Parker Gear Motor

Parker Gear MotorBasic Information:

withPGMThe series is mainly composed of fixed displacement and external gear structure, focusing on high pressure, high efficiency, high reliability, and low pulsation, covering all scenarios from micro to heavy-duty, with displacement0.465–147.5 cc/revPressure170–350 barHigh efficiency98%Below is a complete technical and application explanation by series.

The core principle of hydraulic gear motors (commonly known as external meshing) is that high-pressure hydraulic oil enters the cavity of the meshing gear, uses the pressure difference on the tooth surface to generate torque, drives the gear to rotate, and converts hydraulic energy into rotating mechanical energy for output.

1、 Core structure (external meshing type)

A pair of meshing gears (drive wheel)+Driven wheel)

Shell (forming a sealed working chamber)

Front and rear end caps (sealing, oil distribution, support shaft)

Output shaft (coaxial with the driving gear, outputting torque externally)

enter/Oil outlet (symmetrical design, can rotate in both directions)

2、 Work process (one-step approach)

Oil inlet and chamber establishment

High pressure oil enters the high-pressure chamber on one side of the gear meshing area from the oil inlet, filling the enclosed space enclosed by the tooth groove, housing, and end cover.

Pressure difference generates torque

The effective force radius at the meshing point is smaller than the radius of the tooth tip circle, resulting in a compressed area on the high-pressure side tooth surface>Low pressure side compression area.

Hydraulic pressure creates an unbalanced torque at the center of the gear, pushing the gear to rotate in a fixed direction.

Continuous rotation and oil discharge

When the gear rotates, the volume of the high-pressure chamber continuously expands, and high-pressure oil is continuously sucked in; The volume of the low-pressure chamber continues to shrink, squeezing the oil out of the outlet (low-pressure side).

The meshing point continuously moves, and the torque and speed are continuously output; As long as the oil supply continues, the motor will continue to rotate.

energy conversion

The pressure energy of hydraulic oil→The rotational mechanical energy (torque) of gears+Speed), driven by the output shaft to load.

3、 Key characteristics

Speed: determined by the input flow rate (the higher the flow rate, the higher the speed).

Torque: determined by the working pressure difference (the larger the pressure difference, the greater the torque).

Bidirectional rotation: switch in/The oil outlet can be reversed without the need for additional structure.

Torque ripple: Due to changes in the position of the meshing point, there are periodic fluctuations in the output torque, and the low-speed stability is average.

The structure is simple, impact resistant, and cost-effective, but the volumetric efficiency and low-speed performance are relatively average.

4、 Difference from gear pump (in one sentence)

Gear pump: Input mechanical energy from the active shaft→Oil absorption, oil pressure, and output of high-pressure oil (mechanical energy)→Hydraulic energy).

Gear motor: High pressure oil input hydraulic energy→Drive the gear to rotate and output torque (hydraulic energy)→Mechanical energy).

ParkerHydraulic gear motor（PGMThe series is mainly divided into micro models based on displacement, material, and pressure/Three major categories: small, medium, and heavy, covering0.465–147.5 cc/revPressure170–350 barHere are the complete models and parameters:

Parker Gear Motorworking principle

1、 Miniature/Small gear motor (cast iron)/Aluminum alloy, light load/Medium load)

1. PGM030/031/050/051/075/076Series (cast iron, miniature)

Displacement:0.465–7.6 cc/rev

Stress170–210 bar

Speed: High3000 rpm

Model:PGM030ThePGM031ThePGM050ThePGM051ThePGM075ThePGM076

2. PGM500Series (aluminum alloy, lightweight,Group 1/2）

Model:PGM503ThePGM505ThePGM511ThePGM517

Displacement:3.3–16.7 cc/rev

Stress210–240 bar

Speed: High3600 rpm

Features: Light weight, high efficiency, suitable for small construction machinery and agricultural machinery

2、 Medium sized gear motor (cast iron, medium high pressure, universal main force)

1. PGM300Series（315/330/350/365, Universal for medium and high voltage)

PGM315: Displacement7.6–40.6 cc/rev, pressure241 bar, traffic121 L/min

PGM330: Displacement10.2–50.8 cc/rev, pressure241 bar, traffic151 L/min

PGM350: Displacement21–105 cc/rev, pressure241 bar, traffic250 L/min

PGM365: Displacement44–147.5 cc/rev, pressure241 bar, traffic354 L/min

Speed: High2400–3000 rpm

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