Hydraulic Gear Motor

Introduction of Group2.5 Gear Motors

Group2.5 Gear motors from GRH type hydraulic motor is referred to as a Gear Motor, and has the characteristics of simple structure, small volume, light weight, small inertia, impact resistance, convenient maintenance, and low requirements for oil filtration accuracy. However, the flow pulsation is large, the volumetric efficiency is low, the torque is small, and the low speed performance is not good.

They can be divided into two types. One is the single direction gear motor, the other is the bi-direction gear motors. Normally the design of the single direction gear motor is similar to that of the single direction Gear Pump with some slight design differences. Therefore, all GRH pumps have a corresponding single direction gear motor. When placing your order, please refer to the ordering code.

We now focus on the bi-direction gear motors. This motor has a different sealing structure to the single direction motor. The symmetrical sealing (refer to the bottom drawings) separate high pressure from low pressure thus allowing bi-direction operation. The oil from internal leakage returns to tank through the drain port. Normal case drain pressure is limited to 2 bar, but 5 bar is allowed for intermittent operation. High quality of the bushings, bearings and seals adds to the outstanding performance of GRH bi-direction gear motors. 

Characteristics

Direction of rotation: bi-direction and single- direction

Permissible ambient temperature range: min= -20℃-max= +60℃

Operating pressures:input side P1 max = refer above data; outlet side P2 max =3 bar

Drain pressure: max = 2 bar, short time: max = 5bar

Fluid temperature range: max=90℃ for NBR rotary shaft lip-type seal, 100℃ for FKM rotary shaft lip-type seal

Viscosity range: min= 10 mm²/s-max= 600mm²/s

Filtration

Recommended Vicosity range: V=30...45mm²/s

Recommended hydraulic fluids use: GB11118-94 : L-HM46 or equate NFE-603/DIN515524II-85

Specifications

Calculated Formulas

Dimensions