JP6671909B2 - Press-fitting method of sealing device with encoder ring - Google Patents

Description

The present invention is used with a wheel of an automobile or the like on the wheel support bearing assembly for rotatably supporting with respect to the suspension apparatus, and a press-fitting method of the sealing device having a Rue emissions coder ring detecting the rotational speed of the wheel .

  2. Description of the Related Art Generally, a bearing device for a wheel, which rotatably supports a wheel of a vehicle with respect to a suspension device, controls an anti-lock brake system (ABS), and includes a rotation speed detection device for detecting a rotation speed of the wheel, is generally used. Are known. Conventionally, such a wheel bearing device is provided with a sealing device between an inner member and an outer member that are in rolling contact with each other via a rolling element, and the sealing device includes a magnetic encoder having magnetic poles arranged alternately in a circumferential direction. A magnetic encoder and a rotational speed sensor that is disposed facing the magnetic encoder and detects a change in magnetic pole of the magnetic encoder due to rotation of the wheel.

  FIG. 7 shows an encoder ring that detects the rotational speed of a wheel. The encoder ring 51 includes a support ring 52 having an L-shaped cross section and a ring shape as a whole, and a magnetic encoder 53 integrally joined to a side surface of the support ring 52 by vulcanization bonding or the like. The ring 52 includes a cylindrical fitting portion 52a that is pressed into the outer peripheral surface of the inner ring 54, and a standing plate portion 52b that is formed to be bent radially inward from the fitting portion 52a. The magnetic encoder 53 is formed by forming a permanent magnet such as a rubber magnet in an annular shape, and is magnetized so that the magnetic poles N and S appear alternately in the circumferential direction.

  A protective cover 56 is attached to the outer member 55. The protective cover 56 is formed in a cup shape by injection molding of a non-magnetic synthetic resin. The protective cover 56 has a cylindrical fitting portion 56 a which is fitted inside the outer member 55, and a radially outer portion extending from the fitting portion 56 a. And a flange 56b that is formed to protrude from the outer member 55 and closely contacts the end surface 55a of the outer member 55, and a bottom 56c that extends radially inward from the flange 56b and closes the end of the inner ring 54.

  A core metal 57 formed into a substantially L-shaped cross section by press working from a steel plate is insert-molded at the portion of the fitting portion 56a and the flange portion 56b, and a detection portion 58 of a rotation speed sensor is located near the outer surface of the bottom portion 56c. The magnetic encoder 53 is opposed to the magnetic encoder 53 via a predetermined air gap. Except for the facing portion, a rib 59 is formed to protrude from the outer surface of the bottom portion 56c in order to increase the rigidity of the protective cover 56 and suppress deformation. The presence of the protective cover 56 prevents water, iron powder, magnetic debris, and the like from entering between the detection unit 58 of the rotational speed sensor and the magnetic encoder 53, thereby preventing damage to the magnetic encoder 53. (For example, see Patent Document 1).

  As shown in FIG. 8A, a method of press-fitting the encoder ring 51 into the inner ring 54 is such that a press-fitting jig 60 is opposed to a side surface of the magnetic encoder 53 of the encoder ring 51, and as shown in FIG. When the press-fitting jig 60 is pressed against a desired stroke in the axial direction in a state where the press-fitting jig is in contact with the side surface of the magnetic encoder 53, the jig is press-fitted and fixed to the outer peripheral surface of the inner ring 54.

  However, in the support ring 52 of the encoder ring 51 having an L-shaped cross section, the fitting surface with the inner ring 54 (the inner diameter surface of the fitting portion 52a) and the center of the side surface of the magnetic encoder 53 to be pressed are not eccentric but aligned. Therefore, the support ring 52 may be deformed by the press-fit load. Due to this deformation, the single pole error and the cumulative pitch error of the magnetized magnetic poles N and S of the magnetic encoder 53 deteriorate, and the detection accuracy decreases.

  Further, as shown in FIG. 9, a sealing device 61 in which such an encoder ring is integrally formed is also known. The sealing device 61 includes an annular core metal 62, a slinger (encoder ring) 63, an annular seal member 64, and a magnetic encoder 65.

  The annular core bar 62 is formed by bending a metal plate as a fixed-side annular member, and includes a cylindrical core bar 62a and an annular core bar 62b extending radially inward from an end edge of the cylindrical core bar 62a. And an L-shaped cross section.

  The slinger 63 is formed by bending a metal plate such as a rust-proofed rolled steel plate as a rotating side annular member, and extends radially outward from a cylindrical slinger portion 63a and an end edge of the cylindrical slinger portion 63a. An annular slinger portion 63b is formed to have an L-shaped cross section. The slinger 63 is provided with a protrusion 66 that protrudes axially outward from the surface of the magnetic encoder 65. The protruding portion 66 is formed over the entire circumference by bending the slinger 63 outward in the axial direction at a bent portion of the slinger 63 having an L-shaped cross section, that is, at a portion where the cylindrical slinger portion 63a and the annular slinger portion 63b intersect. Have been.

  Since the outer surface B of the annular core portion 62b and the tip C of the cylindrical slinger portion 63a are substantially flush with each other in the axial direction, when the sealing device 61 is stacked and handled by the projecting portion 66 of the slinger 63, the lower stage is used. A gap A is formed between the magnetic encoder 65 of the sealing device 61 and the outer surface B of the annular core portion 62b of the upper sealing device 61. Due to the gap A, the magnetic attraction force on the annular core portion 62b due to the magnetic force of the magnetic encoder 65 becomes extremely small.

  As described above, since the magnetic attraction force of the upper and lower sealing devices 61 is weak, the sealing devices 61 are smoothly separated from each other, and the combined annular core metal 62 and the slinger 63 are displaced or come off. No more. Further, when the sealing device 61 is taken out of the box and sent to the assembling machine, the stacked sealing devices 61 may be slid horizontally to be removed. During this extraction operation, the magnetic attraction force of the upper and lower sealing devices 61 is weak, and the magnetic encoder 65 and the annular core portion 62b are not in contact with each other, so that the magnetic encoder 65 can be smoothly extracted without being damaged. Can be. The projecting portion 66 is formed to be bent toward the cylindrical slinger portion 63a of the slinger 63, and a portion for press-fitting and fixing the slinger 63 to an inner ring (not shown) is reinforced by the projecting portion 66, and the slinger 63 is firmly fixed. It can be fixed to the inner ring (for example, see Patent Document 2).

JP 2011-149836 A JP 2004-36817 A

  As shown in FIG. 10A, the mounting method of the sealing device 61 is such that the press-fitting jig 67 is opposed to the inner side surface D of the annular cored bar 62 and the side surface of the magnetic encoder 65 having a wide flat surface. ), The press-fitting jig 67 is pressed in the axial direction by a desired stroke in a state where the press-fitting jig 67 is in contact with the inner side surface D of the annular cored bar 62 and the side surface of the magnetic encoder 65, so that the outer ring 68 and the inner ring 69 The sealing device 61 is press-fitted and fixed to an opening formed between the sealing device 61 and the opening.

  However, although the slinger 63 is reinforced by the protruding portion 66, like the encoder ring 51 described above, the side of the magnetic encoder 65 pressed against the fitting surface with the inner ring 69 (the inner diameter surface of the cylindrical slinger portion 63 a). Since the center is not on the same straight line and is eccentric, the slinger 63 is deformed by the press-fitting load, and the magnetic pole N, S single pitch error and the cumulative pitch error of the magnetized magnetic encoder 65 are deteriorated, and the detection accuracy is reduced. There is a risk that it will.

  The present invention has been made in view of such a conventional problem, and by devising a configuration of an encoder ring and a press-fitting method thereof, a fitting surface of a support ring (core bar) of the encoder ring and a press-fitting jig are provided. Focusing on press-fitting so that the center of the pressing surface is on the same straight line without eccentricity, the deformation of the encoder ring due to press-fitting is suppressed to prevent a decrease in detection accuracy and improve the reliability of the encoder ring. An object of the present invention is to provide a press-fitting method and a press-fitting method for a sealing device provided with the encoder ring.

In order to achieve the above object, an invention according to claim 1 of the present invention includes an encoder ring that is mounted on a wheel bearing that rotatably supports a wheel with respect to a suspension device and detects a rotation speed of the wheel. In the press-fitting method of the provided sealing device, the sealing device comprises an annular seal plate and an encoder ring arranged to face each other, and the seal plate is press-fitted to the inner peripheral surface of the outer member, A side lip integrally joined to the core bar and extending inclining radially outward; a dust lip and a grease slip formed in a forked shape on an inner diameter side of the side lip; The support ring is mounted on the inner member of the bearing for use, and is formed of a support ring formed in an annular shape, and an encoder whose characteristics are alternately and circumferentially changed at equal intervals in the circumferential direction. A cylindrical fitting portion press-fitted into the outer peripheral surface of the inner member, a standing plate portion extending radially outward from the fitting portion, and the standing plate portion and the fitting portion. The crossing portion has a projection formed by overlapping the end of the fitting portion, is formed as a whole from a steel plate into an L-shaped cross section, and the encoder is integrally joined to a side surface of the standing plate portion, This encoder is composed of a magnetic encoder in which magnetic powder is mixed into an elastomer and magnetic poles N and S are alternately magnetized in the circumferential direction at equal intervals, and a circle is formed on the protruding portion of the support ring and a side surface of the magnetic encoder. An annular press-fitting jig is opposed, and the pressing surface of the press-fitting jig is set to the thickness of the protruding portion, and a recess is formed in a portion facing the encoder so that the press-fitting jig does not interfere with the encoder. The side lip is formed and the encoder ring is The dust ring and the grease slip are slidably contacted with the upright plate portion of the support ring with the axial direction shim and the pack seal is slidably contacted with the fitting portion of the support ring with the radial direction shim sill. The jig is pressed in the axial direction with the pressing surface of the jig abutting against the end surface of the seal plate and the side surface of the protruding portion of the support ring.

As described above, in the press-fitting method of the sealing device provided with the encoder ring for detecting the rotation speed of the wheel, which is mounted on the wheel bearing that rotatably supports the wheel with respect to the suspension device, the sealing devices are arranged to face each other. An annular seal plate and an encoder ring, wherein the seal plate is press-fitted to the inner peripheral surface of the outer member, and a side which is integrally joined to the core bar and extends obliquely outward in the radial direction. A lip, a dust lip and a grease slip formed in a forked shape on an inner diameter side of the side lip, and an encoder ring is mounted on an inner member of the wheel bearing, and a support ring formed in an annular shape; The support ring is formed from a steel plate to have an L-shaped cross section, and has a cylindrical fitting portion that is press-fitted to the outer peripheral surface of the inner member. , This mating A vertical plate portion extending radially outward from the vertical plate, and a protruding portion formed by overlapping an end of the fitting portion at an intersection of the vertical plate portion and the fitting portion, and a cross section L as a whole from the steel plate. An encoder is integrally joined to the side surface of the standing plate portion, and this encoder is a magnetic encoder in which magnetic powder is mixed into an elastomer and magnetic poles N and S are alternately magnetized in a circumferential direction. The press-fitting jig is made to face the protrusion of the support ring and the side of the magnetic encoder, and the pressing surface of the press-fitting jig is set to the thickness of the protrusion, and the press-fitting jig interferes with the encoder. A recess is formed in a portion facing the encoder so that the side lip is slidably contacted with the upright portion of the support ring of the encoder ring in the axial direction, and the dust lip and the grease slip are supported by the support ring. In the radial direction It is composed of a pack seal that is slid in contact with white, and is press-fitted in the axial direction with the pressing surface of the press-fitting jig in contact with the end surface of the seal plate and the side surface of the protruding portion of the support ring. To provide a press-fitting method of a sealing device in which a press-fit load is applied on the same straight line without eccentricity with a ring fitting surface, deformation of an encoder ring due to press-fit is suppressed, detection accuracy is prevented from lowering, and reliability is improved. Can be.

It is preferable as defined in claim 2, if the side surface of the end face and the projecting portion of the support ring that are configured substantially flush, the pressing surface of the press-fitting jig grinding such a surface of the sealing plate It is possible to improve the workability, improve the dimensional accuracy, and improve the positioning accuracy of the sealing device.

Further, if the side surface of the projecting portion of the support ring is formed in an arc shape as in the invention according to claim 3 , the pressing surface of the press-fitting jig is brought into contact with the side surface to press-fit in the axial direction. When compared to the contact between surfaces, the support ring is not pressed in a twisted state, and a press-fit load is applied on the same straight line without eccentricity with the fitting surface of the encoder ring, further suppressing deformation of the encoder ring due to press-fit. Can be.

The press-fitting method for a sealing device according to the present invention is a press-fitting method for a sealing device equipped with an encoder ring that is mounted on a wheel bearing that rotatably supports a wheel with respect to a suspension device and that detects a rotation speed of the wheel. The sealing device includes an annular seal plate and an encoder ring that are arranged to face each other, and the seal plate is press-fitted to an inner peripheral surface of an outer member, and is integrally joined to the core, A side lip extending obliquely outward in the radial direction, a dust lip and a grease slip formed in a forked shape on the inner side of the side lip, and the encoder ring is mounted on an inner member of the wheel bearing. A support ring formed in an annular shape, and an encoder whose characteristics are alternately changed in the circumferential direction and change at equal intervals, wherein the support ring is formed in an L-shaped cross section from a steel plate, A cylindrical fitting portion press-fitted into the outer peripheral surface of the material, an upright portion extending radially outward from the fitting portion, and an intersecting portion between the upright portion and the fitting portion. A projection formed by superimposing the ends of the steel plate, formed as a whole from a steel plate into an L-shaped cross section, and the encoder is integrally joined to the side surface of the upright plate portion. And a magnetic encoder in which magnetic poles N and S are alternately magnetized in the circumferential direction at equal intervals, and an annular press-fitting jig is made to face a projecting portion of the support ring and a side surface of the magnetic encoder. The pressing surface of the press-fitting jig is set to the thickness of the protruding portion, so that the press-fitting jig does not interfere with the encoder, a recess is formed in a portion facing the encoder, and the side lip has Axial direction on the upright part of the support ring of the encoder ring The dust lip and the grease slip are slid in contact with each other, and the dust lip and the grease slip are formed by a pack seal slid in contact with the fitting portion of the support ring with a radial squeezable. The end face of the support ring and the side face of the protruding portion of the support ring are press-fitted in the axial direction in a state where the press-fit load is applied on the same straight line without eccentricity with the fitting surface of the encoder ring. It is possible to provide a press-fitting method for a sealing device in which deformation is suppressed, detection accuracy is prevented from lowering, and reliability is improved.

It is a longitudinal section showing one embodiment of the bearing device for wheels with which the encoder ring concerning the present invention was attached. It is a longitudinal cross-sectional view which shows the encoder ring single body of FIG. (A) is a longitudinal sectional view showing a modified example of the encoder ring of FIG. 2, (b) is a longitudinal sectional view showing a modified example of (a), and (c) is another modified example of (a). FIG. FIGS. 2A and 2B are explanatory diagrams showing a method of press-fitting the encoder ring of FIG. 2, wherein FIG. 3A shows a state before press-fitting, FIG. 3B shows a state after press-fitting, and FIG. In the explanatory view showing the method, before press-fitting is shown, and (d) shows after press-fitting. It is a longitudinal cross-sectional view which shows the sealing device provided with the encoder ring of FIG.3 (c). 6A and 6B are explanatory views showing a press-fitting method of the sealing device of FIG. 5, wherein FIG. 5A shows a state before press-fitting, and FIG. It is a principal part enlarged view which shows the bearing device for wheels with the conventional encoder ring mounted. 8A and 8B are explanatory diagrams illustrating a press-fitting method of the encoder ring in FIG. 7, wherein FIG. 7A illustrates a state before press-fitting, and FIG. It is a longitudinal section showing the conventional sealing device with which the encoder ring was constituted in one. 9A and 9B are explanatory views showing a press-fitting method of the sealing device in FIG. 9, wherein FIG. 9A shows a state before press-fitting, and FIG. 9B shows a state after press-fitting.

  A method for press-fitting an encoder ring that is used for a wheel bearing that rotatably supports a wheel with respect to a suspension device and detects a rotation speed of the wheel, wherein the encoder ring is a rotation-side member of the wheel bearing. A support ring formed into an annular shape by press-fitting on the outer peripheral surface of the magnetic disk, and a magnetic encoder in which magnetic powder is mixed into an elastomer and magnetic poles N and S are alternately magnetized in a circumferentially equidistant manner. A support ring is formed from a steel plate into an L-shaped cross section, and has a cylindrical fitting portion press-fitted into the outer peripheral surface of the inner race, a standing plate portion extending radially inward from the fitting portion, and the standing plate. A protrusion formed by overlapping an end of the fitting portion at an intersection of the fitting portion and the fitting portion, and the magnetic encoder is integrally joined to a side surface of the upright portion, and The pressing surface of the press-fitting jig is brought into contact with the side of the protrusion of the ring. It is press-fitted in the axial direction in the state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing one embodiment of a wheel bearing device equipped with an encoder ring according to the present invention, FIG. 2 is a longitudinal sectional view showing the encoder ring alone of FIG. 1, and FIG. 2 is a longitudinal sectional view showing a modified example of the encoder ring of FIG. 2, (b) is a longitudinal sectional view showing a modified example of (a), and (c) is a longitudinal sectional view showing another modified example of (a). 4A and 4B are explanatory views showing a press-fitting method of the encoder ring of FIG. 2, wherein FIG. 4A shows a state before press-fitting, FIG. 4B shows a state after press-fitting, and FIG. It is an explanatory view showing a press-fitting method of the encoder ring shown, before press-fitting, (d) shows after press-fitting, FIG. 5 is a longitudinal sectional view showing a sealing device provided with the encoder ring of FIG. 6A and 6B are explanatory views showing a press-fitting method of the sealing device in FIG. 5, wherein FIG. 6A shows a state before press-fitting, and FIG. 6B shows a state after press-fitting. In the following description, a side closer to the outside of the vehicle when assembled to the vehicle is referred to as an outer side (left side in FIG. 1), and a side closer to the center is referred to as an inner side (right side in FIG. 1).

  The wheel bearing device shown in FIG. 1 is referred to as a third generation on the driven wheel side, and is configured by unitizing a hub wheel 1 and a double-row rolling bearing 2. The double-row rolling bearing 2 includes an inner member 3 and an outer member 4, and double-row rolling elements (balls) 5 and 5 rotatably accommodated between the two members 3, 4. The inner member 3 includes a hub wheel 1 and an inner ring 7 press-fitted and fixed to the hub wheel 1.

  The hub wheel 1 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end on the outer side, and one (outer side) inner rolling surface 1a on the outer circumference and the inner rolling surface. An axial small-diameter stepped portion 1b extending in the axial direction from the surface 1a is formed. Further, hub bolts 6a for fastening the wheels are implanted at circumferentially equal positions of the wheel mounting flange 6.

  The inner ring 7 has the other (inner side) inner rolling surface 7a formed on the outer periphery, and is press-fitted into the small-diameter step portion 1b of the hub wheel 1 via a predetermined shim. Then, the end of the small-diameter stepped portion 1b is plastically deformed radially outward to form a caulked portion 1c, and a predetermined bearing preload is applied to the inner ring 7 with respect to the hub wheel 1 by the caulked portion 1c. It is fixed in the axial direction in the state.

  The hub wheel 1 is formed of a medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes an inner rolling surface 1a and an inner side of a wheel mounting flange 6 serving as a seal land portion of a seal 9 described later. From the base 6b to the small-diameter stepped portion 1b is hardened by induction hardening to a surface hardness of 58 to 64 HRC. The caulked portion 1c is an unquenched portion having a surface hardness of 25HRC or less after forging. The inner ring 7 is made of a high carbon chromium bearing steel such as SUJ2, and is hardened to a core portion by hardening in the range of 58 to 64 HRC. The rolling elements 5 are made of high-carbon chromium bearing steel such as SUJ2, and have been hardened to the core by subbing quenching in the range of 62 to 67 HRC.

  On the other hand, the outer member 4 integrally has a vehicle body mounting flange 4b on the outer periphery for being fixed to a knuckle (not shown) constituting a suspension device, and has an inner periphery on the inner side of the double row of the inner member 3. Double rows of outer rolling surfaces 4a, 4a facing the rolling surfaces 1a, 7a are integrally formed. The outer member 4 is formed of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least the double-row outer rolling surfaces 4a, 4a have a surface hardness of 58 to 64HRC by induction hardening. The area has been hardened. Double rows of rolling elements 5, 5 are accommodated between both rolling surfaces 4a, 1a and 4a, 7a, and these double rows of rolling elements 5, 5 are held by rollers 8, 8 so as to be able to roll freely. I have.

  Further, seals 9 and 10 are attached to the openings of the annular space formed between the outer member 4 and the inner member 3, and leakage of the lubricating grease sealed in the bearing to the outside and from the outside. Prevents rainwater and dust from entering the bearing. Further, a cover 11 is attached to the inner-side opening end of the outer member 4 to close the inner-side opening of the outer member 4, thereby preventing rainwater, dust, and the like from entering the detection unit from the outside. ing.

  Since the inner opening of the outer member 4 is closed by the cover 11, the seal 10 is basically unnecessary, but here, the seal 10 is attached to the inner end of the outer member 4. Is mounted, it is possible to seal the leakage of the grease sealed in the bearing with the seal 10. That is, since the sealed grease does not flow into the cover 11, the amount of grease sealed can be minimized, the weight and cost can be reduced, and the grease during operation can be stirred. The temperature rise of the bearing can be suppressed.

  In the present embodiment, the double-row rolling bearing 2 is exemplified by a double-row angular ball bearing having the rolling elements 5 and 5 as balls. However, the present invention is not limited to this, and tapered rollers may be used for the rolling elements. It may be constituted by a double row tapered roller bearing described above. Although the third generation structure has been exemplified, the invention is not limited to this, and a so-called second generation structure in which a pair of inner rings is press-fitted into the hub wheel at a small diameter step portion of the hub wheel may be used. A fourth-generation wheel bearing device in which a hub wheel, a double-row rolling bearing, and a constant velocity universal joint are unitized may be used.

  In the present embodiment, the encoder ring 12 is press-fitted to the outer diameter of the inner ring 7. The encoder ring 12 includes a support ring 13 formed in an annular shape, and a magnetic encoder 14 integrally joined to a side surface of the support ring 13 by vulcanization bonding or the like. This magnetic encoder 14 constitutes a rotary encoder for detecting the rotational speed of a wheel by mixing magnetic powder such as ferrite into an elastomer such as rubber and alternately magnetizing the magnetic poles N and S in the circumferential direction. I have. In the present invention, the magnetic encoder 14 made of a rubber magnet has been exemplified. However, the present invention is not limited to this. Any configuration may be used as long as the characteristics alternately and circumferentially change at equal intervals. The magnetic poles N and S may be formed of a sintered alloy. Also, a plastic magnet may be used.

  The cover 11 is internally fitted and fixed to the inner opening end of the outer member 4, and the opening of the outer member 4 is closed. The cover 11 is made up of a synthetic resin-covered cylindrical cover body 15 having a bottom, and a core 16 integrally molded in an opening of the cover body 15.

  The cover main body 15 is formed by injection molding from a non-magnetic special ether synthetic resin material such as polyphenylene sulfide (PPS), and further contains a reinforcing material such as GF (glass fiber) in an amount of 30 to 50 wt%. Thereby, the sensing performance of the rotation speed sensor 18 described later is not adversely affected, the corrosion resistance is excellent, the strength and rigidity are increased, and the durability can be improved over a long period of time. In addition, the cover main body 15 can be exemplified by an injection-moldable synthetic resin such as PA (polyamide) 66, PA6.12, PPA (polyphthalamide), and PBT (polybutylene terephthalate) other than the above-described materials. Further, the fibrous reinforcing material is not limited to GF, but may be CF (carbon fiber), aramid fiber, boron fiber, or the like.

  The cover body 15 has a cylindrical fitting portion fitted to the inner periphery of the end of the outer member 4, projects radially outward from the fitting portion, and comes into close contact with the inner end surface of the outer member 4. It has a collar and a bottom. A mounting portion 17 that protrudes in the axial direction is formed integrally with a radially outer portion of the bottom portion. The mounting portion 17 includes a cylindrical insertion portion 17a to which the sensor unit 18 is mounted, and the sensor unit 18 is fixed by a fixing bolt (not shown).

  The metal core 16 is formed into an annular shape having an L-shaped cross section by, for example, pressing a stainless steel plate or a cold-rolled steel plate. In particular, the core 16 is preferably formed of a non-magnetic steel plate, for example, an austenitic stainless steel plate (such as SUS304 based on JIS) so as not to adversely affect the sensing performance of the rotation speed sensor.

  The support ring 13 of the encoder ring 12 is made of a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS SUS430 or the like) or a rust-proof cold-rolled steel plate (JIS SPCC or the like). ) Is formed into a substantially L-shaped cross section by press working, and as shown in an enlarged view in FIG. 2, a cylindrical fitting portion 13 a that is press-fitted into the inner ring 7, and a radially inward direction from the fitting portion 13 a. An elongate standing plate portion 13b and a protruding portion 13c formed by overlapping the inner end of the fitting portion 13a at the intersection of the fitting portion 13a and the standing plate portion 13b are provided. The magnetic encoder 14 is integrally joined to the inner side surface of the standing plate portion 13b by vulcanization bonding or the like. The end surface 19 of the protrusion 13c and the side surface 14a of the magnetic encoder 14 are set substantially flush with each other in the axial direction. Here, the “substantially flush” is, for example, a target value of the design, which means that it includes a condition of the finished state of each member and an error at the time of joining, and a state where there is substantially no step. That is, a step caused by a processing error, an adhesion error, or the like is to be naturally allowed.

  FIGS. 3A to 3C show modified examples of the encoder ring 12. The encoder ring 20 shown in FIG. 2A basically differs only in a part of the configuration of the joint between the encoder ring 12 and the magnetic encoder 14 in FIG. Description is omitted. The encoder ring 20 includes a support ring 13 formed in an annular shape, and a magnetic encoder 21 integrally joined to a side surface of the support ring 13 by vulcanization bonding or the like.

  In the present embodiment, in order to increase the fixing force, the magnetic encoder 21 wraps around from the inner side surface of the standing plate portion 13b of the support ring 13 to the outer edge, and turns around from the inner side surface of the standing plate portion 13b to the outer edge. The side surface 21a of the magnetic encoder 21 and the end surface 19 of the protrusion 13c are set substantially flush in the axial direction.

  The encoder ring 22 shown in (b) is basically different from the encoder ring 20 in (a) only in part of the configuration of the side surface 21a of the magnetic encoder 21, and the other parts are denoted by the same reference numerals and overlapped. The explanation given above is omitted. The encoder ring 22 includes a support ring 13 formed in an annular shape, and a magnetic encoder 23 integrally joined to a side surface of the support ring 13 by vulcanization bonding or the like.

  In this embodiment, in order to increase the fixing force, the magnetic encoder 23 wraps around from the inner side surface of the upright portion 13b to the outer edge and is integrally joined, and the side surface 23a of the magnetic encoder 23 has the protrusion 13c. From the end face 19 in the axial direction.

  The encoder ring 24 shown in (c) is composed of a support ring 25 formed in an annular shape, and a magnetic encoder 26 integrally joined to a side surface of the support ring 25 by vulcanization bonding or the like. The support ring 25 is formed from a ferritic stainless steel plate or a rust-prevented cold-rolled steel plate into a substantially L-shaped cross section by press working, and has a cylindrical fitting press-fitted into the outer peripheral surface of an inner ring (not shown). The joining portion 25a, the standing plate portion 25b extending radially outward from the fitting portion 25a, and the inner side end of the fitting portion 25a formed by overlapping the intersection of the fitting portion 25a and the standing plate portion 25b. The projection 25c is provided. The magnetic encoder 26 is integrally joined to the inner side surface of the standing plate portion 25b, and the side surface 26a of the magnetic encoder 26 and the end surface 19 of the protruding portion 25c are set substantially flush with each other in the axial direction.

  Next, a method for press-fitting the above-described encoder ring will be described with reference to FIGS. (A), (b) has shown the press-fitting method of the encoder ring 12 shown in FIG. As shown in (a), an annular press-fitting jig 27 is opposed to the projection 13c of the support ring 13 of the encoder ring 12 and the side surface 14a of the magnetic encoder 14. The pressing surface 27a of the press-fitting jig 27 is set to the thickness of the protruding portion 13c superposed in the radial direction so as not to interfere with the magnetic encoder 14. Then, as shown in (b), the inner ring 7 is pressed by a desired stroke in the axial direction with the pressing surface 27a of the press-fitting jig 27 in contact with the side surface 19 of the protruding portion 13c of the support ring 13. Is press-fitted and fixed to the outer peripheral surface.

  Here, since the protruding portion 13c of the support ring 13 is formed by overlapping the end of the fitting portion 13a, the side surface 19 is formed in an arc shape. Since the pressing surface 27a of the press-fitting jig 27 is brought into contact with the side surface 19 and pressed in the axial direction, the support ring 13 is not pressed in a twisted state as compared with the contact between the surfaces. The press-fit load is applied on the same straight line without eccentricity with the fitting surface, that is, the inner diameter surface of the fitting portion 13a of the support ring 13, and the deformation of the encoder ring 12 due to the press-fit is suppressed to prevent the detection accuracy from being lowered. A press fit method can be provided.

  Further, since the pressing surface 27a of the press-fitting jig 27 is formed so as not to interfere with the magnetic encoder 14, the risk of damage to the magnetic encoder 14 can be reduced by preventing a dent or the like due to pressing, and the rubber magnet at the time of pressing can be reduced. It is possible to prevent a decrease in positioning accuracy due to the elastic deformation of the substrate and improve reliability.

  3C and 3D show a method of press-fitting the encoder ring 24 shown in FIG. As shown in (c), an annular press-fitting jig 28 is opposed to the projection 25c of the support ring 25 of the encoder ring 24 and the side surface 26a of the magnetic encoder 26. The pressing surface 28a of the press-fitting jig 28 is set to have a thickness of the protruding portion 25c so as not to interfere with the magnetic encoder 26, and a recess 28b is formed in a portion facing the magnetic encoder 26. Then, as shown in (d), the inner ring 7 is pressed by a desired stroke in the axial direction with the pressing surface 28a of the press-fitting jig 28 in contact with the side surface 19 of the protruding portion 25c of the support ring 25. Is press-fitted and fixed to the outer peripheral surface.

  As a result, similarly to the above-described embodiment, a press-fit load is applied on the same straight line without eccentricity with the inner diameter surface of the fitting portion 25a of the support ring 15, which is a fitting surface of the encoder ring 24, and the deformation of the encoder ring 24 due to the press-fitting. To prevent a decrease in the detection accuracy, prevent a dent or the like caused by pressing the magnetic encoder 26, reduce the risk of damage, and prevent a decrease in the positioning accuracy due to elastic deformation of the rubber magnet at the time of pressing, thereby improving reliability. Can be improved.

  FIG. 5 shows a sealing device 29 provided with the encoder ring 24 shown in FIG. The sealing device 29 constitutes a so-called pack seal composed of a slinger 25 and an annular seal plate 30 which are arranged to face each other. Since the slinger 25 has basically the same configuration as the support ring 25 of the encoder ring 24 described above, the same reference numerals are given to the respective components and parts, and redundant description will be omitted.

  The seal plate 30 includes a metal core 31 attached to an outer member (not shown), and a seal member 32 integrally joined to the metal core 31 by vulcanization bonding or the like. The core metal 31 is formed from an austenitic stainless steel plate or a rust-proof cold-rolled steel plate into a substantially L-shaped cross section by press working, and has a cylindrical portion 31a press-fitted into the inner periphery of the end of the outer member. And an inner diameter portion 31b extending radially inward from the end of the cylindrical portion 31a.

  The seal member 32 is made of an elastic member such as NBR (acrylonitrile-butadiene rubber), and extends from the base portion 32a which is wound around and joined to the inner edge of the inner diameter portion 31b of the core metal 31 to the inner peripheral surface of the cylindrical portion 31a of the core metal 31. And joined over the cylindrical portion 31a. The seal member 32 includes a side lip 32b extending inclining radially outward from the base 32a, a dust lip 32c and a grease slip 32d formed in a forked shape on the inner diameter side of the side lip 32b. Then, the side lip 32b is slid in contact with the upright plate portion 25b of the slinger 25 with a predetermined axial direction shim, and the dust lip 32c and the grease slip 32d are brought into contact with the fitting portion 25a of the slinger 25 with a predetermined radial shim white. Is in sliding contact.

  Further, the outer diameter of the distal end portion of the cylindrical portion 31a of the cored bar 31 is reduced in diameter and formed thin, and the sealing member 32 is wrapped around and fixed so as to cover the outer surface of the distal end portion to form a packing portion 32e. A so-called half-metal structure in which the outer peripheral surface is elastically adhered to the inner periphery of the end of the outer member. Thereby, the airtightness of the fitting portion between the outer member and the core bar 31 can be improved.

  In the present embodiment, since the sealing member 32 includes the dust lip 32c and the grease slip 32d, and is slidably contacted with the fitting portion 25a of the slinger 25 with a predetermined radial direction shim, the tension force between the dust lip 32c and the grease slip 32d is provided. As a result, the sealing plate 30 and the slinger 25 can be assembled in advance and integrated, so that the assembling operation of the sealing device 29 can be simplified, and each lip of the sealing member 32 is not exposed and is prevented from being damaged during the process. Quality reliability can be improved.

  Further, a projection 32f protruding toward the outer side is formed integrally with the base 32a of the seal member 32. When the sealing device 29 is stacked and handled by the convex portion 32f, the convex portion 32f abuts against the magnetic encoder 26 of the lower sealing device 29 and the inner diameter portion of the magnetic encoder 26 and the core metal 31 of the upper sealing device 29. A gap is formed between the gap 31b. As a result, the attraction force of the magnetic encoder 26 on the metal core 31 due to the magnetic force becomes extremely small, the sealing devices 29 are smoothly separated from each other, and the combined sealing plate 30 and the slinger 25 are displaced or come off. Such a thing disappears.

  The material of the seal member 32 may be, for example, HNBR (hydrogenated acrylonitrile / butadiene rubber) or EPDM (ethylene propylene rubber) having excellent heat resistance, heat resistance, chemical resistance, etc., in addition to the exemplified NBR. ACM (polyacryl rubber), FKM (fluoro rubber), silicon rubber, or the like, which is excellent in water resistance, can be exemplified.

  Next, a method of press-fitting the sealing device 29 will be described with reference to FIGS. The press-fitting jig 33 has a recess 33c at a portion facing the magnetic encoder 26 so as not to interfere with the magnetic encoder 26. Then, the pressing surfaces 33a and 33b of the press-fitting jig 33 are opposed to the end surface of the packing portion 32e of the seal member 32 and the side surface 19 of the protruding portion 25c of the slinger 25, respectively, as shown in FIG. 33 is pressed against the outer member 34 and the inner ring 35 by pressing a desired stroke in the axial direction in a state of contacting the end face of the packing part 32 e of the seal member 32 with the side face 19 of the protrusion 25 c of the slinger 25. It is press-fitted and fixed in the opening formed between them.

  As a result, a press-fit load is applied on the same straight line without eccentricity with the inner diameter surface of the fitting portion 25a serving as a fitting surface of the slinger 25, thereby suppressing deformation of the slinger 25 due to press-fitting, preventing a decrease in detection accuracy, and preventing a decrease in the magnetic encoder. The risk of damage can be reduced by preventing a dent or the like due to the pressing of 26, and a decrease in positioning accuracy due to elastic deformation of the rubber magnet at the time of pressing can be prevented to improve reliability.

  Here, the end face of the packing portion 32e of the seal member 32 and the side face 19 of the protrusion 25c of the slinger 25 are set substantially flush. Thus, the pressing surfaces 33a and 33b of the press-fitting jig 33 can be formed to be flush with each other by grinding or the like, so that workability can be improved, dimensional accuracy can be improved, and positioning accuracy of the sealing device 29 can be improved. Can be done. When the end face of the packing portion 32e of the seal member 32 and the side surface 19 of the protrusion 25c of the slinger 25 are not set to be substantially flush, a recess 33c is formed in a portion of the press-fitting jig 33 facing the magnetic encoder 26. What is necessary is just to form, and what is necessary is just to set the press surface 33a, 33b to the level difference corresponding to each plane difference.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to these embodiments at all, but is merely an example, and may be variously modified without departing from the gist of the present invention. It goes without saying that the scope of the present invention is indicated by the description of the claims, and furthermore, the equivalent meaning described in the claims, and all the changes within the scope are described. Including.

  The method for press-fitting an encoder ring according to the present invention can be applied to an encoder ring for detecting a rotation speed of a wheel of an automobile or the like in which an encoder is integrally provided on a support ring formed by pressing from a steel plate.

Reference Signs List 1 hub wheel 1a, 7a inner rolling surface 1b small-diameter stepped portion 1c caulking portion 2 double row rolling bearing 3 inner member 4, 34 outer member 4a outer rolling surface 4b vehicle body mounting flange 5 rolling element 6 wheel mounting flange 6a Hub bolt 6b Base 7, 35 Inner ring 8 Cage 9, 10 Seal 11 Cover 12, 20, 22, 24 Encoder ring 13, 25 Support ring 13a, 25a Fitting portion 13b, 25b Standing plate portion 13c, 25c Projecting portion 14, 21, 23, 26 Magnetic encoders 14a, 21a, 23a, 26a Side surface 15 of magnetic encoder Cover body 16, 31 Core 17 Mounting part 17a Insertion part 18 Sensor unit 19 End faces 27, 28, 33 of protrusions Press-fitting jig 27a, 28a, 33a, 33b Pressing surfaces 28b, 33c of press-fitting jig Recess 29 of press-fitting jig Sealing device 30 Seal plate 31a Core metal cylinder 31b Inner diameter part 32 of core bar Seal member 32a Base 32b of seal member Side lip 32c Dustrip 32d Grease lip 32e Packing part 32f of seal member Convex part 51 of seal member Encoder ring 52 Support rings 52a, 56a Fitting part 52b Standing plate Parts 53, 65 Magnetic encoder 54 Inner ring 55 Outer member 55a End face 56 of outer member Protective cover 56b Flange 56c Bottom 57 Core bar 58 Detection part of rotation speed sensor 59 Rib 60, 67 Press-fit jig 61 Sealing device 62 Ring core Gold 62a Cylindrical core 62b Ring core 63 Slinger 63a Cylindrical slinger 63b Ring slinger 64 Ring seal member 66 Projection A Axial gap B between the projection and the side of the magnetic encoder B Outside ring metal Side C Tip of cylindrical slinger D Inner surface of annular cored bar

Claims (3)

In a press-fitting method of a sealing device equipped with an encoder ring that is mounted on a wheel bearing that rotatably supports a wheel with respect to a suspension device and detects a rotation speed of the wheel,
The sealing device includes an annular seal plate and an encoder ring that are arranged to face each other,
The seal plate, a metal core pressed into the inner peripheral surface of the outer member,
A side lip integrally joined to the core metal and extending inclining radially outward;
With a dust lip and a grease slip formed in a forked shape on the inner side of the side lip,
The encoder ring is mounted on the inner member of the wheel bearing, a support ring formed in an annular shape,
It is composed of an encoder whose characteristics alternate in the circumferential direction and change at equal intervals,
The support ring is formed from a steel plate into an L-shaped cross section, and a cylindrical fitting portion that is press-fitted to an outer peripheral surface of the inner member;
A standing plate portion extending radially outward from the fitting portion, and a protruding portion formed by overlapping an end of the fitting portion at an intersection of the standing plate portion and the fitting portion; Is formed into an L-shaped cross section as a whole,
The encoder is integrally joined to a side surface of the standing plate portion, and the encoder is constituted by a magnetic encoder in which magnetic powder is mixed in an elastomer and magnetic poles N and S are alternately magnetized in a circumferential direction. An annular press-fitting jig faces the projecting portion of the support ring and a side surface of the magnetic encoder, and a pressing surface of the press-fitting jig is set to a thickness of the projecting portion, and the press-fitting jig is attached to the encoder. In order not to interfere, a recess is formed in a portion facing the encoder, and the side lip is slidably contacted with an upright plate portion of a support ring of the encoder ring with an axial squeeze,
The dust lip and the grease slip are formed by a pack seal that is slidably contacted with a fitting portion of the support ring with a radial squeeze,
A press-fitting method for a sealing device, wherein a press-fitting jig is axially press-fitted in a state where a pressing surface of the press-fitting jig is in contact with an end face of the seal plate and a side face of a protruding portion of the support ring.   The press-fitting method for a sealing device according to claim 1, wherein an end surface of the seal plate and a side surface of the protrusion of the support ring are set substantially flush.   3. The press-fitting method for a sealing device according to claim 1, wherein a side surface of the projecting portion of the support ring is formed in an arc shape.

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