Planetary gearing is a compact different to plain pinion-and-gear reducers and is utilized in all kinds of functions to offer excessive torque. We’re going to go over the setup of a planetary gear meeting in SOLIDWORKS that may enable us to display the movement of the three drive kinds of this technique.
To arrange our planetary gear system, first we are going to insert the entire essential parts into a brand new meeting doc:
- 3 x planet gears (blue)
- 1 x solar gear (orange)
- 1 x ring gear (black)
- 1 x service
- 3 x service shafts
- 1 x solar shaft
In every of the gear half recordsdata, pitch circles have been created as development circle sketches. The Ring gear has a further development circle drawn to information the trail of the Planet gears. This might be key to appropriate movement and might be referred to as the Planet Gear Path.
To begin assembling the gear system, we are going to mate the again face of every gear Coincident to the Entrance Airplane of the meeting (guarantee that not one of the elements are fastened in-place, if that’s the case right-click the half and choose Float). To hurry up this course of, use the A number of Mate Mode button, and choose the Entrance airplane because the frequent reference.
Subsequent, mate the middle of the pitch circles on the Ring Gear and Solar Gear to the Meeting origin, they need to each be capable to spin.
Subsequent, mate the middle of the pitch circles of the Planet Gears coincident to the Planet Gear Path sketch.
Now, mate the Service shafts to the facilities of every Planet Gear (Concentric) and flush with their entrance faces (Coincident).
Get the Service in place by including Concentric mates to every Service Shaft, and one Coincident mate to carry it flush with the again of one of many shafts.
Lastly, mate the Solar Shaft into place with one other set of concentric and coincident mates (this half just isn’t really essential to point out the movement we’re after). We would like the Solar shaft to rotate with the Solar gear, so we may even mate Reference Planes along with the Coincident mate to hyperlink the rotation of the 2 elements.
Now we’re prepared for the Gear mates. Choose the Pitch circles drawn on every gear to outline the Gear mates. It will outline the gear ratios, although cylindrical faces on the gears may be used and ratios may be manually overwritten. Add Gear mates between the three Planet gears and the Ring gear and one gear mate between a single Planet gear and the Solar gear (that is all that’s wanted for the whole gear movement). Whereas making the Gear mates, be sure you check every and be sure that the spin instructions are appropriate. Use the Reverse checkbox within the Mates Property Supervisor to repair if essential. Additionally, don’t worry about making the gear tooth mesh accurately (we are going to repair this subsequent.)
To group the gear mates right into a folder: shift-select the Gear mates, right-click, and choose Add to New Folder. Drag it to the highest of the Mates folder for ease of entry.
Subsequent, we are going to make one other group of mates to assist place the gear tooth accurately, this may be accomplished by creating Parallel (or Angle) mates between reference planes on the gears and reference planes on the meeting. Relying on how the gears had been created, this could get the tooth to mesh accurately, on this meeting the High planes are aligned with tooth and the Entrance planes aligned with gaps, so getting exact alignment is well attained with parallel mates. Utilizing mates for the alignment is preferable to dragging them into place as a result of they can be utilized sooner or later if realignment is important. Don’t neglect so as to add a further mate to align the Service. Group these mates right into a folder as properly. As soon as aligned, suppress the whole folder.
Now it’s time to create configurations for the three modes of motion. For every configuration a part might be fastened in place, earlier than fixing any part be sure you unsuppress the alignment mates to make sure these parts are within the appropriate place after which suppress the alignment mates as soon as once more. Add a configuration referred to as “Ring Gear Fastened.” Proper-click the Ring Gear and choose Fastened, This Configuration solely.
To check movement, rotate the planetary gears by the Service for greatest outcomes.
For the second configuration, copy and paste the Default Configuration and rename it “Solar Gear Fastened.” Align the gears and repair the Solar Gear on this configuration solely.
Repeat the method, naming the third configuration “Service Fastened” and repair the service solely in that configuration.
If at any level after switching configurations the gear tooth don’t mesh accurately, first suppress the gear mates after which unsuppress the alignment mates. After the gears are realigned, you may as soon as once more suppress the alignment mates and unsuppress the gear mates. Do not forget that the gear tooth don’t have to mesh accurately for the movement of the planetary gear system to be noticed, although it’s going to have an effect on analysis instruments corresponding to interference detection.
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