Patent Abstract:
A wheel speed detector for detecting a relative rotating speed between an outer ring and an inner ring by means of a magnetic sensor in association with a magnetic ring. A stationary seal member is fixed to the stationary ring and a rotatable seal member is fixed to the rotatable ring. The seal members engage to seal a gap between the inner ring and the outer ring. The magnetic sensor is fixed to a radial inner surface of the stationary seal member and the magnetic ring is fixed to a radial outer or a radial inner surface of the rotatable seal member and surfaces of the magnetic ring other than that fixed to the radial inner surface of the rotatable seal member are covered with a seal lip.

Full Description:
This application is a division of application Ser. No. 09/584,406, filed Jun. 1, 2000, now U.S. Pat. No. 6,605,938, the entire content of which is hereby incorporated by reference in this application. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a wheel speed detector that is intended to detect the rotating speed of a wheel and used for the antilock brake or the like of an automobile. 
     2. Discussion of Prior Art 
     Conventionally, as a wheel speed detector of this type, there has been provided a detector that is provided with a magnetic sensor fixed to the fixed side of an inner ring and an outer ring and a magnetic ring arranged on the rotating side so as to face this magnetic sensor and detects the rotating speed of the wheel by detecting a magnetic field varied in accordance with the rotation of this magnetic ring by means of the magnetic sensor. 
     The wheel speed detector of the above type has conventionally been arranged independently of a seal device for sealing a space between the inner ring and the outer ring with respect to the outside. This accordingly requires a special-purpose space and disadvantageously leads to a lack of compactness. The above arrangement also requires certain consideration for the dispositional relation of the detector relative to the other components that constitute the wheels and accordingly leads to the problem that the workability in the assembling stage is not good. 
     SUMMARY OF THE INVENTION 
     Accordingly, the object of the present invention is to provide a compact wheel speed detector capable of saving space around the wheels and improving the workability. 
     In order to achieve the object, there is provided a wheel speed detector for detecting a relative rotating speed between an outer ring and an inner ring by means of a magnetic sensor in association with an opposite magnetic ring, wherein one of the outer ring and the inner ring is rotatable while the other is stationary, the magnetic ring is fixed to the rotatable ring and the magnetic sensor is fixed to the stationary ring, 
     the magnetic ring and the magnetic sensor being integrated with a seal device for sealing a gap between the inner ring and the outer ring. 
     According to the present invention, the magnetic ring and the magnetic sensor are integrated with the seal device for sealing the gap between the inner ring and the outer ring. This arrangement can improve the compactness and the workability in the assembling stage. 
     In one embodiment of the present invention, the seal device has the magnetic ring and the magnetic sensor built-in. 
     According to the above construction, the seal device has the magnetic ring and the magnetic sensor built-in. This arrangement can enable the space saving around the wheels. 
     In one embodiment of the present invention, the magnetic ring is fixed to a rotatable member of the seal device for sealing the gap between the inner ring and the outer ring, and the magnetic sensor is fixed to a stationary member of the seal device. 
     According to the above construction, the magnetic ring and the magnetic sensor are integrated with the seal device by fixing the magnetic ring to the rotatable member of the seal device and fixing the magnetic sensor to the stationary member. This arrangement can enable the space saving around the wheels and improve the compactness and the workability in the assembling stage. 
     In one embodiment of the present invention, the magnetic ring and the magnetic sensor are arranged in a space where the rotatable member and the stationary member of the seal device face each other. 
     According to the above construction, the magnetic ring and the magnetic sensor are arranged in the space where the rotatable member and the stationary member of the seal device face each other. This arrangement can enable the space saving around the wheels and improve the compactness and the workability in the assembling stage. 
     In one embodiment of the present invention, a seal portion of the seal device is provided on both sides of the portion where the magnetic ring and the magnetic sensor face each other. 
     According to the above construction, the seal portion is provided on both sides of the oppositional portion where the magnetic ring and the magnetic sensor face each other. This can prevent water from intruding into the bearing inwardly of the magnetic sensor and prevent lubricant from leaking out of the bearing. 
     In one embodiment of the present invention, the magnetic ring and the magnetic sensor face each other obliquely with respect to the axis of rotation of the inner ring and the outer ring. 
     According to the above construction, the magnetic ring and the magnetic sensor, which face each other obliquely with respect to the axis of rotation of the inner ring and the outer ring, can be reduced in the radial dimension and compacted. 
     In one embodiment of the present invention, the stationary member of the seal device concurrently serves as a magnetic path of the magnetic sensor. 
     According to the above construction, the stationary member of the seal device concurrently serves as the magnetic path (yoke) of the magnetic sensor, and this can reduce the number of components for the achievement of compacting. 
     In one embodiment of the present invention, a seal portion constructed of a slinger and a seal lip to be brought in sliding contact with the slinger is provided axially outside the oppositional portion where the magnetic ring and the magnetic sensor face each other, and a main seal portion is provided between this seal portion and the oppositional portion. 
     According to the above construction, the additional seal portion constructed of the slinger and the axial seal lip is provided outside the main seal portion. This arrangement can improve the sealing performance and improve, in particular, the waterproof performance of the sensor portion. 
     In one embodiment of the present invention, the seal device is constructed of a rotatable member and a stationary member, 
     the magnetic sensor is fixed to the stationary member, the magnetic ring is fixed to the rotatable member, and the magnetic ring is covered with a nonmagnetic elastic member. 
     According to the above construction, the magnetic ring is covered with the nonmagnetic elastic member. This arrangement can prevent the magnetic foreign material such as iron powder from adhering to the magnetic ring and prevent the occurrence of noises. 
     In one embodiment of the present invention, the stationary member and the rotatable member constitute a labyrinth seal, and 
     the nonmagnetic elastic member is provided with an axial lip that extends in the axial direction and comes in sliding contact with the stationary member and a main lip that extends in the radial direction and comes in sliding contact with the stationary member. 
     According to the above construction, the labyrinth seal constructed of the stationary member and the rotatable member, the axial lip and the main lip can provide three-point sealing, and this can reliably prevent water from intruding into the bearing. 
     In one embodiment of the present invention, the nonmagnetic elastic member is provided with an auxiliary lip that comes in sliding contact with the stationary member inside the main lip. 
     According to the above construction, the auxiliary lip brought in sliding contact with the stationary member inside the main lip is provided, and this can further improve the waterproof performance. 
     In one embodiment of the present invention, the stationary member is made of austenite-based stainless steel, copper or aluminum. 
     According to the above construction, the stationary member for fixing the magnetic sensor is made magnetic with the material of austenite-based stainless steel, copper or aluminum. This arrangement can improve the magnetic detection accuracy of the magnetic sensor. 
     In one embodiment of the present invention, the seal device is constructed of a rotatable member and a stationary member, 
     an axial lip that extends axially outwardly of an axial outer surface of the rotatable member and comes in sliding contact with an axial inner surface of the stationary member is provided, 
     the magnetic ring is fixed to an axial inner surface of the rotatable member, and the magnetic sensor is fixed to an axial outer surface of the stationary member. 
     According to the above construction, the magnetic ring is fixed to the inner surface of the rotatable member, and the axial lip is fixed to the outer surface of the rotatable member. This arrangement can magnetize the magnetic ring from inside the rotatable member without being obstructed by the axial lip and facilitate the manufacturing. 
     In one embodiment of the present invention, the rotatable member is a magnetic body. 
     According to the above construction, the rotatable member to which the magnetic ring is fixed is magnetic, and this can increase the magnetic force of the magnetic ring. 
     In one embodiment of the present invention, the magnetic ring and the magnetic sensor face each other in the radial direction. 
     According to the above construction, the magnetic ring and the magnetic sensor face each other in the radial direction, and this can reduce the axial dimension and achieve compacting in the axial direction. 
     In one embodiment of the present invention, the seal device is constructed of a rotatable member and a stationary member, 
     the magnetic ring is fixed to the rotatable member, the magnetic sensor is fixed to the stationary member and there are provided 
     a main lip that is fixed to the rotatable member or the stationary member and seals a path between the rotatable member and the stationary member, a first auxiliary lip located inside the main lip, an axial lip located outside the main lip and a second auxiliary lip located outside the axial lip. 
     According to the above construction, the second auxiliary lip located outside the axial lip is provided in addition to the main lip, the first auxiliary lip and the axial lip, and this can improve the sealing performance. The second auxiliary lip prevents muddy water from directly splashing on the axial lip, and this can improve muddy water resistance. 
     In one embodiment of the present invention, the inner ring is rotatable, and 
     the second auxiliary lip is fixed to the rotatable member fixed to the inner ring and extends radially outwardly to seal a path between the rotatable member and the stationary member. 
     According to the above construction, the second auxiliary lip is fixed to the rotatable member fixed to the rotatable inner ring located, and therefore, a centrifugal force in the rotating stage presses the second auxiliary lip against the stationary member located radially outside. This arrangement can improve the sealing performance in the rotating stage. 
     In one embodiment of the present invention, a cover member for covering the magnetic sensor is provided, 
     the cover member has an inclined surface inclined relative to the axis of rotation of the outer ring and the inner ring and 
     a harness connected to the magnetic sensor is projecting from the inclined surface. 
     According to the above construction, the harness is made to project from the inclined surface of the cover member of the magnetic sensor, and this can widen the harness outlet width. 
     In one embodiment of the present invention, the seal device is constructed of a rotatable member and a stationary member, 
     a magnetic ring and a magnetic sensor are fixed to an axial oppositional portion where the rotatable member and the stationary member face each other, and 
     a cover member for covering the magnetic sensor has 
     one or more ring-shaped projections that form a labyrinth in a path that extends in the radial direction between the rotatable member and the stationary member. 
     According to the above construction, the cover member for covering the magnetic sensor fixed to the stationary member has the ring-shaped projection, and this ring-shaped projection forms the labyrinth in the path that extends in the radial direction between the stationary member and the rotatable member. This arrangement accordingly obviates the need for forming an axial lip for sealing the path in the radial direction on the rotatable member. Therefore, the axial lip does not become an obstacle in magnetizing the magnetic ring fixed to the radial portion of the rotatable member, allowing the manufacturing to be facilitated. 
     In one embodiment of the present invention, the seal device is constructed of a rotatable member and the stationary member, 
     the magnetic ring is fixed to the rotatable member, the magnetic sensor is fixed to the stationary member and 
     at least part of the magnetic sensor is arranged in a hole formed through the stationary member. 
     According to the above construction, at least part of the magnetic sensor is arranged in the hole formed in the stationary member. This arrangement can promote the space saving and provides excellent mountability in the case of a small space. 
     In one embodiment of the present invention, all seal lips are fixed to the stationary member to which the magnetic sensor is fixed. 
     According to the above construction, all the seal lips are fixed to the stationary member to which the magnetic sensor is fixed, and this simplifies the structure. 
     In one embodiment of the present invention, the stationary member has a removable cover metal fitting, and the magnetic sensor is mounted on the cover metal fitting. 
     According to the above construction, the magnetic sensor is mounted on the removable cover metal fitting, and this facilitates the replacement of the magnetic sensor. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein: 
         FIG. 1  is a sectional view of a wheel speed detector according to a first embodiment of the present invention; 
         FIG. 2  is a sectional view of a wheel speed detector according to a second embodiment of the present invention; 
         FIG. 3  is a sectional view of a modification example of the second embodiment; 
         FIG. 4  is a sectional view of a wheel speed detector according to a third embodiment of the present invention; 
         FIG. 5  is a sectional view of a wheel speed detector according to a fourth embodiment of the present invention; 
         FIG. 6  is a sectional view of a wheel speed detector according to a fifth embodiment of the present invention; 
         FIG. 7  is a sectional view showing the structure around the wheel speed detector of the fifth embodiment; 
         FIG. 8  is a sectional view of a wheel speed detector according to a sixth embodiment of the present invention; 
         FIG. 9  is a sectional view of a wheel speed detector according to a seventh embodiment of the present invention; 
         FIG. 10  is a sectional view of a wheel speed detector according to an eighth embodiment of the present invention; 
         FIG. 11  is a sectional view of a wheel speed detector according to a ninth embodiment of the present invention; 
         FIG. 12  is a sectional view of a wheel speed detector according to a tenth embodiment of the present invention; 
         FIG. 13  is a sectional view of a wheel speed detector according to an eleventh embodiment of the present invention; 
         FIG. 14  is a sectional view of a wheel speed detector according to a twelfth embodiment of the present invention; 
         FIG. 15  is a sectional view of a wheel speed detector according to a thirteenth embodiment of the present invention; 
         FIG. 16  is a sectional view of a wheel speed detector according to a fourteenth embodiment of the present invention; 
         FIG. 17  is a sectional view of a wheel speed detector according to a fifteenth embodiment of the present invention; 
         FIG. 18  is a sectional view of a wheel speed detector according to a sixteenth embodiment of the present invention; and 
         FIG. 19  is a sectional view of a modification example of the sixteenth embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention will be described in detail below on the basis of the embodiments thereof shown in the drawings. 
     First Embodiment 
       FIG. 1  shows the wheel speed detector of the first embodiment of the present invention. The wheel speed detector of the present first embodiment is integrated into a seal device  5  that seals a space between an inner ring  2  and an outer ring  3  of a ball bearing  1 . 
     The seal device  5  is provided with a core bar  6  fixed to an inner peripheral surface  3 A of the outer ring  3  located on the rotating side and a slinger  7  fixed to an outer peripheral surface  2 A of the inner ring  2  located on the stationary side. The core bar  6  has a cylindrical portion  6 A that is projecting in the axial direction from the outer ring  3  and a flange portion  6 B that extends from this cylindrical portion  6 A outwardly in the radial direction. The cylindrical portion  6 A is provided with a plurality of windows  8  at specified intervals in the circumferential direction, and a seal lip  10  made of a nonmagnetic elastic member is fixed to the flange portion  6 B. The cylindrical portion  6 A constitutes a magnetic ring  9  of the wheel speed detector. Further, the seal lip  10  has a main lip  10 A, an auxiliary lip  10 B and an axial lip  10 C. The seal lip  10  has a lid portion  10 D that closes the windows  8  of the cylindrical portion  6 A. 
     On the other hand, the slinger  7  is constructed of an inner cylindrical portion  7 A, an outer cylindrical portion  7 B and a disk portion  7 C that connects the inner cylindrical portion  7 A with the outer cylindrical portion  7 B. A magnetic sensor  11  is fixed to the inner peripheral surface of the inner cylindrical portion  7 A. This magnetic sensor  11  is constructed of a magnet  12 , a coil  13  and a yoke  15 . This magnetic sensor  11  faces from inside the cylindrical portion  6 A provided with the windows  8  that constitute the magnetic ring  9 . A signal line  16  is connected to this coil  13 . The signal line  16  is led outwardly in the axial direction through a cylindrical hole  17  formed in the disk portion  7 C of the slinger  7 . A cylindrical connector  18  is fit in the cylindrical hole  17  of the slinger  7 , and the signal line  16  passes through the approximate center of this connector  18 . 
     The disk portion  7 C of the slinger  7  faces the flange portion  6 B of the core bar  6 , and the main lip  10 A and the auxiliary lip  10 B fixed to this flange portion  6 B are brought in sliding contact with the disk portion  7 C. The axial lip  10 C is brought in sliding contact with the inner peripheral surface of the outer cylindrical portion  7 B of the slinger  7 . 
     The cylindrical portion  6 A of the core bar  6  that constitutes the magnetic ring  9  and the magnetic sensor  11  constitute the wheel speed detector of the present first embodiment. The magnetic sensor  11  is covered with a resin  14 . 
     In the wheel speed detector having the above construction, the core bar  6  that constitutes the magnetic ring  9  integrally with the outer ring  3  rotates when the outer ring  3  rotates relative to the inner ring  2 , and a change in magnetic field due to the rotation of this magnetic ring  9  is detected by the magnetic sensor  11 , and a signal that represents the rotating speed is taken out of the signal line  16 . On the other hand, the seal device  5  prevents water and dust from intruding into the bearing from the outside by means of the seal lip  10  fixed to the core bar  6  and prevents lubricant from leaking out of the bearing. 
     The wheel speed detector of the present first embodiment is integrated with the inside of the seal device  5 , and the magnetic ring  9  serves as part (core bar  6 ) of the seal device  5 . This arrangement can achieve the compacting and reduction in the number of components and improves the space saving and assembling workability. 
     Second Embodiment 
     Next,  FIG. 2  shows the wheel speed detector of the second embodiment of the present invention. The present second embodiment is integrated with the inside of a seal device  23  for sealing a space between an inner ring  21  and an outer ring  22  of the bearing. This seal device  23  has a sectionally L-figured ring-shaped rotating side member  25  fixed to the outer peripheral surface of the inner ring  21  and a ring-shaped stationary side member  26  fixed to the inner peripheral surface of the outer ring  22 . This stationary side member  26  is constructed of an outer cylindrical portion  26 A, an inner cylindrical portion  26 B and a disk portion  26 C extending between both the cylindrical portions. Then, a sectionally H-figured seal lip  27  having a two-layer structure is fixed to the leading end of a flange portion  25 A of the rotating side member  25 , and this seal lip  27  is brought in sliding contact with the inner peripheral surface of the outer cylindrical portion  26 A of the stationary side member  26 . On the other hand, a seal lip  28  is fixed to the leading end of a cylindrical portion  25 B of the rotating side member  25 . This seal lip  28  is brought in sliding contact with the outer peripheral surface of the inner cylindrical portion  26 B of the stationary side member  26 . 
     On the other hand, a magnetized pulser ring  30  that serves as a magnetic ring is fixed to the axial outer surface of the flange portion  25 A of the rotating side member  25 . A magnetic sensor  31  is fixed to the inner surface of the disk portion  26 C of the stationary side member  26  and axially faces the magnetized pulser ring  30 . This magnetized pulser ring  30  is formed of a material obtained by mixing magnetic powder with a rubber or resin and is magnetized so that a north pole and a south pole are alternately arranged in the circumferential direction. On the other hand, the magnetic sensor  31  is constructed of a semiconductor circuit, and this magnetic sensor  31  is fit in a space between the outer cylindrical portion  26 A and the inner cylindrical portion  26 B of the stationary side member  26  and covered with a resin  32 . A signal line  33  from the magnetic sensor  31  is led axially outwardly through a hole  34  formed in the disk portion  26 C of the stationary side member  26  and arranged inside a cylindrical connector  37  mounted on an edge  35  of the hole  34  via an O-ring  36 . 
     The magnetized pulser ring  30  and the magnetic sensor  31  constitute the wheel speed detector of the present embodiment. Even in the present embodiment, the magnetized pulser ring  30  and the magnetic sensor  31  are integrated with the inside of the seal device  23 . This arrangement enables the compacting and space saving and improves the assembling workability. Furthermore, a seal portion is constructed of the seal lips  27  and  28  on both sides of a portion where the magnetized pulser ring  30  and the magnetic sensor  31  face each other. This arrangement can prevent water from entering inwardly of the magnetic sensor  31  and prevent the lubricant from leaking out of the bearing. 
     In the second embodiment, the magnetized pulser ring  30  and the magnetic sensor  31  are made to face each other in the axial direction. However, as shown in  FIG. 3 , it is acceptable to fix a magnetic sensor  42  to the inner peripheral surface of a cylindrical portion  43 A elongated in the axial direction of a stationary side member  43 , fix a magnetized pulser ring  41  to the outer peripheral surface of a cylindrical portion  45 A elongated in the axial direction of a rotating side member  45  and make the magnetized pulser ring  41  and the magnetic sensor  42  face each other in the radial direction. Although the magnetized pulser ring is made to face the very front of the magnetic sensor in the second embodiment and the embodiments described below, the magnetized pulser ring and the magnetic sensor may be made to obliquely face each other. There may be an arrangement such that the magnetized pulser ring and the magnetic sensor are relatively displaced from the face-to-face positions to the mutually displaced positions along the plane of opposition. It was confirmed that the magnetic sensor was able to detect a magnetic change due to the rotation of the magnetized pulser ring even in the obliquely displaced positions or the mutually displaced positions as described above. 
     Third Embodiment 
     Next,  FIG. 4  shows the wheel speed detector of the third embodiment of the present invention. The present third embodiment is integrated with the inside of a seal device  53  arranged between an inner ring  51  and an outer ring  52 . The inner ring  51  is mounted around an inner cylinder  50 . Then, balls  54  are arranged between the inner ring  51  and the outer ring  52 , while balls  59  are arranged between the inner cylinder  50  and the outer ring  52 . 
     The seal device  53  is provided with a rotating side annular member  55  fixed to the outer peripheral surface of the inner ring  51  located on the rotating side and a stationary side annular member  57  fixed to the inner peripheral surface of the outer ring  52  located on the stationary side. The rotating side annular member  55  has a sectionally roughly V-figured shape and includes an axial cylindrical portion  55 A and an inclined flange  55 B. The stationary side annular member  57  has an axial cylindrical portion  57 A and inner flanges  57 B and  57 C located on both ends of the axial cylindrical portion  57 A. A seal lip  58  is fixed to this inner flange  57 C, and this seal lip  58  has an axial lip  58 A brought in sliding contact with the inner peripheral surface of the inclined flange  55 B of the rotating side annular member  55 , a main lip  58 B brought in sliding contact with the axial cylindrical portion  55 A of the rotating side annular member  55  and an auxiliary lip  58 C. 
     A base portion  60 A of a wire harness  60  is fixed from the inner flange  57 B of the stationary side annular member  57  to the axial cylindrical portion  57 A. In this base portion  60 A is a resin-molded outer seal lip  61  whose main lip  61 A and auxiliary lip  61 B are brought in sliding contact with the outer peripheral surface of the inner ring  51 . This base portion  60 A has an inclined surface  62  that faces the inclined flange  55 B of the rotating side annular member  55  at a specified interval, and a magnetic sensor  63  is buried in this inclined surface  62 . This magnetic sensor  63  is constructed of a semiconductor circuit and is connected to a signal processing circuit  65 . A magnetized pulser ring  66  that faces this magnetic sensor  63  and serves as a magnetic ring is fixed to the inclined flange  55 B. This magnetized pulser ring  66  uses a material obtained by mixing magnetic powder with a rubber or resin and magnetized so that a north pole and a south pole are alternately arranged in the circumferential direction. 
     The wheel speed detector constructed of the magnetic sensor  63  and the magnetized pulser ring  66  is integrated with the inside of the seal device  53 , and therefore, the detector is compact and has good assembling workability. The magnetic sensor  63  and the magnetized pulser ring  66  face each other obliquely with respect to the relative axis of rotation of the inner ring  51  and the outer ring  52 , and therefore, the radial dimensions can be reduced, allowing the compacting to be promoted. 
     Fourth Embodiment 
     Next,  FIG. 5  shows the wheel speed detector of the fourth embodiment of the present invention. This fourth embodiment is integrated with a seal device  73  arranged between an inner ring  71  and an outer ring  72 . It is to be noted that the inner ring  71  is mounted around a shaft  74 . Balls  79  are arranged in a space between this shaft  74  and the outer ring  72 , while balls  70  are arranged in a space between the inner ring  71  and the outer ring  72 . 
     This seal device  73  is constructed of a sectionally bracket-shaped rotating side annular member  76  fixed to the outer peripheral surface of the inner ring  71  and a sectionally bracket-shaped stationary side annular member  78  fixed to the inner peripheral surface of the outer ring  72 . This stationary side annular member  78  is put inside the rotating side annular member  76  with interposition of a specified gap. Seal lips  80  and  81  are fixed to the radial inner ends  78 A and  78 B of the stationary side annular member  78 , and the seal lips  80  and  81  are brought in sliding contact with the cylindrical peripheral surface and the disk-shaped peripheral surface, respectively, of the rotating side annular member  76 . 
     A plurality of windows  82  are formed at specified intervals in the circumferential direction in the cylindrical portion of the rotating side annular member  76 , forming a magnetic ring  83 . A magnet  85  and a coil  86  are fixed to the inside of the stationary side annular member  78 , forming a magnetic sensor  87 . This stationary side annular member  78  is made of a magnetic material and plays the role of a yoke (magnetic path) of the magnetic sensor  87 . 
     The wheel speed detector of the present fourth embodiment, in which the magnetic ring  83  is constructed of the rotating side annular member  76  of the seal device  73  and the stationary side annular member  78  of the seal device  73  concurrently serves as the yoke (magnetic path) of the magnetic sensor  87 , can be reduced in the number of components, allowing the compacting to be further promoted. 
     Fifth Embodiment 
     Next,  FIG. 6  shows the wheel speed detector of the fifth embodiment of the present invention. The present fifth embodiment is integrated with a seal device  93  arranged between an inner ring  91  and an outer ring  92 . It is to be noted that the inner ring  91  is arranged adjacently in two lines in the axial direction as shown in  FIG. 7  where balls  94  are arranged between the inner ring  91  and the outer ring  92 . A seal device  99  having a structure similar to that of the seal device  93  is arranged axially on the opposite side of the seal device  93 . 
     The seal device  93  is provided with a sectionally L-figured annular slinger  95  fixed to the outer peripheral surface of the inner ring  91  and another sectionally L-figured annular slinger  96  fixed to the axial inside portion  95 A of this slinger  95 . These two slingers  95  and  96  constitute a rotating side member  97 . The seal device  93  has an annular core bar  98  that serves as a stationary side member fixed to the inner peripheral surface of the outer ring  92 . This annular core bar  98  is constructed of a bent portion  100  that is projecting outwardly in the axial direction and a projecting portion  101  that is projecting inwardly in the radial direction. A resin portion  102  that fills the inside of this bent portion  100  and forms a resin portion  102  along the projecting portion  101 , and a magnetic sensor  103  is molded in this resin portion  102 . A signal line  104  is connected to this magnetic sensor  103 , and this signal line  104  is connected to a harness  109  fixed to the outer peripheral surface of the bent portion  100  of the core bar  98 . 
     Then, a magnetic ring  105  is fixed to a radial portion  96 A of the slinger  96  so as to face this magnetic sensor  103 . On the other hand, a seal lip  106  is fixed to the projecting portion  101  of the core bar  98 . This seal lip  106  has a main lip  106 A and an auxiliary lip  106 B located axially inside this main lip  106 A. This main lip  106 A and the auxiliary lip  106 B are brought in sliding contact with the axial portion  95 A of the slinger  95 . 
     Further, the seal lip  106  is provided with an axial lip  106 C that extends obliquely in the axial direction radially outwardly of the main lip  106 A. This axial lip  106 C obliquely extends outwardly in the axial direction and outwardly in the radial direction and is brought in sliding contact with a radial portion  95 B of the slinger  95 . 
     In the wheel speed detector of the present fifth embodiment, the magnetic ring  105  and the magnetic sensor  103  are integrated with the inside of the seal device  93 . This arrangement enables the compacting and space saving and improves the assembling workability. Furthermore, the waterproof performance can be improved since the slingers  95  and  96  and the core bar  98  constitute the labyrinth structure and the seal lip  106  extending from the core bar  98  is brought in sliding contact with the slinger  95  by the three lips of the main lip  106 A, the auxiliary lip  106 B and the axial lip  106 C. 
     Sixth Embodiment 
     Next,  FIG. 8  shows the wheel speed detector of the sixth embodiment of the present invention. The present sixth embodiment is integrated with a seal device  113  arranged between an inner ring  111  and an outer ring  112 . This seal device  113  is provided with a sectionally roughly inverted L-figured core bar  115  fixed to the inner peripheral surface of the outer ring  112  located on the rotating side and a sectionally roughly L-figured slinger  116  fixed to the inner ring  111  located on the stationary side. The core bar  115  and the slinger  116  have oppositional portions  115 A and  116 A that face each other in the axial direction. A magnetized pulser ring  117  that serves as a magnetic ring is fixed to the oppositional portion  115 A of this core bar  115 . A seal lip  118  constructed of a nonmagnetic elastic member is fixed to the oppositional portion  115 A of this core bar  115  so as to cover the magnetized pulser ring  117 . This seal lip  118  is provided with an auxiliary lip  118 A, a main lip  118 B and an axial lip  118 C. The auxiliary lip  118 A and the main lip  118 B are brought in sliding contact with a cylindrical portion  116 B of the slinger  116 , and the axial lip  118 C is brought in sliding contact with the oppositional portion  116 A of the slinger  116 . This axial lip  118 C extends outwardly in the axial direction and outwardly in the radial direction from the root portion to the leading end portion. 
     On the other hand, a magnetic sensor  120  is fixed to the outer surface of the oppositional portion  116 A of the slinger  116 . This magnetic sensor  120  is covered with a resin mold that constitutes a mold portion  121 . This mold portion  121  forms a labyrinth  122  oppositional to an axial end surface  115 C of the core bar  115  and an axial end surface  112 A of the outer ring  112 . The mold portion  121  has an inclined surface  121 A that inclines relative to a plane perpendicular to the axis of the rotary shaft, and this inclined surface  121 A serves as a surface for leading a signal line  123  from the magnetic sensor  120 . This inclined surface  121 A is upslope from the outside toward the inside in the axial direction. 
     In the present sixth embodiment, the magnetized pulser ring  117  is covered with the seal lip  118  constructed of the nonmagnetic elastic member, and accordingly, there is formed no such bridge that might connect the south pole with the adjacent north pole due to the adhesion of iron powder or the like to the magnetized pulser ring  117 . Therefore, the magnetic noise can be reduced and the rotating speed detection accuracy can be improved. Further, in this sixth embodiment, a labyrinth  122  is formed of a mold portion  121  in addition to the three lips  118 A,  118 B and  118 C owned by the seal lip  118 , and therefore, the waterproof performance can be improved. Further, in the present sixth embodiment, the slinger  116  for fixing the magnetic sensor  120  is made nonmagnetic with a material of austenite-based stainless steel, and therefore, the magnetic detection accuracy of the magnetic sensor  120  can be improved. Further, in the present sixth embodiment, a signal line  123  can be led out of the inclined surface  121 A owned by the mold portion  121 . 
     Seventh Embodiment 
     Next,  FIG. 9  shows the wheel speed detector of the seventh embodiment of the present invention. The present seventh embodiment differs from the sixth embodiment shown in  FIG. 8  in that the magnetized pulser ring  117  is fixed to an inner surface  115 A- 1  of the oppositional portion  115 A of the core bar  115 . In the present sixth embodiment, the magnetized pulser ring  117  is fixed to the inner surface  115 A- 1  of the oppositional portion  115 A of the core bar  115 . With this arrangement, the pulser ring  117  that is made of a material obtained by mixing magnetic powder with a rubber or resin and put in a non-magnetized state can be magnetized axially from inside. Therefore, the axial lip  118 C does not become an obstacle during the magnetization. 
     In the present seventh embodiment, the core bar  115  is made of a magnetic material, and therefore, the magnetic force of the pulser ring  117  can be increased. 
     Eighth Embodiment 
     Next,  FIG. 10  shows the wheel speed detector of the eighth embodiment of the present invention. The present eighth embodiment is integrated with a seal device  133  arranged between an inner ring  131  and an outer ring  132 . This seal device  133  is provided with a core bar  135  that serves as a stationary side member and is fixed to the inner peripheral surface of the outer ring  132  located on the stationary side and a slinger  136  that serves as a rotating side member and is fixed to the outer peripheral surface of the inner ring  131  located on the rotating side. 
     The core bar  135  is provided with a cylindrical portion  135 A, an outer flange  135 B and an inner flange  135 C that extend in the radial direction from both axial ends of this cylindrical portion  135 A. A seal lip  137  having a main lip  137 A and a first auxiliary lip  137 B is fixed to the leading end of this inner flange  135 C. On the other hand, the slinger  136  is constructed of a disk portion  136 A and an outer cylindrical portion  136 B and an inner cylindrical portion  136 C that extend axially inwardly from both radial ends of this disk portion  136 A. The main lip  137 A and the first auxiliary lip  137 B of the seal lip  137  are brought in sliding contact with the inner cylindrical portion  136 C of this slinger  136 . A seal lip  138  is fixed to the outer cylindrical portion  136 B of the slinger  136 . This seal lip  138  has an axial lip  140  brought in sliding contact with the inner flange  135 C of the core bar  135  and a fourth lip  141  located axially outside this axial lip  140 . This seal lip  138  covers a magnetized pulser ring  142  fixed to the inner surface of the outer cylindrical portion  136 B of the slinger  136 . 
     On the other hand, a magnetic sensor  143  is fixed to the cylindrical portion  135 A of the core bar  135 , and this magnetic sensor  143  is buried in a resin portion  145  that serves as a cover member. A fourth lip  141  of the seal lip  138  is brought in sliding contact with this resin portion  145 . The resin portion  145  has an axial end portion  145 A that closely fit to the outer flange  135 B of the core bar  135 , and this axial end portion  145 A has an inclined surface  146  that is inclined relative to the axis of rotation. This inclined surface  146  is upslope from the outside toward the inside in the axial direction, and a harness  147  is projecting from this inclined surface  146 . This harness  147  is connected to a signal line  148  extending from the magnetic sensor  143 . 
     In the wheel speed detector of the present eighth embodiment, a magnetized pulser ring  142  and a magnetic sensor  143  face each other in the radial direction, and therefore, the axial dimensions can be reduced to enable the compacting in the axial dimension. Further, the present eighth embodiment is provided with a second auxiliary lip  141  located outside the axial lip  140  in addition to the main lip  137 A, the auxiliary lip  137 B and the axial lip  140 , and therefore, the sealing performance can be improved. In particular, the second auxiliary lip  141  prevents muddy water from directly splashing on the axial lip  140 , and therefore, an improved muddy water resistance can be achieved. Further, in the present eighth embodiment, the second auxiliary lip  141  is fixed to the slinger  136  fixed to the inner ring  131  located on the rotating side, and therefore, a centrifugal force in the rotating stage presses the second auxiliary lip  141  against the core bar  135  (cylindrical inner peripheral surface  144  of the resin portion  145 ) located radially outside. Therefore, the sealing performance during rotation can be improved. In the present eighth embodiment, the harness  147  is projecting from the inclined surface  146  of the resin portion  145  that covers the magnetic sensor  143 , and therefore, the harness outlet width can be widened. In the present eighth embodiment, the magnetized pulser ring  142  is completely covered with the seal lip  138  and placed inside the seal portion constructed of the seal lip  137  and the seal lip  138 . This removes the concern about the adhesion of a magnetic foreign material to the magnetized pulser ring  142  and restrains the occurrence of noises, thereby allowing a correct speed detection to be achieved. 
     Ninth Embodiment 
     Next,  FIG. 11  shows the wheel speed detector of the ninth embodiment of the present invention. The present ninth embodiment is integrated with a seal device  153  arranged between an inner ring  151  and an outer ring  152 . This seal device  153  is provided with a sectionally roughly inverted L-figured core bar  155  fixed to the inner peripheral surface of the outer ring  152  located on the rotating side and a sectionally reversed L-figured slinger  156  fixed to the inner ring  151  located on the stationary side. The core bar  155  and the slinger  156  have respective oppositional portions  155 A and  156 A that face each other in the axial direction. A magnetized pulser ring  157  that serves as a magnetic ring is fixed to the oppositional portion  155 A of this core bar  155 . A seal lip  158  constructed of a nonmagnetic elastic member is fixed to the oppositional portion  155 A of this core bar  115  so as to cover the magnetized pulser ring  157 . This seal lip  158  has a main lip  158 A and an auxiliary lip  158 B that are brought in sliding contact with a cylindrical portion  156 B of the slinger  156 . 
     On the other hand, a magnetic sensor  160  is fixed to the inner surface of the oppositional portion  156 A of the slinger  156 , and this magnetic sensor  160  is completely covered with a resin portion  161  in which the slinger  156  is molded. This resin portion  161  has an annular inner diameter side projection  162  and an annular outer diameter side projection  163  that are projecting axially inwardly from the front surface of the magnetic sensor  160  toward the magnetized pulser ring  157 . The projection  162  and the projection  163  constitute a labyrinth  165  between the projections and a thin portion  158 C of the seal lip  158  that covers the magnetized pulser ring  157 . 
     According to the present ninth embodiment, the resin portion  161  that covers the magnetic sensor  160  fixed to the slinger  156  has ring-shaped projections  162  and  163 , and these ring-shaped projections  162  and  163  form the labyrinth  165  in a path that extends in the radial direction between the core bar  155  and the slinger  156 . This obviates the need for forming the axial lip for radially sealing the path on the core bar  155 . Therefore, the axial lip does not become an obstacle in magnetizing the magnetic pulser ring  157  to be fixed to the oppositional portion (radial portion)  155 A of the core bar  155 , allowing the manufacturing to be facilitated. 
     The point that this resin portion  161  can widen the harness outlet width by virtue of the inclined surface  161 A located at the axial end is similar to those of the aforementioned sixth and seventh embodiments shown in  FIG. 8  and  FIG. 9 . 
     In the aforementioned embodiment, the magnetized pulser ring  157  is fixed to the axial outer surface of the oppositional portion  155 A of the core bar  155 . However, as indicated by the one-dot chain lines, the magnetized pulser ring  157  may be fixed to the axial inner surface of the oppositional portion  155 A. 
     Tenth Embodiment 
     Next,  FIG. 12  shows the wheel speed detector of the tenth embodiment of the present invention. The present tenth embodiment is integrated with a seal device  173  arranged between an inner ring  171  and an outer ring  172 . This seal device  173  is provided with a sectionally inverted L-figured slinger  175  that serves as a rotating side member fixed to the inner peripheral surface of the outer ring  172  located on the rotating side and a sectionally L-figured core bar  176  that serves as a stationary side member fixed to the outer peripheral surface of the inner ring  171  located on the stationary side. 
     The sectionally L-figured core bar  176  is provided with a cylindrical portion  176 A and a flange portion  176 B that radially extends from the axial outer end of this cylindrical portion  176 A. This flange portion  176 B has an axial through hole  177 , and a magnetic sensor  178  is fit in this axial through hole  177 . Then, a seal lip  180  is fixed to the core bar  176  so as to cover this magnetic sensor  178 . This seal lip  180  is provided with a main lip  180 A, an auxiliary lip  180 B and an axial lip  180 C. This axial lip  180 C obliquely extends inwardly in the axial direction and outwardly in the radial direction from the root portion toward the leading end. The main lip  180 A and the auxiliary lip  180 B are brought in sliding contact with a cylindrical portion  175 A of the sectionally inverted L-figured slinger  175 , while the axial lip  180 C is brought in sliding contact with a flange portion  175 B of the sectionally inverted L-figured slinger  175 . 
     A magnetized pulser ring  181  that serves as a magnetic ring is fixed to the axial outer surface of the flange portion  175 B of the sectionally inverted L-figured slinger  175  so as to face the magnetic sensor  178 . 
     The magnetized pulser ring  181  and the magnetic sensor  178  constitute the wheel speed detector of the present tenth embodiment. A signal line  182  is connected to the radial inner end surface of this magnetic sensor  178 , and this signal line  182  is buried in a resin portion  183  fixed to the end surface of the core bar  176  and extends outwardly in the axial direction and outwardly in the radial direction. 
     In the present tenth embodiment, part of the magnetic sensor  178  is arranged inside the axial through hole  177  formed through the core bar  176 . This arrangement can promote the space saving and provides excellent mountability in the case of a small space. In the present tenth embodiment, all the seal lips (main lip  180 A, auxiliary lip  180 B and axial lip  180 C) are fixed to the core bar  176  to which the magnetic sensor  178  is fixed, and therefore, the structure becomes simple. 
     Eleventh Embodiment 
     Next,  FIG. 13  shows the wheel speed detector of the eleventh embodiment of the present invention. The present eleventh embodiment is constructed of a magnetic sensor  193  and a magnetized pulser ring  203  and integrated with the inside of a seal device  187  arranged between an inner ring  185  and an outer ring  186 . This seal device  187  is provided with a sectionally inverted L-figured core bar  188  fixed to the inner peripheral surface of the outer ring  186  located on the stationary side and a sectionally reversed L-figured slinger  191  fixed to the outer peripheral surface of the inner ring  185  located on the rotating side. The seal device  187  is further provided with an inverted L-figured metal fitting  192  fixed in an overlapping manner to a cylindrical portion  188 A of the core bar  188 . A magnetic sensor  193  is fixed to the inner surface of an axial end radial portion  192 A of this inverted L-figured metal fitting  192 , and this magnetic sensor  193  is covered with a resin  194 . A signal line  195  extending from this magnetic sensor  193  extends obliquely outwardly inside a resin portion  197  through a hole  196  formed through a cylindrical portion  192 B of the inverted L-figured metal fitting  192 . This resin portion  197  is fixed to the L-figured metal fitting  192  and extends obliquely outwardly. 
     A second auxiliary lip  200  is fixed to an inner end  198  bent inwardly of the radial portion  192 A of this inverted L-figured metal fitting  192 . This second auxiliary lip  200  is externally brought in sliding contact with a flange portion  191 A of the slinger  191 . 
     On the other hand, a main lip  201  and a first auxiliary lip  202  are fixed to the inner end of an inner flange  188   b  of the core bar  188 , and this main lip  201  and the first auxiliary lip  202  are brought in sliding contact with a cylindrical portion  191 B of the slinger  191 . A leading end portion  191 A- 1  of the flange portion  191 A of this slinger  191  is bent inward, and a magnetized pulser ring  203  that serves as a magnetic ring is fixed to the inner surface of this leading end portion  191 A- 1 . An axial lip  205  constructed of a nonmagnetic elastic member is fixed to the magnetized pulser ring  203  so as to cover the magnetized pulser ring  203 , and this axial lip  205  is brought in sliding contact with the inner flange  188 B of the core bar  188 . 
     The wheel speed detector of the present eleventh embodiment is protected from an external impact such as a kicked stone by the inverted L-figured metal fitting  192 . Both the magnetic sensor  193  and the magnetized pulser ring  203  are covered with the resin  194  constructed of a nonmagnetic member and the axial lip  205  so as to be protected from moisture and dust. The inverted L-figured metal fitting  192  and the slinger  191  constitute a labyrinth  206 , and a sealing performance is improved by the existence of the added second auxiliary lip  200  provided for the inverted L-figured metal fitting  192 . 
     Twelfth Embodiment 
     Next,  FIG. 14  shows the wheel speed detector of the twelfth embodiment of the present invention. The present twelfth embodiment is constructed of a magnetic sensor  211  fixed to a sectionally step-shaped stationary side member  215  and a magnetized pulser ring  212  fixed to a sectionally step-shaped rotating side member  216 . 
     The stationary side member  215  is fixed to the outer peripheral surface of an outer ring  217 , bent inward along the end surface and then extended in the axial direction. The rotating side member  216  is fixed to the outer peripheral surface of an inner ring  218 , bent radially outwardly and extended in the axial direction so as to face the stationary side member  215  with interposition of a specified gap. The stationary side member  215  and the rotating side member  216  face each other in the respective oppositional portions  215 A and  216 A. A magnetic sensor  211  is fixed to the outer peripheral surface of this oppositional portion  215 A, and a magnetized pulser ring  212  is fixed to the inner peripheral surface of the oppositional portion  216 A. 
     The magnetic sensor  211  is completely covered with a resin portion  223  fixed to the stationary side member  215 . This resin portion  223  has a connecting portion  223 A that is projecting obliquely in the axial direction. 
     The magnetized pulser ring  212  is covered with a cover  220  constructed of a nonmagnetic elastic member, and this cover  220  has a seal lip  220 A brought in sliding contact with the oppositional portion  215 A of the stationary side member  215 . A core bar  221  is fixed to the inner peripheral surface of the outer ring  217 , and a seal lip  222  is fixed to a flange  221 A of this core bar  221 . This seal lip  222  has a main lip  222 A, a first auxiliary lip  222 B and an axial lip  222 C. The main lip  222 A and the first auxiliary lip  222 B are brought in sliding contact with a cylindrical portion  216 B of the rotating side member  216 . The axial lip  222 C is brought in sliding contact with a flange portion  216 C of the rotating side member  216 . 
     The wheel speed detector of the present twelfth embodiment is constructed of the magnetic sensor  211  and the pulser ring  212  and is integrated with a seal device constructed of the stationary side member  215 , rotating side member  216 , core bar  221  and seal lips  222  and  220 A. This arrangement can simplify the overall structure and reduce the number of components. The magnetic sensor  211  and the pulser ring  212  are completely covered with the resin portion  223  and the cover  220 , and therefore, the external influence of a foreign material can be avoided. The mixture of a foreign material into the sensor portion can be prevented by the second auxiliary lip  220 A. 
     Thirteenth Embodiment 
     Next,  FIG. 15  shows the wheel speed detector of the thirteenth embodiment of the present invention. The present thirteenth embodiment is constructed of a magnetized pulser ring  231  and a magnetic sensor  232  that face each other in the axial direction. The magnetized pulser ring  231  is fixed to a core bar  233  and covered with a thin film  235  constructed of a nonmagnetic elastic member continued from a seal lip  234 . The magnetic sensor  232  is fixed to a slinger  236  and is covered with a nonmagnetic thin film  238  continued from a resin portion  237 . 
     The core bar  233  has a disk portion  233 A that extends radially inwardly at the axial inner end, and a seal lip  234  is fixed to this disk portion  233 A. This seal lip  234  has the three lips of a main lip  234 A, an auxiliary lip  234 B and an axial lip  234 C. The main lip  234 A and the auxiliary lip  234 B are brought in sliding contact with a cylindrical portion  236 A of the slinger  236 , while the axial lip  234 C is brought in sliding contact with a flange portion  236 B of the slinger  236 . 
     On the other hand, a resin portion  237  fixed to the slinger  236  has an annular projection  237 A that faces the inner peripheral surface of an outer peripheral wall  233 B of the core bar  233 , and this annular projection  237 A forms a labyrinth between the annular projection  237 A and the outer peripheral wall  233 B. Further, a harness  240  is projecting from an axial end surface  237 B of the resin portion  237 . 
     Then, a cylindrical portion  236 A of the slinger  236  is fixed to an inner ring  241 , and a cylindrical portion  233 C of the core bar  233  is fixed to an outer ring  242 . 
     The core bar  233 , the slinger  236 , the seal lip  234  and the annular projection  237 A of the resin portion  237  constitute a seal device. 
     In the wheel speed detector of the present thirteenth embodiment, the magnetized pulser ring  231  and the magnetic sensor  232  are integrated with the inside of the seal device. This enables the compacting and space saving and improves the assembling workability. 
     Further, the annular projection  237 A fixed to the slinger  236  and the outer peripheral wall  233 B of the core bar  233  constitute the labyrinth structure. This arrangement can prevent the external foreign material from entering the portion where the magnetic sensor  232  and the pulser ring  231  face each other and avoid the influence of the foreign material on the signal. The pulser ring  231  is covered with the thin film  235  made of a nonmagnetic elastic member, and the magnetic sensor  232  is covered with the nonmagnetic thin film  238  connected to the resin portion  237 . Therefore, the waterproof performance can be improved. 
     Fourteenth Embodiment 
     Next,  FIG. 16  shows the wheel speed detector of the fourteenth embodiment of the present invention. The present fourteenth embodiment is integrated with the inside of a seal device  247  for sealing a gap between a rotating side inner ring  245  and a stationary side outer ring  246 . 
     This seal device  247  is provided with a core bar  248  fixed to the outer ring  246  and a slinger  250  fixed to the inner ring  245 . A seal lip  251  is fixed to an inner diameter portion  248 A of a core bar  248 . This seal lip  251  is provided with a main lip  251 A and a first auxiliary lip  251 B brought in sliding contact with a cylindrical portion  250 A of the slinger  250  and an axial lip  251 C brought in sliding contact with a disk portion  250 B of the slinger  250 . 
     The core bar  248  is provided with a bent portion  248 B that is bent along a corner  246 A of the outer ring  246  and an outer peripheral portion  248 C that extends axially outwardly from a radial end of this bent portion  248 B. A removable cover metal fitting  252  is mounted on the inside of the outer peripheral portion  248 C of this core bar  248 . A magnetic sensor  256  is fixed to a resin  254  filled inside this cover metal fitting  252 . This cover metal fitting  252  is provided with a radial portion  252 A bent radially inwardly from the outer peripheral portion  248 C, and a second auxiliary lip  253  is fixed to an end of this radial portion  252 A. This second auxiliary lip  253  is brought in sliding contact with an axial portion  250 C of the slinger  250 . This cover metal fitting  252  is fixed to the core bar  248  by a calking portion  255  formed in the outer peripheral portion  248 C of the core bar  248 . By releasing the calking of this calking portion  255 , the cover metal fitting  252  can be removed from the core bar  248  by being slid in the axial direction. A hole  258  through which a signal line  257  extending from the magnetic sensor  256  extends is formed through this cover metal fitting  252 . This signal line  257  is led obliquely outwardly in the axial direction and is buried in a resin portion  259  fixed to the radial portion  252 A of the cover metal fitting  252 . 
     A magnetized pulser ring  260  of the present fourteenth embodiment is fixed to an axial portion  250 C of the slinger  250  and made to face the magnetic sensor  256 . The wheel speed detector of the present fourteenth embodiment, in which the magnetic sensor  256  and the pulser ring  260  are integrated with the inside of the seal device  247 , can be compacted, allowing the mounting work to be simplified. The magnetic sensor  256  is mounted on the removable cover metal fitting  252  according to this wheel speed detector, and therefore, the magnetic sensor  256  can be easily replaced. The second auxiliary lip  253  can prevent the foreign material from entering a portion where the pulser ring  260  and the magnetic sensor  256  face each other. 
     Fifteenth Embodiment 
     Next,  FIG. 17  shows the wheel speed detector of the fifteenth embodiment of the present invention. The present fifteenth embodiment is integrated with the inside of a seal device  263  for sealing a gap between a rotating side outer ring  261  and a stationary side inner ring  262 . 
     This seal device  263  is provided with a core bar  265  fixed to a corner  261 A located on the inner diameter side of the outer ring  261  and a slinger  266  fixed to the inner peripheral surface of the inner ring  262 . A seal lip  267  is fixed to the inner end of an inner diameter portion  265 A of the core bar  265 . This seal lip  267  is provided with a main lip  267 A, an auxiliary lip  267 B and an axial lip  267 C. The main lip  267 A and the first auxiliary lip  267 B are brought in sliding contact with an inside axial portion  266 A of a slinger  266 , while an axial lip  267 C is brought in sliding contact with a disk portion  266 B of the slinger  266 . 
     The core bar  265  has an outside axial portion  265 B, and a cover metal fitting  268  is fixed to the inner side of the outside axial portion  265 B by a calking portion  270  of this outside axial portion  265 B. This cover metal fitting  268  is constructed of an axial portion  268 A and a radial portion  268 B that is bent inward in the radial direction. A magnetized pulser ring  271  is fixed to the inside of this axial portion  268 A, and a second auxiliary lip  272  is fixed to an end of the radial portion  268 B. This second auxiliary lip  272  is brought in sliding contact with an axial end of an outer axial portion  266 C of the slinger  266 . 
     A magnetic sensor  273  is fixed to the outer axial portion  266 C of this slinger  266  so as to face the magnetized pulser ring  271 . This magnetic sensor  273  is covered with a resin layer  275 , and a signal line  276  extending from the magnetic sensor  273  is led radially inwardly through a hole  277  formed through the outer axial portion  266 C. This signal line  276  is connected to a harness  278  that extends in the circumferential direction, and this harness  278  is buried in a resin portion  280  fixed to the disk portion  266 B and the outer axial portion  266 C of the slinger  266 . 
     The wheel speed detector of the present fifteenth embodiment, in which the harness  278  connected to the signal line  276  extending from the magnetic sensor  273  is buried in the resin portion  280  fixed to the disk portion  266 B and the axial portion  266 C of the slinger  266  and led in the circumferential direction, can assure the strength of the root portion of the harness  278 . The cover metal fitting  268  is removably fixed to the core bar  265  by the calking portion  270  of the core bar  265 . This arrangement can simplify the replacement of the magnetized pulser ring  271  fixed to the cover metal fitting  268 . The second auxiliary lip  272  mounted on the cover metal fitting  268  can prevent the foreign material from entering the sensor portion. 
     Sixteenth Embodiment 
     Next,  FIG. 18  shows the wheel speed detector of the sixteenth embodiment of the present invention. The present sixteenth embodiment is integrated with the inside of a seal device  283  for sealing a gap between a rotating side outer ring  281  and a stationary side inner ring  282 . 
     This seal device  283  is provided with a core bar  285  fixed to the inner peripheral surface of the outer ring  281  as well as a first slinger  286  and a second slinger  287  that are fixed to the outer peripheral surface of the inner ring  282 . The core bar  285  is provided with a radial portion  285 A, and a seal lip  288  is fixed to the radial portion  285 A. This seal lip  288  has a main lip  288 A and an auxiliary lip  288 B that are brought in sliding contact with a cylindrical portion  286 A of the first slinger  286  and an axial lip  288 C brought in sliding contact with a radial portion  286 B of the first slinger  286 . 
     On the other hand, the second slinger  287  is fixed to the axial end of the outer peripheral surface of the inner ring  282  and is provided with a radial portion  287 A that extends radially outwardly and an axial portion  287 B that extends axially inwardly. A magnetic sensor  290  is fixed to the inner surface of this radial portion  287 A, and this magnetic sensor  290  is covered with a resin portion  291 . A signal line  292  extending from this magnetic sensor  290  is led obliquely outwardly in the axial direction through a hole  293  formed through the axial portion  287 B and buried in the resin portion  291  that is projecting obliquely outwardly in the axial direction. An annular projection  296  that faces the outer peripheral surface of the outer ring  281  with interposition of a slight gap in the circumferential direction is fixed to the inner surface of the axial portion  287 B of the second slinger  287 . 
     A magnetized pulser ring  297  is fixed to an axial end surface  281 A of the outer ring  281  so as to face the magnetic sensor  290 . 
     The present sixteenth embodiment, in which the magnetized pulser ring  297  is made to directly adhere to the outer ring  281  located on the rotating side, has a simple structure and a reduced number of components. The annular projection  296  formed on the second slinger  287  forms the labyrinth structure and is able to prevent water and dust from entering the magnetized pulser ring  297 . 
     In the present sixteenth embodiment, the magnetic sensor  290  is fixed to the inner surface of the radial portion  287 A of the second slinger  287 . However, as shown in  FIG. 19 , the magnetic sensor  290  may be fixed to the outer surface of the radial portion  287 A. In this case, the second slinger  287  can be put close to the outer ring  281 , allowing the compacting to be achieved. 
     The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Technology Classification (CPC): 5