Stricter exhaust emission limits and diesel driving bans are on everyone's lips. Many local authorities are tightening their environmental regulations. As a result, particularly economical or alternative drive systems are becoming more attractive for commercial vehicles. For mobile and crawler cranes in particular, a general market trend is currently emerging with the "downsizing" of diesel engines. The aim is to reduce emissions and comply with local authority regulations in densely built-up, urban areas.
This trend toward compact design and low-emission drives is a challenge for design and final assembly. The individual vehicle components have to be joined together safely and quickly in a tighter space, without increasing cycle times on the assembly line as a result. Construction machinery manufacturers are therefore relying on the new Universal Push to Connect plug-in system from Parker. It is particularly suitable for tight installation spaces and short cycle times on the assembly line.
With this trend in mind, Parker developed a new product series called Universal Push to Connect (UPTC). In addition to the classic bolting program, UPTC is a push-fit system for hose and tube connections. It is ideal for use wherever conventional connections fail due to high pressures and strong vibrations, the aforementioned tight installation spaces exist and assembly must be carried out quickly in series production.
A number of construction machinery manufacturers are now using the system. It can be combined with all 24-degree fittings according to ISO 8434-1. On request, the hose manufacturer can supply prefabricated hoses and formed-on tubes, which gives users advantages in logistics and warehousing because the number of components to be kept in stock is reduced.
The fitting system is particularly quick and easy to assemble: The end of the tube or hose is brought up to the system nut and inserted. As soon as the stainless steel locking ring is engaged, the connection is held vibration-proof in the joint. Even after a long period of use and in the event of heavy soiling - which is naturally the case with construction vehicles - the system nut is released again without the use of special tools. The nut, which has a highly corrosion-resistant surface, is available in sizes from 8 to 28 millimeters and is designed for nominal pressures of up to 400 bar, thus offering designers sufficient leeway.
The user checks whether the connection has been correctly assembled by means of a red marking. This is a sealing ring that lies in a pipe groove and serves as a visual assembly check. If this mark is inside the nut, this is an unmistakable sign of a correctly assembled and leak-free connection.
The system is protected against dirt penetrating from the outside. Another argument in favor of the UPTC system is that where other hydraulic connections can involve leaks and leakage costs in the field due to over- or under-assembly, the plug-in system eliminates these possibilities for error. Thanks to the Double-Lock technology built into UPTC. This provides an additional pressure lock in the connection that uses its own system pressure to keep the connection free of backlash and leakage for a long time.
Together with the vibration-proof design and the process reliability provided by clear, visual assembly control, there are therefore sufficient reasons to consider using the Universal Push-to-Connect system as an alternative to conventional connections.
Stricter environmental regulations may be a challenge for commercial vehicle manufacturers, but they also encourage innovation and ultimately lead to new possibilities in design. For more information contact us.
This article was contributed by Vincent Coady, product manager, DIN Steel, for the High Pressure Connectors Europe Division of Parker Hannifin Corporation.