JP2742690B2 - Lubrication system for sealed bearings for railway vehicles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for supplying grease to a sealed shaft tree of a railway vehicle.

(Prior art) Conventionally, as a lubricating device for a sealed bearing for a railway vehicle, a grease nipple is attached to a front lid as shown in Japanese Utility Model Publication No. Sho 53-10646, and an oil seal, a rear lid, and lubrication from the center of a bearing outer ring are used. Was.

The best lubrication position is from the center of the bearing outer ring,
Conventionally, a taper screw was formed at the center of the outer ring, and the plug was kept closed except when replenishing grease. When replenishing grease, the plug was removed and nipples were reattached to replenish.

(Problems to be Solved by the Invention) When grease is supplied from the center of the bearing outer ring, the work cannot be performed unless the axle box is removed if the bearing is inside the wheel. .

(Means for Solving the Problems) An object of the present invention is to make it possible to supply oil from the center of the outer ring of the bearing while the bearing is incorporated in the axle box even when the bearing is inside the wheel. A circumferential groove is provided on both or one of the opposing surfaces of the axle box and the outer ring, a through hole is formed in the axle box from outside the axle box to the circumferential groove, and grease is provided outside the through hole. Attach the nipple, radially form a through hole communicating with the gap between the outer ring and the inner ring from the circumferential groove in the outer ring, form an annular gap between the opposing surfaces near both sides of the circumferential groove, and at both ends of the circumferential groove An O-ring that comes into contact with the inner periphery of the axle box is mounted.

Hereinafter, a specific description will be given based on the illustrated embodiment.
Reference numeral 1 denotes a cylindrical axle box of a railway vehicle, and an outer ring 2 of a sealed bearing is fitted on an inner surface thereof. 3 is a roller, 4 is an inner ring, 5 is a wheel axle,
6 is a front lid, 7 is a rear lid, 8 and 9 are seals, and 10 is a belt. A circumferential groove 11 is provided at the center of the opposing surfaces of the axle box 1 and the outer ring 2, and a through-hole 12 communicating with the circumferential groove 11 from outside the axle box 1 is formed in the axle box 1.
A grease nipple 13 is attached to the outside of the through hole 12, and a plurality of through holes 15 are formed radially from the circumferential groove 11 to the gap 14 between the outer ring 2 and the inner ring 3. The circumferential groove
11 Annular gaps 16 and 17 are formed between the opposing surfaces near both sides, and O-rings 20 and 21 are attached to the concave grooves 18 and 19 at both ends to contact the inner periphery of the axle box and seal the annular gaps 16 and 17.

Next, the operation will be described. The grease in the grease nipple 13 flows into the circumferential groove 11 from the through hole 12 in a state where the bearing is incorporated without removing the axle box, and the circumferential groove 11
, And further enters through a radially formed through hole 15 into a gap 14 between the outer ring 2 and the inner ring 3 to be supplied into the bearing. Even if abrasion powder is generated from the outside due to contact slip between the outer peripheral surface of the outer ring 2 and the inner peripheral surface of the axle box 1, the O-rings 20 and 21 prevent the abrasion powder from entering the bearing.

(Effects) According to the present invention, an outer ring is fitted on the inner surface of the axle box, a circumferential groove is provided on both or one of the opposing surfaces of the axle box and the outer ring, and a through hole communicating from the outside of the axle box to the circumferential groove is provided. A grease nipple is attached to the outside of the through hole, and a through hole radially extending from the circumferential groove to the gap between the outer ring and the inner ring is formed in the outer ring radially. And O-rings that are in contact with the inner periphery of the axle box are attached to both ends of the circumferential groove. Therefore, even if the bearing is inside the wheel and the axle box cannot be removed, the Oil can be supplied from the center of the outer ring of the bearing as it is incorporated in the box, and even if abrasion powder is generated due to contact slip between the inner peripheral surface of the axle box and the outer peripheral surface of the outer ring, penetration into the bearing can be prevented.

[Brief description of the drawings]

 FIG. 1 is an upper half view of a front section of an embodiment of the present invention. 1 ... Axle box, 2 ... Outer ring, 3 ... Roller 4 ... Inner ring, 5 ... Wheel shaft, 11 ... Circumferential groove 12 ... Axle box through hole, 13 ... Grease nipple 14 ... Outer ring Cavity between inner rings, 15 ... Outer ring through holes 16,17 ... Circular gap near both sides of circumferential groove, 20,21 ... O-ring

Claims (1)

(57) [Claims] An outer ring is fitted on the inner surface of an axle box, and a circumferential groove is provided on both or one of the opposing surfaces of the axle box and the outer ring, and a through hole is formed in the axle box from the outside of the axle box to the circumferential groove. A grease nipple is attached to the outside of the through hole, a through hole radially extending from the circumferential groove to the gap between the outer ring and the inner ring is formed in the outer ring, and an annular gap is formed between the opposing surfaces on both sides of the circumferential groove. A lubricating device for a sealed bearing for a railway vehicle, wherein O-rings that are in contact with the inner periphery of the axle box are mounted at both ends of the circumferential groove.