BRAKE CARRIER FOR UNDERCARRIAGE FRAMES OF RAIL VEHICLES

SUPPORT DE FREIN POUR DES CADRES DE CHASSIS DE VEHICULES FERROVIAIRES

English Abstract

A brake carrier for bogies of rail vehicles has an open cross-section
with flexible torsion. A connection to two longitudinal
members of the bogie is designed as a rigid non-articulated
connection and a breaking device is fixed to the brake carrier
in such a way that a line of action of braking forces runs
through the shear centre that lies outside the cross-section of
the brake carrier.

French Abstract

L'invention concerne un support de frein pour des cadres de châssis de véhicules ferroviaires, ce support de frein ayant une section transversale ouverte souple en torsion et le raccordement aux deux longerons du cadre de châssis étant réalisé sous forme d'assemblage rigide non articulé. Selon l'invention, le dispositif de freinage (6) est fixé sur le support de frein (3, 4) de sorte que la ligne d'action des forces de freinage passe par le centre de cisaillement (P) situé hors de la section transversale du support de frein (3, 4).

Claims

6
CLAIMS:
1. A brake carrier for undercarriage frames of rail
vehicles,
wherein the brake carrier has a torsionally soft,
open cross-section,
wherein an attachment to two longitudinal members of
an undercarriage frame is a rigid, non-articulated connection,
and
wherein a braking mechanism is secured to the brake
carrier such that a line of action of braking forces runs
through a shear center which is located outside the cross-
section of the brake carrier.
2. The brake carrier as claimed in claim 1, wherein the
brake carrier comprises an approximately C-shaped cross-
section.
3. The brake carrier as claimed in claim 1, wherein the
brake carrier comprises an approximately U-shaped cross-
section.
4. The brake carrier as claimed in claim 1, wherein the
brake carrier comprises an approximately T-shaped cross-
section.
5. The brake carrier as claimed in claim 1, wherein the
brake carrier comprises an approximately I-shaped cross-
section.

Description

cp, 02768429 2014-04-07
54106-1012
1
Brake carrier for undercarriage frames of rail vehicles
FIELD OF INVENTION
The invention relates to a brake carrier for undercarriage
frames of rail vehicles, wherein the brake carrier has a
torsionally soft, open cross-section and wherein the
attachment to the two longitudinal members of the
undercarriage frame is implemented as a rigid, non-articulated
connection.
BACKGROUND
Brake carriers are often inserted into the undercarriage frame
as transverse members in order to secure the braking
mechanisms in undercarriage frames for rail vehicles.
This causes the resulting braking torque to be transmitted
onto the undercarriage frame.
DE 14 55 189 Al discloses a rigid railroad vehicle bogie which
comprises C-shaped transverse members that consequently have a
torsionally soft and open cross-section.
DE 25 43 558 Al also discloses torsionally soft transverse
members having an open cross-section.
The weight of the undercarriage is increased due to the brake
carrier; furthermore, the introduction of the braking torque
leads to the undercarriage frame being subjected to
undesirable stresses.
SUMMARY
The object underlying some embodiments of the invention is to
disclose an improved solution for the break carrier.

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This object may be achieved according to some embodiment of the
invention by means of a brake carrier for undercarriage frames
of rail vehicles, wherein the brake carrier has a torsionally
soft, open cross-section and wherein the attachment to the two
longitudinal members of the undercarriage frame is implemented
as a rigid, non-articulated connection, with the braking
mechanism being secured to the break carrier in such a way that
the line of action of the braking forces runs through the shear
center which is located outside the cross-section of the break
carrier.
A twist-free shear force flexure of the carrier may be achieved
by means of the constructional measure described herein.
As a result the carrier can be constructed so as to be lighter
in weight. Furthermore, the undesirable stresses on the
undercarriage frame occurring due to the braking torque being
introduced into the undercarriage frame are reduced.
Advantageously, the brake carrier can have an approximately C-,
U-, T- or I-shaped cross-section.
According to one aspect of the present invention, there is
provided a brake carrier for undercarriage frames of rail
vehicles, wherein the brake carrier has a torsionally soft,
open cross-section, wherein an attachment to two longitudinal
members of an undercarriage frame is a rigid, non-articulated
connection, and wherein a braking mechanism is secured to the
brake carrier such that a line of action of braking forces runs
through a shear center which is located outside the cross-
section of the brake carrier.

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BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in more detail with reference to
exemplary embodiments shown in the figures, in which by way of
example:
Fig. 1 shows the arrangement of the brake carriers in an
undercarriage frame,
Fig. 2 shows the attachment of a brake carrier to a
longitudinal member of the undercarriage frame, and
Fig. 3 shows the arrangement of braking mechanism and brake
carrier in an undercarriage frame.

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DETAILED DESCRIPTION
The schematic representation according to Fig. 1 shows an
undercarriage frame having two longitudinal members 1,2, two
brake carriers 3,4 and a cross member.
As shown in Fig. 2, the brake carriers 3,4 are connected to
the longitudinal members 1,2 in a rigid and non-articulated
manner. This can be accomplished for example by means of a
welded joint.
The representation according to Fig. 3 shows a braking
- mechanism 6 with brake disk 5 which is connected by way of a
suspension link 7 to the brake carrier 3 having an
approximately C-shaped cross-section.
By means of the suspension link 7 secured to the back of the
C-shaped cross-section on the brake carrier 3 by way of an
articulated joint and a bolted fastening, the line of action
of the braking forces runs through the brake carrier's shear
center which is located in this position.
Owing to the open cross-section the brake carrier 3 is
torsionally soft, which means that it does not significantly
affect the suppleness of the undercarriage frame. As a result
the structural requirements in respect of the primary spring
stage of the undercarriage are accordingly also less
stringent.
Components under torsional stress having an open cross-section
such as having a C, U, T or I shape, for example, are
torsionally softer than components having a closed cross-
section such as tubes or components having a rectangular
cross-section and being substantially stiffer.

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By virtue of undercarriage frame and brake carrier being
structurally designed in such a way that the line of action of
the braking forces runs through the shear center which is
located outside the cross-section of the brake carrier,
torsion-free loading, i.e. a twist-free shear force flexure,
is achieved.
As a result the brake carrier according to the invention can
not only be built lighter in weight, but thanks to the spatial
separation of shear center and physical carrier also provides
advantages in relation to the structural design possibilities
of the undercarriage frame.

CA 02768429 2012-01-13
" PCT/EP2010/059620 / 2009P12120W0
List of reference signs
1, 2 Longitudinal members
3, 4 Brake carriers
5 Brake disk
6 Braking mechanism
7 Suspension link
Shear center

Representative Drawing