CN210118363U - Hub unit bearing - Google Patents
Hub unit bearing Download PDFInfo
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- CN210118363U CN210118363U CN201920773263.4U CN201920773263U CN210118363U CN 210118363 U CN210118363 U CN 210118363U CN 201920773263 U CN201920773263 U CN 201920773263U CN 210118363 U CN210118363 U CN 210118363U
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- China
- Prior art keywords
- ring
- axially
- encoder
- seal
- hub
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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
- F16C33/7896—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members with two or more discrete sealings arranged in series
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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
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
- F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
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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
- F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B27/00—Hubs
- B60B27/0073—Hubs characterised by sealing means
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- 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
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
- F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
- F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
- F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
- F16C19/386—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings in O-arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Sealing Of Bearings (AREA)
Abstract
The present invention relates to a hub unit bearing for rotatably supporting a wheel of an automobile with respect to a suspension device. The inner seal member includes: the encoder includes an inner seal ring having an inner seal portion, an inner slinger, and a magnetic rubber encoder supported by the inner slinger. The outer seal member includes: the encoder includes an outer seal ring having an outer seal portion formed in a sectional shape in which an inner seal portion is inverted, an outer slinger, and a non-magnetic rubber-made encoder equivalent portion formed in a sectional shape in which an encoder is inverted and supported by the outer slinger. The radially inner portion of the encoder corresponding portion is configured to be in close contact with the axially inner surface of the rotary flange over the entire circumference, thereby suppressing development cost of the seal member and preventing moisture from entering between the rotary flange and the outer oil slinger.
Description
Technical Field
The present invention relates to a hub unit bearing for rotatably supporting a wheel of an automobile.
Background
Since a hub unit bearing that rotatably supports a wheel of an automobile with respect to a suspension device is used in an environment where muddy water is directly splashed, a high sealing performance is required for the hub unit bearing.
The hub unit bearing rotatably supports a hub that fixes a wheel via a plurality of rolling elements, on the radially inner side of an outer ring supported by a suspension device. A lubricant is sealed in an internal space in which the rolling elements are provided, and an opening of the internal space is sealed by a sealing member. The seal member needs to be designed to satisfy various performances required for the hub unit bearing.
Further, the rotation speed of the wheel is detected by the hub unit bearing, and for example, patent document 1 discloses a structure in which an encoder is provided to the seal member. When the encoder is provided to the seal member, the seal member needs to be designed in consideration of the function, the mounting property, and the like of the encoder. Therefore, it is necessary to develop a sealing member provided with an encoder and a sealing member not provided with an encoder.
In addition, the hub unit bearing has a pair of inner rings fitted around the fitting shaft portion of the hub wheel, and an axially outer surface of an outer inner ring disposed axially outward is brought into contact with an axially inner surface of a rotating flange provided on the hub wheel in order to position each inner ring axially with respect to the hub wheel. Since the contact portion between the rotary flange and the outer inner ring is not closed by the outer seal member (which closes the axial outer opening of the internal space), there is a possibility that muddy water in the external space reaches the contact portion and moisture enters the contact portion. As a result, abrasion (running) loss may occur in the contact portion.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2007-5-292092
SUMMERY OF THE UTILITY MODEL
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a structure of a hub unit bearing that can suppress the number of development steps of a seal member and effectively prevent moisture from entering an abutting portion between a rotary flange and an inner ring.
In order to solve the above problem, the present invention provides a hub unit bearing, comprising: an outer ring having an outer ring raceway on an inner circumferential surface thereof; an outer inner ring and an inner ring each having an inner ring raceway on an outer peripheral surface thereof; a plurality of rolling elements arranged between the outer ring raceway and the inner ring raceway so as to be rollable; a hub ring having a rotating flange protruding radially outward, the hub ring being fitted with the outer inner ring and the inner ring, and the outer inner ring abutting against an axially inner surface of the rotating flange; an inner seal member having an inner seal ring having an inner seal portion and fitted to an axially inner portion of the outer ring, an inner slinger fitted to the inner ring, and a magnetic rubber encoder supported by the inner slinger, and sealing an axially inner opening of an inner space in which the rolling elements are provided; and an outer seal member including an outer seal ring fitted into the axially outer portion of the outer ring and having an outer seal portion, an outer slinger fitted to the outer inner ring, and a non-magnetic rubber-made encoder corresponding portion supported by the outer slinger, and closing an axially outer opening of the inner space, wherein the inner seal portion and the outer seal portion have cross-sectional shapes that are reversed with respect to each other in the axial direction of the hub ring, the encoder and the encoder corresponding portion have cross-sectional shapes that are reversed with respect to each other in the axial direction of the hub ring at least in a range from the radially outer portion to a radially intermediate portion, and a radially inner portion of the encoder corresponding portion is in close contact with an axially inner surface of the rotary flange over the entire circumference.
Further, there is provided a hub unit bearing in which the encoder corresponding portion has a protruding portion protruding toward the axially outer side over the entire circumference, the protruding portion being in close contact with the axially inner side surface of the rotary flange.
Further, there is provided a hub unit bearing in which the encoder corresponding portion has a lip portion extending toward the axially outer side over the entire circumference, the lip portion being in close contact with the axially inner side face of the rotary flange.
According to the present invention, the development man-hour of the seal member can be suppressed, and the intrusion of moisture into the abutting portion between the rotary flange and the inner ring can be effectively suppressed.
Drawings
Fig. 1 is a sectional view showing a hub unit bearing according to embodiment 1.
Fig. 2 is an enlarged view of a portion a of fig. 1.
Fig. 3 is an enlarged view of a portion B of fig. 1.
Fig. 4 corresponds to fig. 2 and shows embodiment 2.
Fig. 5 corresponds to fig. 2 and shows embodiment 3.
Detailed Description
(embodiment 1)
Embodiment 1 will be described with reference to fig. 1 to 3. The hub unit bearing 1 of the present embodiment includes an outer ring 2 that does not rotate in a use state, a hub 3 that rotates together with a wheel and a braking rotating body in a use state, a plurality of tapered rollers 4, an inner seal member 5, an outer seal member 6, and an auxiliary seal member 7.
Further, the hub unit bearing 1 is configured such that the axially outer side is the left side of each drawing that becomes the vehicle width direction outer side in a state of being assembled in the vehicle, and the axially inner side is the right side of each drawing that becomes the vehicle width direction center side in a state of being assembled in the vehicle.
The outer ring 2 has a plurality of rows (two rows) of outer ring raceways 8a, 8b and a stationary flange 9. The outer ring raceways 8a and 8b are provided on the inner peripheral surface of the outer ring 2 and have a partially tapered shape. The stationary flange 9 is provided on the outer peripheral surface of the outer ring 2 for coupling to a suspension device.
The hub 3 is disposed coaxially with the outer ring 2 on the radially inner side of the outer ring 2, and has a plurality of rows (two rows) of inner ring raceways 10a and 10b and a rotating flange 11. The inner ring raceways 10a, 10b are provided on the outer peripheral surface of the hub 3 opposite the outer ring raceways 8a, 8b, and have a partially conical shape. The rotation flange 11 is provided at an axially outer side portion of the hub 3 projecting axially outward from the outer ring 2, and has a substantially circular ring shape extending radially outward. Since the hub unit bearing 1 of the present embodiment is for a drive wheel, the hub 3 has a spline hole 13 for engaging a spline shaft constituting a drive shaft member, not shown.
The tapered rollers 4 are held by the cage 14 between the outer ring raceways 8a, 8b and the inner ring raceways 10a, 10b, and are arranged so as to be rollable so that a plurality of them are provided in each row. The hub 3 is rotatably supported on the radially inner side of the outer ring 2. The hub 3 is configured by combining an outer inner ring 15a, an inner ring 15b, and a hub wheel 16.
The outer inner ring 15a is disposed radially inward of the outer ring raceways 8a of the axially outer row, and has a single row (one row) of inner ring raceways 10a of the axially outer row on the outer peripheral surface of the axially intermediate portion. The outer inner ring 15a has a small brim 17a axially inside the inner ring raceway 10a, and a large brim 18a axially outside the inner ring raceway 10 a.
The inner ring 15b is disposed radially inward of the outer ring raceways 8b of the axially inner row, and has a single row (one row) of inner ring raceways 10b of the axially inner row on the outer peripheral surface of the axially intermediate portion. The inner ring 15b has a small brim 17b on the axially outer side of the inner ring raceway 10b, and a large brim 18b on the axially inner side of the inner ring raceway 10 b.
The hub wheel 16 is a shaft member that holds the outer inner ring 15a and the inner ring 15b by fitting them to the outside, and has a spline hole 13, a fitting shaft portion 19, and a rotary flange 11. The spline hole 13 axially penetrates a radially central portion of the hub ring 16. The fitting shaft portion 19 is provided in a range from an axially inner portion to an axially intermediate portion of the hub wheel 16, and the outer inner ring 15a and the inner ring 15b are fitted to each other with interference in a state where the small eaves 17a and 17b are in contact with each other. The rotating flange 11 protrudes radially outward from an axially outer side portion of the hub wheel 16.
The rotary flange 11 has mounting holes 20 at a plurality of positions equally spaced in the circumferential direction. A base end portion of the hub bolt 21 is press-fitted into the mounting hole 20. An axially inner surface of the radially inner portion of the rotary flange 11 is formed with a fitting surface 22, which is a flat surface existing on an imaginary plane orthogonal to the central axis of the hub wheel 16.
Grease is sealed in an internal space 23 which exists between the inner peripheral surface of the outer ring 2 and the outer peripheral surface of the hub 3 and in which the tapered rollers 4 are provided. In order to prevent grease from leaking to the outside and prevent foreign matter such as muddy water from entering the internal space 23, the axially inner opening of the internal space 23 is closed by the inner seal member 5, and the axially outer opening is closed by the outer seal member 6.
As shown in fig. 3, the inner seal member 5 includes an inner seal ring 24, an inner slinger 25, and an encoder 26.
The inner seal ring 24 is fitted and fixed to an axially inner portion of the outer ring 2, and includes an inner metal core 27 and an inner seal portion 28 fixed to the inner metal core 27.
The inner metal core 27 is manufactured by pressing a metal plate, has a substantially L-shaped cross-sectional shape, and is annular as a whole. The inner metal core 27 includes a cylindrical fixed cylindrical portion 27a fitted and fixed to an axially inner portion of the outer ring 2, and an annular fixed ring portion 27b bent radially inward from an axially outer portion of the fixed cylindrical portion 27 a.
The inner seal portion 28 is made of an elastic material, is fixed to the surface of the inner metal core 27 over the entire circumference, and has three seal lips 28a to 28 c. Fig. 3 and fig. 2 described later show the shape of each seal lip in a free state.
The inner slinger 25 is formed by pressing a ferritic stainless steel plate such as SUS430 or a metal plate subjected to rust prevention treatment, has a substantially L-shaped cross-sectional shape, and is annular as a whole. The inner slinger 25 is fitted and fixed to the large brim 18b of the inner ring 15 b. The inner slinger 25 has a cylindrical rotating cylindrical portion 25a fitted around the outer peripheral surface of the large brim portion 18b with interference, and a circular rotating ring portion 25b bent at a right angle radially outward from the axially inner end portion of the rotating cylindrical portion 25 a. The distal end edge of the seal lip 28a is brought into sliding contact with the rotary ring portion 25b, and the distal end edges of the seal lips 28b and 28c are brought into sliding contact with the rotary cylinder portion 25 a.
The encoder 26 is made of magnetic rubber containing about 80 wt% to 90 wt% of magnetic material such as ferrite, and is formed in a ring shape as a whole. The encoder 26 is supported on an axially inner surface of the rotary ring portion 25 b. On the detection surface (axially inner surface) of the encoder 26, the S-poles and the N-poles are alternately arranged at equal intervals in the circumferential direction. A sensor, not shown, is disposed close to the detection surface of the encoder 26, thereby detecting the rotational speed of the wheel.
As shown in fig. 2, the outer seal member 6 includes an outer seal ring 29, an outer slinger 30, and an encoder corresponding portion 31.
The outer seal ring 29 is fitted and fixed to an axially outer portion of the outer ring 2, and includes an outer metal core 32 and an outer seal portion 33 fixed to the outer metal core 32. The outer seal ring 29 is the same as the inner seal ring 24 constituting the inner seal member 5, but is assembled in a direction axially opposite to the assembling direction of the inner seal ring 24.
The outer metal core 32 is the same as the inner metal core 27 constituting the inner seal member 5, has a substantially L-shaped cross-sectional shape, and is annular as a whole. The outer metal core 32 includes a cylindrical fixed cylindrical portion 32a fitted and fixed to an axially outer portion of the outer ring 2, and an annular fixed annular portion 32b bent radially inward from an axially inner portion of the fixed cylindrical portion 32 a.
The outer seal 33 is made of an elastic material and is fixed to the surface of the outer metal core 32 over the entire circumference. The outer seal portion 33 has a cross-sectional shape obtained by inverting the cross-sectional shape of the inner seal portion 28 constituting the inner seal member 5 in the axial direction of the hub wheel 16 (the left-right direction in fig. 1 to 3). The outer seal 33 has three seal lips 33a to 33 c. In the inner seal portion 28 and the outer seal portion 33, the cross-sectional shapes of the three seal lips 28a to 28c and 33a to 33c and the cross-sectional shape of the base portion covering the surfaces of the inner metal core 27 and the outer metal core 32 are inverted from each other in the axial direction of the hub wheel 16.
The outer slinger 30 is the same as the inner slinger 25 constituting the inner seal member 5, has a substantially L-shaped cross-sectional shape, and is annular as a whole. The outer oil slinger 30 is fitted and fixed to the outer peripheral surface of the large brim 18a of the outer inner ring 15 a. The outer oil slinger 30 has a cylindrical rotating cylindrical portion 30a fitted around the outer peripheral surface of the large brim portion 18a with interference, and a circular rotating ring portion 30b bent at a right angle radially outward from the axial outer end of the rotating cylindrical portion 30 a. The distal end edge of the seal lip 33a is brought into sliding contact with the rotary ring portion 30b, and the distal end edges of the seal lips 33b and 33c are brought into sliding contact with the rotary cylinder portion 30 a.
The encoder corresponding portion 31 is made of an elastic material and has a circular shape as a whole. The encoder corresponding portion 31 is supported on an axially outer surface of the rotary ring portion 30 b. The encoder corresponding portion 31 has a cross-sectional shape in which the cross-sectional shape of the encoder 26 constituting the inner seal member 5 is reversed in the axial direction of the hub wheel 16 over the entire range from the radially outer portion to the radially inner portion. The axially outer side surface of the encoder corresponding portion 31 is a flat surface that exists on an imaginary plane orthogonal to the center axis of the hub wheel 16 over the entire range from the radially outer side portion to the radially inner side portion.
The material constituting the encoder equivalent part 31 may be the same as that of the vulcanizing mold used for vulcanizing and molding the encoder 26, and may be a non-magnetic rubber such as nitrile rubber, acrylic rubber, or fluororubber, that is, a sealing rubber to which no magnetic material is added. Since the difference in cross-sectional shape due to the difference in shrinkage rate of the material is small, the cross-sectional shape of the encoder-corresponding portion 31 is substantially the same as that of the encoder 26 when vulcanization molding is performed using the same mold.
The outer slinger 30 is regulated in the externally fitted position with respect to the outer inner ring 15a, and the axially outer surface of the encoder corresponding portion 31 slightly protrudes axially outward from the axially outer surface of the outer inner ring 15 a. Thus, in the assembled state of the hub unit bearing 1, the radially inner portion of the axially outer side surface of the encoder corresponding portion 31 is brought into close contact with the radially outer portion of the mating surface 22 over the entire circumference. When the rubber hardness (shore a) of the encoder corresponding portion 31 is 60 to 75, the extent to which the axially outer side surface of the encoder corresponding portion 31 protrudes axially outward from the axially outer side surface of the inner ring 15a is about 5% to 20% of the thickness dimension of the encoder corresponding portion 31 (about 0.05mm to 0.2mm when converted to the axial dimension). If the protrusion amount is less than 5%, the contact surface pressure between the radially inner portion of the axially outer surface of the encoder corresponding portion 31 and the radially outer portion of the mating surface 22 is insufficient, and it is difficult to obtain sufficient sealing performance. If the overhang is greater than 20%, the tensile stress at the boundary between the portion (radially inner portion) in contact with the mating surface 22 and the portion (radially intermediate portion) not in contact with the mating surface 22 in the encoder corresponding portion 31 increases, which may cause problems such as an increase in permanent strain and the above-described boundary fracture.
The auxiliary seal member 7 is fitted and fixed to the outer side of the outer ring 2 in the axial direction, and includes a metal core 34 and a seal portion 35. The metal core 34 has a substantially L-shaped cross-sectional shape and is annular as a whole. The metal core 34 includes a metal core cylindrical portion 34a fitted and fixed to the outer side portion in the axial direction of the outer ring 2, and a metal core annular portion 34b bent radially inward from the outer end portion in the axial direction of the metal core cylindrical portion 34a and having an inner side surface in the axial direction in contact with the outer end surface in the axial direction of the outer ring 2. The seal portion 35 includes a seal base portion 35a that covers the outer peripheral surface of the metal core cylindrical portion 34a and the axially outer side surface of the metal core annular portion 34b, and a seal lip 35b whose base end portion is joined to the seal base portion 35 a. The seal lip 35b is inclined in a direction radially outward as it goes axially outward, and the tip end portion thereof is brought into sliding contact with or closely opposed to the axially inner surface of the rotary flange 11 over the entire circumference. The auxiliary seal member 7 seals a gap between the axially outer end surface of the outer ring 2 and the axially inner side surface of the rotary flange 11.
According to the hub unit bearing 1 of the present embodiment as described above, it is possible to effectively suppress the intrusion of moisture into the contact portion 36 between the rotating flange 11 and the outer inner ring 15a while suppressing the number of development steps for the inner seal member 5 and the outer seal member 6.
Although the inner seal member 5 provided with the encoder 26 and the outer seal member 6 not necessarily provided with the encoder need to be separately developed, in the present embodiment, the encoder corresponding portion 31 having a cross-sectional shape obtained by inverting the cross-sectional shape of the encoder 26 is provided to the outer seal member 6, thereby reducing the number of development steps. That is, by providing the encoder corresponding portion 31 to the outer seal member 6, the same member can be used for the combined seal ring portion other than the encoder corresponding portion 31 in the outer seal member 6 and the combined seal ring portion other than the encoder 26 in the inner seal member 5. Therefore, the number of development steps of the press die and the like can be suppressed. Further, since the cross-sectional shape of the inner seal portion 28 and the cross-sectional shape of the outer seal portion 33 can be made to be mutually inverted in the axial direction of the hub wheel 16, the molding die used for vulcanization molding of the inner seal portion 28 and the molding die used for vulcanization molding of the outer seal portion 33 can be shared. In addition, since the cross-sectional shape of the encoder 26 and the cross-sectional shape of the encoder corresponding portion 31 are reversed in the axial direction of the hub wheel 16, the vulcanizing mold used for vulcanizing the encoder 26 and the vulcanizing mold used for vulcanizing the encoder corresponding portion 31 can be shared. Therefore, the number of steps for developing the vulcanization mold can be reduced. As a result, the number of development steps for the inner seal member 5 and the outer seal member 6 can be suppressed.
Further, since the radially inner portion of the axially outer surface of the encoder corresponding portion 31 is brought into close contact with the radially outer portion of the mating surface 22 of the rotary flange 11 over the entire circumference, it is possible to effectively prevent water from entering the contact portion 36 between the mating surface 22 and the axially outer surface of the outer inner ring 15 a. Since the sealing performance of the contact portion 36 can be sufficiently ensured, it is possible to prevent a reduction in bearing preload due to abrasion loss (erosion wear) associated with rust.
(embodiment 2)
The outer seal member 6a has a protruding portion 37 having a rectangular (rectangular) cross-sectional shape that protrudes outward in the axial direction over the entire circumference, at a radially inner portion of the axially outer surface of the encoder corresponding portion 31 a. The axial dimension, which is the amount of protrusion (projection amount) of the projecting portion 37 to the outside in the axial direction, is equal to or less than the thickness dimension (axial dimension) of the encoder corresponding portion 31a at a portion radially apart from the projecting portion 37. The radial dimension of the protruding portion 37 is equal to the thickness dimension of the encoder corresponding portion 31 a. The tip end of the protruding portion 37 is brought into close contact with the radially outer portion of the mating surface 22 formed on the axially inner surface of the rotary flange 11.
Since the thickness dimension of the radially inner portion of the encoder corresponding portion 31a can be increased by providing the extension portion 37, the interference generated between the encoder corresponding portion 31a and the mating surface 22 can be made larger than that of embodiment 1. The radially inner portion of the encoder corresponding portion 31a is not formed by inverting the sectional shape of the encoder 26, but has a sectional shape in which the sectional shape of the encoder 26 is inverted in a range from the radially outer portion to the radially intermediate portion of the encoder corresponding portion 31 a.
Since the interference can be secured to a large extent, it is not necessary to strictly limit the externally fitting position of the outer slinger 30 with respect to the outer inner ring 15 a. Further, the encoder corresponding part 31a and the encoder 26 can be molded by using only the units having different shapes of the portions to be molded only with the extension parts 37 out of the vulcanization mold composed of a plurality of mold units. Therefore, the encoder corresponding part 31a and the encoder 26 can be formed without increasing the cost. Other structures and operations are the same as those of embodiment 1.
(embodiment 3)
The outer seal member 6b of the present embodiment has a lip portion 38 extending outward in the axial direction over the entire circumference at the radially inner side of the encoder corresponding portion 31 b. The axial outward elongation of the lip 38 is sufficiently larger than the thickness dimension of the encoder equivalent portion 31b at the portion radially apart from the lip 38. The lip portion 38 is circular truncated cone-shaped and is inclined in a direction that is radially inward toward the axially outer side. The tip end of the lip 38 is in close contact with a portion having an arc-shaped cross-sectional shape located radially outward of the mating surface 22 at a radially intermediate portion of the axially inner surface of the rotary flange 11. The outer peripheral surface of the large brim portion 18a of the outer inner ring 15a is positioned radially outward of the mating surface 22. The interference between the lip portion 38 and the axially inner surface of the rotary flange 11 is made larger than the interference between the protruding portion 37 (see fig. 4) of embodiment 2 and the mating surface 22.
According to the present embodiment, since the interference generated between the lip portion 38 and the axially inner surface of the rotary flange 11 can be ensured to be larger, it is not necessary to strictly limit the externally fitting position of the outer oil slinger 30 with respect to the inner ring 15a as compared with the embodiment 1. Other structures and functions are the same as those of embodiment 2.
The present invention can be applied to a structure in which balls are used as rolling elements, and can be applied to a hub unit bearing for a driven wheel.
Claims (3)
1. A hub unit bearing is characterized by comprising:
an outer ring having an outer ring raceway on an inner circumferential surface thereof;
an outer inner ring and an inner ring each having an inner ring raceway on an outer peripheral surface thereof;
a plurality of rolling elements arranged to be rollable between the outer ring raceway and the inner ring raceway;
a hub ring having a rotating flange protruding radially outward, the hub ring being fitted with the outer inner ring and the inner ring, and the outer inner ring being in contact with an axially inner surface of the rotating flange;
an inner seal member including an inner seal ring having an inner seal portion and fitted into an axially inner portion of the outer ring, an inner oil slinger fitted to the inner ring, and an encoder made of magnetic rubber supported by the inner oil slinger, and configured to close an axially inner opening of an inner space in which the rolling elements are provided; and
an outer seal member having an outer seal portion and fitted into an axially outer portion of the outer ring, an outer oil slinger fitted to the outer inner ring, and a non-magnetic rubber encoder corresponding portion supported by the outer oil slinger, and sealing an axially outer opening of the internal space,
the inner side seal portion and the outer side seal portion have cross-sectional shapes that are mutually reversed in the axial direction of the hub ring,
the encoder and the encoder corresponding portion have cross-sectional shapes that are mutually reversed in the axial direction of the hub ring at least in a range from a radially outer portion to a radially intermediate portion,
the radially inner side of the encoder corresponding portion is in close contact with the axially inner side of the rotary flange over the entire circumference.
2. The hub unit bearing according to claim 1,
the encoder corresponding portion has a protruding portion that protrudes outward in the axial direction over the entire circumference, and the protruding portion is in close contact with the axially inner side surface of the rotary flange.
3. The hub unit bearing according to claim 1,
the encoder corresponding portion has a lip portion elongated toward the axially outer side over the entire circumference, the lip portion being in close contact with the axially inner side face of the rotating flange.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-101323 | 2018-05-28 | ||
| JP2018101323A JP2019206977A (en) | 2018-05-28 | 2018-05-28 | Hub unit bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210118363U true CN210118363U (en) | 2020-02-28 |
Family
ID=68105161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920773263.4U Active CN210118363U (en) | 2018-05-28 | 2019-05-27 | Hub unit bearing |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2019206977A (en) |
| CN (1) | CN210118363U (en) |
| DE (1) | DE202019102992U1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202000023791A1 (en) * | 2020-10-09 | 2022-04-09 | Skf Ab | SEAL FOR BEARING UNIT |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4720400B2 (en) | 2005-09-22 | 2011-07-13 | 日本精工株式会社 | Rolling bearing unit for wheel support with combined seal ring and manufacturing method thereof |
| JP4952035B2 (en) | 2006-04-21 | 2012-06-13 | 日本精工株式会社 | Manufacturing method of seal ring with encoder and rolling bearing unit with encoder |
| JP2015028372A (en) | 2013-07-31 | 2015-02-12 | 日本精工株式会社 | Rolling bearing unit for supporting wheel |
| JP6610166B2 (en) | 2015-01-21 | 2019-11-27 | 日本精工株式会社 | Hub unit bearing |
-
2018
- 2018-05-28 JP JP2018101323A patent/JP2019206977A/en active Pending
-
2019
- 2019-05-27 CN CN201920773263.4U patent/CN210118363U/en active Active
- 2019-05-28 DE DE202019102992.7U patent/DE202019102992U1/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE202019102992U1 (en) | 2019-09-16 |
| JP2019206977A (en) | 2019-12-05 |
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