Gerotor Design

Design Process

The Gerotor Design Studio interface is laid out in an easy to use, intuitive format. There are four main forms:

  • Design of the gerotor profile
  • Design of the porting
  • Specification of the fluid and material properties (to enable performance calculations)
  • Inspection of the gerotor and porting prior to converting to CAD models or exporting to CNC machining files

There is also a form for the selection of charts to be plotted or exported to Microsoft Excel.

All of the forms can be resized and moved to suit the designer’s requirements. This is especially useful for the ‘Design View’ form, which can be resized to fill the desktop space available. The layout of the forms can be saved if required (Screen Layout).

Gerotors can be designed using millimeters or inch units. All corresponding outputs will be in the units specified on the main form.

The language used in GDS can be specified as English or German. All outputs (files generated, messages, etc.) will use the selected language.

The main process for designing a gerotor and porting combination is to first design the gerotor, then the porting, calculate the performance and then select the graphical or text file output required. Porting and performance data do not have to be specified if only the gerotor profile is required.

A help file is included for reference and additional guides/information will be published on this website as necessary.

Design Process

The Gerotor Design Studio interface is laid out in an easy to use, intuitive format. There are four main forms:

  • Design of the gerotor profile
  • Design of the porting
  • Specification of the fluid and material properties (to enable performance calculations)
  • Inspection of the gerotor and porting prior to converting to CAD models or exporting to CNC machining files

There is also a form for the selection of charts to be plotted or exported to Microsoft Excel.

All of the forms can be resized and moved to suit the designer’s requirements. This is especially useful for the ‘Design View’ form, which can be resized to fill the desktop space available. The layout of the forms can be saved if required (Screen Layout).

Gerotors can be designed using millimeters or inch units. All corresponding outputs will be in the units specified on the main form.

The language used in GDS can be specified as English or German. All outputs (files generated, messages, etc.) will use the selected language.

The main process for designing a gerotor and porting combination is to first design the gerotor, then the porting, calculate the performance and then select the graphical or text file output required. Porting and performance data do not have to be specified if only the gerotor profile is required.

A help file is included for reference and additional guides/information will be published on this website as necessary.

Gerotors

The gerotor profile can be generated by one of two methods:

1) By specifying all the required parameters as shown in the complete ‘Design Window’ form

2) By only specifying the parameters as shown in the ‘Design Assistant’ sub-for. GDS will then make suggestions for the remaining parameters to allow the design to be finalised. This method is especially useful if the design package is constrained (diameter, thickness, shaft size, etc.) but the detail of the internal parameters is not defined.

Results of gerotor capacity, area ratio and max/min chamber volume are reported to assist the user in further design iteration steps.

Gerotor profiles can be designed by specifying all the necessary parameters (if known), or GDS will create a design for you by specifying a few key parameters. This is especially useful for reverse engineering a Gerotor set to fit an existing housing.

The porting can also be designed from within GDS. Again this can be specified implicitly by the user or it can be designed automatically by GDS. Features such as ‘double sided’ (for improved filling/exhaust) or ‘Shadow porting’ (for rotor balance within the housing) can also be specified. A ‘metering groove’ can also be added which can assist with noise attenuation due to pressure ripple effects.

The Gerotor & porting profiles are shown in the ‘Design View’ Window and can be magnified to see them in more detail; the gerotors can also be rotated to examine how they mesh and interact with the port cavities.

All of these features can later be created as Solid Models or CNC files for manufacture.

Porting Design

The porting design for a Gerotor pump is vital to its operation and efficiency. Optimising the Inlet and Outlet port volumes, sealing arrangements and Porting Types can have major effects on overall pump performance. Gerotor Design Studio gives you control over every aspect of the port design – radii, start and end positions and number of ports can all be defined easily.

However, GDS can also help with this process by clicking the ‘Design Ports’ button with blank fields – default values will be entered automatically.

Porting Type – Double-Sided Inlet or Outlet (for improved filling and exhaust) can be specified, as can Shadow Ports (small depth ports to create a balancing effect for the rotors in the housing).

A Metering Groove can be defined (if required) to assist in the transition from Low Pressure (Inlet) port to High Pressure (Outlet) port, where backflow of the high-pressure fluid can create ripples and generate noise.

The rotors can be rotated within the ‘Design View’ form, to see the interaction between gerotor chambers and the port sealing lands.

Porting Design

The porting design for a Gerotor pump is vital to its operation and efficiency. Optimising the Inlet and Outlet port volumes, sealing arrangements and Porting Types can have major effects on overall pump performance. Gerotor Design Studio gives you control over every aspect of the port design – radii, start and end positions and number of ports can all be defined easily.

However, GDS can also help with this process by clicking the ‘Design Ports’ button with blank fields – default values will be entered automatically.

Porting Type – Double-Sided Inlet or Outlet (for improved filling and exhaust) can be specified, as can Shadow Ports (small depth ports to create a balancing effect for the rotors in the housing).

A Metering Groove can be defined (if required) to assist in the transition from Low Pressure (Inlet) port to High Pressure (Outlet) port, where backflow of the high pressure fluid can create ripples and generate noise.

The rotors can be rotated within the ‘Design View’ form, to see the interaction between gerotor chambers and the port sealing lands.

Design & Manufacture Services

In addition to providing the GDS software, we are able to offer design & manufacturing services for both gerotors and porting.

We work with you to provide the best design solution based on your requirements for performance, packaging, and cost of manufacture.

If you would like to take advantage of this service, please contact Simon Baron-Oxberry directly for more information at simon@gerotordesignstudio.com

We are also able to manufacture prototype parts for evaluation, testing or small-scale manufacture. Contact us for more information about this service, or see our Prototypes

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