Bosch Rexroth Gerotor pump

Bosch Rexroth Gerotor pump

Bosch Rexroth Gerotor pump is hydraulic pumps with fixed displacement for low-pressure requirements. It is typically employed in combination with other Rexroth pumps.

Via the driving disk, the shaft drives the inner rotor in the direction of rotation shown. The inner rotor meshes with the outer rotor and causes the same to rotate as well. The tooth clearances opening in the suction area (S) prime the hydraulic fluid.

The suction and pressure area are separated on the opposite side of the meshing area (Z) by a radial gap (R) created by the tooth profile of the outer and the inner rotor sliding against each other. Within the pressure area (P) the hydraulic fluid is pumped into the pressure port as the chambers become.

Properties

The gearing with cycloid contour is characterized by a large meshing length. Filling zone and displacement area cover a large rotation angle. This results in low flow pulsation and thus very low operating noise. The shaft and the displacer are supported by a slide bearing and work in a wear-free manner when used as intended. Gerotor pumps PGZ are self-priming.

Construction

• Hydraulic pumps of the PGZ type are Gerotor pumps with fixed displacement. They mainly consist of:
• Flange housing (1)
• shaft (2)
• the displacer elements inner rotor (3)
• outer rotor (4)
• as well as driving disk (5)
• cover (6)

Materials used

• Flange housing (1): Aluminum
• Shaft (2), inner rotor (3), outer rotor (4), and driving disk (5): Steel
• Cover (6): Cast iron

Application

• Cooling
• filtration or lubrication circuits at low pressures in industrial or mobile applications
• plastics processing machines
• machine tools
• presses and wind turbines

Features

• Low-pressure pump with fixed displacement
• Very low operating noise
• Suitable for wide viscosity and speed ranges
• Very good suction behavior
• Flexible combination possibilities with Rexroth axial piston, internal gear, and vane pumps

Technical data

Type

• Gerotor pump

Line connection

• Flange connection

Shaft load

• Radial and axial forces cannot be transmitted

Direction of rotation

• Clockwise

Frame size

• 4, 5

Size

• 20… 140

Maximum operating

• pressure 15 bar

Maximum displacement

• 136.3 cm³

Data Sheet