JP2001349331A - Manufacturing method of rolling bearing device and accessory member for rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the durability of accessory members for rolling bearing such as a seal plate and a seal ring manufactured by sticking an elastic member made of nitrile butadiene rubber on a metallic core by a thermosetting adhesive and an encoder for detecting a rotation condition, against the alkali environment. SOLUTION: Thermosetting adhesive bonding the metallic core 14 constituting the seal ring 13 and the elastic member 15 mutually so as to prevent their separation is heated twice, namely, at the time of vulcanizing molding and secondary heating and is hardened. After heating the thermosetting adhesive by vulcanizing and molding the elastic member 15, while the thermosetting adhesive adheres to a part where the elastic member 15 is stuck to a surface of the core unit 14, it is heated secondarily. As a result, the thermosetting adhesive is sufficiently hardened, and adhesion is not easily reduced even in an alkali environment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A rolling bearing device according to the present invention is used for rotatably supporting a rotating member of various mechanical devices such as a wheel of an automobile or a main shaft of a machine tool.
In particular, the present invention relates to an auxiliary member formed by attaching an elastic material made of nitrile-butadiene rubber to a metal core, which is fixed to an outer ring-equivalent member or an inner ring-equivalent member constituting such a rolling bearing device, for example, The present invention has been invented to ensure durability of a seal ring, a rotation state detection encoder, and the like.

[0002]

2. Description of the Related Art Conventionally, rolling bearing devices having various structures have been used in order to rotatably support a rotating member such as a rotating shaft with respect to a fixed portion such as a housing constituting various mechanical devices. Further, such a rolling bearing device comprises an auxiliary member formed by attaching an elastic material made of synthetic rubber to a metal core, such as a seal ring and an encoder for detecting a rotation state, and constitutes the rolling bearing device. It is widely used to fix to an outer ring equivalent member or an inner ring equivalent member. As an example of a rolling bearing device to which the present invention is applied with such an attached member fixed thereto, a first example of an embodiment of the present invention will be described with reference to FIG.

FIG. 1 shows an example of a rolling bearing unit 1 for rotatably supporting a wheel of an automobile with respect to a suspension device as an example of a rolling bearing device to which the present invention is applied. An outer ring 2 corresponding to an outer ring-equivalent member described in claims that does not rotate in a state of being mounted on a vehicle and supported by a suspension device has double-row outer ring tracks 3, 3 formed on an inner peripheral surface. Then, the outer ring 2 is fitted to the end of the knuckle 4 constituting the suspension device in a state where axial displacement is prevented by a retaining ring 6 locked in a locking groove 5 formed in the inner peripheral surface of the end. It is fixed. A hub 7 corresponding to the inner ring-equivalent member described in the claims is provided inside the outer ring 2.
Are arranged concentrically with the outer ring 2.

[0004] The hub 7 comprises a hub body 8 and a pair of inner rings 9.
a and 9b. The outer end of the hub body 8 (the outer end is an end that is the widthwise outside of the vehicle when assembled to the vehicle, and is the left end in FIG. 1. On the contrary, the inner end is the vehicle when assembled to the vehicle. The right end in FIG. 1). A flange (not shown) for fixing a wheel (not shown) is provided on the outer peripheral surface of the portion, and a small-diameter step portion 10 is provided on the outer peripheral surface of the intermediate portion. Each is formed. And
The small-diameter step portion 10 has an inner raceway 1 on its outer peripheral surface.
The pair of inner rings 9a and 9b forming the first member 1 are externally fitted and fixed.

The outer raceways 3 and 3 and the inner raceway 1
A plurality of balls 12, 12, each of which corresponds to a rolling element described in the claims, are provided between the first and second rolling elements 11 and 11 so as to be rollable while being held by a retainer (not shown).
Although the balls 12 are used as rolling elements in the illustrated example, tapered rollers may be used as the rolling elements in the case of a heavy-duty rolling bearing unit for an automobile.

[0006] The outer end opening of the space in which the balls 12, 12 are installed is closed by a seal ring 13 corresponding to an attached member described in the claims. The seal ring 13 prevents the grease sealed in the space where the balls 12 and 12 are installed from leaking to the outside, or prevents various foreign substances such as rainwater and dust existing outside from entering the space. Prevent intrusion. Such a seal ring 13 is formed by press-forming a metal plate such as a steel plate to heat-harden an elastic material 15 such as an elastomer such as rubber on a metal core 14 having a substantially L-shaped cross section and a ring shape as a whole. It is adhered with a conductive adhesive. The seal ring 13 is fixed to the inner peripheral surface of the outer ring 2 by tightly fitting the core metal 14 on the inner peripheral surface of the outer end of the outer ring 2. The inner peripheral edge is in sliding contact with the outer peripheral surface of the outer end of the inner ring 9a. As the elastic material 15, nitrile butadiene rubber (NBR), which is a general synthetic rubber, is widely used. The nitrile butadiene rubber in the present specification includes hydrogenated nitrile butadiene rubber (H-N
BR).

In order to attach the elastic member 15 made of such nitrile-butadiene rubber to the metal core 14 as described above to form the seal ring 13, first, the elastic member 15 is formed. The core metal 14 coated with the thermosetting adhesive is set in the mold. Next, a material of nitrile-butadiene rubber constituting the elastic material 15 (a nitrile-butadiene rubber before vulcanization molding, and various kinds of compounding agents such as sulfur were mixed with various materials constituting the nitrile-butadiene rubber in this mold. Stuff). And
The elastic material 15 is vulcanized and formed in a state where the thermosetting adhesive is interposed between the elastic material 15 before the vulcanization molding and the core metal 14. The thermosetting adhesive is cured by heating when vulcanizing and forming such an elastic material 15,
The elastic member 15 and the metal core 14 are bonded to each other inseparably. Incidentally, a phenol-based adhesive is widely used as the thermosetting adhesive.

[0008]

In recent years, a housing (knuckle 4) and a shaft (hub body 8) for fixing an outer ring and an inner ring of a rolling bearing device are made of aluminum alloy or magnesium in order to reduce the weight. It is made with light alloys such as alloys. On the other hand, the outer race forming the outer raceway and the inner race forming the inner raceway are:
In order to secure the required rolling life and strength, it is made of steel such as bearing steel, carburized steel, or high carbon steel. For this reason, it is inevitable that the light alloy member and the steel member having different metal potentials are adjacent to each other around the rolling bearing device. Then, a conductive liquid (aqueous solution of an electrolyte) is applied between the light alloy member and the steel member at a portion where the light alloy member and the steel member having different metal potentials are adjacent to each other. If it adheres so as to cover, the conductive liquid becomes an electrolytic solution, and a battery is formed around the rolling bearing device.

For example, in the case of a rolling bearing unit 1 incorporated in an automobile as shown in FIG. 1, water containing sodium chloride (salt) contained in seawater near the shore and snow melting agent in a snow-covered area. Water containing sodium chloride, potassium chloride, or the like may adhere to the periphery of the rolling bearing unit 1. Then, water containing such an easily ionizable substance such as sodium chloride or potassium chloride is mixed with a metal core 14 constituting the steel outer ring 2 and the seal ring 13 and a light alloy, as indicated by a satin finish in FIG. When it adheres so as to cover the knuckle 4 made of water, the water containing the easily ionized substance becomes an electrolytic solution to constitute a battery. Then, a current flows as indicated by an arrow α in the same figure, and when the electrolysis proceeds in the electrolytic solution based on this current, the steel outer ring 2 and the metal core 1 serving as a cathode are formed.
Hydroxide ions are generated on the fourth side, and the periphery of the outer ring 2 and the metal core 14 (portion indicated by the oblique lattice in the figure) becomes alkaline.

However, in the case of the conventional rolling bearing device, no consideration is given to the fact that the surroundings of the rolling bearing device will be in an alkaline environment. For this reason, an attachment made by attaching an elastic material made of nitrile butadiene rubber to a metal core fixed to the outer ring equivalent member (outer ring 2) and the inner ring equivalent member (hub 7) constituting the rolling bearing device. When the surroundings of the members, for example, the seal ring and the encoder for detecting the rotation state, etc., are in an alkaline environment as described above, there is a possibility that they will be damaged early. That is, in the conventional accessory member, the elastic material and the core metal are inseparably bonded by a thermosetting adhesive, but the thermosetting adhesive is heated during vulcanization molding of the elastic material. Only cured. However, phenolic adhesives, which are generally used as thermosetting adhesives, do not sufficiently cure only by heating during such vulcanization molding, and have sufficient durability in an alkaline environment. Cannot be secured. As a result, when used in the above-described alkaline environment for a long period of time, the adhesive strength of the thermosetting adhesive may be reduced or lost, and the elastic material may peel off from the core metal. is there.

When a synthetic rubber having poor moldability, for example, acrylic rubber, is used as the elastic material, the thermosetting adhesive is heated twice because vulcanization molding is performed twice. For this reason, the thermosetting adhesive is sufficiently cured, and the durability in an alkaline environment is improved. However,
The purpose of performing the vulcanization molding in two steps is to ensure the moldability of the synthetic rubber such as the acrylic rubber, but not to ensure the durability of the thermosetting adhesive to an alkaline environment. In addition, when acrylic rubber is used as the elastic material, the cost is unavoidably increased as compared with the case where nitrile butadiene rubber is used. The manufacturing method of the rolling bearing device and the accessory member for the rolling bearing device of the present invention has been invented in view of the above-mentioned circumstances.

[0012]

A rolling bearing device according to the present invention comprises a member corresponding to an outer ring having an outer raceway on an inner peripheral surface and an inner raceway on an outer peripheral surface, similarly to a rolling bearing device widely used in the past. And a plurality of rolling elements rotatably provided between the outer raceway and the inner raceway. Then, an attached member formed by attaching an elastic material made of nitrile-butadiene rubber to a metal core with a thermosetting adhesive is fixed to the above-described member corresponding to the outer ring or the member corresponding to the inner ring. In addition, as this attached member,
For example, a seal ring, a rotation state detection encoder, and the like can be given. In particular, in the rolling bearing device of the present invention, the elastic material is vulcanized and formed in a state in which a thermosetting adhesive is adhered to a portion of the surface of the core metal where the elastic material is to be attached. By performing the next heating, the thermosetting adhesive is further hardened to improve the resistance of the thermosetting adhesive to an alkaline environment.

Further, a method of manufacturing an accessory member for a rolling bearing device according to the present invention is characterized in that an elastic material made of nitrile-butadiene rubber is attached to a metal core with a thermosetting adhesive, and the rolling bearing device is manufactured. A method of manufacturing an auxiliary member for a rolling bearing device to be fixed to an outer ring-equivalent member or an inner ring-equivalent member to constitute, in order to attach the elastic material to the core metal,
After the elastic material is vulcanized and formed in a state where the thermosetting adhesive is adhered to the portion where the elastic material is to be attached on the surface of the core metal, the thermosetting adhesive is subjected to secondary heating. Is further cured.

[0014]

In the case of the rolling bearing device of the present invention incorporating the accessory member manufactured by the above-described method for manufacturing the accessory member for a rolling bearing device of the present invention, the core metal and the elastic material constituting the accessory member are combined. A thermosetting adhesive that adheres inseparably,
Has resistance to alkaline environment. That is, the elastic material is vulcanized and formed in a state where the thermosetting adhesive is adhered to the portion of the core metal to which the elastic material is to be attached, and then subjected to secondary heating to thereby obtain the thermosetting adhesive. The agent is sufficiently cured to improve durability against an alkaline environment.
As a result, a conductive liquid (aqueous solution of electrolyte) adheres to a portion where a light alloy member and a steel member having different metal potentials are adjacent to each other, and electrolysis proceeds in the conductive liquid. Accordingly, even if the surroundings of the accessory member become an alkaline environment, the adhesive strength of the thermosetting adhesive does not suddenly decrease. Therefore, even if the accessory member is used for a long time in such an alkaline environment, the elastic material and the core metal are not separated, and the performance of the accessory member can be sufficiently exhibited.

[0015]

FIG. 1 shows a first embodiment of the present invention, in which the present invention is applied to a rolling bearing unit 1 for rotatably supporting wheels of an automobile with respect to a suspension device. The case is shown. The basic configuration of the rolling bearing unit 1 is the same as that described above with reference to FIG. 1 as an example of the rolling bearing device to which the present invention is applied. Hereinafter, the description will focus on the features of the present invention.

A seal ring 13 corresponding to an attached member described above is fixedly fitted to the inner peripheral surface of the outer end of the outer race 2 constituting the rolling bearing unit 1 by interference fitting. The seal ring 13 is formed by pressing a metal plate such as a steel plate or the like to attach a resilient material 15 made of nitrile butadiene rubber to a metal core 14 having a substantially L-shaped cross section and an entire ring shape. These core metal 14 and elastic material 15
Is a thermosetting adhesive such as a phenolic adhesive,
They are inseparably bonded to each other. Further, the thermosetting adhesive is formed by vulcanizing the elastic material 15 in a state where the thermosetting adhesive is adhered to a portion of the core metal 14 to which the elastic material 15 is to be attached, By curing by secondary heating, resistance to an alkaline environment is improved.

That is, such a seal ring 13 is manufactured as follows. First, the core metal 14 to which the thermosetting adhesive is adhered is set in a mold for molding the elastic material 15. Next, a material of nitrile-butadiene rubber constituting the elastic material 15 (a nitrile-butadiene rubber before vulcanization molding, and various kinds of compounding agents such as sulfur were mixed with various materials constituting the nitrile-butadiene rubber in this mold. Stuff). Then, the elastic material 15 is vulcanized and formed in a state where the thermosetting adhesive is interposed between the elastic material 15 before the vulcanization molding and the core metal 14. Then, in order to further cure the thermosetting adhesive cured by heating during the vulcanization molding, the seal ring after the vulcanization molding is heated again (secondary heating).

In the case of the above-described rolling bearing device (rolling bearing unit) 1 incorporating the accessory member (seal ring) 13 produced by the above-described method for manufacturing the rolling bearing device accessory member of the present invention, The thermosetting adhesive which inseparably bonds the core metal 14 and the elastic material 15 constituting the accessory member 13 has excellent resistance to an alkaline environment. That is, in a state where the thermosetting adhesive is interposed between the cored bar 14 and the elastic material 15, the thermosetting adhesive is heated twice during vulcanization molding and during secondary heating. This thermosetting adhesive is sufficiently cured to ensure durability against an alkaline environment. As a result, water containing sodium chloride, potassium chloride, or the like is filled in a portion adjacent to the light alloy knuckle 4 having a different metal potential and the steel outer ring 2 or the metal core 14 as shown in FIG. Adheres to
As described in the problem to be solved by the above-mentioned invention, even if the portion indicated by the diagonal grid in the figure becomes an alkaline environment, the adhesive force of the thermosetting adhesive does not suddenly decrease. Therefore, even if the accessory member 13 is used for a long period of time in this alkaline environment, the elastic member 15 and the core metal 14 are not separated, and the performance of the accessory member 13 can be sufficiently exhibited.

This embodiment shows an example in which the present invention is applied to a rolling bearing unit for rotatably supporting a wheel of an automobile with respect to a suspension device. However, a rolling bearing unit as shown in FIG. It is not limited to one. For example, rolling bearing units of various structures, such as a rolling bearing unit having a structure in which one inner ring raceway of a double row of inner ring raceways is formed directly on a hub, and a wheel driving bearing unit for rotating a driving wheel. Applicable. Further, the present invention can be applied not only to such a rolling bearing unit but also to various rolling bearing devices such as a rolling bearing with a seal plate incorporated in various machine devices such as machine tools.

FIG. 2 shows a second embodiment of the present invention.
As an example, the present invention is applied to a rolling bearing unit 16 with a rotation state detection encoder in which a rotation state detection encoder for detecting a wheel rotation speed or the like is attached to the rolling bearing unit 1 shown in FIG. 1 described above. An example is shown. An encoder 17 corresponding to an accessory member described in the same claim is also provided at a portion closer to an outer end (left end in FIG. 2) of the hub 7 corresponding to an inner ring-equivalent member constituting the rolling bearing unit 16 with the encoder for detecting a rotation state. The outer fitting is fixed by interference fitting.

The encoder 17 is formed by pressing a metal plate such as a steel plate into a metal core 18 having a substantially L-shaped cross section and a ring shape as a whole. A permanent magnet 19, which corresponds to the elastic material described in the claims, is attached. This permanent magnet 19 is magnetized in the axial direction (left-right direction in FIG. 2),
The magnetization directions are changed alternately in the circumferential direction and at equal intervals from each other. Therefore, S poles and N poles are alternately arranged at equal intervals on the axial side surface of the permanent magnet 19. The core 18 and the permanent magnet 19 are inseparably bonded to each other by a thermosetting adhesive such as a phenolic adhesive. Then, this thermosetting adhesive is used in a state where the thermosetting adhesive is interposed between the cored bar 18 and the permanent magnet 19 at the time of vulcanization molding of the permanent magnet 19 and during the secondary heating. By curing by heating twice, resistance to an alkaline environment is imparted. Therefore, the hub 7 to which the encoder 17 is externally fitted is made of a light alloy, or the encoder 17 and the knuckle 4 made of a light alloy are close to each other. A battery is formed between the gold 18 and an adjacent member made of light alloy,
Even if the core 18 becomes alkaline, the core 1
8 can be effectively prevented from being separated from the permanent magnet 19.

When the rolling bearing unit 16 with the encoder for detecting the rotation state to which the encoder 17 is attached is used, the detection unit of the sensor (not shown) is connected to the encoder 1.
7 is made to closely approach the side surface in the axial direction of the permanent magnet 19. In this state, wheels (not shown) fixed to the hub 7 rotate, and the encoder 17 supported by the hub 7 rotates.
Rotates, the vicinity of the detection unit of the sensor is placed on the side surface of the permanent magnet 19 constituting the encoder 17.
The pole and the north pole pass alternately. As a result, the output of the detection unit of the sensor changes. Since the frequency of such an output change is proportional to the rotation speed of the encoder 17, if the output of this sensor is sent to a controller (not shown), the antilock brake system (ABS) and the traction control system (TCS) can be properly controlled. Can control. Other structures and operations are the same as those of the first example described above.

[0023]

According to the present invention, since the present invention is constructed and operated as described above, an attached member composed of a cored bar and an elastic material, such as a seal ring and an encoder for detecting a rotational state, can be used for a long time in an alkaline environment. Even when used over time, the performance of the attached member can be sufficiently exhibited, and a rolling bearing device having excellent durability can be provided.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a half sectional view showing the second example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rolling bearing unit 2 Outer ring 3 Outer ring track 4 Knuckle 5 Locking groove 6 Retaining ring 7 Hub 8 Hub body 9a, 9b Inner ring 10 Small diameter step portion 11 Inner ring track 12 Ball 13 Seal ring 14 Core metal 15 Elastic material 16 For rotation state detection Rolling bearing unit with encoder 17 Encoder 18 Metal core 19 Permanent magnet

Claims (2)

[Claims] 1. An outer race-equivalent member having an outer raceway on an inner peripheral surface, an inner race-equivalent member having an inner raceway on an outer peripheral surface, and a plurality of rollers provided rotatably between the outer raceway and the inner raceway. A rolling bearing device comprising: a rolling element; and an attached member formed by attaching an elastic material made of nitrile-butadiene rubber to a metal core with a thermosetting adhesive, to the outer ring-equivalent member or the inner ring-equivalent member. The vulcanization molding of the elastic material in a state in which a thermosetting adhesive is adhered to a portion of the core metal to which the elastic material is to be attached, followed by secondary heating to perform the thermosetting. A rolling bearing device characterized in that the thermosetting adhesive is further cured to improve the resistance of the thermosetting adhesive to an alkaline environment. 2. A rolling bearing which is formed by attaching an elastic material made of nitrile-butadiene rubber to a metal core bar with a thermosetting adhesive, and which is fixed to a member corresponding to an outer ring or an inner ring constituting a rolling bearing device. A method of manufacturing an accessory for an apparatus, in which a thermosetting adhesive is attached to a portion of the surface of the metal core to which the elastic material is to be attached in order to attach the elastic material to the core metal. And a method of manufacturing an auxiliary member for a rolling bearing device, in which the thermosetting adhesive is further cured by performing secondary heating after vulcanizing and molding the elastic material.