DE102009056589A1 - Power shoe for O-soot-and third-rail electricity consumer, has contact support connected with rotational point in small distance from rail, and sliding contact pieces electrically isolated with each other in contact support - Google Patents

Abstract

The shoe has a set of sliding contact pieces (1, 1') arranged in spring elements (2, 2') at a contact support (3) that is formed as a rocker. The contact support is connected with a rotational point (4) in a small distance from a contact line (5) and/or conductor rail with an electricity consumer by a spring tension. The sliding contact pieces are electrically isolated with each other in the contact support, and the sliding contact pieces are guided to the contact line. Another set of sliding contact pieces is rotatably connected with the spring elements.

Description

The invention relates to current collector with a current shoe for pantographs of trolleybuses (O-buses) and third-rail pantograph with two mutually parallel sliding contact pieces.

O-buses and rail-mounted electric vehicles with a third-rail pantograph are electrically connected via power shoes to the respective power supply system. In contrast to pantographs with an abrasive strip, in which due to the zigzag guiding the catenary of the electrical contact to this over the entire width constantly wanders, takes place in the carbon friction pieces of the current shoes, the electrical contact to the catenary or the third rail constantly on the same relatively small Contact points, which leads to a high contact load and thus to a higher wear. Additional irregularities in the power supply systems can lead to the destruction of the carbon abrasive pieces of the power shoes.

Catenary and busbar systems are subject to change over time. They not only wear, but also change due to temperature fluctuations and other weather conditions. Storm, rain and icing, in particular, cause changes in catenaries. In addition, there are mechanical damage due to a wide variety of external influences.

All pantographs are pressed by means of adjustable spring force to the contact line or to the busbar. Busbars are due to the crowded design and the associated relatively short spring travel of the pantograph have the least possible lateral and vertical deviation from the desired position. The target position is tightly tolerated. In practice, busbar systems are rarely found without deviations from these target positions. Thus, the electrical contact between the current shoe of the pantograph and the busbar is often not optimal. When changing the altitude of the third rail and deviations from the target altitude, the power shoes are at an angle to the busbar. As a result, there are only very few contact points between busbar and current shoes. The contact resistance is increased. Arcs and contact interruptions often occur here. High wear of the carbon abrasive pieces of the current shoes and the busbar are the result. Likewise, the arcs may cause disturbances in the electronics of the vehicles.

This problem is said to be in the patent DE 27 30 556 C2 described pantograph be avoided. The current collector has a plurality of current shoes, which are mounted isolated from one another in terms of vibration technology and have different resonance frequencies. The vibrations of the current shoes should be adjusted to each other so that there is always a current shoe in contact with the busbar.

Frequently, however, especially at higher speeds, by height changes of the busbar, for example, at expansion points or by shocks between the current shoes and busbar, the current shoes pushed away from the busbar. It creates contact interruptions and ironing. The structure of the described pantograph is very complicated. Since the current shoes and the suspensions wear at different speeds with this current collector, the resonance of the two current shoe mounts also changes.

In all known solutions in which a plurality of current shoes are firmly attached to each other on a current collector, are not in height differences of the busbar all Stromschuhe with this at the same time in contact. This results in high current densities at the few contact points, which in turn causes a very high level of wear. Also exists by the mechanically rigid connection of the current shoes mutual interference in occurring shocks to the busbars.

The rod pantographs for O-buses must also compensate for greater height differences of the contact line for contacting their current shoes with the catenary. The contact pressure on the contact line is constantly changing. An increase in the catenary leads to a low contact pressure result, which can lead to arcing and contact interruptions. There is a high level of wear on the power shoes and the overhead line. Likewise, vibrations occurring on the overhead contact line have a negative effect on the electrical contact with it. The coal sanding pieces of the streamers wear off heavily.

In pantographs track-bound vehicles, it is known to sprung individually arrange two sanding strips on a frame rocker, the basic setting for contacting the catenary and the compensation of the height differences of the catenary is done by the scissor arm of the pantograph. Such pantographs are in the PS DE 551 782 and AT 400 696 B described. In these solutions, a parallel linkage are hinged to a frame rocker lägst on a scissor arm to the catenary, each having its outer end points wear the abrasive rails. In a diagonal of the parallel linkage the springs are arranged for the individual suspension of the abrasive strips. As described herein, acting on the abrasive strips around their attachment points, contrary to the direction of travel, a torque that is caused by the frictional force between the contact wire and the contact strips. In a rigid connection of the abrasive strips with the rocker occurs at the front in the direction of travel abrasive strip on an increased contact pressure, which leads to a much greater Verscheiß the two abrasive strips. In the case of a mechanically rigid connection of the two abrasive strips, mutual interference of the abrasive strips occurs when impacts occur. These disadvantages should be remedied with the individual suspension of the sanding strips. The sprung mass of each sliding strip is thus lower. The springs should counteract the torque.

After AT 400 696 B It has now been found that a compensation of the torque acting on the grinding bars applies only to a certain degree of deflection, which corresponds to an average pantograph position. By additional cams on the rocker, the effective length and thus the spring force of the individual springs of the sanding strips should be adapted to the different current collector layers.

In the case of power shoes, the problem described is irrelevant due to the lower mass and its compact design and therefore found in pantographs for buses and third-party current collector no solution.

The aim of the invention is to reduce the wear of the sliding contact pieces of power shoes and to ensure uninterrupted electrical contact with the catenary or the busbar.

The object is to provide a Stromschuh simple design for pantographs of O-buses and third-rail pantograph with an improved support two sliding contact pieces.

According to the invention, in a current shoe with two sliding contact pieces, the two sliding contact pieces are arranged on spring elements on a trained as a rocker contact carrier, the spring with its pivot point at a small distance to the catenary or to the power rail with the other components of the pantograph in a known manner by means of adjustable springs is connected. In this case, the resilient connection of the contact carrier ensures the necessary contact force of the two sliding contact pieces on the catenary or on the busbar. The spring elements of the sliding contact pieces provide for a compensation of the contact force under the different operating conditions, whereby at least one sliding contact piece always produces sufficient contact with the catenary or busbar. The wear of the sliding contact pieces is thus reduced. Power interruptions are largely avoided.

In a further embodiment, the sliding contact pieces are electrically insulated from one another by spring elements made of an insulating material or a contact carrier made of an insulating material, so that the traction current does not have to be routed via both current shoes of the current collector.

The invention will be explained in more detail below using an exemplary embodiment.

In the accompanying drawings show:

1 a power shoe for an O-bus pantograph;

2 a power shoe for a third rail pantograph.

The pantograph for an O-bus pantograph after 1 has two sliding contact pieces 1 and 1' on a catenary 5 be guided. The two sliding contact pieces 1 . 1' are with spring elements 2 and 2 ' rotatably connected and on a trained as a rocker contact carrier 3 arranged. The contact carrier 3 is with his fulcrum 4 at a short distance to the overhead line 5 mounted on a Rute pantograph, in a known manner by means of adjustable springs, the necessary contact pressure force of the two sliding contact pieces 1 . 1' under track-related height differences on the overhead line 5 manufactures. The spring elements 2 . 2 ' the sliding contact pieces 1 . 1' ensure a balance of the contact pressure force under the different operating conditions, whereby at least one sliding contact each 1 . 1' always sufficient contact with the contact line 5 manufactures. When driving, loses the first sliding contact piece in the direction of travel 1 respectively. 1' by acting shocks or other disturbing influences the electrical contact from the catenary 5 , so is about the rocker mechanism of the contact carrier 3 the rear sliding contact piece 1 respectively. 1' stronger to the overhead line 5 pressed. The rocking movement of the contact carrier 3 is so limited that this always on the height changes of the overhead line 5 can adjust. By the spring elements 2 . 2 ' In addition, a tilting of the two sliding contact pieces 1 and 1' by the rocking movement of the contact carrier 3 avoided.

At the pantograph for the third rail after 2 are the two sliding contact pieces 1 and 1' each with two spring elements 2 . 2a and 2 ' . 2a ' on the trained as a rocker contact carrier 3 arranged. This also adds a more stable connection of the sliding contact pieces 1 . 1' with the contact carrier 3 reached. The contact carrier 3 is here with his fulcrum 4 at a short distance to the busbar 5 with the adjustable spring mechanism 6 or an air pressure system of a third rail pantograph connected to produce the necessary Kontaktanpresskraft. Is in the driving movement a sliding contact pieces 1 respectively. 1' from the power rail 5 moved away, so again is the second Stromschuh 1 respectively. 1' over the rocker mechanism stronger against the busbar 5 pressed. By the two individually spring-mounted and designed as a rocker contact carrier 3 mechanically connected sliding contact pieces 1 . 1' is constantly sufficient contact between the busbar 5 and the sliding contact pieces 1 . 1' guaranteed. The wear of the sliding contact pieces is thus reduced. Power interruptions are largely avoided. In a further embodiment, the sliding contact pieces 1 . 1' on the contact carrier 3 electrically insulated from each other and connected to each other by means of power cables.

LIST OF REFERENCE NUMBERS

1, 1 '

Current shoe,

2, 2a, 2 ', 2a'

Spring elements,

3

Contact carrier,

4

Fulcrum of the contact carrier,

5

Catenary, busbar,

6

Spring mechanism / air pressure system,

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 2730556 C2 [0005]
• DE 551782 [0009]
• AT 400696 B [0009, 0010]

Claims (2)

Stromschuh for O-Russ and third rail pantograph with two sliding contact pieces, characterized in that the sliding contact pieces ( 2 . 2 ' ) on spring elements ( 3 . 3 ' ) on a contact carrier designed as a rocker ( 4 ), which with its fulcrum ( 5 ) at a short distance to the overhead line ( 6 ) or to the busbar ( 6a ) is connected to a known pantograph, via a spring preload. Current collector shoe according to claim 1, characterized in that the sliding contact pieces ( 2 . 2 ' ) on the contact carrier ( 4 ) are electrically isolated from each other.

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