CN211820436U - Bearing cap with sensor unit and hub unit bearing - Google Patents
Bearing cap with sensor unit and hub unit bearing Download PDFInfo
- Publication number
- CN211820436U CN211820436U CN201920994227.0U CN201920994227U CN211820436U CN 211820436 U CN211820436 U CN 211820436U CN 201920994227 U CN201920994227 U CN 201920994227U CN 211820436 U CN211820436 U CN 211820436U
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- insertion hole
- ring
- bearing cap
- holder
- axially
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Images
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
- F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
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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
-
- 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
-
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/02—Housings
- G01P1/026—Housings for speed measuring devices, e.g. pulse generator
-
- 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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- 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
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/10—Force connections, e.g. clamping
- F16C2226/12—Force connections, e.g. clamping by press-fit, e.g. plug-in
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Sealing Of Bearings (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The present invention relates to a bearing cap with a sensor unit, which is formed by mounting a sensor unit on a bearing cap for closing an opening of an outer ring of a hub unit bearing, and a hub unit bearing having the bearing cap. An O-ring is disposed in a radially compressed state between an inner peripheral surface of an axially intermediate portion of the holder insertion hole and an outer peripheral surface of an axially intermediate portion of the holder shaft portion. An annular recess is provided on the inner peripheral surface of the holder insertion hole over the entire circumference in a range from the axially inner side opening to a position adjacent to the axially inner side of the O-ring arrangement position (P). The inner diameter of the annular recess is larger than the outer diameter of the O-ring fitted around the retainer shaft before the O-ring is inserted into the retainer insertion hole. With this configuration, not only can the sealing performance between the holder insertion hole and the holder shaft portion be ensured, but also the mounting workability of the sensor holder can be improved, and the thickness of the bottom portion of the holder insertion hole can be reduced to improve the rotational speed detection accuracy.
Description
Technical Field
The present invention relates to a bearing cap with a sensor unit, which is formed by mounting the sensor unit on a bearing cap for closing an opening of an outer ring of a hub unit bearing, and a hub unit bearing having the bearing cap with the sensor unit.
Background
Conventionally, a rotation speed detection device for detecting a rotation speed of a wheel necessary for controlling an ABS or the like is combined with a hub unit bearing for rotatably supporting a wheel of an automobile or the like with respect to a suspension device. Patent document 1 describes a structure in which an annular encoder constituting a rotation speed detecting device is supported by an axially inner portion of a hub constituting a hub unit bearing, and a sensor unit constituting the rotation speed detecting device is attached to a bearing cover closing an axially inner opening of an outer ring constituting the hub unit bearing.
In the conventional structure, a retainer insertion hole that penetrates in the axial direction is provided in a portion of the bearing cap that faces a portion in the circumferential direction of the encoder in the axial direction. A holder shaft portion for holding the sensor at the distal end portion is inserted into the holder insertion hole. Thereby, the detection unit of the sensor is brought into close opposition to the detection surface of the encoder. Further, an O-ring made of an elastic material is interposed between the outer peripheral surface of the holder shaft portion and the inner peripheral surface of the holder insertion hole.
However, the hub unit bearing of the structure described in patent document 1 is used in a severe muddy water environment, and when the sealing performance by the O-ring is insufficient, muddy water may penetrate into the space inside the bearing cap through the retainer insertion hole which is the through-hole.
However, in the structure described in patent document 2, when moisture that has entered between the holder insertion hole and the holder shaft portion freezes, there is a possibility that the bottom portion of the holder insertion hole may be damaged. Therefore, it is necessary to secure the strength of the bottom of the holder insertion hole, and it is difficult to make the thickness of the bottom of the holder insertion hole thin. As a result, the distance (air cap) between the detection portion of the sensor and the detection surface of the encoder increases, and the amount of magnetic flux that enters and exits from the detection surface of the encoder and passes through the detection portion of the sensor decreases, which may reduce the accuracy of the rotation speed detection by the sensor.
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-53638
Patent document 2: japanese patent laid-open publication No. 2016-136064
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to solve the above-described problems and to provide a structure of a bearing cap with a sensor unit, which can ensure sealing between a holder insertion hole and a holder shaft portion and can reduce the thickness of the bottom of the holder insertion hole to improve the rotational speed detection accuracy.
In order to solve the above problem, the bearing cap with the sensor unit according to the present invention includes a bearing cap, a sensor unit, and an elastic ring. The bearing cover has a bottomed cylindrical shape, is attached to an axially inner portion of an outer ring rotatably supported on a hub having an encoder, and closes an axially inner opening of the outer ring. The bearing cap has a fitting cylinder portion fitted and fixed to the outer ring, and a synthetic resin bottom plate portion for closing an inner diameter side of the fitting cylinder portion, and the bottom plate portion is provided with a retainer insertion hole having a bottom hole, which is opened only on an inner side in the axial direction, in a portion facing a part of the encoder in the axial direction. The sensor unit includes a sensor holder having a holder shaft portion inserted into the holder insertion hole and attached to the bearing cap, and a sensor held at a tip end portion of the holder shaft portion. The elastic ring is disposed between an inner peripheral surface of an axially intermediate portion of the retainer insertion hole and an outer peripheral surface of an axially intermediate portion of the retainer shaft portion in a radially compressed state.
The present invention further provides a bearing cap with a sensor unit, wherein the retainer insertion hole has an air escape portion in a range from an axial inner side opening to a position adjacent to an axial inner side of an arrangement position of the elastic ring in at least a part of a circumferential direction of an inner circumferential surface, and an inner radius of the air escape portion is larger than an outer radius of the elastic ring externally fitted to the retainer shaft portion before being inserted into the retainer insertion hole.
The utility model discloses a wheel hub unit bearing possesses: an outer ring having an outer ring raceway on an inner circumferential surface; a hub having an inner raceway on an outer circumferential surface thereof; a plurality of rolling bodies arranged between the outer ring raceway and the inner ring raceway; an encoder supported coaxially with the hub on an axially inner side portion of the hub; a bearing cover mounted on the axial inner side of the outer ring; and a sensor unit mounted to the bearing cap.
The utility model discloses an among the wheel hub unit bearing, the bearing cap of taking the sensor unit that will install the sensor unit and form on the bearing cap is as the utility model discloses a take the bearing cap of sensor unit and provide.
According to the present invention, not only can the sealing performance between the holder insertion hole and the holder shaft portion be ensured, but also the mounting workability of the sensor holder with respect to the bearing cap can be improved, and the thickness of the bottom of the holder insertion hole is made thinner to improve the rotational speed detection accuracy.
Drawings
Fig. 1 is a cross-sectional view showing a hub unit bearing with a rotational speed detecting device according to embodiment 1 of the present invention.
Fig. 2 is an enlarged view of the vicinity of the retainer insertion hole of fig. 1.
Fig. 3 is a sectional view showing a hub unit bearing with a rotation speed detecting device according to embodiment 1 with a bearing cap removed.
Fig. 4 is a view of the bearing cap as viewed from the left side of fig. 3.
Fig. 5 is a view of the bearing cap as viewed from the right side of fig. 3.
Fig. 6(a) is a view showing an earlier stage in which the O-ring is present on the inner diameter side of the tapered surface, for explaining a step of inserting the holder shaft portion externally fitted with the O-ring into the holder insertion hole.
Fig. 6(B) is a diagram illustrating a middle stage in which the O-ring is present on the inner diameter side of the guide tapered surface, in the step of inserting the holder shaft portion externally fitted with the O-ring into the holder insertion hole.
Fig. 6(C) is a diagram illustrating a later stage in the process of inserting the holder shaft portion, to which the O-ring is externally fitted, into the holder insertion hole, showing that the O-ring is present on the inner diameter side of the support cylindrical surface.
Fig. 7 is an enlarged view of the vicinity of the retainer insertion hole according to embodiment 2 of the present invention.
Fig. 8 is an enlarged view of the vicinity of the retainer insertion hole according to embodiment 3 of the present invention.
Detailed Description
Embodiment 1 will be described with reference to fig. 1 to 6.
The hub unit bearing 8 of the present embodiment is configured to rotatably support a wheel with respect to a suspension device, and to detect the rotational speed of the wheel, and includes an outer ring 9, a hub 10 that rotates together with the wheel, a plurality of rolling elements 11, an outer seal member 12, a bearing cap 13, a rotational speed detector 14, and an O-ring 15 that is an elastic ring.
The axially outer side of the hub unit bearing 8 is the left side of fig. 1 to 3 and 6 that is the widthwise outer side of the vehicle when the hub unit bearing is assembled to the vehicle, and the axially inner side is the right side of fig. 1 to 3 and 6 that is the widthwise center side of the vehicle when the hub unit bearing is assembled to the vehicle.
The outer ring 9 has a plurality of outer ring raceways 16a and 16b on the inner peripheral surface and a stationary flange 17 on the outer peripheral surface. The stationary flange 17 is provided at an axially intermediate portion of the outer ring 9 so as to project radially outward. The outer ring 9 is used to fix the stationary flange 17 to a suspension device such as a knuckle and does not rotate in a use state. The outer ring 9 is made of, for example, medium carbon steel such as S53C.
The hub 10 is disposed coaxially with the outer ring 9 on the inner diameter side of the outer ring 9, and is configured by combining a hub ring 18 and an inner ring 19. The hub wheel 18 is a shaft member that externally fits and holds the inner race 19, and includes a shaft portion 20 and a rotating flange 21. The shaft portion 20 is provided in a range from an axially inner portion to an axially intermediate portion of the hub wheel 18. The shaft portion 20 has a small-diameter stepped portion 22 at an axially inner portion for externally fitting the inner ring 19, and an axially outer-row inner ring raceway 23a at an axially intermediate portion on an outer peripheral surface thereof. A caulking portion 24 bent radially outward is formed at an axially inner portion of the shaft portion 20, and the caulking portion 24 presses an axially inner end surface of the inner ring 19. The rotating flange 21 protrudes radially outward from an axially outer side portion of the hub wheel 18 adjacent to an axially outer side of the shaft portion 20, and has a substantially circular wheel shape. The inner ring 19 is fitted to the small diameter stepped portion 22 of the hub wheel 18, and has an inner ring raceway 23b arranged axially inward on the outer peripheral surface. The hub 10 has a rim and a braking rotor that constitute a wheel fixed to a rotating flange 21 and rotates when in use. The hub wheel 18 is made of medium carbon steel such as S53C, for example, and the inner ring 19 is made of high carbon chromium bearing steel such as SUJ2, for example.
The rolling elements 11 are rollably held by a retainer, not shown, and are disposed between the outer ring raceways 16a and 16b and the inner ring raceways 23a and 23 b. Thus, the hub 10 is rotatably supported on the inner diameter side of the outer ring 9.
Grease, not shown, is sealed in a space 25 which is present between the inner peripheral surface of the outer ring 9 and the outer peripheral surface of the hub 10 and in which the plurality of rolling elements 11 are provided. Further, the outer seal member 12 closes the axial outer opening of the space 25 in order to prevent grease sealed in the space 25 from leaking to the outside and prevent foreign matter such as muddy water from entering the space 25. On the other hand, a cylindrical bearing cover 13 having a bottom is attached to an axially inner portion of the outer ring 9, and closes an axially inner opening of the outer ring 9.
The bearing cap 13 is composed of a substantially disc-shaped cap body 26 made of synthetic resin, and a metal ring 27 and a nut 28 which are mold-fixed to the cap body 26, and has a substantially cylindrical fitting cylinder portion 29 and a substantially disc-shaped bottom plate portion 30 which closes the inner diameter side of the fitting cylinder portion 29.
The cap body 26 is manufactured by injection molding (axial stretch molding) synthetic resin. As the synthetic resin constituting the cover main body 26, for example, a fiber-reinforced polyamide resin material obtained by appropriately adding glass fibers to a polyamide 66 resin can be used. Further, if necessary, the water resistance can be improved by appropriately adding an amorphous aromatic polyamide resin (modified polyamide 6T/6I) and a low water absorption aliphatic polyamide resin (polyamide 11 resin, polyamide 12 resin, polyamide 610 resin, and polyamide 612 resin) to the polyamide resin.
A metal ring 27 made of a stainless steel plate, a rolled steel plate, or the like is molded and fixed to a radially outer portion of the cover main body 26. The metal ring 27 has a substantially L-shaped cross-sectional shape, and includes a cylindrical portion 31 and an outward flange portion 32 bent radially outward from an axially inner portion of the cylindrical portion 31. The cylindrical portion 31 projects axially outward from the radially outer portion of the cover main body 26, and constitutes the fitting cylindrical portion 29 of the bearing cover 13. The outward flange portion 32 is embedded in the radially outer portion of the cap main body 26. An axially outer surface of the radially outer portion of the cap body 26 is formed with an engagement groove 33 over the entire circumference. The locking groove 33 is locked with an O-ring 34.
The portion of the cover body 26 that is radially inward of the portion where the metal ring 27 is molded closes the inner diameter side of the metal ring 27, and constitutes a bottom plate portion 30 of the bearing cover 13. The bottom plate portion 30 has a thickened portion 35 whose axial thickness (wall thickness) is larger than that of the other portions. The thickened portion 35 is provided in a portion that is located vertically above and at the front-rear direction center of the bottom plate portion 30 in a state where the hub unit bearing 8 is assembled to the vehicle.
A holder insertion hole 36 having a bottomed hole, which is opened only inward in the axial direction, is provided at a portion of the thickened portion 35, which is axially opposed to a part of the detection surface of an encoder 42, which will be described later. The holder insertion hole 36 is closed at the inner portion by a bottom 37. Radially inside the thickened portion 35, a pocket-shaped nut 28 is molded and fixed. The nut 28 has a female screw portion 38 formed on an inner peripheral surface thereof and an engaging recess 39 formed on an outer peripheral surface thereof. A part of the synthetic resin constituting the thickened portion 35 is inserted inside the engaging recess 39. A cut-away portion 40 that opens only on the axial outer side is provided in a portion of the radially intermediate portion of the thickened portion 35 that is sandwiched between the holder insertion hole 36 and the nut 28.
A plurality of ribs 41a, 41b are provided on the axially outer surface of the bottom plate portion 30. The rib 41a has a flat plate shape and is provided to extend in the radial direction from the center of the bottom plate 30. The rib 41b has a cylindrical shape and is disposed coaxially with the bottom plate 30.
The bearing cap 13 as described above is attached to the axially inner portion of the outer ring 9 by fitting and fixing the fitting cylindrical portion 29 formed of the cylindrical portion 31 of the metal ring 27 into the axially inner portion of the outer ring 9 by interference fit. Further, the axial outer surface of the radially outer portion of the cover main body 26 abuts against the axial inner end surface of the outer ring 9, whereby the bearing cover 13 is positioned with respect to the outer ring 9 in the axial direction. Further, by elastically sandwiching the O-ring 34 between the axial inner end surface of the outer ring 9 and the bottom surface of the locking groove 33 of the cover main body 26, foreign matter such as moisture is prevented from penetrating through the contact portion between the axial outer surface of the radial outer side portion of the cover main body 26 and the axial inner end surface of the outer ring 9 and entering the inside of the bearing cap 13.
The rotation speed detection device 14 has an encoder 42 and a sensor unit 43.
The encoder 42 has an annular shape, and is supported and fixed on an outer peripheral surface of an axially inner portion of the inner ring 19 constituting the hub 10 in a state of being coaxial with the hub 10. The encoder 42 has a support ring 44 and an encoder body 45. The support ring 44 is made of a magnetic metal plate and is manufactured by press working. The support ring 44 has a substantially L-shaped cross-sectional shape, and is fitted and fixed to the axially inner side portion of the inner ring 19 by interference fit. The encoder body 45 is made of a permanent magnet such as a rubber magnet or a plastic magnet in which a magnetic material such as ferrite powder is mixed, and is fixed to an axial inner surface of the support ring 44. On the inner surface in the axial direction of the encoder main body 45, that is, the surface to be detected, S poles and N poles are alternately arranged at equal intervals in the circumferential direction.
The sensor unit 43 is attached to the bearing cap 13, and includes a sensor holder 46 and a sensor 47 made of synthetic resin. The sensor holder 46 has a cylindrical (rod-shaped) holder shaft portion 48, and a mounting flange portion 49 provided on the base end side of the holder shaft portion 48. The outer diameter of the retainer shaft portion 48 is not changed in the axial direction except for a portion where a locking groove 51 described later is formed. The sensor 47 is composed of a magnetic detection element such as a hall IC, a hall element, an MR element, or a GMR element, and an IC incorporating a wave-shaped circuit, and is held (molded) at the distal end portion of the holder shaft portion 48.
The sensor unit 43 is attached to the bearing cap 13 by screwing the male screw portion of a bolt, not shown, inserted into the through hole 50 provided in the attachment flange portion 49 with the female screw portion 38 of the nut 28 molded in the bottom plate portion 30. In this mounted state, the holder shaft portion 48 is inserted inside the holder insertion hole 36. The sensor 47 held by the distal end portion of the holder shaft portion 48 is axially closely opposed to the detection surface of the encoder 42 (encoder main body 45) via the bottom portion 37 of the holder insertion hole 36.
In order to ensure the sealing property between the holder insertion hole 36 and the holder shaft portion 48, the O-ring 15 is disposed between the inner circumferential surface of the axially intermediate portion of the holder insertion hole 36 and the outer circumferential surface of the axially intermediate portion of the holder shaft portion 48 in a radially compressed state, that is, with interference between the inner circumferential surface of the holder insertion hole 36 and the outer circumferential surface of the holder shaft portion 48. In the present embodiment, in order to enable the insertion operation of the holder shaft portion 48 and the operation of disposing the O-ring 15 at the desired disposition position P at the same time, the O-ring 15 is fitted (locked) to the outer surface of the annular locking groove 51 having a substantially rectangular cross-sectional shape formed in the outer peripheral surface of the axially intermediate portion of the holder shaft portion 48. The O-ring 15 is made of an elastic material such as rubber, and has a substantially circular cross-sectional shape in a free state, and the wire diameter is larger than the groove depth of the locking groove 51. The arrangement position P of the O-ring 15 is an axial position where the center of the O-ring 15 is located when the insertion operation of the holder shaft portion 48 is completed.
In the present embodiment, when the holder shaft portion 48, to which the O-ring 15 is externally fitted, is inserted into the holder insertion hole 36, the shape of the inner peripheral surface of the holder insertion hole 36 is improved so that the air inside the holder insertion hole 36 is released to the outside without excessively compressing the air inside the holder insertion hole 36.
Specifically, the range from the axially outer portion to the intermediate portion including the arrangement position P of the O-ring 15 in the inner peripheral surface of the retainer insertion hole 36 is set as the support cylindrical surface 52 having no change in the inner diameter in the axial direction. The inner diameter D52 of the support cylindrical surface 52 is set to be slightly larger than the outer diameter D48 of the holder shaft portion 48 and smaller than the outer diameter D15 (hereinafter referred to as "ring outer diameter before diameter reduction D15". refer to fig. 6 a) of the O-ring 15 fitted around the holder shaft portion 48 before insertion into the holder insertion hole 36 (D48 < D52 < D15). Thus, in a state where the O-ring 15 is disposed on the inner diameter side of the support cylindrical surface 52, the O-ring 15 can be compressed, and the front portion of the holder shaft portion 48 is prevented from wobbling inside the support cylindrical surface 52.
In addition, in the inner peripheral surface of the holder insertion hole 36, an annular recess 53 as an air escape portion having an inner diameter D53 larger than the before-reduced ring outer diameter D15 (inner radius D53/2 is the outer radius D15/2 of the O-ring 15) is provided over the entire circumference in a range from the axially inner side opening to a position adjacent to the axially inner side of the arrangement position P of the O-ring 15. The bottom surface (inner circumferential surface) of the annular recess 53 is formed as a tapered surface 54 inclined in such a direction that the inner diameter increases toward the axially inner side (the opening side of the holder insertion hole 36). The axial length (depth from the mouth) of the annular recess 53 (tapered surface 54) is determined by the relationship with the arrangement position P of the O-ring 15, but may be, for example, about 20% to 40% of the axial depth of the holder insertion hole 36. Further, the inclination angle of the tapered surface 54 cannot be made excessively steep because the wall thickness (outer wall) around the holder insertion hole 36 is thin, and can be made, for example, about 0.5 ° to 5 ° from the viewpoint that the inner diameter of the opening of the tapered surface 54 is larger than the outer diameter of the O-ring 15 locked in the locking groove 51 of the holder shaft portion 48, from the viewpoint that the holder shaft portion 48 locked with the O-ring 15 can be smoothly inserted into the holder insertion hole 36, and from the viewpoint that a sufficient amount of compression is given to the O-ring 15 after the insertion operation of the holder shaft portion 48 is completed.
Further, a guide tapered surface 55 is provided at an axially intermediate portion of the inner peripheral surface of the holder insertion hole 36, at a portion between the support cylindrical surface 52 and the tapered surface 54. The guide tapered surface 55 is a portion that comes into contact with the outer peripheral surface of the O-ring 15 fitted around the holder shaft portion 48 when the holder shaft portion 48 is inserted into the holder insertion hole 36, as will be described later, and has the same inclination angle as the tapered surface 54, and is smoothly continuous with the tapered surface 54. The inner diameter d55 of the guide tapered surface 55 becomes smaller toward the axially outer side. That is, the axially outer portion of the guide tapered surface 55 is continuous with the support cylindrical surface 52, and the inner diameter d55 of the axially outer end portion is the same as the inner diameter d52 of the support cylindrical surface 52. On the other hand, the guide tapered surface 55 is connected to the tapered surface 54 at the axially inner side portion, and the inner diameter D55 of the axially inner end portion is the same as the before-diameter-reduction ring outer diameter D15. Further, the inclination angle of the guide tapered surface 55 can be made different from the inclination angle of the tapered surface 54.
According to the hub unit bearing 8 of the present embodiment as described above, the wheel can be rotatably supported with respect to the suspension device, and the rotation speed of the wheel can be detected.
In particular, in the present embodiment, not only can the sealing property between the holder insertion hole 36 and the holder shaft portion 48 be ensured, but also the workability of mounting the sensor holder 46 to the bearing cap 13 can be improved, and the thickness of the bottom portion 37 of the holder insertion hole 36 can be reduced to improve the rotational speed detection accuracy by the sensor 47.
That is, the O-ring 15 is disposed with interference between the inner peripheral surface of the axially intermediate portion of the holder insertion hole 36 and the outer peripheral surface of the axially intermediate portion of the holder shaft portion 48, whereby the intrusion of moisture into the inner side (axially outer side) of the portion where the O-ring 15 is sandwiched can be prevented. Therefore, the bottom 37 of the holder insertion hole 36 can be prevented from being damaged by freezing of moisture.
The reason why the mounting workability of the sensor holder 46 can be improved, and the rotation speed detection accuracy by the sensor 47 can be improved by reducing the thickness of the bottom portion 37 of the holder insertion hole 36 is described in detail with reference to fig. 6(a), 6(B), and 6(C) showing the mounting work of the sensor holder 46 in the order of steps.
As shown in fig. 6(a), when the holder shaft portion 48 to which the O-ring 15 is externally fitted is inserted into the holder insertion hole 36, a gap 56 can be provided between the outer peripheral surface of the O-ring 15 and the tapered surface 54 at a stage when the O-ring 15 is positioned on the bottom surface of the annular recess 53, that is, on the inner diameter side of the tapered surface 54. Thus, when the retainer shaft portion 48 is further inserted until the outer peripheral surface of the O-ring 15 abuts against the guide tapered surface 55 as shown in fig. 6(B), the air inside the retainer insertion hole 36 can be released to the outside through the gap 56. Further, since the tapered surface 54 is provided to a position adjacent to the inside in the axial direction of the arrangement position P of the O-ring 15, the amount of insertion of the holder shaft portion 48 from the time when the O-ring 15 abuts against the guide tapered surface 55 to the time when the O-ring moves to the arrangement position P is sufficiently short as shown in fig. 6(B) → 6 (C). Therefore, the air inside the holder insertion hole 36 can be prevented from being excessively compressed. This prevents the holder shaft portion 48 from being pushed back, and improves the workability of mounting the sensor holder 46. Further, since it is not necessary to increase the strength (thickness) of the bottom portion 37 of the holder insertion hole 36 in order to receive compressed air pressure, the thickness of the bottom portion 37 can be reduced, and the rotational speed detection accuracy by the sensor 47 can be improved.
The tapered surface 54 has a function of guiding (guiding) the tip end portion of the holder shaft portion 48, and thus the holder shaft portion 48 can be smoothly inserted into the opening portion of the holder insertion hole 36. Further, the O-ring 15 passing through the tapered surface 54 can be gradually reduced in diameter by the guide tapered surface 55 having the same inclination angle as the tapered surface 54. This allows the O-ring 15 to be smoothly pushed into the inner diameter side of the support cylindrical surface 52. Therefore, the workability of mounting the sensor holder 46 can be improved from this aspect as well.
In the present embodiment, an annular recess 53a having an inner diameter D53a larger than the before-diameter-reduced ring outer diameter D15 (inner radius D53a/2 is the outer radius D15/2 of the O-ring 15) is provided over the entire circumference in the range from the axially inner side opening to the position adjacent to the axially inner side of the arrangement position P of the O-ring 15 in the inner circumferential surface of the holder insertion hole 36 a. The bottom surface (inner circumferential surface) of the annular recess 53a is a cylindrical surface 57 having a constant inner diameter in the axial direction. The support cylindrical surface 52 and the cylindrical surface 57 are continuous via a step surface 58.
In the case of the present embodiment described above, when the holder shaft portion 48 to which the O-ring 15 is fitted is inserted into the holder insertion hole 36a, a gap 56 can be provided between the outer peripheral surface of the O-ring 15 and the cylindrical surface 57 which is the bottom surface of the annular recess 53a, as indicated by the two-dot chain line. This allows air in the holder insertion hole 36a to pass through the gap 56 and to be released to the outside. Further, if the inner diameter D53a of the cylindrical surface 57 is set to be slightly larger than the ring outer diameter D15 before diameter reduction, the cylindrical surface 57 can also be used as an induction surface for centering the O-ring 15 (centering of the holder insertion hole 36a and the holder shaft portion 48).
Further, the support cylindrical surface 52 and the cylindrical surface 57 may be continuous by a guide tapered surface having an inner diameter that becomes smaller toward the axial outer side, or may be continuous by a convex curved surface having an arc-shaped cross-sectional shape, as in the structure of embodiment 1.
Other configurations and operational effects are the same as those of embodiment 1.
Embodiment 3 will be described with reference to fig. 8.
In the present embodiment, a groove 59 extending in the axial direction is provided in a radially outward recessed state in a range from the axially inward opening to a position adjacent to the axially inward side of the arrangement position P of the O-ring 15 in a part of the inner peripheral surface of the holder insertion hole 36b in the circumferential direction. The inner radius D53b of the groove 59 is larger than the outer radius D15/2 of the elastic ring 15 fitted around the holder shaft portion 48 before it is inserted into the holder insertion hole 36 b. The bottom surface of the groove 59 is a partially cylindrical surface 57a having a constant inner diameter in the axial direction. The support cylindrical surface 52 and the partial cylindrical surface 57a are continuous via the step surface 58 a. Further, the relief portion (continuous portion) between the support cylindrical surface 52 and the step surface 58a and the relief portion between the circumferential side surface of the groove 59 and the portion deviated from the groove 59 in the circumferential direction are formed as a convex curved surface 60 having a circular arc-shaped cross-sectional shape, and the O-ring 15 is prevented from being damaged by the relief portion. Instead of the convex curved surface 60, an inclined surface having a gradually changing inner diameter may be provided.
In the case of the present embodiment as described above, when the holder shaft portion 48 to which the O-ring 15 is fitted is inserted into the holder insertion hole 36b, the gap 56 can be provided between a part of the outer peripheral surface of the O-ring 15 (the lower side portion in fig. 8) and the bottom surface of the recessed groove 59, that is, the partial cylindrical surface 57 a. This allows air in the holder insertion hole 36b to pass through the gap 56 and to be released to the outside.
Other configurations and operational effects are the same as those of embodiment 1.
In the case of implementing the present invention, the shape of the annular recessed portion formed in the inner peripheral surface of the holder insertion hole and the bottom surface of the recessed groove is not limited to the tapered surface or the cylindrical surface (partial cylindrical surface), and other shapes may be adopted. In addition, when the recessed groove is formed in the inner peripheral surface of the holder insertion hole, the number of the recessed grooves is not limited to one, and a plurality of recessed grooves may be formed. In the embodiment, the bearing cap has been described by taking as an example a structure in which a synthetic resin cap body and a metal ring or other member made of a material other than synthetic resin are combined, but when the present invention is implemented, the entire bearing cap may be made of synthetic resin. Further, the configurations of the respective embodiments can be implemented in appropriate combinations.
Claims (6)
1. A bearing cap with a sensor unit is characterized by comprising:
a bottomed cylindrical bearing cap attached to an axially inner portion of an outer ring rotatably supporting a hub having an encoder, the bearing cap having a fitting cylinder portion fitted and fixed to the outer ring and closing an axially inner opening of the outer ring, and a synthetic resin-made bottom plate portion closing an inner diameter side of the fitting cylinder portion, the bottom plate portion being provided with a retainer insertion hole having a bottomed hole, which is opened only axially inward, in a portion axially opposed to a part of the encoder;
a sensor unit having a sensor holder having a holder shaft portion inserted into the holder insertion hole and attached to the bearing cap, and a sensor held at a tip end portion of the holder shaft portion; and
an elastic ring disposed between an inner peripheral surface of an axially intermediate portion of the retainer insertion hole and an outer peripheral surface of an axially intermediate portion of the retainer shaft portion in a radially compressed state,
the retainer insertion hole has an air escape portion in a range from an axially inner side opening to a position adjacent to an axially inner side of an arrangement position of the elastic ring in at least a part of an inner circumferential surface in a circumferential direction, and an inner radius of the air escape portion is larger than an outer radius of the elastic ring externally fitted to the retainer shaft portion before the elastic ring is inserted into the retainer insertion hole.
2. The bearing cap with sensor unit according to claim 1,
the air escape portion is an annular recess provided over the entire circumference on the inner circumferential surface of the retainer insertion hole.
3. The bearing cap with sensor unit according to claim 2,
the bottom surface of the annular recess is a tapered surface inclined in a direction in which the inner diameter increases toward the axially inner side.
4. The bearing cap with sensor unit according to claim 2,
the bottom surface of the annular recess is a cylindrical surface having a constant inner diameter in the axial direction.
5. The bearing cap with sensor unit according to claim 1,
the air escape portion is a recessed groove provided in a part of the circumferential direction of the inner circumferential surface of the retainer insertion hole.
6. A hub unit bearing is provided with: an outer ring having an outer ring raceway on an inner circumferential surface; a hub having an inner raceway on an outer circumferential surface thereof; a plurality of rolling elements disposed between the outer race raceway and the inner race raceway; an encoder supported coaxially with the hub on an axially inner side portion of the hub; a bearing cover mounted on an axially inner side portion of the outer ring; and a sensor unit mounted to the bearing cap, the hub unit bearing being characterized in that,
a sensor-unit-equipped bearing cap in which the sensor unit is attached to the bearing cap is the sensor-unit-equipped bearing cap according to any one of claims 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018126087A JP7107032B2 (en) | 2018-07-02 | 2018-07-02 | Bearing cap with sensor unit and hub unit bearing |
| JP2018-126087 | 2018-07-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211820436U true CN211820436U (en) | 2020-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920994227.0U Active CN211820436U (en) | 2018-07-02 | 2019-06-28 | Bearing cap with sensor unit and hub unit bearing |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7107032B2 (en) |
| CN (1) | CN211820436U (en) |
| DE (1) | DE202019103600U1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6899462B1 (en) * | 2020-02-21 | 2021-07-07 | Ntn株式会社 | Bearing caps for wheel bearings with rotational speed detectors, and wheel bearings with rotational speed detectors |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5334699B2 (en) * | 2009-06-18 | 2013-11-06 | Ｎｔｎ株式会社 | Wheel bearing device with rotation speed detector |
| JP2013053638A (en) * | 2011-09-01 | 2013-03-21 | Ntn Corp | Wheel bearing device with rotation speed detector |
| CN205244148U (en) | 2015-01-20 | 2016-05-18 | 日本精工株式会社 | Strip sensor's bearing cap and antifriction bearing unit |
-
2018
- 2018-07-02 JP JP2018126087A patent/JP7107032B2/en active Active
-
2019
- 2019-06-28 CN CN201920994227.0U patent/CN211820436U/en active Active
- 2019-07-01 DE DE202019103600.1U patent/DE202019103600U1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE202019103600U1 (en) | 2019-08-02 |
| JP2020003055A (en) | 2020-01-09 |
| JP7107032B2 (en) | 2022-07-27 |
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