Planetary gearing is a compact different to straightforward pinion-and-gear reducers and is utilized in all kinds of purposes to offer excessive torque. We’re going to go over the setup of a planetary gear meeting in SOLIDWORKS that can permit us to reveal the movement of the three drive forms of this technique.
To arrange our planetary gear system, first we’ll insert the entire obligatory elements into a brand new meeting doc:
- 3 x planet gears (blue)
- 1 x solar gear (orange)
- 1 x ring gear (black)
- 1 x provider
- 3 x provider shafts
- 1 x solar shaft
In every of the gear half recordsdata, pitch circles have been created as building circle sketches. The Ring gear has a further building circle drawn to information the trail of the Planet gears. This will likely be key to right movement and will likely be known as the Planet Gear Path.
To start out assembling the gear system, we’ll mate the again face of every gear Coincident to the Entrance Aircraft of the meeting (be sure that not one of the components 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 aircraft 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 have the ability to spin.
Subsequent, mate the middle of the pitch circles of the Planet Gears coincident to the Planet Gear Path sketch.
Now, mate the Provider shafts to the facilities of every Planet Gear (Concentric) and flush with their entrance faces (Coincident).
Get the Provider in place by including Concentric mates to every Provider Shaft, and one Coincident mate to convey 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 truly obligatory to point out the movement we’re after). We wish the Solar shaft to rotate with the Solar gear, so we may also mate Reference Planes along with the Coincident mate to hyperlink the rotation of the 2 components.
Now we’re prepared for the Gear mates. Choose the Pitch circles drawn on every gear to outline the Gear mates. This can outline the gear ratios, although cylindrical faces on the gears is also used and ratios might 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, remember to take a look at every and make sure that the spin instructions are right. Use the Reverse checkbox within the Mates Property Supervisor to repair if obligatory. Additionally, don’t worry about making the gear tooth mesh accurately (we’ll 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’ll make one other group of mates to assist place the gear tooth accurately, this may be completed 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 Prime 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 critical. Don’t overlook so as to add a further mate to align the Provider. Group these mates right into a folder as effectively. 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 will likely be fastened in place, earlier than fixing any part remember to unsuppress the alignment mates to make sure these elements are within the right place after which suppress the alignment mates as soon as once more. Add a configuration known as “Ring Gear Mounted.” Proper-click the Ring Gear and choose Mounted, This Configuration solely.
To check movement, rotate the planetary gears by the Provider for greatest outcomes.
For the second configuration, copy and paste the Default Configuration and rename it “Solar Gear Mounted.” Align the gears and repair the Solar Gear on this configuration solely.
Repeat the method, naming the third configuration “Provider Mounted” and repair the provider 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. Keep in mind that the gear tooth would not have to mesh accurately for the movement of the planetary gear system to be noticed, although it’ll have an effect on analysis instruments comparable to interference detection.
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