DE9421460U1 - Pantograph - Google Patents

Description

OIDTMANN ■ BOCK WARN* ." ^: .„ ^: KSOLL
STUHLMANN - WILLERT

FILE NO. 46/-001

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PATENT ATTORNEYS

DR.-ING. PH OIDTMANN* D1PL.-1NG. R. BOCKERMANN* DR.-ING. P. KSOLL
DR.-ING. W. STUHLMANN f DJPL.-1NG. R. WILLERT

EUROPEAN PATENT ATTORNEYS*

Bergstrasse 159 /

44791 BOCHUM

PO Box 1024 50
44724 BOCHUM

16.10.1995 XR/Mon

STEMMANN-TECHNIK GmbH 48459 Schüttorf

Pantograph

The invention relates to a current collector for an electric traction vehicle according to the features of the preamble of claim 1.

Such pantographs are known in the form of four-arm, two-arm and single-arm pantographs. Usually they are pivoted on a base frame that is attached to the roof of an electric motor-driven vehicle. Depending on the application, different designs are used for the actuating devices for raising and lowering the pantographs and for generating the contact force of the contact bars against the overhead line. Basically, a distinction can be made between pneumatic, hydraulic, mechanical and electric motor drives.

As a rule, the lifting force of the pantograph to generate the contact pressure of the contact strips against the contact wire is provided by main tension springs built into the base frame.

Telephone (0234) 519^^5^/5^··, Tejefjix (O^34),5« _# O5 12 ■ Telex 825361 swop d
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It is also known to generate the buoyancy force by means of a compressed air cylinder or a compressed air bellows. In this case, the pantograph drives take on two functions, namely, on the one hand, raising and lowering the pantograph and, on the other hand, generating the contact force for the contact bars.

The known designs have proven themselves in operation. However, due to new performance requirements, there is an effort to lower the pantograph from the contact wire as quickly as possible.

Based on the prior art, the invention is therefore based on the object of creating an actuating device for a pantograph which enables the pantograph to be quickly removed from the contact wire and ensures that the pantograph reaches its lowest position in a dampened manner.

According to the invention, this problem is solved by the features set out in the characterizing part of claim 1.

Further advantageous embodiments of the invention form the subject matter of claims 2 to 7.

The core of the invention is the integration of at least one multi-chamber piston cylinder into the drive of the pantograph. This has at least two chambers. However, a higher number of chambers is also conceivable.

The chambers are connected to each other so that an exchange of the actuating medium for the piston cylinder can take place. By coupling the chambers in the cylinder, the actuating medium can be released suddenly from the first chamber and fed to the downstream chamber.

mer. This has the effect that the current collector can be lowered quickly and is then caught again by the fact that the actuating medium now in the downstream chamber is discharged in a controlled manner via a throttle device. This achieves a controlled damping of the current collector. This enables the current collector to be lowered quickly, with the large mass being achieved by the controlled reduction of the actuating medium in the downstream chamber. The downstream chamber thus functions as an intermediate storage facility for the actuating medium and as a damping device for the current collector. The current collector according to the invention can meet the requirements for short reaction times while at the same time protecting the components.

In principle, the pantograph drive can be operated pneumatically or hydraulically. In practice, however, pneumatic actuation will predominate.

In an advantageous embodiment of the basic concept of the invention, the multi-chamber piston cylinder is constructed in such a way that a further cylinder is connected directly to the end of a single-acting piston cylinder. This embodiment then creates a double-chamber system. A piston is arranged in each chamber. The two pistons are connected to one another via the piston rod. The multi-chamber piston cylinder thus consists of two cylinders arranged one behind the other, both of whose pistons have a common piston rod.

In principle, the multi-chamber piston cylinder can also be designed in such a way that it has a cylinder forming the housing in which several pistons are arranged directly or indirectly coupled via the piston rod

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The individual chambers are then only separated from each other by the pistons.

As already mentioned, the individual chambers of the multi-chamber piston cylinder communicate with each other. The connection can be easily achieved using hose lines and the corresponding activation of inlet and outlet connections as well as valves. In principle, however, it is also conceivable to create the connection between the chambers using the pistons and/or the piston rod.

The invention is explained in more detail below using an embodiment shown in the drawings. They show:

Figure 1 shows a side view of a single-arm pantograph with an integrated multi-chamber piston cylinder;

Figure 2 shows the single-arm pantograph of Figure 1 in plan view

Figures 1 and 2 show a single-arm pantograph 1 for extracting electrical power from a contact line for an electric traction vehicle. The single-arm pantograph 1 is mounted on a base frame 2 and distanced from the vehicle roof of the traction vehicle (not shown here) by electrical insulators 3.

In addition to the base frame 2, the single-arm pantograph 1 essentially consists of the upper scissors 4, the lower scissors 5, the lower handlebar 6, the upper handlebar 7 and the upper part 8, referred to as the rocker, with the two contact brackets 9.

To operate the single-arm pantograph 1, i.e. to raise and lower or to generate the pressure force of the contact bracket 9 against the contact wire, a pantograph drive 10 is arranged in the base frame 2. The pantograph drive 10 comprises two multi-chamber piston cylinders 11, which are movably suspended in the base frame 2.

Each multi-chamber piston cylinder 11 has two chambers 12, 13 connected in series, which are coupled to one another via lines 14, 15 and valves 16. The housing of the two chambers 12, 13 is formed by the cylinders 17, 18. The cylinder 18 is attached to the cylinder 17 and forms a torsion-resistant unit with it. Each multi-chamber piston cylinder 11 is articulated to the base frame 2 via a suspension 19.

The pantograph drive 10 is operated with compressed air. By coupling the chambers 12 and 13, the compressed air can be released suddenly from the front chamber 12 when the single-arm pantograph 1 is lowered and fed into the downstream rear chamber 13. In this way, the single-arm pantograph 1 can be lowered quickly, with its mass being absorbed by the fact that the piston of the rear chamber 13 has to work against the compressed air introduced there. The compressed air is discharged from the rear chamber 13 in a controlled manner via a throttle 20 during the lowering process. As a result, the pantograph can be lowered quickly from the contact wire, with the pantograph reaching its lowest position being dampened. This meets the high performance requirements and short reaction times while protecting the components.

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Reference symbol list

1 - Collector

2 - Base frame

3 - Insulators

4 - Upper scissors

5 - Lower scissors

6 - lower handlebar

7 - upper handlebar

8 - Seesaw

9 - Sanding bar

10 - Pantograph drive

11 - Multi-chamber piston cylinder

12 - Chamber

13 - Chamber

14 - Management

15 - Management

16 - Valve

17 - Cylinder

18 - Cylinder

19 - Suspension

20 - Throttle

Claims (6)

• C* · · Protection claims 1. Current collector for an electric traction vehicle with at least one upper scissors (4) carrying a contact bracket (9), at least one lower scissors (5) pivotably mounted in a base frame (2) on a roof of the vehicle and a current collector drive (10), characterized in that the current collector drive (10) comprises at least one piston cylinder (11) having at least two chambers (12, 13). 2. Current collector according to claim 1, characterized in that the chambers (12, 13) communicate with each other. 3. Current collector according to claim 1 or 2, characterized in that the piston cylinder (11) has a piston rod to which a number of pistons corresponding to the number of chambers (12, 13) is assigned. 4. Current collector according to one of claims 1 to 3, characterized in that the piston cylinder (11) can be actuated pneumatically. 5. Current collector according to one of claims 1 to 3, characterized in that the piston cylinder (11) is hydraulically actuated. · 6. Current collector according to one of claims 1 to 5, characterized in that a throttle device (20) is assigned to the piston cylinder (11) on the outlet side. 7, Current collector according to one of claims 1 to 6, characterized in that the piston cylinder (H) comprises two interconnected cylinders (17, 18) and two pistons coupled to one another.