JP2009216230A - Wheel bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive wheel bearing device for allowing the easy detection of the abnormal or deteriorated state of a bearing without the need for disassembling it or using a special device when inspecting a vehicle. <P>SOLUTION: The wheel bearing device 1 comprises an outward member 2 having a wheel mounting flange 2b integrally provided at the end outer periphery and a double-row outside rolling surface 2a formed at the inner periphery, a pair of inner rings 3 having inside rolling surfaces 3a formed at the outer peripheries, double-row tapered rollers 4 stored between both rolling surfaces via a cage 5, and seals 6, 7 mounted in an opening of an annular space formed between the outward member 2 and the inner ring 3. At the inner-side end outer periphery of the outward member 2, a step 10 is formed whose diameter is slightly smaller than the outer diameter. A sheet-shaped temperature indicating material 11 is pasted at the step 10, and on the rear surface of the step, an adhesive is applied. Thus, the deteriorated state of the bearing is visually and easily detected without disassembling it when inspecting the vehicle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing that requires temperature monitoring, and more particularly, to a bearing for an axle of a railway vehicle and a wheel bearing that rotatably supports a vehicle such as an automobile.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a rolling bearing. Generally, the rolling bearing has a desired bearing rigidity. A double-row angular contact ball bearing that exhibits durability against misalignment and has low rotational torque is often used from the viewpoint of improving fuel efficiency. On the other hand, double row tapered roller bearings are used in vehicles such as off-road cars and trucks that have a heavy vehicle body weight.

  Conventionally, in an axle bearing device of a railway vehicle and a wheel bearing device of an automobile or the like, a temperature sensor separate from the bearing is attached to the housing in which the bearing is incorporated in order to detect an abnormality in the bearing temperature, and the temperature of the surface of the housing is However, since it is a separate type temperature sensor, a mounting space is required, and the temperature of the bearing itself is not directly measured. As a solution to these problems, a bearing with a temperature sensor as shown in FIG. 9 is known.

  This bearing 50 is an outer ring rotating type bearing, an inner ring 51 which is a fixed ring is fitted and fixed to the outer periphery of an axle (not shown) or the like, and an outer ring 52 which is a rotating ring is a wheel (see FIG. Etc.) are fixed in the fitted state.

  The bearing 50 has a tapered roller 54 held by a cage 53 interposed between an inner ring 51 and an outer ring 52, and seal means 55 for sealing an annular space between the inner and outer rings 51, 52 is mounted at both ends. ing.

  As shown in FIG. 10, the sealing means 55 is composed of a sealing member 56 attached to the inner ring 51 and a sealing member 57 attached to the outer ring 52, and the temperature of the sealing member 56 on the inner ring 51 side which is a fixed ring is increased. A sensor 58 is provided. The seal member 56 includes a cored bar 58 that is externally fitted to the inner ring 51 and an elastic member 59 that is integrally fixed to the cored bar 58, and is a kind of oil seal.

  The temperature sensor 60 is provided in contact with the cored bar 58 of the seal member 56, and is fixed in an embedded state in the seal member 56 by integral molding of the elastic member 59 to the cored bar 58. The temperature sensor 60 is composed of a chip-type laminated thermistor, and the wiring 61 (FIG. 9) is drawn from a radial groove 62 provided in the width surface of the inner ring 51 through an axial groove 63 provided in the inner diameter surface of the inner ring 51. It is connected to a temperature abnormality determination means (not shown).

Since the temperature sensor 60 is integrated with the seal member 59 in this way, the bearing 50 is integrated with the temperature sensor 60, the number of parts of the bearing device is reduced, and maintenance such as bearing replacement is facilitated. A temperature that is relatively close to the temperature of the bearing itself can be measured, and the determination temperature of the temperature abnormality determination means can be easily set. Further, it is not necessary to provide a separate mounting space for the temperature sensor 60, and there is no possibility of being damaged by a foreign object such as a flying stone or generating an error signal for generating an abnormal signal.
JP 2002-130263 A

  However, in this conventional bearing 50, since the temperature sensor 60 is used for abnormality detection, it is necessary not only to increase the cost of the bearing 50 but also to provide temperature measurement equipment (temperature abnormality determining means) on the vehicle side. However, it cannot be easily used for a wheel bearing device of an automobile or the like. Also, in recent years, wheel bearing devices used for trucks and the like are often used as unitized wheel bearing devices, so that it is possible to easily detect deterioration of the bearing during vehicle inspection. However, in such a non-separated wheel bearing device, there has been a demand for a low-cost means that can easily and easily detect a bearing abnormality visually.

  The present invention has been made in view of such circumstances, and for a low-cost wheel that can easily detect an abnormality and a deterioration state of a bearing without disassembling and using a special device at the time of vehicle inspection. It aims at providing a bearing device.

  In order to achieve the object, the invention according to claim 1 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and an outer rolling surface of the double row on the outer periphery. An inner member in which a double row of inner rolling surfaces facing each other is formed, a double row of rolling elements housed between the rolling surfaces via a cage, and the outer member. In a wheel bearing device including a seal mounted in an opening of an annular space formed between the inner member and the outer member or the inner member, a temperature indicator is provided on an exposed outer surface of the outer member or the inner member. Yes.

  Thus, in the wheel bearing device of the first generation to the third generation structure, the temperature indicating material is provided on the exposed outer surface of the outer member or the inner member, so that the temperature of the bearing itself can be easily and It can be detected simply and accurately by visual inspection, and at the time of vehicle inspection, the deterioration state can be easily detected without disassembling the bearing, and maintenance such as bearing replacement is facilitated. Further, it is not necessary to provide a space for attaching the temperature indicating material separately, and it is not necessary to provide temperature abnormality determination means on the vehicle side, so that the cost can be reduced.

  In addition, as in the invention described in claim 2, a wheel mounting flange for mounting a wheel on the outer periphery of the outer member or a vehicle body mounting flange for mounting on a vehicle body is integrally provided, and the outer member On the outer periphery of the end portion, a step portion having a diameter slightly smaller than the outer diameter is formed, and the temperature indicating material is formed in a sheet shape in which an adhesive is applied to the back surface thereof, and the temperature indicating material is If it is affixed to the part, the affixing can be facilitated, and the temperature state of the outer member can be detected at a glance by the color change.

  According to a third aspect of the present invention, the inner member includes at least one inner ring having an inner race surface formed on the outer periphery and facing the outer race surface of the double row. If the chamfered portion is formed on the inner periphery of the end of the rim, and the temperature indicating material is affixed to the chamfered portion, it is blocked from the outside by the shoulder or washer of the mating member that contacts the inner ring. This eliminates the risk of damage and improves reliability.

  Preferably, if the chamfered portion is formed in a flat shape as in the invention described in claim 4, the temperature indicating material can be stuck in a close contact state, so that workability is improved.

  Further, if the temperature indicating material is formed in a fan shape as in the invention described in claim 5, the visibility is further improved, the determination work can be performed easily and accurately, and the reliability is improved.

  Further, if the temperature indicating material is a reversible / irreversible combination type as in the invention described in claim 6, it is possible to simultaneously check the rising temperature history of the bearing and the current temperature state.

  The wheel bearing device according to the present invention includes an outer member in which a double row outer rolling surface is integrally formed on an inner periphery, and a double row inner rolling that faces the outer rolling surface of the double row on an outer periphery. Formed between an inner member having a surface, a double-row rolling element housed between the rolling surfaces via a cage, and the outer member and the inner member. In the wheel bearing device having a seal attached to the opening of the annular space, the temperature indicating material is easily provided on the exposed outer surface of the outer member or the inner member. In addition, it can be easily and accurately detected visually, and the deterioration state can be easily detected without disassembling the bearing during vehicle inspection, and maintenance such as bearing replacement is facilitated. Further, it is not necessary to provide a space for attaching the temperature indicating material separately, and it is not necessary to provide temperature abnormality determination means on the vehicle side, so that the cost can be reduced.

  An outer member integrally having a wheel mounting flange for mounting a wheel on the outer periphery of the end, and an outer rolling surface of a double row integrally formed on the inner periphery, and an outer rolling surface of the double row on the outer periphery. A pair of inner rings formed with opposing inner rolling surfaces, a double row tapered roller housed between the both rolling surfaces via a cage, and formed between the outer member and the inner ring. In a wheel bearing device including a seal mounted in an opening of an annular space, a step portion having a diameter slightly smaller than an outer diameter is formed on an outer periphery of an inner side end of the outer member. At the same time, an adhesive is applied to the back surface of the stepped portion to form a sheet and a temperature indicating material is affixed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  The wheel bearing device 1 has a configuration called a second generation on the driven wheel side. An outer member 2 integrally having a wheel mounting flange 2b for mounting a wheel (not shown) at an end on the outer side, and having tapered double-row outer rolling surfaces 2a and 2a formed on the inner periphery. And a pair of inner rings (inner members) 3 and 3 in which a tapered inner rolling surface 3a opposite to the double row outer rolling surfaces 2a and 2a is formed on the outer periphery, and accommodated between both rolling surfaces The double-row tapered rollers 4 and 4 and a cage 5 that holds these tapered rollers 4 so as to roll freely, and the end surfaces of the pair of inner rings 3 and 3 on the small diameter side (front side) are butted together. The back-to-back type double row tapered roller bearing set in the state is configured. Further, seals 6 and 7 are attached to the opening of the annular space formed between the outer member 2 and the inner ring 3, and leakage of the lubricating grease sealed inside the bearing to the outside, rainwater and Foreign matter such as dust is prevented from entering the bearing.

  A large collar portion 3b is formed at the large-diameter side end of the inner raceway surface 3a of the inner ring 3 to guide the tapered roller 4, and the tapered roller 4 is dropped at the small-diameter side end of the inner raceway 3a. A small collar portion 3c is formed to prevent this. These inner rings 3 and 3 are connected in the axial direction by an annular connecting ring 8. That is, an annular groove 9 is formed on the inner peripheral surface of the end portion on the small diameter side, and a connecting ring 8 made of a steel plate and having a hardened surface is attached to the annular groove 9, and the inner rings 3 and 3 are firmly integrated without play. Has been.

  The outer member 2 is made of a high carbon chrome bearing steel such as SUJ2, or a structural alloy steel such as SCr420, and the inner ring 3 and the tapered roller 4 are made of a high carbon chrome bearing steel such as SUJ2. In the case of high carbon chromium bearing steel, the core is hardened in the range of 58 to 64 HRC by submerged quenching, and in the case of structural alloy steel, the surface is hardened in the range of 58 to 64 HRC by carburizing and quenching. On the other hand, the cage 5 is formed by injection molding a material containing an appropriate amount of reinforcing material such as GF (glass fiber) based on a thermoplastic synthetic resin such as PA (polyamide) 66.

  Here, as shown in an enlarged view in FIG. 2, a stepped portion 10 having a diameter slightly smaller than the outer diameter is formed on the outer periphery of the inner end of the outer member 2. The step portion 10 serves as a reference surface to which a shoe (not shown) that rotatably supports the outer member 2 is slidably contacted when the outer row rolling surfaces 2a and 2a of the double row are ground. And the temperature indicator 11 is affixed on this step part 10. FIG. The temperature indicating material 11 is in the form of a sheet, and since the adhesive is applied to the back surface, it can be attached easily. Further, the temperature state of the outer member 2 can be detected at a glance with a color change.

  The temperature indicating material 11 includes an irreversible type capable of confirming a past temperature state (rising temperature history) and a reversible / irreversible combination type capable of confirming a past temperature state and a current temperature state at the same time. Yes, it can cover a wide temperature range from 40 ° C to 240 ° C. In addition to the sheet-like temperature indicating material 11 used by being attached, for example, a paint type in which the temperature indicating material is applied to a predetermined portion may be used.

  Thus, in this embodiment, since the temperature indicating material 11 is directly attached to the outer periphery of the end of the outer member 2, the temperature of the bearing itself can be easily and accurately detected visually. In addition, since it is exposed and affixed to the outer surface of the bearing, the deterioration state can be easily detected without disassembling the bearing during vehicle inspection, and maintenance such as bearing replacement is facilitated. Further, it is not necessary to provide a separate mounting space for the temperature indicating material 11 and it is not necessary to provide a temperature abnormality determination means on the vehicle side, so that the cost can be reduced.

  FIG. 3 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, and FIG. 4 is an enlarged view of a main part of FIG. Note that this embodiment basically differs from the above-described embodiment only in the location where the temperature indicating material is applied, and other identical parts, parts, parts having the same function, and parts are denoted by the same reference numerals and overlapped. The description that was made is omitted.

  In this embodiment, the temperature indicating materials 13 and 13 are affixed to the chamfered portions 12 and 12 formed on the inner periphery of the large-diameter side end portions of the pair of inner rings 3 and 3. As shown in FIG. 4 in an enlarged manner, the temperature indicating material 13 is in the form of a sheet, is extremely thin, and has an adhesive applied to the back surface. Affixing can be easily performed, and since it is blocked from the outside by a shoulder portion or a washer of a shaft member (not shown) that abuts against the inner ring 3, there is no possibility that the foreign object such as stepping stones will be hit and damaged, and reliability is improved.

  FIG. 5 is a longitudinal sectional view showing a wheel bearing device according to the present invention, and FIG. 6 is an enlarged view of a main part of FIG. This embodiment basically differs from the second embodiment described above (FIG. 3) only in the shape of the chamfered portion of the inner ring, and other parts, parts having the same function or the same function. Are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, chamfered portions 14 and 14 having flat surfaces are formed on the inner circumferences of the large-diameter end portions of the pair of inner rings 3 ′ and 3 ′, and the temperature indicating materials 15 and 15 are attached to the chamfered portions 14 and 14. Has been. As shown in an enlarged view in FIG. 6, as in the above-described embodiment, since it is cut off from the outside, there is no risk of hitting and damaging foreign matter such as stepping stones, and the reliability is improved and the chamfered portion 14 is flat. Therefore, workability is improved because the temperature indicating material 15 can be attached in a close contact state.

  Further, as shown in FIG. 7, the temperature indicating material 15 is formed in a fan shape extending in the circumferential direction of the chamfered portion 14. Thereby, the visibility is further improved, the determination work can be performed easily and accurately, and the reliability is improved.

  FIG. 8 is a longitudinal sectional view showing a wheel bearing device according to the present invention. In addition, the same code | symbol is attached | subjected to the part and site | part which are the same site | parts, the same components, or the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  This wheel bearing device is for a driven wheel, and integrally has a vehicle body mounting flange 16b for mounting on a vehicle body (not shown) on the outer periphery, and a double row arc-shaped outer rolling surface 16a on the inner periphery. , 16a integrally formed with an outer member 16 and a wheel mounting flange 17 for attaching a wheel (not shown) at one end thereof, and the outer circumferential surfaces 16a, 16a of the double row on the outer periphery. Is pressed into one of the arc-shaped inner raceway surface 18a opposite to the inner raceway 18 and the hub wheel 18 formed with the small-diameter step portion 18b extending in the axial direction from the inner raceway surface 18a. And an inner member 20 composed of an inner ring 19 formed with the other arc-shaped inner rolling surface 19a facing the double row outer rolling surfaces 16a, 16a on the outer periphery, and is referred to as a third generation. The structure is made. Further, the inner ring 19 is axially formed with respect to the hub ring 18 in a state where a predetermined bearing preload is applied by a caulking portion 18c formed by plastically deforming an end portion of the small diameter step portion 18b radially outward. It is fixed. Hub bolts 17a for fixing the wheels are planted at equal intervals in the circumferential direction of the wheel mounting flanges 17.

  Between both rolling surfaces of the outer member 16 and the inner member 20, a double row of balls 22 is accommodated so as to roll freely through a cage 21. Further, seals 23 and 7 are attached to the opening portion of the annular space formed between the outer member 16 and the inner member 20, and leakage of the lubricating grease sealed inside the bearing to the outside and from the outside Foreign matter such as rainwater and dust is prevented from entering the bearing.

  The outer member 16 is made 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 16a and 16a have a surface hardness in the range of 58 to 64 HRC by induction hardening. A curing process is applied.

  The hub wheel 18 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes a base portion 17b of a wheel mounting flange 17 that serves as a seal land portion of an outer side seal 23 including an inner rolling surface 18a. To the small diameter step portion 18b, the surface hardness is set to a range of 58 to 64HRC by induction hardening. The caulking portion 18c is kept in the surface hardness after forging. As a result, the wear resistance of the seal land portion is improved, the strength and durability of the hub wheel 18 with respect to the moment load applied to the wheel mounting flange 17 is increased, and microcracks are generated when the caulking portion 18c is formed. Can be suppressed. On the other hand, the inner ring 19 and the ball 22 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core portion by quenching.

  Here, in this embodiment, the step part 24 formed in the outer periphery of the edge part of the outer side of the outer member 16 slightly smaller than an outer diameter is formed. The stepped portion 24 becomes a reference surface with which a shoe (not shown) that rotatably supports the outer member 16 is slidably contacted when the outer row rolling surfaces 16a, 16a of the double row are ground. The temperature indicating material 11 is affixed to the stepped portion 24. Since the temperature indicating material 11 is in the form of a sheet and the adhesive is applied to the back surface, it can be attached easily, and the temperature state of the outer member 16 can be detected at a glance by the color change. be able to. Further, since the temperature indicating material 11 is exposed and stuck on the outer surface of the bearing, even in this type of unitized non-separable wheel bearing device, the bearing is not disassembled during vehicle inspection. The deterioration state can be easily detected, and maintenance such as bearing replacement becomes easy.

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

  The wheel bearing device according to the present invention can be applied to a first-generation to third-generation wheel bearing device that rotatably supports a wheel.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view of FIG. It is the arrow view seen from the VII direction of FIG. It is a longitudinal cross-sectional view which shows 4th Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. It is a principal part enlarged view of FIG.

Explanation of symbols

1 ··············· Wheel bearing device 2, 16 ·········· Outer member 2a ······· Outside rolling surface 2b, 16b ··· .... Body mounting flanges 3, 3 ', 19 ... Inner rings 3a, 18a, 19a ... Inside rolling surface 3b ... Large collar part 3c ...・ ・ ・ ・ ・ Small 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Tapered roller 5, 21 ・ ・ ・ ・ ・ ・ ・ ・ Cage 6, 7, 23 ・ ・ ・ ・ ・ ・ Seal 8 ・ ・···················································································· 14 .... Chamfer 17 ... Wheel mounting flange 17a ... Hub bolt 17b ... Base 18 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 18b ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter Stepped portion 18c ·············································································· Ball 50 .... Bearing 51 ... Inner ring 52 ... Outer ring 53 ... Cage 54 ... · Tapered roller 55 ······ Sealing means 56, 57 ······· Seal member 58 ··· Core 59 .... Elastic member 60 ... Temperature sensor 61 ... Wiring 62 ... Radial groove 63 ... .... Axial grooves

Claims (6)

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery;
A double row rolling element housed in a freely rolling manner between the rolling surfaces via a cage;
In a wheel bearing device comprising a seal mounted in an opening of an annular space formed between the outer member and the inner member,
A wheel bearing device, wherein a temperature indicating material is provided on an exposed outer surface of the outer member or the inner member.   It has a wheel mounting flange for mounting a wheel on the outer periphery of the outer member or a vehicle body mounting flange for mounting on the vehicle body, and the outer periphery of the outer member has a slightly smaller diameter than the outer diameter. 2. The wheel according to claim 1, wherein the formed step portion is formed, the temperature indicating material is formed in a sheet shape in which an adhesive is applied to a back surface thereof, and the temperature indicating material is attached to the step portion. Bearing device.   The inner member includes at least one inner ring having an inner race surface formed on the outer circumference and facing the outer race surface of the double row, and a chamfered portion is formed on an inner circumference of an end portion of the inner ring. The wheel bearing device according to claim 1, wherein the temperature indicating material is attached to a portion.   The wheel bearing device according to claim 3, wherein the chamfered portion is formed flat.   The wheel bearing device according to claim 3 or 4, wherein the temperature indicating material is formed in a fan shape.   The wheel bearing device according to any one of claims 1 to 5, wherein the temperature indicating material is a reversible / irreversible combination type.

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