JP2017026061A - Wheel bearing device, processing method of wheel bearing device and assembling method of wheel bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel bearing device which is suppressed in the excess and shortage of a fastening margin between a side lip and a slinger of a sealing device, and excellent in sealing performance.SOLUTION: A wheel bearing device 1 has an outer ring member 10, an inner ring 30, a hub shaft 20 having a hub flange 22 at an end part of an external periphery at one side, rolling bodies 30, and a sealing device 50. The sealing device 50 has a slinger 60 and a seal member 51, the slinger 60 has a cylinder part 61 and a disc part 62, the seal part 51 has a side lip 58 which opposes the disc part 62, and an end part 59 of the side lip 58 slide-contacts with a side face 65 of the disc part 62 with a proper fastening margin Δ. The hub shaft 20 has an inner ring abutment face 26, and sets a difference between a first clearance L1 between an end face 34 of the inner ring 30 and a tip 59 of the side lip 58 at the disc part side, and a second clearance L2 between the inner ring abutment face 26 and the side face 65 of the disc part 62 to a value equal to the proper fastening margin Δ.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wheel bearing device used in a vehicle such as an automobile.

  In a wheel bearing device used in a vehicle such as an automobile, a lubricant such as grease is sealed in a bearing inner space between an outer ring member and an inner ring member. In addition, when muddy water or foreign matter enters the bearing internal space, the grease deteriorates or rust is generated on the component parts, thereby reducing the life of the bearing. For this reason, in the wheel bearing device, a sealing device is provided to prevent leakage of grease in the inner space of the bearing and to prevent entry of muddy water and foreign matter from the outside.

  As a sealing device for a wheel bearing device, a hub seal commonly known as a pack seal is known. A seal member having at least two seal lips, a side lip and a radial lip, is fixed to an end opening of the outer ring member, and a slender fitting surface of the inner ring member has an L-shaped cross section. A slinger having (See Patent Document 1)

  In the hub seal, the side lip is in sliding contact with the side surface of the slinger flat plate portion on the inner space side, and the radial lip is in sliding contact with the outer periphery of the cylindrical portion of the slinger. The seal member and the slinger simultaneously press the end portion of the seal member on the opposite side to the bearing inner space and the side surface of the slinger on the opposite side to the bearing inner space, so that the outer ring member and the inner ring member are It is attached to the opening of the bearing internal space between.

  Usually, in the hub seal, the interference between the side lip and the side surface on the inner space side of the flat plate portion of the slinger is the end of the seal member on the side opposite to the bearing inner space, and the slinger. When the side surface opposite to the bearing inner space is arranged on the same plane, it is set to be a proper interference.

As a wheel bearing device, a third generation unit type wheel bearing having a mounting flange to the vehicle body on the vehicle inner side of the outer ring member and a hub flange for wheel mounting on the vehicle outer side of the hub shaft which is the inner ring member. There is a device.
When the hub seal is installed in the opening on the vehicle outer side of the bearing inner space of the third generation unit type wheel bearing device, the seal member and the slinger are simultaneously pressed from the vehicle outer side. I can't do that. (See Patent Document 2)

JP 2005-291485 A JP 2007-127243 A

  In the hub seal mounted on the vehicle outer side of the third generation unit type wheel bearing device, the slinger is independently mounted on the hub shaft in advance separately from the seal member. However, it is difficult to fix the slinger at an accurate position in the axial direction on the hub axle. For this reason, in the hub seal, there is an excess or deficiency in the axial interference between the side lip and the slinger, and it may not be possible to obtain sufficient sealing performance as a sealing device for a wheel bearing device. .

  An object of the present invention is to provide a wheel bearing device excellent in sealing performance by suppressing an excess or deficiency of an axial interference between a side lip and a slinger of the sealing device.

  In order to solve the above problems, the structural features of the invention according to claim 1 are: an outer ring member having a pair of outer ring raceways formed on the inner periphery; an inner ring having a first inner ring raceway formed on the outer periphery; A second inner ring raceway having a hub flange extending radially outwardly at one end in the axial direction, and an inner ring that externally fits the inner ring at the other end in the axial direction. A hub shaft having a fitting surface, a plurality of rolling elements in two rows that roll between one outer ring raceway and the first inner ring raceway and between the other outer ring raceway and the second inner ring raceway, and the outer ring A sealing device for sealing an opening on the hub flange side of a bearing internal space between the member and the hub shaft, the sealing device comprising a metal slinger, a metal cored bar, and a synthetic rubber A seal member having a seal portion made of metal, and the slinger is the second inner ring of the hub axle. A cylindrical portion that is externally fitted to a shoulder outer peripheral surface between the road and the hub flange; and a disc portion that is radially expanded outward from an end portion on the hub flange side of the cylindrical portion, and the seal portion Has a side lip that faces the disk part and expands in the direction of the disk part, and an end of the side lip on the disk part side is predetermined on a side surface of the disk part on the seal part side. A bearing device for a wheel that is in sliding contact with an appropriate margin of the inner ring, wherein the hub shaft has an inner ring abutting surface that abuts the end surface of the inner ring on the hub flange side, and the end surface of the inner ring on the hub flange side And a difference between a first interval between the side lip and the distal end portion on the disk portion side, and a second interval between the inner ring abutting surface and the side surface on the seal portion side of the disk portion, It is set equal to a predetermined appropriate margin.

  The present invention relates to a wheel bearing device having a hub flange extending radially outward on one side in the axial direction, that is, on the outer side of the vehicle. According to the configuration of the present invention, the wheel bearing device is A sealing device for sealing the opening on the hub flange side of the bearing inner space, that is, the vehicle outer side, is provided. In the sealing device, the seal member has the side lip on the vehicle outer side, and is fixed to an end portion of the outer ring member on the vehicle outer side.

  In a state where the seal member is fixed to the end portion on the outer side of the vehicle, a first interval is defined between the end surface of the inner ring on the outer side of the vehicle and the disc portion side of the side lip, that is, the end portion on the outer side of the vehicle. An interval is set. In the sealing device, the slinger is fixed to an end portion of the hub shaft on the vehicle outer side. A second interval is set as an interval between the inner ring abutting surface of the hub shaft and the seal portion side of the disk portion of the slinger, that is, the side surface on the vehicle inner side.

  Further, according to the setting of the present invention, the difference between the first interval and the second interval is set equal to the predetermined appropriate interference. Here, the end surface of the inner ring on the hub flange side is in contact with the inner ring abutting surface of the hub shaft, and an end portion of the side lip on the outer side of the vehicle and a side surface of the disc portion on the inner side of the vehicle. The difference in axial position is equal to the difference between the first interval and the second interval.

  That is, there is little variation in the distance between the end portion on the vehicle outer side of the side lip and the side surface on the vehicle inner side of the disk portion due to the displacement of the position between the first interval and the second interval. By setting the difference between the first interval and the second interval to the predetermined appropriate margin, the end portion on the vehicle outer side of the side lip and the side surface on the vehicle inner side of the disc portion are The sliding contact is made in the axial direction with the predetermined appropriate interference.

  In order to solve the above-described problem, the structural feature of the invention according to claim 2 is that the hub axle has a slinger facing surface that serves as a reference for the axial position of the slinger on the slinger side of the hub flange. The third distance between the inner ring butting surface and the slinger facing surface is set to obtain the proper interference, and the slinger facing surface and the side surface on the seal portion side of the disk portion Is set equal to the sum of the fourth interval and the second interval.

  According to the configuration of the present invention, the hub shaft has a slinger facing surface that defines the axial position of the slinger on the slinger side, that is, the vehicle inner side, of the hub flange. The third distance between the inner ring abutting surface and the slinger facing surface is a second distance between the inner ring abutting surface of the hub axle and a vehicle inner side surface of the disk portion of the slinger. The slinger is set to be equal to the sum of the fourth distance between the slinger facing surface and the side surface of the disk portion on the vehicle inner side.

  The slinger is disposed on the hub axle so that the distance between the slinger facing surface and the side surface on the vehicle inner side of the disk portion is the fourth interval, whereby the inner ring abutting surface and the disk portion vehicle The distance from the inner side surface is equal to the second distance. That is, the end portion of the side lip on the vehicle outer side and the side surface of the disc portion on the vehicle inner side are in sliding contact with each other in the axial direction with the predetermined appropriate interference.

  In order to solve the above-mentioned problems, a feature of the invention according to claim 3 is the processing method of the wheel bearing device according to claim 2, wherein both the inner ring abutting surface and the slinger facing surface are set to 1 Grinding with a single grindstone at the same time.

  According to the configuration of the present invention, since both the inner ring abutting surface and the slinger facing surface are processed at the same time in a state where the hub shaft is attached to the main shaft of the processing machine, an error in attachment does not occur. Furthermore, in order to perform one grindstone processed simultaneously with one grindstone, a third distance between the inner ring butting surface and the slinger facing surface of the slinger facing surface after machining the inner ring butting surface Is maintained accurately, and variations in the third interval due to processing can be suppressed.

  In order to solve the above-described problem, a structural feature of the invention according to claim 4 is the method of assembling the wheel bearing device according to claim 1 or 2, wherein the seal pressing is performed to press the seal member. And a seal positioning surface abutting against an end surface of the inner ring on the hub flange side, that is, the vehicle outer side, and a fifth interval between the seal pressing surface and the seal positioning surface is the first interval. And a seal press-fitting jig equal to the sum of the sixth gap between the pressed surface of the seal member and the end of the side lip on the disk part side, which is set to obtain the proper interference margin And mounting the seal member on the outer ring member.

  The seal press-fitting jig in the assembling method of the present invention has a seal pressing surface that presses the seal member, and a seal positioning surface that contacts the end surface of the inner ring on the hub flange side, that is, the vehicle outer side. An interval between the seal pressing surface and the seal positioning surface is the fifth interval. The fifth interval is a sixth interval between the first interval and the pressed surface of the seal member and the end of the side lip on the disk portion side, which is set to obtain the proper interference. It is equal to the sum of the intervals.

  In the step of mounting the seal member on the outer ring member, the seal member is moved in the axial direction until the seal positioning surface of the seal press-fitting jig contacts the end surface of the inner ring on the vehicle outer side. The distance between the pressed surface of the inner ring and the end surface of the inner ring on the vehicle outer side is equal to the fifth distance. Here, the interval between the pressed surface of the seal member and the end of the side lip on the vehicle outer side is the sixth interval. That is, the distance between the outer surface of the inner ring on the outer side of the vehicle and the end of the side lip on the outer side of the vehicle is the sum of the fifth distance and the sixth distance, and is equal to the first distance.

  In this way, by mounting the outer ring member using the seal press-fitting jig, the interval between the end surface of the inner ring on the outer side of the vehicle and the end portion of the side lip on the outer side of the vehicle is accurately set to the first interval. It is maintained and variation can be suppressed. For this reason, it is possible to prevent excessive or insufficient axial interference between the end of the side lip on the outer side of the vehicle and the side surface of the disk portion of the slinger on the inner side of the vehicle.

  In order to solve the above-described problem, the structural feature of the invention according to claim 5 is the method of assembling the wheel bearing device according to claim 1 or 2, wherein the disk portion of the slinger is the assembly method. A slinger pressing surface that presses the side surface on the seal portion side, and a slinger positioning surface that abuts against the inner ring abutting surface of the hub shaft, and the distance between the slinger pressing surface and the slinger positioning surface is The slinger is mounted on the hub shaft using a slinger press-fitting jig equal to two intervals.

  In the assembling method of the present invention, the slinger press-fitting jig includes a slinger pressing surface that presses the seal portion side of the disk portion of the slinger, that is, a side surface on the vehicle inner side, and a slinger positioning that abuts the inner ring abutting surface of the hub shaft. And a surface. An interval between the slinger pressing surface and the slinger positioning surface is equal to the second interval, which is an interval between the inner ring abutting surface and the side surface of the disk portion on the vehicle inner side.

  In the step of attaching the slinger to the hub shaft, the slinger is moved in the axial direction until the slinger positioning surface of the slinger press-fit jig contacts the inner ring abutting surface of the hub shaft, and the press of the slinger is completed. To do. At this time, the distance between the side surface of the disk portion of the slinger on the inner side of the vehicle and the inner ring abutting surface is equal to the second distance.

  By mounting the slinger press-fitting jig to the hub shaft in this way, the distance between the end surface of the hub outer side of the hub shaft and the end of the side lip of the vehicle outer side is accurately the first distance. The dispersion can be suppressed. For this reason, it is possible to prevent excessive or insufficient axial interference between the end of the side lip on the outer side of the vehicle and the side surface of the disk portion of the slinger on the inner side of the vehicle.

  In order to solve the above-mentioned problem, the structural feature of the invention according to claim 6 is the method of assembling the wheel bearing device according to claim 2, wherein the axial width of the slinger is from the fourth interval. An annular slinger positioning jig equal to a value obtained by reducing the thickness of the disk portion and divided into a plurality of portions in the circumferential direction is disposed between the side surface on the hub flange side and the slinger facing surface of the hub flange. Then, the slinger is press-fitted into the hub shaft.

  A fourth interval is set as an interval between the outer side surface of the disk portion of the disk portion of the slinger and the slinger facing surface of the hub flange so that the interference in the axial direction is an appropriate interference. . In the assembling method of the present invention, in the step of attaching the slinger to the hub axle, the slinger positioning jig has an axial width equal to a value obtained by subtracting a plate thickness of the disk portion of the slinger from the fourth interval. Use a positioning jig.

  The slinger is configured such that the slinger positioning jig is disposed with one side surface of the positioning jig abutting against the slinger-facing surface of the hub flange, and the slinger is moved to the outer side of the vehicle. Is press-fitted into the outer peripheral surface of the shoulder. The installation of the slinger is completed when the slinger is moved to the outer side of the vehicle and the side surface of the disk portion of the slinger on the outer side of the vehicle comes into contact with the other side surface of the positioning jig in the axial direction.

The distance between the vehicle outer side surface of the disk portion of the slinger and the slinger-facing surface of the hub shaft is accurately maintained and thus does not vary by press-fitting the slinger into the hub shaft. . That is, the distance between the side surface of the disk portion on the vehicle inner side and the slinger facing surface of the hub shaft is also accurately maintained, and variations can be suppressed.
Therefore, in the step of attaching the slinger to the hub axle, an axial interference between the end of the side lip on the vehicle outer side and the side surface of the disk portion of the slinger on the inner side of the vehicle. It is possible to prevent occurrence of excess or deficiency.

  As described above, according to the configuration, the processing method, and the assembling method of the present invention, the axial interference between the side lip of the seal member and the side surface of the disk portion of the slinger on the inner side of the vehicle. Excess or deficiency can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the excess and deficiency of the axial interference between the side lip and slinger of a sealing device can be suppressed, and the wheel bearing apparatus excellent in sealing performance can be provided.

It is sectional drawing of the wheel bearing apparatus of 1st Embodiment of this invention. It is an expanded sectional view of the principal part of the bearing device for wheels of a 1st embodiment of the present invention. It is explanatory drawing explaining the assembly method of the sealing member of the wheel bearing apparatus of 1st Embodiment of this invention. It is explanatory drawing explaining the assembly method of the slinger of the wheel bearing apparatus of 1st Embodiment of this invention. It is sectional drawing of the wheel bearing apparatus of 2nd Embodiment of this invention. It is an expanded sectional view of the principal part of the bearing device for wheels of a 2nd embodiment of the present invention. It is explanatory drawing explaining the assembly method of the slinger of the wheel bearing apparatus of 2nd Embodiment of this invention.

1, 2, 5, and 6, the right side in the drawing indicates the vehicle outer side (hereinafter referred to as the outer side), and the left side indicates the vehicle inner side (hereinafter referred to as the inner side).
In FIG. 3, the upper side in the drawing shows the outer side, and the lower side shows the outer side.
4 and 7, the upper side in the drawing indicates the inner side, and the lower side indicates the outer side.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view in the axial direction of a wheel bearing device 1 according to a processing method for a wheel bearing device according to a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the main part of the wheel bearing device according to the first embodiment of the present invention shown in FIG.
1 and 2, the wheel bearing device 1 includes an outer ring member 10, a hub shaft 20, an inner ring 30, balls 40 as a plurality of rolling elements in two rows, and two cages 41. .

  The outer ring member 10 has a pair of outer ring raceways 11 and 12 formed on the inner periphery. The hub shaft 20 has a first inner ring raceway 21 formed on the outer periphery, and has a hub flange 22 at the outer end. The inner ring 30 has a second inner ring raceway 31 formed on the outer periphery. The balls 40 as a plurality of rolling elements in two rows are between one outer ring raceway 11 of the outer ring member 10 and the first inner ring raceway 21 of the hub shaft 20 and between the other outer ring raceway 22 and the inner ring 30 of the outer ring member 10. Roll between the second inner ring raceways 31. The two holders 41 hold the plurality of balls 40 in the two rows at a predetermined interval.

  A bearing internal space 2 is formed between the outer periphery of the hub shaft 20 and the outer periphery of the inner ring 30 and the inner periphery of the outer ring member 10, and the bearing internal space 2 is filled with grease as a lubricant. The bearing internal space 2 is sealed with a sealing device 50 disposed in the opening on the hub flange 22 side, that is, on the outer side, and a cap 80 fixed to an end portion on the inner side of the outer ring member 10.

  The outer ring member 10 is an annular body made of alloy steel such as S55C. The outer ring member 10 has a fixing flange 13 for expanding the diameter radially outward at the inner side end portion of the outer periphery, and for attaching the bearing device 1 to the vehicle body member 90. From the fixing flange 13 toward the outer side, An outer ring outer peripheral surface 15 is formed. The fixed flange 13 is provided with a plurality of through holes 14 through which the mounting bolts 91 pass. On the inner circumference of the outer ring member 10, an outer ring raceway 11 is formed on the outer side, and an outer ring raceway 12 is formed on the inner side.

  The outer ring end surface 16 is an end portion on the outer side of the outer ring member 10. A seal fitting surface 17 is formed at the outer end of the inner periphery of the outer ring member 10.

  The hub shaft 20 is made of an alloy steel such as S55C. The hub shaft 20 has a hub flange 22 that is radially increased in diameter at one end of the outer circumference in the axial direction, that is, at the outer end. A plurality of hub bolts 94 for fixing the brake disc 92 and the wheel 93 are embedded in the hub flange 22, and the brake disc 92 and the wheel 93 are attached.

  An inner ring fitting surface 23 is formed by radially reducing the diameter at the other axial end of the outer periphery of the hub shaft 20, that is, the inner end. An inner ring abutting surface 26 that is a plane perpendicular to the axis that expands from the outer end of the inner ring fitting surface 23 is formed. A first inner ring raceway 21 is formed on the outer periphery in the middle of the hub flange 22 and the inner ring fitting surface 23. A cylindrical slinger fitting surface 24 parallel to the axis is formed on the shoulder outer peripheral surface between the first inner ring raceway 21 and the base portion on the inner side of the hub flange 22.

  The inner ring 30 is an annular body made of bearing steel such as SUJ2. The inner ring 30 has a second inner ring raceway 31 formed at the center of the outer circumference in the axial direction, and an inner diameter surface 32 concentric with the second inner ring raceway 31 is formed at the inner circumference. The inner ring 30 has an inner diameter surface 32 fitted on the inner ring fitting surface 23 of the hub axle 20, an outer end face 33 abuts against the inner ring abutting face 26 of the hub axle 20, and an inner end 34 is made to be the hub axle. 20 is crimped by caulking at the inner side end portion and fixed to the hub shaft 20.

  The sealing device 50 includes a synthetic rubber seal member 51 and a metal slinger 60. The seal member 51 includes an annular cored bar 70 made of a metal such as a steel plate, and a seal part 52 made of synthetic rubber such as NBR formed by vulcanization integrally with the cored bar 70. The core metal 70 has a cylindrical portion 71 that fits inside the seal fitting surface 19 of the outer ring member 10, and a flat plate portion 72 that extends from the inner side end of the cylindrical portion 71 with a reduced diameter. The outer end surface of the cylindrical portion 71 is a pressed surface 73 that is perpendicular to the axis.

  The seal portion 52 has an auxiliary lip 56 on the inner side and a main lip 57 on the outer side, radially inward of the flat plate portion 72 of the core metal 70, and an outer side on the outer side of the flat plate portion 72 of the core metal 70. A side lip 58 that expands in the direction is formed. The third interval L3 is the axial interval between the outer end 59 of the side lip 58 and the pressed surface 73.

  The seal member 51 is attached to the outer ring member 10 by fitting the cylindrical portion 71 of the core metal 70 into the seal fitting surface 17 of the outer ring member 10. In a state where the seal member 51 is mounted on the outer ring member 10, the distance between the outer end surface 33 of the inner ring 30 and the front end portion 59 of the side lip 58 is set to the first distance L <b> 1. That is, the fifth interval L5 between the end surface 33 on the outer side of the inner ring 30 and the pressed surface 73 in the axial direction is the first interval L1 and the interval between the tip portion 59 of the side lip 58 and the pressure receiving surface 73. Equal to the sum of the sixth interval L6.

  The slinger 60 is made of a metal plate such as a stainless steel plate. The slinger 60 is an annular body having an L-shaped cross section, and includes a cylindrical portion 61 and a disc portion 62 that extends from the end portion on one side of the cylindrical portion 61 and extends. The thickness of the disk portion 62 in the axial direction is the plate thickness t. The inner periphery of the cylindrical portion 61 is a shaft fitting surface 63. The diameter of the shaft fitting surface 63 is slightly smaller than the diameter of the slinger fitting surface 24 of the hub shaft 20. The outer periphery of the cylindrical portion 61 is a radial sliding contact surface 64 with which the main lip 57 of the seal portion 53 comes into sliding contact.

  The side surface of the disc portion 62 on the seal portion 52 side, that is, the inner side is a side lip sliding contact surface 65 with which the side lip 58 of the seal portion 52 is in sliding contact. The side surface of the disk portion 62 on the hub flange 22 side, that is, the outer side is a slinger outer surface 66. The slinger 60 is fitted to the hub shaft 20 by fitting the shaft fitting surface 63 to the slinger fitting surface 24 which is the shoulder outer peripheral surface between the first inner ring raceway 21 and the hub flange 22 of the hub shaft 20.

  Further, the distance from the inner ring abutting surface 26 of the hub axle 20 to the side lip sliding contact surface 65 of the slinger 60 is the second distance L2. The second gap L2 is such that the interference between the disc portion 62 side of the side lip 58, that is, the outer end portion 59, and the side surface of the slinger 60 on the seal portion 52 side, that is, the side lip sliding contact surface 65 is a predetermined appropriate amount. The interval is set to a margin Δ.

  When the seal member 51 is mounted on the outer ring member 10 and the slinger 60 is mounted on the hub axle 20, the auxiliary lip 56 of the seal portion 52 and the inner peripheral tip of the main lip 57 are on the radial sliding contact surface 64 of the slinger 60. It is in sliding contact. The side lip 58 of the seal portion 52 is in sliding contact with the side lip sliding contact surface 65 of the slinger 60 at the outer end portion 59.

  An outer end surface 33 of the inner ring 30 is in contact with the inner ring abutting surface 26 of the hub axle 20. For this reason, the interference between the outer side tip portion 59 of the side lip 58 and the side lip sliding contact surface 65 of the slinger 60 is between the outer side end surface 33 of the inner ring 30 and the tip portion 59 of the side lip 58. This is the difference between the first interval L1 and the second interval L2 between the inner ring abutting surface 26 of the hub axle 20 and the side lip sliding contact surface 65 of the slinger 60. That is, the interference between the front end 59 of the side lip 58 and the side lip sliding contact surface 65 of the slinger 60 is determined only by the first interval L1 and the second interval L2, and the interference is not predetermined. It is equal to the margin Δ.

3 and 4 are explanatory views for explaining a method of assembling the wheel bearing device according to the first embodiment of the present invention.
Hereinafter, referring to FIGS. 2, 3, and 4, the mounting of the seal member 51 to the outer ring member 10 and the hub shaft of the slinger 60, which is a feature of the assembly method of the wheel bearing device 1 according to the first embodiment of the present invention. 20 and an example of a method for assembling the outer ring inner ring assembly 3 to which the seal member 51 is attached and the hub shaft 20 to which the slinger 60 is attached will be described. Here, the outer ring inner ring assembly 3 is an assembly of the outer ring member 10, the inner ring 30, and a plurality of balls in two rows respectively held by the cage 41.

Initially, the assembly method of the sealing member 51 of the wheel bearing apparatus of the 1st Embodiment of this invention is demonstrated.
As shown in FIG. 3, the seal press-fitting jig 100 is a ring made of steel. The seal press-fitting jig 100 includes three portions, that is, a guide portion 101, an intermediate portion 102, and a pressing portion 103 in the axial direction from one end side. The diameter of the outer periphery of the three parts is larger in the order of the guide part 101, the intermediate part 102, and the pressing part 103. A guide surface 104 is formed on the outer periphery of the guide portion 101, and the diameter of the guide surface 104 is slightly larger than the inner periphery 32 of the inner ring 30.

A seal positioning surface 105, which is a plane perpendicular to the axis, is formed between the end portion of the guide portion 101 on the intermediate portion 102 side and the outer periphery of the intermediate portion 102.
Between the end of the intermediate portion 102 on the pressing portion 103 side and the outer periphery of the pressing portion 103, a seal pressing surface 106 that is a plane perpendicular to the axis is formed. The diameter of the inner periphery of the seal positioning surface 112 is substantially equal to the diameter of the inner periphery of the core bar 70 of the seal member 51. The diameter of the outer periphery of the seal pressing surface 112 is larger than the diameter of the outer periphery of the core metal 70.

  An interval in the axial direction between the seal positioning surface 105 and the seal pressing surface 106 of the seal press-fitting jig 100 is formed to be equal to the fourth interval L4.

An assembly procedure of the seal member 51 of the wheel bearing device according to the first embodiment of the present invention will be described.
The outer ring inner ring assembly 3 shown in FIG. 3 is assembled by a conventional assembling method. The outer ring inner ring assembly 3 is an assembly of the outer ring member 10, the inner ring 30, and a plurality of balls in two rows respectively held by the cage 41. As shown in FIG. 3, the outer ring inner ring assembly 3 is installed on the base 110 of the seal assembling apparatus with the inner side surface 35 of the inner ring 30 in contact with the upper surface of the base 110.

  Next, the seal member 51 is supplied to the seal assembling apparatus using a seal member holding and moving means (not shown) such as a component supply robot, and the end on the inner side of the shaft fitting surface of the seal member 51 is connected to the outer ring member. It arrange | positions in the state which contact | connected the edge part of the outer side of the seal press-fit surface 24. FIG.

  The seal press-fitting jig 100 is moved from the upper outer side of the outer ring member 10 toward the inner side of the outer ring member 10 along the axis by a press-fitting jig moving means (not shown). Next, the seal press fitting jig 100 is moved in the inner side direction until the seal pressing face 106 of the seal press fitting jig 100 contacts the pressed face 73 of the seal member 51. Further, by moving the seal press-fitting jig 100 in the inner side direction and pressing the seal member 51 in the inner side direction, the seal member 51 moves on the seal fitting surface 17 of the outer ring member 10 to the inner side, and the seal member 51 press-fitting is performed.

  When the seal press-fit jig 100 moves in the inner side direction and the seal positioning surface 105 of the seal press-fit jig 100 reaches the outer end face 34 of the inner ring 30, the cylinder (not shown) is stopped. When the cylinder is stopped, the movement of the seal press-fitting jig 100 is stopped, and the mounting of the seal member 51 to the outer ring member 10 is completed. At this time, the distance between the outer side end surface 34 of the inner ring and the front end portion 59 of the side lip 58 of the seal member 51 is equal to the first distance L1.

  When the mounting of the seal member 51 is completed, a pressing spindle (not shown) is contracted in the axial direction on the outer side, and the seal press-fitting jig 100 is moved in the axial direction on the outer side by a moving means (not shown). keep away.

Next, a method for assembling the slinger 60 of the wheel bearing device 1 according to the first embodiment of the present invention will be described.
As shown in FIG. 4, the slinger press-fit jig 120 is made of steel. The slinger press-fit jig 120 is a bottomed cup-shaped ring. The slinger press-fitting jig 120 includes three portions, that is, a guide portion 121, an intermediate portion 122, and a tip portion 123 in the axial direction from one end portion side. The diameter of the inner periphery of the three parts is larger in the order of the guide part 121, the intermediate part 122, and the tip part 123. A guide surface 124 is formed on the inner periphery of the guide portion 121, and the diameter of the guide surface 124 is slightly larger than the diameter of the inner ring fitting surface 23 of the hub axle 20.

A slinger positioning surface 125, which is a plane perpendicular to the axis, is formed between the end portion of the guide portion 121 on the intermediate portion 102 side and the inner periphery of the intermediate portion 122. A slinger pressing surface 126, which is a plane perpendicular to the axis, is formed at the end of the distal end portion 123 on the open side. The inner peripheral diameter of the slinger pressing surface 126 is substantially equal to the inner peripheral diameter of the side lip sliding contact surface 65 of the slinger 60.
The axial interval between the slinger pressing surface 126 and the slinger positioning surface 125 is equal to the second interval L2.

Hereinafter, the assembly procedure of the slinger 60 of the wheel bearing device according to the first embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 4, the outer side surface 25 of the hub flange 22 is in contact with the upper surface of the base 130 and installed on the base 130.

  Next, the slinger holding and moving means (not shown) such as a component supply robot is used to supply the slinger 60, and the outer end of the shaft fitting surface 63 of the slinger 60 is connected to the slinger press-fitting surface 24 of the hub shaft 20. It arrange | positions in the state which contact | connected the edge part of an inner side.

  The slinger press-fitting jig 120 is moved from above the inner side of the hub shaft 20 toward the outer side of the hub shaft 20 along the axis by a press-fitting jig moving means (not shown). Next, the slinger press-fitting jig 120 is moved in the outer side direction until the slinger pressing surface 126 of the slinger press-fitting jig 120 comes into contact with the side lip sliding contact surface 65 of the slinger 60. Further, by moving the slinger press-fitting jig 120 in the outer side direction and pressing the slinger 60 in the outer side direction, the shaft fitting surface 63 of the slinger 60 moves on the slinger press-fitting surface 24 of the hub shaft 20 to the outer side. Then, the slinger 60 is press-fitted.

  When the slinger press-fitting jig 120 moves in the outer side direction and the slinger position surface 123 of the slinger press-fitting jig 120 reaches the inner ring abutting surface 26 of the hub axle 20, the movement of the slinger press-fitting jig 120 stops, and the hub axle of the slinger 60 Installation to 20 is completed. At this time, the distance from the inner ring abutting surface 26 of the hub shaft 20 to the side lip sliding contact surface 65 of the slinger is equal to the second distance L2.

Hereinafter, a method for assembling the outer ring inner ring assembly 3 to which the seal member 51 is mounted and the hub shaft 20 to which the slinger 60 is mounted will be described with reference to FIGS. Here, the outer ring inner ring assembly 3 is an assembly of the outer ring member 10, the inner ring 30, and a plurality of balls in two rows respectively held by the cage 41.
The hub shaft 20 to which the slinger 60 is mounted is disposed inside the outer ring inner ring assembly 3 to which the seal member 51 is mounted, and the inner ring fitting surface 23 of the hub shaft 20 is in contact with the inner diameter surface 32 of the inner ring 30. Thus, the hub shaft 20 is moved to the inner side in the axial direction. When the inner ring abutment surface 26 of the hub axle 20 reaches the outer end face 34 of the inner ring 30, the movement is stopped. The inner side end face 35 of the inner ring 30 is crimped by caulking the inner side end of the hub shaft 20 and fixed to the hub shaft 20.

At this time, the inner peripheral front ends of the auxiliary lip 56 and the main lip 57 of the seal member 51 are in contact with the radial sliding contact surface 64 of the slinger 60, and the outer lip 58 of the side lip 58 of the seal member 51 is the slinger 60. The side lip sliding contact surface 65 is contacted, and the assembly of the sealing device 50 is also completed.
In the sealing device 50 after the assembly is completed, the interference between the outer end portion 59 of the side lip 58 and the side lip sliding contact surface 65 of the disk portion 62 of the slinger 60 is a predetermined appropriate interference Δ. It becomes substantially equal, and the occurrence of excess or deficiency of the interference can be prevented.

  According to the first embodiment of the present invention, it is possible to prevent occurrence of excessive or insufficient interference between the side lip 58 and the slinger 60 of the sealing device 50 in the assembly process, and to provide a wheel bearing device 1 having excellent sealing performance. And the processing method of the wheel bearing apparatus 1 excellent in sealing performance can be provided.

(Second Embodiment).
A wheel bearing device according to a second embodiment of the present invention will be described with reference to the drawings.
FIG. 5 is a sectional view of the wheel bearing device 201 according to the second embodiment of the present invention.

The wheel bearing device 201 of the second embodiment is different from the wheel bearing device 1 of the first embodiment in that the slinger facing surface 25 is formed on the hub shaft 20 and the slinger mounting method is different from that of the wheel bearing device 1 of the first embodiment. This is common with the wheel bearing device 1 of the first embodiment.
In the wheel bearing device 201 of the second embodiment, the description of the shape, configuration, assembly method, and operational effects common to the wheel bearing device 1 of the first embodiment will be omitted, and the first embodiment will be omitted. Only the configuration, the assembly method, and the effects different from those of the wheel bearing device will be described. Moreover, about the component common with the wheel bearing apparatus of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the hub shaft 20, a slinger facing surface 227, which is a plane perpendicular to the axis, is formed on the inner side surface of the hub flange 22 whose diameter increases from the outer end of the slinger fitting surface 24. The slinger facing surface 227 is a reference surface for the axial position of the slinger 60. Both surfaces of the slinger facing surface 227 and the inner ring abutting surface 26 are simultaneously ground by one grindstone in which the shapes of both the slinger facing surface 227 and the inner ring abutting surface 26 are formed.

The fourth distance L4, which is the distance between the outer side surface 66 of the disk portion 62 of the slinger 60 and the slinger facing surface 227, is between the tip portion 59 of the side lip 58 and the side lip sliding surface 65 of the slinger 60. The interference is set to a predetermined appropriate interference Δ.
The third gap L3 between the slinger facing surface 225 and the inner ring abutting surface 26 is set to have a predetermined proper interference Δ, and the inner lip abutting surface 26 of the hub shaft 20 and the side lip of the slinger are in sliding contact with each other. This is the sum of the second distance L2 between the surface 65 and the fourth distance L4.

  The seventh distance L7 is a slinger facing surface from the slinger outer surface 66 where the interference between the tip portion 59 of the side lip 58 and the side lip sliding contact surface 65 of the slinger 60 is a predetermined appropriate interference Δ. This is a distance up to 225, which is a value obtained by subtracting the axial thickness t of the disk portion from the fourth interval.

FIG. 7 is an explanatory view illustrating a method of assembling the wheel bearing device according to the second embodiment of the present invention.
Hereinafter, an example of a method for mounting the slinger 60 on the hub shaft 20, which is a feature of the assembly method of the wheel bearing device 201 according to the second embodiment of the present invention, will be described with reference to FIGS. 5, 6, and 7.
The method for mounting the seal member 51 to the outer ring member 10 and the method for assembling the outer ring inner ring assembly 3 to which the seal member 51 is mounted and the hub shaft 20 to which the slinger 60 is mounted are described for the wheel of the first embodiment. Since it is the same as the assembly method of the bearing apparatus 1, description is abbreviate | omitted.

The positioning jig 140 is made of steel. The positioning jig 140 is a disk divided into two semicircles. Both side surfaces of the positioning jig 140 are a first plane 141 and a second plane 142 perpendicular to the axis. The distance between the first plane 141 and the second plane 142, that is, the axial width B of the positioning jig 140 is set so as to obtain the proper interference Δ, from the slinger outer surface 66 of the slinger 60 to the slinger facing of the hub shaft 20. It is equal to the 7th space | interval L7 which is a space | interval to the surface 227.
The diameter of the inner peripheral surface 143 of the positioning jig 140 is larger than the diameter of the slinger mounting surface 24 of the hub shaft 20.

The slinger press fitting jig 150 is made of steel. The slinger press-fit jig 150 is a bottomed cup-shaped ring. The slinger press-fitting jig 150 includes three portions, that is, a guide portion 151, an intermediate portion 152, and a tip portion 153 in the axial direction from the bottom end portion side. The diameter of the inner periphery of the three parts is larger in the order of the guide part 151, the intermediate part 152, and the tip part 153. A guide surface 154 is formed on the inner periphery of the guide portion 151, and the diameter of the guide surface 154 is slightly larger than the diameter of the inner ring fitting surface 23 of the hub shaft 20.
A slinger pressing surface 155 that is a plane perpendicular to the axis is formed at the open end of the tip 153. The diameter of the inner peripheral surface 156 of the tip 153 is slightly larger than the diameter of the radial sliding contact surface 64 of the slinger 60.

Hereinafter, an assembly procedure of the wheel bearing device according to the embodiment of the present invention will be described.
As shown in FIG. 3, the hub shaft 20 that has been processed as a single unit, such as the hub flange 22, the inner ring raceway 31, the inner ring press-fitting surface 23, and the slinger press-fitting surface 24, has a side surface 25 on the outer side of the hub flange 22. In contact with the upper surface of the base 130, the base 130 is installed.

Next, each of the divided positioning jigs 140 is set on the hub shaft 20 with the first flat surface 141 in contact with the slinger facing surface 227 of the hub flange 22.
Next, the slinger holding and moving means (not shown) such as a component supply robot is used to supply the slinger 60, and the outer end of the shaft fitting surface 63 of the slinger 60 is connected to the slinger press-fitting surface 24 of the hub shaft 20. It arrange | positions in the state which contact | connected the edge part of an inner side.

  The press-fit jig 150 is moved from the upper side on the inner side of the hub shaft 20 toward the outer side of the hub shaft 20 along the axis by a press-fit jig moving means (not shown). The press-fit jig 150 is moved in the outer side direction until the slinger pressing surface 155 of the press-fit jig 150 contacts the side lip sliding contact surface 65 of the slinger 60. Further, by moving the press-fitting jig 150 in the outer side direction and pressing the slinger 60 in the outer side direction, the shaft fitting surface 63 of the slinger 60 moves on the slinger press-fitting surface 24 of the hub shaft 20 to the outer side. The slinger 60 is press-fitted.

  When the press-fitting jig 150 is moved in the outer side direction and the slinger outer surface 66 of the slinger 60 comes into contact with the second plane 142 of the positioning jig 140, the movement of the press-fitting jig 150 is stopped and the slinger 60 moves to the hub shaft 20. Installation is complete.

As described above, according to one embodiment of the present invention, the distance between the slinger outer surface 66 of the disk portion 62 of the slinger 60 after the slinger 60 is mounted and the slinger facing surface 227 of the hub flange 22 is the axis of the positioning jig 140. It is equal to the direction width B and is kept accurate.
Here, the axial width B of the positioning jig 120 obtains an appropriate interference Δ between the outer side end portion 59 of the side lip 58 and the side lip sliding contact surface 65 of the disk portion 62 of the slinger 60. Therefore, it is equal to the seventh interval L7 between the slinger outer surface 66 of the disk portion 62 and the slinger facing surface 25 of the hub flange 22 set for this purpose.

  That is, the interference between the outer end 59 of the side lip 58 and the side lip sliding contact surface 65 of the disk portion 62 of the slinger 60 after the assembly of the sealing device 50 is a predetermined appropriate interference Δ. The process of attaching the slinger 60 to the hub shaft 20 can prevent the interference of the interference from occurring.

  The positioning jig 140 has an annular shape divided into two halves, and can be easily moved in and out of the slinger facing surface 227 on the inner side of the hub flange 22 by means of a simple moving means. Can do.

  In the second embodiment, the seventh interval L7, which is the interval between the slinger outer surface 66 and the slinger facing surface 225, has a structure that is a value obtained by subtracting the axial plate thickness t of the disk portion from the fourth interval. In the present invention, the fourth interval may be equal to the plate thickness t, and the seventh interval L7 may be zero.

  In the above-described embodiment, the rolling element is a ball. However, in this invention, the rolling element may be another type of rolling element such as a tapered roller.

  In the above-described embodiment, the hub shaft 20 and the inner ring 30 are integrated by caulking at the end of the hub shaft 20, but in the present invention, the hub shaft 20 and the inner ring 30 are connected by other coupling means such as nut fastening. An integrated form may be used.

  In the above-described embodiment, the sealing device 50 includes the auxiliary lip 56, the main lip 57, and one side lip 58. However, in the present invention, the sealing device has a different number of side lips or a main lip. Another type of sealing device may be used, such as a type without a lip.

  The present invention is not limited to such embodiments, and can naturally be implemented in various modes without departing from the gist of the present invention.

1,200 ... Bearing device (bearing device for wheel)
DESCRIPTION OF SYMBOLS 10 ... Outer ring member 11, 12 ... Outer ring raceway 2 ... Bearing inner space 20 ... Hub shaft 21 ... First inner ring raceway 22 ... Hub flange 227 ... Slinger facing surface 23 ... Inner ring fitting portion 24 ... Slinger fitting surface (shoulder outer peripheral surface) )
25 ... Inner ring contact surface 30 ... Inner ring 31 ... Second inner ring raceway 33 ... End face 40 ... Ball (rolling element)
50 ... Sealing device 51 ... Sealing member 52 ... Sealing part 58 ... Side lip 60 ... Slinger 61 ... Cylindrical part 62 ... Disk part 65 ... Side lip sliding contact surface (side face)
66 ... Slinger outer side (side)
70 ... Core metal 73 ... Pressed surface L1 ... 1st interval L2 ... 2nd interval L3 ... 3rd interval L4 ... 4th interval L5 ... 5th interval L6 ... 6th interval 100 ... Seal press-fit jigs 120, 150 ... Slinger press-fit Jig 140 ... Slinger positioning jig Δ ... Interference L1 ... Spacing

Claims (6)

An outer ring member having a pair of outer ring raceways formed on the inner periphery, an inner ring having a first inner ring raceway formed on the outer periphery,
A second inner ring raceway is formed on the outer periphery, and has a hub flange extending radially outward at one end in the axial direction, and externally fitting the inner ring at the other end in the axial direction. A hub axle having an inner ring mating surface;
A plurality of rolling elements in two rows that roll between one outer ring raceway and the first inner ring raceway and between the other outer ring raceway and the second inner ring raceway;
A sealing device for sealing an opening on the hub flange side of a bearing internal space between the outer ring member and the hub shaft;
The sealing device includes a metal slinger, a seal member having a metal cored bar and a synthetic rubber seal,
The slinger includes a cylindrical portion fitted on a shoulder outer peripheral surface between the second inner ring raceway of the hub shaft and the hub flange, and a radially outwardly extending end portion of the cylindrical portion on the hub flange side. And a disk portion that is
The seal part has a side lip that faces the disk part and expands in the direction of the disk part,
An end of the side lip on the disk part side is a wheel bearing device that is in sliding contact with a side surface on the seal part side of the disk part with a predetermined appropriate interference,
The hub shaft has an inner ring abutting surface that abuts an end surface of the inner ring on the hub flange side,
A first distance between an end surface of the inner ring on the hub flange side and a tip portion of the side lip on the disk portion side, and a space between the inner ring abutting surface and a side surface of the disk portion on the seal portion side. The difference from the second interval is
The wheel bearing device according to claim 1, wherein the wheel bearing device is set equal to a predetermined appropriate margin. The hub shaft has a slinger facing surface serving as a reference for the axial position of the slinger on the slinger side of the hub flange,
The third distance between the inner ring butting surface and the slinger facing surface is:
It was set to be equal to the sum of the fourth interval and the second interval between the slinger facing surface and the side surface of the disc portion on the seal portion side, which was set to obtain the appropriate interference. The wheel bearing device according to claim 1.   The wheel bearing device machining method according to claim 2, wherein both the inner ring abutting surface and the slinger facing surface are ground simultaneously with a single grindstone. Processing method.   The wheel bearing device assembly method according to claim 1 or 2, comprising: a seal pressing surface that presses the seal member; and a seal positioning surface that contacts the end surface of the inner ring on the hub flange side. And a fifth space between the seal pressing surface and the seal positioning surface is set in order to obtain the first space and the proper interference, and the pressed surface and the side of the seal member A method of assembling a wheel bearing device, wherein the seal member is attached to the outer ring member using a seal press-fitting jig equal to the sum of the sixth gap between the end of the lip and the disc portion side. .   The wheel bearing device assembly method according to claim 1 or 2, wherein a slinger pressing surface that presses a side surface of the disk portion of the slinger on the seal portion side, and the inner ring abutment of the hub axle. A slinger positioning surface abutting on the surface, wherein the slinger is mounted on the hub shaft using a slinger press-fitting jig in which the interval between the slinger pressing surface and the slinger positioning surface is equal to the second interval. To assemble a wheel bearing device.   The wheel bearing device assembly method according to claim 2, wherein the axial width is equal to a value obtained by subtracting a plate thickness of the disk portion of the slinger from the fourth interval, and is plural in the circumferential direction. A split annular slinger positioning jig is disposed between a side surface of the slinger on the hub flange side and a surface facing the slinger of the hub flange, and the slinger is press-fitted into the hub shaft. To assemble a wheel bearing device.

Images