the elastic material of the encoder.   The pack seal according to claim 3, wherein the protrusion is provided continuously or intermittently in the circumferential direction.   A double-row bearing unit comprising either the encoder according to claim 1 or claim 2 or the pack seal according to claim 2 or claim 4.   The double row bearing unit according to claim 5, wherein the double row bearing unit is a hub unit bearing.

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