RU2281195C2 - Method of fastening replaceable protective cover plates on support surfaces of freight car bogie side frame - Google Patents

Abstract

FIELD: railway transport; repair of freight car bogies.

SUBSTANCE: according to proposed method, trough-like replaceable cover plate is arranged on support surface of axle-box aperture of side frame. Said cover plate is secured at cold state by means of two pairs of lugs. One of pairs of lugs is bent onto horizontal flange of frame H-section and the other, onto wall of frame through dummy holes provided on box section part. Said fastening can be done by stud passed through holes in vertical posts of replaceable protective cover plate and dummy holes in frame box section part. Gasket made of rubber or rubber-like material, 4-7 mm thick, is placed between support surface of side frame and replaceable protective cover plate. Gasket suits form of support surface of side frame and has dimensions on plan exceeding support surface by 10-25%. Gasket is compressed in direction of action of working loads. Protective cover plate is secured after compression of gasket.

EFFECT: prevention of displacement of protective cover plates relative to support surfaces of side frame, reduced vertical dynamic loads.

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Description

The invention relates to railway transport, in particular to the repair of trucks of freight cars.

There is a method of restoring the oversized surface of the side frame of a freight wagon trolley (Popov S.I., Kruglov V.M. RU 2211127 C2, 23 P 6/00, published on 08.27.2003, Bull. No. 24), in which the steel is replaceable protective the plate is fixed, in a state heated to forging temperature, by settling it with bending of the inlets to the side walls of the part, and at the transition section of the box section of the upper part belt into the I-beam, beyond the edges of the horizontal shelf.

The disadvantage of this method is the need to have special equipment for setting a steel removable lining and its removal.

There is a method of mounting removable protective linings of a trough-shaped form on the supporting surfaces of axlebox openings of the side frame in the cold state (prototype) (Popov S.I., Dushanina L.V. Non-flash-hole restoration of the bearing surfaces of the bearing parts of cars with staging of replaceable wear-resistant elements. - Yekaterinburg: Izd- in UrGUPS, 2003 - 102 pp. - p. 19, 25, 26, 27, 64, 65, 66).

With this method, the attachment of interchangeable protective pads is made by bending one pair of paws for a horizontal shelf in a section of an I-section and another pair of paws for a wall of a part through technological holes in a box section.

Also known is the type of attachment of similar interchangeable protective pads using a stud or bolt passed through the technological holes in the side frame in the box section.

However, the fastening of steel interchangeable protective pads in this way has the following disadvantages. In the cold state, it is fundamentally impossible to achieve a snug fit of interchangeable protective pads at the same time both to the supporting surface and to the side surfaces of the side frame. Since the covering surfaces of the trough-like removable protective pads are made with dimensions obviously exceeding in size the sizes of the covered surfaces of the side frame (within the manufacturing tolerance), each replaceable protective pad adjoins the side walls of the part with a gap. The loose fit of the replaceable protective pads to the vertical side walls of the side frame leads to the fact that, under the action of dynamic loads, the replaceable protective pads move relative to the supporting surfaces of the side frame (slab). The magnitude of the relative displacement of removable protective pads is greater, the greater the gap in the horizontal plane, between the vertical walls of the side frame and the vertical struts of removable protective pads.

These movements contribute to the appearance of cracks, chips, and their premature failure in removable protective linings.

The objective of the invention is the elimination of displacements (whimpering) of steel removable protective linings relative to the supporting surfaces of the side frame, reducing vertical dynamic loads.

This problem is solved by placing a gasket of rubber or rubber-like material, 4-7 mm thick, between the supporting surface of the side frame and a removable protective pad, which has the shape of the supporting surface of the side frame and the dimensions in terms of it exceeding it by 10-25%. Said gasket is compressed in the direction of action of the workloads, and the protective lining is secured after compression of the gasket.

The essence of the invention lies in the fact that the rubber gasket is 4-7 mm thick, repeating in terms of the shape of the supporting surface of the side frame, but with dimensions increased in width by 10-25%, laid between the supporting surface of the side frame and a removable protective pad, under the action of a vertical , evenly distributed load, deforms and fills the voids associated with the presence of gaps from the mismatch of the sizes of the removable protective pad and the side frame in the axle box opening. In this case, the protrusions from the irregularities of the worn supporting surface are pressed into the rubber gasket, and the troughs in the supporting surface are filled with rubber. In the loaded state, the replaceable protective pad is fixed to the side frame, while the rubber gasket is deformed further by the horizontal load that occurs when the removable protective pad is secured.

Thus, after fixing and removing the vertical load, the rubber gasket that fills all the voids remains in a compressed state and provides a stationary position of the removable protective pad relative to the side frame. In addition, the specified rubber gasket softens the dynamic loads acting on the side frame in the axle box opening.

The method of securing a replaceable protective pad on the supporting surface of the side frame of a freight car truck is illustrated in the drawings.

Figure 1 shows the axle box opening of the side frame with a fixed removable protective pad. In Fig.2 - the same in section along aa in Fig.1. In Fig.3 - the same in section along BB in Fig.1.

An example of the method

The side frame 1 of the truck of the freight car to be repaired with supporting surfaces worn out within the tolerance is stacked upward with axle openings on the rack. On one of the supporting surfaces 2 lay a rubber gasket 3 so that their longitudinal axis coincide. A removable protective pad 4 is placed on top of the rubber pad and is loaded with a vertical, evenly distributed load. In this case, the rubber gasket 3 deforms and fills the voids in the corners between the side walls of the supporting surface of the side frame and the vertical struts of the removable protective pad; the protrusions from the irregularities of the supporting surface are pressed into the rubber gasket, and the troughs are filled with rubber gaskets. In the loaded state, the replaceable protective pad 4 is fixed in this position on the supporting surface of the side frame.

With the option of attaching a removable protective pad with paws, the latter bend: one pair 5 - for the lower shelf of the I-beam (in the I-section) and another pair of legs 6 - for the edges of the technological holes (in the box section). Similarly, fix the replaceable protective pad on the supporting surface of another axle box opening.

With the option of attaching a removable protective pad with a stud or bolt, a stud or bolt is passed through the holes in the vertical posts of the removable protective pad and the technological holes in the side frame and wrap nuts (nut) until the vertical posts of the removable protective pad fit snugly against the walls of the side frame.

Using the proposed method allows you to:

- reduce the cost of restoration repair of the supporting surfaces of the side frames of the trucks of freight cars;

- improve the dynamics of the car and its impact on the upper structure of the railway track.

Claims (1)

A method of fixing removable protective pads on the supporting surfaces of the side frame of a freight car truck, comprising placing on the supporting surface of the axle box side of the side frame a trough-like removable protective pad and fixing it in the cold state using two pairs of legs, one of which is folded onto a horizontal shelf of a frame section having I-section, and the other to the wall of the frame through the technological holes provided on the box section, or with the help of a pin that is passed through the hole Rusty in the uprights of the removable protective cover and the aforementioned technological holes in the box section of the frame, characterized in that between the supporting surface of the side frame and the replaceable protective cover a gasket of rubber or rubber-like material 4-7 mm thick, which has the shape of the supporting surface of the side frame and the dimensions in the plan, exceeding it by 10-25%, the said gasket is compressed in the direction of action of the workloads, and the protective lining is fixed after the gasket is compressed.

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