Bucher Hydraulics has developed the UP40 mini power pack with the aims of bringing the hydraulic control closer to the drive and achieving a continually more compact envelope.
- Features reduced dimensions compared to other products in the market
- External dimensions of 80 x 80 mm (3.1 x 3.1 in.) are defined by the extruded aluminium profiles that are used
- Dimensions that project outside that profile, possibly due to valve contours and accessories, are arranged on one side only
- Comes in various lengths based on electric motors and capacities of tanks used
- Tank consists of 80 mm diameter extruded aluminum tube mounted between the front and rear hydraulic control blocks
- Rear hydraulic control block is where majority of hydraulic circuit is incorporated
- Based on normal mini power pack consisting of external gear pump driven by DC electric motor
- Oil flow supplied by pump depends on pump displacement, speed of electric motor, and respective operating pressure
- Gear pump can be unidirectional or reversible type
- Power unit with unidirectional pump consists of standardized front control block containing adjustable relief valve and check valve
- Front block is used as connecting element between hydraulic pump and electric motor
- Single-acting version includes rear control block in which 2/2 seat valve and pressure compensated 2-way flow control can be incorporated, and can be supplemented with integral emergency hand pump
- Version featuring 4-way spool valve with two or three spool positions for controlling double-acting cylinders is under development and will include the ability to fit double pilot-operated check valve to minimize effect of leakage characteristic of spool valves
- Version for reversible pumps features front control block with double pressure relief valve and double pressure pipes taking oil to rear hydraulic control block
- Suction-side check valves of reversible pump are located on rear cover of gear pump, while optional double pilot-operated check valve is located on rear hydraulic control block
- External gear pumps – unidirectional as well as reversible – are part of the 05 Series, with displacements from 0.25 ccm/rev to 0.9 ccm/rev
- Higher displacements are available, but their power requirements are not matched by the ratings of the electric motors used
- Permanent-magnet electric motors provided are available in 12 or 24V DC versions (48V DC on demand), with power ratings of 0.5 kW (80 mm dia.) or 0.8 kW (85 mm dia.)
- Standard protection class of IP54 for electric motors
- Special configurations with other power ratings and/or classes of protection can also be considered
- Well suited for direct combinations of power unit plus cylinder, reducing installation dimensions in machines as there are no hydraulic pipes or hoses
- Can be installed either horizontally or vertically
- Potential applications include small tail lifts for trucks, gate openers, and many other applications where the hydraulic power unit must be extremely compact
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