CZ215196A3 - Shoe braking device for a railway vehicle - Google Patents

Abstract

A shoe-type braking device for railway rolling stock designed for travel over networks with differing track gauges. Said braking device includes two shoes (7a, 7b) supported by each holder (8) and shaped to fit the outline of a wheel (4) used in another network; a shaft (10) parallel to the axis of an axle (3) on which at least a movable one of the shoes is slidable, said shaft being long enough to enable at least said movable shoe to be moved between two positions, i.e. an operative position in which it faces the wheel to which it is assigned, and a stand-by position in which it is sufficiently spaced from the previous position to prevent the path of the stand-by shoes from intersecting that of the wheels currently in use when the shoe assembly is being moved; and an assembly (11) for translationally locking at least the movable shoes in predetermined positions.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a jaw braking device for a railway vehicle intended to circulate in networks in which the track gauge is located.

BACKGROUND OF THE INVENTION

A conventional rail vehicle comprises a bogie carried by at least one axle, at the ends of which wheels are mounted spaced apart by a value determined according to the track gauge of a given network, below which a jaw braking device is installed, comprising for each wheel:

a linkage assembly and at least one pair of jaws located in substantially opposite zones of the wheel in such a way that during braking the linkage assembly controls the jaws so as to grip the wheel rim between each other.

In the classic embodiment, each of the jaws is supported by a support attached to the chassis by a suspension means allowing movement of the jaw in question in the same plane as the wheel.

The suspension means is usually formed by a suspension rod.

For the circulation of railway vehicles in railway networks whose track width is different, a simple replacement of an axle of a certain track by other axles adapted to a different track gauge is carried out.

This procedure is much less expensive than scrapping entire bogies or frames.

However, if the axle is replaced with another, the wheels are no longer in the same plane as the jaws, so braking is inoperative.

Several other problems are added to this problem.

The type of jaws used in one network is usually different from the type of jaws used in another network, and therefore it is not possible to envisage the use of one jaw that is laterally displaced along the track gauge.

Thus, two pairs of jaws are required; one works in one and the other in the other network.

In certain cases, the length difference between the two types of axles is sufficient to accommodate two chassis mounted on the chassis, but the wheel rims on which the jaws are pressed are clearly separated in axial positions along the axle axis, but the width of these rims, increased by the thickness of the wheel flanges, is such that the zones reserved for their passage are close to or overlapping directly, and at least may, when using one of the axles, if they were actuated _; at the same time both pairs of jaws, causing the pair of jaws not intended for the type of axle in question to come into contact with the outer edge of the wheel, if not merely due to play, and at least prevent the jaw belonging to the wheel under consideration pushed the wheel rim and allowed the braking action.

In view of the space available, it is not possible to envisage a second set of rods allowing independent control of both pairs of jaws.

One of the results that the invention seeks to achieve is. a braking device of the above type, solving said problems.

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SUMMARY OF THE INVENTION

The subject of the invention is a braking device which essentially consists of:

3- on each support two jaws, each adapted to the wheel profile used in a different net,

- a shaft parallel to the axle axis on which at least one of the jaws, the so-called mobile jaw, is slidably mounted, said shaft being long enough to allow at least 1 | movement of the mobile jaw between two positions, ie. _H active position in which it is located against the wheel, which is responsible, and called. parked position which is sufficiently distant from the previous .....- -

a position so that during operation of the jaw assembly the jaw path in the holding position does not cross with the wheels currently being used, and means for blocking at least the mobile jaws at predetermined positions against displacement.

BRIEF DESCRIPTION OF THE DRAWINGS FIG

The invention will be explained in more detail with reference to the accompanying drawings, which schematically show:

FIG. 1 is a partial side view of a railway vehicle; FIGS. 2 and 3 are a top view of the braking device according to the invention in two operating positions.

It can be seen in the drawing that, for circulation in two railway networks with a difference in track gauge, a railway vehicle 1 is used, on which means of interchangeability of axles are provided for adapting the track gauge of the network used. Ř

Each railway vehicle thus comprises a bogie 2 carried by at least one axle 3, at the ends of which wheels 4 are mounted spaced apart by a value determined according to the track gauge under which the jaw brake is installed.

---- device 5? Comprising, for each wheel, a linkage assembly and at least one pair of jaws 7a, 7b which are located in substantially opposite zones of the wheel in such a manner that during braking the linkage assembly controls the jaws to clamp the wheel rim between each other.

In a classic embodiment, each of the jaws 7a, 7b is supported by a support 8 attached to the chassis by suspension means 9, y allowing movement of the jaw in question in the same plane as the wheel.

The suspension means is usually realized by a suspension rod.

According to the invention, the braking device comprises:

- on each support two jaws 7a, 7b, each adapted to the wheel profile used in a different net,

- a shaft 10 parallel to the axis of the axle 3, on which at least one of the jaws, the so-called mobile jaw, is slidably supported, said shaft being long enough to allow for a | at least the movement of the mobile jaw between two positions, the so-called active position in which it is opposite the wheel to which it belongs and the so-called waiting position in which it is sufficiently distant from the previous position so that the jaw path is not crossed with just being used. , <

and * * v. , '

means for blocking at least the mobile jaws at predetermined positions against displacement.

The mobile jaws then comprise a translation guide means 12 on the shaft, for example an opening 12 provided in the support to which they are attached.

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According to the invention, the jaws which are located closest to the central axis of the railway vehicle are mobile.

In one embodiment (not shown), the locking means is formed by a pin shank which is inserted into a bore provided in the jaw support and in the shaft.

In a preferred embodiment of the invention, the locking means 11 is a stop 13 which:

on the one hand, the transverse dimension D, measured along the shaft axis, is substantially equal to the unoccupied shaft length, and

on the one hand, it is displaceably (translationally) movable along the shaft axis 14 so as to immobilize at least the mobile jaw in its positions, depending on whether the stop is placed on one ⁽ or the other side of the mobile jaw as a stop).

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Preferably both jaws are mobile and the stop 13 is formed by two individual stops 13a, 13b, the sum of which ...

the thickness is equal to the total thickness of the stop 13 so that according to. the position of the stops is the distance between the jaws and their position on the shaft such that there is no risk that the jaw that is not currently operating will cross with the wheel flange.

The position of the jaws was shown (Figs. 2 and 3), depending on whether one or the other axle is used.

This makes it possible to make optimum use of the space available for mounting the brake shoe.

Instead of being movably movable, the stop 13 in one embodiment variant (not shown) has a complementary shape to the mobile jaw in order to lock it in its positions.

The stop 13 is carried by a control rod 17 which is parallel to the shaft and rotationally movable.

Instead of hanging the jaw supports individually by means of a rod, the two supports are supported by one rod 18, the ends of which are rotatably guided and immobilized against displacement on the suspension bars which connect them to the chassis.

and.

Thus, by means of a set of stops and shaft length reduced by the intermediate profiles, the jaws are positioned in axial positions in such a way that there is no risk of accidental contact of the unused jaw with the wheel around the axle. ___— - —.....—--—-

Claims (6)

A jaw braking device for a railway vehicle intended to circulate in networks with different track gauge, comprising for each wheel a linkage system and at least one pair of jaws (7a, 7b) which are located in substantially opposite zones of the wheel in such a way that the braking system of the linkage controls the jaws so as to grip the wheel rim, with each jaw (7a, 7b) being supported by a support () attached to the chassis by a suspension means (9) allowing movement of the jaw in question in the same plane containing a wheel, characterized in that the braking device comprises: - on each support (8) two jaws (7a, 7b), each adapted to the wheel profile used in a different net, - a shaft (10) parallel to the axis of the axle (3) on which at least one of the jaws, the so-called mobile jaw, is slidably mounted, said shaft being long enough to allow at least movement of the mobile jaw between two positions; the active position in which it is opposite the wheel to which it belongs and the so-called holding position in which it is sufficiently distant from the previous position so that, while operating the jaw assembly, the jaw path in the holding position does not cross with the wheels in use; 11) blocking at least mobile jaws at predetermined relocation positions. Device according to claim 1, characterized in that the jaws which are closest to the central axis of the railway vehicle are mobile. Device according to claim 1, characterized in that the locking means are formed by a pin shank which is inserted into a bore provided in the jaw support and in the shaft. Device according to claim 1, characterized in that the locking means (11) is a stop (13) which: - on the one hand, a transverse dimension D, measured along the shaft axis, substantially equal to the unoccupied shaft length, and - on the one hand, it is movably movable along the shaft axis (14) in such a way as to immobilize at least the mobile jaw in its positions, depending on whether the stop is placed on either side of the mobile jaw as a stop. A device according to any one of the claims. 1 to 4, characterized in that the two jaws are mobile and the stop (13) is formed by two individual stops (13a, 13b), the sum of whose thicknesses being equal to the total thickness of the stop (13) such that between the jaws and their position on the shaft such that there is no risk that the jaw that is not currently operating will cross with the wheel flange. Device according to claim 4 or 5, characterized in that, instead of being movably movable, the stop (13) has a complementary shape to the mobile jaw in order to lock it in its positions. ____________________-..........— -s7. Device according to any one, characterized by being supported by a control means rod (), with a shaft and rotatably movable.