FR2646134A1 - BOGIE HAS TWO AXLES ORIENTABLE, MOUNTED SWIVEL UNDER A BODY OF A RAILWAY VEHICLE - Google Patents

Abstract

The present invention relates to a bogie with two orientable axles, mounted pivotably under a body of a rail vehicle, comprising a frame (1, 10, 2) connected to each axle via two axle boxes (8) and via a primary suspension (9), two articulated devices (30, 31, 32) each connecting the two axle boxes (8) situated on the same side of the frame, and a control device for the two articulated devices, characterised in that the control device comprises at least one actuator (34) controlled by a data sensor/emitter (41, 42) unit, the sensor (41) being situated on board the bogie and the emitter (42) being placed in a fixed location at the beginning of a curve in the track. Application to all rail vehicles.

Description

2646134 -

  Two-axle Bogie swiveling under a body

of a railway vehicle.

  The present invention relates to a bogie with two steerable axles, pivotally mounted under a body of a railway vehicle, comprising a chassis connected to each axle by means of two axle boxes and a primary suspension, two articulated devices connecting each the two axle boots located on the same side

  of the chassis, and a control device of the two articulated devices.

  FIG. 7 of FR-2.510.962 discloses such a bogie whose two articulated devices are controlled by the rotation of the body around the central vertical axis of the bogie. The control device is therefore installed on the pivoting ring, between box and frame, and it comprises two levers

  which act on the two articulated devices.

  This fully mechanical control device does not transmit significant forces to orient the axle, and it is then necessary to set up between the chassis and

  axle boots, a primary suspension with low stiffness.

  Although the stiffness of the suspension is low, the critical speed of stability in alignment is nevertheless quite high

  because the two articulated devices ensure a role of stability.

  But, in the case of a failure of an articulated device or its control device, the low stiffness of the suspension

  primary requires a low critical speed.

  To obtain a critical critical speed, therefore a stable bogie at high speed, it is necessary to increase the stiffness of the primary suspension but also to set up a control device capable of

to deform this suspension.

  To achieve this goal, the present invention proposes to remove the two horizontal control levers related to the slewing ring, and to operate the two articulated devices using

  at least one actuator controlled by a sensor-transmitter assembly of information

  tions. In the case of a failure of an articulated device or its control device when the train is traveling at a high speed, -2 - the stiffness of the primary suspension is then sufficient to

  the bogie remains stable in alignment.

  The bogie according to the present invention is characterized in that the control device comprises at least one jack controlled by a sensor-transmitter information unit, the sensor being on board the bogie and the transmitter being placed in a fixed position at

the entrance of a curve of the way.

  To avoid the mechanical transmission of a force between the jack and each lifter of an articulated device, the control device comprises two jacks, each jack actuating a rudder

of an articulated device.

  It is described below, by way of example and with reference

  In the accompanying drawings, a bogie according to the invention provided with two jacks.

  Figure 1 shows such a bogie, seen from above.

  Figure 2 shows the same bogie, seen from the side.

  Figure 3 shows a primary suspension according to III of the

figure 2.

  Figure 4 shows a bogie spar, in section according to IV

of Figure 2.

  In Figure 1, the bogie frame consists of two longitudinal members 1 connected by a lower cross 2. The body is connected to the bogie via a pivoting ring 3 of central vertical axis 4. This ring is secured of an upper cross member 5. This cross member 5 is supported at each of its ends on a longitudinal member 1 of the frame by means of a spring 6 forming a secondary suspension. This chassis carries two axles 7,

  each axle being carried by two axle boxes 8.

  Two bolts of axles 8 are visible in Figure 2 and only one is shown in Figure 3, the latter being connected elastically to the frame by four elastic blocks 9 made of elastomeric elements separated by steel plates. FIG. 2 shows that a spar comprises, at each of its ends, a

  insert 10 which receives two elastic blocks 9.

  Each axle 7 carries two wheels 11 and a geared motor unit 12.

  Both axles are steerable to the extent that the main axis 21 of an axle can pivot about a vertical imaginary axis 20 - 3 - and with a small deflection, as shown by the two positions

  extremes 22, 23 that can reach each axle axis 21.

  This low pivoting is ensured for one axle, by two connecting rods 30, 31, the connecting rod 30 being attached to a box and housed in a spar, the connecting rod 31 being attached to the other boot and housed

in the other spar.

  Each rod is articulated on a rudder 32, and each rudder also receives another rod. An articulated device, comprising a rudder 32, a connecting rod 30 and a connecting rod 31, is then housed in a spar and actuates an axle box of

  each axle as shown in Figure 2.

  Figure 4 shows a spar 1 consisting of an assembly of four plates welded together, an upper plate 1A, 2 sides 1B and a lower plate 1C. This spar contains a beam 32 and the two connecting rods 30, 31, the swivel bar about an axis 33 and being actuated by a jack 34 mounted outside the plate 1C, as can be seen in Figure 2. This cylinder is supplied with fluid by a source not shown, and through

a servo valve not shown.

  The bogie also comprises an onboard sensor 41 and a

  electronic gearbox, not shown, driving the two servo-valves.

  The track is equipped with a transmitter 42.

  The sensor-transmitter assembly can be of the barcode type,

  electromagnetic, or waveguide.

  Such a bogie operates as follows: at the entrance of a curve, the transmitter delivers a signal giving the

  characteristics of this curve and the sensor receives this signal.

  The electronic boot processes it and drives the servo valves that

each control a cylinder.

  In FIG. 2, the output of the rod of the jack 34 brings the two wheels 11 closer together, which must correspond to a retraction of the rod into the opposite jack to move the other two wheels, and of the same value, in order to obtain a pivoting of each axle

around the imaginary axis 20.

  At the exit of the curve, the cylinders are reactivated in the sense

  opposite, to bring back the two parallel axles.

-4 -

Claims (2)

CLAIMS:   1 / Bogie with two steerable axles, pivotally mounted under a body of a railway vehicle, comprising a frame (1, 10, 2) connected to each axle (7) via two axle boxes (8) and a primary suspension (9), two articulated devices (30, 31, 32) each connecting the two boxes of axles (8) situated on one and the same side of the chassis, and a device for controlling the two articulated devices, characterized in that the control device comprises at least one jack (34) controlled by a sensor-transmitter assembly (41, 42) of information, the sensor (41) being on board the bogie and the transmitter (42) being placed in a fixed position at the entrance of a curve of the way.   2 / Bogie according to claim 1, characterized in that the control device comprises two jacks, the two jacks being coupled   and controlled by the sensor-transmitter assembly.