JP2528570Y2 - Wheelset assembly for railway vehicles - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention does not require disassembly at the time of maintenance / inspection of railway vehicles or replacement of vehicles, and incorporates double-row tapered roller bearings for weight reduction. The present invention relates to a wheel set assembly for railway vehicles.

(Prior art) The tapered roller bearings incorporated in the wheelset assembly for railway vehicles are designed and manufactured with the intention of having a long life corresponding to the life of the vehicle. In principle, it is a principle that a disassembly inspection of the bearing itself is always performed.
For this reason, the inner and outer races are formed thick in the vehicle bearing in consideration of a long life. Furthermore, recently, sealed roller bearings have been adopted for railway vehicles, and the life of the bearings has been greatly improved. Therefore, the bearings must be removed until the vehicle inspection cycle (for example, 6 years or 800,000 km) is completed. Can be used for disassembly.

(Problems to be Solved by the Invention) However, turning or replacement of wheels may be required even during the vehicle inspection cycle due to problems such as ride comfort and noise. In this case, since normal roller bearings are manufactured for long life, the inner and outer races are thick, so the outer diameter, the outer diameter of the front lid, and the outer diameter of the rear lid are larger than the inner diameter of the wheels. Yes, the bearing must be disassembled one by one when removing the wheel, which is extremely inefficient.

In addition, since the bearing incorporated in the wheel set assembly for a railway vehicle has a large weight, the unsprung load becomes large and the rail is damaged.

(Means for Solving the Problems) This invention is designed so that the life of a roller bearing incorporated in a wheel set assembly for a railway vehicle can be sufficiently maintained until the vehicle is inspected at a predetermined cycle. In this case, it is intended to immediately replace the bearing with a new one. In addition, the present invention enables this without disassembling the bearing even when replacing the wheel other than during the periodic inspection.

In other words, in the present invention, the inner and outer rings of the tapered roller bearing incorporated in the wheel set for a railway vehicle are made thinner than conventional products, and the outer diameter is made smaller than the inner diameter of the wheel, thereby reducing the weight.
According to past inspection results, the outer circumference of the outer ring is coated with an insulating material or the seal is made of a conductive material based on the finding that electrolytic corrosion rather than peeling has a greater effect on the life of the bearing. It was done.

(Operation) Since the tapered roller bearing according to the present invention has an outer diameter smaller than the inner diameter of the wheel, it does not need to be disassembled when the wheel needs to be replaced or turned, that is, the wheel is mounted on the wheelset assembly. Can be removed. New or re-cut wheels can be installed immediately. Further, during the operation of the bearing, no electrolytic corrosion is observed at all, and the use can be continued without disassembling and checking for a preset life period.

(Example) Next, an example of this invention is described based on a drawing.
The drawings show a cross section of a wheel set for a railway vehicle according to the present invention.
The wheel 8 is mounted on the shaft end wheel boss seat 7, the outer ring 12, the inner ring
The thickness of 13a and 13b is thinner than the standard one. Therefore, the outer diameter Da of each of the bearing, the front lid, and the rear lid is formed smaller than the inner diameter D of the wheel 8 described above. Tapered rollers 14 are outer rings 12
Are rotatably disposed on tracks 15a, 15b formed on the inner peripheral surfaces of the inner rings 13a, 13b, and tracks 16a, 16b formed on the respective outer peripheral surfaces of the inner rings 13a, 13b. Reference numeral 17 denotes a retainer in which the above-mentioned tapered rollers are evenly arranged on a raceway.

The inner diameter 3a of the front lid 3 is fitted on the outer peripheral surface of the journal 6,
Further, the inner end surface 19 is in contact with the outer end surface 20 of the inner ring 13a. The rear cover 4 is fitted into the conical surface 6a of the journal 6 and the large-diameter surface 6b following the conical surface 6a, and the end surface 21 on the large-diameter surface side is a wall surface 22 extending from the large-diameter surface 6b of the journal to the wheel boss seat 7. , And the other end 23 is in contact with the outer end surface 24 of the inner ring 13b. The drainer 11 forming the end face 21 of the rear lid 4 is provided with a passage 25 for communicating the inside of the bearing with the outside of the bearing and an air breather 26 following the passage 25. Reference numeral 9 denotes an oil supply hole for supplying grease, and waste grease pushed out by grease supplied from the oil supply hole is retained in a grease reservoir 10 described later.

Further, the outer peripheral surface of the outer ring 12 is coated with a polyurethane rubber 5 which is an insulator to prevent electrolytic corrosion. Needless to say, an appropriate material such as nylon or FRP can be used for the insulator in addition to the above polyurethane rubber. In addition, appropriate means such as adhesion, injection molding, and winding can be used for coating.

The grease seal 2 is housed in a seal box 29 having an L-shaped cross section fitted to the inner surfaces 25a, 25b at both ends of the outer ring 12, and
The grease reservoir 10 is provided via the partition wall 27. The grease seal 2 is in contact with the outer peripheral surface 28 of the front lid 3 and the rear lid 4. When the journal 6 rotates, the grease seal 2 slides on the outer peripheral surface 28 to prevent foreign matter such as dust from entering from outside. .

Furthermore, instead of coating the insulator 5 on the outer peripheral surface of the bearing, a knitted copper wire is buried in acrylic rubber, nitrile rubber, or the like as a grease seal, or carbon is mixed to have conductivity to prevent electrolytic corrosion. .

(Effect) This invention is based on the idea that the outer diameter of the tapered roller bearing, the front lid, and the rear lid incorporated in the wheelset assembly for a railway vehicle as described above is made smaller than the inner diameter of the wheel. Since the insulator is coated or the grease seal is made of a conductive material, the weight of the bearing is reduced, the unsprung load of the vehicle is significantly reduced, high-speed running is possible, and maintenance of the track is possible. It can be extremely simplified, and can be replaced immediately with a new one without the need to disassemble the bearing at the time of periodic vehicle inspection, which can reduce the required personnel and equipment. Therefore, the desired life can be sufficiently maintained because the electrolytic corrosion which can be performed without disassembling the bearing and greatly affects the life of the bearing is prevented.

[Brief description of the drawings]

 The drawings are longitudinal side views of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Bearing, 2 ... Grease seal 3 ... Front cover 4, ... Rear cover 5 ... Coating, 6 ... Journal 7 ... Wheel boss seat, 12 ... Outer ring 13a, 13b ... Inner ring, 14 ... … Tapered roller D …… Inner diameter of wheel Da …… Outer diameter of bearing, front lid, rear lid

Claims (2)

(57) [Scope of request for utility model registration] 1. A wheel boss seat to which an inner diameter of a wheel is fitted, a small-diameter journal connected to the wheel boss seat, and a double-row tapered roller incorporated into the journal via a front lid and a rear lid. Bearings, and grease seals extending from the inner surfaces of both ends of the outer ring of the bearing to the respective cylindrical surfaces of the front lid and the rear lid and slidingly in contact therewith. A wheel axle assembly for a railway vehicle, characterized in that a bearing is covered with an insulating material. 2. A wheel boss seat to which the inner diameter of a wheel is fitted, a small-diameter journal connected to the wheel boss seat, and a double-row tapered roller incorporated in the journal via a front cover and a rear cover. Bearings, and grease seals extending from the inner surfaces of both ends of the outer ring of the bearing to the respective cylindrical surfaces of the front lid and the rear lid and slidingly in contact therewith. A wheelset assembly for a railway vehicle, wherein the grease seal is made of a conductive material.