JP3538487B2 - Resin insulated bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin insulated bearing used in a place where electrolytic corrosion due to leakage current is a problem, such as a railway vehicle and various industrial motors.

[0002]

2. Description of the Related Art For example, in a railway vehicle which runs using electric power such as an electric locomotive or an electric passenger train as a power source, a grounding collector for grounding a leakage current so that vehicle parts are not damaged by a current leaking from a motor. An electric device is provided between the vehicle body. However, for some reason, a slight leakage current may flow into the bearing supporting the axle. In this case, a spark may be generated between the rolling element of the bearing and the raceway surface due to the leakage current, which may cause electrolytic corrosion.

Conventionally, as a means for preventing such electrolytic corrosion of a bearing, a configuration in which an outer ring 11 is covered with a resin layer 12 which is an insulating material as shown in FIG. 2 is known. The resin layer 12 extends from the outer diameter surface 11 a of the outer race 11 to both end surfaces 1.
1b, circumferential grooves 11a1 and 11b1 are provided on the outer diameter surface 11a and the end surface 11b of the outer ring 11 to enhance the adhesion to the outer ring base material, as shown in FIG. The protrusions 12a and 12b on the attachment surface of the layer 12 are fitted into the circumferential grooves 11a1 and 11b1, respectively.

[0004]

As shown enlarged in FIG. 2 (b), a portion connecting the outer diameter surface 11a and the end surface 11b of the outer race 11 is usually provided with a chamfered portion 11c. . The chamfered portion 11c is often provided in an R shape. When any external force or impact acts on the portion of the resin layer 12 that covers the chamfered portion 11c, the chamfered portion 1
A crack (crack) of the resin layer 12 may occur at a boundary portion E between the outer diameter surface 11a and 1c. For example, the bearing may be inadvertently dropped at the time of carrying, assembling, or removing the bearing.
Cracking of the resin layer 12 has been experienced, for example, when the vehicle collides with the ground or the like, when the falling height is high, or when the collision partner is hard.

As described above, cracks in the resin layer 12 tend to occur at the boundary E between the chamfered portion 11c and the outer diameter surface 11a. This is because when an impact force or the like is applied to a portion of the resin layer 12 covering the chamfered portion 11c, particularly when the chamfered portion 11c has an R shape as shown in FIG. This is because it is easy to slip, and stress concentrates on the boundary portion E of the resin film 12 due to the slip.

The present invention is intended to effectively prevent the above-described cracks in the resin layer.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a resin-insulated bearing having a resin layer formed from an outer diameter surface to an end surface of an outer ring. Rutotomoni a recess, and a recess, the chamfered portion
A circumferential groove is formed on the outer diameter surface across the boundary between
In addition , the present invention provides a configuration in which the convex portion of the attachment surface of the resin layer is fitted into the concave portion and the circumferential groove , respectively .

The concave portion provided in the chamfered portion may have any shape of a circumferential groove, a cross groove, and a depression. In the circumferential groove,
Single-row grooves, double-row grooves (concentric grooves), and spiral grooves are included. The crossing groove is a groove formed by, for example, loret processing. The depression includes a hole having a bottom with a drill or the like, as well as a minute concave formed by surface treatment such as shot blasting or tumbling.

[0009]

FIG. 1 shows an embodiment in which the present invention is applied to a cylindrical roller bearing. The cylindrical roller bearing includes an outer ring 1, an inner ring 2, a plurality of cylindrical rollers 3 interposed between the inner and outer rings 1 and 2, a cage 4 for holding the cylindrical rollers 3 at equal circumferential intervals,
Further, the outer ring 1 is constituted by a resin layer 5 formed from the outer diameter surface 1a to both end surfaces 1b.

As shown in FIG. 1B in an enlarged manner (FIG. 1B shows only one end A of the outer ring 1, but the other end B has the same configuration), the outer diameter of the outer ring 1 is shown. Surface 1a and end surface 1b
Circumferential grooves 1a1 and 1b1 are formed in the end face 1b of the outer race 1
Two circumferential grooves 1c1 and 1c2 are formed concentrically in an R-shaped chamfered portion 1c connecting the outer peripheral surface 1a and the outer diameter surface 1a. The circumferential groove 1c1 is located substantially at the center of the chamfered portion 1c, and the circumferential groove 1c2 is located near a boundary portion E between the chamfered portion 1c and the outer diameter surface 1a. Further, in this embodiment, a circumferential groove 1a2 is formed on the outer diameter surface 1a with the boundary E between the circumferential groove 1c2. The depth of the circumferential grooves 1c1, 1c2, 1a2 is about 1 mm
The width is about 1 mm. Circumferential grooves 1a1, 1b1
Is slightly larger (about 1.2 mm) in both depth and width than the circumferential grooves 1c1, 1c2, 1a2.

The resin layer 5 is formed by injection molding (insert molding) using a synthetic resin such as polyphenylene sulfide resin (PPS), polyamide resin (PA: polyamide 66, polyamide 46, etc.), urethane resin, acrylic resin, epoxy resin and the like. ) Is integrally formed with the outer ring 1. A reinforcing material such as glass fiber may be blended with the PPS resin or the like for reinforcement.

At the time of molding, the molten resin is filled in the circumferential groove 1a of the outer race 1.
1, 1b1, 1c1, 1c2, 1a2 are filled, and convex portions 5a, 5b, 5c1, 5c2, 5
c3 is formed. And after the molten resin is solidified,
By fitting these convex portions into the circumferential grooves, the adhesion of the resin layer 5 to the outer ring base material is enhanced. In particular,
By fitting the convex portions 5c1 and 5c2 of the resin layer 5 into the circumferential grooves 1c1 and 1c2 of the chamfered portion 1c, even if some external force or impact force acts on the chamfered portion 1c,
Since the resin layer 5 is restrained against the outer ring base material and its slip is prevented, cracks are less likely to occur in the resin layer 5. Further, in this embodiment, a fitting structure is provided between the convex portion 5c2 and the circumferential groove 1c2, and between the convex portion 5c3 and the circumferential groove 1a2, with a boundary portion E where cracks in the resin layer 5 are likely to occur. Therefore, the occurrence of cracks is more effectively prevented.

[0013]

As described above, according to the present invention, co the Ru a recess in the joint Nag chamfer the outer surface and the end face of the outer ring
At the boundary between the concave portion, the chamfered portion and the outer diameter surface.
In a circumferential groove provided on the outer diameter surface, its convex portion of the attachment surface of the resin layer
Because it has a structure that is fitted into respectively the recess and the circumferential groove, even if some external force or impact force is applied to the chamfered portion,
Since the resin layer is constrained by the outer ring base material and is less likely to slip, cracks in the resin layer are effectively prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment (FIG. A) and an enlarged sectional view of a portion A (FIG. B).

FIG. 2 is a cross-sectional view showing a conventional configuration (FIG. A) and an enlarged cross-sectional view of a portion A (FIG. B).

[Explanation of symbols]

1 outer ring 1a Outer surface 1b End face 1c chamfer 1c1 Circumferential groove (recess) 1c2 Circumferential groove (recess) 5 Resin layer 5c1 convex 5c2 convex

Claims (2)

(57) [Claims] 1. A resin insulating bearing to form a resin layer from the outer diameter surface toward the end surface of the outer ring, when the outer passage and a circumferential surface and an end face Nag Ru a recess in the chamfered portion
In both cases, the boundary between the concave portion and the chamfered portion and the outer diameter surface is formed.
A resin insulated bearing, wherein a circumferential groove is provided on the outer diameter surface, and a convex portion of the attachment surface of the resin layer is fitted into the concave portion and the circumferential groove , respectively . 2. The resin insulated bearing according to claim 1, wherein the recess is one of a circumferential groove, a cross groove, and a depression.