FI108014B - Swivel castor wheel control - Google Patents

Abstract

Wheel set guide of a bogie (1) which is equipped with helical springs (5) as primary springs, the guide and traction forces of the wheel sets being transmitted to the bogie (1) exclusively by means of the helical springs (5) arranged in pairs. <IMAGE>

Description

108014 Swivel castor wheel pair controller. - En gejd för boggies et hjulpar.

The invention relates to a pivoting wheel guide for a pair of pivoting wheels which is provided with helical springs acting as primary springs.

The wheelsets are usually controlled independently of the primary suspension by separate elements (e.g.

10 by tile guides), by the action of the guide elements and the primary spring, or by a corresponding primary spring, e.g. in the form of an elastic block layer spring or a rubber roller spring.

15 Rubber element springs tend to pack and cure under critical operating conditions, which can affect its operation in a manner that may endanger its use.

The object of the present invention is to eliminate the disadvantages of said separate elements or rubber element springs.

This object is solved by the features set forth in the characterizing part of claim 1. Further developments and preferred embodiments of the invention are set forth in the other claims.

According to the invention, it is arranged that the steering and traction forces of the wheelsets are transmitted to the swivel castor only by means of helical springs arranged in pairs.

30

In certain applications limited by the load on the wheelset, the speed and the profile pair of the wheel / rail profile pair, it has surprisingly been found that the individual control elements as well as the combined spring elements can be omitted.

The coil springs have lateral stiffness depending on the diameter and the structural height. Taking due account of this, the lateral constant of the coil spring can be selected such that both the guide forces and the tensile forces can be supported solely by the pairwise coiled springs.

5 The power level is low to medium wheel pair loads in the area, which allows approximately radial free wheel alignment during cornering.

Conveniently, the spring can be implemented such that the emergency guide pin required for the 10 damage events acts simultaneously as the end stop and lifting safety device.

Constructive coupling of the emergency guide pin and the spring washer is advantageous with the spring washer in turn connected to the pivot body or bearing housing, whereby a prestressed spring package can be realized in a simple manner, which can be easily installed or replaced.

20 The possibility of using such an element can be extended by appropriately realizing the distribution points of the spring package and its structural height so as to allow replacement of the conventional rubber elements.

The invention will now be further described by way of example with reference to the accompanying drawings, in which:

Figure 1 is a partial view of a swivel castor.

Figure 2 shows a helical spring with emergency guide pins.

FIG.

3, 108014

The primary spring structure is illustrated in Figure 2. The coil spring 5 is tensioned between two base plates 9 and 10, of which the lower base plate 9 is integral with the wheel pair bearing housing 8 and the upper base plate 10 is integral with the downwardly facing bracket 7 of the pivot. The coil spring 5 thus forms a solid unit with the wheel bearing housing 8, while the pivoting body on the primary suspension can move relative to the wheel pairs depending on its characteristics. For added safety, an emergency guide pin 6 is provided between the bracket 7 and the wheel bearing housing 8 10 along the central axis of the coil spring 5, which is tightly threaded with the wheel bearing housing 8 and provided with two adjustable end stops 11, 12 below, which limits the movement between the bogie frame and the wheel set on the emergency oh-15 pin. For this purpose, the emergency guide pin 6 is screwed firmly together with the lower base plate 9 into the wheel bearing housing 8 and extends from its upper end through the bore 14 to the upper base plate 10 with a clearance between the bore 14 and the emergency guide pin 6. above and below and having a larger diameter than the hole, wherein the bottom of the spherical upper base plate 10 acts as a counterpart 13.

'25

Claims (2)

1. Auxiliary pair control for a bogie, which bogie is provided with primary springs acting as primary springs (5), wherein the primary springs are always clamped between two base plates (9, 10) and the upper base plate (10) is joined to the bogie, before the primary spring is present. an emergency control pin (6) arranged along its central axis, which is attached to the base plate (9) and which extends with a radial clearance through a shark (14) arranged in the second base plate (10) and which pin is axially movable -This base plate (10) between end stops (11, 12), characterized in that the emergency control pin (6), together with the lower base plate in question, is screwed to the auxiliary bearing housing (8), that the upper base plate (10) is reasonably shaped and its bottom is provided with a shark (14), and the bottom of the upper base plate (10) provides a counter stop (13) for both end stops (11, 12). 20 2. A pair of controls according to claim 1, characterized in that the end stops (11, 12) are axially controllably arranged in the emergency control pin (6).