Abstract: A rolling bearing unit with a rotational speed sensor comprising a stationary outer ring having a first raceway, a rotatable inner ring having a second raceway, a plurality of rolling elements rotatably provided between the first and second raceways, a sensor support case having a step portion for axial positioning, a detecting portion and a sensor mounted therein, an encoder having circumferentially changing magnetic characteristics and connected to the rotatable ring, a cover made of a synthetic resin, connected to the stationary ring, and having a fitting portion with respect to the outer ring, the fitting portion formed with a groove for mounting an seal-ring therein, a mount hole for inserting part of the sensor support case therein, and a portion abutted to the step portion of the sensor support case for axial positioning, and an elastic member having a first portion engaged with the cover and a second portion engaged with the sensor support case to fix the sensor support case to the cover.

Abstract: Outer peripheral portions of magnetizing terminals 39a constituting a magnetizing apparatus 33a for magnetizing a permanent magnet 32, are made longer than inner peripheral portions. Coils 40 for magnetization are wound around the shorter length inner peripheral portions. A distance L32 between the magnetizing terminals 39a and a step portion 37 of a support ring 34 can thus be shortened, so that the axial length of the encoder 31a can be reduced. This results in reducing the axial length of an encoder 31a to thereby miniaturize and lighten a speed sensing rolling bearing unit incorporating the encoder 31a.

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary ring having an opening end portion and a peripheral surface formed with a first raceway, a rotatable ring having a peripheral surface formed with a second raceway, a plurality of rolling members provided between the first and second raceways, a generally annular tone wheel supported by the rotatable ring and comprising a multi-pole magnet having S-poles and N-poles alternately arranged in a circumferential direction, a cover fixed to the opening end portion, anda sensor supported by the cover and having a front face opposed to the tone wheel and a rear face to which a magnetic member is placed close.

Abstract: In the rolling-bearing unit with rpm detecting device of this invention, there are first and two opposing sections where the sensor is faced to the tone wheel, and the magnetic resistance at these two opposing sections changes at the same time as the rotating ring rotates. These two opposing sections are located in series in the magnetic circuit which includes the stator.

Abstract: A rolling bearing unit having a tone wheel and a seal device which has an elastic seal member and a core metal to reinforce the elastic seal member to seal the space where the rolling members are provided, the tone wheel comprising an annular multi-pole magnet with South and North poles alternately arranged in a circumferential direction an supported by the generally annular seal ring.

Abstract: A rolling-ball bearing unit with a rotating speed sensor comprising rotating and stationary rings, a tonewheel, a first seal ring provided to seal between the tonewheel and the section where rolling members are provided, and a second seal ring having a base end portion fixed to the peripheral portion of a cover for the sensor and a tip end portion provided in a sliding contact relationship with a member provided axially adjacent the bearing unit and rotating with the rotating ring, and a harness take-out portion provided in a relatively their portion of the cover.

Abstract: A hub unit with rotation speed sensor comprising;a stationary outer ring member having an outer raceway formed thereon, a rotatable hub having an axially inner end with a male thread portion formed thereon,a inner ring member having an inner raceway formed thereon, and fittingly fixed onto the hub, a nut screwed on the male thread portion of the hub to axially retain the inner ring, a plurality of rolling members located between the outer raceway and the inner raceway, a cover fittingly fixed to the outer ring member at its opening end portion, an annular sensor supported by the cover so as to be located radially between the nut and the cover, a rotatable tone wheel made of magnetic material and fittingly fixed onto the inner ring, the sensor comprising an annular permanent magnet, a magnetic stator and a coil, so that the sensor is opposed generally circumferentially to part of the tone wheel with a small clearance therebetween.

Abstract: A rolling bearing unit has an outer ring member and a rotating speed sensor which is embedded in a synthetic resin block in a cover having a cylindrical portion such that a plurality of protrudents 33 are formed on the outer peripheral face of the synthetic resin block 21 to have its axially inner half portion fitted into the cylindrical portion 19 of the cover 18 in an interference relationship and to have its axially outer half portion fitted into the cylindrical portion 31 of the outer ring member 8 in an interference relationship, thereby preventing the synthetic resin block 21 from being subjected to a large moment load.

Abstract: A rolling bearing unit having a rotating speed detector includes an outer race, an inner race, a cover made of synthetic resin, a sleeve made cylindrically of metal, and a seal ring fitted between the cover and the outer race, in which a first leaking passage exists between a first clearance formed on an engaging surface between the sleeve and the outer race and a third clearance formed between the outer race and the cover, the first and the third clearances being arranged in series to each other, and a second leaking passage exists between the third clearance and a second clearance formed in a contact portion of the sleeve with the cover, the third and the second clearances being arranged in series to each other. The single seal ring is capable of preventing the entrance of muddy water into the cover and the outer race through the first and the second clearance.

Abstract: A rolling bearing unit with rotating speed sensor comprising a stationary ring having a first raceway, a rotatable ring placed concentric with the stationary ring and having a second raceway, a plurality of rolling elements provided between the first and second raceways, a magnetic tone wheel supported by the rotating ring to rotate together with the rotating ring and having cutouts for an encoder portion, and a sensor supported by the stationary ring to be opposed to the tone wheel and having a detecting portion opposed to the encoder portion with a small gap therebetween, wherein the cutouts are produced through a punching stroke from the side of the magnetic metal plate which is not faced to the small gap to the side of the magnetic metal plate which is faced to the small gap in the assemble state.

Abstract: A bearing unit with a rotational speed detection unit has a tone wheel which has recesses on its outer peripheral surface and rotates with the magnetic hub and the inner ring, a sensor which has a first stator with notches and a second stator, and a permanent magnet, so that due to the changes in phase of the notches and recesses, the density of the magnetic flux from the permanent magnet is changed, with the magnetic flux led to the second stator and to the hub and inner ring, whereby the number of winding in the coil is increased.

Abstract: An inserting portion of a holding case holding a sensor is inserted in a fitting hole formed in the cylindrical wall portion of the cover. The hold-down frame portion of a hold-down member pivoted to the cylindrical wall portion is used to press the base portion of the holding case against the outer peripheral face of the cylindrical wall portion. The contact area between the base portion and the cylindrical wall portion is shut with an O-ring, so that any extraneous matter such as rainwater is prevented from penetrating into the cover. Also, a pair of elastic retaining pieces are provided for a plastic material which embeds a sensor. A pair of retaining projections are provided on the outer peripheral edge of a collar portion formed in the leading end portion of a cylindrical holding portion provided for a cover.

Abstract: A rolling-bearing unit including a stationary ring, a rotating ring, an annular magnetic tone wheel having a cutout section with cutouts formed at equal intervals at a pitch, and a sensor facing the tone wheel. The sensor comprises a pair of annular or cylindrical permanent magnets arranged concentric with the tone wheel, an annular or cylindrical stator of magnetic material magnetically connected with the permanent magnets and provided concentric with the tone wheel, and an annular or cylindrical coil provided concentric with the tone wheel and proximate a central portion of the stator. Like magnetic poles of the pair of permanent magnets are magnetically connected to opposite ends of the stator. Peripheral faces of either the magnets or ring portions of the stator are formed with alternating recesses and protrusions with the same pitch as in the cutout section of the tone wheel and facing the cutout section of the tone wheel.

Abstract: The sensor 20a has first and second permanent magnets 31, 32, stator 33 and coil 24. The first and second permanent magnets 31, 32 has an inner peripheral face formed with south and north poles circumferentially and alternately with a uniform space therebetween. Holes 17a, 17b are formed circumferentially with a uniform space therebetween in the tone wheel 13. At the moment when all the south poles in the first permanent magnet 31 are opposed to the holes 17a, all the north poles of the second permanent magnets 32 are opposed to the holes 17b, resulting in that the alternating magnetic flux flows in the stator 33 and the electric voltage is generated alternately in opposite directions in the coil 24 as the tone wheel 13 rotates.

Abstract: A rolling bearing unit with rotating speed detector comprising an inner ring member with an inner ring raceway and a rotatable outer ring member with an outer ring raceway, a plurality of rolling bodies provided between the inner ring raceway and outer ring raceway, an annular, magnetic tone wheel fitted to the outer ring member, a support ring fitted to the axial end of the inner ring member, an annular sensor supported by the support ring so as to be faced to the tone wheel generally in a circumferential direction, the sensor comprising an annular magnetic pole piece, annular permanent magnet and annular coil, so that one end in magnetic orientation of the permanent magnet is placed adjacent to one end portion of the pole piece, while the other end in magnetic orientation is placed magnetically adjacent to the tone wheel, the coil provided adjacent to the pole piece, the tone wheel having cut-outs formed with a uniform pitch in a circumferential direction and faced across a clearance to a portion of the pol

Abstract: A rolling bearing unit having a tone wheel and a seal device which has an elastic seal member and a core metal to reinforce the elastic seal member to seal the space where the rolling members are provided, the tone wheel comprising an annular multi-pole magnet with South and North poles alternately arranged in a circumferential direction an supported by the generally annular seal ring.

Abstract: A speed sensing rolling bearing unit having a hub rotating together with a vehicle wheel, a tone wheel fixed to the hub and made from a light-shielding material circumferentially provided with a number of light transmitting portion or a non-reflecting material circumferentially provided with a number of light-reflecting portions, a dover having a synthetic resin block in it, and a sensor embedded in the synthetic resin block and comprising a light-emitting element and a light-receiving element which receives the light from the light-emitting element intermittently as the hub rotates.

Abstract: A bearing unit with a rotational speed detection unit has a tone wheel which has recesses on its outer peripheral surface and rotates with the magnetic hub and the inner ring, a sensor which has a first stator with notches and a second stator, and a permanent magnet, so that due to the changes in phase of the notches and recesses, the density of the magnetic flux from the permanent magnet is changed, with the magnetic flux led to the second stator and to the hub and inner ring, whereby the number of winding in the coil is increased.

Abstract: A rolling bearing unit with rotating speed detector comprising an inner ring member with an inner ring raceway and a rotatable outer ring member with an outer ring raceway, a plurality of rolling bodies provided between the inner ring raceway and outer ring raceway, an annular, magnetic tone wheel fitted to the outer ring member, a support ring fitted to the axial end of the inner ring member, an annular sensor supported by the support ring so as to be faced to the tone wheel generally in a circumferential direction, the sensor comprising an annular magnetic pole piece, annular permanent magnet and annular coil, so that one end in magnetic orientation of the permanent magnet is placed adjacent to one end portion of the pole piece, while the other end in magnetic orientation is placed magnetically adjacent to the tone wheel, the coil provided adjacent to the pole piece, the tone wheel having cut-outs formed with a uniform pitch in a circumferential direction and faced across a clearance to a portion of the pol

Abstract: A rolling bearing unit with a rotational speed sensor has a sensor which is clamped on opposite axial sides between the end plate of the cover and an axial end face of the open end portion of the outer ring member with the engaging portion externally secured to the open end portion of the outer ring member.