WO2008056446A1

WO2008056446A1 - Bearing device for wheel

Info

Publication number: WO2008056446A1
Application number: PCT/JP2007/001215
Authority: WO
Inventors: Kazuhisa Shigeoka; Kazunari Yamamoto; Akira Torii
Original assignee: Ntn Corporation
Priority date: 2006-11-07
Filing date: 2007-11-06
Publication date: 2008-05-15

Abstract

[PROBLEMS] A bearing device for a wheel, in which entry of muddy water into a bearing is prevented and that has long life. [MEANS FOR SOLVING PROBLEMS] A double-row rolling bearing (2) is constructed from an outer ring (4) having, formed on its inner periphery, double-row outer rolling surfaces (4a, 4a), a pair of inner rings (5, 5) having, formed on its outer periphery, double-row inner rolling surfaces (5a, 5a) facing the outer rolling surface, and double-row rolling bodies (6, 6) rollably received between the outer and inner rolling surfaces. The outer ring (4) and inner rings (5) are constructed by press-forming from a stainless steel flat plate or a pipe material having antirust properties. Seals (13, 13) are attached to the openings of an annular space between circular tube sections (4c, 4c) of the outer ring (4) and second circular tube sections (5d, 5d) of the inner rings (5, 5).

Description

Specification

Wheel bearing device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a wheel bearing device that rotatably supports a wheel of a vehicle such as an automobile, and more particularly to a wheel bearing device that achieves light weight and compactness as well as cost reduction.

Background art

[0002] Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a double row rolling bearing, and is used for a driving wheel and a driven wheel. There is. For structural reasons, an inner ring rotation method is generally used for driving wheels, and both an inner ring rotation method and an outer member rotation method are generally used for driven wheels. This wheel bearing device has a structure called a first generation in which a wheel bearing consisting of a double-row anguillar ball bearing or the like is fitted between a knuckle and a hub ring constituting a suspension device, and an outer member. 2nd generation structure with body mounting flange or wheel mounting flange formed directly on the outer periphery of the wheel, 3rd generation structure with one inner rolling surface formed directly on the outer periphery of the hub wheel, or hub wheel It is roughly classified into the 4th generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the constant velocity universal joint.

Conventionally, an anguilla ball bearing having a structure in which an inner ring and an outer member (outer member) are formed from a steel plate by pressing is known. For example, an anguilla ball bearing 100 shown in FIG. 16 is used for a magnetic hard disk device or the like, but an outer member 10 0 1 and a pair of inner rings 1 0 2, 1 0 3 are stainless steel plates. Are formed by pressing or rolling.

[0004] The outer member 1 0 1 is formed with an annular convex portion 1 0 1 a projecting radially inward at a substantially middle portion of the inner circumferential surface, and the inner circumference on both sides of the annular convex portion 1 0 1 a Outer rolling surfaces 1 0 1 b and 1 0 1 c are formed on the surface. The outer member 10 1 1 has an outer peripheral surface fitted into a hole of the housing 10 4, and a flange formed at one end 1 0 1 d force << house 1 Axial positioning is performed by contacting the end face of the ring 104. Further, an annular recess 10 1 e is formed on the outer peripheral surface of the outer member 1 0 1 by the annular protrusion 1 0 1 a, and this annular recess 1 0 1 e is filled with an adhesive so that the housing 1 4 4 The outer member 1 0 1 is fixed in the hole.

[0005] —The inner and outer rings 102, 103 are fitted to the inner side of the double row outer rolling surfaces 1 0 1 b, 1 0 1 c of the outer member 1 0 1 from both sides in the axial direction. . Curved shoulders 102a and 103a are formed on the outer peripheries of the outer ends in the axial direction of the inner rings 102 and 103, and the inner raceway surface 102b is formed on the curved shoulders 102a and 103a. , 1 03 b is formed. And the double-row poles 106, 106 are these inner rolling surfaces 10 02 b, 103 b and the outer row 1 0 1 double-row outer rolling surfaces 1 0 1 b, 1 0 1 c And is held for each row by cages 1 07 and 1 07

[0006] On the inner peripheral surfaces of the inner rings 1002 and 103, a fitting portion that is fitted into the shaft member 105

1 02 c and 1 03 c are formed. After the inner rings 1002 and 103 are fitted to the shaft member 105 in the axial direction, a cylindrical weight 110 having a constant weight is placed on the curved shoulder 1102a of the inner ring 102, Due to the weight of this weight 109, the other inner ring 1 03 is pressed via the inner ring 1002, the pole 110, the outer member 1001, and the pole 106, and the curved shoulder 1 03a is the shaft member 1. It is fitted until it touches the flange 1 05 a of 05. As a result, an appropriate preload is set for the angular contact ball bearing 100.

[0007] When this gap fitting is completed, an adhesive 1 1 0 is filled in the gap between the curved shoulder 1 02a of one inner ring 1002 and the shaft member 1 05, and this adhesive 1 1 0 One inner ring 102 is prevented from being detached and the other inner ring 103 is prevented from being detached at the flange portion 105 a of the shaft member 105.

Patent Document 1: Japanese Utility Model Publication No. 6 _ 1 835

Disclosure of the invention

Problems to be solved by the invention

[0008] However, this kind of press-made anguilla ball bearing 100 is used as a wheel bearing. In order to ensure sealing performance, a sealing device (not shown) is installed in the opening of the annular space formed between the outer member 1 0 1 and the inner ring 1 0 2, 1 0 3 However, not only the number of parts increases, but also structural changes are required to secure the seal space, and the number of assembly steps increases along with the processing costs, so the cost cannot be denied.

[0009] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wheel bearing device that achieves light weight and compactness as well as cost reduction.

Means for solving the problem

[0010] In order to achieve such an object, the present invention provides a double row outer rolling surface on the inner peripheral surface, a substantially cylindrical outer ring having a press-fitting surface formed on the outer peripheral surface of the cylindrical portion, and the multiple outer peripheral surface. An inner rolling surface facing the outer rolling surface of the row, a cylindrical portion having an inner peripheral surface as a mating surface, and a pair of inner rings arranged in a butted state; A double row rolling element housed so as to be freely rollable between the surfaces, and at least the outer ring of the outer ring or the inner ring is formed by pressing or rolling from a plate material or a pipe material, and the outer ring A cylindrical portion extending outward in the axial direction from the outer rolling surface of the inner ring and the inner rolling surface of the inner ring, each being set to be thinner than the thickness of the outer rolling surface, and the inner circumferential surface of the cylindrical portion and the A seal is attached to the annular space formed by the outer peripheral surface of the cylindrical portion of the inner ring. Seal is press-fitted and fixed to the inner peripheral surface of the cylindrical portion of the outer ring, the surface hardening treatment and outer raceway surfaces on the inner rolling surface of the inner ring of the double row of the outer ring to adopt a configuration that has been subjected. ■ ■ ■ Claim 1

[001 1] In this way, a double-row outer rolling surface on the inner peripheral surface, a substantially cylindrical outer ring having a press-fit surface formed on the outer peripheral surface of the cylindrical portion, and an outer rolling of the double row on the outer periphery. An inner rolling surface facing the surface, and a cylindrical portion having an inner peripheral surface as a mating surface are formed, and a pair of inner rings arranged in a state where the cylindrical portions face each other, and freely rollable between the both rolling surfaces. A plurality of rolling elements housed in the outer ring or inner ring, and at least the outer ring is formed from a plate material or pipe material by pressing or rolling, and the outer raceway surface and inner ring of the outer ring are formed. Cylindrical parts extending axially outward from the inner rolling surface are formed The seal is attached to an annular space formed by the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the cylindrical portion of the inner ring. It is press-fitted and fixed to the inner peripheral surface of the cylindrical part of the outer ring, and the outer rolling surface of the outer ring of the outer ring and the inner rolling surface of the inner ring are surface-hardened, so the lubricating grease sealed inside the bearing It is possible to prevent leakage and intrusion of rainwater and dust into the bearing from the outside, and provide a long-life wheel bearing device. In addition, by providing cylindrical portions on the outer ring and the inner ring, a space for mounting the seal can be secured and sealing can be suitably performed. Furthermore, by adjusting the length of the cylindrical portion, the bearing device can be assembled without changing the design of the outer joint member of the conventional hub wheel or constant velocity universal joint, thereby reducing the cost of the device.

[0012] The present invention also includes: a hub ring fitted in the inner ring; and an outer joint member of a constant velocity universal joint fitted in the hub ring, fastened by screw means; Bearing preload can be applied by applying pressure from both sides to the pair of inner rings at the shoulder and the shoulder of the outer joint member. As a result, the preload can be applied at the same time as the assembly of the bearing device, so there is no need to provide a separate preload process, and costs can be reduced. In addition, since an appropriate preload can be applied, stable bearing performance can be maintained and the life of the bearing device can be extended. ■ ■ • Claim 2

[0013] Further, according to the present invention, since the outer member and the inner ring are pressed from a plate material or pipe material having a fender resistance, the outer member and the inner ring are crushed and the bearing performance is reduced. The life of the equipment is not shortened. ■ ■ ■ Claim 3

[0014] Further, in the present invention, since the rolling surfaces of the outer member and the inner ring have a hardened layer by quenching, friction is generated when the rolling elements roll on the rolling surface, and rolling occurs. It can reduce that the running surface is shaved or deformed. ■ ■ ■ Claim 4

[0015] In the present invention, the outer member is formed with a cylindrical portion extending outward in the axial direction, and a flange portion extending radially outward is formed at an axially outer end portion of the inner ring. Since seals are attached to the openings formed by the cylindrical part of the outer member and the flange part of the inner ring, leakage of the lubricating grease sealed inside the bearing and In addition, it is possible to prevent rainwater, dust, etc. from entering the inside of the bearing, and to provide a long-life wheel bearing device. Further, since the preload can be applied to the bearing at the shoulder portion of the hub wheel and the shoulder portion of the outer joint member, high bearing performance can be realized and a long-life wheel bearing device can be provided. ■ ■ ■ Claim 5

[001 6] Also, in the present invention, the seal includes a core metal press-fitted into an inner peripheral surface of the cylindrical portion of the outer member, and a seal member joined to the core metal and having a plurality of seal lips. The seal lip provided on the outer side seal of the seal is slidably contacted with the shoulder of the hub wheel, and the seal lip provided on the inner side seal is slidably contacted with the side surface of the flange. Can be done. Since the seal lip provided on the seal on the one side of the router is slidably contacted with the shoulder of the hub wheel, it is not necessary to prepare another slidable contact surface and the device can be made compact. ■ ■ ■ Claim 6

[001 7] In the present invention, the seal includes a core metal press-fitted into an inner peripheral surface of the cylindrical portion of the outer member, a seal member joined to the core metal, and having a plurality of seal lips. The seal lips provided on the seals on the outer side and the inner side of the seals may be in sliding contact with the side surfaces of the flanges. As a result, the outer side and inner side seals can be made of the same member, thereby realizing a reduction in cost. ■ ■ ■ Claim 7

[0018] In the present invention, the seal includes: a core metal press-fitted into an inner peripheral surface of the cylindrical portion of the outer member; and a seal member joined to the core metal and having a plurality of seal lips. In addition, a plate having a substantially L-shaped cross section is arranged over the outer diameter portion and a part of the side surface of the flange portion, and the seal lips provided on the seal on the outer side and the inner side of the seal are respectively It can also be in sliding contact with the side surface of the play bowl. As a result, a suitable sliding contact surface with less friction can be secured. ■ ■ ■ Claim 8

[001 9] Further, according to the present invention, since the plate is made of a stainless steel plate, the bearing performance is not deteriorated due to the crack, and the apparatus can have a long life. ■ ■ ■ Claim 9

[0020] In the present invention, the clearance between the inner peripheral surface of the cylindrical portion of the outer member or the inner peripheral surface of the core metal and the outer peripheral surface of the plate may be 1 mm or less. this Therefore, even if muddy water or foreign matter enters the inside of the seal lip, the clearance is narrow so that it does not enter further inside. ■ ■ ■ Claim 1 0

[0021] Further, in the present invention, since a step is provided between the inner raceway surface of the inner ring and the inner side surface of the flange portion, grinding or super machining of the inner raceway surface formed by pressing is performed. Sometimes, the rolling surface can be suitably machined without the tool interfering with the inner surface of the buttocks. This also makes it possible to process the rolling surface of the inner ring press-formed from pipe material using conventional equipment. In addition, since the outer member and the inner ring can be made of a press plate, light weight and cost reduction can be achieved. Further, since the preload can be applied to the bearing at the shoulder portion of the hub wheel and the shoulder portion of the outer joint member, high bearing performance can be realized and a long-life wheel bearing device can be provided. ■ ■ ■ Claim 1 1

[0022] Further, the present invention may be configured such that a step is provided on the outer side surface of the flange portion. Thereby, a collar part can be made uniform thickness and the intensity | strength can be ensured. ■ ■ ■ Claim 1 2

[0023] Further, in the present invention, chamfering or rounding may be applied to both ends of the inner raceway surface of the inner ring. As a result, the edge of each end of the inner rolling surface is rounded, and when the rolling element rolls on the inner rolling surface, the end of the inner rolling surface is caught or contacted with the end. Can prevent crawls. ■ ■ ■ Claim 1 3

[0024] Further, in the present invention, the chamfering or rounding may be performed during grinding or super processing of the inner raceway surface of the inner ring. This can improve the efficiency of the machining process. ■ ■ Claim 1 4

[0025] The present invention includes an outer member having a double row outer raceway formed on the inner periphery, and a wheel mounting flange integrally formed at one end, and a small diameter extending in the axial direction from the wheel mounting flange. A hub ring in which a step portion is formed, an inner member comprising at least one inner ring press-fitted into the small-diameter step portion of the hub ring via a predetermined scissors, and both the inner member and the outer member. A pair of rolling elements housed between the rolling surfaces, and a pair of seals mounted in an opening of an annular space formed between the inner member and the outer member And the outer member and the inner member are formed from a steel plate by plastic working, and at least one of the pair of seals is a member of the outer member or the inner member. It is integrally joined to either one of the members. ■ ■ ■ Claim 1 5

[0026] Thus, in the wheel bearing device of the first to third generation structure constituted by the hub wheel integrally having the wheel mounting flange at one end and the double row rolling bearing, the outer member and the inner member The member is formed from a steel plate by plastic working, and at least one of the pair of seals is integrally joined to either the outer member or the inner member, so that the number of parts can be reduced. Assembling man-hours can be greatly reduced, and costs can be reduced.

[0027] Preferably, as in the present invention, if the seal is made of an elastomer and is joined by vulcanization adhesion and slidably contacted with the other member facing, the desired sealability is ensured. Can do. ■ ■ ■ Claim 1 6

Further, as in the present invention, a shoulder portion extending radially outward is formed at one end portion of the inner ring, the seal is joined to the shoulder portion, and both end portions of the outer member are formed. A cylindrical portion may be formed, and the seal may be in sliding contact with the cylindrical portion. ■ ■ ■ Claim 1 7

[0029] Also, as in the present invention, shoulder portions extending radially inward are formed at both end portions of the outer member, the seal is joined to the shoulder portions, and a shaft is attached to one end portion of the inner ring. A cylindrical shoulder extending in the direction may be formed, and the seal may be in sliding contact with the shoulder. ■ ■ ■ Claim 1 8

[0030] Further, as in the present invention, one inner rolling surface facing the outer rolling surface of the double row is directly formed on the outer periphery of the hub wheel, and the inner rolling surface is connected to the shoulder portion via the shoulder. The inner diameter of the inner ring is formed on the outer periphery of the inner ring so as to be opposed to the outer rolling surface of the double row, and the end surface on the small diameter side is abutted against the shoulder. If combined, the strength and rigidity of the hub wheel can be increased, and the device can be made lighter and more compact. ■ ■ ■ Claim 1 9

The invention's effect [0031] The wheel bearing device according to the present invention includes a double-row outer rolling surface on the inner peripheral surface, a substantially cylindrical outer ring having a press-fit surface formed on the outer peripheral surface of the cylindrical portion, and the double-row on the outer periphery. An inner rolling surface opposed to the outer rolling surface of the inner cylindrical surface, a cylindrical portion having an inner peripheral surface as a fitting surface, and a pair of inner rings arranged in a state where the cylindrical portions face each other, between the two rolling surfaces A plurality of rolling elements movably accommodated in the inner ring, and at least the outer ring of the outer ring or the inner ring is formed by pressing or rolling from a plate material or a pipe material, and A cylindrical portion extending outward in the axial direction from the outer raceway surface of the outer ring and the inner raceway surface of the inner race is formed, and a press-fit surface is formed on the outer peripheral surface of the cylindrical portion of the outer race, and the outer raceway surface It is set to be thinner than the wall thickness of the cylinder, and is formed by the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the cylindrical portion of the inner ring. Seals are mounted in the annular space, and these seals are press-fitted and fixed to the inner peripheral surface of the cylindrical portion of the outer ring, and are arranged on the outer race surface of the double row of the outer ring and the inner race surface of the inner ring. Since the surface is hardened, it is possible to prevent leakage of lubricating grease sealed inside the bearing and to prevent rainwater and dust from entering the inside of the bearing from the outside, thereby providing a long-life wheel bearing device. be able to. Further, by providing cylindrical portions on the outer ring and the inner ring, a space for mounting the seal can be secured, and the seal can be suitably performed.

[0032] Further, the wheel bearing device according to the present invention has an outer member in which a double row outer rolling surface is formed on the inner periphery, and a wheel mounting flange at one end, and the wheel mounting flange. A hub ring having a small-diameter step portion extending in the axial direction from the inner ring, an inner member comprising at least one inner ring press-fitted into the small-diameter step portion of the hub ring through a predetermined shim opening, and the inner member A pair of rolling elements housed between both rolling surfaces of the outer member and a pair of seals attached to an opening of an annular space formed between the inner member and the outer member The outer member and the inner member are formed from a steel plate by plastic working, and at least one of the pair of seals is either the outer member or the inner member. Is joined to one of the members As a result, productivity is improved, yield is good, the number of parts can be reduced, the number of assembly steps can be greatly reduced, and cost can be reduced. BEST MODE FOR CARRYING OUT THE INVENTION

[0033] A double-row outer rolling surface on the inner circumferential surface, a substantially cylindrical outer ring having a press-fit surface formed on the outer circumferential surface of the cylindrical portion, and an inner side facing the outer rolling surface of the double row on the outer circumference A rolling surface and a cylindrical portion whose inner peripheral surface is a mating surface are formed, and the cylindrical portion is accommodated in a freely rolling manner between the pair of inner rings arranged in abutting state and the both rolling surfaces. A plurality of rolling elements, and at least an outer ring of the outer ring or the inner ring is formed by cold rolling from a pipe material, and an outer rolling surface of the outer ring and an inner rolling surface of the inner ring. A cylindrical portion extending axially outward from each other, set to be thinner than the wall thickness of the outer rolling surface, and formed by an inner peripheral surface of the cylindrical portion and an outer peripheral surface of the cylindrical portion of the inner ring A contact-type seal is mounted in the space, and these seals are press-fitted into the inner peripheral surface of the cylindrical portion of the outer ring. It is constant, curing by quenching layer is formed on the inner rolling run surface of the outer raceway surface inner ring of the double row of the outer ring. Example 1

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG. In the following description, the side closer to the outside of the vehicle in the state assembled to the vehicle is referred to as the outer side (left side of the drawing in FIG. 1), and the side closer to the center is referred to as the inner side (right side of the drawing in FIG. 1).

In the wheel bearing device according to the present invention, the hub wheel 1, the double row rolling bearing 2, and the constant velocity self-joint 3 are detachably unitized.

[0036] As shown in Fig. 2, the double row rolling bearing 2 includes an outer member (outer ring) 4 in which double row outer rolling surfaces 4a and 4a are formed on the inner periphery, and the outer periphery on the outer member 4a. A pair of inner races 5 and 5 formed with double row inner raceway surfaces 5 a and 5 a opposite to the outer raceway surface of the double row, and a double row of roll trains accommodated between both raceway surfaces. It consists of rolling elements (poles) 6 and 6. The outer member 4 and the inner ring 5 are made of a stainless steel flat plate or pipe material having a fender resistance and are formed by pressing.

[0037] The outer peripheral surface of the outer member 4 has a substantially cylindrical shape and is press-fitted and fixed to the knuckle 7. A protrusion 7 a is formed on the inner side in the radial direction of the knuckle 7. Protrusion The position of the outer member 4 is adjusted by the portion 7 a contacting the side surface of the outer member 4. The cross-sectional height of the protrusion 7 a is substantially equal to the height of the side surface of the outer member 4.

[0038] An annular convex portion 4b that protrudes radially inward is formed by pressing or rolling at a substantially central portion of the inner peripheral surface of the outer member 4. Double row outer rolling surfaces 4 a and 4 a having a substantially arc-shaped cross section are formed on the inner peripheral surfaces on both sides of the annular convex portion 4 b. Cylindrical portions 4 c and 4 c extending in the axial direction are formed on both sides of the outer rolling surfaces 4 a and 4 a. The wall thickness of the cylindrical parts 4c and 4c is thinner than the wall thickness of the outer rolling surfaces 4a and 4a. At least both outer rolling surfaces 4 a and 4 a of the outer member 4 are subjected to surface hardening treatment such as carburizing and quenching.

[0039] The inner rings 5, 5 are arranged so that the same shape is abutted symmetrically. There is no gap in the butt portion 5b. The inner rings 5, 5 are formed with first cylindrical portions 5c, 5c extending in the axial direction from the butted portions 5b. Inner rolling surfaces 5 a and 5 a having a substantially arc-shaped cross section are formed on the outer peripheral surfaces of the first cylindrical portions 5 c and 5 c, respectively. Second cylindrical portions 5d and 5d extending in the axial direction are formed on both sides of the inner rolling surfaces 5a and 5a. At least both inner rolling surfaces 5 a and 5 a of the inner rings 5 and 5 are subjected to surface hardening treatment such as carburizing and quenching.

[0040] Double row rolling elements 6, 6 are accommodated between the double row outer rolling surfaces 4a, 4a and the inner rolling surfaces 5a, 5a, respectively. The rolling elements 6 and 6 are held by the cages 8 and 8 so as to freely roll. In this example, a pole is used for the rolling element 6, but a double row tapered roller bearing using a tapered roller for the rolling element 6 may be used.

[0041] Seals are provided in the openings of the annular space formed between the cylindrical portions 4c and 4c of the outer member 4 and the second cylindrical portions 5d and 5d of the inner rings 5 and 5, respectively. 3 is installed. The seals 13 and 13 are composed of core bars 11 and 11 having a substantially U-shaped cross section, and seal members 12 and 12 joined to the core bars 11 and 11. The metal cores 11 and 11 are formed by pressing from a plate material or pipe material having a fender resistance. core The outer peripheral surfaces of the gold 11 and 11 are press-fitted and fixed to the inner peripheral surfaces of the cylindrical portions 4 c and 4 c of the outer member 4. Seal members 1 2 and 1 2 are joined to the cores 1 1 and 1 1 咅 ΙΠ 2 a, 1 2 a, 2 seal lips 1 2 b, 1 2 b and seal lip 1 2 c, 1 2 c and The ends of the seal lips 1 2 b and 1 2 b and the seal lips 1 2 c and 1 2 c are in sliding contact with the outer peripheral surfaces of the second cylindrical portions 5 d and 5 d of the inner rings 5 and 5. Seal lip 1 2 b, 1 2 b and seal lip 1 2 c, 1 2 c are elastic, and the metal cores 1 1 and 1 1 are shaped like a square. 1 3 and 1 3 are mounted in a state of suitable elastic deformation between the cylindrical portions 4 c and 4 c of the outer member 4 and the second cylindrical portions 5 d and 5 d of the inner rings 5 and 5. Therefore, it is possible to suitably prevent leakage of lubricating grease sealed in the bearing and rainwater dust from entering the bearing from the outside.

[0042] On the inner side of the hub wheel 1, a small-diameter step portion 1a having a cylindrical shape extending in the axial direction is formed. Inner rings 5 and 5 are fitted to the outer peripheral surface of the small-diameter step portion 1a. The outer peripheral surface of the small-diameter stepped portion 1a and the first cylindrical portions 5c, 5c of the inner rings 5, 5 are fitted with no gap.

A wheel mounting flange 1 b for mounting a wheel (not shown) is formed at the outer end of the hub wheel 1. In the circumferential direction of the wheel mounting flange 1b, a hub port through hole 1c is equally drilled. A hub port (not shown) that fixes the wheel is planted in the hub port pier 1c. On the inner periphery of the hub wheel 1, a torque transmission selection (or spline) 1d is formed. The shoulder 1 e of the hub wheel 1 is in contact with the side surface of the inner ring 5 on the outer side. The hub wheel 1 is made of medium carbon steel containing carbon 0.40 to 0.80 wt%, such as S 53 C, and has a surface hardness of 58 to 6 4 HRC range is hardened.

The constant velocity universal joint 3 includes an outer joint member 14, a joint inner ring 15, a cage 16 and a torque transmission pole 17. The outer joint member 14 includes a cup-shaped mouth portion 18, a shoulder portion 19 that forms the bottom of the mouth portion 18, a shaft portion 20 that extends in the axial direction from the shoulder portion 19, and a shaft And a male thread portion 2 1 extending in the direction. Curved track grooves 18 a and 15 a extending in the axial direction are formed on the inner periphery of the mouse portion 18 and the outer periphery of the joint inner ring 15, respectively. A torque transmission selection (or spline) 20 a is formed on the outer periphery of the shaft portion 20 of the outer joint member 14. The shoulder portion 19 of the outer joint member 14 is in contact with the side surface of the inner ring 5 on the inner side. The outer joint member 14 is made of medium carbon steel containing carbon 0.40 to 0.8 O wt%, such as S 5 3 C, and includes the track grooves 1 8 a and 15 a and the shoulder 1 9 The outer peripheral surface extending from the shaft portion 20 to the shaft portion 20 is hardened by induction hardening to a surface hardness range of 58 to 64 HRC.

The shaft portion 20 of the outer joint member 14 is fitted to the inner periphery of the hub wheel 1. Hub wheel

Torque is transmitted when the selection 20 1 of the shaft portion 20 of the outer joint member 14 is engaged with the selection 1 d of 1. The outer joint member 14 fitted inside the hub wheel 1 is fixed with a constant torque by the spindle nut 2 2 being screwed onto the male thread portion 21. At this time, the shoulder 1 e of the hub wheel 1 is in contact with the side of the inner ring 5 on the outer side, and the shoulder 19 of the outer joint member 14 is in contact with the side of the inner ring 5 on the inner side. When the nut 2 2 is tightened, the inner rings 5 and 5 are pressurized from both sides, and a preload is applied to the bearing 2.

Next, a method for manufacturing the outer member 4 and the inner ring 5 will be described.

FIGS. 3A and 3B are diagrams showing a method of manufacturing the outer member 4, where (a) shows a state before processing, and (b) shows a state during processing. 4A and 4B are diagrams showing a method for manufacturing the inner ring 5. FIG. 4A shows a state before processing, and FIG. 4B shows a state during processing.

[0047] In the center of Fig. 3 (a), a cross section of a pipe material 50 made of stainless steel having a barrier function as a base material of the outer member 4 is shown. This pipe material 50 is formed by cutting a long pipe material to a desired length, deburring both ends of the cut pipe material, and turning the inner diameter surface and the outer diameter surface. . A mandrel 51 that extends in the axial direction is fitted inside the pipe member 50 with a clearance from the inner peripheral surface of the pipe member 50. On the outer peripheral surface of the mandrel 51, molds such as convex portions 51a, 51b for forming the outer rolling surfaces 4a, 4a of the outer member 4 are formed. On the outside of the pipe material 50, molded to contact the outer peripheral surface of the pipe material 50 Roll 5 2 is placed. On the inner peripheral surface of the molding roll 52, a mold such as a convex portion 52a is formed to form an annular convex portion 4b protruding inward in the radial direction of the outer member 4.

As shown in FIG. 3 (b), when processing, the pipe material 50 is sandwiched between the forming roll 52 and the mandrel 51. Then, by rotating at least one of the forming roll 52 and the mandrel 51, a desired shape can be formed over the peripheral surface of the pipe 50. Finally, unnecessary parts at the end of the processed pipe material 50 are removed by machining. The outer member 4 is formed by such cold rolling.

[0049] In the center of Fig. 4 (a), a cross section of a pipe material 53 made of stainless steel having a fouling prevention function as a base material of the inner ring 5 is shown. The pipe material 53 is formed by cutting a long pipe material to a desired length, deburring both ends of the cut pipe material, and turning the inner surface and the outer surface. is there. An inner mold 5 4 extending in the axial direction is fitted inside the pipe material 53 with a clearance from the inner peripheral surface of the pipe material 53. A mold for forming the inner peripheral surface of the inner ring 5 is formed on the outer peripheral surface of the inner mold 54. On the outside of the pipe material 53, an outer die 55 that contacts the outer peripheral surface of the pipe material 53 is disposed. The outer mold 5 5 is formed with a mold such as a convex portion 5 5 a for forming the inner rolling surface 5 a of the inner ring 5.

[0050] As shown in FIG. 4 (b), when processing, the pipe material 5 3 is sandwiched between the inner mold 5 4 and the outer mold 55 and pressed, so that a desired width can be obtained over the peripheral surface of the pipe 53. The shape can be formed. Finally, unnecessary parts at the end of the processed pipe material 53 are removed by machining. The inner ring 5 is formed by such press working.

[0051] In this embodiment, an example is shown in which the outer member 4 and the inner ring 5 are processed using a pipe material as a base material. However, the present invention uses the outer member 4 and the inner ring 5 as flat plates, and the same processing is performed. Can be formed by a method. In this embodiment, the outer member 4 is formed by rolling and the inner ring 5 is press-molded. However, in the present invention, the outer member 4 is press-molded and the inner ring 5 is rolled. It can also be formed. Further, at least one of the outer member 4 and the inner ring 5 may be formed from a plate material or a pipe material by pressing or rolling, and the other can be processed by forging or the like.

Example 1

FIG. 5 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, and FIG. 6 is an enlarged view of a main part of FIG. It should be noted that the same parts, the same parts, or parts or parts having the same functions as those of the first embodiment described above are denoted by the same reference numerals and detailed description thereof is omitted.

In the wheel bearing device according to the present invention, the hub wheel 1, the double row rolling bearing 23 and the constant velocity universal joint 3 are detachably unitized.

[0054] As shown in Fig. 6, the double row rolling bearing 2 3 includes an outer member 4 having double row outer rolling surfaces 4a and 4a formed on the inner periphery, and the double row on the outer periphery. A pair of inner races 2 4 and 2 4 formed with double row inner raceway surfaces 5 a and 5 a facing the outer raceway surface of the double row, and a double row accommodated in a freely rolling manner between the two raceway surfaces It consists of rolling elements 6 and 6. The outer member 4 and the inner ring 24 are made of a flat plate or pipe material such as case-hardened steel, bearing steel, or stainless steel having a fender resistance, and are formed by pressing.

[0055] The inner rings 24, 24 are arranged so that the same shape is abutted symmetrically. There is no gap in the butt portion 5b. The inner rings 2 4 and 24 are formed with first cylindrical portions 5 c and 5 c extending in the axial direction from the butted portions 5 b. Inner rolling surfaces 5 a and 5 a having a substantially arc-shaped cross section are formed on the outer peripheral surfaces of the first cylindrical portions 5 c and 5 c, respectively. On both sides of the inner rolling surfaces 5a, 5a, flanges 5e, 5e extending outward in the radial direction are formed. At least both inner rolling surfaces 5 a and 5 a of the inner rings 24 and 24 are subjected to surface hardening treatment such as submerged or carburized and quenched.

[0056] The inner and outer openings formed between the cylindrical portions 4c, 4c of the outer member 4 and the flanges 5e, 5e of the inner rings 24, 24 are respectively Seals 2 5 and 2 6 are attached. Seals 2 5 and 2 6 are core bars with a substantially L-shaped cross section 2 7, 28, and seal members 29, 30 joined to the cores 27, 28. The core bars 2 7 and 2 8 are formed by pressing from a plate material or pipe material having a fender resistance. The outer peripheral surfaces of the core bars 2 7 and 2 8 are press-fitted and fixed to the inner peripheral surfaces of the cylindrical portions 4 c and 4 c of the outer member 4. The sealing members 29, 30 are joined portions 29a, 30a to be joined to the cores 27, 28, two sealing lips 29b, 30b and a sealing lip 29c, 3 0 c and The ends of the seal lip 29 b and the seal lip 29 c are in sliding contact with the side surface of the flange 5 e of the inner ring 24 on the inner side. The ends of the seal lip 30 b and the seal lip 30 c are in sliding contact with the shoulder 1 e of the hub wheel 1. This seal lip 29 b, 30 b and seal lip 29 c, 30 c prevent leakage of the lubricating grease sealed inside the bearing.

It is possible to suitably prevent rainwater and dust from entering the bearing from the outside.

[0057] On the inner side of the hub wheel 1, a small-diameter stepped portion 1a having a cylindrical shape extending in the axial direction is formed. Inner rings 24, 24 are fitted to the outer peripheral surface of the small diameter step 1a. The outer peripheral surface of the small-diameter stepped portion 1a and the first cylindrical portions 5c, 5c of the inner rings 24, 24 are fitted with no gap.

As shown in FIG. 5, the shaft portion 20 of the outer joint member 14 is fitted to the inner periphery of the hub wheel 1. Torque is transmitted when the selection 20 d of the shaft portion 20 of the outer joint member 14 meshes with the selection 1 d of the hub wheel 1. The outer joint member 14 fitted inside the hub wheel 1 is fixed at a constant torque by screwing the spindle nut 2 2 into the male thread portion 21 thereof. At this time, the shoulder 1 e of the hub wheel 1 abuts against the side surface of the flange 5 e of the inner ring 2 4 on the outer side, and the shoulder 1 9 of the outer joint member 1 4 is the flange of the inner ring 2 4 on the inner side. 5 Since it is in contact with the side of e, when the spindle nut 2 2 is tightened, pressure is applied to the inner rings 2 4 and 2 4 from both sides, and preload is applied to the bearing 2 3.

Example 3

[0059] Next, another embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 7 is a longitudinal sectional view showing an essential part of a third embodiment of the wheel bearing device according to the present invention. It should be noted that the same parts, the same parts, or the same functions as the above-described embodiment. Parts and parts having the same reference numerals are given the same reference numerals, and detailed description thereof is omitted.

[0060] In this example, the inner and outer openings formed between the cylindrical portions 4c, 4c of the outer member 4 and the flanges 5e, 5e of the inner rings 24, 24. Are fitted with seals 2 5 and 2 5, respectively. The ends of the seal lip 29 b and the seal lip 29 c are in sliding contact with the side surface of the flange 5 e of the inner ring 24. With this seal lip 29 b and seal lip 29 c, it is possible to suitably prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater and dust into the bearing from the outside.

Example 4

[0061] Next, another embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 8 is a longitudinal sectional view showing an essential part of a fourth embodiment of the wheel bearing device according to the present invention. Note that this embodiment basically differs from the third embodiment described above only in the seal sliding contact portion, and other parts or portions having the same parts or functions having the same functions as the above-described embodiments have the same reference numerals. The detailed explanation is omitted.

[0062] The inner side and outer side openings formed between the cylindrical portions 4c, 4c of the outer member 4 and the flanges 5e, 5e of the inner rings 24, 24 are respectively Seals 2 5 and 2 5 are attached. In this example, plates 3 1 and 3 1 having a substantially L-shaped cross section are placed over the outer diameter and part of the side surfaces of the flanges 5 e and 5 e of the inner rings 24 and 24 on the outer side and the inner side. Has been. The plate 31 includes a cylindrical portion 3 1 a extending in a cylindrical shape in the axial direction and a flange portion 3 1 b extending inward in the radial direction. The cylindrical portion 3 1 a is press-fitted and fixed to the outer diameter portion of the flange portion 5 e. The flange portion 3 1 b is in contact with the side surface of the flange portion 5 e. The plate 31 is formed by pressing a stainless steel plate. Further, the clearance between the inner peripheral surface of the cylindrical portion 4 c of the outer member 4 or the inner peripheral surface of the core metal 27 and the outer peripheral surface of the cylindrical portion 3 1 a of the plate 31 is 1 mm or less, more preferably 0 3 mm or more and 0.8 mm or less. Seal lips 29b and 29c are in sliding contact with the side surface of the flange portion 31b on the inner side. On the other hand, the seal lip 2 9 b and 2 9 c are in sliding contact.

Example 5

FIG. 9 is a longitudinal sectional view showing a fifth embodiment of the wheel bearing device according to the present invention, and FIG. 10 is an enlarged view of a main part of FIG. Also, in FIG. 10, only the right half of the bearing is shown, but the bearing part is symmetrical, so the description will be given for the entire bearing. This embodiment basically differs from the above-described third (FIG. 7) embodiment only in the configuration of the inner ring, except for the parts having the same parts and the same functions as the above-described embodiments. Parts are denoted by the same reference numerals, and detailed description thereof is omitted.

[0064] In the wheel bearing device according to the present invention, the hub wheel 1, the double row rolling bearing 3 2 and the constant velocity universal joint 3 are detachably unitized.

[0065] As shown in Fig. 10, the double row rolling bearing 3 2 includes an outer member 4 in which double row outer rolling surfaces 4a and 4a are formed on the inner periphery, and the double member on the outer periphery. A pair of inner races 3 3, 3 3 formed with double row inner rolling surfaces 5 a, 5 a facing the outer rolling surface of the row, It consists of rolling elements 6, 6 in a row. The outer member 4 and the inner ring 33 are made of a flat plate or pipe material such as case-hardened steel, bearing steel, or stainless steel having a fender resistance, and are formed by pressing.

[0066] The inner rings 3 3 and 3 3 are arranged so that the same shape is abutted symmetrically. There is no gap in the butt portion 5b. The inner rings 3 3 and 33 are formed with first cylindrical portions 5 c and 5 c extending in the axial direction from the butted portions 5 b. Inner rolling surfaces 5 a and 5 a having a substantially arc-shaped cross section are formed on the outer peripheral surfaces of the first cylindrical portions 5 c and 5 c, respectively. On both sides of the inner rolling surfaces 5a, 5a, flanges 5e, 5e extending outward in the radial direction are formed.

Here, a step Δ Α is provided between the inner rolling surfaces 5 a and 5 a of the inner rings 3 3 and 3 3 and the inner surfaces of the flange portions 5 e and 5 e. This step Δ ことに is to reduce the thickness of the inner ring 33 from the end of the inner rolling surface 5 a to the inner surface of the flange 5 e. Thus formed. Due to this level difference △ A, the inner rolling surface 5 is not interfered with the inner surface of the flange 5 e when the inner rolling surface 5 a formed by press working is ground or super-machined. a can be suitably processed.

[0068] Further, chamfering or rounding is performed on both ends of the inner rolling surfaces 5a, 5a of the inner rings 3 3, 3 3. As a result, the edges of the inner rolling surfaces 5 a and 5 a are rounded at the edges, and when the rolling elements 6 roll on the inner rolling surfaces 5 a and 5 a, the inner rolling surfaces 5 a , 5a can be prevented from getting hooked or touching the end. This chamfering or rounding process is applied when grinding or super machining the inner raceway surfaces 5a and 5a of the inner rings 3 3 and 3 3.

[0069] The inner side and outer side openings formed between the cylindrical portions 4c, 4c of the outer member 4 and the flanges 5e, 5e of the inner rings 3 3, 3 3 respectively Seals 2 5 and 2 5 are attached. The seal 25 includes a core bar 27 having a substantially L-shaped cross section, and a seal member 29 bonded to the core bar 27.

[0070] On the inner side of the hub wheel 1, a small-diameter step portion 1a having a cylindrical shape extending in the axial direction is formed. Inner rings 3 3 and 3 3 are fitted to the outer peripheral surface of the small-diameter step portion 1a. The outer peripheral surface of the small-diameter stepped portion 1a and the first cylindrical portions 5c and 5c of the inner rings 3 3 and 3 3 are fitted with no gap.

As shown in FIG. 9, the shaft portion 20 of the outer joint member 14 is fitted to the inner periphery of the hub wheel 1. Torque is transmitted when the selection 20 d of the shaft portion 20 of the outer joint member 14 meshes with the selection 1 d of the hub wheel 1. The outer joint member 14 fitted inside the hub wheel 1 is fixed at a constant torque by screwing the spindle nut 2 2 into the male thread portion 21 thereof. At this time, the shoulder 1 e of the hub wheel 1 abuts the side surface of the flange 5 e of the inner ring 3 3 on the outer side, and the shoulder 1 9 of the outer joint member 1 4 is the flange of the inner ring 3 3 on the inner side. 5 Since it is in contact with the side of e, when the spindle nut 2 2 is tightened, the inner rings 3 3 and 3 3 are pressurized from both sides, and a preload is applied to the bearing 3 2.

Example 6

Next, another embodiment of the present invention will be described in detail with reference to the drawings. FIG. 11 is a longitudinal sectional view showing an essential part of a sixth embodiment of the wheel bearing device according to the present invention. It should be noted that the same reference numerals are given to the same parts and parts that have the same parts or functions as those in the above-described embodiment, and detailed description thereof will be omitted.

[0073] In this example, not only a step Δ 段差 is provided between the inner rolling surfaces 5a, 5a of the inner rings 3 4, 3 4 and the inner side surfaces of the flanges 5e, 5e. A step Δ にも is also provided on the outer surface of the ridges 5 e and 5 e. The step Δ 、 is part of the heel 5 e

△ It is formed by being deformed to the right of the figure by A. That is, the collar portion 5 e has a uniform thickness. The step Δ Β is the shoulder of the outer joint member 1 4

1 A step is formed between the outer peripheral surface of 9 and the inner peripheral surface of the seal 25. As a result, the surface in contact with the shoulder portion 19 is not stepped, and the sliding contact surface of the seal 25 is not stepped.

Example 7

[0074] Fig. 12 is a longitudinal sectional view showing a seventh embodiment of the wheel bearing device according to the present invention, Fig. 13 (a) is a longitudinal sectional view showing a single outer member in Fig. 12. b) is a longitudinal sectional view showing the inner ring unit. It should be noted that the same parts and parts as those in the above-described embodiment or parts and parts having the same functions are denoted by the same reference numerals and detailed description thereof is omitted.

This wheel bearing device has a first generation structure, and includes a hub wheel 1 and a double-row rolling bearing 35 attached to the hub wheel 1. A constant velocity universal joint 3 is fitted into the hub wheel 1 so as to be able to transmit torque, and the hub wheel 1 and the constant velocity universal joint 3 are detachably integrated via a spindle nut 2 2.

[0076] The double-row rolling bearing 35 is fitted into the knuckle 7, and the outer member 3 6 having the double-row outer rolling surfaces 3 6a and 3 6a formed on the inner periphery, and these on the outer periphery. Double row outer raceway surfaces 3 6 a, 3 6 a Opposing inner raceway surfaces 3 7 a, 3 7 a formed with a pair of inner rings 3 7, 3 7 and cage between both raceway surfaces 8 and 8 are provided with double-row rolling elements 6 and 6 accommodated so as to be able to roll through 8 and 8. The end faces 3 7 b and 3 7 b on the small diameter (front) side of the inner rings 3 7 and 3 7 abut each other in a butted state to constitute a so-called back-to-back type double-row angular contact ball bearing. [0077] The outer member 3 6 and the inner ring 3 7 are formed by pressing or rolling a steel plate made of carburized steel such as SC r 4 20 or SCM 4 15 having a relatively small amount of carbon (hereinafter referred to as plastic working). ) Is formed by. The surface hardness is hardened by carburizing and quenching to a range of 50 to 64 HRC. Other examples of materials for the outer member 3 6 and the inner ring 3 7 include carbon steel such as SCM 4 40, cold rolled steel (JIS standard SPCC, etc.) and S 4 5 C. The In the case of cold-rolled steel or carbon steel, at least the outer member 3 6 has double row outer rolling surfaces 3 6 a, 3 6 a, and the inner ring 3 7 has inner rolling surfaces 3 7 a, 3 7 a However, it is hardened by induction hardening to a surface hardness in the range of 50 to 64 HRC, improving the rolling fatigue life. These rolling surfaces are ground and superfinished as necessary.

Next, the configuration of the outer member 36 and the inner ring 37 will be described in detail with reference to FIG.

The outer member 36 is formed into a cylindrical shape by punching a rolled steel plate into a disk-shaped material having a predetermined outer diameter, and this material is formed into a cup shape by deep drawing, and then punching out the bottom portion. The Then, as shown in (a), an annular convex portion 38 projecting radially inward is formed on the inner peripheral surface of the cylindrical material by plastic working. Further, double-row outer rolling surfaces 3 6 a and 3 6 a are formed by plastic working on both sides of the annular convex portion 38 and become seal land portions of seals 41 described later at both ends. Cylindrical portions 39, 39 are formed.

[0079] On the other hand, the inner ring 37, like the outer member 36, punches a rolled steel sheet into a disk-shaped material having a predetermined outer diameter, and this material is formed into a cup shape by deep drawing, and thereafter It is formed into a cylindrical shape by punching the bottom. Then, as shown in (b), the outer peripheral surface of this cylindrical material is subjected to plastic working, and the inner rolling surface 37a and the shoulder extending radially outward from the inner rolling surface 37a. Part 4 0 is formed.

[0080] The shoulder 4 0 of the inner ring 3 7 is in contact with the shoulder 1 e of the hub wheel 1 and the constant velocity universal joint 3, and the hub 1 is held between the shoulder 1 e and the constant velocity universal joint 3. Small diameter step of wheel 1 1 It is press-fitted and fixed to a. A predetermined bearing preload is applied by tightening the spindle nut 22 with a predetermined tightening torque.

Here, in this embodiment, the seal 41 is integrally joined to the shoulder 40 of the inner ring 37. That is, the seal 41 is made of an elastomer made of nitrile rubber or the like, has a pair of radial lips, and is integrally joined to the shoulder 40 by vulcanization adhesion. Then, as shown in Fig. 12, leakage of grease sealed inside the bearing in sliding contact with the cylindrical portion 39 of the outer member 36, and foreign matters such as rainwater and dust from the outside enter the bearing. Is preventing. As a result, the desired sealability can be ensured and the number of parts can be reduced, and the number of assembling steps can be greatly reduced, and the cost can be reduced.

In the present embodiment, the outer member 36 and the inner ring 37 are formed by plastic working and are manufactured substantially without machining, so that productivity is improved and yield is improved. Cost can be reduced. Here, the force illustrated as a double row rolling bearing 35 using a double row anguilla ball bearing using a pole as the rolling element 6 is not limited to this, and is a double row tapered roller bearing using a tapered roller as a rolling element. Also good.

Example 8

FIG. 14 is a longitudinal sectional view showing an eighth embodiment of the wheel bearing device according to the present invention. This embodiment is different from the above-described seventh embodiment only in part of the configuration of the hub wheel, and other detailed explanations are given by attaching the same reference numerals to the same parts or parts having the same functions or parts. Is omitted.

This wheel bearing device has a third generation structure, and includes an outer member 3 6, and an inner member 4 3 including a hub ring 4 2 and an inner ring 3 7 press-fitted to the hub ring 4 2. I have. A constant velocity universal joint 3 is fitted in the hub wheel 42 so as to be able to transmit torque, and the hub wheel 42 and the constant velocity universal joint 3 are integrated so as to be separable via a spindle nut 22.

[0085] The hub wheel 42 has a wheel mounting flange 1d at one end on the outer side, and an outer rolling surface on the outer side of the double row outer rolling surface 3 6a, 3 6a on the outer periphery. 3 to 6 a An opposing inner rolling surface 4 2 a and a cylindrical small diameter step portion 4 2 b extending in the axial direction from the inner rolling surface 4 2 a are formed, and a torque transmission selection (or Spline) 1 d is formed. This hub ring 42 is formed of medium and high carbon steel containing carbon 0.40 to 0.8 O wt% such as S 53 C, and is a flange that serves as a seal land portion of the seal 44 on the counter-side described later. From the base 4 2 c to the inner rolling surface 4 2 a and the small-diameter stepped portion 4 2 b, the surface hardness is hardened by induction hardening to a range of 58 to 64 HRC.

[0086] The inner ring 3 7 is press-fitted into the small-diameter stepped portion 4 2 b of the hub wheel 4 2, and the small-diameter side end surface 3 7 b collides with the shoulder portion 4 2 d of the hub ring 4 2 in abutting state and back-to-back This is a type of double-row anguilla ball bearing. The shoulder 40 of the inner ring 3 7 is in contact with the shoulder 4 2 d of the hub wheel 4 2 and the constant velocity universal joint 3, and is sandwiched between the shoulder 4 2 d and the constant velocity universal joint 3, A predetermined bearing preload is applied by tightening the spindle nut 22 with a predetermined tightening torque.

Here, in this embodiment, the seal 41 is integrally joined to the shoulder portion 40 of the inner ring 37, and the elastomer-made seal is attached to the outer cylindrical portion 39 of the outer member 36. 4 4 is installed. These seals 4 1 and 4 4 are used to prevent leakage of grease sealed inside the bearing in contact with the cylindrical portion 39 on the inner side of the outer member 3 6 and the flange base 4 2 c, and rainwater from the outside. Prevents foreign matter such as dust and dust from entering the bearing. As a result, the strength and rigidity of the hub wheel 42 can be increased, and the desired sealing performance can be secured and the device can be made lighter and more compact.

Example 9

FIG. 15 is a longitudinal sectional view showing a ninth embodiment of the wheel bearing device according to the invention. It should be noted that the same parts and parts as those in the above-described embodiment or parts and parts having the same functions are denoted by the same reference numerals and detailed description thereof is omitted.

This wheel bearing device has a first generation structure, and includes a hub wheel 1 and a double-row rolling bearing 45 attached to the hub wheel 1. The double row rolling bearing 4 5 has an outer member 4 6 formed on the inner periphery with double row outer rolling surfaces 3 6 a, 3 6 a, and an outer These double-row outer rolling surfaces 3 6 a, 3 6 a around the inner rolling surface 3 7 a,

3 7 A pair of inner rings 4 7, 4 7 formed with a and double row rolling elements 6, 6 accommodated between both rolling surfaces via cages 8, 8, respectively. Yes.

[0090] The outer member 46 and the inner ring 47 are formed by plastic working of steel plates made of carburized steel such as S Cr 4 20 and S C M 4 15 having a relatively small amount of carbon. The surface hardness is hardened by carburizing and quenching to a range of 50 to 64 HRC. These rolling surfaces are ground and superfinished as necessary.

[0091] The outer member 4 6 has double row outer rolling surfaces 3 6 a and 3 6 a formed on the inner peripheral surface, and the outer row rolling surfaces 3 6 a and 3 6 a of these double rows A shoulder 48 extending radially inward is formed on the outer end side by plastic working. Further, seals 49, 49 made of elastomer are integrally joined to these shoulder portions 48 by vulcanization adhesion. The shoulder portion 48 is formed with a stepped portion 48 a by machining and is positioned by engaging with the protruding portion 7 a of the knuckle 7.

[0092] — On the other hand, the inner ring 4 7, like the outer member 4 6, has an inner rolling surface 3 7 a and a second extending in the axial direction from the inner rolling surface 3 7 a by plastic working on the outer peripheral surface. The cylindrical portion 5d is formed. The second cylindrical portion 5d of the inner ring 47 is in contact with the shoulder 1e of the hub wheel 1 and the constant velocity universal joint 3, and is sandwiched between the shoulder 1e and the constant velocity universal joint 3. Is press-fitted and fixed to the small-diameter step 1 a of the hub wheel 1. Then, a predetermined bearing preload is applied by tightening the spindle nut 22 with a predetermined tightening torque.

[0093] Here, in the present embodiment, the seals 4 9,

4 9 are joined together, the seals 4 9 and 4 9 are in sliding contact with the second cylindrical portions 5 d and 5 d of the inner rings 4 7 and 4 7, and leakage of grease sealed inside the bearing This prevents foreign matter such as rainwater and dust from entering the bearing. As a result, the number of parts can be reduced and the number of assembly steps can be greatly reduced, resulting in a reduction in cost.

[0094] The embodiment of the present invention has been described above. The present invention is not limited to the embodiments, and is merely an example, and it is needless to say that the present invention can be implemented in various forms without departing from the scope of the present invention. It is indicated by the description of the scope of claims, and further includes the equivalent meanings of the scope of claims and all modifications within the scope.

Industrial applicability

The wheel bearing device according to the present invention is a first bearing that rotatably supports a wheel of an automobile or the like.

It can be applied to 1st to 3rd generation wheel bearing devices.

Brief Description of Drawings

FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention.

FIG. 2 is an enlarged view of the main part of FIG.

FIG. 3 is a view showing a manufacturing method of an outer member, where (a) shows a state before processing, and (b) shows a state during processing.

[Fig. 4] A diagram showing a manufacturing method of an inner ring, (a) shows a state before processing and (b) shows a state during processing.

FIG. 5 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention.

FIG. 6 is an enlarged view of the main part of FIG.

FIG. 7 is a longitudinal sectional view showing an essential part of a third embodiment of a wheel bearing device according to the present invention.

FIG. 8 is a longitudinal sectional view showing an essential part of a fourth embodiment of a wheel bearing device according to the present invention.

FIG. 9 is a longitudinal sectional view showing a fifth embodiment of the wheel bearing device according to the invention.

FIG. 10 is an enlarged view of the main part of FIG.

FIG. 11 is a longitudinal sectional view showing an essential part of a sixth embodiment of a wheel bearing device according to the present invention.

12 is a longitudinal sectional view showing a seventh embodiment of the wheel bearing device according to the present invention. [FIG. 13] (a) is a longitudinal sectional view showing a single outer member of FIG. (B) is FIG. 2 is a longitudinal sectional view showing a single inner ring.

FIG. 14 is a longitudinal sectional view showing an eighth embodiment of the wheel bearing device according to the present invention. FIG. 15 is a longitudinal sectional view showing a ninth embodiment of the wheel bearing device according to the present invention. FIG. 16 is a longitudinal sectional view showing a conventional anguilla ball bearing having a structure in which inner and outer rings are formed by press working.

Explanation of symbols

1, 42 Hub wheel

1 a, 42 b Small diameter step

1 b Wheel mounting flange

1 c Hubport pier

1d, 20a selection

1 e, 1 9, 40, 42 d, 48 Shoulder | 5

2, 23, 32, 35, 45 Double row rolling bearings

3 Constant velocity universal joint

4, 36, 46 Outer member

4 a, 36 a Outer rolling surface

4 b, 38 annular projection

4 c, 3 1 a, 39 Cylindrical 咅 P

5, 24, 33, 34, 37, 47 Inner ring

5 a, 37 a, 42 a Inner rolling surface

5 b Butt section

5 c First cylindrical part

5 d Second cylindrical part

5 e buttock

6 Rolling elements

7 Knuckles Protruding part 27, 28 Core

29, 30 Seal member a, 29 a, 30 a Joint P

b, 1 2 c, 29 b, 29 c, 30 b, 30 c-■ Seal lip. 25, 26, 4 1, 44, 49 Seal

Outer joint member Fitting inner ring a, 1 8 a Track groove

Kage

Torque transmission pole Mouse part Shaft part

Male thread Spindle nut Plate b Flange b Small diameter end face c Flange base Inner member

, 53 Pipe material

Mandrel a, 5 1 b Convex | 5

Forming roll a convex part

Inner type

Outer mold 55 a

1 00 1 0 1

1 0 1 a

1 0 1 b 1 0 1 d 1 0 1 e

1 02, 1

1 02 a,

1 02 b,

1 02 c,

1 04

1 05

1 05 a

1 06

1 07

1 09 1 1 0 △ A, △ B

Claims

The scope of the claims

[1] A double row outer rolling surface on the inner circumferential surface, a substantially cylindrical outer ring having a press-fitting surface formed on the outer circumferential surface of the cylindrical portion, and an inner side facing the outer rolling surface of the double row on the outer circumference A rolling surface and a cylindrical portion whose inner peripheral surface is a mating surface are formed, and the cylindrical portion is accommodated in a freely rolling manner between the pair of inner rings arranged in abutting state and the both rolling surfaces. A double row rolling element, and

Of the outer ring or the inner ring, at least the outer ring is formed by pressing or rolling from a plate material or pipe material,

Cylindrical portions extending outward in the axial direction from the outer raceway surface of the outer ring and the inner raceway surface of the inner race are formed, respectively, and set to be thinner than the wall thickness of the outer raceway surface, and the inner circumference of the cylinder portion A seal is mounted in an annular space formed by a surface and an outer peripheral surface of the cylindrical portion of the inner ring, and these seals are press-fitted and fixed to the inner peripheral surface of the cylindrical portion of the outer ring, A wheel bearing device, wherein the outer raceway surface and the inner raceway surface of the inner ring are subjected to surface hardening treatment.

[2] A hub ring fitted into the inner ring and an outer joint member of a constant velocity universal joint fitted to the hub ring are fastened by screw means, and the shoulder portion of the hub ring and the above-mentioned The wheel bearing device according to claim 1, wherein a bearing preload is applied by applying pressure from both sides to the pair of inner rings with a shoulder portion of the outer joint member.

[3] The wheel bearing device according to [1] or [2], wherein the outer member and the inner ring are pressed from a plate material or a pipe material having a fender resistance.

[4] The wheel bearing device according to any one of claims 1 to 3, wherein the rolling surfaces of the outer member and the inner ring have a hardened layer formed by quenching.

[5] A cylindrical portion extending in the axial direction outward is formed on the outer member, and a flange portion extending radially outward is formed at an axially outer end portion of the inner ring, and the cylindrical portion of the outer member The wheel bearing device according to any one of claims 1 to 4, wherein a seal is attached to each of openings formed by the flange portion of the inner ring.

[6] The seal includes a metal core press-fitted into an inner peripheral surface of the cylindrical portion of the outer member, and a seal member joined to the metal core and having a plurality of seal lips. The seal lip provided on the outer seal of the seal is in sliding contact with the shoulder of the hub wheel, and the seal lip provided on the inner seal is in contact with the side of the flange. The wheel bearing device according to claim 5.

[7] The seal includes a mandrel press-fitted into the inner peripheral surface of the cylindrical portion of the outer member, and a seal member joined to the mandrel and having a plurality of seal lips. 6. The wheel bearing device according to claim 5, wherein seal lips provided on the inner, outer and inner side seals are respectively slidably in contact with the side surface of the flange portion.

[8] The seal includes a metal core press-fitted into an inner peripheral surface of the cylindrical portion of the outer member, and a seal member joined to the metal core and having a plurality of seal lips. A plate having a substantially L-shaped cross section is arranged over the outer diameter portion and a part of the side surface. Seal lips provided on the outer side and inner side seals of the seals are respectively provided on the side surfaces of the plate rod. The wheel bearing device according to claim 5, wherein the wheel bearing device is in sliding contact.

9. The wheel bearing device according to claim 8, wherein the plate rod is made of a stainless steel plate.

10. The wheel bearing device according to claim 8, wherein a clearance between an inner peripheral surface of the cylindrical portion of the outer member or an inner peripheral surface of the cored bar and an outer peripheral surface of the plate is 1 mm or less. .

[1 1] The wheel bearing device according to any one of claims 5 to 7, wherein a step is provided between an inner rolling surface of the inner ring and an inner side surface of the flange portion.

12. The wheel bearing device according to claim 11, wherein a step is provided on an outer surface of the flange portion.

13. The wheel bearing device according to claim 11, wherein chamfering or rounding is performed on both ends of the inner raceway surface of the inner ring.

14. The wheel bearing device according to claim 13, wherein the chamfering or rounding is performed during grinding or super processing of the inner raceway surface of the inner ring.

[15] an outer member having a double row outer rolling surface formed on the inner periphery; -Hub wheel that has a wheel mounting flange at the end and has a small diameter step formed in the axial direction from this wheel mounting flange, and press fit into the small diameter step of this hub ring through a predetermined shimiro An inner member composed of at least one inner ring, a double row rolling element housed between both rolling surfaces of the inner member and the outer member, and between the inner member and the outer member. In a wheel bearing device comprising a pair of seals attached to an opening of an annular space to be formed,

The outer member and the inner member are formed from a steel plate by plastic working, and at least one of the pair of seals is integrally joined to either the outer member or the inner member. A bearing device for a wheel characterized by comprising:

16. The wheel bearing device according to claim 15, wherein the seal is made of an elastomer, and is slidably contacted with the other member that is joined by vulcanization adhesion and faces the other.

[17] A shoulder portion extending radially outward is formed at one end portion of the inner ring, the seal is joined to the shoulder portion, and cylindrical portions are formed at both end portions of the outer member. The wheel bearing device according to claim 15 or 16, wherein the seal is in sliding contact with a portion.

[18] A shoulder extending radially inward is formed at both ends of the outer member, the seal is joined to the shoulder, and a cylindrical shoulder extending in the axial direction at one end of the inner ring The wheel bearing device according to claim 15 or 16, wherein the seal is slidably contacted with the shoulder portion.

[19] One inner rolling surface opposite to the double row outer rolling surface is directly formed on the outer periphery of the hub wheel, and the small-diameter step portion is formed from the inner rolling surface through a shoulder. In addition, the inner ring is formed on the outer periphery with the other inner rolling surface facing the outer rolling surface of the double row, and the end surface on the small diameter side is abutted against the shoulder portion in a butted state. 1 to 18. The wheel bearing device according to any one of 1 to 8.