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INDUSTRY FOCUS


RAIL sliding doors


A subsidiary of BIBUS in Hungary and ACE Stoßdämpfer have helped a specialist


in rail-guided wagon and bus equipment to find a sustainable damping solution for its pneumatically operated sliding doors


this area there are therefore numerous specialist companies which, in turn, work with specialised suppliers. In Hungary, one of these companies is Metal 99, whose engineers are in contact with transport companies at home and abroad, including BKV Budapest Transport Corporation and MÁV Hungarian Railways. Metal 99 began in 1991 with the repair of high-


D


voltage devices, windows and doors, as well as the production of door systems for public transport. Today, however, it has a team of over 100. Péter Garajszki, managing director, commented: “In particular, our windows and doors, which are manufactured in-house, enable public transport to be as sophisticated as it is safe.” The company also manufactures windows with


a specially designed profile system and is known for its sliding doors, as well as for electrically and pneumatically operated interior and exterior sliding and pivoting doors. These can be designed and adapted according to customer requirements. The team also designed the doors for


the Hungarian high-speed trains, which are integrated into the new Inter City carriages, explained Garajszki. Metal 99 has been successfully cooperating


with BIBUS in Hungary for many years in pneumatics and other areas. The Swiss corporation BIBUS AG and its Hungarian subsidiary are first addresses in Europe for full service when it comes to hydraulic and pneumatic drive and control systems. Since the group is also known as a trusted supplier of complete systems, the request to BIBUS Hungary in this case was whether they could supply a large number of high-quality industrial shock absorbers. The goals were to ensure that the door opening and closing system for numerous wagons is as sustainable and reliable in the end positions as possible, and to safeguard continuous operation by also protecting the doors against possible vandalism.


a decision Dávid Garajszki, technical director at Metal 99, and his team are experienced in using high- quality materials and components as standard equipment for their constructions. This is the reason why they re-evaluated the original design of the trains which, at an earlier stage, considered shock absorbers made in China to be integrated in the end position of the doors. Due to the end user’s location in the Middle


East and the importance of the project, Garajszki opted to use shock absorbers with proven


2 DESIGN SOLUTIONS JUNE 2026 6


ue to the increase in passenger numbers, the importance of safe, sustainable designs in rail car construction is increasing. Within


reliability and of higher quality in order to prevent possible failures once the whole construction was delivered to the customer. Therefore, they addressed their pneumatics specialist BIBUS which offers a wide range of hydraulic products. Nobert Turi, BIBUS’ sales manager, explained:


“I recommended to him the shock absorbers from ACE, which we sell exclusively in Hungary, in the same dimensions and with comparable technical data such as those of the other dampers.” After free sampling and testing, Garajszki


and the team at Metal 99 were convinced of the long-term qualities of the hydraulic components supplied by BIBUS. However, their price was higher than that of the Chinese competitors. Turi then took a closer look at the shock absorbers and also at the application. For the 55kg that the sliding doors weigh and


which are moved at a maximum speed of 2m/s, dampers with energy absorption of 59 Nm/cycle were initially selected. Since he knew from his long experience of cooperating with ACE that the company takes high safety tolerances into account for their miniature and industrial shock absorbers, he then made a new suggestion.


shock absorber selection In order to get closer to the price structure of the dampers selected in Dabas, Hungary, at the very beginning, he offered another miniature shock absorber type from ACE, whose catalogue values of 41 Nm/cycle are below the initial data.


Metal 99’s sliding doors feature compact actuators as well as powerful miniature shock absorbers for safety


To be on the safe side, he asked ACE to validate


the expected maximum overload of the dampers in the event of an emergency stop as part of drop tests carried out by the company. For this worst- case scenario, he confirmed the established key data of 55kg door mass being accelerated at a maximum speed of 2m/s. Accordingly, ACE’s engineers set up the


drop test bench and placed the newly selected miniature shock absorbers on a load cell. In the following series of drop tests, the self- adjusting MC225EUMH type miniature shock absorbers not only decelerated the energy, but also withstood the load with unharmed seals and other important components. BIBUS in Hungary, as well as the team at Metal 99, were satisfied with the reliable operation and deceleration of the small components. To prevent more destructive interference


from very strong travellers harming their sliding door system, Metal 99 added an additional component. This was possible since the competitive pricing of BIBUS allowed the client team to specially manufacture rubber buffers that give extra protection to the end positions and sliding door profiles. Turi commented: “I think that this case shows


us very well the safety reserves that ACE’s shock absorbers have. In my opinion, it is worth taking a very close look at the catalogue data of all suppliers when it comes to their performance. If someone specifies higher data than ACE for comparable diameters of their dampers, then that is what I call a boast. And if anyone doubts that, I would like to ask for an official comparison test." Péter Garajszki is happy to forgo this, and he


and his team are very content about the safe, sustainable, solution from the BIBUS-ACE team.


ACE Stoßdämpfer www.ace-ace.de


BIBUS www.bibus.hu


Metal 99 www.metal99.hu


www.designsolutionsmag.co.uk


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