JPS6329649Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an effective insulating device for preventing electrical corrosion of railway vehicle bogie bearings.

In a type of railway vehicle in which the car body and bogie frame are not electrically insulated by a rubber bushing or the like, there is a problem in that electrical corrosion occurs in the bearing portion, significantly shortening the life of the bearing. Electric current flows in the following order: car body - bogie frame - truck - bearing - axle - rail, and it is thought that electrical corrosion of the bearing can be prevented by arranging electrical insulation means at any of the joints of the above members. , it is impractical to electrically insulate between the car body and bogie frame by interposing a rubber insulating material as the car is modified, and between the bearing and the axle and between the axle and the wheel, Since no practical insulating means that can maintain rotational accuracy has been found, it may be possible to interpose electrical insulating means between the bogie frame and the rack or between the rack and the bearing.

The following requirements are required for electrical insulation means interposed between the bogie frame and the rack or between the rack and the bearing.

(1) Do not involve modification of bearings, cranes, trolleys, etc. Or, it can be completed with very slight modification.

(2) Insulation means are inexpensive.

(3) The insulation performance can be maintained until the bearing is replaced.

(4) It can be easily replaced at the same time as replacing the bearings.

(5) Must be able to withstand large loads and impact loads during connection work, sharp turns, etc.

The present invention takes into consideration the above conditions, and the shape of the insulation means is significantly simpler when the electrical insulation means is interposed between the rack and the bearing, compared to when it is interposed between the bogie frame and the rack. It is preferable to place the bearing between the clutch and the bearing because it can accommodate the above-mentioned conditions more fully.

The insulating member used as an electrical insulating means in the present invention is made by baking and adhering a membrane member made of a rubber-like elastic material to both sides of a thin steel plate, and then coating the surface of this membrane member with graphite, mica, tetrafluoroethylene, etc. It is formed by coating it with a non-adhesive and low-friction material such as a resin material. The strength of the steel plate can withstand large loads or large impact forces, and the electrical insulation is provided by a film-like member made of rubber material. This prevents damage to the rubber membrane member due to adhesion or friction. If the membrane member is bonded to one side of the steel plate using a rubber material, it can exhibit electrical insulation ability, but if the other side is
Metal contact with the bearing outer ring or bearing outer ring causes wear oxidation (Fretting-oxidation), which is a phenomenon that reduces fatigue strength.
corrosion) is more likely to occur. Therefore, it is necessary to adhere rubber membrane members to both sides of the steel plate.
It is also effective in that it maintains its insulation properties even if it is damaged during handling, and it also prevents noise from coming into contact with either the crack or the outer ring of the bearing. It is. The thickness of the steel plate is desirably 0.1 mm or more from the viewpoint of load-bearing capacity, and 1 mm or less is appropriate from the viewpoint of suppressing the total thickness of the insulating member. Regarding the thickness of the membrane made of rubber-like elastic material, if it is made too thin, the electrical insulation will be unreliable, and if it is made too thick, flow failure will occur under heavy loads, so the thickness should be set at 0.05.
It is preferable to keep it within the range of mm to 1.0 mm.

Embodiments of the present invention will be described below based on the drawings. FIG. 1 shows a partially enlarged cross section of the insulating member of the present invention, in which a membrane member 2 made of a rubber-like elastic material is bonded to both sides of a steel plate 1 by baking, and the surface of the membrane member 2 has a non-adhesive, Coated with low friction coating 3. In FIGS. 2 and 3, an electrically insulating member 5 is inserted between the bearing outer ring 6 and the ring 7 to electrically insulate the bearing outer ring 6 and the ring 7.

Since the insulating device for a railway vehicle bogie bearing according to the present invention has the above-described structural requirements, the following effects are brought about. Since the electrical insulating member inserted between the clutch and the outer ring of the bearing has a plate shape, there is no need to make any modifications to the bearing, clutch, truck, etc., and the insulating member can be replaced extremely easily when replacing the bearing. In addition, the insulating member has a structure in which membrane members made of rubber-like elastic material are bonded to both surfaces of the steel plate, which reduces manufacturing costs and maintains sufficient insulation properties to withstand large loads. Not only this, but also the occurrence of oxidative wear (fretting-corrosion) of metal contact parts can be prevented. Furthermore, since the surface of the membrane member made of rubber material is covered with a non-adhesive, low-friction coating, the membrane member will not stick or friction with the surface of the clutch and bearing outer ring even when pressed with a large load. No damage is caused to the bearing, and sufficient insulation and strength can be maintained until the bearing is replaced.

[Brief explanation of the drawing]

Fig. 1 is a partially enlarged cross-sectional view showing an embodiment of an insulating member used in the insulating device for a railway vehicle bogie bearing of the present invention, Fig. 2 is a side sectional view showing an embodiment of the present invention, and Fig. 3 is FIG. 3 is a cross-sectional view taken in a direction perpendicular to the axis. DESCRIPTION OF SYMBOLS 1... Steel plate, 2... Membrane member, 3... Non-adhesive, low friction coating, 5... Electrical insulating member, 6...
...Bearing outer ring, 7...Kura.

Claims (1)

[Scope of utility model registration request] A plate-shaped electrical insulating member made by baking and adhering a membrane member 2 made of a rubber-like elastic material to both sides of a thin steel plate 1, and coating the surface of the membrane member 2 with a low-wear and non-adhesive coating 3. 5 inserted between a bearing outer ring 6 and a bearing 7.