CN115176092A - Wheel hub anti-disengaging structure - Google Patents
Wheel hub anti-disengaging structure Download PDFInfo
- Publication number
- CN115176092A CN115176092A CN202180016897.5A CN202180016897A CN115176092A CN 115176092 A CN115176092 A CN 115176092A CN 202180016897 A CN202180016897 A CN 202180016897A CN 115176092 A CN115176092 A CN 115176092A
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- China
- Prior art keywords
- width direction
- vehicle width
- roller bearing
- hub
- race
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000002093 peripheral effect Effects 0.000 claims description 56
- 238000000926 separation method Methods 0.000 claims description 9
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
- B60B35/12—Torque-transmitting axles
- B60B35/18—Arrangement of bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- 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
- F16C19/36—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 a single row of rollers
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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
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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
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
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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
- F16C35/063—Fixing them on the shaft
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The outer end surface (22 a) of the outer race (22) of the outer roller bearing (14) is positioned further inward in the vehicle width direction than the outer end surface (21 a) of the inner race (21). The inner end surface (31) of the nut flange section (26) of the hub nut (15) in the vehicle width direction is formed in a planar shape that is orthogonal to the axis (CL) of the axle housing (11). A radially inner region (32) of a vehicle-width-direction inner end surface (31) of the nut flange portion (26) is in surface contact with a vehicle-width-direction outer end surface (21 a) of an inner race (21) of the outer roller bearing (14). The region of the nut flange portion (26) radially outward of the vehicle width direction inner end surface (31) is opposed to the vehicle width direction outer end surface (22 a) of the outer race (22) at a position spaced outward in the vehicle width direction from the vehicle width direction outer end surface (22 a) of the outer race (22) of the outer roller bearing (14).
Description
Technical Field
The present disclosure relates to a hub disengagement prevention structure.
Background
Patent document 1 describes a vehicle brake device. The drive shaft is inserted through a center portion of the axle housing on the vehicle body side. The hub is fixed on the inner peripheral side to a flange portion formed at the shaft end of the drive shaft by a plurality of bolts. The wheel hub is axially supported on the outer periphery of the end portion of the axle housing via a bearing which is composed of two roller bearings capable of receiving a radial load and an axial load. In this publication, a retainer is shown to be disposed on the outer side in the vehicle width direction of an inner race of the outer bearing in the vehicle width direction of the two bearings.
Prior art documents
Patent literature
Patent document 1: japanese patent laid-open No. 2003-343612
Disclosure of Invention
Technical problems to be solved by the invention
In the vehicle described in patent document 1, when a roller of an outer roller bearing (hereinafter referred to as an "outer roller bearing") of the two roller bearings in the vehicle width direction is broken, an outer race of the outer roller bearing can move outward in the vehicle width direction with respect to an inner race, and therefore, there is a possibility that a wheel hub (wheel hub) moves outward in the vehicle width direction with respect to a vehicle axle housing (axle housing). When the outer race of the outer roller bearing moves outward in the vehicle width direction beyond the retainer, the hub moves outward in the vehicle width direction with respect to the axle housing, and the hub may drop off from the axle housing.
Therefore, the present disclosure aims to provide a hub retaining structure that can prevent a hub from coming off an axle housing by suppressing a movement distance of the hub to the outside in the vehicle width direction when a roller of an outer roller bearing is damaged.
Means for solving the problems
In order to solve the above problem, a wheel hub retaining structure according to a first aspect of the present disclosure includes a cylindrical axle housing, an annular wheel hub, two roller bearings, and a nut. The tubular axle housing extends in the vehicle width direction. The annular hub has a hub inner peripheral surface defining an insertion hole through which the axle housing is inserted and opposed to a housing outer peripheral surface of the axle housing. The two roller bearings each have: an annular inner race supported on the outer peripheral surface side of the housing; an annular outer race disposed radially outward of the inner race and supported on an inner peripheral surface side of the hub; and a plurality of rollers disposed between the inner race and the outer race, wherein the two roller bearings are disposed so as to be separated from each other in the vehicle width direction, and rotatably support the hub with respect to the axle housing. The nut is fastened and fixed to the outer peripheral surface of the housing of the axle housing in a state of being in contact with the outer end surface in the vehicle width direction of the inner race of the outer roller bearing on the outer side in the vehicle width direction of the two roller bearings, and regulates the inner race of the outer roller bearing from moving to the outer side in the vehicle width direction. The outer race of the outer roller bearing has a vehicle width direction outer end surface located inward in the vehicle width direction from a vehicle width direction outer end surface of the inner race of the outer roller bearing. The nut has: a nut body portion formed with a threaded hole; and a disc-shaped nut flange portion extending radially outward from an inner end portion of the nut main body portion in the vehicle width direction. The nut flange portion has, on its inner end surface in the vehicle width direction: an inner diameter side region abutting against an outer end surface of the inner race of the outer roller bearing in the vehicle width direction; and a region on an outer diameter side opposite to the outer end surface of the outer race in the vehicle width direction at a position spaced apart from the outer end surface of the outer race of the outer roller bearing in the vehicle width direction to an outer side in the vehicle width direction, the inner end surface of the nut flange portion in the vehicle width direction being formed in a planar shape orthogonal to the axial direction of the axle housing.
In the above configuration, the region on the outer diameter side of the vehicle width direction inner end surface of the nut flange portion is opposed to the vehicle width direction outer end surface of the outer race at a position separated outward in the vehicle width direction from the vehicle width direction outer end surface of the outer race of the outer roller bearing. Therefore, even if the rollers of the outer roller bearing are broken, the outer race of the outer roller bearing moves outward in the vehicle width direction with respect to the inner race, and the vehicle width direction outer end surface of the outer race of the outer roller bearing abuts against the vehicle width direction inner end surface (the region on the outer diameter side) of the nut flange portion, so that the movement of the hub outward in the vehicle width direction can be restricted by this abutment.
Further, the inner end surface of the nut flange portion in the vehicle width direction is formed in a flat shape orthogonal to the axial direction of the axle housing, and the region on the inner diameter side of the inner end surface of the nut flange portion in the vehicle width direction abuts against the outer end surface of the inner race of the outer roller bearing in the vehicle width direction. Therefore, the outer race can be restricted from moving outward in the vehicle width direction when the rollers of the outer roller bearing are damaged to the vehicle width position of the outer end surface of the inner race in the vehicle width direction. That is, by appropriately setting the distance separating the outer end surface of the outer race of the outer roller bearing in the vehicle width direction and the inner end surface of the nut flange portion in the vehicle width direction, the distance of movement of the hub outward in the vehicle width direction when the rollers of the outer roller bearing are broken can be suppressed.
Further, since the outer race of the outer roller bearing does not move outward in the vehicle width direction than the inner race, the outer race of the inner roller bearing on the inner side in the vehicle width direction of the two roller bearings is less likely to come off from the inner race of the inner roller bearing to the outer side in the vehicle width direction. Therefore, even if the rollers of the outer roller bearing are broken, the hub can be rotatably supported with respect to the axle housing by the inner roller bearing.
Therefore, the distance of movement of the wheel hub outward in the vehicle width direction when the rollers of the outer roller bearing are broken can be suppressed, and the wheel hub can be prevented from falling off the axle housing.
Further, the outer end surface of the outer race of the outer roller bearing in the vehicle width direction is located inward in the vehicle width direction from the outer end surface of the inner race of the outer roller bearing in the vehicle width direction, and the region on the outer diameter side of the inner end surface of the nut flange portion in the vehicle width direction is separated outward in the vehicle width direction from the outer end surface of the outer race of the outer roller bearing in the vehicle width direction. That is, since a space is provided between the outer end surface of the outer race of the outer roller bearing in the vehicle width direction and the inner end surface of the nut flange portion in the vehicle width direction, a space on the inner side in the vehicle width direction with respect to the nut and a space on the outer side in the vehicle width direction can communicate with each other through the space. Therefore, for example, an oil chamber for storing oil to be supplied to the outer roller bearing can be provided on the vehicle width direction outer side of the outer roller bearing, and oil can be supplied from the oil chamber to the outer roller bearing.
A second aspect of the present disclosure is the hub separation preventing structure of the first aspect, wherein a vehicle width direction separation distance between an outer end surface of the outer race of the outer roller bearing and an inner end surface of the nut flange portion is set to a distance: even if the outer race of the inner roller bearing on the inner side in the vehicle width direction of the two roller bearings moves outward in the vehicle width direction with respect to the inner race of the inner roller bearing, the inner roller bearing can rotatably support the hub with respect to the axle housing.
In the above configuration, the distance separating the outer end surface of the outer race of the outer roller bearing in the vehicle width direction from the inner end surface of the nut flange portion in the vehicle width direction is set to be as follows: even if the outer race of the inner roller bearing moves outward in the vehicle width direction with respect to the inner race, the inner roller bearing can rotatably support the hub with respect to the axle housing. That is, since the distance of movement of the wheel hub outward in the vehicle width direction when the roller of the roller bearing (outer roller bearing) on the outer side in the vehicle width direction is broken can be suppressed to a distance that does not impair the function of the inner roller bearing, even if the roller of the outer roller bearing is broken, the wheel hub can be rotatably supported with respect to the axle housing by the inner roller bearing.
A third aspect of the present disclosure is the hub separation preventing structure according to the first or second aspect, wherein the hub inner circumferential surface of the hub includes: a first region supporting an outer peripheral surface of an outer race of the outer roller bearing; and a second region continuous from the first region and extending outward in the vehicle width direction. The second region of the inner peripheral surface of the hub extends outward in the vehicle width direction than the nut and defines an oil chamber for storing oil supplied to the outer roller bearing. The outer diameter of the nut flange portion is smaller than the inner diameter of the second region of the hub inner peripheral surface.
In the above configuration, since the outer diameter of the nut flange portion is smaller than the inner diameter of the second region of the inner peripheral surface of the hub, a flow path of oil from the oil chamber to the outer roller bearing can be ensured.
Effects of the invention
According to the present disclosure, the moving distance of the wheel hub to the outside in the vehicle width direction when the roller of the outer roller bearing is damaged can be suppressed, and the wheel hub can be prevented from coming off the axle housing.
Drawings
Fig. 1 is a sectional view of a hub slip-off preventing structure according to an embodiment of the present disclosure.
Fig. 2 is an enlarged view of II of fig. 1.
Fig. 3 is an external view of the boss nut as viewed from the outside in the vehicle width direction.
Fig. 4 is a sectional view looking down on IV-IV of fig. 3.
Fig. 5 is an enlarged view of V of fig. 2.
Detailed Description
Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. IN the drawings, UP indicates an upper side, IN indicates an inner side IN the vehicle width direction, and a dashed line CL indicates an axial center of the drive shaft. In the following description, the front-rear direction refers to the front-rear direction of the vehicle, and the left-right direction refers to the left-right direction in a state of being directed toward the front of the vehicle.
As shown in fig. 1, the wheel hub retaining structure of the present embodiment is applied to a retaining structure for a wheel hub 12 rotatably supported by an axle housing 11 of a vehicle. Wheel hub anti-disengaging structure includes: an axle housing 11, a hub 12, two roller bearings 13, 14, and a hub nut 15.
The axle housing 11 is formed in a cylindrical shape extending in the vehicle width direction, and has the drive shaft 4 inserted therein. A male screw (not shown) to which the hub nut 15 is screwed and a stopper locking groove 28 (see fig. 2) extending over the entire circumferential region in the circumferential direction at a position adjacent to the outside of the male screw in the vehicle width direction are formed in the outer peripheral surface 11a of the axle housing 11 (hereinafter referred to as "housing outer peripheral surface 11 a") at the vehicle width direction outer end portion. The driveshaft 4 is rotatable relative to the axle housing 11, and a vehicle-width-direction outer end portion of the driveshaft 4 projects outward in the vehicle width direction from the axle housing 11. A flange portion 4a that expands radially outward is formed at the vehicle width direction outer end portion of the drive shaft 4.
The hub 12 is formed in an annular shape having an inner peripheral surface 12a (hereinafter, referred to as "hub inner peripheral surface 12 a") opposed to the housing outer peripheral surface 11a of the axle housing 11. The hub inner peripheral surface 12a defines an insertion hole 16 through which the axle housing 11 is inserted. A flange portion 12b protruding radially outward is formed on the outer peripheral surface of the hub 12. The flange portion 12b is fastened and fixed with a wheel disc (not shown) of the wheel and the brake drum 2 by bolts 3 and nuts (not shown). The hub 12 is rotatable relative to the axle housing 11 via two roller bearings 13 and 14. The vehicle width direction outer end portion of the hub 12 is fastened and fixed to the flange portion 4a of the drive shaft 4. In other words, the hub 12 is rotatable together with the drive shaft 4 relative to the axle housing 11.
As shown in fig. 1 and 2, the two roller bearings 13 and 14 are tapered roller bearings, are disposed between the housing outer peripheral surface 11a of the axle housing 11 and the hub inner peripheral surface 12a of the hub 12, and rotatably support the hub 12 with respect to the axle housing 11. The two roller bearings 13 and 14 are disposed apart from each other in the vehicle width direction.
Of the two roller bearings 13 and 14, the roller bearing 13 on the inner side in the vehicle width direction (hereinafter referred to as "inner roller bearing 13") includes: an annular inner race 17 supported on the axle housing 11; an annular outer race 18 supported by the hub 12; a plurality of rollers 19; and a holder 20 for holding the roller 19. The outer peripheral surface 17a of the inner race 17 is formed in a tapered shape that tapers toward the vehicle width direction outer side tip. The inner peripheral surface 18a of the outer race 18 is formed in a tapered shape tapered toward the vehicle width direction outer side tip, and is disposed at a position separated radially outward from the outer peripheral surface 17a of the inner race 17 so as to face the outer peripheral surface 17a of the inner race 17. The plurality of rollers 19 are formed in a conical shape, are arranged in parallel in the circumferential direction between the outer circumferential surface 17a of the inner race 17 and the inner circumferential surface 18a of the outer race 18, and are held on the inner race 17 side by the cage 20.
Of the two roller bearings 13 and 14, the roller bearing 14 on the vehicle width direction outer side (hereinafter referred to as "outer roller bearing 14") includes: an annular inner race 21 supported on the axle housing 11; an annular outer race 22 supported by the hub 12; a plurality of rollers 23; and a holder 24 for holding the roller 23. The vehicle width direction outer end surface 21a of the inner race 21 is formed in a flat shape orthogonal to the axial center CL of the drive shaft 4. The outer peripheral surface 21b of the inner race 21 is formed in a tapered shape tapered toward the vehicle width direction inner side tip. The outer end surface 22a of the outer race 22 in the vehicle width direction is formed in a flat surface orthogonal to the axial center CL of the drive shaft 4 and is located inward in the vehicle width direction from the outer end surface 21a of the inner race 21 in the vehicle width direction. The inner peripheral surface 22b of the outer race 22 is formed in a tapered shape tapered toward the vehicle width direction inner side tip, and is disposed at a position separated radially outward from the outer peripheral surface 21b of the inner race 21 so as to face the outer peripheral surface 21b of the inner race 21. The plurality of rollers 23 are formed in a conical shape, are arranged in parallel in the circumferential direction between the outer circumferential surface 21b of the inner race 21 and the inner circumferential surface 22b of the outer race 22, and are held on the inner race 21 side by the cage 24. The vehicle width direction separation distance L1 (see fig. 5) between the vehicle width direction outer end surface 22a of the outer race 22 and the vehicle width direction outer end surface 21a of the inner race 21 is set to the following distance: even if the outer race 18 of the inner roller bearing 13 moves outward in the vehicle width direction with respect to the inner race 17, the plurality of rollers 19, and the cage 20, the hub 12 can be rotatably supported with respect to the axle case 11 by the inner roller bearing 13 by a distance (the function as the inner roller bearing 13 can be ensured).
As shown in fig. 2 to 5, the hub nut 15 is a nut for attaching the hub 12 to the axle housing 11 by fastening the inner race 21 of the outer roller bearing 14 to the axle housing 11 inward in the vehicle width direction. The hub nut 15 has: a nut main body portion 25 capable of retaining a tool when fastened to the axle housing 11; and a disc-shaped nut flange portion 26 extending in a flange shape radially outward from the vehicle width direction inner end portion of the nut main body portion 25. The nut body 25 is formed in a regular hexagonal shape, for example. A screw hole 25a is provided in a central portion of the nut main body portion 25, and the screw hole 25a is formed with an internal thread that can be screwed with an external thread of the housing outer peripheral surface 11a of the axle housing 11. Further, a plurality of (three in the present embodiment) bolt insertion holes 27 penetrating in the vehicle width direction are formed in a portion of the nut main body portion 25 radially outward of the screw hole 25 a. A female screw is formed on the inner peripheral surface of the bolt insertion hole 27. After the hub nut 15 is fastened to the axle housing 11, an annular snap ring 29 is fitted into a stopper locking groove 28 of the axle housing 11 on the outer side in the vehicle width direction than the hub nut 15, and the snap ring 29 and the hub nut 15 are fastened and fixed by a bolt 30 that can be screwed into a bolt insertion hole 27 of the hub nut 15, thereby preventing the hub nut 15 from loosening. The radius r1 of the nut flange portion 26 to the outer edge is smaller than the radius r2 of a region (a second region 35 described later) of the hub inner peripheral surface 12a that is located further outward in the vehicle width direction than the outer race 22 of the outer roller bearing 14, and is larger than the radius r3 of the inner end of the outer race 22 of the outer roller bearing 14 in the radial direction of the vehicle width direction outer end surface 22 a. That is, the outer diameter (diameter) of the nut flange portion 26 is smaller than the inner diameter (diameter) of the second region 35 of the hub inner peripheral surface 12a of the hub 12. Further, the outer diameter of the nut flange portion 26 is set to the following size: even if the rollers 23 of the outer roller bearing 14 are broken, the hub 12 rotates about an axis inclined with respect to the axial center CL of the drive shaft 4 (even when the hub rotates in a rattling state), and the hub inner peripheral surface 12a of the hub 12 (a second region 35 described later) does not abut against the hexagonal outer edge of the nut body 25 (does not abut against the nut flange 26 due to interference therewith). The vehicle width direction inner end surface 31 of the nut flange portion 26 (the vehicle width direction inner end surface 31 of the hub nut 15) is formed in a planar shape orthogonal to the axis CL of the axle housing 11. A radially inner (inner diameter side) region 32 of the vehicle width direction inner end surface 31 of the nut flange portion 26 is in surface contact (abutment) with the vehicle width direction outer end surface 21a of the inner race 21 of the outer roller bearing 14. A radially outer (outer diameter side) region 33 of the vehicle width direction inner end surface 31 of the nut flange portion 26 is opposed to the vehicle width direction outer end surface 22a of the outer race 22 of the outer roller bearing 14 at a position separated outward in the vehicle width direction by a distance L1 from the vehicle width direction outer end surface 22a toward the vehicle width direction outer side. The length L2 in the radial direction of the region where the vehicle width direction inner end surface 31 of the nut flange portion 26 opposes the vehicle width direction outer end surface 22a of the outer race 22 of the outer roller bearing 14 is the length (r 1-r 3) of the difference between the radius r1 of the nut flange portion 26 to the outer edge and the radius r3 of the radial direction inner end of the vehicle width direction outer end surface 22a of the outer race 22.
The hub inner peripheral surface 12a of the hub 12 includes: a first region 34 that supports the outer peripheral surface 22c of the outer race 22 of the outer roller bearing 14; and a second region 35 extending outward in the vehicle width direction and continuing from the first region 34. The second region 35 of the hub inner peripheral surface 12a defines an oil chamber 36 between the housing outer peripheral surface 11a of the axle housing 11 on the vehicle width direction outer side than the outer roller bearing 14. A seal member 37 is provided on the vehicle width direction outer side of the oil chamber 36, and the vehicle width direction outer side of the oil chamber 36 is closed by the seal member 37. The oil chamber 36 communicates with the rollers 23 side of the outer roller bearing 14 via a space 38 and a space 39, the space 38 being a space between the outer peripheral surface of the nut flange portion 26 of the hub nut 15 and the hub inner peripheral surface 12a of the hub 12, and the space 39 being a space between the vehicle width direction inner end surface 31 of the hub nut 15 and the vehicle width direction outer end surface 22a of the outer race 22 of the outer roller bearing 14.
In the above configuration, the radially outer region 33 of the vehicle width direction inner end surface 31 of the nut flange portion 26 is opposed to the vehicle width direction outer end surface 22a of the outer race 22 of the outer roller bearing 14 at a position separated outward in the vehicle width direction by the distance L1 from the vehicle width direction outer end surface 22 a. Therefore, even if the rollers 23 of the outer roller bearing 14 are broken and the outer race 22 of the outer roller bearing 14 moves outward in the vehicle width direction with respect to the inner race 21, the vehicle width direction outer end surface 22a of the outer roller bearing 22 of the outer roller bearing 14 abuts against the vehicle width direction inner end surface 31 (the region 33 on the outer diameter side) of the nut flange portion 26, and therefore, the movement of the hub 12 outward in the vehicle width direction can be restricted by this abutment.
Further, the vehicle width direction inner end surface 31 of the nut flange portion 26 is formed in a flat shape orthogonal to the shaft center CL of the axle housing 11, and a radially inner region 32 of the vehicle width direction inner end surface 31 of the nut flange portion 26 abuts against the vehicle width direction outer end surface 21a of the inner race 21 of the outer roller bearing 14. Therefore, the outer race 22 can be restricted from moving outward in the vehicle width direction to the vehicle width position of the outer end surface 21a of the inner race 21 when the rollers 23 of the outer roller bearing 14 are damaged. That is, by appropriately setting the vehicle-widthwise separation distance L1 between the vehicle-widthwise outer end surface 22a of the outer race 22 of the outer roller bearing 14 and the vehicle-widthwise inner end surface 31 of the nut flange portion 26, the movement distance of the hub 12 outward in the vehicle-widthwise direction when the rollers 23 of the outer roller bearing 14 are damaged can be suppressed.
Therefore, the movement distance of the wheel hub 12 outward in the vehicle width direction when the rollers 23 of the outer roller bearing 14 are broken can be suppressed, and the wheel hub 12 can be prevented from coming off the axle housing 11.
Further, since the outer race 22 of the outer roller bearing 14 does not move further outward in the vehicle width direction than the inner race 21, the moving distance of the outer race 18 of the inner roller bearing 13 outward in the vehicle width direction with respect to the inner race 17 can be suppressed to a short distance to the extent that the outer race 18 of the inner roller bearing 13 does not slip out outward in the vehicle width direction from the inner race 17 side. Therefore, even if the rollers 23 of the outer roller bearing 14 are broken, the hub 12 can be rotatably supported with respect to the axle housing 11 by the inner roller bearing 13.
In the present embodiment, the vehicle width direction separation distance L1 between the vehicle width direction outer end surface 22a of the outer race 22 and the vehicle width direction outer end surface 21a of the inner race 21 is set to the following distance: even if the outer race 18 of the inner roller bearing 13 moves outward in the vehicle width direction with respect to the inner race 17, the plurality of rollers 19, and the cage 20, the wheel hub 12 can be rotatably supported with respect to the axle housing 11 by the inner roller bearing 13 (the function as the inner roller bearing 13 can be ensured). Therefore, even if the rollers 23 of the outer roller bearing 14 are broken, the hub 12 can be reliably supported by the inner roller bearing 13 to be rotatable with respect to the axle housing 11.
The oil chamber 36 communicates with the rollers 23 side of the outer roller bearing 14 via a space 38 and a space 39, the space 38 being a space between the outer peripheral surface of the nut flange portion 26 of the hub nut 15 and the hub inner peripheral surface 12a of the hub 12, and the space 39 being a space between the vehicle width direction inner end surface 31 of the hub nut 15 and the vehicle width direction outer end surface 22a of the outer race 22 of the outer roller bearing 14. Therefore, the oil can be reliably supplied from the oil chamber 36 to the outer roller bearing 14.
Further, the outer diameter of the nut flange portion 26 is set to the following size: even if the rollers 23 of the outer roller bearing 14 are broken and the hub 12 rotates about a shaft inclined with respect to the axial center CL of the drive shaft 4 (even if the shaft rotates in a wobbling state), the hub inner peripheral surface 12a (second region 35) of the hub 12 does not abut against the hexagonal outer edge of the nut body 25 (does not abut against the nut flange 26 due to interference therewith). Therefore, if the rollers 23 of the outer roller bearing 14 are broken and the hub 12 rotates about an axis inclined with respect to the axial center CL of the drive shaft 4, it is possible to prevent the generation of noise due to the contact between the hub inner peripheral surface 12a of the hub 12 and the hexagonal corners of the nut body 25.
In the present embodiment, the outer shape of the nut main body portion 25 of the hub nut 15 is a regular hexagon, but the present invention is not limited thereto, and various shapes can be applied.
The present invention has been described above based on the above embodiments, but the present invention is not limited to the contents of the above embodiments, and it goes without saying that the present invention can be appropriately modified without departing from the scope of the present invention. That is, it is needless to say that other embodiments, examples, operation techniques, and the like completed by those skilled in the art based on the present embodiment are all included in the scope of the present invention.
This application is based on the Japanese patent application (Japanese patent application No. 2020-032375), filed on 27/02/2020 and the contents of which are hereby incorporated by reference.
Industrial applicability
The wheel hub anti-disengaging structure of this disclosure can be applied to the wheel hub anti-disengaging structure of vehicle widely.
Description of the reference numerals
11: vehicle axle housing
11a: outer peripheral surface of the housing
12: wheel hub
12a: inner peripheral surface of hub
13: inner roller bearing
14: outboard roller bearing
15: hub nut (nut)
17: inner race of inboard roller bearing
18: outer race of inboard roller bearing
19: plurality of rollers of inner roller bearing
21: inner race of outboard roller bearing
21a: outer end surface of inner race of outer roller bearing in vehicle width direction
22: outer race of outboard roller bearing
22a: outer end surface of outer race of outer roller bearing in vehicle width direction
22c: outer peripheral surface of outer race of outer roller bearing
23: multiple rollers of outboard roller bearing
25: nut body
25a: threaded hole
26: nut flange part
31: inner end surface of nut flange in vehicle width direction
32: the nut flange part has an inner diameter side region of the inner end surface in the vehicle width direction
33: the nut flange part has a region on the outer diameter side of the inner end surface in the vehicle width direction
34: first region of inner peripheral surface of hub
35: second region of the inner peripheral surface of the hub
36: an oil chamber.
Claims (3)
1. A hub anti-drop structure is characterized in that,
the method comprises the following steps:
a cylindrical axle housing extending in a vehicle width direction;
an annular hub having a hub inner peripheral surface defining an insertion hole through which the axle housing is inserted and opposed to a housing outer peripheral surface of the axle housing;
two roller bearings each having an annular inner race supported on the outer peripheral surface side of the housing, an annular outer race disposed radially outward of the inner race and supported on the inner peripheral surface side of the hub, and a plurality of rollers disposed between the inner race and the outer race, the two roller bearings being disposed so as to be separated from each other in the vehicle width direction and rotatably supporting the hub with respect to the axle housing; and
a nut that is fastened to the outer peripheral surface of the case of the axle housing in a state of being in contact with the outer end surface in the vehicle width direction of the inner race of the outer roller bearing on the outer side in the vehicle width direction of the two roller bearings, and that restricts the inner race of the outer roller bearing from moving outward in the vehicle width direction,
the outer end surface of the outer race of the outer roller bearing in the vehicle width direction is positioned on the inner side in the vehicle width direction than the outer end surface of the inner race of the outer roller bearing in the vehicle width direction,
the nut has a nut body portion formed with a threaded hole, and a disc-shaped nut flange portion extending radially outward from an inner end portion of the nut body portion in the vehicle width direction,
the nut flange portion has, on its inner end surface in the vehicle width direction: an inner diameter side region abutting against the outer end surface of the inner race of the outer roller bearing in the vehicle width direction; and a region on an outer diameter side opposed to the outer end surface of the outer race at a position separated outward in the vehicle width direction from the outer end surface of the outer race of the outer roller bearing, a vehicle width direction inner end surface of the nut flange portion being formed in a planar shape orthogonal to an axial direction of the axle housing.
2. The wheel hub separation prevention structure of claim 1,
a separation distance in the vehicle width direction of the outer end surface of the outer race of the outer roller bearing and the inner end surface of the nut flange portion in the vehicle width direction is set to a distance: the inner roller bearing is capable of rotatably supporting the hub with respect to the axle housing even if an outer race of an inner roller bearing on an inner side in the vehicle width direction of the two roller bearings moves outward in the vehicle width direction with respect to an inner race of the inner roller bearing.
3. The wheel hub separation prevention structure of claim 1 or 2,
the hub inner peripheral surface of the hub includes: a first region that supports an outer peripheral surface of the outer race of the outer roller bearing; and a second region extending outward in the vehicle width direction continuously from the first region,
the second region of the inner peripheral surface of the hub extends outward in the vehicle width direction than the nut and defines an oil chamber for storing oil supplied to the outer roller bearing,
the outer diameter of the nut flange portion is smaller than the inner diameter of the second region of the hub inner peripheral surface.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020032375A JP7212866B2 (en) | 2020-02-27 | 2020-02-27 | Structure to prevent hub from coming off |
| JP2020-032375 | 2020-02-27 | ||
| PCT/JP2021/006742 WO2021172312A1 (en) | 2020-02-27 | 2021-02-24 | Structure to prevent hub from slipping out |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115176092A true CN115176092A (en) | 2022-10-11 |
Family
ID=77489991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180016897.5A Withdrawn CN115176092A (en) | 2020-02-27 | 2021-02-24 | Wheel hub anti-disengaging structure |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7212866B2 (en) |
| CN (1) | CN115176092A (en) |
| WO (1) | WO2021172312A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847503U (en) * | 1981-09-28 | 1983-03-30 | 株式会社神崎高級工機製作所 | Mobile work vehicle axle device |
| JP2000006609A (en) * | 1998-06-25 | 2000-01-11 | Isuzu Motors Ltd | Vehicular tire supporting structure |
| DE19956838C1 (en) * | 1999-11-26 | 2000-12-28 | Bpw Bergische Achsen Kg | Wheel mounting for trailer axle has sleeve enclosing axle shaft between inner bearing rings of front and rear roller bearings for wheel hub |
| CN1835851A (en) * | 2003-06-13 | 2006-09-20 | Bpw矿用轴公司 | Wheel bearing for a vehicle axle |
| CN103912587A (en) * | 2014-04-12 | 2014-07-09 | 山东浩信机械有限公司 | Wheel end assembly for commercial vehicle |
| CN209838980U (en) * | 2019-05-15 | 2019-12-24 | 福赛轴承（嘉兴）有限公司 | Maintenance-free tapered roller bearing of truck axle hub |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847503A (en) * | 1981-09-16 | 1983-03-19 | Hitachi Ltd | Roll bearing device for rolling mill |
| US4480854A (en) * | 1982-11-08 | 1984-11-06 | Gateway Industries, Inc. | Free-falling, self-locking adjustable tip assembly |
| JPS59111704U (en) * | 1983-01-19 | 1984-07-27 | ダイハツ工業株式会社 | Support structure of vehicle axle hub |
| JP5847503B2 (en) | 2010-09-21 | 2016-01-20 | 日本エステル株式会社 | Manufacturing method of molded products |
| JP6071499B2 (en) * | 2012-12-06 | 2017-02-01 | 日野自動車株式会社 | Bearing structure |
-
2020
- 2020-02-27 JP JP2020032375A patent/JP7212866B2/en active Active
-
2021
- 2021-02-24 WO PCT/JP2021/006742 patent/WO2021172312A1/en active Application Filing
- 2021-02-24 CN CN202180016897.5A patent/CN115176092A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847503U (en) * | 1981-09-28 | 1983-03-30 | 株式会社神崎高級工機製作所 | Mobile work vehicle axle device |
| JP2000006609A (en) * | 1998-06-25 | 2000-01-11 | Isuzu Motors Ltd | Vehicular tire supporting structure |
| DE19956838C1 (en) * | 1999-11-26 | 2000-12-28 | Bpw Bergische Achsen Kg | Wheel mounting for trailer axle has sleeve enclosing axle shaft between inner bearing rings of front and rear roller bearings for wheel hub |
| CN1835851A (en) * | 2003-06-13 | 2006-09-20 | Bpw矿用轴公司 | Wheel bearing for a vehicle axle |
| CN103912587A (en) * | 2014-04-12 | 2014-07-09 | 山东浩信机械有限公司 | Wheel end assembly for commercial vehicle |
| CN209838980U (en) * | 2019-05-15 | 2019-12-24 | 福赛轴承（嘉兴）有限公司 | Maintenance-free tapered roller bearing of truck axle hub |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7212866B2 (en) | 2023-01-26 |
| WO2021172312A1 (en) | 2021-09-02 |
| JP2021134871A (en) | 2021-09-13 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20221011 |
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| WW01 | Invention patent application withdrawn after publication |