JP2011148409A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel ensuring sealing property, reducing the number of parts and machining steps and attaining cost reduction. <P>SOLUTION: Annular projection parts 17 are formed on a front surface side end part of inner rings 7, 8, a connection ring 9 is attached to the annular projection parts 17, and the inner rings 7, 8 are integrally bonded. The connection ring 9 includes a core metal 19 comprising a cylinder part 19a and a flange part 19b extending from both ends of the cylinder part 19a to an inner side in a radial direction and formed from a steel plate in an approximately U shape cross section by press working; and a seal member 20 made of a synthetic rubber integrally joined to a central part in an axial direction of the core metal 19 by vulcanization adhesion. Annular recession grooves 21 are formed on a portion near the annular projection parts 17, wall surfaces 17a at the recession groove 21 sides of the annular projection parts 17 are formed to substantially vertical surfaces and wall surfaces 17b at the end surface 7c sides of the inner rings 7, 8 are formed to a taper surface comprising a predetermined inclination angle α respectively, and the seal member 20 is elastically brought into contact with an outer periphery of an end part of the inner rings 7, 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, and more particularly to a full floating type wheel bearing device for supporting a driving wheel with a wheel bearing.

  Many automobiles having a frame-structured body such as a truck adopt a conventional full floating type as an axle structure of a drive wheel. Also, recent drive wheel support structures are often adopted as a structure in which double row rolling bearings are unitized for the purpose of improving assemblability and reducing weight and size. As an example of the conventional structure, a wheel bearing device as shown in FIG. 12 is known.

  In this wheel bearing device, a drive shaft 52 connected to a differential (not shown) is inserted into an axle tube 51, and a double row tapered roller bearing 53 is mounted on the outer diameter surface of the axle tube 51. . A hub wheel 54 rotatably supported by the double row tapered roller bearing 53 is connected to a flange 56 of the drive shaft 52 via a hub bolt 55. A pair of left and right inner rings 57 of the double-row tapered roller bearing 53 are coupled by a connecting ring 58, are fitted on the shaft portion of the axle tube 51, and are fastened and fixed by a fixing nut 59. The outer ring 60 of the double-row tapered roller bearing 53 is fitted into the hub ring 54 and is fixed in the axial direction with both ends thereof being sandwiched between the flange 56 and the brake rotor 61. In the annular space between the inner and outer rings 57 and 60, double-row tapered rollers 62 are rotatably accommodated by a cage 63, and seals 64 are mounted at both ends to seal the bearing interior.

  An annular step 65 is formed at the inner end of the inner ring 57, and a seal ring 66 made of an elastic member is attached. An annular recess 67 is formed on the outer peripheral surface of the butted portion of the pair of inner rings 57, 57, and a seal ring 68 made of an elastic member is attached to the annular recess 67. This prevents intrusion of muddy water from the outside into the axle tube 51 and leakage of the diff oil to the outside, and also prevents the infiltration of the diff oil into the bearing (see, for example, Patent Document 1).

JP 2001-99172 A

  In such a conventional wheel bearing device, an annular step 65 is formed at the inner end of the inner ring 57 in order to prevent muddy water from entering the axle tube 51 from outside and leakage of the differential oil to the outside. In addition, a seal ring 66 made of an elastic member is attached, and an annular recess 67 is formed on the outer peripheral surface of the abutting portion of the pair of inner rings 57 and 57 to prevent the differential oil from entering the bearing. A seal ring 68 made of an elastic member is attached. However, this increases the number of parts and increases the number of processing steps and assembly steps of the inner ring 57, increasing the cost.

  The present invention has been made in view of such conventional problems, and provides a wheel bearing device that secures sealing performance and reduces costs by reducing the number of parts and processing steps. Objective.

  In order to achieve such an object, the invention described in claim 1 of the present invention integrally has an axle tube through which a drive shaft connected to a differential is inserted, and a wheel mounting flange for mounting a wheel on the outer periphery, A wheel bearing device comprising: a hub wheel connected to the drive shaft; and a wheel bearing mounted between the hub wheel and a shaft portion of the axle tube and rotatably supporting the wheel. The wheel bearing is press-fitted into the inner diameter of the hub wheel, and an outer ring in which a double row outer rolling surface is integrally formed on the inner circumference, and an inner rolling that faces the outer rolling surface of the double row on the outer circumference. A wheel bearing device comprising a pair of inner rings on which running surfaces are formed and a double-row rolling element that is rotatably accommodated between the rolling surfaces of the inner ring and the outer ring, the front side of the inner ring An annular convex portion is formed at the end, and a connecting ring is attached to the annular convex portion to Are joined together, and the connecting ring is made of a cored bar formed by pressing from a steel plate, and a synthetic rubber seal integrally joined to the central part in the axial direction of the cored bar by vulcanization adhesion The seal member is elastically contacted with the end portion of the inner ring.

  As described above, in the full floating type wheel bearing device in which the driving wheel is supported by the wheel bearing, an annular convex portion is formed at the front side end portion of the inner ring, and a connecting ring is attached to the annular convex portion so that the inner ring is A cored bar formed by pressing a steel plate from a steel plate and a synthetic rubber seal member integrally joined to the central part in the axial direction of the cored bar by vulcanization adhesion. Since the seal member is elastically contacted with the end portion of the inner ring, the bearing for the wheel can be easily assembled while correcting the misalignment of the pair of inner rings, and the bearing from the butted surfaces of the pair of inner rings. It is possible to prevent the differential oil from entering the inside and reliably prevent the grease inside the bearing from leaking to the outside. Therefore, the sealing performance of the wheel bearing can be ensured, and the cost can be reduced by reducing the number of parts and the processing steps.

  Further, as in the invention described in claim 2, the cored bar is formed in a substantially U-shaped cross section including a cylindrical portion and a flange portion extending radially inward from both ends of the cylindrical portion, The seal member is joined to the inner periphery of the cylindrical portion of the core metal, an annular groove is formed in the vicinity of the annular protrusion, and the wall surface on the groove side of the annular protrusion is a substantially vertical surface. The wall surface on the end face side of the inner ring may be formed as a tapered surface having a predetermined inclination angle.

  Further, as in the invention described in claim 3, the inner diameter d1 of the flange portion of the core metal is larger than the outer diameter D1 of the concave groove of the inner ring and is larger than the outer diameter D2 of the annular convex portion. If the small diameter (D1 <d1 <D2) is set and the inner diameter d2 of the seal member is set to be smaller than the outer diameter D3 of the end of the inner ring (d2 <D3). A pair of inner rings can be easily coupled together by fitting the cored bar along the wall surface of the annular convex part and locking the collar part in the concave groove.

  Further, as in the invention according to claim 4, if the cored bar is formed in an end ring shape having a slit in one circumferential direction, the connecting ring is easily expanded in diameter and inserted. As a result, the assembly workability can be improved.

  Moreover, if the collar part of the said metal core is comprised by the several tongue piece folded back in the circumferential direction equality like invention of Claim 5, it will become easy to elastically deform a connection ring at the time of insertion. The insertability is further improved, and the assembling workability can be improved.

  If the inner diameter of the flange portion of the core bar is formed in a tapered shape that gradually increases in diameter toward the end surface as in the invention described in claim 6, the insertion performance of the connecting ring is improved, and assembly workability is improved. Can be improved.

  According to a seventh aspect of the present invention, the cored bar is formed in a cylindrical shape, and a plurality of U-shaped slits are formed in a circumferentially equidistant manner, and the tongue piece formed by the slits has a diameter. The seal member is joined to the inner periphery of the metal core, and an annular groove is formed in the vicinity of the annular protrusion, and the groove of the annular protrusion is bent. The wall surface on the side may be formed as a substantially vertical surface, and the wall surface on the end surface side of the inner ring may be formed as a tapered surface having a predetermined inclination angle.

  Further, as in the invention described in claim 8, the inner diameter d3 of the tongue piece of the metal core is larger than the outer diameter D1 of the concave groove of the inner ring and is larger than the outer diameter D2 of the annular convex portion. If the small diameter (D1 <d3 <D2) is set and the inner diameter d2 of the seal member is set smaller than the outer diameter D3 of the end of the inner ring (d2 <D3), the core piece tongue Can be fitted along the wall surface of the annular convex portion while being elastically deformed, and the tongue piece can be easily locked in the concave groove.

  Further, as in the ninth aspect of the invention, if the inclination angle of the wall surface of the annular convex portion is set in the range of 10 to 30 °, the wall surface becomes wider and the space of the inner ring is expanded. There is nothing, and the insertion property of the connecting ring is improved, and the assembling workability can be improved.

  Further, as in the invention described in claim 10, the cored bar has a substantially U-shaped cross section including a cylindrical portion and a flange portion extending radially outward from both ends of the cylindrical portion. Formed in an end ring having a slit extending in the axial direction at a location, the seal member is joined to the outer periphery of the cylindrical portion of the cored bar, and an annular concave groove is formed in the vicinity of the annular convex portion, The wall surface on the concave groove side of the annular convex portion may be formed in a substantially vertical surface.

  Further, as in the invention described in claim 11, the outer diameter D4 of the flange portion of the core metal is smaller than the inner diameter d4 of the concave groove of the inner ring and larger than the inner diameter d5 of the annular convex portion. If (d5 <D4 <d4) is set and the outer diameter D5 of the seal member is set to be larger than the inner diameter d5 of the annular convex portion (d5 <D5), the connecting ring is reduced in diameter. In this state, it is attached to the annular convex portion, and the collar portion can be easily locked in the concave groove.

  Further, as in the invention described in claim 12, the core metal is formed in a cylindrical shape, and a plurality of U-shaped slits are formed in a circumferentially equidistant manner, and the tongue piece formed by the slits has a diameter. The seal member is joined to the outer periphery of the metal core, and an annular groove is formed in the vicinity of the annular protrusion, and the groove side of the annular protrusion is The wall surface of the inner ring may be formed into a substantially vertical surface, and the wall surface on the end surface side of the inner ring may be formed into a tapered surface having a predetermined inclination angle.

  As in the invention described in claim 13, the outer diameter D6 of the tongue piece of the core metal is smaller than the inner diameter d6 of the concave groove of the inner ring and larger than the inner diameter d7 of the annular convex portion. If the outer diameter D7 of the seal member is set to be larger than the inner diameter d8 of the inner ring (d8 <D7), the core piece tongue piece is set (d7 <D6 <d6) Can be fitted along the wall surface of the annular convex portion while being elastically deformed, and the tongue piece can be easily locked in the concave groove.

  Further, as in the invention described in claim 14, if the surface of the core bar is subjected to a curing treatment in the range of 40 to 55 HRC by tempering or quenching, a desired strength can be ensured.

  According to a fifteenth aspect of the present invention, the wheel bearing comprises a double-row tapered roller bearing, the hub wheel is connected to a flange of the drive shaft via a hub bolt, and the wheel bearing If the outer ring is fixed in the axial direction while being sandwiched between the flange and the brake rotor, it is possible to reduce the weight and size.

  A wheel bearing device according to the present invention includes an axle tube through which a drive shaft connected to a differential is inserted, a wheel mounting flange for mounting a wheel on the outer periphery, and a hub wheel connected to the drive shaft. A wheel bearing device including a wheel bearing mounted between the hub wheel and a shaft portion of the axle tube and rotatably supporting the wheel, wherein the wheel bearing is the hub wheel. An outer ring in which a double row outer rolling surface is integrally formed on the inner periphery, and a pair of inner rings in which an inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery. In the wheel bearing device including a double row rolling element that is rotatably accommodated between both rolling surfaces of the inner ring and the outer ring, an annular convex portion is formed at the front side end of the inner ring, A connecting ring is attached to the annular convex portion so that the inner ring is integrally coupled, The connecting ring includes a cored bar formed by pressing from a steel plate, and a synthetic rubber sealing member integrally joined to the central part of the axial direction of the cored bar by vulcanization bonding. Is elastically contacted with the end of the inner ring, so that the bearing for the wheel can be easily assembled while correcting the misalignment of the pair of inner rings, and the differential oil enters the bearing from the butted surfaces of the pair of inner rings. It is possible to prevent the grease inside the bearing from leaking to the outside. Therefore, the sealing performance of the wheel bearing can be ensured, and the cost can be reduced by reducing the number of parts and the processing steps.

It is a longitudinal cross-sectional view which shows the wheel bearing apparatus with which the wheel bearing which concerns on this invention was mounted | worn. It is a longitudinal cross-sectional view which shows the wheel bearing of FIG. (A) is a longitudinal cross-sectional view which shows the connection ring which concerns on this invention, (b) is a principal part enlarged view of the inner ring | wheel of FIG. (A) is a longitudinal cross-sectional view which shows the modification of the connection ring of FIG. 3, (b) is a principal part enlarged view of (a). (A) is a front view which shows the other modification of the connection ring of FIG. 3, (b) is a front view which shows the other modification same as the above. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing which concerns on this invention. It is a longitudinal cross-sectional view which shows the connection ring of FIG. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing which concerns on this invention. (A) is a longitudinal cross-sectional view which shows the connection ring of FIG. 8, (b) is a front view of (a), (c) is a principal part enlarged view of the inner ring | wheel of FIG. It is a longitudinal cross-sectional view which shows 4th Embodiment of the wheel bearing which concerns on this invention. (A) is a longitudinal cross-sectional view which shows the connection ring of FIG. 10, (b) is a principal part enlarged view which shows the inner ring | wheel of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

  An axle tube through which a drive shaft connected to the differential is inserted, a wheel mounting flange for mounting a wheel on the outer periphery, and a hub wheel connected to the drive shaft, and the hub wheel and the shaft of the axle tube A wheel bearing device that is mounted between the hub wheel and a wheel bearing that rotatably supports the wheel, wherein the wheel bearing is press-fitted into an inner diameter of the hub wheel and is An outer ring formed integrally with the outer rolling surface of the row, a pair of inner rings formed with an inner rolling surface opposite to the outer rolling surface of the double row on the outer periphery, and both rolling of the inner ring and the outer ring In a wheel bearing device comprising a double row rolling element housed in a freely rolling manner between the faces, an annular convex part is formed at the front side end of the inner ring, and a connecting ring is attached to the annular convex part. The inner ring is integrally coupled, and the connecting ring is formed between the cylindrical portion and the circle. A cored bar formed by pressing from a steel plate into a substantially U-shaped cross section consisting of flanges extending inward in the radial direction from both ends of the part, and vulcanization bonding to the central part in the axial direction of the cored bar A synthetic rubber seal member joined to the annular convex portion, an annular concave groove is formed in the vicinity of the annular convex portion, a wall surface of the annular convex portion on the concave groove side is substantially vertical, and an end surface of the inner ring Side wall surfaces are respectively formed on tapered surfaces having a predetermined inclination angle, and the seal member is in elastic contact with the outer periphery of the end of the inner ring.

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 wheel bearing device equipped with a wheel bearing according to the present invention, FIG. 2 is a longitudinal sectional view showing the wheel bearing, and FIG. 3 (a) is according to the present invention. FIG. 4B is a longitudinal cross-sectional view showing a connection ring, FIG. 4A is a longitudinal cross-sectional view showing a modification of the connection ring in FIG. 3, and FIG. FIG. 5A is a front view showing another modified example of the connecting ring of FIG. 3, and FIG. 5B is a front view showing the other modified example. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  In this wheel bearing device, a drive shaft 2 connected to a differential (not shown) is inserted into an axle tube 1, and a wheel bearing 3 comprising a double row tapered roller bearing on the outer diameter surface of the axle tube 1. Is installed. A hub wheel 4 rotatably supported by the wheel bearing 3 is connected to a flange 6 of the drive shaft 2 via a hub bolt 5. A pair of inner rings 7 and 8 of the wheel bearing 3 are coupled by a connecting ring 9 described later, and are fitted onto the shaft portion of the axle tube 1 and are fastened and fixed by a fixing nut 10. An annular recess 13 is formed in the inner periphery of the inner ring 8 on the inner side of the pair of inner rings 7 and 8, and a seal ring 14 made of an elastic member is attached. Further, the outer ring 11 of the wheel bearing 3 is fitted in the hub ring 4 and fixed in the axial direction in a state where both ends thereof are sandwiched between the respective end surfaces of the flange 6 and the brake rotor 12 integrally formed with the drive shaft 2. Has been.

  As shown in an enlarged view in FIG. 2, the wheel bearing 3 includes an outer ring 11 formed with tapered double-row outer rolling surfaces 11 a, 11 a that are opened outward on the inner periphery, and an inner ring formed on the outer ring 11. A pair of inner rings 7, 8 having tapered inner rolling surfaces 7a, 7a formed on the outer periphery and facing the double-row outer rolling surfaces 11a, 11a on the outer periphery and accommodated between both rolling surfaces. Double-row rolling elements (conical rollers) 15 and 15 and a retainer 16 that holds the double-row rolling elements 15 and 15 so as to freely roll are provided. A large flange 7b for guiding the rolling element 15 is formed on the large diameter side (back side) of the inner rolling surface 7a of the pair of inner rings 7, 8. The pair of inner rings 7 and 8 are set in a state where the front side (small diameter side) end faces thereof are abutted with each other, thereby forming a so-called back-to-back type double row tapered roller bearing. Seals 18, 18 are attached to the opening of the annular space formed between the outer ring 11 and the pair of inner rings 7, 8, leakage of the lubricating grease enclosed in the bearing to the outside, rainwater and Dust and the like are prevented from entering the bearing.

  The outer ring 11, the inner rings 7, 8 and the rolling element 15 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core part by quenching. In addition, although the wheel bearing 3 which consists of the double row tapered roller bearing which used the rolling element 15 as the tapered roller was illustrated here, it is comprised not only in this but the double row angular ball bearing which uses the ball for the rolling element. Also good.

  Here, in the present embodiment, an annular convex portion 17 is formed on the outer periphery of the front end portion of the pair of inner rings 7, 8, and a connecting ring 9 is attached to the annular convex portion 17, and the pair of inner rings 7, 8 are joined together. This connecting ring 9 is a steel plate having rust prevention capability, such as an austenitic stainless steel plate (JIS standard SUS304 system), a ferritic stainless steel plate (JIS standard SUS430 system), or a tool steel or spring. A steel plate such as steel is formed by pressing, a cross section is formed of a ring having a substantially U-shape, and the surface is subjected to hardening treatment in the range of 40 to 55 HRC by tempering or quenching. Thereby, desired intensity | strength (shearing force) is securable.

  As shown in an enlarged view in FIG. 3 (a), the connecting ring 9 includes a cored bar 19 including a cylindrical part 19a and flanges 19b and 19b extending radially inward from both ends of the cylindrical part 19a. And a substantially cylindrical sealing member 20 integrally joined to the inner periphery of the cylindrical portion 19a of the cored bar 19 by vulcanization adhesion. The seal member 20 is made of synthetic rubber such as NBR (acrylonitrile-butadiene rubber), and has a protruding portion 20a formed at the center in the axial direction. As the material of the seal member 20, in addition to NBR, for example, HNBR (hydrogenated acrylonitrile butadiene rubber), EPDM (ethylene propylene rubber), etc. having excellent heat resistance, ACM having excellent heat resistance and chemical resistance, etc. (Polyacrylic rubber), FKM (fluoro rubber), silicon rubber, etc. can be illustrated.

  On the other hand, on the outer periphery of the front end portion of the inner rings 7, 8 to which the connecting ring 9 is attached, as shown in an enlarged view in FIG. 3B, an annular groove 21 and an end surface 7 c of the groove 21. An annular convex portion 17 is formed on the side. The wall surface 17a on the concave groove 21 side of the annular protrusion 17 is formed in a substantially vertical surface, and the wall surface 17b on the end surface 7c side is formed in a tapered surface having an inclination angle α of 10 to 30 °. In addition, when the inclination angle α exceeds 30 °, the insertion property of the connecting ring 9 described later is remarkably deteriorated, and when it is less than 10 °, the wall surface 17b becomes wider and the insertion stroke becomes longer, and the space for the inner rings 7 and 8 becomes larger. In addition to being enlarged, the insertion property of the connecting ring 9 is lowered, and the assembling workability is deteriorated.

  Here, the inner diameter d1 of the flange portion 19b of the core metal 19 is set to be larger than the outer diameter D1 of the concave groove 21 of the inner rings 7 and 8 and smaller than the outer diameter D2 of the annular convex portion 17 (D1 < d1 <D2) and the inner diameter d2 of the protruding portion 20a of the seal member 20 is set to be smaller than the outer diameter D3 of the end portions of the inner rings 7 and 8 (d2 <D3). Then, the cored bar 19 is fitted and inserted along the wall surface 17 b of the annular convex portion 17, and the flange portion 19 b is locked to the concave groove 21, whereby the pair of inner rings 7 and 8 are integrally coupled by the connecting ring 9. .

  While correcting the misalignment of the pair of inner rings 7, 8 with the connecting ring 9, the wheel bearing 3 can be easily assembled, and the protruding portion 20 a of the seal member 20 is elastic on the outer periphery of the end portions of the inner rings 7, 8. It adheres in a deformed state, and it is possible to prevent the differential oil from entering the bearing from the abutting surfaces of the pair of inner rings 7 and 8, and to reliably prevent the grease inside the bearing from leaking to the outside. Therefore, the sealing performance of the wheel bearing 3 can be ensured, and the cost can be reduced by reducing the number of parts and processing steps.

  FIG. 4 shows a modification of the connecting ring in FIG. The connecting ring 22 is added to a core bar 23 composed of a cylindrical part 19a and flanges 23a, 23a extending radially inward from both ends of the cylindrical part 19a, and an inner periphery of the cylindrical part 19a of the core bar 23. And a substantially cylindrical sealing member 20 joined together by sulfur bonding.

  Here, the inner diameter of the flange 23a of the cored bar 23 is formed in a tapered shape that gradually increases in diameter toward the end face. Thereby, the insertion property of the connection ring 22 improves and assembly workability | operativity can be improved.

  FIG. 5 shows another modification of the connecting ring of FIG. The connecting ring 24 shown in (a) includes a cored bar 25 composed of a cylindrical part 25a and flanges 25b, 25b extending radially inward from both ends of the cylindrical part 25a, and a cylindrical part 25a of the cored bar 25. And a sealing member 20 integrally joined to the inner periphery by vulcanization adhesion.

  Here, the cored bar 25 is formed in a ring shape having a slit 25c at one place in the circumferential direction. Thereby, the diameter of the connecting ring 24 can be easily expanded at the time of insertion, thereby improving the insertability and improving the assembly workability.

  The connecting ring 26 shown in (b) includes a cored bar 27 including a cylindrical part 19a and flanges 27a and 27a extending radially inward from both ends of the cylindrical part 19a, and a cylindrical part 19a of the cored bar 27. And a sealing member 20 integrally joined to the inner periphery by vulcanization adhesion.

  Here, the collar portion 27a of the cored bar 27 is composed of a plurality of tongue pieces folded back in the circumferential direction. As a result, the connecting ring 26 is easily elastically deformed at the time of insertion, and the insertability can be further improved to improve the assembly workability.

  6 is a longitudinal sectional view showing a second embodiment of the wheel bearing according to the present invention, and FIG. 7 is a longitudinal sectional view showing the connecting ring of FIG. This embodiment is basically different from the above-described embodiment only in the configuration of the connecting ring, and other parts and parts having the same parts or parts having the same functions as those of the above-described embodiments are denoted by the same reference numerals. The detailed explanation is omitted.

  A wheel bearing 3 shown in FIG. 6 is inserted into the outer ring 11 formed with tapered double-row outer rolling surfaces 11a, 11a that are opened outward on the inner periphery, and the outer ring 11 is inserted into the outer periphery. A pair of inner rings 7, 8 formed with tapered inner rolling surfaces 7a, 7a facing the double row outer rolling surfaces 11a, 11a, and a double row rolling element 15 accommodated between both rolling surfaces. , 15 and a cage 16 for holding the rolling elements 15, 15 in a double row so as to roll freely.

  Here, in the present embodiment, an annular convex portion 17 is formed on the outer periphery of the front end portion of the pair of inner rings 7, 8, and a connecting ring 28 is attached to the annular convex portion 17, and the pair of inner rings 7, 8 are joined together. The connecting ring 28 is a cylindrical shape formed by pressing a steel plate having a rust-proofing capability, for example, an austenitic stainless steel plate, a ferritic stainless steel plate, or a steel plate such as tool steel or spring steel. The surface is subjected to hardening treatment in the range of 40 to 55 HRC by tempering or quenching.

  As shown in an enlarged view in FIG. 7, the connecting ring 28 includes a core metal 29 and a seal member 30 having a substantially trapezoidal cross section integrally joined to the inner periphery of the core metal 29 by vulcanization adhesion. ing. The seal member 30 is made of synthetic rubber such as NBR. On the other hand, an annular concave groove 21 is formed at the front end portion of the inner rings 7 and 8 to which the connecting ring 28 is attached, and an annular convex portion 17 is formed on the end surface 7 c side of the concave groove 21.

  U-shaped slits 31 are formed at equal intervals in the circumferential direction of the cored bar 29, and a tongue 32 formed by the slits 31 is bent inward in the radial direction. Here, the inner diameter d3 of the tongue piece 32 of the core metal 29 is larger than the outer diameter D1 of the concave groove 21 of the inner rings 7 and 8 shown in FIG. The inner diameter d2 of the seal member 30 is set smaller than the outer diameter D3 of the end portions of the inner rings 7 and 8 (d2 <D3). Then, the tongue piece 32 of the core metal 29 is fitted while being elastically deformed along the wall surface 17 b of the annular convex portion 17, and the tongue piece 32 is engaged with the concave groove 21, whereby the pair of inner rings 7 are connected by the connecting ring 28. , 8 are joined together.

  While correcting the misalignment of the pair of inner rings 7 and 8 by the connecting ring 28, the wheel bearing 3 can be easily assembled, and the seal member 30 is elastically deformed to the outer periphery of the end portions of the inner rings 7 and 8. It is possible to prevent the differential oil from entering the bearing from the abutting surfaces of the pair of inner rings 7 and 8, and to reliably prevent the grease inside the bearing from leaking to the outside. Therefore, the sealing performance of the wheel bearing 3 can be ensured, and the cost can be reduced by reducing the number of parts and processing steps.

  8 is a longitudinal sectional view showing a third embodiment of the wheel bearing according to the present invention, FIG. 9A is a longitudinal sectional view showing the connecting ring of FIG. 8, and FIG. 8B is a sectional view of FIG. A front view and (c) are the principal part enlarged views of the inner ring | wheel of FIG. This third embodiment basically differs from the above-described embodiment only in the configuration of the inner ring and the connecting ring, and other parts and parts having the same parts or the same functions as the above-described embodiments have the same reference numerals. The detailed description is omitted.

  The wheel bearing 33 shown in FIG. 8 is inserted into the outer ring 11 and formed on the outer ring 11 on the outer ring 11 with the tapered double-row outer raceway surfaces 11a and 11a opened outwardly on the inner circumference. A pair of inner rings 34, 35 formed with tapered inner rolling surfaces 7a, 7a facing the double row outer rolling surfaces 11a, 11a, and a double row rolling element 15 accommodated between both rolling surfaces. , 15 and a cage 16 for holding the rolling elements 15, 15 in a double row so as to roll freely.

  Here, in the present embodiment, an annular convex portion 36 is formed on the inner periphery of the front end portion of the pair of inner rings 34, 35, and a connecting ring 37 is attached to the annular convex portion 36, and the pair of inner rings 34, 35 are coupled together. This connecting ring 37 is formed by pressing a rust-proof steel plate, such as an austenitic stainless steel plate, a ferritic stainless steel plate, or a steel plate such as tool steel or spring steel that has been rust-proofed. The ring is formed with a substantially U-shaped cross section, and the surface is subjected to hardening treatment in the range of 40 to 55 HRC by tempering or quenching.

  As shown in an enlarged view in FIG. 9A, the connecting ring 37 includes a cored bar 38 including a cylindrical part 38a and flanges 38b and 38b extending radially outward from both ends of the cylindrical part 38a. And a cylindrical sealing member 39 integrally joined to the outer periphery of the cored bar 38 by vulcanization adhesion. The cored bar 38 is formed with a slit 38c extending in the axial direction at one place in the circumferential direction to form an end ring.

  On the other hand, as shown in (c), an annular concave groove 40 and an annular convex portion on the side of the end surface 7c of the concave groove 40 are formed on the inner periphery of the end portion on the front side of the inner rings 34 and 35 to which the connecting ring 37 is attached. 36 is formed. A wall surface 36a on the groove 40 side of the annular protrusion 36 is formed in a substantially vertical surface.

  Here, the outer diameter D4 of the flange portion 38b of the metal core 38 is set to be smaller than the inner diameter d4 of the concave groove 40 of the inner rings 34 and 35 and larger than the inner diameter d5 of the annular convex portion 36 (d5 <D4). <D4) and the outer diameter D5 of the seal member 39 is set larger than the inner diameter d5 of the annular convex portion 36 (d5 <D5). Then, the pair of inner rings 34 and 35 are integrally coupled by attaching the ring 37 to the annular protrusion 36 with the connecting ring 37 being reduced in diameter and engaging the flange 38b with the groove 40.

  While correcting the misalignment of the pair of inner rings 34 and 35 by the connecting ring 37, the wheel bearing 33 can be easily assembled, and the seal member 39 is elastically deformed to the outer periphery of the end portions of the inner rings 34 and 35. It is possible to prevent the differential oil from entering the bearing from the butted surfaces of the pair of inner rings 34 and 35, and to reliably prevent the grease inside the bearing from leaking to the outside. Therefore, the sealing performance of the wheel bearing 33 can be secured, and the cost can be reduced by reducing the number of parts and the processing steps.

  10 is a longitudinal sectional view showing a fourth embodiment of the wheel bearing according to the present invention, FIG. 11 (a) is a longitudinal sectional view showing the connecting ring of FIG. 10, and FIG. 10 (b) is an inner ring of FIG. FIG. This fourth embodiment is basically the same as the second embodiment described above, except that the connecting ring is changed to an interpolation type, and other parts and parts having the same parts or the same functions as the above-described embodiments. Are denoted by the same reference numerals, and detailed description thereof is omitted.

  A wheel bearing 41 shown in FIG. 10 is inserted into the outer ring 11 formed with tapered double-row outer rolling surfaces 11a, 11a that are open outward on the inner periphery, and the outer ring 11 A pair of inner rings 42, 43 formed with tapered inner rolling surfaces 7a, 7a facing the double row outer rolling surfaces 11a, 11a, and a double row rolling element 15 accommodated between both rolling surfaces. , 15 and a cage 16 for holding the rolling elements 15, 15 in a double row so as to roll freely.

  Here, in the present embodiment, an annular convex portion 44 is formed on the inner periphery of the front end portion of the pair of inner rings 42 and 43, and a connecting ring 45 is attached to the annular convex portion 44, and the pair of inner rings 42, 43 is integrally connected. This connecting ring 45 is formed by pressing a steel plate having a rust-proofing capability, for example, an austenitic stainless steel plate, a ferritic stainless steel plate, or a steel plate such as a tool steel or spring steel subjected to rust prevention treatment. It consists of a formed cylindrical ring, and the surface is subjected to hardening treatment in the range of 40 to 55 HRC by tempering or quenching.

  11A, the connecting ring 45 includes a cored bar 46 and a seal member 47 having a substantially trapezoidal cross section integrally joined to the inner periphery of the cored bar 46 by vulcanization adhesion. And. The seal member 47 is made of synthetic rubber such as NBR. On the other hand, an annular concave groove 48 is formed at the front end portion of the inner rings 42 and 43 to which the connecting ring 45 is mounted, and an annular convex portion 44 is formed on the end surface 7 c side of the concave groove 48. The wall surface 44a on the concave groove 48 side of the annular protrusion 44 is formed in a substantially vertical surface, and the wall surface 44b on the end surface 7c side is formed in a tapered surface having an inclination angle α of 10 to 30 °.

  U-shaped slits 49 are formed at equal intervals in the circumferential direction of the cored bar 46, and the tongue piece 50 formed by the slits 49 is bent obliquely outward in the radial direction. Here, the outer diameter D6 of the tongue piece 50 of the core metal 46 is smaller than the inner diameter d6 of the concave groove 48 of the inner rings 42 and 43 shown in FIG. In addition to setting (d7 <D6 <d6), the outer diameter D7 of the seal member 47 is set to be larger than the inner diameters d8 of the end portions of the inner rings 42, 43 (d8 <D7). Then, the tongue piece 50 of the cored bar 46 is fitted and inserted while being elastically deformed along the wall surface 44 b of the annular protrusion 44, and the tongue piece 50 is engaged with the concave groove 48, whereby the pair of inner rings 42 are connected by the connecting ring 45. , 43 are joined together.

  While correcting the misalignment of the pair of inner rings 42 and 43 by the connecting ring 45, the wheel bearing 41 can be easily assembled and the seal member 47 is elastically deformed to the inner periphery of the end portions of the inner rings 42 and 43. It is possible to prevent the differential oil from entering the bearing from the butted surfaces of the pair of inner rings 42 and 43, and to reliably prevent the grease inside the bearing from leaking to the outside. Therefore, the sealing performance of the wheel bearing 41 can be ensured, and the cost can be reduced by reducing the number of parts and the processing steps.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The wheel bearing device according to the present invention can be applied to a full floating type wheel bearing device on the side of a driving wheel in which wheel bearings are mounted in openings of a driving shaft and an axle tube.

1 Axle tube 2 Drive shaft 3, 33, 41 Wheel bearing 4 Hub wheel 5 Hub bolt 6 Drive shaft flange 7, 34, 42 Outer side inner ring 7a Inner rolling surface 7b Large collar 7c Front side end surface 8, 35, 43 Inner ring 9, 22, 24, 26, 28, 37, 45 on the inner side Connection ring 10 Fixing nut 11 Outer ring 11 a Outer rolling surface 12 Brake rotor 13 Annular step 14 Seal ring 15 Rolling element 16 Cage 17, 36, 44 Annular convex portions 17a, 36a, 44a Wall surfaces 17b, 44b on the concave groove side of the annular convex portions Wall surfaces 18 on the end surface side of the annular convex portions Seals 19, 23, 25, 27, 29, 38, 46 Cores 19a, 25a, 38a Cylindrical portion 19b, 23a, 25b, 27a, 38b Saddle portion 20, 30, 39, 47 Seal member 20a Protruding portion 21, 40, 48 Recessed groove 25c, 31, 38c, 49 Slip 32, 50 Tongue piece 51 Axle tube 52 Drive shaft 53 Double row tapered roller bearing 54 Hub wheel 55 Hub bolt 56 Flange 57 Inner ring 58 Connecting ring 59 Fixing nut 60 Outer ring 61 Brake rotor 62 Conical roller 63 Cage 64 Seal 65 Annular stage Portions 66, 68 Seal ring 67 Annular recess d1 Inner diameter d2 Sealing member inner diameter d3 Tongue inner diameter d4, d6 Groove inner diameter d5, d7 Annular inner diameter d8 Inner ring end inner diameter D1 Recess Groove outer diameter D2 Ring convex outer diameter D3 Inner ring end outer diameter D4 Hump outer diameter D5, D7 Seal member outer diameter D6 Tongue outer diameter α Inclination angle of wall surface

Claims (15)

An axle tube through which a drive shaft connected to the differential is inserted;
A hub wheel integrally having a wheel mounting flange for mounting a wheel on the outer periphery, and connected to the drive shaft;
A wheel bearing device comprising a wheel bearing mounted between the hub wheel and a shaft portion of the axle tube and rotatably supporting the wheel,
An outer ring in which the wheel bearing is press-fitted into an inner diameter of the hub wheel, and an outer race surface of a double row is integrally formed on the inner periphery;
A pair of inner rings formed on the outer periphery with an inner rolling surface facing the double row outer rolling surface;
In a wheel bearing device comprising a double-row rolling element housed in a freely rolling manner between both rolling surfaces of the inner ring and the outer ring,
An annular convex portion is formed at the front side end portion of the inner ring, a connecting ring is attached to the annular convex portion, and the inner ring is integrally coupled,
The connecting ring includes a cored bar formed by pressing from a steel plate, and a synthetic rubber sealing member integrally joined to the central part in the axial direction of the cored bar by vulcanization bonding. Is in elastic contact with the end of the inner ring.   The cored bar is formed in a substantially U-shaped cross section including a cylindrical part and a flange part extending radially inward from both ends of the cylindrical part, and the sealing member is disposed on the inner periphery of the cylindrical part of the cored bar. In addition to being joined, an annular groove is formed in the vicinity of the annular convex portion, the wall surface on the concave groove side of the annular convex portion is a substantially vertical surface, and the wall surface on the end surface side of the inner ring is from a predetermined inclination angle. The wheel bearing device according to claim 1, wherein the wheel bearing device is formed on each tapered surface.   The inner diameter d1 of the flange portion of the metal core is set to be larger than the outer diameter D1 of the concave groove of the inner ring and smaller than the outer diameter D2 of the annular convex portion (D1 <d1 <D2). The wheel bearing device according to claim 2, wherein an inner diameter d2 of the seal member is set to a smaller diameter (d2 <D3) than an end outer diameter D3 of the inner ring.   The wheel bearing device according to any one of claims 1 to 3, wherein the cored bar is formed in an end ring shape having a slit in one circumferential direction.   4. The wheel bearing device according to claim 2, wherein the flange portion of the cored bar is composed of a plurality of tongue pieces that are folded back at equal intervals in the circumferential direction. 5.   The wheel bearing device according to any one of claims 2 to 5, wherein an inner diameter of the flange portion of the cored bar is formed in a tapered shape that gradually increases in diameter toward the end face side.   The cored bar is formed in a cylindrical shape, and a plurality of U-shaped slits are formed in a circumferentially equidistant manner, and a tongue piece formed by the slits is bent inward in the radial direction, and the core The seal member is joined to the inner periphery of the gold, an annular groove is formed in the vicinity of the annular protrusion, the wall surface on the groove side of the annular protrusion is a substantially vertical surface, and the end surface of the inner ring The wheel bearing device according to claim 1, wherein the side wall surfaces are respectively formed on tapered surfaces having a predetermined inclination angle.   An inner diameter d3 of the tongue piece of the metal core is set to be larger than an outer diameter D1 of the concave groove of the inner ring and smaller than an outer diameter D2 of the annular convex portion (D1 <d3 <D2). The wheel bearing device according to claim 7, wherein an inner diameter d2 of the seal member is set to a smaller diameter (d2 <D3) than an end outer diameter D3 of the inner ring.   The wheel bearing device according to any one of claims 1 to 8, wherein an inclination angle of a wall surface of the annular convex portion is set in a range of 10 to 30 °.   The cored bar has a substantially U-shaped cross section consisting of a cylindrical portion and a flange portion extending radially outward from both ends of the cylindrical portion, and has an end ring having a slit extending in the axial direction at one place in the circumferential direction. The sealing member is joined to the outer periphery of the cylindrical portion of the core metal, and an annular groove is formed in the vicinity of the annular convex portion, and the wall surface of the annular convex portion on the concave groove side is substantially vertical. The wheel bearing device according to claim 1, wherein the wheel bearing device is formed on a surface.   The outer diameter D4 of the flange portion of the metal core is set to be smaller than the inner diameter d4 of the concave groove of the inner ring and larger than the inner diameter d5 of the annular convex portion (d5 <D4 <d4), The wheel bearing device according to claim 10, wherein an outer diameter D5 of the seal member is set to a larger diameter (d5 <D5) than an inner diameter d5 of the annular convex portion.   The cored bar is formed in a cylindrical shape, a plurality of U-shaped slits are formed in a circumferentially equidistant manner, and a tongue piece formed by the slits is bent in a radially outward direction, and the core The seal member is joined to the outer periphery of the gold, an annular groove is formed in the vicinity of the annular protrusion, the wall surface of the annular protrusion on the groove side is a substantially vertical surface, and the end surface side of the inner ring The wheel bearing device according to claim 1, wherein each of the wall surfaces is formed on a tapered surface having a predetermined inclination angle.   The outer diameter D6 of the tongue piece of the metal core is set to be smaller than the inner diameter d6 of the concave groove of the inner ring and larger than the inner diameter d7 of the annular convex portion (d7 <D6 <d6), The wheel bearing device according to claim 12, wherein an outer diameter D7 of the seal member is set to be larger than an inner diameter d8 of the inner ring (d8 <D7).   The wheel bearing device according to any one of claims 1 to 13, wherein the surface of the core bar is subjected to hardening treatment in a range of 40 to 55 HRC by tempering or quenching.   The wheel bearing comprises a double-row tapered roller bearing, the hub wheel is connected to a flange of the drive shaft via a hub bolt, and an outer ring of the wheel bearing is sandwiched between the flange and a brake rotor. The wheel bearing device according to claim 1, wherein the wheel bearing device is fixed in an axial direction in a state.

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