SK137893A3 - Undercarriage with double axles - Google Patents

Abstract

Twin axle drive or connection of two twin axle drives which save on overall height and mass in the short powerflux of the perpendicular loading and ensure, when travelling in a tight bend in the track, the necessary rotation angle with an acceptable rotation resistance and ensure transverse play better than a link suspension. According to the invention, the object is achieved in that the leaf springs (10) are coupled at their ends to the wagon stays to the side of the lateral members (3). A support pendulum (14) is supported on the spring collar (11) of the leaf springs (10) and rolls with the necessary resistance in the longitudinal direction of the vehicle without restoring force and thus brings about the necessary restriction on rotation. In the transverse direction, the restoring force and transverse restriction required for transverse play is produced by the design of the crowned rolling segment of the support pendulum (14). In the connection of two twin axle units, steering is effected by a Beugniot lever. Both axle units are connected to a transverse coupling. The invention is preferably suitable for use with low-level wagons (1) with a continuous floor height and small wheels. <IMAGE>

Description

FIELD OF INVENTION ........

The invention relates to a bogie with twin axles respectively. joining two bogies with twin axles into one bogie group, preferably for low-floor wagons with running floor height and small wheels.

BACKGROUND OF THE INVENTION

Biaxial bogies with small wheels are known which, by means of a central pivot pin mounted on a crossbeam (lower cradle), load the longitudinally disposed leaf springs on both sides. These springs are hinged to the side walls by the lifting eyes. DE-S 1530146 discloses such a chassis. In this type of construction, the force flow of the perpendicular load is disadvantageous. From the longitudinal beams located near the low-floor floor, the load in the vehicle shall be transmitted to the center via the bogie and from there through the pivot in the bogie to the springs located on the sides. This requires both construction height and weight.

A more preferred solution is described in DE-AS 3839994. Here, the double-axle bogie side leaf springs are located on side brackets which are connected to the sidewalls. This achieves a shorter force flow and saves design height and weight. The disadvantage of this solution is that, due to the available space, the suspension eyelets of the springs cannot be made to the required length, and therefore, when driving in an arc, there is a high turning resistance and wheel return torque which are at the edge of derailment safety. This is reinforced by the fact that bogies with twin axles have a larger pivot angle (deflection) in the same track curve than a free deflection axle.

Summary of the invention .......

It is an object of the invention to provide a bogie with twin axles, respectively. the coupling of two such bogies with twin axles which, in the case of a short force flow of perpendicular load, saves design height and weight and, when traveling in a small curved track, guarantees the necessary pivot angle at permissible deflection and lateral clearance more than the hinge eye. The problem is solved in the new bogie according to the invention with twin axles in that the leaf springs are connected at their ends by means of hinges to the side pillars along the side walls. The leaf spring collar supports the support pendulum (cradle), which rolls in the longitudinal direction of the vehicle with the required resistance without return torque, thus creating the necessary deflection braking. In the transverse direction, the necessary restoring torque and transverse braking are generated by the transverse play due to the convex shape of the supporting pendulum rolling segment due to different radii.

When two such bogies with twin axles are combined into one bogie group, the longitudinal and transverse articulation is achieved by the Beugniot lever on the vehicle. The perpendicular forces are distributed evenly on the successive pendulum feet by means of a leveling lever on each side. In order to ensure radial alignment of the two twin-axle coupled bogies for curved travel and for smooth vehicle movement, a cross coupling is provided between the two adjacent bogie frames.

Explanation of pictures

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will now be explained with reference to the drawings, in which: FIG. 1 is a side elevational view of a twin axle bogie under a partially depicted low platform wagon; FIG. 2 is a plan view of the twin axle bogie; FIG. 4 is a sectional view along line II - II of FIG. 5 shows another sectional view according to line II-II of FIG. 2 in an enlarged view, FIG. 6 shows a section along line III-III of FIG. 2, FIG. 7 a side view of a coupling of two bogies with twin axles; Fig. 9 is a sectional view along line IV - IV of Fig. 8 with twin axles with two slits A to show the articulation of the tie rod ιγ * ί;

DETAILED DESCRIPTION OF THE INVENTION

The embodiments of the double-axle bogie and its associated connecting elements are shown below in the figures below the low wagon wagon 1, of which only a small part is shown. The torsion bogie frame 2 consists of two T-shaped parts which in turn consist of a sidewall 3 and a side pillar 4 fixed thereto; one spherical plain bearing .5. it connects the two T-shaped parts and allows them to twist. Axle bearings 6 are inserted into the side walls 3 in elastic buffers 7, which support the wheelsets 8, equipped with small wheels. At all four ends of the side pillars 4 there are spring brackets 9 which are articulated with leaf springs 1.0. The leaf springs 10 have on their sleeve 1.1. hatch with spherical head. After the contour correction of the wheelsets 8 of the wheelsets 8 has been made, a compensating height loss can be inserted between the spring sleeve 11 and the cover 12. The cover 1.2 and the support pendulum 14 have a common spherical radius 15 on which the pendulum is mounted so that it can perform a pivoting and tilting movement. The support pendulum 14 has in the upper part a rolling segment 16, whose rolling radius 17 has a spherical radius 1.5. common center point. In this way, when entering the track curve, the rotation without reversing moment occurs. Rotational braking due to friction on the spherical surface depends on its load, and by varying both radii (spherical radius 1.5 and rolling radius 17j), the rotational braking is variable over a wide range. Convex contour with folding radius 18. This folding radius 18 is greater than the rolling radius 17. The ratio of both radii determines the return torque The transverse braking resulting from the load-dependent friction of the spherical bearing surfaces is smaller in the radius ratio. position, the center points of the tipping radii 18 can be separated from each other by a small distance (span) 19, so that a straight rolling tensioning tension is produced at the top

in. .

This measure produces a transverse characteristic which, before movement occurs, causes an increase in force which is greater than transverse braking at a corresponding span width of 19. The rolling segment 16 supports a low platform wagon 1 on both sides via a planar support 20 with a rotating edge. In the longitudinal direction, the bogie with twin axles is via the pivot pin 21 (mounted in the center of the bogie under the low-platform wagon) of the steering rod 22. which, at both ends, has spherical plain bearings 2.3., articulated with a side column 4.

In the transverse direction, the lateral deflection of the bogie with twin axles is limited by the flexible transverse stops 24, which are attached to the brackets 25 of the low-platform wagon 15 and are at a desired distance from the bogie stop brackets 2.6.

The combination of two bogies with twin axles into a four-axle bogie group requires, in addition to the coupling elements described below, also specific modifications of the individual bogies with twin axles. In this way, the longitudinal and transverse articulation of the bogie group is effected by the Beugniot lever 27. flexible transverse stops which are attached to the bracket 25 of the low-platform wagon .1. Both double-axle bogies are longitudinally and transversely connected by a triangular steering at its top by a spherical bearing 23 with a Beugniot lever 27 and at its base by two rotary bearings 31 which are mounted on the outer side pillars 4 of the wagon. The perpendicular force transmission is carried out from the low-platform wagon 1 on both sides through a centrally located balancing bar 3.2, which has flat supports 20 at its ends. These are supported by a pendulum 10A.

The rolling segments .1.6 and the flat supports .2.0 shall be designed with a correspondingly large area in accordance with the larger 'J' bogie variations resulting from the greater distance between the pivot points and the greater distance between the end axles. In order to achieve smooth running and radial alignment of the bogies with the double axles of the bogie group, a cross coupling of both bogies is made. This consists of a connecting rod 3.3, which is connected by means of elastic cardan joints 34 approximately at the height of the leaf springs 1.0. each with an opposing spring bracket 9 of the bogie frame.

Claims (10)

PA TENTOVÉ Claims from ^9/4 n $ u- Double-axle bogie, twisting bogie frame, two wheels with a small wheel diameter and articulated in sidewall in elastic bumper mounted axle bearings, characterized in that the bogie bogie frame (2) consists of two T-shaped parts which: are formed from the sidewall (3) and the side pillar (4) fixed thereto, at the end of one sidewall (3) being connected to the other side pillar (4 ') by a spherical bearing (5), the four ends of both side pillars (4; 4 ') there are spring brackets (9) to which the two leaf springs (10) are articulated, which bear on the spring sleeve (11) in their center one support pendulum (14) on which the flat foot (20) is supported. ) of the low - lift wagon (1). Double-axle bogie according to claim 1, characterized in that each spring sleeve (11) of the leaf springs (10) is supported by a round head cover (12) on which the support pendulum (14) is mounted and between the spring sleeve (11) and the hatch (12) are fitted with washers (13) if necessary. Double-axle bogie according to claims 1 and 2, characterized in that the supporting pendulums (14) with their convex rolling segments (16) have a rolling radius (17) whose center is identical to the center of the ball radius (15) of the cover (15). 12) and a tilting radius (18) causing a convexity that is greater than the rolling radius (17) and the rolling segments (16) support the flat feet (20). Double bogie according to claims 1 to 3, characterized in that the rolling segment (16) has in the center a flat region with a span (19) to which the convexity forming the folding radii (18) is fed on both sides, the radii (18) are spaced apart (19) Ί Double-axle bogie according to one of Claims 1 to 4, characterized in that a pivot pin (21) is mounted above the center of the bogie frame (2) under the low-floor wagon (1), which bears a spherical bearing (23) connected to the steering rod. (22), which in turn is connected via a spherical bearing (23) to one side column (4). Double-axle bogie according to claims 1 to 5, characterized in that the transverse stops (24) are elastic and are located between the stop brackets (26) of the sidewall (3) and the brackets (25) under the low-platform wagon (D. Double-axle bogie according to Claims 1 to 4, characterized in that the two bogie frames (2,2 ') are connected horizontally by means of a Beugniot lever (27) which is pivotally and transversely movably connected in the middle of both bogie frames (2). 2.2 ') at the bottom of the low-platform wagon (1) via a double-sided flattened pivot pin (28) with a slotted liner (29) and the connection between the Beugniot lever (27) and the outer side posts (4,4') is made via triangular control ( 30), this being connected to the base via two rotary bearings (31) and at the top via a spherical bearing (23). Double-axle bogie according to Claims 1 to 4 and 7, characterized in that elastic crossbars (24) are located on both sides in the middle of the Beugniot lever (27) and are connected at the bottom by a low-platform wagon (1) via a bracket (25). ). Double-axle bogie according to claims 1 to 4 and 8, characterized in that the two flat feet (20) of the supporting pendulums (14) lying on each side are located at both ends of the equalizing lever (32) and are attached under the low-lift wagon movably. A bogie with twin axles according to claims 1 to 10 l.ÚÁ.ik.MtUM'.fe .L ' 8 4 and 7 to 9, characterized in that the two bogie frames (2,2 ') are connected to each other by means of elastic universal joints (34) by a connecting rod (33) lying transversely to the direction of travel at the height of the leaf springs (10) .