WO2012011297A1 - エンコーダ付車輪支持用転がり軸受ユニット - Google Patents
エンコーダ付車輪支持用転がり軸受ユニット Download PDFInfo
- Publication number
- WO2012011297A1 WO2012011297A1 PCT/JP2011/052479 JP2011052479W WO2012011297A1 WO 2012011297 A1 WO2012011297 A1 WO 2012011297A1 JP 2011052479 W JP2011052479 W JP 2011052479W WO 2012011297 A1 WO2012011297 A1 WO 2012011297A1
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- WIPO (PCT)
- Prior art keywords
- cover
- axial direction
- encoder
- outer ring
- inner end
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
- F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
- B60B27/0005—Hubs with ball bearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
- B60B35/02—Dead axles, i.e. not transmitting torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B7/00—Wheel cover discs, rings, or the like, for ornamenting, protecting, venting, or obscuring, wholly or in part, the wheel body, rim, hub, or tyre sidewall, e.g. wheel cover discs, wheel cover discs with cooling fins
- B60B7/0013—Hub caps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/768—Sealings of ball or roller bearings between relatively stationary parts, i.e. static seals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2380/00—Bearings
- B60B2380/10—Type
- B60B2380/12—Ball bearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2380/00—Bearings
- B60B2380/70—Arrangements
- B60B2380/73—Double track
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
- B60B27/0047—Hubs characterised by functional integration of other elements
- B60B27/0068—Hubs characterised by functional integration of other elements the element being a sensor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
- B60B27/0073—Hubs characterised by sealing means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2900/00—Purpose of invention
- B60B2900/30—Increase in
- B60B2900/325—Reliability
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2900/00—Purpose of invention
- B60B2900/30—Increase in
- B60B2900/331—Safety or security
- B60B2900/3312—Safety or security during regular use
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2200/00—Type of vehicle
- B60Y2200/10—Road Vehicles
- B60Y2200/11—Passenger cars; Automobiles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
- F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
- F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
- F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
- F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/30—Angles, e.g. inclinations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/60—Thickness, e.g. thickness of coatings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
Definitions
- the present invention relates to a rolling bearing unit that supports a vehicle wheel rotatably with respect to a suspension device and includes an encoder for detecting the rotational speed of the wheel. More specifically, the present invention relates to an improvement in a rolling bearing unit with an encoder having a structure in which a cover that closes an axially inner end opening of an internal space in which an encoder is installed is fitted and fixed to an axially inner end of an outer ring.
- rolling bearing units that support a wheel rotatably on a suspension system of an automobile and have a rotational speed detector for detecting the rotational speed of the wheel.
- the detection part of the sensor supported and fixed to the non-rotating part is opposed to the detection surface of the encoder supported and fixed to a part of the hub that rotates together with the wheel.
- the rotational speed of the said wheel rotating with this encoder may be calculated
- FIG. 11 shows an example of the conventional structure described in Patent Document 1 among them.
- This conventional structure includes a rolling bearing unit 2 with an encoder in which an encoder 1 is incorporated, and a sensor 4 supported and fixed to a knuckle 3 constituting a suspension device.
- the encoder 1 is supported and fixed concentrically with the hub 6 at the axially inner end of the hub 6 constituting the rolling bearing unit 5.
- the rolling bearing unit 5 includes an outer ring 7 and a plurality of rolling elements 8 in addition to the hub 6.
- the outer ring 7 has a double row outer ring raceway 9 on the inner peripheral surface and a stationary flange 10 on the outer peripheral surface. In use, the outer ring 7 is supported by the knuckle 3 and does not rotate.
- the hub 6 includes a hub main body 11 and an inner ring 12 that is formed on the inner end in the axial direction of the hub main body 11 and is fixed to the hub main body 11 by a caulking portion 13.
- the inner ring raceway 14 is arranged in a row, and is supported concentrically with the outer ring 7 on the inner diameter side of the outer ring 7.
- a rotation-side flange 15 for supporting the wheel is provided at a portion of the hub main body 11 that protrudes outward in the axial direction from the axial outer end opening of the outer ring 7 at the outer end in the axial direction. .
- each of the rolling elements 8 is provided between the outer ring raceway 9 and the inner ring raceway 14 so as to be freely rollable in a state of being held by a cage 16 in each row. Yes. Further, both end portions in the axial direction of the internal space 17 in which the rolling elements 8 are installed are closed by a seal ring 18 and a cover 19.
- “outside” in the axial direction refers to a side that is located outward in the width direction of the vehicle body when assembled to the suspension device. On the other hand, “inside” with respect to the axial direction means the side closer to the center in the width direction of the vehicle body when assembled to the suspension device.
- the cover 19 is formed of a non-magnetic metal plate such as an aluminum alloy plate, an austenitic stainless steel plate, or other non-magnetic material.
- a cover 19 includes a cylindrical portion 20 that extends in the axial direction, and a flat plate portion 21 that is bent and extends radially inward from the axial inner end of the cylindrical portion 20.
- the flat plate portion 21 is opened in the axial inner end of the outer ring 7. It has a disk shape that covers the entire part.
- the flat plate portion has an annular shape so that the drive shaft can be inserted into the inner diameter side of the cover.
- the cover 19 is fixed to the inner end portion in the axial direction of the outer ring 7 by fitting the cylindrical portion 20 into the inner end portion in the axial direction of the outer ring 7 with an interference fit.
- the encoder 1 is fitted to the hub 6 by fitting the base end portion thereof to a portion close to the inner end of the hub 6 as described above, that is, the shoulder portion 22 provided in the inner half portion of the inner ring 12 in the axial direction. On the other hand, it is supported and fixed concentrically with the hub 6.
- the encoder 1 includes a support ring 23 having an L-shaped cross section and an annular shape as a whole by bending a magnetic metal plate such as a mild steel plate, and an encoder body 24 made of a permanent magnet such as a rubber magnet.
- the encoder body 24 is magnetized in the axial direction, and by changing the magnetization direction alternately and at regular intervals with respect to the circumferential direction, the S pole and the N pole are provided on the inner side surface in the axial direction, which is the detected surface. They are arranged alternately and at equal intervals.
- the detected surface of the encoder main body 24 is opposed to the axially outer surface (surface on the inner space side) of the flat plate portion 21 constituting the cover 19 via a minute gap. In other words, the cover 19 is pushed into the inner end of the outer ring 7 in the axial direction until the axially outer surface of the flat plate portion 21 is in close proximity to the detected surface of the encoder body 24.
- the sensor 4 is in contact with the axial inner side surface (outer surface) of the flat plate portion 21 while being supported and fixed to the knuckle 3.
- the detection unit faces the detection surface of the encoder body 24 through the flat plate portion 21.
- the S pole and the N pole existing on the detection surface alternately pass through the vicinity of the detection portion of the sensor 4.
- the output changes. Since the frequency of the change is proportional to the rotational speed of the hub 6 and the period of the change is inversely proportional to the rotational speed, the rotational speed of the wheel fixed to the hub 6 is based on either or both of these frequencies and periods. Is required.
- the encoder body 24 made of permanent magnets and the external space are separated by a cover 19 made of a nonmagnetic material. It is possible to prevent foreign matter from adhering. As a result, the surface to be detected is maintained in a clean state, and the reliability of rotation speed detection using the encoder body 24 is ensured. However, from the aspect of further improving the reliability of the rotational speed detection, the following points are improved to improve the accuracy regarding the distance between the detected surface of the encoder body 24 and the detecting portion of the sensor 4. It is hoped that
- the flat plate existing on the inner diameter side of the cylindrical portion 20.
- a force directed radially inward is applied to the portion 21.
- the radius of curvature of the bent portion existing in the continuous portion between the outer peripheral edge of the flat plate portion 21 and the axial inner end edge of the cylindrical portion 20 is small (that is, bent with a large curvature), A portion that is internally fitted and fixed by the interference fit exists up to substantially the outer peripheral edge of the flat plate portion 21. For this reason, the radially inwardly applied force applied to the flat plate portion 21 is considerably increased, and the flat plate portion 21 is curved in the thickness direction (axially inward / outward direction) based on this force. Deform.
- the position cannot be regulated accurately. For example, when positioning the sensor 4 by abutting the detecting portion of the sensor 4 against the axial inner side surface (surface on the outer space side) of the flat plate portion 21, if the flat plate portion 21 is distorted, Inaccurate positioning. As a result, the density of the magnetic flux that comes out of the detection surface of the encoder body 24 and reaches the detection portion of the sensor 4 varies, which is disadvantageous in terms of ensuring the reliability of rotation speed detection.
- the present invention is configured such that a cover that closes an axially inner end opening of an internal space in which an encoder is installed is fitted and fixed to an axially inner end of an outer ring.
- the portion closer to the inner diameter than the portion to be fitted and fixed, that is, the flat plate portion that bends and extends radially inward from the axial inner end portion of the cylindrical portion of the cover is deformed in the axial direction. It aims at the realization of the structure which can prevent.
- the wheel support rolling bearing unit with an encoder of the present invention includes an outer ring, a hub, a plurality of rolling elements, an encoder, and a cover, similarly to the conventional wheel support rolling bearing unit with an encoder.
- the outer ring has a double-row outer ring raceway on the inner peripheral surface, and does not rotate while being supported and fixed to the suspension device during use.
- the hub has a double-row inner ring raceway on the outer peripheral surface, and rotates together with the wheel while the wheel is supported and fixed during use.
- a plurality of the rolling elements are provided in each row between the outer ring raceways and the inner ring raceways.
- the inner surface in the axial direction is a detected surface whose magnetic characteristics change alternately in the circumferential direction, and is supported and fixed to the hub concentrically with the hub.
- the cover is made of a non-magnetic plate, and includes a cylindrical portion that extends in the axial direction and a flat plate portion that is bent and extended radially inward from the axial inner end of the cylindrical portion.
- the cylindrical portion is fitted and fixed to the inner end portion in the axial direction of the outer ring with an interference fit, and the flat plate portion is made to face and face the detected surface of the encoder.
- the rolling bearing unit for supporting a wheel with an encoder of the present invention when the cover is fitted and fixed to the outer ring at the inner end in the axial direction of the cylindrical part constituting the cover, the inner peripheral surface of the outer ring The non-contact part which does not contact with is formed over the perimeter.
- the non-contact portion has an outer diameter smaller than the inner diameter of the inner end portion in the axial direction of the outer ring.
- the axial dimension of the non-contact portion is at least twice, preferably at least three times the thickness of the plate material constituting the cover.
- the axial dimension value of the non-contact portion in the case of obtaining the value twice (three times) is determined by fitting the cylindrical portion of the cover into the axial inner end portion of the outer ring by an interference fit. , Between the axial position of the axially inner side surface of the flat plate portion of the cover and the axial position of the contact point between the cylindrical portion of the cover and the outer ring in a state where the cylindrical portion of the cover is elastically deformed. The distance value.
- the cylindrical portion is placed on the inner end in the axial direction of the outer ring in a state where the cover is fitted in the inner end in the axial direction of the outer ring, rather than the non-contact portion. It is fitted with an interference fit only at the part outside the direction.
- the non-contact portion has a partially conical cylindrical shape that is inclined in a direction in which the diameter decreases toward the inside in the axial direction.
- the rolling bearing unit with a wheel support with an encoder according to the present invention when the rolling bearing unit with a wheel support with an encoder according to the present invention is implemented, it is preferable that the inner end surface of the outer ring protrudes inward in the axial direction from the inner end surface of the flat plate portion of the cover. Furthermore, when implementing the wheel support rolling bearing unit with an encoder of the present invention, between the detected surface of the encoder and the outer surface in the axial direction facing the detected surface of the encoder in the flat plate portion of the cover.
- a gap is formed closer to the axial outer end surface of the cylindrical portion of the cover and the inner ring axial end than the outer ring raceway of the outer ring, and the inner axial surface of the counter bore facing the axial outer end surface of the cylindrical portion of the cover It is preferable to make it larger than the gap between them.
- a gap between the detected surface of the encoder and the axially outer surface of the flat plate portion of the cover that faces the detected surface of the encoder is defined as an axial inner end surface (hub) of the hub.
- the clearance be larger than the clearance between the inner end surface of the caulking portion of the hub main body constituting the shaft or the inner end portion of the inner ring) and the axially outer side surface of the cover facing the inner end surface in the axial direction of the hub.
- the cover that closes the axial inner end opening of the inner space in which the encoder is installed is fitted and fixed to the axial inner end of the outer ring. Accordingly, the radially inward force applied to the flat plate portion of the cover is consumed to deform the non-contact portion existing between the cylindrical portion to be fitted and fixed and the flat plate portion.
- the flat plate portion can be prevented from being deformed in the axial direction. Therefore, it is possible to accurately regulate the surface position such as the axial position and the squareness of the portion of the flat plate portion that faces the detected surface of the encoder.
- the magnetic flux density that reaches the detection unit of the sensor from the detected surface of the encoder is sufficiently and reliably secured to detect the rotational speed. Reliability can be ensured.
- FIG. 1 is a partial sectional view showing a first example of an embodiment of the present invention.
- FIG. 2 is a partially enlarged cross-sectional view corresponding to the upper part of FIG. 1, showing the shape of the cover in the first example of the embodiment of the present invention.
- FIG. 3 is a partially enlarged cross-sectional view corresponding to the upper part of FIG. 1, showing the shape of the cover in the second example of the embodiment of the present invention.
- FIG. 4 is a view similar to FIG. 2 and FIG. 3, showing a modification example (A) of the first example and a modification example (B) of the second example in which the outer peripheral surface of the non-contact portion is covered with a sealing material. is there.
- FIG. 1 is a partial sectional view showing a first example of an embodiment of the present invention.
- FIG. 2 is a partially enlarged cross-sectional view corresponding to the upper part of FIG. 1, showing the shape of the cover in the first example of the embodiment of the present invention.
- FIG. 3 is a partially
- FIG. 5 is a partially enlarged sectional view showing a third example of the embodiment of the present invention.
- FIG. 6 is a partial sectional view showing a fourth example of the embodiment of the present invention.
- FIG. 7 is a partial sectional view showing a fifth example of the embodiment of the present invention.
- FIG. 8 is a partial sectional view showing a sixth example of the embodiment of the present invention.
- FIG. 9 is a partial sectional view showing a seventh example of the embodiment of the present invention.
- FIG. 10 is a partially enlarged cross-sectional view showing a modified example of the seventh example in which the outer peripheral surface of the non-contact portion is covered with a sealing material.
- FIG. 11 is a half sectional view showing an example of a conventional structure.
- FIG. 1 and 2 show a first example of an embodiment of the present invention.
- the features of the wheel bearing rolling bearing unit with an encoder of the present invention are such that the outer ring 7 is closed in order to close the axial inner end opening of the inner space 17 in which the rolling elements 8 and the encoder 1 are installed.
- the covers 19a to 19d are fitted and fixed to the inner ends in the axial direction, the flat plate portion 21 constituting the covers 19a to 19d is deformed in the thickness direction (the axial direction of the bearing unit including the cover). It is in the structure to suppress. Since the structure and operation of other parts are the same as those of a conventional rolling bearing unit with a wheel support with an encoder, the illustration and description are omitted or simplified, and the following description will focus on the characteristic parts of the present invention.
- the covers 19a to 19d are made of a non-magnetic plate such as an austenitic stainless steel plate such as SUS304, an aluminum alloy plate, or a synthetic resin plate, and have a cylindrical portion 20 extending in the axial direction on the outer peripheral portion, and an inner end portion in the axial direction. And a flat plate portion 21 that is bent and extended radially inward from the cylindrical portion 20. Of these, the cylindrical portion 20 is fitted and fixed to the inner end of the outer ring 7 in the axial direction by an interference fit.
- a non-magnetic plate such as an austenitic stainless steel plate such as SUS304, an aluminum alloy plate, or a synthetic resin plate
- the inner surface is closely opposed to each other through a minute gap 25.
- the non-contact part 26a is formed over the entire circumference at the axially inner end of the cylindrical part 20 constituting the cover 19a.
- the non-contact portion 26a has a partially conical cylindrical shape that is inclined in a direction in which the diameter decreases as it goes inward in the axial direction.
- the non-contact portion 26a is a cylinder in a state where the cylindrical portion 20 of the cover 19a is fitted and fixed to the inner end portion in the axial direction of the outer ring 7 by an interference fit, and the cylindrical portion 20 of the cover 19a is elastically deformed.
- the part which is not in contact with the inner peripheral surface of the outer ring 7 in the part 20 is meant.
- Outer diameter D 26 of the smaller diameter end of the non-contact portion 26a is smaller outer diameter D 26 (R 7 than the inner diameter R 7 in the axial inner end of the outer ring 7> D 26 ). Therefore, the inner peripheral surface of the outer ring 7 and the outer peripheral surface of the cylindrical portion 20 of the cover 19a are in the axial direction at the non-contact portion 26a in a state where the cover 19a is fitted into the inner end of the outer ring 7 in the axial direction. It does not contact (both peripheral surfaces are pressed in the radial direction). Only the portion of the cylindrical portion 20 that is axially outer than the non-contact portion 26a is fitted into the inner end portion in the axial direction of the outer ring 7 by an interference fit.
- the axial dimension L 26 of the non-contact portion 26a 2 times or more the thickness t 19 of the sheet material constituting the cover 19a (L 26 ⁇ 2t 19) , preferably three times or more (L 26 ⁇ 3t 19 ).
- the flat plate portion 21 is bent and extended radially inward from the small-diameter side end portion (axial inner end portion) of the non-contact portion 26a. From the viewpoint of suppressing the deformation of the flat plate portion 21, preferably as the axial dimension L 26 is large. However, when the axial dimension L 26 is excessively increased, the effect of suppressing deformation is saturated, whereas the fitting portion in the interference fit that contributes to fixing the cover 19a to the outer ring 7 is achieved.
- the axial dimension L 26 is set to 50% or less (L 26 ⁇ 0.5L 19 ), preferably about 20 to 35% of the axial length L 19 of the cover 19a.
- a part of the cylindrical part 20 in the axial direction is a part of the cylindrical part 20 in a free state with the cover 19a fitted and fixed to the inner end of the outer ring 7 in the axial direction.
- the cover 19a is fixed, in a state where the outer peripheral portion is elastically deformed, The distance between the axial position of the inner surface in the axial direction of the flat plate portion 21 of the cover 19a and the axial position of the contact point between the cylindrical portion of the cover 19a and the outer ring (starting point of fitting) is set. .
- the direction dimension L 26 can be increased to more than five times the thickness dimension t 19 .
- the outer peripheral surface of the non-contact portion 26a is not pressed radially inward.
- the axial position of the inner end surface of the cover 19a in the axial direction (surface on the outer space side) is made to coincide with the axial position of the inner end surface of the outer ring 7, so that the cover 19a is more in the axial direction than the outer ring 7. So that it does not protrude in the direction.
- a portion of the cylindrical portion 20 that is present in an axially outer portion than the non-contact portion 26a and that is fitted into the inner end portion in the axial direction of the outer ring 7 by an interference fit is strongly pressed radially inward. It is.
- the non-contact portion 26 a exists over the entire circumference between the portion fitted by the interference fit and the flat plate portion 21. For this reason, even if a strong force directed radially inward is applied to the portion fitted by the interference fit, most of the force is composed of the portion fitted by the interference fit and the flat plate. It is consumed in deforming the non-contact part 26 a existing between the part 21 and does not reach the flat plate part 21.
- the flat plate portion 21 extending radially inward from the outer periphery of the cover 19a is prevented from being deformed in the axial direction, and the encoder main body 24 constituting the encoder 1 among the flat plate portions 21 is prevented.
- the position in the axial direction of the portion facing the detected surface (the inner surface in the axial direction) can be accurately regulated.
- the perpendicularity of this part can also be made favorable. In other words, it is possible to suppress the deviation of the portion of the inner surface in the axial direction of the flat plate portion 21 against the detection portion of the sensor 4a from the virtual plane existing in the direction perpendicular to the central axis to zero or slightly.
- the axial position of the portion facing the detection surface of the encoder in the flat plate portion 21 and the surface accuracy such as the squareness can be regulated with high accuracy.
- the detection portion of the sensor 4a for detecting the rotational speed can be controlled. In the state where it abuts against the inner surface of the flat plate portion 21 in the axial direction, the posture of the sensor 4a and the axial position of the detection portion can be accurately regulated as designed values.
- the encoder It is possible to sufficiently and surely secure the density of the magnetic flux that comes out of the surface to be detected of the main body 24 and reaches the detection portion of the sensor 4a, thereby ensuring the reliability for detecting the rotational speed.
- the inclination angle ⁇ 1 of the bus of the non-contact portion 26a with respect to the central axis is preferably 10 to 45 degrees, more preferably 10 to 35 degrees, and most preferably 15 to 25 degrees.
- the inclination angle ⁇ 1 to 45 degrees or less it is possible to suppress the bending of the bent portion between the cylindrical portion 20 and the flat plate portion 21 at the time of processing, Occurrence of the peak of the fitting surface pressure due to the occurrence of the dripping is also suppressed.
- the inclination angle alpha 1 in the range above it is preferably small.
- the outer diameter D 24 of the encoder body 24 is reduced from the outer diameter D 26 of the end on the small diameter side of the non-contact portion 26a by a dimension corresponding to three times the plate thickness t 19 of the cover 19a. It is made smaller than the value (D 24 ⁇ D 26 -3t 19 ).
- FIG. 3 shows a second example of the embodiment of the present invention.
- the second example of the embodiment of the present invention is different from the first example in that the non-contact portion 26b is constituted by a small-diameter step portion having a step portion 27 interposed between the non-contact portion 26b and the outer portion in the axial direction.
- the non-contact portion 26b (cylindrical portion existing on the inner side in the axial direction from the stepped portion 27) has an outer diameter D 26 (R 7) smaller than the inner diameter R 7 of the inner end portion in the axial direction of the outer ring 7.
- the axial dimension L 26 is set to 50% or less (L 26 ⁇ 0.5L 19 ), preferably about 20 to 35% of the axial length L 19 of the cover 19b.
- the stepped portion 27 forms a partial conical cylindrical portion shown in the first embodiment, and then presses the inner diameter side R portion and the outer diameter side tapered surface between this portion and the cylindrical portion 20, and this portion.
- the inner side R portion between the flat plate portion 21 and the flat plate portion 21 is supported, and a punch is inserted from the inner side in the axial direction toward this portion. For this reason, like the first embodiment, the occurrence of sagging on the cylindrical portion side is suppressed.
- the inclination angle ⁇ 2 of the common tangent of the two outer diameter side R portions of the non-contact portion 26b with respect to the central axis is preferably 10 to 45 degrees, more preferably 10 to 35 degrees, and most preferably 15 to 25 degrees.
- the same operation and effect as the first example can be obtained.
- the covers 19a, 19b are utilized by utilizing non-contact portions 26a, 26b provided for preventing distortion of the flat plate portion 21. It is also possible to improve the sealing performance of the mounting portion. That is, as shown in FIGS. 4A and 4B, the outer peripheral surfaces of the non-contact portions 26a and 26b are filled with a sealing material 29 made of an elastic material containing an elastomer such as rubber or vinyl over the entire circumference. Then, the non-contact portions 26a and 26b may be covered with the sealing material 29.
- the outer diameter of the sealing material 29 in a free state is made larger than the inner diameter of the inner end of the outer ring 7 in the axial direction.
- the sealing property of the mounting portion can be ensured by filling a sealing agent (coking agent) such as a gel instead of the sealing material 29 having elasticity as described above.
- a sealing agent such as a gel instead of the sealing material 29 having elasticity as described above.
- the cylindrical portion 20 of the covers 19a and 19b is fitted and fixed to the inner end of the outer ring 7 in the axial direction, the gap 28 is filled with the sealing agent.
- the cylindrical portion 20 can be fitted into the outer ring 7.
- the surface of the covers 19 a and 19 b including the outer peripheral surface of the cylindrical portion 20 is coated with a resin coating film by electrodeposition coating, and this coating is applied to the outer peripheral surface of the cylindrical portion 20 and the outer ring 7.
- FIG. 5 shows a third example of the embodiment of the present invention.
- the recess 30 is formed in the radial center of the cover 19c. Specifically, a portion on the radially inner side of the flat plate portion 21 of the cover 19c is projected outward in the axial direction (inner space side).
- the detected surface of the encoder body 24 faces the outer surface in the axial direction (surface on the inner space side) of the flat plate portion 21.
- the inclination angle ⁇ 1 of the non-contact portion 26a is preferably 5 to 45 degrees, more preferably 10 to 35 degrees, and most preferably 15 to 25 degrees. Accordingly, the cover 19c can be fitted and fixed to the inner end portion in the axial direction of the outer ring 7 while the flatness of the flat plate portion 21 is kept better.
- the inner diameter of the flat plate portion 21 is 25% or more of the diameter D19 of the cover 19c, and the recess 30 is not in contact with the encoder body 24 or the like.
- the angle of the tapered surface that protrudes outward in the axial direction from the flat plate portion 21 of the recess 30 is restricted to a range of 5 to 90 degrees, preferably 20 to 70 degrees in consideration of ease of processing and a deformation preventing effect. Is done.
- FIG. 6 shows a fourth example of the embodiment of the present invention.
- the axial length from the axial inner side surface of the stationary flange 10 is shortened at the axial inner end of the outer ring 7 as compared with the structure of the first example shown in FIG. 1. is doing. That is, in the case of this example, the dimension of the inner end of the outer ring 7 in the axial direction is shortened so that the outer ring 7 does not exist on the radially outer side of the non-contact part 26a of the cover 19a.
- the gap 28 having a wedge-shaped cross section formed between the outer peripheral surface of the non-contact portion 26a of the cover 19a and the inner peripheral surface of the inner end portion of the outer ring 7 (see FIG. 1) disappears. Therefore, it is possible to prevent foreign substances such as water from being held in the gap 28 without providing the sealing material 29 as shown in the first and second modification examples (see FIG. 4). Intrusion of foreign matters such as water and rusting into the rolling bearing unit can be suppressed.
- the structure of this example can be used in combination with the sealing material. In this case, the sealing material is elastically brought into contact with a part of the outer ring 7 such as the inner end face in the axial direction of the outer ring 7 over the entire circumference.
- FIG. 7 shows a fifth example of the embodiment of the present invention.
- the axial length from the axial inner side surface of the stationary side flange 10 is increased at the axial inner end of the outer ring 7 as compared with the structure of the first example shown in FIG. 1. is doing. That is, in the case of this example, the dimension of the inner end portion in the axial direction of the outer ring 7 is increased so as to protrude inward in the axial direction from the flat portion 21 of the cover 19a.
- the axial inner end portion of the outer ring 7 protruding inward in the axial direction plays a role of protecting the cover 19a.
- the axially inner end portion of the protruding outer ring 7 also covers the sensor 4a, the sensor 4a can be protected from dust, stepping stones and the like.
- the combined use with the sealing material is easy, and the sealing material is elastically brought into contact with the inner peripheral surface of the inner end portion in the axial direction of the outer ring 7 over the entire circumference.
- FIG. 8 shows a sixth example of the embodiment of the present invention.
- the axial length from the axial inner side surface of the stationary flange 10 is slightly smaller at the axial inner end of the outer ring 7.
- the dimension of the inner end portion in the axial direction of the outer ring 7 is slightly increased so that it protrudes inward in the axial direction from the flat portion 21 of the cover 19a. Yes.
- the cylindrical portion 20 is fitted and fixed to the axial inner end portion of the outer ring 7 with the axial outer end portion of the cylindrical portion 20 facing the counter bore 32 of the outer ring raceway 9 leaving a gap C.
- the outer surface in the axial direction (surface on the inner space side) of the flat plate portion 21 and the detected surface of the encoder body 24 are closely opposed to each other via the gap A, and a minute gap 25 exists.
- the sensor 4a is supported and fixed to a knuckle (not shown) in a state where the detection surface of the sensor 4a is positioned inward in the axial direction by a gap B with respect to the inner end of the outer ring 7 in the axial direction.
- the combined use with the sealing material is easy, and the sealing material is elastically brought into contact with the inner peripheral surface of the inner end portion in the axial direction of the outer ring 7 over the entire circumference.
- the gap A is 0.5 ⁇ 0.1 mm
- the gap B is 0.1 ⁇ 0.1 mm
- the gap C is 0.25 ⁇ 0.25 mm.
- the gap D is defined as 0.1 ⁇ 0.1 mm
- the gap (B + D) between the sensor 4a and the flat plate portion 21 is defined as 0.2 ⁇ 0.2 mm.
- FIG. 9 and 10 show a seventh example of the embodiment of the present invention.
- the encoder body is formed on the inner surface in the axial direction of the annular portion of the support ring 23 having an L-shaped cross section and the entire annular shape. 24, the axial length of the support ring 23 is small, and the inner ring 12 constituting the hub 6 and the caulking portion 13 of the hub main body 11 are smaller than the detected portion (the inner side surface in the axial direction) of the encoder main body 24. Projects inward in the axial direction.
- the convex part 31 is formed in the radial direction center part of the cover 19d.
- a portion radially inward of the flat plate portion 21 of the cover 19d is protruded inward in the axial direction (external space side).
- the detected surface of the encoder body 24 faces the outer surface in the axial direction (surface on the inner space side) of the flat plate portion 21.
- the rigidity of the flat plate portion 21 can be improved and the flat plate portion 21 can be made a plane with better accuracy, as in the third example of the embodiment.
- the inner diameter of the flat plate portion 21 is 25% or more of the diameter D 19 of the cover 19d.
- the angle of the tapered surface that protrudes inward in the axial direction from the flat plate portion of the convex portion 31 is restricted to a range of 5 to 90 degrees, preferably 20 to 70 degrees in consideration of ease of processing and a deformation preventing effect. Is done.
- a minute gap 25 (the gap between the outer surface in the axial direction (surface on the inner space side) of the flat plate portion 21 of the cover 19d and the detected surface (the inner surface in the axial direction) of the encoder body 24 that is in close proximity to this.
- the clearance a) is set larger (a> b) than the clearance b between the axially outer side surface of the flat plate portion 21 and the axially inner end surface of the inner ring 12 that is in close proximity to the flat surface portion 21.
- the minute space 25 (gap a) is formed between the axially outer side surface of the convex portion 31 of the cover 19d and the axially inner end surface of the caulking portion 13 of the hub body 11 that is close to and opposed thereto. Is set to be larger than the gap c (a> c). As a result, even if the cover 19d is pushed outward in the axial direction, it comes into contact with the portion (point e) closest to the inner end surface in the axial direction of the caulking portion 13 of the convex portion 31 of the cover 19d. The cover 19d does not come into contact with the encoder body 24.
- the minimum value of the clearance a is the change in the relative inclination and displacement of the outer and inner rings when a moment load due to the road surface reaction force is applied to the bearing, and the press-fitting position when the encoder 23a and the cover 19d are press-fitted with the outer ring as a reference.
- the encoder body 24 and the cover 19d are defined so as not to contact each other.
- the gap b is set larger than the gap c (b> c).
- the effects of contact at the point d and contact at the point e are the same, but it is more preferable that the contact be made at the point e where the peripheral speed is lower when the bearing is rotating. Therefore, in the present invention, the relationship between the sizes of these gaps is regulated so that a> b> c, and when the cover 19d is pushed outward in the axial direction, the point e contacts first. Is regulated.
- the combined use with the sealing material is easy, and the sealing material is elastically brought into contact with the inner peripheral surface of the inner end portion in the axial direction of the outer ring 7 over the entire circumference (FIG. 10). reference).
- the feature of this example is that the amount of movement of the flat plate portion 21 in the axial direction when the cover 19d is pushed is determined between the cover 19d and the inner end surface in the axial direction of the hub 6 (the caulking portion 13 of the hub body 11 or the inner ring 12). It is characterized in that it is restricted by the axial clearance existing in Therefore, if any one of the above-described gap relationships (a> b or a> c) is provided, an effect of avoiding contact between the cover 19d and the encoder body 24 can be obtained. Accordingly, it is possible to prevent the encoder 1 that is difficult to determine an appearance abnormality due to the presence of the cover 19d from being moved by the contact with the cover 19d and having a large error in the magnetic signal. Further, this contact prevention effect allows the cover and the bearing to be brought closer to each other than before, so that the hub bearing can be made compact.
- the present invention is a disk-like configuration in which the entire surface extending in the radial direction is a flat plate portion extending to the center portion as in the first example, the second example, the fourth example, the fifth example, and the sixth example. Even in the case where the concave portion 30 is formed in the central portion as in the third example, the case where the convex portion 31 is formed in the central portion as in the seventh example is applicable. Furthermore, the present invention can also be applied to a ring-shaped member having a large circular hole at the center for constituting a rolling bearing unit with an encoder for driving wheels as described in Patent Document 2. It is. Moreover, as long as it is applicable, the characteristics of each example can be applied to other examples.
- the structure in which the concave portion is formed in the central portion of the third example or the structure in which the convex portion is formed in the central portion of the seventh example can be replaced with a structure including only the flat plate portion.
- the third and seventh examples can be replaced with a structure including only a flat plate portion.
- the relationship between the outer ring and the cover shown in the first example, the fourth example, and the fifth example can be applied to other examples, and the clearance regulation shown in the sixth example and the seventh example can be applied to other examples. It is also possible to apply.
- the cover 19c of the third example shown in FIG. 5 was used.
- Cover 19c, the thickness dimension t 19 was produced by using SUS304 material 0.6 mm.
- the cover 19c has an outer diameter D 19 of 57 mm, an axial length L 19 of 7.8 mm, and a tightening value (the absolute difference between the inner diameter of the inner end of the outer ring 7 in the axial direction and the outer diameter D 19 of the cover 19c). Value) was 0.18 mm (180 ⁇ m).
- the cover 19c was provided with a partially conical convex portion having an axial dimension of 2.2 mm and an inclination angle ⁇ of about 20 degrees.
- the cylindrical portion 20 of the cover 19c was fitted into the inner end of the outer ring 7 in the axial direction.
- the amount of deformation of the portion of the flat plate portion 21 facing the detected surface of the encoder body 24 is set to 0 at the specified position in the vicinity of the outer diameter of the flat plate portion, and the amount of bulge or depression is measured with a dial gauge.
- the maximum value of the deformation in the axial direction of this portion was 0.064 mm (64 ⁇ m).
- the cover 19c was removed from the outer ring 7, the position of the contact mark was confirmed, and the axial dimension L26a of the non-contact portion was confirmed. As a result, it was slightly shorter than 2.2 mm. 0.6 mm) was more than twice (actually 3 times).
- the continuous portion of the cylindrical portion 20 and the flat plate portion 21 has a large curvature (before the radius of curvature on the outer diameter side is fitted into the inner end of the outer ring 7 in the axial direction).
- a cover 19 having a conventional structure was obtained under the same conditions as those in the above example except that the bent portion was continuous in a free state (about 1.2 mm).
- the cylindrical portion 20 of the cover 19 was implemented.
- the inner ring 7 was fitted inside the same outer ring 7 as in the example.
- a portion of the flat plate portion 21 facing the detection surface of the encoder main body 24 was deformed in the axial direction by a maximum of 0.144 mm (144 ⁇ m).
- the deformation amount of the flat plate portion of the cover in particular, the portion of the flat plate portion that is close to and opposed to the encoder main body can be suppressed to about 45% of the conventional product. The effect of was confirmed.
- the wheel support rolling bearing unit with an encoder of the present invention can be suitably applied to support the rotation of a wheel.
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Abstract
Description
図1および図2に、本発明の実施の形態の第1例を示す。なお、本例を含めて、本発明のエンコーダ付車輪支持用転がり軸受ユニットの特徴は、各転動体8およびエンコーダ1を設置した内部空間17の軸方向内端開口部を塞ぐために、外輪7の軸方向内端部にカバー19a~19dを内嵌固定することに伴って、このカバー19a~19dを構成する平板部21が厚さ方向(該カバーを含む軸受ユニットの軸方向)に変形することを抑えるための構造にある。その他の部分の構造および作用は、従来のエンコーダ付車輪支持用転がり軸受ユニットと同様であるから、図示並びに説明は、省略もしくは簡略にし、以下、本発明の特徴部分を中心に説明する。
図3に、本発明の実施の形態の第2例を示す。本発明の実施の形態の第2例では、非接触部26bを、軸方向外寄り部分との間に段差部27を介在させた、小径段部により構成している点で第1例と異なっている。この場合においても、非接触部26b(段差部27よりも軸方向内側に存在する円筒状部分)は、上記外輪7の軸方向内端部の内径R7 よりも小さな外径D26(R7 >D26)を有することから、上記外輪7の軸方向内端部に上記カバー19bの円筒部20をこの外輪7の軸方向内端部に内嵌した状態で、この外輪7の内周面と上記非接触部26bの外周面とが当接することはない。なお、本例でも非接触部26bの軸方向寸法L26を、上記カバー19bを構成する板材の厚さ寸法t19 の2倍以上(L26≧t19)、5倍以下(L26≦5t19)とすることが好ましく、さらに好ましくは、L26=(3~4)t19とする。また、この軸方向寸法L26を、このカバー19bの軸方向長さL19の50%以下(L26≦0.5L19)、好ましくは20~35%程度とする。また、この段差部27は、実施例1に示す部分円すい筒状の部分を形成した後、この部分と円筒部20の間の内径側R部と外径側テーパ面を押さえ、かつ、この部分と平板部21との間の内径側R部を支承した上で、軸方向内側からこの部分に向けてパンチを入れて形成する。このため、実施例1と同様に、円筒部側にダレが発生することが抑制される。さらに、非接触部26bの2つの外径側R部の共通接線の、中心軸に対する傾斜角度α2を、好ましくは10~45度、より好ましくは10~35度、最も好ましくは15~25度とする。このような第2例の構造によっても、第1例と同様の作用および効果が得られる。
図5に、本発明の実施の形態の第3例を示す。本例では、カバー19cの径方向中央部に凹部30を形成している。具体的には、カバー19cの平板部21よりも径方向内側にある部分を軸方向外側(内部空間側)に突出させている。なお、エンコーダ本体24の被検出面は、平板部21の軸方向外側面(内部空間側の面)と対向する。このような凹部30を設けることにより、平板部21の剛性を向上させ、平板部21をより精度の良好な平面とすることが可能となる。この場合も、上記非接触部26aの傾斜角度α 1 を、好ましくは5~45度、より好ましくは10~35度、最も好ましくは15~25度とする。これにより、上記平板部21の平面精度をより良好に保ちつつ、上記カバー19cを上記外輪7の軸方向内端部に内嵌固定することが可能になる。なお、平板部21の内径は、カバー19cの直径D19の25%以上であって、かつ、上記凹部30がエンコーダ本体24などに接触しない範囲とする。また、凹部30の平板部21から軸方向外側に突出するテーパ面の角度は、加工容易性と変形防止効果とを考慮して、5~90度、好ましくは、20~70度の範囲に規制される。
図6に、本発明の実施の形態の第4例を示す。図6に示す第4例の場合、図1に示す第1例の構造と比べて、外輪7の軸方向内端部で、静止側フランジ10の軸方向内側面からの軸方向長さを短くしている。すなわち、本例の場合には、上記外輪7の軸方向内端部の寸法を短くして、上記カバー19aの非接触部26aの径方向外側にこの外輪7が存在しないようにしている。このような本例の構造の場合には、第1例において、カバー19aの非接触部26aの外周面と外輪7の内端部内周面との間に形成される断面楔状の隙間28(図1参照)がなくなる。従って、第1例および第2例の変形例(図4参照)に示すようなシール材29を設けなくとも、前記隙間28の部分に、水などの異物が保持されてしまうことを防止でき、転がり軸受ユニット内部への水などの異物の侵入や、発錆を抑制することが可能となる。なお、本例の構造においてもシール材との併用は可能である。この場合、このシール材は、上記外輪7の軸方向内端面など、この外輪7の一部表面に、全周にわたって弾性的に当接させる。
図7に、本発明の実施の形態の第5例を示す。図7に示す第5例の場合、図1に示す第1例の構造と比べて、外輪7の軸方向内端部で、静止側フランジ10の軸方向内側面からの軸方向長さを長くしている。すなわち、本例の場合には、上記外輪7の軸方向内端部の寸法を長くして、上記カバー19aの平面部21よりも軸方向内方に突出するようにしている。このような本例の構造の場合には、軸方向内方に突出した外輪7の軸方向内端部が、カバー19aを保護する役目を果たしており、組立時に誤ってカバー19aを押し込んだり、走行時に飛び石などが衝突してカバー19aを変形させたりすることを防止することが可能となる。さらに、突出した外輪7の軸方向内端部はセンサ4aも覆っているので、センサ4aを塵埃、飛び石などから保護することができる。なお、本例の構造の場合も、シール材との併用は容易であり、シール材は、上記外輪7の軸方向内端部の内周面に全周にわたって弾性的に当接させる。
図8に、本発明の実施の形態の第6例を示す。図8に示す第6例の場合、図1に示す第1例の構造と比べて、外輪7の軸方向内端部で、静止側フランジ10の軸方向内側面からの軸方向長さを僅かに長くしている。すなわち、本例の場合には、上記外輪7の軸方向内端部の寸法を僅かに長くして、上記カバー19aの平面部21よりも軸方向内方に突出量Dだけ突出するようにしている。また、円筒部20の軸方向外端部を外輪軌道9のカウンタボア32に隙間Cを残して対向した状態で、円筒部20は外輪7の軸方向内端部に内嵌固定されている。この時、平板部21の軸方向外側面(内部空間側の面)とエンコーダ本体24の被検出面は隙間Aを介して近接対向して、微小隙間25が存在する。一方、センサ4aの検出面が外輪7の軸方向内端に対して隙間Bだけ軸方向内方に位置する状態で、センサ4aはナックル(図示せず)に支持固定されている。
図9および図10に、本発明の実施の形態の第7例を示す。図9に示す第7例の場合、図1に示す第1例の構造と異なり、エンコーダ1aを断面L字形で全体を円環状とした支持環23の円輪部の軸方向内側面にエンコーダ本体24を取り付けているが、支持環23の軸方向長さは小さく、ハブ6を構成する内輪12およびハブ本体11のかしめ部13が、エンコーダ本体24の被検出部(軸方向内側面)よりも軸方向内方に突出している。本例では、カバー19dの径方向中央部に凸部31を形成している。具体的には、カバー19dの平板部21よりも径方向内側にある部分を軸方向内側(外部空間側)に突出させている。なお、エンコーダ本体24の被検出面は、平板部21の軸方向外側面(内部空間側の面)と対向する。このような凸部31を設けることにより、実施の形態の第3例と同様に、平板部21の剛性を向上させ、平板部21をより精度の良好な平面とすることが可能となる。なお、平板部21の内径は、カバー19dの直径D19の25%以上とする。また、凸部31の平板部から軸方向内側に突出するテーパ面の角度は、加工容易性と変形防止効果とを考慮して、5~90度、好ましくは、20~70度の範囲に規制される。
2 エンコーダ付転がり軸受ユニット
3 ナックル
4、4a センサ
5 転がり軸受ユニット
6 ハブ
7 外輪
8 転動体
9 外輪軌道
10 静止側フランジ
11 ハブ本体
12 内輪
13 かしめ部
14 内輪軌道
15 回転側フランジ
16 保持器
17 内部空間
18 シールリング
19、19a、19b、19c、19d カバー
20 円筒部
21 平板部
22 肩部
23 支持環
24 エンコーダ本体
25 微小隙間
26a、26b 非接触部
27 段差部
28 隙間
29 シール材
30 凹部
31 凸部
32 カウンタボア
Claims (6)
- 内周面に複列の外輪軌道を有し、使用時に懸架装置に支持固定された状態で回転しない外輪と、
外周面に複列の内輪軌道を有し、使用時に車輪を支持固定した状態で、該車輪と共に回転するハブと、
前記両外輪軌道と両内輪軌道との間に、各列に複数個ずつ設けられている、転動体と、
前記ハブに該ハブと同心に支持固定されており、軸方向内側面を円周方向に関して磁気特性が交互に変化する被検出面としているエンコーダと、
非磁性板製で、軸方向に伸長する円筒部と、該円筒部の軸方向内端部から径方向内方に折れ曲がって伸長する平板部を備え、該円筒部を前記外輪の軸方向内端部に締り嵌めで内嵌固定すると共に、前記平板部を前記エンコーダの被検出面に近接対向させている、カバーと、
を備えるエンコーダ付車輪支持用転がり軸受ユニットにおいて、
前記カバーを構成する前記円筒部の軸方向内端部に、該カバーを前記外輪に内嵌固定した場合に該外輪の内周面と接触しない、非接触部が全周にわたって形成されており、該カバーを前記外輪の軸方向内端部に内嵌した状態で、前記円筒部を前記外輪の軸方向内端部に、上記非接触部よりも軸方向外寄り部分でのみ締り嵌めで内嵌していることを特徴とする、エンコーダ付車輪支持用転がり軸受ユニット。 - 前記非接触部が、軸方向内方に向かうに従って直径が小さくなる方向に傾斜した、部分円すい筒状に形成されている、請求項1に記載したエンコーダ付車輪支持用転がり軸受ユニット。
- 前記非接触部が、軸方向外寄り部分との間に段差部を介在させた小径段部により構成されている、請求項1に記載したエンコーダ付車輪支持用転がり軸受ユニット。
- 前記外輪の軸方向内端面が、前記平板部の内端面よりも、軸方向内方に突出している、請求項1に記載のエンコーダ付車輪支持用転がり軸受ユニット。
- 前記エンコーダの被検出面と前記カバーの平板部のうち該エンコーダの被検出面と対向する軸方向外側面との間の隙間を、前記カバーの円筒部の軸方向外端面と前記外輪の外輪軌道よりも軸方向内端寄りに形成され、該カバーの円筒部の軸方向外端面と対向するカウンタボアの軸方向内側面との間の隙間より大きくしている、請求項1に記載のエンコーダ付車輪支持用転がり軸受ユニット。
- 前記エンコーダの被検出面と前記カバーの平板部のうち該エンコーダの被検出面と対向する軸方向外側面との間の隙間を、前記ハブの軸方向内端面と前記カバーのうち該ハブの軸方向内端面と対向する軸方向外側面との間の隙間より大きくしている、請求項1に記載のエンコーダ付車輪支持用転がり軸受ニット。
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BR112012020797-0A BR112012020797B1 (pt) | 2010-07-22 | 2011-02-07 | unidade de mancal de rolamento com codificador para o suporte de uma roda |
JP2012525331A JP5488696B2 (ja) | 2010-07-22 | 2011-02-07 | エンコーダ付車輪支持用転がり軸受ユニット |
US13/641,704 US8882358B2 (en) | 2010-07-22 | 2011-02-07 | Rolling bearing unit with encoder for supporting wheel |
CN201180000026.0A CN102481806B (zh) | 2010-07-22 | 2011-02-07 | 带编码装置的车轮支撑用滚动轴承单元 |
EP11809471.3A EP2596962B1 (en) | 2010-07-22 | 2011-02-07 | Rolling bearing unit with encoder for supporting drive wheel |
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JP2014015208A (ja) | 2014-01-30 |
BR112012020797A2 (pt) | 2016-06-28 |
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EP2596962A4 (en) | 2014-01-08 |
US9091303B2 (en) | 2015-07-28 |
CN105605095A (zh) | 2016-05-25 |
EP2596962A1 (en) | 2013-05-29 |
EP2596962B1 (en) | 2019-09-18 |
US20130209016A1 (en) | 2013-08-15 |
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