Compact hydraulic motor design could combine power with small size and low maintenance with overall control.  Hagglunds Drives AB latest range of hydraulic drives is beginning to make inrods in the construction industry.

In pile driving applications, this type of drive could
offer a number of advantages over traditional systems
including its small size and high power to weight ratio. In mobile machinery, cutting weight is always an important aspect of design. Already the company's latest range of motors is being incorporated into the related application of earth augers where there are similar demands on equipment.
In particular, says Ingemar Borg, Business Area Manager of Hagglunds Drives, the ability to handle shock loads is important. Hydraulic drives have the ability to handle these easily as has been proved in related applications in other industries. This is because having a high pressure hydraulic oil transmission, the unit is self-lubricated and able to absorb shocks that gearboxes cannot easily tolerate.
The Compact design is simple - the motor mounts onto the shaft and brakes can be connected directly to the winch drum or to the rear end of the motor. In winch
applications, the design is able to accommodate a function for free wheeling and or free circulation without clutches.
The motor has a number of safety features that are suitable for winches in pile drivers that include the ability to stop instantly. Also, the hydraulic design offers electrical isolation and meets the stringent environmental conditions in the industry.

Modular Design
The system comprises small modules which makes handling
during installation or maintenance quite straightforward.
Hagglunds Drives has coniderable experience of hydraulic motors and drive systems in a number of tough environments from construction and process industries, materials handling, fishing and marine sectors world-wide. Its products are backed up by a strong maintenance and service organisation.
The line of Compact motors has a power to weight ratio of around 1.5 to 2.0 kW/kg (0.9 -1.2 Hp/lb) which is three to four times higher than today's industry standard for motors in the 100-600 kW (135-820 Hp) range.

Caption: The ability to handle shock loads is an important feature in pile driver design.

For more information please contact:
Tony Kay, Hagglunds Drives Ltd
Foxbridge Way, Normanton
Wakefiel, West Yorkshire
England
Tel: +44 1924 2201 00
Fax: +44 1924 8901 11

Christer Sahlberg, Hagglunds Drives Inc.
2275 International Street
Columbus, Ohio 43228
USA
Tel: +1 614 527 7400
Fax: +1 614 527 7401