Bearing of the gear shafts in gear pumps

FunctionGear pumps are used in many applications to deliver liquids (media) or as a forcetransmitting drive for hydraulic motors. The gear pump delivers the medium evenly from the intake side (intake), through the gears and to the thrust side (exhaust). Among other applications, gear pumps are used in vehicles as a fuel pump, oil pump or coolant pump. The chemical industry uses gear pumps to deliver organic and inorganic chemicals. Within construction machinery and agricultural machinery, gear pumps are used as a drive for hydraulic motors, for example.

PERMAGLIDE^® P180 plain bearings are used as the main bearing for the gear
shafts in gear pumps. A low operating bearing clearance is essential for the high build-up of pressure and for low gear-pump leakage. To ensure a fault-free hydrodynamic operating state, the plain bearings must exhibit a bearing clearance tailored to the operating medium. The plain bearings come into direct contact with the operating medium. Aggressive media may be used, depending
on the application. The plain bearings must therefore offer high resistance to abrasion, good resistance to erosion, chemical compatibility and low swelling tendency.

PERMAGLIDE^® P180 plain bearings meet these requirements. The excellent dry-running behaviour of PERMAGLIDE^® P180 plain bearings also ensures a low level of wear in the mixed friction operation that occurs when the pump is switched on and off.

• Application: Central lubrication with stationary combustion engines
• Displacement: Up to 1400 cc/rev
• Engine speed: 2,000 to 2,500 rpm
• pmax: 25 bar
• Flow: up to 1,600 l/min

• Hydrodynamic operation
• Sliding speed up to 10 m/s
• High media compatibility
• Low operating bearing clearance
• High resistance to abrasion
• High resistance to erosion
• Good chemical resistance
• Low swelling tendency
• Low level of wear, even at high engine speeds and mixed friction

• Universal-use bearing material for dry and lubricated applications
• Material: lead bronze sintered onto a steel base, friction-minimising additives PTFE and lead.
• High rigidity
• Durability
• Optimum corrosion protection
• Good emergency running property

In damp environments in particular, this sliding layer system provides outstanding protection against corrosion.

Moreover, lead and PTFE have an extremely low absorption tendency. Absorption of the surrounding fluids, swelling of the materials and chemical damage to interacting sliding partners are prevented. The result is dimensional stability and optimum corrosion protection during use.

Among other things, gear pumps comprise a multiple-component housing, gears and gear shafts.

Gear pumps are used in many applications, including

• The chemical industry
• The automotive industry
• Agricultural machinery
• Construction machinery
• Foodstuff engineering
• Machine tool manufacture