WO2010044344A1 - Appareil de palier de roue - Google Patents

Appareil de palier de roue Download PDF

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Publication number
WO2010044344A1
WO2010044344A1 PCT/JP2009/067027 JP2009067027W WO2010044344A1 WO 2010044344 A1 WO2010044344 A1 WO 2010044344A1 JP 2009067027 W JP2009067027 W JP 2009067027W WO 2010044344 A1 WO2010044344 A1 WO 2010044344A1
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WO
WIPO (PCT)
Prior art keywords
hub
hole
convex
joint member
concave
Prior art date
Application number
PCT/JP2009/067027
Other languages
English (en)
Japanese (ja)
Inventor
清武 柴田
清茂 山内
小澤　仁博
Original Assignee
Ntn株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP2008284525A external-priority patent/JP5349912B2/ja
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2010044344A1 publication Critical patent/WO2010044344A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0094—Hubs one or more of the bearing races are formed by the hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0005—Hubs with ball bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0015—Hubs for driven wheels
    • B60B27/0021—Hubs for driven wheels characterised by torque transmission means from drive axle
    • B60B27/0026—Hubs for driven wheels characterised by torque transmission means from drive axle of the radial type, e.g. splined key
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0015—Hubs for driven wheels
    • B60B27/0036—Hubs for driven wheels comprising homokinetic joints
    • B60B27/0042—Hubs for driven wheels comprising homokinetic joints characterised by the fixation of the homokinetic joint to the hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0078—Hubs characterised by the fixation of bearings
    • B60B27/0084—Hubs characterised by the fixation of bearings caulking to fix inner race
    • 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
    • F16C35/0635—Fixing them on the shaft the bore of the inner ring being of special non-cylindrical shape which co-operates with a complementary shape on the shaft, e.g. teeth, polygonal sections
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D1/108—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/103—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
    • F16D2003/22326—Attachments to the outer joint member, i.e. attachments to the exterior of the outer joint member or to the shaft of the outer joint member
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/12—Mounting or assembling

Definitions

  • This invention relates to a wheel bearing device for rotatably supporting a wheel with respect to a vehicle body in a vehicle such as an automobile.
  • the wheel bearing device has evolved from a structure in which a double-row rolling bearing called a first generation is used alone to a second generation in which a vehicle body mounting flange is integrated with an outer member.
  • the third generation in which one inner raceway (inner race) of a double row rolling bearing is formed on the outer periphery of the hub having an integral, and the hub and the constant velocity universal joint are integrated.
  • the fourth generation in which the other inner raceway (inner race) of the double row rolling bearing is formed on the outer periphery of the outer joint member to be formed.
  • Patent Document 1 describes a third-generation wheel bearing device. As shown in FIG. 12, the wheel bearing device includes a hub 102 having a flange 101 extending in the outer diameter direction, a constant velocity universal joint 104 in which an outer joint member 103 is fixed to the hub 102, and an outer peripheral side of the hub 102. The outer member 105 is provided.
  • the constant velocity universal joint 104 includes the outer joint member 103, an inner joint member 108 housed in the bowl-shaped portion 107 of the outer joint member 103, and a ball interposed between the inner joint member 108 and the outer joint member 103. 109 and a holder 110 that holds the ball 109.
  • a spline 111 is formed on the inner peripheral surface of the center hole of the inner joint member 108, and is splined to a spline shaft of a shaft (not shown).
  • the hub 102 has a cylindrical portion 113 and the flange 101, and a short cylindrical pilot portion 115 for mounting a wheel and a brake rotor (not shown) on the outer end surface (end surface on the opposite joint side) 114 of the flange 101. Is formed.
  • the pilot portion 115 includes a large-diameter first portion 115a and a small-diameter second portion 115b. The brake rotor is fitted to the first portion 115a and the wheel is fitted to the second portion 115b.
  • a small-diameter portion 116 is provided on the outer peripheral surface of the cylindrical portion 113 on the side of the saddle-shaped portion 107, and an inner ring 117 is fitted to the small-diameter portion 116.
  • a first inner race (inner race) 118 is formed near the flange on the outer peripheral surface of the cylindrical portion 113 of the hub 102, and a second inner race (inner race) 119 is formed on the outer peripheral surface of the inner ring 117.
  • the flange 101 of the hub 102 has a bolt mounting hole 112, and the wheel and brake rotor are fixed to the flange 101 by a hub bolt (not shown) implanted in the bolt mounting hole 112.
  • the outer member 105 has two rows of outer tracks (outer races) 120 and 121 formed on the inner periphery, and a flange (vehicle body mounting flange) 132 formed on the outer periphery.
  • the first inner track 118 of the hub 102 and the first outer track 120 of the outer member 105 face each other, and the second inner track 119 of the inner ring 117 and the second outer track 121 of the outer member 105 face each other.
  • Two rows of rolling elements 122 are interposed therebetween.
  • a spline portion 126 is formed on the inner peripheral surface of the cylindrical portion 113 of the hub 102.
  • the shaft portion 123 has a screw portion 124 formed at the tip, and a spline portion 125 is formed between the screw portion 124 and the hook-shaped portion 107. Then, the shaft portion 123 of the outer joint member 103 is inserted into the cylindrical portion 113 of the hub 102, and the spline portion 125 of the shaft portion 123 and the spline portion 126 of the hub 102 are engaged with each other, whereby the hub 102 and the outer joint member 103 are connected. It can be coupled to transmit torque.
  • the object of the present invention is to suppress circumferential play, and the hub and the outer joint member of the constant velocity universal joint can be separated and reassembled, and the hub and the outer joint member of the constant velocity universal joint can be separated.
  • An object of the present invention is to provide a wheel bearing device that is easy to assemble and is low in cost.
  • the present invention includes an outer member having a double row outer race on the inner periphery, a hub provided with a flange for attaching a wheel, and an inner member having a double row inner race facing the outer race.
  • an axially extending convex portion provided on either the inner peripheral surface of the hub or the outer peripheral surface of the shaft portion of the outer joint member is provided along the axial direction.
  • a concave and convex fitting structure is formed in which the whole of the fitting contact portion between the convex portion and the concave portion is in close contact with each other by forming a concave portion that is press-fitted into the other portion and is closely fitted to the convex portion by the convex portion.
  • Fastening the shaft of the member with bolts The hub and the outer joint member can be separated and reassembled, and the hub is provided with a through hole for opening the hole and through which the bolt is inserted, and the through hole is formed with respect to the hole of the hub.
  • the coaxiality is defined to be 1.0 mm or less.
  • Coaxiality refers to the magnitude of deviation from the datum axis line that should be on the same line as the datum axis line (theoretical accurate line set by the reference axis). This coaxiality is expressed by the diameter of the smallest cylinder among the geometric cylinders that include all the axes and are coaxial with the datum axis line. Coaxiality is a deviation with respect to the position of two axes, and since the axis must be determined from the surface of a rotationally symmetric body having a shape deviation in general, precise measurement requires labor and time.
  • the axial straight line of the reference portion A of the object to be measured matches the rotation axis.
  • the center of the cylindrical body B in the cross section is determined by moving the object to be measured or the stylus in the direction of the rotation axis and recording a circular recording diagram in the necessary cross section.
  • the coaxiality twice the distance from the center of rotation to the center of the farthest point is the coaxiality ("revised precision measurement (2)", January 15, 1985, 20th edition, stock Issued by the company Corona).
  • the degree of coaxiality or coincidence is defined as the degree to which the axes of two mechanical parts arranged so as to have a common axis do not coincide.
  • the bolts are inserted from the through holes formed in the hub and the hub and the outer joint member are fastened, whereby the axial direction of the shaft portion of the outer joint member from the hub is restricted.
  • a jig is fixed to the hub flange using a hub bolt, and the pulling force is applied by the jig.
  • the shaft portion of the outer joint member can be inserted into the hole of the hub, and the outer joint member can be pulled by turning the bolt.
  • the hub can be provided with an inner wall having a through hole, and a seating surface for the bolt can be formed on the side opposite to the hole on the inner wall of the hub. Thereby, the screwing state of the bolt is stabilized. Under the present circumstances, you may form the receiving surface which contacts the front-end
  • the convex portion of the concave-convex fitting structure is provided on the shaft portion of the outer joint member, and at least the hardness of the end portion in the axial direction of the convex portion is made higher than the inner diameter portion of the hole portion of the hub.
  • the shaft portion is press-fitted into the hole portion of the hub from the axial end side of the convex portion, and the convex portion is formed with a concave portion that closely fits the convex portion on the inner peripheral surface of the hole portion of the hub. Can also be configured.
  • the convex part bites into the concave part forming surface on the other side (the inner peripheral surface of the hole part of the hub), so that the hole part is slightly expanded in diameter and allows the convex part to move in the axial direction.
  • the hole portion is reduced in diameter to return to the original diameter.
  • the hardness difference between the hub and the outer joint member is 20 points or more in terms of HRC (Rockwell hardness C scale).
  • a convex part of the concave-convex fitting structure is provided on the shaft part of the outer joint member, and the hardness of the axial end part of this convex part is made higher than the inner diameter part of the hole part of the hub so that the shaft part becomes the hole part of the hub. If it press-fits from the axial direction edge part side of a convex part, the hardness by the side of a shaft part can be made high and the rigidity of a shaft part can be improved.
  • the inner member is composed of, for example, a hub and an inner ring each having one row of inner races. Both can be fixed by fitting the inner ring to the hub and caulking the end of the hub. By caulking the end portion of the hub, the interval between the two inner races is reduced, and bearing preload is applied. Thus, since the preload is applied to the bearing by caulking the end of the hub, the outer joint member does not need to be involved in the bearing preload. For this reason, it is possible to press-fit the shaft portion of the outer joint member without considering the bearing preload, and it is possible to improve the connectivity (assembly property) between the hub and the outer joint member.
  • Various types of caulking are known, and an example is swing caulking.
  • a small diameter in which a storage portion for storing a protruding portion generated by forming a concave portion by press-fitting is provided on the outer diameter side of the shaft portion on the anti-joint side than the concave-convex fitting structure, and the storage portion is formed at the tip of the shaft portion of the outer joint member It is preferably formed by a stepped portion and a hub.
  • the protruding portion is a material content of the capacity of the concave portion into which the concave portion fitting portion of the convex portion is inserted, and is extruded from the formed concave portion, cut to form the concave portion, or extruded. It consists of both the cut and the cut.
  • the outer diameter of the small diameter step portion forming the storage portion is larger than the inner diameter of the through hole of the hub.
  • the protruding portion By providing a storage portion for storing the protruding portion that is generated by forming the concave portion by press-fitting, the protruding portion can be held (maintained) in the storage portion, and the protruding portion does not enter the inside of the vehicle outside the apparatus. .
  • the protruding portion can be kept stored in the storage portion, and it is not necessary to perform the removal processing of the protruding portion, the number of assembling work can be reduced, and the assembling workability can be improved and the cost can be reduced. You can plan.
  • the concave / convex fitting portion is disposed at a position avoiding a position directly below the raceway surface of the rolling bearing. That is, when the shaft portion of the outer joint member is press-fitted into the hole portion of the hub, the hub expands. By this expansion, a hoop stress is generated on the raceway surface (inner race) of the rolling bearing.
  • the hoop stress refers to a force for expanding the diameter in the outer diameter direction.
  • a large-diameter portion having an inner diameter larger than the outer diameter of the convex portion of the shaft portion and having irregularities formed in the circumferential direction may be provided in the hole portion of the hub.
  • the large diameter portion is located on the joint side with respect to the fitting hole into which the shaft portion of the outer joint member is press-fitted, and acts as a guide groove when the shaft portion is press-fitted. That is, when reassembling after separation, it becomes easy to press-fit the convex portion into the concave portion formed last time, and the stability of reassembly can be improved without causing misalignment or inclination.
  • a screw hole is provided along the axial direction in the shaft core portion of the shaft portion of the outer joint member, and when the hub and the shaft portion of the outer joint member are separated from each other, the axial force is applied to the bolt screwed into the screw hole. By imparting, separation force can be generated in the outer joint member.
  • a detachable jig having a female screw is detachably attached to the hub, and the bolt is pressed by screwing of a pressing bolt member screwed into the female screw of the detaching jig. Can be performed.
  • the screw thread direction between the screw hole of the shaft portion of the outer joint member and the female screw of the detachment jig is opposite. Accordingly, by pushing the bolt member for pressing, a pressing force in the axial direction can be applied to the bolt, and the hub wheel and the shaft portion of the outer joint member can be separated. At this time, if the screw thread direction of the female screw to which the pressing bolt member is screwed and the screw hole to which the bolt is screwed are the same, the bolt rotates together when the pressing bolt member is screwed, The bolt will also be screwed into the screw hole.
  • the separating force can be applied without rotating the screw, but the bolt is screwed until the tip of the bolt reaches the bottom of the screw hole. It takes a lot of work time. Further, in order to reach the tip of the bolt to the bottom of the screw hole, it is necessary to increase the length of the bolt, resulting in poor handling.
  • the bolt rotates together even if the pressing bolt member is screwed. There is no such thing, and a pressing force can be reliably applied to the bolt.
  • the bolt can be used as it is at the time of separation, so that the separation workability can be improved and the cost can be reduced.
  • the concave / convex fitting structure has the entire fitting contact portion between the convex portion and the concave portion in close contact with each other, so that in this fitting structure, there is a gap in which play occurs in the radial direction and the circumferential direction.
  • the outer joint member can be removed from the hole of the hub by applying an axial pulling force to the shaft portion of the outer joint member.
  • the entire fitting contact portion between the convex portion and the concave portion is brought into close contact.
  • the concave-convex fitting structure can be reconfigured.
  • the wheel bearing device of the present invention can be separated and reassembled. Then, by increasing the coaxiality of the through hole of the hub with respect to the hole of the hub, specifically, by defining it to be 1.0 mm or less, the relative movement in the axial direction of the hub and the outer joint member during separation and reassembly is performed. Can be smoothly performed using a bolt.
  • the inner diameter of the hub's through-holes should be controlled so that the clearance between the bolt's corresponding part and the outer diameter is small. desirable.
  • the outer joint member By applying an axial pulling force to the shaft portion of the outer joint member, the outer joint member can be removed from the hole of the hub, so that the workability (maintenability) of repair and inspection of each part is improved. be able to.
  • a convex portion provided on either the outer peripheral surface of the shaft portion of the outer joint member or the inner peripheral surface of the hole portion of the hub is press-fitted into the other along the axial direction, thereby closely fitting to the convex portion.
  • a recess can be formed. For this reason, an uneven
  • productivity is improved, and work efficiency is improved because it is not necessary to align the phases of the splines during assembly. Damage to the tooth surface during press-fitting can be avoided, and a stable fitting state can be maintained.
  • the shaft Since the structure is fastened with bolts, the shaft is prevented from coming off from the hub, and stable torque transmission is possible over a long period of time.
  • the inner wall of the hub was sandwiched between the end face of the shaft portion of the outer joint member and the head of the bolt and used as a positioning means, so that the bolt fixing was stabilized and positioned.
  • the dimensional accuracy of the wheel bearing device can be stabilized, and the axial length of the concave-convex fitting structure disposed along the axial direction can be secured to improve the torque transmission performance. Can be planned.
  • FIG. 2 shows the wheel bearing device of the first embodiment.
  • This wheel bearing device is a unit in which a hub 1, a double-row rolling bearing 2, and a constant velocity universal joint 3 are unitized, and the constant velocity universal joint 3 inserted into the hub 1 and the hole 22 of the hub 1.
  • the shaft portion 12 of the outer joint member is connected through the concave-convex fitting structure M so as to be separable.
  • the constant velocity universal joint 3 includes an outer joint member 5, an inner joint member 6, a plurality of balls 7 as torque transmitting elements, and a cage 8 that holds the balls 7. It is said.
  • the inner joint member 6 is spline-fitted by press-fitting the end portion 10a of the shaft 10 into the shaft hole inner diameter 6a, and is coupled to the shaft 10 so that torque can be transmitted.
  • a retaining ring 9 for preventing the shaft from coming off is fitted to the end of the shaft 10.
  • the outer joint member 5 includes a mouth portion 11 and a shaft portion (stem portion) 12, and a back face 11a is formed at a boundary portion between the two.
  • the mouse portion 11 has a bell shape with an end on the opposite side to the shaft portion 12 and has a spherical inner peripheral surface 13.
  • a plurality of track grooves 14 extending in the axial direction are formed on the inner peripheral surface 13 at equal intervals in the circumferential direction.
  • the inner joint member 6 has a spherical outer peripheral surface 15, and a plurality of track grooves 16 extending in the axial direction are formed at equal intervals in the circumferential direction on the outer peripheral surface 15.
  • the inner joint member 6 is spline-fitted with the spline shaft portion 10a of the shaft 10 through the spline hole 6a and is coupled to the shaft 10 so as to transmit torque.
  • a retaining ring 9 is provided on the spline shaft portion 10a to prevent it from coming off.
  • the track groove 14 of the outer joint member 5 and the track groove 16 of the inner joint member 6 form a pair, and one ball 7 is incorporated in the ball track constituted by each pair of track grooves 14 and 16 so that the balls 7 can roll. It is.
  • the ball 7 is interposed between the track groove 14 of the outer joint member 5 and the track groove 16 of the inner joint member 6 to transmit torque. All balls 7 are held in the same plane by the cage 8.
  • the cage 8 is slidably interposed between the inner peripheral surface 13 of the outer joint member 5 and the outer peripheral surface 15 of the inner joint member 6, and is in contact with the inner peripheral surface 13 of the outer joint member 5 at the outer peripheral surface. In contact with the outer peripheral surface 15 of the inner joint member 6.
  • a Rzeppa type is shown as an example of a fixed type constant velocity universal joint.
  • an undercut free type having a straight straight portion at the groove bottom of each track groove 14, 16 and other constant velocity universal joints. It may be.
  • the opening of the mouse portion 11 is closed with a boot 18 in order to prevent leakage of the lubricating grease filled in the interior and to prevent water and foreign matter from entering from the outside.
  • the boot 18 includes a large diameter portion 18a, a small diameter portion 18b, and a bellows portion 18c that connects the large diameter portion 18a and the small diameter portion 18b.
  • the large diameter portion 18a is attached to the outer periphery of the opening end portion of the mouse portion 11 and is fastened with a boot band 19a.
  • the small diameter portion 18b is mounted on the boot mounting portion 10b of the shaft 10 and fastened with a boot band 19b.
  • the hub 1 includes a cylindrical portion 20 and a flange 21.
  • the flange 21 is provided at the end of the cylindrical portion 20 on the side opposite to the joint (outboard side).
  • the hub 1 has a hole 22 and a tapered hole 22b that are partitioned by an inner wall 22c.
  • the inner wall 22c is in the form of an inward flange, and has a through hole 56 at the center.
  • the hole 22 is located on the joint side (inboard side) with the inner wall 22c as a boundary, and the tapered hole 22b on the anti-joint side. Is located.
  • a counterbore, that is, a seating surface 51 is formed on the surface of the inner wall 22c on the tapered hole 22b side.
  • the surface on the hole 22 side of the inner wall 22c serves as a receiving surface 53 that contacts the end surface 52 of the shaft portion 12 of the outer joint member.
  • the hole portion 22 includes a fitting hole 22a and a large diameter portion 46 and a small diameter portion 48 arranged on both sides thereof.
  • the large diameter portion 46 is located on the opening side of the fitting hole 22a
  • the small diameter portion 48 is located on the inner wall 22c side of the fitting hole 22a.
  • a tapered portion (tapered hole) 49a is provided between the large diameter portion 46 and the fitting hole 22a (FIG. 6).
  • the taper part 49a is reduced in diameter in the press-fitting direction when the hub 1 and the shaft part 12 of the outer joint member 5 are coupled.
  • the angle ⁇ of the tapered portion 49a is 15 ° to 75 °.
  • a tapered portion 49 b is also provided between the fitting hole 22 a and the small diameter portion 48.
  • the rolling bearing 2 is mainly composed of an inner member (1, 24) corresponding to a bearing inner ring, an outer member 25 corresponding to a bearing outer ring, and a ball 30 as a rolling element.
  • the inner member is composed of the hub 1 and the inner ring 24.
  • the inner ring 24 is fitted to a small diameter portion 23 formed on the joint side of the cylindrical portion 20 of the hub 1.
  • the hub 1 and the inner ring 24 each have a first inner raceway surface (inner race) 28 and a second inner raceway surface (inner race) 29.
  • the outer member 25 has two rows of outer raceways (outer races) 26 and 27 on the inner periphery.
  • the outer member 25 is attached to a knuckle 34 (see FIG.
  • seal members S 1 and S 2 are attached to the opening portions at both ends of the outer member 25.
  • the end of the small diameter portion 23 of the hub 1 is caulked and plastically deformed radially outward, and the inner ring 24 is fixed in the axial direction with the caulking portion 31 applied to the end surface of the inner ring 24.
  • a predetermined preload is applied to the rolling bearing 2.
  • the mouth portion 11 of the outer joint member 5 and the end portion of the hub 1 (in this case, the caulking portion 31) are not in contact with each other, and a gap 58 exists between them (see FIG. 2).
  • a hub bolt 33 is implanted in a bolt mounting hole 32 in the flange 21 of the hub 1, and the wheel and brake rotor are fixed to the flange 21 by the hub bolt 33.
  • the shaft portion 12 of the outer joint member 5 of the constant velocity universal joint is composed of a main body portion 12a and a small-diameter portion 12b on the distal end side, and a screw hole 50 is formed in the shaft center portion.
  • the opening end portion of the screw hole 50 is a tapered portion 50a that expands toward the end face side of the shaft portion 12 (see FIG. 6).
  • a plurality of convex portions 35 extending in the axial direction are formed at a predetermined pitch in the circumferential direction on the outer peripheral surface of the shaft portion 12 on the side opposite to the mouse.
  • a plurality of axially extending recesses 36 are formed at a predetermined pitch in the circumferential direction.
  • the convex-concave fitting structure M is formed by the convex portion 35 and the concave portion 36, and the entire fitting contact portion 38 between the convex portion 35 and the concave portion 36 is in close contact. That is, the convex portion 35 and the concave portion 36 formed thereby are tight-fitted over the entire circumference.
  • the convex portion 35 has a triangular shape (mountain shape) having a convex arcuate cross section.
  • the fitting contact part 38 of the convex part 35 and the recessed part 36 is a range from the mountain-shaped middle part to the mountain peak in the cross section, as shown by the symbol A. Further, a gap 40 exists between the convex portions 35 adjacent in the circumferential direction on the inner diameter side of the inner peripheral surface 37 of the fitting hole 22a of the hub 1.
  • the hub 1 and the shaft portion 12 of the outer joint member 5 are in a relationship capable of transmitting torque via the concave-convex fitting structure M.
  • a spline (or serration, the same applies hereinafter) 41 is formed on the shaft portion 12 of the outer joint member 5.
  • This is a so-called male spline composed of convex teeth 41a and concave teeth 41b along the axial direction, and the convex teeth 41a become the convex portions 35 of the concave-convex fitting structure M.
  • the spline 41 is a small tooth with a module of 0.5 or less.
  • the module is a value obtained by dividing the pitch circle diameter by the number of teeth.
  • heat treatment is performed on the outer periphery of the shaft portion 12 to form a hardened layer H.
  • the spline 41 is provided on the small diameter portion 12b side of the main body portion 12a of the shaft portion 12, and the hardened layer H extends to the entire spline 41 and a part of the back face 11a of the outer joint member 5.
  • various heat treatments such as induction hardening and carburizing and quenching can be employed.
  • induction hardening is a hardening method that applies the principle of heating a conductive object by placing Joule heat in a coil through which high-frequency current flows, and generating Joule heat by electromagnetic induction. is there.
  • carburizing and quenching is a method in which carbon is infiltrated / diffused from the surface of a low carbon material and then quenched.
  • the inner peripheral surface 37 of the hole portion 22 of the hub 1, that is, the inner peripheral surface of the fitting hole 22 a is not subjected to a curing process and is set to an uncured portion (unburned state).
  • the hardness difference between the hardened layer H of the shaft portion 12 of the outer joint member 5 and the uncured portion of the hub 1 is 20 points or more in terms of HRC (Rockwell hardness C scale). If a specific example is given, the hardness of the hardened layer H shall be about 50 HRC to 65 HRC, and the hardness of an unhardened part shall be about 10 HRC to about 30 HRC.
  • the projecting direction intermediate portion of the convex portion 35 corresponds to the position of the concave surface where the concave portion is formed, that is, the inner peripheral surface 37 of the fitting hole 22a here. If expressed by the dimensional relationship of D, D1, and D2 shown in FIG. 6, D2 ⁇ D ⁇ D1.
  • D is the inner diameter of the inner peripheral surface 37 of the fitting hole 22a
  • D1 is the maximum outer diameter of the convex portion 35, that is, the maximum diameter of the circle connecting the vertices of the convex portion 35 which are the convex teeth 41a of the spline 41 (circumscribed circle) Diameter)
  • D2 is the outer diameter of the outer peripheral surface of the shaft portion between the convex portions, that is, the maximum diameter of a circle connecting the bottoms of the concave teeth 41b of the spline 41.
  • D3 is the inner diameter of the large-diameter hole 46 of the hole 22 and has a relationship of D1 ⁇ D3.
  • the structure and processing method of splines are well known (see JIS B 0006: 1993). For example, it can be formed by various processing methods such as rolling, cutting, pressing, and drawing. As the surface hardening treatment, various heat treatments such as induction hardening and carburizing and quenching can be employed.
  • the shaft portion 12 of the outer joint member 5 is inserted into the hole 22 of the hub 1,
  • the shaft portion 12 is press-fitted into the perfect circular fitting hole 22 a of the hub 1.
  • the taper part 49a plays a role of guiding the tip of the shaft part 12, and the shaft part 12 can be press-fitted into the fitting hole 22a without causing a shift.
  • the angle ⁇ of the tapered portion 49a is preferably 15 ° to 75 ° as described above. If the angle is less than 15 °, the guide function can be exhibited, but the axial dimension of the taper portion 49a becomes longer, and not only the time required for press-fitting is increased, but also the total length of the hub 1 may be increased. On the other hand, if it exceeds 75 °, the guide function becomes insufficient, and there is a risk of misalignment.
  • the diameter D of the inner peripheral surface 37 of the fitting hole 22a, the maximum outer diameter D1 of the convex portion 35, and the minimum outer diameter D2 of the concave teeth 41b of the spline 41 are in the above relationship, and the hardness of the convex portion 35 Is 20 points or more larger than the hardness of the inner peripheral surface 37, and by pressing the shaft portion 12 into the hole 22 of the hub 1, the convex portion 35 bites into the inner peripheral surface 37 and the concave portion 36 extends along the axial direction. Will be formed. This is a kind of cutting by the spline 41.
  • a curled protrusion 45 is formed as shown in FIG.
  • the protruding portion 45 is accommodated in an accommodating portion 57 formed of an annular space formed on the outer periphery of the small diameter portion 12 b of the shaft portion 12.
  • the protruding portion 45 is a material having a capacity corresponding to the concave portion 36 formed by inserting the convex portion 35, and is extruded from the formed concave portion 36 or cut to form the concave portion 36. Or it is comprised from both what was extruded and what was cut. In this manner, the protruding portion 45 that is a part of the material scraped off or pushed out from the inner peripheral surface of the hole portion 22 enters the storage portion 57.
  • the protruding portion 45 can be held (maintained) in the storage portion 57, and the protruding portion 45 is a vehicle outside the apparatus. There is no intrusion. That is, the protruding portion 45 can be kept stored in the storage portion 57, and it is not necessary to perform the removal process of the protruding portion 45, the number of assembling operations can be reduced, and the assembling workability can be improved. Cost reduction can be achieved.
  • the hole 22 is reduced in diameter to return to the original diameter.
  • the hub 1 is elastically deformed in the radial direction when the convex portion 35 is press-fitted, and a preload corresponding to the elastic deformation is applied to the tooth surface of the convex portion 35 (surface of the concave portion fitting portion). For this reason, the concave / convex fitting structure M in which the entire concave portion fitting portion of the convex portion 35 is in close contact with the corresponding concave portion 36 can be reliably formed.
  • a female spline 42 that is in close contact with the male spline 41 is formed on the inner peripheral surface of the hole 22 of the hub 1 by the spline (male spline) 41 on the shaft portion 12 side.
  • a gap may be inevitably generated between the convex portion 35 and the concave portion 36 in the process of forming the concave portion by the convex portion 35.
  • the concave / convex fitting structure M is formed, and the axial position of the concave / convex fitting structure M is a position avoiding the position directly below the raceway surfaces 26, 27, 28, 29 of the rolling bearing 2, that is, This is a position that does not correspond to the radial direction with respect to the ball contact portion position of the raceway surfaces 26, 27, 28, and 29.
  • the bolt 54 is inserted into the through hole 56 of the hub 1 and screwed into the screw hole 50 of the shaft portion 12.
  • the bolt 54 includes a flanged head portion 54a and a screw shaft portion 54b.
  • the screw shaft portion 54b includes a large-diameter base portion 55a, a small-diameter main body portion 55b, and a tip-side screw portion 55c.
  • the base portion 55 a corresponds to the through hole 56 of the hub 1
  • the screw portion 55 c corresponds to the screw hole 50 of the shaft portion 12.
  • the inner diameter d1 of the through hole 56 is set slightly larger than the outer diameter d2 of the base portion 55a (see FIG. 6).
  • the dimensions are managed so that the diameter difference (d1-d2) is as small as possible. Therefore, in addition to keeping the processing tolerance small, a combination (matching) of the hub 1 and the bolt 54 may be adopted. As a specific example, it is about 0.05 mm ⁇ (d1-d2) ⁇ 0.5 mm.
  • the maximum outer diameter of the screw portion 55c is set to be the same as the outer diameter d2 of the base portion 55a or slightly smaller than the outer diameter of the base portion 55a.
  • the flange portion 60 of the head portion 54a of the bolt 54 comes into close contact with the seat surface 51 of the inner wall 22c of the hub 1, and the inner wall 22c is sandwiched between the end surface 52 of the shaft portion 12 and the head portion 54a of the bolt 54. Is done.
  • the mouth portion 11 of the outer joint member 5 is not brought into contact with the end portion (in this case, the caulking portion 31) of the hub 1, the caulking portion 31 of the hub 1 and the back face 11a of the mouth portion 11 are formed.
  • the gap 58 is preferably closed with a seal member 59.
  • the clearance 58 includes a portion extending in the radial direction between the caulking portion 31 of the hub 1 and the back face 11 a of the mouth portion 11, a hole portion 22 of the hub 1, and a shaft of the outer joint member 5.
  • the seal member 59 is disposed in the vicinity of the corner where the radial portion and the axial portion of the clearance 58 meet.
  • the material, shape and the like of the seal member 59 can be arbitrarily selected.
  • FIG. 5A shows an example of an O-ring
  • FIG. 5B shows an example of a band-shaped elastic material such as a gasket.
  • a sealing material may be interposed between the seat surface 60 a of the bolt 54 and the bottom surface of the counterbore 51 of the hub 1.
  • a sealing material (sealant) made of various resins that can be cured after application and can exhibit sealing properties between the seating surface 60a and the bottom surface of the spot facing 51 may be applied to the seating surface 60a of the bolt 54.
  • this sealing material it is desirable to select a material that does not deteriorate in the atmosphere in which the wheel bearing device is used.
  • the concave-convex fitting structure M in which the entire fitting contact portion 38 between the convex portion 35 of the outer joint member 5 and the concave portion 36 of the hub 1 is in close contact can be reliably formed. Moreover, since the member in which the recess 36 is formed does not need to be splined, not only can the processing cost be reduced, but also the work efficiency is improved because the phase alignment between the splines is not required for assembly. Damage to the tooth surface during press-fitting can be avoided, and a stable fitting state can be maintained.
  • the bolt fastening restricts the shaft 12 from coming off from the hub 1 in the axial direction, enabling stable torque transmission over a long period of time.
  • the axial positioning is performed and the dimensional accuracy of the wheel bearing device is stabilized.
  • the axial length of the concave-convex fitting structure M can be secured to a stable length, and the torque transmission can be improved.
  • the preload is applied to the rolling bearing 2 by crimping the end portion of the hub 1 and applying the end surface of the inner ring 24, it is not necessary to apply the mouth portion 11 of the outer joint member 5 to the inner ring 24. Accordingly, since it is not necessary to pay attention to the bearing preload when the shaft portion 12 of the outer joint member 5 is press-fitted, the efficiency of the work for assembling the hub 1 and the outer joint member 5 is improved. In addition, since the hub 1 and the mouse portion 11 are not in contact with each other, the problem of abnormal noise occurring at the contact portion between the hub 1 and the mouse portion 11 is solved.
  • the convex portion 35 bites into the concave portion forming surface during press-fitting, and the concave portion 36 is reliably formed. can do. That is, the press-fitting allowance with respect to the other side of the convex part 35 can be taken sufficiently. As a result, the formability of the concave-convex fitting structure M is stabilized, there is no variation in press-fit load, and a stable torsional strength is obtained.
  • the convex portion 35 of the concave-convex fitting structure M is provided on the shaft portion 12 of the outer joint member 5, and the hardness of the axial end portion of the convex portion 35 is set to the bore inner diameter portion of the hub 1. If the shaft portion 12 is press-fitted into the hole portion 22 of the hub 1, the hardness on the shaft portion side can be increased and the rigidity of the shaft portion can be improved.
  • the spline 41 formed on the shaft portion 12 can improve the moldability of the spline 41 and reduce the press-fit load by using small teeth with a module of 0.5 or less.
  • the convex part 35 can be comprised with the spline of the standard goods normally formed in this kind of shaft, this convex part 35 can be easily formed at low cost.
  • the pitch of the convex teeth 41a and the pitch of the concave teeth 41b are set to be the same. Therefore, as shown in FIG. 3B, the circumferential thickness L of the projecting direction intermediate portion of the convex portion 35 and the circumferential direction at a position corresponding to the intermediate portion between the convex portions 35 adjacent in the circumferential direction.
  • the dimension L0 is substantially the same.
  • the circumferential thickness L2 of the projecting direction intermediate portion of the convex portion 35 is a circumferential dimension at a position corresponding to the intermediate portion between the convex portions 35 adjacent in the circumferential direction. It may be smaller than L1. That is, in the spline 41 formed in the shaft portion 12, a portion that is a convex on the hub 1 side that fits between the convex portions 35 in the circumferential thickness (tooth thickness) L2 of the intermediate portion in the protruding direction of the convex portion 35. 43 is made smaller than the circumferential thickness (tooth thickness) L1 of the intermediate portion in the protruding direction.
  • the total tooth thickness ⁇ (B1 + B2 + B3 +%) of the convex portion 35 on the entire circumference on the shaft portion 12 side is replaced by the total tooth thickness ⁇ (A1 + A2 + A3 +) of the convex portion 43 (convex tooth) on the hub 1 side. ...) is set smaller than. Thereby, the shear area of the convex portion 43 on the hub 1 side can be increased, and the torsional strength can be ensured. And since the tooth thickness of the convex part 35 is small, a press-fit load can be made small and a press-fit property can be aimed at.
  • the circumferential thickness L2 of all the convex portions 35 is adjacent to the circumferential direction. It is not necessary to make it smaller than the dimension L1 in the circumferential direction between the matching convex portions 35. That is, among the plurality of convex portions 35, even if the circumferential thickness of the arbitrary convex portion 35 is the same as the circumferential dimension between the convex portions adjacent in the circumferential direction, it is larger than the circumferential dimension. However, it is sufficient if the sum is small.
  • the convex part 35 in FIG. 9 is made into the cross-sectional trapezoid (Mt. Fuji shape).
  • the end surface 52 of the small diameter portion 12b of the shaft portion 12 is brought into contact with the end surface 53 of the inner wall 22c.
  • the hub 1 and the outer joint member 5 are positioned in the axial direction. Therefore, a gap 58 is formed between the caulking portion 31 of the hub 1 and the back face 11a of the mouth portion 11.
  • the axial direction positioning of the hub 1 and the outer joint member 5 can be performed by bringing the caulking portion 31 of the hub 1 and the back surface 11a of the mouth portion 11 into contact with each other after press-fitting.
  • the contact surface pressure between the caulking portion 31 of the hub 1 and the back surface 11a of the mouse portion 11 is preferably 100 MPa or less. If the contact surface pressure exceeds 100 MPa, there is a difference in the amount of twist between the outer joint member 5 and the hub 1 at the time of a large torque load, and this difference may cause a sudden slip at the contact portion and generate noise. It is. By setting the contact surface pressure to 100 MPa or less, it is possible to provide a quiet wheel bearing device by preventing the generation of abnormal noise.
  • the hub 1 and the outer joint member 5 can be separated. That is, the fitting force of the concave-convex fitting structure M allows the outer joint member 5 to be pulled out from the hub 1 by applying a pulling force that is equal to or greater than a predetermined force.
  • the hub 1 and the constant velocity universal joint 3 can be separated using a jig 70 as shown in FIG.
  • the jig 70 includes a base 71, a pressing bolt member 73 inserted into a screw hole 72 penetrating the base 71, and a screw shaft 76 inserted into the screw hole 50 of the shaft portion 12.
  • the base 71 is provided with through holes 74 at the same pitch as the hub bolts 33 of the hub 1, and the base 71 can be attached to the hub 1 by tightening nuts 75 through the hub bolts 33 in the through holes 74.
  • the screw shaft 76 After attaching the base 71 to the hub 1 or before attaching the base 71, the screw shaft 76 is inserted into the screw hole 50 of the shaft portion 12, and the base portion 76a projects from the inner wall 22c of the hub 1 to the anti-joint side. .
  • the protruding amount of the base portion 76a is set longer than the axial dimension of the uneven fitting structure M.
  • the hub 1 and the outer joint member 5 once separated in this way can be assembled again. That is, as shown in FIG. 8, the shaft portion 12 of the outer joint member 5 is inserted into the hole portion 22 of the hub 1, and the male spline 41 of the shaft portion 12 and the female spline 42 of the hub 1 formed by the previous press-fitting. Match the phase with. Then, the bolt 54 is inserted from the through hole 56 of the hub 1 and screwed into the screw hole 50 of the shaft portion 12 of the outer joint member 5.
  • the base 55a of the bolt 54 is in a state corresponding to the through hole 56 as shown in FIG.
  • the inner diameter d1 of the through hole 56 is set to be slightly larger than the outer diameter d2 of the base portion 55a of the shaft portion 54b, and the diameter difference (d1-d2) is kept as small as possible.
  • the through hole 56 exhibits a guide function with respect to the bolt 54, and the shaft portion 12 of the outer joint member 5 can be press-fitted into the fitting hole 22a of the hub 1 without causing misalignment.
  • the axial dimension of the through-hole 56 if it is too short, a stable guide function cannot be exhibited. Conversely, if it is too long, the inner wall 22c becomes thick, and the axial length of the uneven fitting structure M is secured accordingly.
  • the hub 1 is heavy. Therefore, various changes can be made in consideration of these.
  • the hole 22 of the hub 1 has an inner diameter larger than the convex outer diameter D1 (see FIG. 6) of the shaft portion 12 of the outer joint member 5, and has unevenness in the circumferential direction. You may make it provide the formed large diameter part 22d.
  • the large diameter portion 22d is located on the opposite side of the inner wall 22c across the fitting hole 22a, in other words, on the press-fitting start side of the fitting hole 22a, and is used when the shaft portion 12 is re-pressed into the fitting hole 22a. Acts as a guide groove. That is, when reassembling after separation, it becomes easy to press-fit the convex portion into the concave portion formed last time, and the stability of reassembly can be improved without causing misalignment or inclination.
  • the press-fitting load is relatively large, and thus it is necessary to use equipment such as a press machine for press-fitting.
  • the press-fitting load is smaller than the first press-fitting, the press-fitting can be performed stably and accurately without using a press machine or the like. For this reason, it is possible to separate and reassemble the hub 1 and the outer joint member 5 even at a site where there is no such mechanical equipment.
  • the outer joint member 5 can be removed from the hole 22 of the hub 1 by applying an axial pulling force to the shaft portion 12 of the outer joint member 5, work for repair and inspection of each part is performed. (Maintenability) can be improved. Moreover, by fitting the shaft portion 12 of the outer joint member 5 into the hole portion 22 of the hub 1 again after the repair and inspection of each part, the entire fitting contact portion 38 between the convex portion 35 and the concave portion 36 is in close contact.
  • the combined structure M can be configured. For this reason, the wheel bearing device capable of stable torque transmission can be configured again.
  • the pressing bolt member 73 is screwed with the tip end of the screw shaft 76 reaching the bottom of the screw hole 50 and the base end portion of the screw shaft 76 protruding from the inner wall 22c to the outboard side.
  • the hub 1 and the outer joint member 5 are separated.
  • the tip of the screw shaft 76 reaches the bottom of the screw hole 50. If there is a gap, the female screw 72 and the screw hole 50 may have the same thread direction. This is because as the member 73 is screwed, the screw shaft 76 rotates together and no pressing force can be applied.
  • FIG. 11 shows an example in which a bolt 54 for fastening the hub 1 and the outer joint member 5 is used in place of the screw shaft 76.
  • the direction of the screw thread between the screw hole 50 of the shaft portion 12 and the female screw 72 of the base 71 is the reverse direction. That is, if the screw hole 50 is a right-hand screw (a screw that advances when turned clockwise), the female screw 72 is a left-hand screw (a screw that advances when the screw hole 50 rotates counterclockwise). Is a right-hand thread.
  • the bolt 54 screwed into the screw hole 50 of the shaft portion 12 is screwed out so that the head 54a of the bolt 54 is attached to the inner wall. Project from 22c to the outboard side.
  • the protruding amount of the bolt member 54 is set longer than the axial length of the concave-convex fitting structure M.
  • the pressing bolt member 73 is screwed into the screw hole 72 of the base 71 from the outboard side, and in this state, is screwed toward the screw shaft 76 side as indicated by an arrow.
  • the screw bolt 73 becomes a bolt by this screwing.
  • 54 is pressed in the direction of the arrow.
  • a separating force is generated on the bolt 54, the outer joint member 5 moves in the arrow direction with respect to the hub 1, and the outer joint member 5 is detached from the hub 1.
  • the bolt 54 does not rotate together, and a pressing force can be stably applied to the bolt 54. Therefore, it is possible to apply a pressing force to the bolt without bringing the tip of the bolt 54 into contact with the bottom surface of the screw hole 50, and the bolt 54 that couples the hub wheel 1 and the outer joint member 5 is used at the time of separation. It can be used as it is as a bolt, and the separation workability can be improved and the cost can be reduced.
  • the bolt 54 for fastening the hub wheel 1 and the outer joint member 5 may be different from the separating bolt.
  • the spline 41 constituting the convex portion 35 is formed on the shaft portion 12 side, the surface hardening treatment is applied to the spline 41 of the shaft portion 12, and the inner peripheral surface of the hub 1 is uncured (raw material). Yes.
  • spline 61 (convex teeth 61 a and concave teeth 61 b) subjected to surface hardening treatment is formed on the inner peripheral surface of the hole portion 22 of the hub 1, and the shaft portion 12 has a surface. You may not give a hardening process.
  • the spline 61 can also be formed by various processing methods such as broaching, cutting, pressing, and drawing.
  • various heat treatments such as induction hardening and carburizing and quenching can be employed.
  • the intermediate portion in the protruding direction of the convex portion 35 corresponds to the position of the concave portion forming surface (the outer peripheral surface of the shaft portion 12) before the concave portion is formed. That is, the diameter dimension (minimum diameter dimension of the convex portion 35) D4 connecting the vertices of the convex portions 35 that are the convex teeth 61a of the spline 61 is smaller than the outer diameter size D6 of the shaft portion 12, and the concave teeth of the spline 61
  • the diameter dimension of the circle connecting the bottoms of 61b (the inner diameter dimension of the inner peripheral surface of the fitting hole between the convex portions) D5 is set larger than the outer diameter dimension D6 of the shaft portion 12. That is, a relationship of D4 ⁇ D6 ⁇ D5 is established.
  • the convex portion 35 on the hub 1 side can form a concave portion 36 into which the convex portion 35 is fitted on the outer peripheral surface of the shaft portion 12. Thereby, the whole fitting contact part 38 of the convex part 35 and the recessed part fitted to this closely_contact
  • the fitting contact portion 38 is a range B shown in FIG. 10B, and is a range from the middle of the mountain shape to the top of the mountain in the cross section of the convex portion 35. Further, a gap 62 is formed on the outer diameter side of the outer peripheral surface of the shaft portion 12 between the adjacent convex portions 35 in the circumferential direction.
  • the protruding portion 45 is formed by press-fitting, it is preferable to provide a storage portion 57 for storing the protruding portion 45 (see FIG. 4). Since the protruding portion 45 is formed on the mouse side of the shaft portion 12, the storage portion is provided on the hub 1 side.
  • the convex portion 35 of the concave-convex fitting structure M is provided on the inner peripheral surface 37 of the hole portion 22 of the hub 1, and the hardness of the axial end portion of the convex portion 35 is set to the outside of the shaft portion 12 of the outer joint member 5.
  • surface hardening treatment heat treatment
  • FIG. 3 shows an example of a triangular shape
  • FIG. 9 shows an example of a trapezoid (Mt. Fuji shape). It can be arbitrarily selected from various shapes such as a shape and a rectangular shape, and the area, number, circumferential pitch, and the like of the convex portions 35 can be arbitrarily changed.
  • the convex portion 35 disposed along the axial direction can be press-fitted into the mating side, and the concave portion 36 can be formed on the mating side with the convex portion 35 so as to closely fit the convex portion 35. It is only necessary that the entire fitting contact portion 38 between the portion 35 and the concave portion fitted thereto is in close contact, and that rotational torque can be transmitted between the hub 1 and the constant velocity universal joint 3.
  • the hole portion 22 of the hub 1 may be a deformed hole such as a polygonal hole other than a circular hole, and the cross-sectional shape of the end of the shaft portion 12 fitted to the hole 22 is also a polygon other than a circular cross section. It may be an irregular cross section.
  • FIG. 3 shows an example in which the gap 40 is formed, but the gap 40 between the convex portions 35 may be bitten into the inner peripheral surface 37 of the hub 1.
  • the hardness difference between the convex portion 35 side and the concave portion forming surface side formed by the convex portion 35 is preferably 20 points or more in HRC, but 20 points if the convex portion 35 can be press-fitted. It may be less.
  • the end surface of the convex portion 35 is an example of a plane perpendicular to the axis (see FIG. 4), it may be an inclined surface having a predetermined angle with respect to the axis. In this case, it may be inclined from the inner diameter side toward the outer diameter side toward the anti-convex portion side or inclined toward the convex portion side.
  • FIG. 1 The small recess needs to be smaller than the volume of the recess 36.
  • the press-fit property of the protrusion 35 can be improved. That is, by providing the small concave portion, the capacity of the protruding portion 45 formed when the convex portion 35 is press-fitted can be reduced, and the press-fit resistance can be reduced.
  • the protrusion part 45 can be decreased, the volume of the storage part 57 can be reduced, and the workability of the storage part 57 and the strength of the shaft part 12 can be improved.
  • Various shapes such as a semi-elliptical shape and a rectangular shape can be adopted as the shape of the small concave portion, and the number can be arbitrarily set.
  • the first generation, the second generation, or the fourth generation may be used.
  • the side where the concave portion 36 is formed may be fixed and the side having the convex portion 35 may be moved, or conversely, the convex portion 35 is provided.
  • the side where the recess 36 is formed may be moved, or both may be moved.
  • the inner joint member 6 and the shaft 10 may be integrated via the concave / convex fitting structure M described here.
  • the seating surface of the bolt 54 is a sealing material interposed between the seating surface 60a of the bolt 54 that fixes the bolt between the hub 1 and the shaft portion 12 and the bottom surface of the counterbore 51 formed on the inner wall 22c.
  • the resin may be applied to the bottom surface of the spot facing 51.
  • a sealing material can be omitted. That is, by grinding the bottom surface of the counterbore 51, the adhesion of the bolt 54 to the seat surface 60a can be improved.
  • the sealing material can be omitted if the adhesion can be exhibited even in a so-called turning finish state without grinding the bottom surface of the spot facing 51.
  • FIG. 3 is an enlarged cross-sectional view of an uneven fitting structure in the wheel bearing device of FIG. 2. It is the X section enlarged view of Drawing 3 (a).
  • FIG. 3 is a partially enlarged view of FIG. 2. It is the elements on larger scale of the wheel bearing apparatus of FIG. 2 using an O-ring. It is the elements on larger scale of the wheel bearing apparatus of FIG. 2 which used the gasket.
  • FIG. 3 is an exploded longitudinal sectional view showing a state before press-fitting of the wheel bearing device of FIG. 2.

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  • Rolling Contact Bearings (AREA)

Abstract

L'invention porte sur un appareil de palier de roue solidaire d'un moyeu (1) pour monter une roue, de multiples paliers à roulement (2) et d'un joint homocinétique (3). Un arbre (12) d'un élément de joint externe (5) du joint homocinétique (3) est ajusté dans un trou (22) dans le moyeu (1), une saillie s'étendant axialement et disposée soit sur la surface périphérique interne du trou (22) dans le moyeu (1), soit sur la surface périphérique externe de l'arbre (12) de l'élément de joint externe (5), est pressée dans l'autre dans la direction axiale, une cavité qui est ajustée de manière serrée sur la saillie est formée sur l'autre à la saillie, et un mécanisme d'ajustement de saillie et de cavité (M) est configuré, la surface totale de l'emplacement de contact dans lequel la saillie et la cavité sont ajustées étant serrée. Le moyeu (1) et l'élément de joint externe (5) sont fixés de façon à être séparés ou ré-assemblés par l'introduction d'un boulon (54) à travers un trou traversant (56) formé dans une paroi interne (22c) du moyeu (1) et la coaxialité du trou traversant (56) par rapport au trou (22) dans le moyeu (1) est stipulée ne pas être supérieure à 1,0 mm.
PCT/JP2009/067027 2008-10-14 2009-09-30 Appareil de palier de roue WO2010044344A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2008-265173 2008-10-14
JP2008265173 2008-10-14
JP2008-284525 2008-11-05
JP2008284525A JP5349912B2 (ja) 2008-11-05 2008-11-05 車輪用軸受装置およびその分離方法

Publications (1)

Publication Number Publication Date
WO2010044344A1 true WO2010044344A1 (fr) 2010-04-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/067027 WO2010044344A1 (fr) 2008-10-14 2009-09-30 Appareil de palier de roue

Country Status (1)

Country Link
WO (1) WO2010044344A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8998731B2 (en) 2010-09-17 2015-04-07 Ntn Corporation Wheel bearing device
EP3029347A4 (fr) * 2013-07-31 2017-06-07 NTN Corporation Dispositif de palier pour roue

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007055322A (ja) * 2005-08-22 2007-03-08 Ntn Corp 車輪用軸受装置
JP2007069704A (ja) * 2005-09-06 2007-03-22 Ntn Corp 駆動車輪用軸受装置
JP2007296877A (ja) * 2006-04-27 2007-11-15 Ntn Corp 車輪用軸受装置
JP2007331556A (ja) * 2006-06-14 2007-12-27 Ntn Corp 駆動車輪用軸受ユニット
JP2008001243A (ja) * 2006-06-22 2008-01-10 Ntn Corp 駆動車輪用軸受ユニット
JP2008002579A (ja) * 2006-06-22 2008-01-10 Ntn Corp 駆動車輪用軸受ユニット
JP2008162359A (ja) * 2006-12-27 2008-07-17 Ntn Corp 車輪用軸受装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007055322A (ja) * 2005-08-22 2007-03-08 Ntn Corp 車輪用軸受装置
JP2007069704A (ja) * 2005-09-06 2007-03-22 Ntn Corp 駆動車輪用軸受装置
JP2007296877A (ja) * 2006-04-27 2007-11-15 Ntn Corp 車輪用軸受装置
JP2007331556A (ja) * 2006-06-14 2007-12-27 Ntn Corp 駆動車輪用軸受ユニット
JP2008001243A (ja) * 2006-06-22 2008-01-10 Ntn Corp 駆動車輪用軸受ユニット
JP2008002579A (ja) * 2006-06-22 2008-01-10 Ntn Corp 駆動車輪用軸受ユニット
JP2008162359A (ja) * 2006-12-27 2008-07-17 Ntn Corp 車輪用軸受装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8998731B2 (en) 2010-09-17 2015-04-07 Ntn Corporation Wheel bearing device
EP3029347A4 (fr) * 2013-07-31 2017-06-07 NTN Corporation Dispositif de palier pour roue

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