JP2017106479A - Sensor holder for bearing device, and the bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost by dispensing with mounting of an additional component for securing airtightness, more on an inner position from a sensor holder.SOLUTION: In a bearing device 11 including: a bearing having an inner ring 12, an outer ring 13 and a rolling element 14 rolling between an inner ring raceway surface 12A and an outer ring raceway surface 13A; a magnetic encoder 16 positioned on one end portion in an axial direction, of the bearing and fixed to the inner ring 12; a magnetic sensor 8 for detecting rotation of the magnetic encoder 16; and a sensor holder 1 fitted to the outer ring 13 and holding the magnetic sensor 8 on a prescribed position so as to be opposed to a magnetic pole of the magnetic encoder 16, the sensor holder 1 is constituted of a cup-shaped metallic body 1A, and a partitioning wall body 1B joined to an inner face side of the body 1A and made of synthetic rubber or synthetic resin. An insertion hole 2A for inserting the magnetic sensor 8, is formed on a bottom plate portion 2 of the body 1A, and the partitioning wall body 1B covers a cylindrical portion of the magnetic sensor 8 and the insertion hole 2A to hermetically seal the circumference of the insertion hole 2A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a holder for holding a magnetic sensor used in a bearing device in which a rolling bearing for supporting a wheel of an automobile is provided with a magnetic encoder and a magnetic sensor.

An anti-lock brake system that is widely used in automobiles and that effectively and safely brakes without locking the wheels detects, for example, the rotational speed of each wheel by a rotational speed detection device (wheel speed sensor), and is controlled by a control device. The acceleration and deceleration are calculated, the vehicle speed and the slip ratio are estimated, and the actuator is driven based on the results to control the brake fluid pressure.
A bearing device provided with such a rotational speed detection device in a rolling bearing (hub bearing) for supporting a wheel of an automobile is also widely used. For example, a magnetic encoder in which N poles and S poles are alternately arranged at regular intervals in the circumferential direction is attached to the inner ring of the bearing, and a cup-shaped metal sensor holder is press-fitted into the outer ring of the bearing. There is a bearing device in which a magnetic sensor, which is inserted through a provided insertion hole and detects the rotation of the magnetic encoder, is opposed to the magnetic encoder (for example, see Patent Documents 1 and 2).
The magnetic sensor is attached to the sensor holder using a nut fixed to a peripheral portion of an attachment hole provided in a bottom plate portion of the sensor holder. That is, by screwing the mounting bolt into the nut through the mounting hole, the mounting flange portion (mounting member) of the holder that holds the magnetic sensor is fixed to the sensor holder.

Japanese Patent No. 3636201 JP 2014-190463 A

Since the cup-shaped sensor holders (for example, the cover 23 of Patent Document 1 and the outer cap 16 of Patent Document 2) as in Patent Documents 1 and 2 are made of metal, at least a magnetic sensor is placed on the bottom plate portion of the sensor holder. It is necessary to open an insertion hole for insertion. Since the airtightness is lost by opening the insertion hole in the bottom plate portion in this way, water, muddy water or the like enters inward from the sensor holder in the bearing device.
Also, there is a minute gap between the outer ring of the bearing and the fitting part of the sensor holder that fits to the outer ring due to the minute scratches on the metal surface, distortion of the parts, etc. Therefore, water, muddy water, or the like may enter from the gap inward than the sensor holder in the bearing device.
Therefore, since it is necessary to attach another part for sealing the space between the inner and outer rings of the bearing to ensure airtightness at an inner position than the sensor holder in the bearing device (for example, seal rings 21 and 21a of Patent Document 1). In addition, the inner cap 15 of Patent Document 2) increases the manufacturing cost due to the increase in the number of parts.

  Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem of a sensor holder for a bearing device that can reduce the manufacturing cost by eliminating the need to attach a separate part for ensuring airtightness at the inner position of the sensor holder. Is to provide

In order to solve the above problems, a sensor holder for a bearing device according to the present invention includes an inner ring having an inner ring raceway surface formed on an outer peripheral surface, an outer ring having an outer ring raceway surface formed on an inner peripheral surface, and the inner ring raceway surface. And a bearing having a rolling element that rolls between the outer ring raceway surfaces, and N poles and S poles, which are positioned at one end of the bearing in the axial direction and fixed to the inner ring, are alternately arranged in the circumferential direction at regular intervals. A magnetic encoder for detecting the rotation of the magnetic encoder, and a sensor holder that is fitted to the outer ring and holds the magnetic sensor at a predetermined position so as to face the magnetic pole of the magnetic encoder. In the bearing device, a sensor holder comprising a cup-shaped metal main body and a synthetic rubber or synthetic resin partition wall joined to the inner surface side of the main body,
An insertion hole for inserting the magnetic sensor is provided in the bottom plate portion of the main body, and the partition wall body covers the cylindrical portion and the insertion hole of the magnetic sensor and seals the periphery of the insertion hole.

According to such a configuration, since the main body of the sensor holder is made of metal, it is superior in characteristics such as strength, durability, and chemical resistance as compared with those made of synthetic resin. A highly reliable state can be maintained.
Moreover, since the partition wall body joined to the inner surface side of the main body is made of synthetic rubber or synthetic resin, it can be easily formed into a desired arbitrary shape.
Furthermore, since the partition wall body is formed so as to cover the cylindrical portion of the magnetic sensor and the insertion hole and seal the periphery of the insertion hole, it is possible to prevent intrusion of water, muddy water, and the like from the insertion hole. Therefore, it is not necessary to attach a separate part to seal the space between the inner and outer rings of the bearing to ensure airtightness at the inner position of the sensor holder in the bearing device. Can be reduced.

Here, the bottom plate portion of the main body is provided with a mounting hole and a nut positioned on the inner surface side of the main body and fixed around the mounting hole, and the mounting flange of the support member that supports the magnetic sensor is passed through. The supporting member is fixed to the main body by screwing the mounting bolt through the hole and the mounting hole to the nut, so that the partition wall body covers the nut and the mounting hole and seals around the mounting hole. You may configure
According to such a structure, the supporting member that supports the magnetic sensor can be easily fixed to the main body of the sensor holder by passing the mounting bolt through the mounting hole and the mounting hole and screwing the mounting bolt into the nut.
In addition, in the configuration provided with such mounting holes and nuts, the partition wall body covers the nuts and mounting holes and seals the surroundings of the mounting holes, so that intrusion of water, muddy water, etc. from the mounting holes can be prevented.

Further, it is more preferable that a thickness of a portion of the partition wall body interposed between the magnetic encoder and the magnetic sensor is 0.3 mm or more and 2.0 mm or less.
According to such a configuration, by setting the thickness to 0.3 mm or more, it is possible to secure strength and chemical resistance that expresses airtightness, and by setting the thickness to 2.0 mm or less, the magnetic encoder and the magnetic resistance can be secured. The air gap of the sensor can be reduced. Thus, since the said thickness is thin and the said air gap can be shortened, the detection accuracy of a rotational speed detection apparatus can be improved.

Furthermore, a drainage hole is provided in the bottom plate portion of the main body, the partition wall body covers the drainage hole and seals around the drainage hole, and a groove-shaped or hole-shaped drainage channel formed in the partition wall body More preferably, it is connected to the drain hole.
According to such a configuration, since the partition wall body seals around the drain hole, it is possible to prevent intrusion of water, muddy water, and the like from the drain hole.
In addition, since the drainage channel formed in the partition wall is connected to the drainage hole, water or muddy water that entered the drainage channel is discharged from the drainage hole, so the partition wall made of synthetic rubber or synthetic resin It can suppress deterioration and damage of the body.

  A bearing device according to the present invention includes the sensor holder for the bearing device.

The bearing device sensor holder according to the present invention as described above has the following effects.
(1) Since the airtightness of the sensor holder is ensured by the partition wall body, it is not necessary to attach a separate part for securing the airtightness to the inner position of the sensor holder in the bearing device, thereby reducing the manufacturing cost. it can.
(2) In the case where the thickness of the part interposed between the magnetic encoder and the magnetic sensor in the partition wall body is 0.3 mm or more and 2.0 mm or less, the thickness is set to 0.3 mm or more so that airtightness is achieved. The strength and chemical resistance can be ensured, and the air gap between the magnetic encoder and the magnetic sensor can be reduced by setting the thickness to 2.0 mm or less. Thus, since the said thickness is thin and the said air gap can be shortened, the detection accuracy of a rotational speed detection apparatus can be improved.
(3) A drain hole is provided in the bottom plate portion of the main body, the partition wall body covers the drain hole and seals around the drain hole, and a groove-like or hole-like drainage channel formed in the partition wall body is connected to the drain hole. In such a case, since water, mud, or the like that has entered the drainage channel is discharged from the drainage hole, deterioration or damage to the partition wall body made of synthetic rubber or synthetic resin can be suppressed.

It is a fragmentary longitudinal cross-sectional view of the bearing apparatus provided with the sensor holder for bearing apparatuses which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional perspective view which shows the state which hold | maintained the magnetic sensor with the said sensor holder. It is the perspective view which looked at the sensor holder from the inner surface side. The partition wall body single-piece | unit is shown, (a) is a perspective view, (b) is a longitudinal cross-sectional perspective view. It is a fragmentary longitudinal cross-sectional view of the bearing apparatus provided with the sensor holder for bearing apparatuses which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional perspective view of the said sensor holder. The partition wall body single-piece | unit is shown, (a) is a perspective view, (b) is a longitudinal cross-sectional perspective view. It is a fragmentary longitudinal cross-sectional view of the bearing apparatus provided with the sensor holder for bearing apparatuses which concerns on Embodiment 3 of this invention. It is a longitudinal cross-sectional perspective view of the sensor holder for bearing apparatuses which concerns on Embodiment 3 of this invention. The partition wall body single-piece | unit is shown, (a) is a perspective view, (b) is a longitudinal cross-sectional perspective view.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. It is a waste.

Embodiment 1 FIG.
A bearing device 11 provided with the sensor holder 1 for a bearing device according to the first embodiment shown in the partial longitudinal sectional view of FIG. 1 is arranged in the axial direction of the bearing in addition to the bearing in which the inner ring 12 rotates with respect to the outer ring 13. The magnetic encoder 16, the sensor holder 1, the magnetic sensor 8, and a seal member 15 disposed at the other end in the axial direction of the bearing are provided at one end.
The bearing rolls between an inner ring 12 having an inner ring raceway surface 12A formed on the outer peripheral surface, an outer ring 13 having an outer ring raceway surface 13A formed on the inner peripheral surface, and between the inner ring raceway surface 12A and the outer ring raceway surface 13A. It has rolling elements 14, 14,.
The magnetic encoder 16 has N poles and S poles alternately arranged at regular intervals in the circumferential direction, and is fixed to the inner ring 12 by a support member 17 located at one end of the bearing in the axial direction.
The magnetic sensor 8 faces the magnetic encoder 16 and detects the rotation of the magnetic encoder 16, and is held by the sensor holder 1 while being positioned in the axial direction with respect to the sensor holder 1.

In the bearing device 11 shown in FIG. 1, the sensor holder 1 and the magnetic sensor 8 are axially connected to the magnetic encoder 16 by fitting the sensor holder 1 to the outer ring 13 of the bearing in which the magnetic encoder 16 is fixed to the inner ring 12. Therefore, the adjustment of the air gap of the magnetic sensor 8 with respect to the magnetic encoder 16 is completed.
Therefore, the complexity of the air gap adjustment work between the magnetic encoder 16 and the magnetic sensor 8 can be eliminated.

As shown in the partial longitudinal sectional view of FIG. 1, the longitudinal sectional perspective view of FIG. 2, and the perspective view of FIG. 3, the sensor holder 1 is joined to the cup-shaped metal main body 1A and the inner surface side of the main body 1A. The partition wall 1B is made of synthetic rubber or synthetic resin.
Since the main body 1A of the sensor holder 1 is made of metal, it is superior in characteristics such as strength, durability, and chemical resistance as compared with those made of synthetic resin. Can be maintained.
Moreover, the partition wall body 1B shown in the perspective view of FIG. 4A and the longitudinal sectional perspective view of FIG. 4B, which is joined to the inner surface side of the main body 1A, is made of synthetic rubber or synthetic resin. It is easy to form in a desired arbitrary shape, and is joined to the main body 1A by an adhesive and integrated with the main body 1A. The fixing of the partition wall body 1B to the main body 1A may be performed at the time of molding the partition wall body 1B or after molding.
Here, as the adhesive, a phenol adhesive, an acrylic adhesive, an epoxy adhesive, a silane coupling adhesive, a silicone adhesive, or the like can be used.

  Here, the main body 1A is made of metal such as stainless steel, cold rolled steel, aluminum alloy, or copper alloy, and is formed by press working. Since the main body 1A is not interposed between the magnetic encoder 16 and the magnetic sensor 8, it is not necessary to be made of non-magnetic steel such as stainless steel, and surface treatment for rust prevention such as cation electrodeposition coating or galvanization on the magnetic steel plate. It may be given.

As the synthetic rubber material forming the partition wall 1B, as a rubber material having good oil resistance, nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), acrylic rubber (ACM), ethylene / acrylic rubber (AEM), One or two or more kinds of rubbers such as fluoro rubber (FKM, FPM) and silicone rubber (VQM) can be appropriately blended and used. In consideration of kneadability of rubber material, vulcanization moldability, and adhesion to metal main body 1A, other types of rubber such as liquid NBR, ethylene propylene rubber (EPDM), natural rubber (NR), Blending with isoprene rubber (IR), styrene butadiene rubber (SBR), butadiene rubber (BR) or the like is also a preferred mode of use.
In addition, as a synthetic resin material forming the partition wall 1B, a thermoplastic resin such as polyamide (PA6, PA12, PA66, PA612, etc.) or polyphenylene sulfide (PPS), or a thermosetting resin such as phenol (PF) is used. What is contained can be used conveniently.

The main body 1A includes a bottom plate portion 2 that forms a cup-shaped bottom surface, a cylindrical portion 3 that forms part of a cup-shaped side surface, a flange portion 4, and the like. Therefore, the sensor holder 1 is positioned in the axial direction with respect to the bearing and the magnetic encoder 16 by fitting the cylindrical portion 3 of the main body 1 </ b> A to the outer ring 13 and stopping the flange portion 4.
Further, the bottom plate portion 2 of the main body 1 is formed with an insertion hole 2A for inserting the magnetic sensor 8 and an attachment hole 2B that is a through hole for attaching the attachment bolt 10, and an inner surface of a peripheral portion of the attachment hole 2B. The nut 6 is fixed to the side by welding or the like. Since the nut 6 is a stepped nut provided with an annular ridge that fits in the mounting hole 2B at the tip, positioning with respect to the mounting hole 2B is facilitated.
Support for supporting the magnetic sensor 8 by inserting the collar C into the through hole 9B of the mounting flange 9A of the support member 9 and screwing the mounting bolt 10 into the nut 6 through the collar C (through the through hole 9B and the mounting hole 2B). The member 9 is fixed to the main body 1A. Therefore, the magnetic sensor 8 inserted through the insertion hole 2 </ b> A is stably and reliably held by the sensor holder 1.

  The partition wall body 1B is formed in a shape that covers the cylindrical portion of the magnetic sensor 8 and the insertion hole 2A and seals the periphery of the insertion hole 2A, and covers the nut 6 and the mounting hole 2B to seal the periphery of the mounting hole 2B. Therefore, intrusion of water, muddy water, and the like from the insertion hole 2A and the attachment hole 2B can be prevented with the sensor holder 1 attached to the outer ring 13 of the bearing as shown in FIG. Therefore, since it is not necessary to attach a separate part for sealing the space between the inner and outer rings of the bearing to ensure airtightness at a position inward of the sensor holder 1 in the bearing device 11, it is manufactured by reducing the part cost and the assembly cost. Cost can be reduced.

In addition, the main body 1A is provided with a seal material 5 formed by applying, for example, an adhesive or a liquid gasket at a portion of the collar portion 4 that contacts the end face of the outer ring 13, so that the outer ring 13 of the bearing and Even when there is a minute gap between the fitting portion (cylindrical portion 3) of the sensor holder 1 fitted to the outer ring 13, the fitting portion of the outer ring 13 and the sensor holder 1 is sealed with the sealing material 5. it can. Therefore, intrusion of water, muddy water, and the like from the gap can be prevented.
Furthermore, the thickness T (see FIG. 2) of the part interposed between the magnetic encoder 16 and the magnetic sensor 8 in the partition wall 1B is set to 0.3 mm or more and 2.0 mm or less. By setting the thickness T to 0.3 mm or more, it is possible to ensure the strength and chemical resistance that expresses airtightness, and by reducing the thickness T to 2.0 mm or less, the air gap between the magnetic encoder 16 and the magnetic sensor 8 is reduced. be able to.
Thus, since the thickness T of the partition wall 1B interposed between the magnetic encoder 16 and the magnetic sensor 8 is thin (T ≦ 2 mm) and the air gap between the magnetic encoder 16 and the magnetic sensor 8 can be reduced, the rotational speed detection device Detection accuracy can be improved.

  In the above description, an example in which the partition wall body 1B is an integral part that seals around the insertion hole 2A and the attachment hole 2B has been shown. However, the partition wall body 1B is not an integral part, and each hole is individually formed. It is good also as another thing sealed.

Embodiment 2. FIG.
In the partial vertical sectional view of FIG. 5 and the vertical sectional perspective view of FIG. 6, the bearing device sensor holder 1 according to the second embodiment and the bearing device 11 including the sensor holder 1 are shown in FIG. The same reference numerals as those in FIG. 2 denote the same or corresponding parts, and detailed descriptions thereof will be omitted.

In the sensor holder 1 for bearing device according to the second embodiment, in addition to the insertion hole 2A and the mounting hole 2B, the drain hole 2C is formed in the lower end portion of the partition wall 1B in the bottom plate portion 2 of the cup-shaped metal main body 1A. Is formed.
Further, the synthetic rubber or synthetic resin partition wall 1B joined to the inner surface side of the main body 1A covers the drain hole 2C and seals around the drain hole 2C.
Therefore, since the partition wall body 1B seals around the drain hole 2C, it is possible to prevent intrusion of water, muddy water, and the like from the drain hole 2C into the bearing device 11.

Further, in the sensor holder 1 shown in FIGS. 5 and 6, a groove-like drainage channel 7A connected to the drainage hole 2C at the lower end of the partition wall 1B is formed so that water flows toward the drainage hole 2C. Is done.
Therefore, since water, muddy water, and the like that have entered the groove-like drainage channel 7A do not stay in the drainage channel 7A and are discharged from the drainage hole 2C by their own weight, the partition wall body made of synthetic rubber or synthetic resin Deterioration and damage of 1B can be suppressed.

  Here, the groove-shaped drainage channel 7A formed in the partition wall body 1B has a shape in which a portion in contact with the bottom plate portion 2 of the main body 1A is opened. According to the shape of the partition wall body 1B provided with such a groove-shaped drainage channel 7A, the single wall of the partition wall body 1B shown in the perspective view of FIG. 7A and the longitudinal sectional perspective view of FIG. Since the partition wall body 1B can be molded with an axial draw when it is molded and molded separately from the main body 1A, the mold structure is simplified.

Embodiment 3 FIG.
In the partial vertical sectional view of FIG. 8 and the vertical sectional perspective view of FIG. 9, the bearing device sensor holder 1 according to the third embodiment and the bearing device 11 including the sensor holder 1 are shown in FIG. The same reference numerals as those in FIG. 2 denote the same or corresponding parts, and detailed descriptions thereof will be omitted.

The sensor holder 1 for a bearing device according to the third embodiment includes a partition wall body in addition to the insertion hole 2A and the mounting hole 2B in the bottom plate portion 2 of the cup-shaped metal main body 1A as in the second embodiment. A drain hole 2D is formed at the lower end of 1B.
Moreover, the synthetic rubber or synthetic resin partition wall 1B joined to the inner surface side of the main body 1A covers the drain hole 2D and seals around the drain hole 2D.
Therefore, since the partition wall body 1B seals around the drain hole 2D, it is possible to prevent intrusion of water, muddy water, and the like from the drain hole 2D into the bearing device 11.

Further, in the sensor holder 1 of FIGS. 8 and 9, a hole-like drainage channel 7B connected to the drainage hole 2D at the lower end is formed in the partition wall body 1B so that water flows toward the drainage hole 2D. Is done.
Therefore, since water, muddy water, and the like that have entered the hole-like drainage channel 7B are discharged from the drainage hole 2D by their own weight without staying in the drainage channel 7B, the partition wall body made of synthetic rubber or synthetic resin Deterioration and damage of 1B can be suppressed.

Here, referring to FIG. 8 and FIG. 9 as well as the perspective view of FIG. 10 (a) showing the single body of the partition wall body 1B and the longitudinal sectional perspective view of FIG. 10 (b), the partition wall body 1B is formed. The shape of the hole-shaped drainage channel 7B will be described.
In the example of the present embodiment, the hole-shaped drainage channel 7B is linearly formed so as to be connected to the drainage hole 2D through the portion covering the cylindrical portion of the magnetic sensor 8 and the portion covering the tip of the nut 6 and the bolt 10. It is a round hole that extends.
However, the hole-shaped drainage channel 7B is not limited to a round hole, but may be a polygonal hole, and the diameter of the hole may change along the flow path. It may extend in a curved shape instead of a shape.

DESCRIPTION OF SYMBOLS 1 Sensor holder 1A Main body 1B Partition wall body 2 Bottom plate part 2A Insertion hole 2B Mounting hole 2C, 2D Drainage hole 3 Cylindrical part 4 Gutter part 5 Seal material 6 Nut 7A Groove-shaped drainage path 7B Hole-shaped drainage path 8 Magnetic sensor 9 Support member 9A Mounting flange 9B Through hole 10 Mounting bolt 11 Bearing device 12 Inner ring 12A Inner ring raceway surface 13 Outer ring 13A Outer ring drive surface 14 Rolling element 15 Seal member 16 Magnetic encoder 17 Mounting member C Color T Thickness

Claims (5)

An inner ring having an inner ring raceway surface formed on the outer peripheral surface, an outer ring having an outer ring raceway surface formed on the inner peripheral surface, and a bearing having a rolling element that rolls between the inner ring raceway surface and the outer ring raceway surface, the bearing A magnetic encoder that is fixed to the inner ring at one end in the axial direction and has N poles and S poles alternately arranged in the circumferential direction at regular intervals, a magnetic sensor for detecting the rotation of the magnetic encoder, and A bearing device including a sensor holder that is fitted to the outer ring and holds the magnetic sensor at a predetermined position so as to face the magnetic pole of the magnetic encoder;
A cup-shaped metal main body, and a sensor holder made of a synthetic rubber or synthetic resin partition wall joined to the inner surface side of the main body,
An insertion hole for inserting the magnetic sensor is provided in the bottom plate portion of the main body,
A sensor holder for a bearing device, wherein the partition wall body covers the cylindrical portion of the magnetic sensor and the insertion hole and seals around the insertion hole. In the bottom plate portion of the main body, provided with a mounting hole, and a nut fixed to the peripheral portion of the mounting hole, located on the inner surface side of the main body,
By fixing the support member to the body by threading the mounting bolt through the mounting hole and the mounting hole of the mounting flange of the support member that supports the magnetic sensor,
The sensor holder for a bearing device according to claim 1, wherein the partition wall body covers the nut and the mounting hole to seal around the mounting hole.   The sensor holder for a bearing device according to claim 1 or 2, wherein a thickness of a portion interposed between the magnetic encoder and the magnetic sensor in the partition wall body is 0.3 mm or more and 2.0 mm or less. A drain hole is provided in the bottom plate portion of the main body,
The partition wall body covers the drainage hole and seals the periphery of the drainage hole, and a groove-like or hole-like drainage channel formed in the partition wall is connected to the drainage hole. 2. A sensor holder for a bearing device according to claim 1.   The bearing apparatus provided with the sensor holder for bearing apparatuses of any one of Claims 1-4.

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