WO2011105366A1 - 自動二輪車用車輪の回転速度検出用エンコーダ付玉軸受およびこれを用いた自動二輪車用車輪の回転速度検出装置 - Google Patents
自動二輪車用車輪の回転速度検出用エンコーダ付玉軸受およびこれを用いた自動二輪車用車輪の回転速度検出装置 Download PDFInfo
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- WO2011105366A1 WO2011105366A1 PCT/JP2011/053830 JP2011053830W WO2011105366A1 WO 2011105366 A1 WO2011105366 A1 WO 2011105366A1 JP 2011053830 W JP2011053830 W JP 2011053830W WO 2011105366 A1 WO2011105366 A1 WO 2011105366A1
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- Prior art keywords
- rotation
- ring
- peripheral surface
- encoder
- wheel
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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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
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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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/067—Fixing them in a housing
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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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- 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
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or 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
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/10—Force connections, e.g. clamping
-
- 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
-
- 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
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
- F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
Definitions
- the present invention relates to a ball bearing with an encoder for detecting the rotational speed of a motorcycle wheel, which is used to rotatably support a motorcycle wheel such as a motorcycle or a scooter with respect to a frame and to determine the rotational speed of the wheel. .
- ABS anti-lock brake system
- wheel support ball bearings for motorcycles are considerably smaller than wheel support ball bearings for four-wheeled vehicles, and many wheel support ball bearings for four-wheeled vehicles are inner ring rotating.
- the structure of the rotational speed detection device for a four-wheeled vehicle should be applied to a motorcycle as it is because many of the wheel bearing ball bearings for a two-wheeled vehicle are outer ring rotating types. I can't.
- Patent Documents 1 to 5 For controlling the ABS for a motorcycle, ball bearings with an encoder for detecting the rotational speed of the motorcycle are known, for example, from Patent Documents 1 to 5. Based on the description in Patent Document 4, the structure of the wheel support portion of the motorcycle and the structure of the ball bearing with encoder will be described with reference to FIGS.
- FIG. 16 shows a structure of a portion that rotatably supports the front wheels of a relatively small motorcycle such as a scooter as a first example of the structure of a wheel support for a motorcycle.
- a pair of support plates 2 are fixed in parallel to each other at the lower ends of a pair of left and right forks 1 constituting the suspension device.
- the both ends of the support shaft 3 are supported and fixed between the support plates 2.
- a pair of ball bearings 4, each of which is a single row deep groove type, is installed at two positions in the middle portion of the support shaft 3.
- the inner rings constituting the both ball bearings 4 are fitted on the support shaft 3, and the axial positions of the inner rings are regulated by the inner ring spacers 5a, 5b, and 5c.
- a cylindrical hub 6 is disposed around the support shaft 3 concentrically with the support shaft 3.
- wheel which comprises the said both ball bearing 4 is internally fitted and fixed to the inner peripheral surface near both ends of the said hub 6.
- FIG. 17 shows a structure of a portion that rotatably supports the rear wheel of a relatively small motorcycle as a second example of the structure of the wheel support portion of the motorcycle.
- both ends of the support shaft 3a are supported and fixed between a pair of arms 31 constituting the suspension device.
- three ball bearings 4a to 4c are installed at three positions of the intermediate portion of the support shaft 3a, and the wheel 7a is integrated around the support shaft 3a.
- the hub 6a is concentric with the support shaft 3a and is rotatable.
- FIG. 18 shows one described in Patent Document 4 as an example of a conventionally known ball bearing with an encoder for detecting the rotational speed of a motorcycle wheel.
- This ball bearing with an encoder having a conventional structure is a combination of a single-row deep groove ball bearing 8 and an annular encoder 9.
- the ball bearing 8 has a deep groove type outer ring raceway 10 on the inner peripheral surface, and an outer ring 11 that rotates during use, and a deep groove type inner ring raceway 12 on the outer peripheral surface, and an inner ring 13 that does not rotate during use.
- a plurality of balls 15 provided between the outer ring raceway 10 and the inner ring raceway 12 so as to be able to roll while being held by a cage 14.
- both end openings of the bearing inner space in which these balls 15 are installed are each made of a ring-shaped cored bar 16a, 16b and a seal made of an elastic material. Sealed by seal rings 18a and 18b comprising lips 17a and 17b.
- the encoder 9 is attached and fixed to the outer surface of the cored bar 16a constituting one of the seal rings 18a (right side in FIG. 18).
- the rotation detection sensor 30 constituting the rotation speed detection device in combination with the ball bearing 8 with the encoder is supported by the support shaft 3. Specifically, the sensor 30 is supported on the support shaft 3 by an annular holder member 36. And the detection part of this sensor 30 is supported by the part which opposes the to-be-detected surface (axial direction outer surface) of the encoder 9 incorporated in the said ball bearing 8 with an encoder.
- the encoder 9 in this example is made of a permanent magnet such as a rubber magnet and is magnetized in the axial direction, and the magnetization direction is changed alternately and at equal intervals in the circumferential direction.
- S poles and N poles are arranged alternately and at equal intervals in the circumferential direction on the outer surface in the axial direction of the encoder 9, which is the detected part.
- Such an encoder 9 is attached and fixed concentrically to the core bar 16a on the outer surface in the axial direction of the core bar 16a constituting the seal ring 18a.
- the detection unit of the sensor 30 supported by the holder member 36 is opposed to the detection surface of the encoder 9 in the axial direction through an appropriate detection gap.
- the seal ring 18 a attached with the encoder 9 rotates together with the outer ring 11 fitted and fixed to the hub 6.
- the south pole and the north pole existing on the detection surface of the encoder 9 alternately pass through the portion immediately before the detection portion of the rotation detection sensor 30, and the output signal of the sensor 30 changes.
- the rotational speed of the said wheel is calculated
- Such a ball bearing with an encoder is replaced with one of the pair of ball bearings 4 (for example, right side) incorporated in the structure shown in FIG. If the sensor detection unit incorporated between the peripheral surface and supported by the non-rotating part is opposed to the outer surface of the encoder 9, the rotational speed of the motorcycle wheel including the wheel 7 can be detected. .
- the effect of preventing foreign matter from entering the bearing internal space is not always sufficient. That is, the seal ring 18a attached with the encoder 9 out of the two seal rings 18a and 18b that closes both end openings of the bearing internal space is connected to the shaft of the support shaft 3 in relation to the installation position of the sensor. It is often arranged on the outer end side with respect to the direction. Therefore, the seal ring 18a portion to which the encoder 9 is attached is easily exposed to foreign matters such as muddy water when the motorcycle is running. In the case of the structure shown in FIG.
- Patent Documents 6 to 8 describe a structure in which an encoder is attached and fixed to the outer surface of the rotating-side circular ring portion constituting the slinger among the combined seal rings including the slinger and the seal ring. ing. Patent Document 8 also describes that such a structure can be applied to ABS control of a motorcycle. According to the structure in which the encoder is installed using the slinger of the combined seal ring, the friction between the tip edge of the seal lip and the mating surface is not exposed to the external space, preventing foreign matter from entering the internal space of the bearing. Can be increased. However, Patent Documents 6 to 8 do not describe a specific structure for rotatably supporting the wheels of the motorcycle and detecting the rotational speed of the wheels.
- an optical or capacitance encoder can be used, but a magnetic encoder is usually used.
- a general elastic magnetic material used in a magnetic encoder nitrile rubber containing strontium ferrite is used as a magnetic powder, and the magnetic powder is mechanically oriented by kneading with a roll. It is in a state.
- These ferrite-based magnetic powders have a shape with a relatively small thickness and a high plate-like property so that they are easily oriented by mechanical shear between rolls.
- This strontium ferrite magnetic powder for mechanical orientation has a large amount of barium to improve the plate-like property, and its residual magnetic flux density (Br) is the same as that of strontium ferrite magnetic powder for magnetic orientation.
- the coercive force (bHc) and the intrinsic coercive force (iHc) are higher than those of the strontium ferrite magnetic powder for magnetic field orientation.
- a magnetic encoder made of a ferrite-containing rubber magnet by a conventional mechanical orientation method has a smaller magnetic flux density per pole than a magnetic encoder for a four-wheeled vehicle, so that the rotational speed can be detected accurately.
- reducing the gap prevents contact between the sensor and the magnetic encoder. Therefore, there is a problem that reducing the number of poles cannot sufficiently meet the high resolution requirement of the rotational speed detection device.
- an object of the present invention is to rotatably support a wheel of a motorcycle and to detect the rotational speed of the wheel, and to detect grease existing in the internal space of the ball bearing. It is intended to provide a ball bearing with an encoder for detecting a rotational speed having a compact structure, which can reliably prevent foreign matter existing in a surrounding external space from entering the internal space. .
- the encoder is a magnetic encoder
- the rotation that can detect the rotational speed of the wheel of the motorcycle with high accuracy without reducing the number of poles in the circumferential direction of the magnetic encoder while being small.
- the object is to provide a ball bearing with an encoder for speed detection.
- the rotation-side bearing ring equipped with the encoder is prevented from rotating (creeping) relative to the mating member that supports and supports the rotation-side bearing ring. It is to realize a structure capable of improving the performance.
- a ball bearing with an encoder for detecting the rotational speed of a motorcycle wheel includes a ball bearing with an encoder for detecting the rotational speed of a wheel for a motorcycle, which includes the structures described in Patent Documents 1 to 4, and Similarly, it is configured to include a single row deep groove ball bearing having an outer ring, an inner ring, and a plurality of balls.
- the outer ring is provided with a single-row deep groove type outer ring raceway in the axially middle part of the inner peripheral surface.
- the inner ring includes a single row deep groove type inner ring raceway at an axially intermediate portion of the outer peripheral surface.
- Each of the plurality of balls is provided between the outer ring raceway and the inner ring raceway so as to be able to roll while being held by a cage.
- one of the outer ring and the inner ring is a rotating raceway that is fitted and fixed to a rotating member that rotates together with the wheel of the motorcycle, and the other is fitted and fixed to a stationary member that does not rotate.
- the stationary side ring is used.
- the encoder is made of a ring-shaped member, and the characteristics of the outer surface in the axial direction, which is the detected surface, are changed alternately and at equal intervals in the circumferential direction.
- the encoder is fixed to a rotation-side circumferential surface that is a circumferential surface facing the stationary-side raceway among the inner and outer circumferential surfaces of the rotation-side raceway.
- the ball bearing with an encoder for detecting the rotational speed of the present invention includes a combined seal ring composed of a slinger and a seal ring that closes between an inner peripheral surface of one end of the outer ring and an outer peripheral surface of one end of the inner ring. Then, the encoder is supported and fixed to the slinger so as to be fixed to the rotation side peripheral surface.
- the slinger is formed into an annular shape by bending a metal plate, and a rotation-side cylindrical portion fitted and fixed to the rotation-side peripheral surface, and an axially outer end edge of the rotation-side cylinder portion from the stationary side It is comprised by the rotation side circular ring part bent at right angles toward the bearing ring.
- the seal ring is composed of a core metal and a seal lip.
- the metal core is bent into an annular shape by bending a metal plate, and is fitted and fixed to a stationary side circumferential surface facing the rotating side circumferential surface of both the inner and outer circumferential surfaces of the stationary side race.
- the stationary side cylindrical portion and the rotational side annular portion bent at a right angle from the axial inner end edge of the stationary side cylindrical portion toward the rotational side raceway.
- the seal lip is made of an elastic material, and includes a base end portion that is coupled and fixed to the core metal over the entire circumference, and a distal end edge that is in sliding contact with a part of the slinger over the entire circumference.
- the encoder is attached and fixed over the entire circumference to the outer surface in the axial direction of the rotating-side annular portion.
- a second metal core and a second metal core having a base end fixed to the second metal core are disposed between the inner peripheral surface of the other end of the outer ring and the outer peripheral surface of the other end of the inner ring. It is closed by a second seal ring consisting of a seal lip.
- the encoder is preferably made of a plastic magnet in which magnetic powder is mixed in a synthetic resin.
- the encoder made of plastic magnet is magnetized in the axial direction, and the magnetizing direction changes alternately and at equal intervals with respect to the circumferential direction.
- the encoder is made on the outer surface in the axial direction, which is the detected surface of the encoder. , S poles and N poles are alternately arranged at equal intervals.
- the plastic magnet constituting the encoder is composed of magnetic powder and a binder obtained by adding an impact resistance improver to polyamide resin.
- a rotational speed detection device for a motorcycle wheel includes a central shaft member concentrically provided with a wheel, an outer diameter side member provided concentrically with the central shaft member around the central shaft member, A ball bearing with an encoder for detecting a rotational speed provided between the outer peripheral surface of the central shaft member and the inner peripheral surface of the outer diameter side member, and the encoder provided in the ball bearing with an encoder for detecting the rotational speed A signal that is supported and fixed to a part of the stationary side member that does not rotate among the central shaft member and the outer diameter side member in a state of facing the outer surface in the axial direction, and that changes as the encoder rotates is output.
- a rotation detection sensor it is preferable to apply the above-described ball bearing with an encoder for rotation speed detection according to the present invention as the ball bearing with an encoder for rotation speed detection.
- the outer ring constituting the ball bearing with encoder for detecting the rotational speed is fitted and fixed to the outer diameter side member
- the inner ring constituting the ball bearing is fitted and fixed to the central shaft member.
- One of the outer ring and the inner ring is one of the central shaft and the outer diameter side member, and is fitted to a rotation side member that is a member that rotates with the wheel, and rotates with the wheel. It is a race.
- the other is a stationary side ring that is fitted to the stationary side member and does not rotate.
- the center shaft member and the outer diameter side member among the inner and outer circumferential surfaces of the rotation side race are fitted with a member corresponding to the rotation side member.
- An anti-rotation member is provided on the fitting-side peripheral surface, and the rotation-side bearing ring rotates relative to the rotation-side member based on the engagement between the anti-rotation member and the peripheral surface of the rotation-side member. To prevent that.
- a locking groove is formed over the entire circumference on the fitting side peripheral surface of the rotating side race, and the rotation locking member is attached to the locking groove and freely
- An O-ring in which the diameter of the cross-sectional shape in the state is larger than the depth of the locking groove can be used.
- the O-ring is elastically pressed between the bottom surface of the locking groove and the peripheral surface of the rotation side member in a state where the rotation side race is fitted to the rotation side member.
- the rotation-side race is prevented from rotating with respect to the rotation-side member.
- the fitting side peripheral surface is formed with an eccentric groove in which the center of the bottom surface is eccentric with respect to the center of the fitting side peripheral surface and the depth gradually changes in the circumferential direction
- a retaining ring that is a half-circular ring provided with a projecting portion that protrudes in the radial direction at an intermediate portion in the circumferential direction and that is locked in the eccentric groove.
- the convex portion of the retaining ring is frictionally engaged with the rotation-side circumferential surface, and the circumferential end portion of the retaining ring is wedged between the bottom surface of the eccentric groove and the circumferential surface of the rotation-side member.
- the rotation side race is prevented from rotating with respect to the rotation side member by biting into the shape.
- a locking groove is formed in the axial direction on the peripheral surface of the rotation side member, and the rotation preventing member is supported on the fitting side peripheral surface in a state of projecting radially from the fitting side peripheral surface.
- a locking pin can be used. In this case, the locking pin engages with the locking groove of the rotation side member, thereby preventing the rotation side race from rotating with respect to the rotation side member.
- a locking groove can be formed on the peripheral surface of the fitting side, and a friction ring made of synthetic resin can be attached to the locking groove as the detent member. This configuration also prevents the rotation side raceway from rotating relative to the rotation side member.
- the wheel of the motorcycle is rotatably supported, and the rotational speed of the wheel can be detected.
- the effect of preventing entry of foreign matter into the bearing internal space can be sufficiently improved.
- the grease existing in the bearing inner space is removed from the bearing inner space by closing with a general seal ring. It is possible to effectively prevent the loss.
- the encoder in which the south pole and the north pole are alternately arranged at equal intervals on the outer surface in the axial direction which is the detected surface, the detected characteristic (the characteristic changing portion existing on the detected surface is detected). The reliability regarding the rotation speed detection of the wheel can be ensured.
- the magnetic characteristics can be improved as compared with the rubber magnet by using a plastic magnet made of magnetic powder and plastic as the magnetic encoder.
- a plastic magnet made of magnetic powder and plastic as the magnetic encoder.
- the rotation-side bearing ring to which the encoder is mounted is fitted and supported by the rotation-side bearing ring by providing a rotation-preventing member on the fitting-side peripheral surface of the rotation-side bearing ring with the rotation-side member. It is possible to prevent relative rotation (creep) with respect to the rotating side member, which is a member, and to improve the reliability related to detection of the rotational speed of the wheels of the motorcycle.
- FIG. 1 is a cross-sectional view of a main part showing a first example of an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of relevant parts showing a second example of the embodiment of the present invention.
- FIG. 3 is a cross-sectional view of a main part for explaining a ball bearing with a magnetic encoder for detecting wheel rotational speed for a motorcycle to which a third example of an embodiment of the present invention is applied.
- 4 is a perspective view showing an example of a magnetization pattern of a magnetic encoder provided in the ball bearing with the magnetic encoder shown in FIG.
- FIG. 5 is a cross-sectional view of relevant parts showing a fourth example of the embodiment of the present invention.
- FIG. 1 is a cross-sectional view of a main part showing a first example of an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of relevant parts showing a second example of the embodiment of the present invention.
- FIG. 3 is a cross-sectional view
- FIG. 6 is a cross-sectional view of relevant parts showing a fifth example of the embodiment of the present invention.
- FIG. 7 is a cross-sectional view of relevant parts showing a sixth example of the embodiment of the present invention.
- FIG. 8 is a cross-sectional view of relevant parts showing a seventh example of the embodiment of the present invention.
- FIG. 9 is a cross-sectional view of relevant parts showing an eighth example of the embodiment of the present invention.
- FIG. 10 is a schematic view showing the relationship between an eccentric groove formed on the outer peripheral surface of the outer ring and a retaining ring fitted in the eccentric groove.
- FIG. 11 is a cross-sectional view of main parts showing a ninth example of the embodiment of the present invention.
- FIG. 11 is a cross-sectional view of main parts showing a ninth example of the embodiment of the present invention.
- FIG. 12 is a schematic end view of a ball bearing in which a locking pin is supported on the outer peripheral surface of the outer ring.
- FIG. 13 is principal part sectional drawing which shows the 10th example of embodiment of this invention.
- FIG. 14 is a cross-sectional view of relevant parts showing an eleventh example of the embodiment of the present invention.
- FIG. 15 is a cross-sectional view of relevant parts showing a twelfth example of the embodiment of the present invention.
- FIG. 16 is a cross-sectional view showing a first example of the structure of the rotation support portion of the wheel of the motorcycle.
- FIG. 17 is a cross-sectional view showing a second example of the structure of the wheel support portion of the motorcycle.
- FIG. 18 is a partial cross-sectional view showing an example of a conventionally known ball bearing with an encoder.
- FIG. 19 is a cross-sectional view of a main part showing a state in which a rotational speed detection device is configured by combining an example of a conventionally known ball bearing with an encoder and a rotation detection sensor.
- FIG. 1 shows a first example of an embodiment of the present invention.
- the outer ring rotating type structure in which the wheel 7 (see FIG. 16) constituting the wheel is rotatably supported around the non-rotating support shaft 3.
- the ball bearing with encoder for detecting the rotational speed of the motorcycle wheel of this example is configured by closing one end (the right end in FIG. 1) opening of the bearing inner space 19 of the single row deep groove type ball bearing 8a with a combination seal ring 20.
- a ring-shaped encoder 9a made of a plastic magnet is attached and fixed to a slinger 21 constituting the seal ring 20 over the entire circumference.
- One end means a side of the bearing inner space 19 facing the external space in the present invention, and the other end is a side not facing the external space, more specifically, the hub 6 (see FIG. 16)) is a side facing the inner diameter side space.
- the ball bearing 8 a includes an outer ring 11 a that is a rotation side race, an inner ring 13 a that is a stationary side race, and a plurality of balls 15.
- the outer ring 11a has a single-row deep groove type outer ring raceway 10a at the axially intermediate portion of the inner peripheral surface.
- the inner ring 13a has a single-row deep groove type inner ring raceway 12a at the axially intermediate portion of the outer peripheral surface.
- each ball 15 is provided between the outer ring raceway 10a and the inner ring raceway 12a so as to be able to roll while being held by a cage 14.
- the inner ring 13a is fitted and fixed to the support shaft 3 by an interference fit
- the outer ring 11a is fixed to the hub 6 (see FIG. 16) provided at the center of the wheel 7 by an interference fit.
- the wheel 7 is rotatably supported around the support shaft 3.
- a pair of ball bearings are provided between the outer peripheral surface of the support shaft 3 and the inner peripheral surface of the hub 6 so as to be separated from each other in the axial direction.
- One of these ball bearings (for example, the right side in FIG. 16) is a ball bearing with an encoder for detecting the rotational speed provided with the encoder 9a as in this example, but the other (for example, the left side in FIG. 16). ) Is a general ball bearing (not incorporating an encoder).
- the seal ring outside the axial direction for example, the left side in FIG. 16 among the seal rings that close the opening at both ends of the bearing internal space has excellent sealing performance with respect to mud water resistance and the like.
- a combination seal ring is preferable.
- one end opening facing the outer space in the use state is connected to the other end (the left end in FIG. 1) by the combination seal ring 20.
- the openings are respectively closed by a general seal ring 18b as in the case of the conventional structure shown in FIG.
- the combined seal ring 20 includes the slinger 21 and the seal ring 22.
- the slinger 21 is formed into an annular shape by bending a magnetic metal plate such as a mild steel plate, a martensitic stainless steel plate or a ferritic stainless steel plate into an L-shaped cross section.
- the slinger 21 is fitted and fixed to the inner peripheral surface of the end of the outer ring 11a, which is the peripheral surface of the rotation side.
- the slinger 21 has an outer diameter side cylindrical portion 23 which is a rotation side cylindrical portion, and a rotation side circle which is bent at a right angle from the axial outer end edge of the outer diameter side cylindrical portion 23 inward in the radial direction.
- the outer ring part 24 which is a ring part is provided.
- an outer end means the edge part which exists in the external space side regarding the axial direction of the ball bearing 8a among this cylindrical part.
- the seal ring 22 includes a cored bar 25 and a seal lip 26.
- the metal core 25 is formed by bending a metal plate into an L-shaped cross section to form an annular shape as a whole, and is externally fixed by an interference fit to the outer peripheral surface of the inner ring 13a that is the stationary peripheral surface.
- the seal lip 26 is made of an elastic material such as an elastomer including rubber, and the base end portion is coupled and fixed to the core metal 25 over the entire circumference, and each distal end edge is partly attached to a part of the slinger 21. Is in sliding contact. In the illustrated example, the three leading edges of the seal lip 26 are brought into sliding contact with the inner peripheral surface of the outer diameter side cylindrical portion 23 and the inner side surface of the outer ring portion 24, respectively.
- the encoder 9a is attached and fixed to the outer surface of the outer ring portion 24 of the slinger 21 constituting the combination seal ring 20 as described above.
- various types can be adopted in combination with various sensors.
- a magnetic encoder, an optical encoder, a capacitive encoder, or the like is used.
- a magnetic encoder is generally used, and this magnetic encoder is also used in this example.
- a ferrite-containing rubber magnet using a strontium ferrite magnetic powder, particularly a magnetic powder for machine orientation is used in a magnetic encoder for detecting the rotational speed of a wheel for a four-wheeled vehicle.
- such a ferrite-containing rubber magnet can also be used, but it is preferable to use a plastic magnet in which the above-mentioned magnetic powder is mixed in a synthetic resin, as will be described in detail in a third example described later.
- the magnetic encoder is magnetized in the axial direction.
- the characteristics of the outer surface in the axial direction, which is the detected surface are changed in the circumferential direction. It is changed as well. More specifically, S poles and N poles are arranged alternately and at equal intervals on the outer surface in the axial direction, which is the detected surface of the encoder 9a.
- the grease existing in the bearing inner space is removed from the bearing inner space by closing with a general seal ring. It is possible to effectively prevent the loss.
- a seal ring 18b that closes the other end opening of the bearing internal space 19 of the ball bearing 8 with a rotational speed detection encoder faces the space on the inner diameter side of the hub 6 (see FIG. 16) and faces the external space.
- the installation is optional.
- the seal ring 18b has a ring-shaped second cored bar fixed to the end of the inner peripheral surface of the outer ring 11a that is the rotation side peripheral surface, and a base end fixed to the second cored bar.
- the tip edge is constituted by a seal lip which is in sliding contact with the end of the outer peripheral surface of the inner ring 13a which is the stationary peripheral surface over the entire periphery.
- the ball bearing 8a with the encoder for detecting the rotational speed of the motorcycle wheel of the present example as described above supports the wheel 7 rotatably around the support shaft 3 that does not rotate.
- a sensor holder 29 is fitted and fixed to a portion adjacent to the ball bearing 8a at an intermediate portion of the support shaft 3, and the detection portion of the sensor 30 held by the sensor holder 29 is used as an outer surface in the axial direction of the encoder 9a. Furthermore, they are opposed to each other in the axial direction through a detection gap of about 0.5 to 2 mm.
- FIG. 2 shows a second example of the embodiment of the present invention.
- the present invention is applied to an inner ring rotating type structure in which the rotating shaft 33 is supported on the inner diameter side of the bearing housing 32 is shown.
- the configuration itself of the ball bearing 8a is the same as that of the first example of the embodiment described above.
- the slinger 21a constituting the combination seal ring 20a is externally fitted to the outer peripheral surface of the end portion of the inner ring 13a by an interference fit. It is fixed.
- the core metal 25a constituting the seal ring 22a is internally fitted and fixed to the inner peripheral surface of the end portion of the outer ring 11a by an interference fit. Therefore, in the structure of this example, the outer diameter side cylindrical portion 23a is provided on the core metal 25a, and the inner diameter side cylindrical portion 27a is provided on the slinger 21a.
- the structure of the combination seal ring 20a it is the same as the first example of the above-described embodiment except that the installation position of each part described above is changed in accordance with the change from the outer ring rotating type to the inner ring rotating type. Because of this, overlapping explanation is omitted.
- the encoder 9b is attached and fixed to the outer surface of the outer ring portion 24a constituting the slinger 21a over the entire circumference.
- the sensor 30 is supported by a holding flange 34 provided in the bearing housing 32.
- FIG. 3 shows a third example of the embodiment of the present invention. Since it is basically the same as the conventional structure shown in FIG. 18, the configuration and structure of the encoder 9c, which is a feature of the third example, will be focused on, and description of the other basic structures will be omitted. However, the encoder 9c of this example can also be applied to the structures shown in the first and second examples.
- the seal ring 18b is formed in an annular shape by covering the cored bar 16b as a reinforcing member with an elastic member 35.
- a seal fixing groove 36 is formed on the inner peripheral surface of the end portion in the axial direction of the outer ring 11, and the outer periphery of the seal ring 18 b is fitted into the seal fixing groove 36 using the elasticity of the elastic member. 18 b is fixed to the outer ring 11.
- a seal groove 38 is formed on the outer peripheral surface of both end portions in the axial direction of the inner ring 13, and a seal lip 17b provided on the inner peripheral portion of the seal ring 18b is in sliding contact with the seal groove 38.
- the seal ring 18a with a magnetic encoder has an outer peripheral side peripheral portion 39 fitted to a step portion 37 provided on the inner peripheral surface of the other end portion in the axial direction of the outer ring 11, and an annular plate portion 40.
- ferritic stainless steel SUS430, etc.
- martensitic stainless steel SUS410, etc.
- a corrosion resistance of a certain level or higher depending on the usage environment. It is preferable to use such a magnetic material.
- the magnetic encoder 9c is an annular member in which N poles and S poles are alternately and continuously arranged in the circumferential direction, and is axially outward of the annular plate portion 40 of the cored bar 16a. It is attached to the surface facing.
- a sensor detects the rotation of the outer ring 11 by detecting, as a magnetic pulse, a change in magnetic flux density generated on the detected surface of the magnetic encoder 9c that rotates integrally with the outer ring 11.
- the detected information on the rotational speed is used as appropriate for, for example, brake control performed by calculating a deviation from the rotational speed information determined in advance in the ABS device.
- the sensor only needs to be attached to a fixed (non-rotating) member, and may not be unitized with the ball bearing 8 with a magnetic encoder.
- the cored bar 16a pre-baked with an adhesive is used as a core, and a magnetic material is insert-molded.
- a disk gate type injection molding machine it is preferable to use a disk gate type injection molding machine.
- the molten magnetic material spreads in a disk shape, and then flows into the mold corresponding to the inner diameter thick portion, so that the flake-like magnetic powder contained therein is oriented parallel to the surface.
- the anisotropy becomes closer to perfection.
- the orientation of the weld part is completely anisotropic in the process of gradually increasing the viscosity of the molten magnetic material toward solidification. It is difficult to cause a crack or the like to occur in the welded portion where the magnetic field characteristics are lowered and the mechanical strength is lowered due to long-term use.
- demagnetization is performed with a magnetic field opposite to the magnetization direction when cooling in the mold.
- the adhesive is completely cured, and then further demagnetized to a magnetic flux density of 2 mT or less, more preferably 1 mT or less, using an oil capacitor type demagnetizer.
- gate cutting is performed, and heating is performed at a constant temperature and for a certain time in a thermostatic bath in order to completely cure the adhesive.
- heating at high temperature such as high-frequency heating can be performed for a short time.
- the magnetic encoder is obtained by superposing the magnetizing yoke and multipolarizing the magnet in the circumferential direction (see FIG. 4).
- the magnetic powder that forms the magnetic material includes ferrite-based magnetic powders such as strontium ferrite and barium ferrite, samarium-iron-nitrogen, samarium-cobalt, neodymium-iron-boron, etc. These rare earth magnetic powders can be suitably used. These magnetic powders can be used alone or in combination of two or more. If high magnetic properties (BHmax> 2.0 MGOe) are required, rare earth magnetic powder is used. If low magnetic properties (BHmax 1.6 to 2.0 MGOe) are acceptable, the cost should be considered. Thus, a blend containing ferrite-based magnetic powder as a main component is preferable. The content of the magnetic powder in the magnetic material varies depending on the type of the magnetic powder, but there is no practical problem if it is in the range of 70 to 92% by mass.
- the binder is a polyamide resin added with an impact resistance improver.
- the polyamide resin is a resin excellent in fatigue resistance and heat resistance, and has an effect of improving the thermal shock resistance of the magnet portion.
- the impact resistance improver is an elastic material having a function of relaxing vibration and impact, and the following resins and rubber materials can be preferably used in the present invention.
- Modified polyamide resin can be used as an impact resistance improver.
- This modified polyamide resin is a block copolymer having a hard segment made of a polyamide resin and a soft segment made of at least one of a polyester component and a polyether component, and commercially available products include polyamide 6, polyamide 11, polyamide 12 and the like. Modified polyamide resins having a hard segment as a hard segment are known.
- particles composed of styrene butadiene rubber, acrylic rubber, acrylonitrile butadiene rubber, carboxyl modified acrylonitrile butadiene rubber, silicon rubber, chloroprene rubber, hydrogenated nitrile rubber, carboxy modified hydrogenated nitrile rubber, carboxyl modified styrene butadiene rubber are preferable. These are used singly or in combination.
- ethylene propylene non-conjugated diene rubber EPDM
- maleic anhydride-modified ethylene propylene non-conjugated diene rubber EPDM
- ethylene / acrylate copolymer ionomer and the like
- the addition amount of these impact resistance improvers is preferably 5 to 50% by mass and more preferably 10 to 40% by mass with respect to the total amount with the polyamide resin. If the addition amount is less than 5% by mass, it is too small, and the effect of improving impact resistance is small, which is not preferable. When the addition amount exceeds 50% by mass, although the impact resistance is improved, the amount of the polyamide resin is relatively reduced, the tensile strength is lowered, and the practicality is lowered.
- a phenol resin adhesive, an epoxy resin adhesive, etc. which can be diluted with a solvent and proceed in a curing reaction close to two stages, are preferable.
- These adhesives have the advantage of being excellent in heat resistance, chemical resistance, handling properties, and the like.
- the magnetic encoder 9c is fixedly attached to the cored bar 16a by multi-magnetization after a magnetic material is insert-molded using the cored bar 16a as a core.
- the cored bar 16a and the magnetic encoder 9c are shown. And the cored bar 16a and the magnetic encoder 9c may be joined with an adhesive, and then multipolar magnetization may be performed.
- FIG. 15 shows a fourth example of the embodiment of the present invention.
- Locking grooves 42 are formed on the outer peripheral surface of the outer ring 11b, which is the rotation side raceway, over the entire circumference.
- an O-ring 43 is attached to the locking groove 42.
- the O-ring 43 has a cross-sectional diameter in a free state shown in FIG. 15 larger than the depth of the locking groove 42. Therefore, before the outer ring 11b is fitted into the hub 6, the outer diameter side end of the O-ring 43 protrudes radially outward from the outer peripheral surface of the outer ring 11b.
- the O-ring 43 is elastically formed between the bottom surface of the locking groove 42 and the inner peripheral surface of the hub 6 with the outer ring 11b fitted into the hub 6 by interference fit. Pressed. In this state, a large frictional force acts between these bottom surface and inner peripheral surface and both the inner and outer peripheral surfaces of the O-ring 43. As a result, even if the tightening margin of the fitting portion between the hub 6 and the outer ring 11b is reduced or eliminated, the outer ring 11b equipped with the encoder 9 rotates relative to the hub 6 rotating together with the wheel (creep). There is no longer to do. As a result, the rotational speeds of the wheels and the encoder 9 can be made to completely coincide with each other, so that the reliability related to the rotational speed detection of the wheels of the motorcycle can be improved.
- a locking groove 42a is also formed on the inner peripheral surface of the inner ring 13b, and the O-ring 43a is also locked to this locking groove 42a.
- the O-ring 43a is elastically pressed between the outer peripheral surface of the support shaft 3 and the bottom surface of the locking groove 42a in a state where the inner ring 13b is externally fixed to the support shaft 3 by an interference fit. is doing.
- the O-ring 43 prevents relative rotation of the outer ring 11b (and the encoder 9 supported and fixed to the outer ring 11b) with respect to the hub 6, and the O-rings 43, 43a.
- the sealing performance between the inner peripheral surface of the hub 6 and the outer peripheral surface of the outer ring 11b and between the inner peripheral surface of the inner ring 13b and the outer peripheral surface of the support shaft 3 is ensured.
- FIG. 6 shows a fifth example of the embodiment of the present invention.
- two locking grooves 42 are formed on the outer peripheral surface of the outer ring 11c
- two locking grooves 42a are formed on the inner peripheral surface of the inner ring 13c.
- O-rings 43 and 43a are attached to 42 and 42a, respectively.
- the creep preventing effect of the outer ring 11c with respect to the hub 6 can be improved as compared with the fourth example of the above-described embodiment, and the inner peripheral surface of the hub 6 and the outer ring 11c can be improved.
- the sealability between the outer peripheral surface of the inner ring 13 c and the inner peripheral surface of the inner ring 13 c and the outer peripheral surface of the support shaft 3 can be more sufficiently ensured.
- FIG. 7 shows a sixth example of the embodiment of the present invention.
- the locking grooves 42 and 42a are formed on the outer peripheral surface of the outer ring 11d and the inner peripheral surface of the inner ring 13d, respectively.
- O-rings 43 and 43a are mounted in the grooves 42 and 42a, respectively.
- FIG. 8 shows a seventh example of the embodiment of the invention.
- the locking grooves 42 and 42a are formed on the outer peripheral surface of the outer ring 11e and the inner peripheral surface of the inner ring 13e, respectively.
- O-rings 43 and 43a are mounted in the grooves 42 and 42a, respectively.
- FIG. 9 to 10 show an eighth example of the embodiment of the present invention.
- An eccentric groove 44 is formed on the outer peripheral surface of the outer ring 11f which is a rotation side raceway ring.
- the center of the bottom surface 45 is eccentric with respect to the center of the outer peripheral surface of the outer ring 11f, and the depth gradually changes in the circumferential direction.
- a retaining ring 46 is engaged with the eccentric groove 44.
- This retaining ring 46 is obtained by bending a linear material having a rectangular cross section, such as stainless spring steel, and is slightly larger than a semicircular shape (the central angle is slightly larger than 180 degrees). It is.
- the thickness t of the wire in the radial direction is larger than the depth d of the shallowest portion of the eccentric groove 44 and smaller than the depth D of the deepest portion (d ⁇ t ⁇ D).
- the circumferential central portion of the retaining ring 46 is bent with a larger curvature than the other portions, and an elastic convex portion 47 protruding radially outward is formed in the portion.
- the height H from the inner peripheral surface of the retaining ring 46 to the top of the elastic convex portion 47 in the free state, which is indicated by a chain line in FIG. 10, is larger than the depth D of the deepest portion of the eccentric groove 44. Large (H> D).
- the outer ring 11 f When the outer ring 11 f is fitted and fixed to the hub 6 (see FIG. 16), first, the retaining ring 46 is locked in the eccentric groove 44, and the elastic convex portion 47 is formed in the eccentric groove 44. Position it at the deepest part. Then, as shown by a solid line in FIG. 10, the elastic convex portion 47 is crushed radially inward so that the top portion of the elastic convex portion 47 does not protrude radially outward from the outer peripheral surface of the outer ring 11f. The outer ring 11f is fitted into the hub 6 with an interference fit. In the state of being fitted, the top portion of the elastic convex portion 47 elastically contacts the inner peripheral surface of the hub 6.
- the elastic convex portion 47 is stretched between the inner peripheral surface of the hub 6 and the bottom surface 45 of the eccentric groove 44, and the outer ring 11f is rotated with respect to the hub 6 by a large frictional force.
- the circumferential end of the retaining ring 46 is formed in a shallow portion of the eccentric groove 44. It is displaced and bites in a wedge shape between the bottom surface 45 of the eccentric groove 44 and the inner peripheral surface of the hub 6.
- the thickness of the retaining ring 46 in the radial direction is constant over the circumferential direction.
- the central axis of the outer peripheral surface and the central axis of the inner peripheral surface are eccentric, and the thickness in the radial direction is the largest at the central portion in the circumferential direction.
- an eccentric ring that becomes smaller toward the ends in the direction.
- the amount of eccentricity of such an eccentric ring is made substantially equal to or slightly smaller than the amount of eccentricity between the outer peripheral surface of the outer ring 11f and the bottom surface 45 of the eccentric groove 44. If the eccentric ring is used, the wedge action when the outer ring 11f and the hub 6 tend to rotate increases, and the effect of preventing the relative rotation (creep) between the outer ring 11f and the hub 6 is further improved. growing.
- FIG. 16 a locking groove (not shown) is opened on the inner peripheral surface of the hub 6 (see FIG. 16) to which the outer ring 11g is to be fitted and fixed, in an axial direction and on the axial end surface of the hub 6. Forming. Then, the outer ring 11g is fitted into the hub 6 with an interference fit, and at the same time, the locking pin 48 is engaged with the locking groove. As a result, the outer ring 11g is prevented from rotating with respect to the hub 6.
- FIG. 13 shows a tenth example of the embodiment of the present invention.
- locking grooves 49 are formed at two positions in the axial direction on the outer peripheral surface of the outer ring 11h, and a synthetic resin friction ring 50 is locked in each of the locking grooves 49.
- Both the friction rings 50 are rectangular in cross section and formed into an annular shape as a whole.
- the friction rings 50 are provided with cuts at one place in the circumferential direction so that they can be attached to the locking grooves 49.
- the linear expansion coefficients of the two friction rings 50 are the iron alloy or aluminum wire constituting the outer ring 11h and the hub 6 (see FIG. 16) for fitting and fixing the outer ring 11h. Greater than expansion coefficient. For this reason, when the temperature rises, both the friction rings 50 thermally expand larger than the outer ring 11h and the hub 6, and both the inner and outer peripheral surfaces of these friction rings 50 are connected to the bottom surfaces of the both locking grooves 49 and the It is strongly pressed against the inner peripheral surface of the hub 6. As a result, a large frictional force acts between these surfaces, and the outer ring 11h is prevented from rotating with respect to the hub 6.
- FIG. 14 shows an eleventh example of the embodiment of the present invention.
- an eccentric groove 44 is formed on the outer peripheral surface of the outer ring 11i, and the structure of the eighth example in which the retaining ring 46 is locked to the eccentric groove 44. It is applied.
- FIG. 15 shows a twelfth example of the embodiment of the present invention.
- an eccentric groove 44 is formed on the inner peripheral surface of the inner ring 13j, and the retaining ring 46 is locked in the eccentric groove 44. Is applied.
Abstract
Description
図1は、本発明の実施の形態の第1例を示している。本例は、図16に示した従来構造の1例と同様に、回転しない支持軸3の周囲に、車輪を構成するホイール7(図16参照)を回転自在に支持する、外輪回転型の構造に関する。本例の自動二輪車用車輪の回転速度検出用エンコーダ付玉軸受は、単列深溝型の玉軸受8aの軸受内部空間19の一端(図1の右端)開口を組み合わせシールリング20により塞ぎ、この組み合わせシールリング20を構成するスリンガ21に、プラスチック磁石製で円輪状のエンコーダ9aを、全周にわたって添着固定している。なお、一端とは、軸受内部空間19の両端のうち、本発明では外部空間に対向する側を意味し、他端とは、外部空間に対向しない側、より具体的には、ハブ6(図16参照)の内径側空間などに対向する側を意味する。
図2は、本発明の実施の形態の第2例を示している。本例の場合には、軸受ハウジング32の内径側に回転軸33を支持した、内輪回転型の構造に本発明を適用した場合について示している。玉軸受8aの構成自体は、上述した実施の形態の第1例の場合と同様である。同様の構成の玉軸受8aを使用して内輪回転型の構造を実現するために、本例では、組み合わせシールリング20aを構成するスリンガ21aを内輪13aの端部外周面に、締り嵌めにより外嵌固定している。また、シールリング22aを構成する芯金25aを外輪11aの端部内周面に、締り嵌めにより内嵌固定している。このために本例の構造では、外径側円筒部23aを前記芯金25aに、内径側円筒部27aを前記スリンガ21aに、それぞれ設けている。前記組み合わせシールリング20aの構造に関する限り、外輪回転型から内輪回転型に変更することに伴って、上述した各部の設置位置を変更した点以外は、上述した実施の形態の第1例と同様であるから、重複する説明は省略する。
図3は、本発明の実施の形態の第3例を示している。基本的には、図18に示した従来の構造と同様であるから、第3例の特徴であるエンコーダ9cの構成および構造に焦点をあて、その他の基本的な構造についての説明は省略する。ただし、本例のエンコーダ9cを第1例および第2例に示した構造にも適用することは可能である。
図15は、本発明の実施の形態の第4例を示している。回転側軌道輪である外輪11bの外周面に係止凹溝42を全周にわたって形成している。そして、この係止凹溝42に、Oリング43を装着している。このOリング43は、図15に示した自由状態での断面形状の直径が、前記係止凹溝42の深さよりも大きい。したがって、前記外輪11bをハブ6に内嵌する以前の状態で、前記Oリング43の外径側端部は、この外輪11bの外周面よりも径方向外方に突出する。このため、このOリング43は、この外輪11bを前記ハブ6に、締り嵌めで内嵌した状態で、前記係止凹溝42の底面とこのハブ6の内周面との間で弾性的に押圧される。この状態では、これら底面および内周面と、前記Oリング43の内外両周面との間に大きな摩擦力が作用する。この結果、前記ハブ6と前記外輪11bとの嵌合部の締め代が低下ないしは消失しても、エンコーダ9を装着したこの外輪11bが、車輪と共に回転する前記ハブ6に対し相対回転(クリープ)することがなくなる。この結果、この車輪と前記エンコーダ9との回転速度を完全に一致させて、自動二輪車の車輪の回転速度検出に関する信頼性の向上を図れる。
図6は、本発明の実施の形態の第5例を示している。本例の場合には、外輪11cの外周面に2本の係止凹溝42を、内輪13cの内周面に2本の係止凹溝42aを、それぞれ形成し、これら各係止凹溝42、42aに、それぞれOリング43、43aを装着している。このような本例の構造によれば、上述した実施の形態の第4例に比べて、ハブ6に対する外輪11cのクリープ防止効果を向上させられると共に、このハブ6の内周面と前記外輪11cの外周面との間、並びに、前記内輪13cの内周面と支持軸3の外周面との間のシール性を、より十分に確保できる。
図7は、本発明の実施の形態の第6例を示している。本例の場合には、実施の形態の第1例の構造において、その外輪11dの外周面と内輪13dの内周面にそれぞれ係止凹溝42、42aをそれぞれ形成し、これら各係止凹溝42、42aに、それぞれOリング43、43aを装着している。
図8は、本発明の実施の形態の第7例を示している。本例の場合には、実施の形態の第2例の構造において、その外輪11eの外周面と内輪13eの内周面にそれぞれ係止凹溝42、42aをそれぞれ形成し、これら各係止凹溝42、42aに、それぞれOリング43、43aを装着している。
図9~10は、本発明の実施の形態の第8例を示している。回転側軌道輪である外輪11fの外周面に、偏心溝44を形成している。この偏心溝44は、底面45の中心がこの外輪11fの外周面の中心に対し偏心しており、深さが円周方向に関して漸次変化する。そして、前記偏心溝44に、止め輪46を係止している。この止め輪46は、ステンレスのばね鋼のような、断面矩形で線状の素材を曲げ形成することにより得られ、半円形よりも少し大きな(中心角が180度よりも少し大きな)、C字形である。前記線材の、径方向に関する厚さtは、前記偏心溝44の最も浅い部分の深さdよりも大きく、最も深い部分の深さDよりも小さい(d<t<D)。また、前記止め輪46の周方向中央部を他の部分よりも大きな曲率で曲げ形成して、当該部分に径方向外方に突出する弾性凸部47を形成している。前記止め輪46の内周面から、図10に鎖線で表した、この弾性凸部47の自由状態での頂部までの高さHは、前記偏心溝44の最も深い部分の深さDよりも大きい(H>D)。
図11~12は、本発明の実施の形態の第9例を示している。本例の場合には、外輪11gの外周面に係止ピン48を、この外周面から径方向外方に突出する状態で支持している。このため、前記外輪11gの一部外周面に形成した凹孔に、スプリングピンを圧入固定する。一方、この外輪11gを内嵌固定すべきハブ6(図16参照)の内周面に係止溝(図示省略)を、軸方向に、かつ、このハブ6の軸方向端面に開口する状態で形成している。そして、このハブ6に前記外輪11gを、締り嵌めで内嵌すると同時に、前記係止ピン48を前記係止溝と係合させる。この結果、前記外輪11gが前記ハブ6に対し回転することを防止する。
図13は、本発明の実施の形態の第10例を示している。本例の場合には、外輪11hの外周面の軸方向2箇所位置に係止溝49を形成し、これら両係止溝49に、それぞれ合成樹脂製の摩擦リング50を係止している。これら両摩擦リング50は、断面形状が矩形で全体を円環状としたもので、円周方向に関して1箇所に切れ目を設けて、前記両係止溝49への装着を可能にしている。そして、前記両摩擦リング50をこれら両係止溝49に装着した状態で、これら両摩擦リング50の外周面と前記外輪11hの外周面とが、単一円筒面上に位置するか、あるいは、この外輪11hの外周面よりもわずかに突出するようにしている。
図14は、本発明の実施の形態の第11例を示している。本例の場合、実施の形態の第1例の構造において、外輪11iの外周面に、偏心溝44を形成し、この偏心溝44に、止め輪46を係止する、第8例の構造を適用したものである。
図15は、本発明の実施の形態の第12例を示している。本例の場合、実施の形態の第2例の構造において、内輪13jの内周面に、偏心溝44を形成し、この偏心溝44に、止め輪46を係止する、第8例の構造を適用したものである。
2 支持板
3、3a 支持軸
4、4a、4b、4c 玉軸受
5a、5b、5c 内輪間座
6、6a ハブ
7、7a ホイール
8、8a、8b、8c、8d、8e、8f、8g、8h、8i、8j エンコーダ付玉軸受
9、9a、9b、9c エンコーダ
10、10a 外輪軌道
11、11a、11b、11c、11d、11e、11f、11g、11h、11i、11j 外輪
12、12a 内輪軌道
13、13a、13b、13c、13d、13e、13f、13g、13h、13i、13j 内輪
14 保持器
15 玉
16a、16b 芯金
17a、17b シールリップ
18a、18b シールリング
19 軸受内部空間
20、20a 組み合わせシールリング
21、21a スリンガ
22、22a シールリング
23、23a 外径側円筒部
24、24a 外側円輪部
25、25a 芯金
26、26a シールリップ
27、27a 内径側円筒部
28、28a 内側円輪部
29 センサホルダ
30、30a センサ
31 アーム
32 軸受ハウジング
33 回転軸
34 保持フランジ
35 弾性部材
36 シール固定溝
37 段部
38 シール溝
39 外径側周縁部
40 環状板部
41 ホルダ部材
42 係止凹溝
43 Oリング
44 偏心溝
45 底面
46 止め輪
47 弾性凸部
48 係止ピン
49 係止溝
50 摩擦リング
Claims (10)
- 内周面の軸方向中間部に単列深溝型の外輪軌道を有する外輪と、外周面の軸方向中間部に単列深溝型の内輪軌道を有する内輪と、これらの外輪軌道と内輪軌道との間に、保持器により保持された状態で転動自在に設けられた複数個の玉とを備え、前記外輪と前記内輪とのうちの一方を自動二輪車の車輪と共に回転する回転側部材に嵌合固定される回転側軌道輪とし、他方を回転しない静止側部材に嵌合固定される静止側軌道輪とする、単列深溝型玉軸受と、
前記回転側軌道輪の内外両周面のうちで前記静止側軌道輪に対向する周面である回転側周面に固定され、被検出面である軸方向外側面の特性を円周方向に関して交互かつ等間隔に変化させている、エンコーダと、
前記外輪の一端部内周面と前記内輪の一端部外周面との間を塞ぐ、スリンガとシールリングとからなる組み合わせシールリングと、
を備え、かつ、
前記エンコーダを前記スリンガに支持固定することにより、前記回転側周面に固定している、
自動二輪車用車輪の回転速度検出用エンコーダ付玉軸受。 - 前記スリンガは、金属板を折り曲げて全体を円環状とし、前記回転側周面に嵌合固定される回転側円筒部と、該回転側円筒部の軸方向外端縁から前記静止側軌道輪に向け直角に折れ曲がった回転側円輪部とからなり、
前記シールリングは、芯金とシールリップとからなり、
該芯金は、金属板を折り曲げて全体を円環状とし、前記静止側軌道輪の内外両周面のうちで前記回転側周面と対向する静止側周面に嵌合固定される静止側円筒部と、該静止側円筒部の軸方向内端縁から前記回転側軌道輪に向け直角に折れ曲がった回転側円輪部とからなり、
前記シールリップは、弾性材製であって、前記芯金に全周にわたって結合固定される基端部と、前記スリンガの一部に全周にわたって摺接する先端縁とからなり、
前記エンコーダは、前記回転側円輪部の軸方向外側面に、全周にわたって添着固定されている、
請求項1に記載した自動二輪車用車輪の回転速度検出用エンコーダ付玉軸受。 - 前記外輪の他端部内周面と前記内輪の他端部外周面との間を、第2の芯金と、この第2の芯金に基端部を固定された第2のシールリップとからなる、第2のシールリングにより塞いでいる、請求項1または2に記載した自動二輪車用車輪の回転速度検出用エンコーダ付玉軸受。
- 前記エンコーダが、合成樹脂中に磁性粉末を混入したプラスチック磁石製であって、軸方向に着磁されると共に、着磁方向が円周方向に関して交互かつ等間隔に変化しており、前記エンコーダの被検出面である軸方向外側面に、S極とN極とが交互かつ等間隔に配置されている、請求項1~3のうちの何れか1項に記載した自動二輪車用車輪の回転速度検出用エンコーダ付玉軸受。
- 前記エンコーダが、磁性体粉と、ポリアミド樹脂に耐衝撃性向上剤を添加したバインダとからなるプラスチック磁石製である、請求項4に記載した自動二輪車用車輪の回転速度検出用エンコーダ付玉軸受。
- 車輪と同心に設けられた中心軸部材と、該中心軸部材の周囲に、該中心軸部材と同心に設けられた外径側部材と、該中心軸部材の外周面と該外径側部材の内周面との間に設けられた、請求項1~5の何れかに記載した回転速度検出用エンコーダ付玉軸受と、該回転速度検出用エンコーダ付玉軸受に備えられた前記エンコーダの前記軸方向外側面に対向した状態で、前記中心軸部材と前記外径側部材のうち前記静止側部材に相当する部材の一部に支持固定され、前記エンコーダの回転に伴って変化する信号を出力する回転検出センサと、を備え、かつ、
前記回転側軌道輪の内外両周面のうちで、前記中心軸部材と前記外径側部材のうち前記回転側部材に相当する部材と嵌合する嵌合側周面に、回り止め部材が設けられており、該回り止め部材と前記回転側部材の周面との係合に基づき、該回転側軌道輪が該回転側部材に対し回転することを防止している、
自動二輪車の車輪用回転速度検出装置。 - 前記回転側軌道輪の前記嵌合側周面に全周にわたって係止凹溝が形成されており、前記回り止め部材が、該係止溝に装着され、自由状態での断面形状の直径が該係止凹溝の深さよりも大きいOリングであり、前記回転側軌道輪を前記回転側部材に嵌合した状態で、該Oリングを、前記係止凹溝の底面と該回転側部材の周面との間で弾性的に押圧することにより、前記回転側軌道輪が該回転側部材に対し回転することを防止している、請求項6に記載した自動二輪車の車輪用回転速度検出装置。
- 前記嵌合側周面に、底面の中心が該嵌合側周面の中心に対し偏心して、深さが円周方向に関して漸次変化する偏心溝が形成されており、前記回り止め部材が、周方向の中間部に径方向に突出する凸部を設けた欠円環状で、前記偏心溝に係止された止め輪であり、該止め輪の凸部を前記回転側周面と摩擦係合させると共に、該止め輪の周方向端部を、前記偏心溝の底面と前記回転側部材の周面との間にくさび状に食い込ませることにより、前記回転側軌道輪が該回転側部材に対し回転することを防止している、請求項6に記載した自動二輪車の車輪用回転速度検出装置。
- 前記嵌合側周面に、係止ピンが、該嵌合側周面から径方向に突出する状態で支持されており、該係止ピンが、前記回転側部材の周面に軸方向に形成された係止溝と係合することにより、前記回転側軌道輪が該回転側部材に対し回転することを防止している、請求項6に記載した自動二輪車の車輪用回転速度検出装置。
- 前記嵌合側周面に、係止溝が形成されており、該係止溝に、合成樹脂製の摩擦リングを装着した、請求項6に記載した自動二輪車の車輪用回転速度検出装置。
Priority Applications (3)
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EP11747327A EP2541088A1 (en) | 2010-02-23 | 2011-02-22 | Ball bearing equipped with encoder for detecting rotational speed of wheel of two-wheeled motor vehicle, and device for detecting rotational speed of wheel of two-wheeled motor vehicle, the device using the ball bearing |
US13/391,914 US20120204638A1 (en) | 2010-02-23 | 2011-02-22 | Ball bearing with a rotational speed detection encoder for a motorcycle and a rotational speed detection device for a motorcycle using this encoder |
CN2011800034939A CN102483094A (zh) | 2010-02-23 | 2011-02-22 | 机动两轮车用车轮的转速检测用的带编码器的球轴承以及使用了该球轴承的机动两轮车用车轮的转速检测装置 |
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JP2010037041A JP2011174482A (ja) | 2010-02-23 | 2010-02-23 | 自動二輪車用車輪の回転速度検出用エンコーダ付玉軸受 |
JP2010-120368 | 2010-05-26 | ||
JP2010120368A JP2011247336A (ja) | 2010-05-26 | 2010-05-26 | 自動二輪車用の車輪回転速度検出用磁気エンコーダ付玉軸受 |
JP2011-032002 | 2011-02-17 | ||
JP2011031849A JP2012172686A (ja) | 2011-02-17 | 2011-02-17 | 自動二輪車の車輪用回転速度検出装置 |
JP2011032002A JP2012172692A (ja) | 2011-02-17 | 2011-02-17 | 自動二輪車の車輪用回転速度検出装置 |
JP2011-031849 | 2011-02-17 |
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US (1) | US20120204638A1 (ja) |
EP (1) | EP2541088A1 (ja) |
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JP5944703B2 (ja) * | 2012-03-14 | 2016-07-05 | 株式会社ケーヒン | 回転角度検出装置 |
JP2014224546A (ja) * | 2013-05-15 | 2014-12-04 | 日本精工株式会社 | 組み合わせシールリング付転がり軸受ユニット |
WO2015010735A1 (en) * | 2013-07-24 | 2015-01-29 | Aktiebolaget Skf | Sensor-bearing unit, mechanical system comprising at least one such unit and mounting method |
EP3040698B1 (en) * | 2013-11-21 | 2018-02-14 | NSK Ltd. | Torque measurement unit for electric power steering device and method of assembling same |
IT201700083818A1 (it) | 2017-07-24 | 2019-01-24 | Skf Ab | Ruota fonica per gruppo mozzo-ruota |
US10866257B2 (en) * | 2017-11-21 | 2020-12-15 | Aktiebolaget Skf | Wheel hub bearing provided with a device for measuring the rotational speed |
FR3088975B1 (fr) * | 2018-11-23 | 2020-12-04 | Vibracoustic Nantes Sas | Bague de palier de suspension pour véhicule automobile comprenant une portion sacrificielle |
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