JP4862685B2 - Deep groove ball bearing with encoder and wheel rotation speed detection device for motorcycle - Google Patents

Description

  A deep groove ball bearing with an encoder and a wheel speed detecting device for a motorcycle according to the present invention, for example, supports a wheel of a motorcycle such as a motorcycle or a scooter so as to be rotatable with respect to a frame. Used to find out.

An anti-lock brake system (ABS) is widely used as a device for stabilizing the running state for automobiles. Conventionally, such ABS has been widely used mainly for four-wheeled vehicles, but in recent years, it has begun to be adopted for motorcycles. As is well known, since it is necessary to determine the rotational speed of the wheel in order to control the ABS, it is possible to incorporate a rotational speed detection device into the wheel bearing ball bearing unit for rotatably supporting the wheel on the suspension device. It has been widely practiced. However, the structure of the rotational speed detection device for a four-wheeled vehicle cannot be directly applied to a motorcycle. There are two main reasons for this (1) and (2).
(1) The wheel support ball bearing unit for motorcycles is considerably smaller than the wheel support ball bearing unit for motorcycles.
(2) While many of the wheel support ball bearing units for four-wheeled vehicles are of the inner ring rotating type, many of the wheel support ball bearing units for motorcycles are of the outer ring rotating type.

  FIG. 11 shows a structure of a portion that rotatably supports the front wheels of a relatively small motorcycle such as a scooter as a first example of the structure of the wheel support portion of the motorcycle. In this structure, a pair of support plates 2 and 2 are fixed in parallel to each other at the lower ends of a pair of left and right forks 1 and 1 constituting the suspension device. The both ends of the support shaft 3 are supported and fixed between the support plates 2 and 2. Further, a pair of ball bearings 4 and 4 each having a single-row deep groove type are installed at two positions in the middle portion of the support shaft 3. Specifically, the inner rings constituting the both ball bearings 4 and 4 are fitted on the support shaft 3 and the axial positions of the inner rings are regulated by the inner ring spacers 5a, 5b and 5c. A cylindrical hub 6 is arranged around the support shaft 3 concentrically with the support shaft 3. And the outer ring | wheel which comprises the said both ball bearings 4 and 4 is internally fitted and fixed to the inner peripheral surface near both ends of the said hub 6. FIG. Further, a wheel 7 is supported and fixed to the outer peripheral surface of the hub 6.

  FIG. 12 shows a structure of a portion that rotatably supports the rear wheel of a relatively small motorcycle as a second example of the structure of the wheel support portion of the motorcycle. In this structure, both ends of the support shaft 3a are supported and fixed between a pair of arms 33 and 33 constituting the suspension device. Further, three ball bearings 4a to 4c, each of which is a single-row deep groove type, are installed at three positions of the intermediate portion of the support shaft 3a, and the wheel 7a is integrated with the wheel 7a around the support shaft 3a. The hub 6a is concentric with the support shaft 3a and is rotatable.

  On the other hand, a structure described in Patent Document 1 is conventionally known as a rotational speed detection device for obtaining the rotational speed of a wheel in order to incorporate ABS in a motorcycle. Although the structure described in Patent Document 1 is a rotational speed detection device for a motorcycle, it is intended to detect the rotational speed of a hub that constitutes a wheel support ball bearing unit of an inner ring rotation type. For this purpose, an encoder having an outer peripheral surface as a detection surface is fixed at an intermediate portion of the rotating shaft that rotates together with the wheel and between the pair of ball bearing units. Further, the detection part of the sensor supported on the non-rotating outer ring is placed in close proximity to the outer peripheral surface of the encoder. Such a structure can be applied to a relatively large motorcycle, but cannot be applied to a structure using a wheel support ball bearing unit of an outer ring rotating type, which is common in small motorcycles.

  On the other hand, in Patent Documents 2 and 3, an encoder is attached to a part of the seal ring that closes the end opening of the ball bearing unit, and the rotation speed of the rotating side race that constitutes the ball bearing unit can be measured. Is described. Of Patent Documents 2 and 3, Patent Document 2 describes an outer ring rotation type structure, and Patent Document 3 describes an inner ring rotation type structure. However, the wheel support ball bearing units with encoders described in Patent Documents 2 and 3 are all intended to detect the rotational speed of the wheels of a four-wheeled vehicle, and the ball bearing units are relatively It is large. For this reason, for example, even when the structure described in Patent Document 2 which is an outer ring rotating type is used when detecting the rotational speed of a wheel of a motorcycle, it is difficult to ensure the width dimension of the encoder in the radial direction. Problems such as difficulty in ensuring reliability with respect to speed detection occur.

  For example, in the case of a ball bearing with an encoder described in Patent Document 2, the rotational speed of the outer ring constituting the double row ball bearing unit, which gives a contact angle of the back combination type to each ball, is intended. is doing. For this reason, the encoder is fitted and fixed to the counter bore, which has the largest inner diameter among the outer rings, and the outer diameter of the encoder is increased to increase the width of the detected surface of the encoder in the radial direction. Easy to secure dimensions. On the other hand, in the case of a single row deep groove type ball bearing for supporting a motorcycle wheel, in addition to the small size of the ball bearing itself, the outer diameter of the inner ring at the axial end where the encoder should be mounted. Is the largest, and the inner diameter of the outer ring is the smallest. For this reason, the absolute value of the width dimension (relative to the radial direction) of the axial side surface which is the detection surface of the encoder is considerably reduced. As a result, the change in the output signal of the sensor having the detection unit opposed to the detected surface becomes small, which is disadvantageous in terms of ensuring the reliability of rotation speed detection. For example, Patent Document 3 describes a structure of a deep groove type ball bearing in which an encoder is attached to an end portion. Even if such a structure is applied to a ball bearing for supporting a wheel of a motorcycle, the encoder Therefore, it is difficult to ensure the reliability of rotation speed detection. In short, the structures described in Patent Documents 2 and 3 cannot be used as they are to detect the rotational speed of the wheels of the motorcycle.

JP-A-5-105158 JP 2005-121669 A JP 2005-233923 A

  In view of the circumstances as described above, the present invention was invented to realize a ball bearing with an encoder and a wheel rotation speed detecting device for a motorcycle that can detect the rotation speed of the wheel of the motorcycle with high reliability. is there.

The ball bearing with an encoder of the present invention includes an outer ring, an inner ring, a plurality of balls, an encoder, and a cored bar .
Of these, the outer ring has a deep groove type outer ring raceway on the inner peripheral surface, and rotates together with the wheels of the motorcycle when in use.
The inner ring has a deep groove type inner ring raceway on the outer peripheral surface, and does not rotate during use in a state of being fitted and fixed to a support shaft of a motorcycle.
The balls are provided between the inner ring raceway and the outer ring raceway so as to roll freely.
The encoder is in the shape of a ring and rotates together with the outer ring , and the magnetic characteristics of the outer surface in the axial direction, which is the side opposite to the ball, are alternately changed in the circumferential direction.
Further, the core metal is fitted and fixed to the inner peripheral surface of the end portion of the outer ring in a state where the encoder is coupled and fixed to the outer surface in the axial direction.
In particular, in the case of the present invention, regarding the ball bearing with encoder, the inner diameter is set to 12 to 25 mm and the outer diameter is set to 35 to 50 mm.
The encoder is made of a plastic magnet in which magnetic powder is hardened with a thermoplastic synthetic resin and is magnetized in the axial direction. By alternately changing the magnetization direction in the circumferential direction, S poles and N poles are alternately arranged on a certain axially outer side surface.
Moreover, the said metal core is comprised from the circular ring part and the cylindrical part bent toward the axial direction outer side from the outer periphery part of this circular ring part. The encoder is coupled and fixed to the axially outer side surface of the annular part, and the outer diameter side end part of the axially inner side surface of the annular part is formed on the axially outer end part of the outer ring. The cylindrical part is fitted and fixed to the inner peripheral surface side large diameter part in a state of being in contact with the step part existing in the back of the inner peripheral surface side large diameter part whose inner diameter is larger than the part adjacent to the inner side in the direction. ing.
Further, the detection surface of the encoder is externally fitted to the outer peripheral surface of the end portion of the inner ring so that the axially outer surface does not protrude outward in the axial direction from the axial end surface of the inner ring and the axial end surface of the outer ring. Covered by a fixed non-magnetic cover.

According to the present invention configured as described above, it is possible to realize a ball bearing with an encoder that can detect the rotational speed of a wheel of a motorcycle with high reliability. That is, in the case of the present invention, the encoder is installed by a deep groove type ball bearing in which the outer diameter of the end of the inner ring is larger than the outer diameter of the inner ring raceway and the inner diameter of the end of the outer ring is smaller than the inner diameter of the outer ring raceway. The width dimension in the radial direction of the portion to be increased can be increased. For this reason, the width of the encoder can be secured, the change in the output signal of the sensor can be increased, and the reliability of rotation speed detection can be secured. In the case of the present invention, the outer diameter side end portion of the inner side surface in the axial direction of the annular portion of the core metal is butted against the step portion existing in the inner diameter side of the outer ring on the inner diameter side. The axial position of the encoder can be regulated easily and reliably (with high accuracy). For this reason, the interval between the detection target surface of the encoder and the detection unit of the sensor is appropriately regulated, and the reliability of the rotational speed detection can be improved also from this surface. Furthermore, in the case of the present invention, the detection surface of the encoder is covered with a cover made of a nonmagnetic material, so that the encoder can be protected. Moreover, in the case of the present invention, even when the encoder is covered in this way, since the encoder is made of a plastic magnet, the amount of magnetic flux can be easily increased, and a change in the output signal of the sensor can be secured.

[First example of reference example related to the present invention ]
FIG. 1 shows a first example of a reference example related to the present invention . The ball bearing 8 with an encoder of the present reference example includes an outer ring 9, an inner ring 10, a plurality of balls 11, and a seal ring 12 with an encoder. The ball bearing 8 with an encoder 8 has an inner diameter R (of the inner ring 10) of about 12 to 25 mm, for example, and an outer diameter D (of the outer ring 9) of about 35 to 50 mm. In use, for example, as shown in FIG. 11 described above, the hub 6 is assembled between the outer peripheral surface of the support shaft 3 and the inner peripheral surface of the hub 6 so that the hub 6 can freely rotate around the support shaft 3. To support. When the present invention is applied to the structure of FIG. 11, only one of the pair of ball bearings 4 and 4 shown in FIG. The other ball bearing is a general ball bearing without an encoder.

As described above, for example, the outer ring 9 constituting the ball bearing with encoder 8 assembled between the outer peripheral surface of the support shaft 3 and the inner peripheral surface of the hub 6 has a single-row deep groove type on the inner peripheral surface. The outer ring raceway 13 is provided. The outer ring 9 rotates together with the hub 6 while being fitted and fixed to the hub 6 when used.
The inner ring 10 has a single row deep groove type inner ring raceway 14 on the outer peripheral surface. The inner ring 10 does not rotate while being fitted and fixed to the support shaft 3 during use.
Each ball 11 is provided between the outer ring raceway 13 and the inner ring raceway 14 so as to be freely rollable while being held by a cage 15.

The encoder-equipped seal ring 12 is formed by integrally connecting and fixing a metal core 16, an encoder 17 made of a permanent magnet, and an elastic seal material 18. Of these, the core 16 is made of a magnetic metal plate such as a steel plate, a ferritic or martensitic stainless steel plate, and the outer peripheral edge of the ring portion 19 is axially outward (opposite to the space where the balls 11 are installed). On the side, the cylindrical portion 20 is formed by being bent at a right angle toward the right side of FIG. 1 to form an annular shape with an L-shaped cross section.
The core metal 16 is not limited to the structure shown in FIG. 1, and includes a cylindrical portion 20 for fitting to the inner peripheral surface of the end portion of the outer ring 9 and an annular portion 19 for holding the encoder 17. Any structure may be used. For example, as shown in FIG. 13, the core metal 16 may be configured such that a locking portion 32 having a crank-shaped cross section is provided between the outer peripheral edge portion of the annular ring portion 19 and the cylindrical portion 20. When such a configuration is adopted, the cylindrical portion 20 and the inner peripheral surface of the end portion of the outer ring 9 are directly fitted (not via the encoder 17), and the locking portion 32 and the outer ring 9 are fitted. Since the position in the radial direction of the encoder 17 can be restricted between the inner circumferential surface and the inner circumferential surface, the detection accuracy relating to the rotation speed detection can be improved.

  On the other hand, the encoder 17 is formed by dispersing magnetic powder such as iron or ferrite in a polymer material such as elastomer such as rubber or plastomer such as synthetic resin. Such an encoder 17 is manufactured by injection molding in which the polymer material containing the magnetic powder is fed into a mold cavity. At the time of injection molding, the core metal 16 is set in the cavity. . In addition, an adhesive is applied in advance to the surface of the metal core 16 that contacts the encoder 17. Therefore, the encoder 17 and the core 16 are joined and fixed simultaneously with the injection molding of the encoder 17. The encoder 17 is magnetized in the axial direction, and the magnetization direction is changed alternately and at equal intervals in the circumferential direction. Accordingly, the south pole and the north pole are alternately arranged at equal intervals on the outer surface in the axial direction of the encoder 17, which is the detected surface. The number of these S poles and N poles is limited in design by the performance required for the ABS, etc., but at most 50 poles on the entire circumference of the encoder 17 (100 poles in total of S poles and N poles). )

  The elastic sealing material 18 protrudes inward in the radial direction from the inner peripheral edge of the core metal 16, and the base end portion (outer peripheral edge portion) is set to the inner peripheral edge portion of the core metal 16. It is fixed by attaching to. Such an elastic sealing material 18 is made by injection molding an elastomer such as rubber, and a pair of seal lips 21a and 21b are separated from each other in the axial direction on the inner peripheral edge portion, respectively. There is a resentment.

  Furthermore, an inner peripheral surface side large-diameter portion 24 having an inner diameter larger than that of the portion adjacent to the inner side in the axial direction is formed at the axially outer end portion of the inner peripheral surface of the outer ring 9. The seal ring 12 with an encoder as described above is formed by fitting the cylindrical portion 20 formed on the outer peripheral edge portion of the cored bar 16 into the inner peripheral surface side large-diameter portion 24 with an interference fit. It is fixed to the inner peripheral surface of the end. In this state, the sealing performance between the inner peripheral surface of the end portion of the outer ring 9 and the outer peripheral edge of the encoder-attached seal ring 12 is ensured. The tip edge of the inner seal lip 21a facing the inner space where the balls 11 are installed is formed on the outer peripheral surface of the end portion of the inner ring 10 over the entire circumference. A contact-type seal portion is formed by sliding on the inner wall of the concave groove 22 over the entire circumference. On the other hand, the leading edge of the outer seal lip 21b facing the outer space is closely opposed to the outer peripheral edge of the ridge 23 partitioning the outer side of the concave groove 22 over the entire circumference, and the portion is labyrinthed. Configure the seal.

  Further, in the state where the seal ring 12 with the encoder is fixed to the inner peripheral surface of the end portion of the outer ring 9 as described above, the outer surface in the axial direction of the encoder 17 is more axial than the end surfaces of the outer ring 9 and the inner ring 10. It exists at a position recessed inward. Therefore, before the encoder-equipped ball bearing 8 is assembled between the hub 6 and the support shaft 3, the encoder 17 is in contact with another object and damaged in the state of the ball bearing 8 with the encoder alone. Can be prevented. Of the openings at both ends of the internal space where the balls 11 are installed, the opening on the opposite side (left side in FIG. 1) from where the seal ring with encoder 12 is installed is an ordinary seal that does not include an encoder. It is blocked by a ring 25.

According to the ball bearing with an encoder of the present reference example configured as described above, for example, the rotational speed of a wheel of a motorcycle can be detected with high reliability. That is, in the case of this reference example, the encoder-attached seal ring 12 is fitted and fixed to the inner peripheral surface side large-diameter portion 24 formed at the axially outer end portion of the inner peripheral surface of the outer ring 9. For this reason, even in a structure in which the above-described seal ring 12 with an encoder is mounted on a deep groove type ball bearing in which the end portion of the outer ring does not have a portion with a large inner diameter such as a counterbore, the diameter of the seal ring 12 with an encoder is The width dimension in the direction can be increased. For this reason, the change in the output signal of the sensor in which the detection unit is opposed to the axial side surface which is the detection surface of the seal ring 12 with an encoder can be increased. That is, the magnetic flux entering and exiting from the outer surface in the axial direction of the encoder 17 constituting the encoder-attached seal ring 12 is increased, the degree to which the output signal of the sensor changes is increased, and the outer ring 9 is fitted and fixed. It becomes easy to ensure the reliability of detecting the rotational speed of the hub 6 and, in turn, the wheel connected and fixed to the hub 6.

  Further, the position of the seal ring with encoder 12 in the axial direction is such that the outer diameter side end of the inner surface in the axial direction of the annular portion 19 of the metal core 16 is located behind the large diameter portion 24 on the inner peripheral surface side. By abutting against the portion 26, it can be regulated easily and reliably (with high accuracy). For this reason, the seal ring with encoder 12 can be reliably prevented from interfering with the retainer 15, and the distance between the detected surface of the seal ring with encoder 12 and the detection portion of the sensor can be properly regulated. Also from this aspect, it is possible to improve the reliability of the rotational speed detection.

[Second example of reference example related to the present invention ]
FIG. 2 shows a second example of a reference example related to the present invention . In the case of this reference example, the outer peripheral surface of the outer end portion of the inner ring 10 a is a cylindrical surface 27. Then, the inner peripheral edge of the pair of seal lips 21 and 21 of the elastic seal material 18a attached to the inner peripheral edge of the seal ring with encoder 12a is brought into sliding contact with the cylindrical surface 27 portion. Since the configuration and operation of the other parts are the same as those in the first example of the reference example described above, the description of the equivalent parts is omitted.

[Third example of reference example related to the present invention ]
FIG. 3 shows a third example of the reference example related to the present invention . Also in the case of this reference example, the outer peripheral surface of the inner ring 10a is a cylindrical surface 27. In particular, in the case of the present reference example, no elastic sealing material is provided on the inner peripheral edge of the metal core 16 constituting the encoder-attached seal ring 12b, and the metal core 16 remains exposed. On the other hand, a seal ring 28 made of only an elastic material is fitted on the outer peripheral surface of the outer end portion of the inner ring 10 a, and the seal lip of the seal ring 28 is used in the axial direction of the annular portion 19 constituting the core metal 16. The outer surface is in sliding contact with the inner diameter side portion. A commercially available seal ring 28 can be used. Since the configuration and operation of the other parts are the same as those of the first example of the reference example described above, the description of the equivalent parts is omitted.

[Fourth Reference Example Related to the Present Invention ]
FIG. 4 shows a fourth example of the reference example related to the present invention . Also in this reference example, the outer circumferential surface of the outer end portion of the inner ring 10a is a cylindrical surface 27, and no elastic seal material is installed on the inner peripheral edge of the cored bar 16 constituting the seal ring with encoder 12c. The gold 16 is left exposed. On the other hand, on the outer peripheral surface of the outer end portion of the inner ring 10a, a slinger 29 having an L-shaped cross section and a ring shape as a whole is externally fixed by interference fitting by bending a metal plate. And this slinger 29, the said metal core 16, and the inner peripheral part of the encoder 17 adjoin and oppose, and the labyrinth seal is comprised in the said part. Since the configuration and operation of the other parts are the same as those of the first example of the reference example described above, the description of the equivalent parts is omitted.

[Example of Embodiment]
The sensed surface of the encoder (the axially outer side) and the detection unit of the sensor, without via the other member, it is preferable to directly closely opposed. This is because it is easy to improve the reliability of rotation speed detection by increasing the change in the magnetic characteristics at the detection unit of the sensor to increase the change in the output signal of the sensor. However, in order to protect the encoder, for example, as shown in FIG. 5 showing the embodiment of the present invention , the detection surface of the seal ring 12 with the encoder may be covered with a coating film 30 made of a nonmagnetic material. it can. Alternatively, the surface to be detected can be covered with a cover 31 made of a non-magnetic material that is supported and fixed to the inner ring 10a instead of omitting the coating film 30 or providing the coating film 30. When such a coating film 30 or cover 31 is provided, it is inevitable that the distance between the detected surface and the detection portion of the sensor becomes large. For this reason, in order to ensure the change of the output signal of this sensor, it is necessary to increase the amount of magnetic flux entering and exiting from the detected surface of the seal ring 12 with an encoder. In order to increase the amount of the magnetic flux, it is conceivable that the seal ring with encoder 12 is a plastic magnet in which magnetic powder is hardened with a thermoplastic synthetic resin. In the case of a plastic magnet, the amount of magnetic powder can be increased compared to the case of a rubber magnet, so that the amount of magnetic flux can be easily increased.

The deep groove type ball bearing with an encoder of the present invention is used to rotatably support a wheel of a motorcycle with respect to a frame and to determine the rotational speed of the wheel. When configuring the detection device, it is necessary to install a sensor for detecting the rotational speed close to the encoder. Although there is no particular limitation on the sensor installation structure in such a case, for example, as shown in FIGS. 6 to 10, a support plate 2 fixed to the lower ends of the forks 1 and 1 constituting the suspension device, 2 (see FIG. 11) or the support shaft 3 (3a) that is spanned between the distal ends of the arms 33 and 33 (see FIG. 12) and does not rotate may be supported.

[Fifth example of reference example related to the present invention]
First, in the case of the structure of the fifth example of the reference example related to the present invention shown in FIGS. 6 to 8, the encoder 17 incorporated in the ball bearing 8 with the encoder at the intermediate portion in the axial direction of the support shaft 3 (3 a). An annular holder 35 is externally fitted and fixed to a portion facing the detected surface (the outer surface in the axial direction). Of the holder 35, the sensor 34 is held and fixed in a holding recess 36 provided in a part of the circumferential direction on one side surface of the encoder 17 facing the detection surface. A spacer 39 is sandwiched between the holder 35 and the inner ring 10a of the encoder-equipped ball bearing 8 so that the distance between the detection surface of the encoder 17 and the detection portion of the sensor 34 is appropriate. ing. A through hole 37 for inserting a harness (not shown) for extracting an output signal of the sensor 34 is formed between the inner surface of the holding recess 36 and the other side of the holder 35. Further, a key 38 is spanned between the inner peripheral surface of the holder 35 and the outer peripheral surface of the support shaft 3 to prevent the holder 35 from rotating with respect to the support shaft 3. Further, a key 38 a is also spanned between the support shaft 3 and the support plate 2 (or the arm 33) to prevent the support shaft 3 from rotating with respect to the support plate 2. With these configurations, the rotation of the holder 35 is prevented, and the rotation speed of the encoder 17 can be accurately obtained by the sensor 34.

[Sixth and seventh reference examples related to the present invention]
Next, in the case of the structure of the sixth example of the reference example related to the present invention shown in FIG. 9, the portion near the inner diameter of the surface of the holder 35a facing the ball bearing with encoder 8 is the ball with encoder. It protrudes toward the bearing 8 and abuts against the inner ring 10a of the ball bearing 8 with an encoder. In addition, a disc spring 40 is provided between the holder 35a and the end face of the inner ring spacer 5c so that the positions of the detected surface of the encoder 17 and the detecting portion of the sensor 34 do not fluctuate.
Furthermore, in the case of the seventh example of the reference example related to the present invention shown in FIG. 10, an O-ring 41 is provided in place of the disc spring 40.
In any structure, the sensor 34 can be installed in a limited space, and the rotational speed of the motorcycle wheel can be stably measured.

The fragmentary sectional view which shows the 1st example of the reference example relevant to this invention. The fragmentary sectional view which shows the 2nd example. The fragmentary sectional view which shows the 3rd example. The fragmentary sectional view which shows the 4th example. The fragmentary sectional view which shows one example of embodiment of this invention . Sectional drawing of the sensor installation structure which can be implemented in combination with this invention which shows the 5th example of the reference example relevant to this invention. Sectional drawing which shows the rotation prevention structure of the holder with respect to a support shaft. Sectional drawing which shows the detent | locking structure of the support shaft with respect to a support plate. Sectional drawing of the sensor installation structure which can be implemented in combination with this invention which shows the 6th example of the reference example relevant to this invention. Sectional drawing which shows the 7th example . Sectional drawing which shows the 1st example of the rotation support part of the wheel of a motorcycle. Sectional drawing which shows the 2nd example. The figure equivalent to the A section of FIG. 1 which shows another example of the seal ring with an encoder used as the object of this invention.

DESCRIPTION OF SYMBOLS 1 Hawk 2 Support plate 3, 3a Support shaft 4, 4a, 4b, 4c Ball bearing 5a, 5b, 5c Inner ring spacer 6, 6a Hub 7, 7a Wheel 8 Ball bearing with encoder 9 Outer ring 10, 10a Inner ring 11 Ball 12, 12a, 12b, 12c Encoder seal ring 13 Outer ring raceway 14 Inner ring raceway 15 Cage 16 Core metal 17 Encoder 18, 18a Elastic seal material 19 Circular ring portion 20 Cylindrical portion 21, 21a, 21b Seal lip 22 Concave groove 23 Projection 24 Inner peripheral surface side large diameter portion 25 Seal ring 26 Step portion 27 Cylindrical surface 28 Seal ring 29 Slinger 30 Cover film 31 Cover 32 Locking portion 33 Arm 34 Sensor 35, 35a Holder 36 Holding recess 37 Through hole 38, 38a Key 39 Spacer 40 Plate spring 41 O-ring

Claims (7)

The outer ring has a deep groove type outer ring raceway on the inner peripheral surface, and the outer ring that rotates with the motorcycle wheel during use, and the outer ring has a deep groove type inner ring raceway, and is fitted and fixed to the support shaft of the motorcycle. An inner ring that does not rotate even when in use, a plurality of balls rotatably provided between the inner ring raceway and the outer ring raceway, and magnetic characteristics of the axially outer side surface that rotates together with the outer ring with respect to the circumferential direction. An annular encoder that is alternately changed, and a metal core that is fitted and fixed to the inner peripheral surface of the end portion of the outer ring in a state in which the encoder is coupled and fixed to the outer surface in the axial direction. Is a deep groove ball bearing with an encoder for a motorcycle, which is capable of measuring the rotational speed of the wheel , and the inner diameter of the deep groove ball bearing with an encoder for a motorcycle is 12 ~ 25mm and outer diameter The encoder is 35-50 mm, and the encoder is made of a plastic magnet obtained by solidifying magnetic powder with a thermoplastic synthetic resin, and is magnetized in the axial direction, and the magnetizing direction can be alternately changed with respect to the circumferential direction. The S pole and the N pole are alternately arranged on the outer surface in the axial direction, which is the detected surface, and the cored bar extends outwardly in the axial direction from the annular portion and the outer peripheral edge of the annular portion. And the encoder is coupled and fixed to the axially outer surface of the annular part, and the outer diameter side end of the axially inner side surface of the annular part is outside the axial direction of the outer ring. In the state where the cylindrical portion is abutted with the step portion existing at the back of the inner peripheral surface side large-diameter portion whose inner diameter is larger than the portion adjacent to the inner side in the axial direction formed at the end portion, The inner surface of the encoder is fixed to the outer peripheral surface of the inner ring. The axial outer side surface is covered with a cover made of a non-magnetic material that is externally fitted and fixed in a state that does not protrude axially outward from the axial end surface of the inner ring and the axial end surface of the outer ring. Deep groove ball bearings with encoders for motorcycles. 2. The motorcycle according to claim 1, wherein an opening on a side opposite to the position where the encoder and the metal core are installed is closed by a contact-type seal lip among both ends of the internal space where each ball is installed. Deep groove ball bearing with encoder. The deep groove ball bearing with an encoder for a motorcycle according to any one of claims 1 to 2, wherein a detection surface of the encoder is covered with a coating film made of a nonmagnetic material. A deep groove ball bearing with an encoder that rotatably supports a wheel around a support shaft of a motorcycle, and a sensor installed in a part of the support shaft that is axially separated from the deep groove ball bearing with an encoder; With
Of these, the deep groove ball bearing with encoder is the deep groove ball bearing with encoder described in any one of claims 1 to 3 ,
The sensor is held by an annular holder that is externally fitted and fixed to a part of the support shaft that is axially removed from the inner ring that forms the deep groove ball bearing with encoder.
Wheel speed detection device for motorcycles. The wheel rotational speed detection device for a motorcycle according to claim 4 , wherein the detection surface of the encoder and the detection portion of the sensor face each other in the axial direction. The wheel rotational speed detection device for a motorcycle according to any one of claims 4 to 5, wherein a spacer is sandwiched between the axial end surface of the inner ring and the axial end surface of the holder. 6. The motorcycle for a motorcycle according to claim 4 , wherein the inner ring and the holder are arranged adjacent to each other by directly contacting the axial end face of the inner ring and the axial end face of the holder. Wheel rotation speed detection device.

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