Automatic Transmission Model
by emmett
Printable files (21)
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stlgears.stl
2.1 Mo · 143 028 downloads
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stlplanets.stl
2.4 Mo · 141 088 downloads
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stlstand.stl
135 Ko · 139 864 downloads
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stlshaft.stl
689 Ko · 139 549 downloads
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stlcrank.stl
128 Ko · 139 112 downloads
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stlpins.stl
94 Ko · 139 286 downloads
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stlhandle.stl
87 Ko · 138 906 downloads
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stlcarrier.stl
721 Ko · 139 027 downloads
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stlanulus.stl
4.2 Mo · 138 750 downloads
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stlsun.stl
1.7 Mo · 138 609 downloads
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stlidler.stl
603 Ko · 138 139 downloads
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stlplanet1.stl
794 Ko · 138 008 downloads
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stlplanet2.stl
1.2 Mo · 137 958 downloads
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stlback.stl
121 Ko · 137 681 downloads
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stlfront.stl
119 Ko · 137 573 downloads
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stlbrace.stl
102 Ko · 137 563 downloads
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stlpin1.stl
117 Ko · 137 356 downloads
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stlpin2.stl
119 Ko · 137 248 downloads
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stlpin3.stl
111 Ko · 137 334 downloads
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stlback_loose.stl
127 Ko · 137 201 downloads
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stlfront_loose.stl
125 Ko · 137 044 downloads
Description
Have you ever wondered how an automatic transmission works? I did, so I looked it up and then designed this desktop model. It has six forward speeds and one reverse. Real automatic transmissions have a hydraulic or electrical system that engages different clutches and brakes to shift gears depending on the driving situation. With this model you control those simplified brakes and clutches yourself.
The clutch is actuated by sliding the drive shaft through to different positions (which each have two gear markings), while three separate brakes each also have two gear markings. You select a gear by engaging the brake and clutch position associated with your desired gear. See demonstration video: http://www.youtube.com/watch?v=-FyC3dn3HJY
I tried to design the gear ratios to be fairly close to what some real cars use, and this is the result, where the input is the crank and the output is the annulus:
1st gear: 1 : 4.29
2nd gear: 1 : 2.5, 71% increase
3rd gear: 1 : 1.67, 50% increase
4th gear: 1 : 1.3, 28% increase
5th gear: 1 : 1, 30% increase
6th gear: 1 : 0.8, 25% increase
Reverse: 1 : -3.93
The OpenSCAD file is included and is highly parametric in case you'd like to play with different gear ratios. If you select a different number of teeth, it will print out the resulting gear ratios at the beginning of the output. I also used Matlab to investigate more thoroughly how the gear sizes affected the various ratios. I used transmission.m as an aid in optimizing the ratios to be somewhat evenly spaced.
This was all printed in PLA at 120 mm/s on a Replicator 1 with Sailfish firmware, default layer height (0.27mm). Everything came out perfectly on the first print. I swear, complex models don't have to be difficult, and who needs glue when you can print snap-fits?