JPS5820454Y2 - Railroad vehicle axle device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an axle device for a railway vehicle that facilitates wheel milling, axle flaw detection, and bearing grease replenishment.

As shown in FIG. 1, in a conventional axle device for a railway vehicle, a front cover 3 is screwed into a threaded portion 2 provided at the end of an axle 1, and the front cover 3 covers an end surface 4 of the axle. Little pig 5 is bolt 6
A grease nipple 8 for replenishing grease into the double-row roller bearing T fixed to the axle 1 was fixed to the center of the small lid 5.

Incidentally, the outer circumferential surface of the wheel, which wears out during vehicle operation, is regularly milled, but in order to mill the wheel, it is necessary to expose the center hole 9 provided on the end surface 4 of the axle. In order to expose the part 9, it takes a lot of trouble to loosen the bolt 6 and remove the small lid 5.

In addition, inspection to determine whether or not cracks have occurred in the axle 1 is carried out regularly using ultrasonic flaw detection, but in order to perform axle flaw detection, the end face 4 of the axle must be fully exposed and the end face of the axle must be completely exposed. It is necessary to remove what protrudes outward in the axial direction from 4 for the purpose of the axle shaft flaw detection device, and in order to perform axle flaw detection, it is troublesome to remove the small lid 5 and the front lid 3.

Furthermore, since a grease nipple 8 is fixed to the center of the small lid 5, a grease flow passage 1 is used to supply grease into the double-row roller bearing γ during wheel milling or axle flaw detection.
0 is exposed, there is a risk that foreign matter such as chips may enter into the double row roller bearing 7.

The object of this invention is to provide an axle device for a railway vehicle that facilitates wheel milling, axle flaw detection, and bearing grease replenishment.

Next, an embodiment of this invention will be described based on the drawings.

In FIG. 2, the axle 21 includes a bearing fitting surface 22, a threaded portion 23 provided on the shaft end side from the bearing fitting surface 22, and a cylindrical shaft end portion 24 provided on the shaft end side from the threaded portion 23. The bearing fitting surface 22 is fitted with an inner ring 25 of the single roller bearing and a seal sliding ring 27 that abuts against a side surface 26 of the inner ring on the shaft end side.

The outer ring 28 of the double row roller bearing and the oil seal 29 fixed to the shaft end side are in sliding contact with the outer peripheral surface of the seal sliding ring 27, and the twisted threaded portion 23 has a front cover 31 that comes into contact with the seal sliding ring 27. are screwed together.

A small lid 32 disposed on the outer periphery of the cylindrical shaft end 24 is fixed to the front lid 31 with a bolt 33, and a key is provided as a convex portion 34 on this small lid 32.

The convex portion 34 engages with a concave portion 35 provided as a key groove in the spring screw portion 23, and rotation of the small lid 32 and the front lid 31 with respect to the axle 21 is suppressed.

The small lid 32 is provided with a cylindrical portion 39 having a circumferential groove 38 on its outer circumferential surface, and a cup-shaped lid 42 that covers the end surface 41 of the axle is fitted onto the outer circumferential surface of the cylindrical portion 39.

The lid 42 is made of an elastic material such as rubber or synthetic resin, and when the outer peripheral surface of the flange 42 is tightened with a band 43, a portion of the lid 42 bites into the circumferential groove 38, and the lid 42 is inserted into the cylindrical portion of the small lid. 39 is firmly fixed.

A grease nipple 44 is fixed to the small lid 32,
The grease nipple 44 communicates with a space 46 provided between the seal sliding ring 27 and the front lid 31 via a grease supply path 45 provided in the small lid 32 and the front lid 31.

The space 46 is a flow path 4 provided in the seal sliding ring 27.
It communicates with the inside of the bearing through the grease nipple 4.
Grease is replenished into the bearing from 4.

According to the axle device for a railway vehicle of this invention, the small lid 32 is disposed on the outer periphery of the cylindrical shaft end 24 provided on the axle 21, and the cylindrical portion 39 provided on the front 16Jh lid 32 has an end face 41 of the axle. Since the lid 42 covering the axle is fixed, when the lid 42 is removed, the center hole 48 provided in the end face 41 of the axle is exposed, and the wheel can be rolled without removing the small lid 32 and the front lid 31. Easy to cut.

Further, the small lid 32 is a cylindrical shaft end portion 24 provided on the axle 21.
small lid 32 and front lid 3.
1 does not protrude outward in the axial direction from the end surface 41 of the axle, and when the cover 42 is removed, the end surface 41 of the axle is completely exposed, so the axle can be detected by simply removing the cover 42.
Axle flaw detection can be easily and reliably detected.

Furthermore, a grease nipple 44 fixed to the small lid 32 is connected to a space 46 via a grease supply path 45 provided in the front lid 31.
Since the grease supply path 45, space 46, and flow path 47 leading from the grease nipple 44 into the bearing are not exposed when wheel milling and axle flaw detection are performed, the grease supply path 45, space 46, and flow path 47 are not exposed, and foreign matter such as chips does not enter the bearing. Don't invade.

Further, a circumferential groove 38 is provided on the outer peripheral surface of the cylindrical portion 39 of the front lid,
The lid 42 is made of an elastic material such as rubber or synthetic resin, and when the outer peripheral surface of the lid 42 fitted to the outer peripheral surface of the cylindrical portion 39 is tightened with a band 43 to fix the lid 42 to the cylindrical portion 39,
It is easy to attach and remove the lid 42 from the small lid 32, and wheel milling and axle flaw detection are facilitated.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional axle device for a railway vehicle, and FIG. 2 is a sectional view of an axle device for a railway vehicle showing an embodiment of this invention. In the figure, 21 is an axle, 22 is a bearing fitting surface, 23 is a spring screw part,
24 is a shaft end, 25 is an inner ring, 26 is a side surface of the inner ring on the shaft end side, 27 is a seal sliding ring, 28 is an outer ring, 29 is an oil seal, 31 is a front lid, 32 is a small lid, 34 is a convex portion ,3
5 is a recessed portion, 39 is a cylindrical portion, 41 is an end surface of the axle, 42 is a lid, 44 is a grease nipple, 45 is a grease supply path,
46 is a space, and 41 is a flow path.

Claims (2)

[Scope of utility model registration request] (1) The axle 21 includes a bearing fitting surface 22 and a threaded portion 23 provided on the shaft end side of the bearing fitting surface 22.
2 includes an inner ring 25 of a double row roller bearing and a side surface 2 on the shaft end side of the inner ring.
The oil seal 29 fixed to the outer ring 28 of the double row roller bearing is in sliding contact with the seal sliding ring 27, and the seal sliding ring 27 is fitted in the threaded portion 23. A small lid 32 having a convex portion 34 that engages with a recess 35 provided in the axle 21 is fixed to the front lid 31, and the seal sliding ring 27 and the front lid 31 are screwed together. In an axle device for a railway vehicle in which a space 46 provided between the small lid 3 and
A grease nipple 44 fixed to the front lid 31 communicates with the space 46 through a grease supply path 45 provided on the front lid 31, and the small lid 32 is arranged on the outer periphery of the cylindrical shaft end 24 provided on the axle 21. An axle device for a railway vehicle, characterized in that a lid 42 covering an end surface 41 of the axle is fixed to a cylindrical portion 39 provided on the small lid 32. (2) A circumferential groove 38 is provided on the outer peripheral surface of the cylindrical portion 39 of the small lid, and the lid 42 is made of an elastic material such as rubber or synthetic resin;
The axle device for a railway vehicle according to claim 1, wherein the lid 42 is fixed to the cylindrical portion 39 by tightening the outer peripheral surface of the lid 42 fitted to the outer peripheral surface of the cylindrical portion 39 with a band 43.