Modeling gears in SolidWorks. Plymouth （建模在SolidWorks齿轮。）.pdf

Modeling gears in SolidWorks. This session will look at methods of creating solid models of gears as individual parts and how they can be mated in an assembly, to simulate motion behavior. We will consider a simple example of a pair of spur gears with a speed ratio of 2:1. We will use items from HPC Gears Ltd. part nos. YG4-34 YG4-68. Download and extract the gears.zip file for the initial parts to start working with. http://www.tech.plymouth.ac.uk/dmme/cad/cad_files/gears.zip Gears Page 1 of 4 Gears can be individually modeled as parts using various approaches: 1 Gear modeling - simplified geometry (no teeth). 1.1 Simplest. The simplest approach is to model the gears as if they are wheels, with outside diameters equal to their pitch diameters, as has been done in the parts provided in gears.zip. In the assembly file the gears have been assembled to allow them to freely rotate. To simulate the driving effect of gears you can apply a gear mate: Mate Advanced mates Gear Simply select the outside surfaces of each spur gear. Observe how the sizes are automatically entered in the gear mate parameters. You can of course manually change these values. The gears do not have to touch. They would be spaced apart if they are, for example, pulleys for a belt drive system. In this case you may have to select the Reverse option to make the pulleys rotate in the same direction. This approach results in a solid model representation of the gear. The model will approximately represent both the overall ‘space claim’ of the component and the correct drive ratio in the assembly motion simulation. 1.2 Slightly less simple, with correct OD. To model the correct OD (outside diameter) of the spur gear and still have model geometry representing the pitch diameter you will need to add an extra feature for the pitch diameter in each gear model. One way to do this is to chan