Romax Gear Design Software Free Download
Olegario Benford
The project presents a two speed transmission. Design requirements for the transmission state that it must have two forward gears and two reverse gears, be compact, be quiet, and have a collinear design. Also, the design must last for 1600 hours at each gear for a combined life of 6400 hours between 750 and 1250 rotations per minute (RPM) with a power input of 32 horsepower. The output shaft must rotate at 85% (1%) and 65% (1%) of the input speed in the input direction, and 60% (1%) and 50% (1%) of the input speed in the opposing direction. The design chosen consists of an input shaft, counter shaft, idler shaft, and an output shaft assemblies which were all designed using helical gears, tapered roller bearings, and radial ball bearings. Validation of the gears, bearings, and shafts were done using RomaxDesigner software. Analysis of the duty cycle summary for the final design shows design failure shortly after the required combined life of 6400 hours.Read less
Engineers involved in the development of geared electro-mechanical systems have ever-evolving requirements when it comes to the use of design and analysis software. These include the need for improved modelling and analysis productivity with reduced modelling errors, higher fidelity simulations delivering increased accuracy, and the need for a greater breadth of capabilities to enable the design of new applications using a wider range of materials. Gears are some of the most complex, yet critical components in these systems and are a constant topic of discussions and area of innovation.
Here at HxGN System Dynamics we have been busy extending the capabilities of Romax software for design, modelling and analysis of gears and complex geared systems. Watch this webinar series for an introduction to the gear design and analysis capabilities of Romax with a focus on the latest features.
A streamlined interface for loading and concept level helical gears, allowing the definition of concept level asymmetric gears and a comprehensive gear design and rating approach for detailed gears considering manufacturing tolerances
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It is widely acknowledged that there is a disconnect between design engineers and the production department or supplier, which in some cases can significantly increase the development times and costs. Such is the case with gears, which are highly sensitive to even micron-level deviations in their system performance. The tooth geometry determined by the design engineer often cannot be produced precisely as specified. Even small adjustments made by the manufacturer due to the limitations or intricacies of the manufacturing method can invalidate the design intent. This is exacerbated by manufacturing variability, which adds further uncertainty.
The impact of gear manufacturability can be severe. If unwanted deviations are found during production, the options to fix this are limited. If the tooling has already been purchased, retooling is expensive and would mean wasted costs on the original tooling. Alternatively, manufacturers can correct for unwanted errors during production, but this can take considerable time, slowing down the production with long cycle times, and requiring additional manufacturing processes and specialist tools and machines that can incur significant extra costs. In certain cases, a late-stage redesign may be required which can lead to long project delays. It is far less expensive and far quicker to resolve these issues during the design stage as opposed to the manufacturing or production stages.
Unlike other solutions, being fully integrated into Romax and automatable, the accurate gear geometry is always considered in the context of the full drive system for durability, NVH, and efficiency analysis; it is very easy to use, and it can be run as part of parametric studies or in batch mode.
With the right tools, the concept design stage can be an opportunity to analyse ideas, gather insights and even validate requirements. Romax Concept empowers experts and non-experts to get the most out of the initial phases of a design project.
Import existing drivetrain models via REXS, export to CAD to save time tweaking 3D geometry after each design change, export to ADAMS for multi-body dynamics simulation, and export to other Romax products for further analysis and detailed component design.
Romax Concept is the true starting point for model creation, with an incredibly easy to use interface that anyone can learn in a few hours. Build parametric models of any full drive system rapidly (in minutes), with a drag-and-drop 2D modelling interface and a live reflection of the model in 3D visualisation.
Looking for inspiration?
A database of design templates is available in Romax Concept. Create a new model from any template to save time. Templates can be scaled up and down to match your application. Users can save custom templates for common layouts to save modelling time and to re-use designs in other drivetrain engineering projects.
Are your drivetrain designs in another software package?
Romax Concept supports the REXS file format for importing and exporting models. Bring your gear geometry or gearbox design into Romax Concept to analyse straight away without re-modeling. Then, convert to Adams for multi-body dynamics simulation with ease.
Are you spending a lot of time tweaking a drivetrain CAD model?
To facilitate using Romax Concept alongside CAD, transferring 2D and 3D geometry between CAD and Romax Concept could not be easier. Automatically generate CAD geometry from your Romax Concept model in seconds, eliminating the need to tweak CAD following a design change. With Romax CAD Fusion, models can be imported into Romax Concept from all major CAD packages. Import structures such as housings, mounting points, controls and more as reference geometry for packaging studies in Romax Concept.
Romax Concept offers a range of analyses suited to the early design stage, so you can get rapid insights on your design concepts and make well-informed engineering decisions. Analyses run in seconds and key results can be reported in simple, sharable formats.
As with the rest of the Romax portfolio, the simulation considers the full system holistically, including the cumulative effect of the complex interactions between all components, deflections, loads, stresses and misalignments.
Once you have got the answers you need from Romax Concept, and have completed the design iteration process, you can move it into the rest of the Romax portfolio for more in-depth assessment of durability, NVH and efficiency performance.
Creating models in Romax Concept is perfect for initial assessment of shaft centre distancing, gear sizing, packaging space, gear selection and simultaneous ratio optimization of individual gearsets. Users can iterate these activities to meet a number of different competing requirements.
Designing gears in Romax Concept is easy with its intelligent set of design tools. The staged gear design process in Romax Concept guides gear definition from simple speed ratios, to basic gear teeth/module, to fully defined gear set geometry.
For ratio selection, the saw profile diagram helps to achieve equally spaced gear ratios for a more continuous vehicle acceleration and better fuel economy at all speeds. The ratio optimisero ptimises the gearbox ratios and required gear size, according to targets specified, which can be either user-inputs or automatically generated.
For gear sizing, the K factor sizing method intelligently sizes parallel and planetary gears for a given application based on benchmarked data. Toothless gears can be used to set up load cases and estimate packaging concerns.
For gear rating, Romax Concept can automatically estimate your gear geometry based on size, ratio, and module to allow for preliminary rating. International rating standards are included in Romax Concept for assessing damage/life, power losses and more.
For gear geometry, the gear set designer is a powerful, automated multi-attribute gear macro geometry optimisation tool. Specify design criteria, generate gear designs, rank geometries by analysing and scoring their safety factors, transmission error and more.
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