![ring gear template generator ring gear template generator](https://woodgears.ca/gear_cutting/no_canvas.png)
If you place a gear inside another gear, with the internal gear having a tooth count of half the ring gear’s tooth count, any point on the pitch diameter of the inside gear will move back and forth in a straight line. That is to say, the angle between planet gears is a multiple of 360/(R+S).įinally, here’s another cool arrangement of gears, though not really a “planetary” gear set. The angle between the planet gears about the sun gear is however still constrained by:Īngle p2p = 360 / ( R + S ) × N 123412Where N is a whole number If however you are willing to space the planets unevenly, this constraint does not apply. ( R + S ) is evenly divides by the number of planets. If you want the planetary gears to be evenly spaced, and all be engaging the next tooth at the same time, then both your sun and your ring gear needs to be evenly divisible by the number of planets.If you want them to be evenly spaced, but don’t need them to all be in the same phase with respect to their teeth, then then the sum of the ring gear’s teeth and the sun gear’s teeth must be evenly divisible by the number of planets. Now, if we drive the sun gear, we can rearrange the formula to solve for turns of the Y carrier:Ĭonstraints on number of teeth and planets So we can remove those terms from the above formula, and we get: ( R + S ) × T y = T s × S For example, if we hold the ring gear in a fixed position, T r will always be zero. Now, usually in a planetary gear, one of the gears is held fixed. The turns ratio is as follows : ( R + S ) ×T y = R × T r + T s × S Example: Turns of the planetary gear carrier (the Y shaped thing in the previous photo) Working out the gear ratio of a planetary gear train can be tricky. Pitch diameter can also be calculated as tooth spacing * number of teeth / (2*π), where 2*π = 6.283
#Ring gear template generator generator#
The gear generator program tends to refer to tooth spacing. The pitch diameter of a gear is just the number of teeth divided by diametrical pitch (larger values of “diametrical pitch” mean smaller teeth).
![ring gear template generator ring gear template generator](https://woodgears.ca/gear/screenshot.png)
If you go into the gear generator and select “show pitch diameter”, you can see how the pitch diameter is just a circle that the teeth are centered over. The teeth would stick out beyond the line of the wheel as much as they indent, so that the pitch line of the gears would be the line around the gears.
#Ring gear template generator plus#
From the illustration at left, you can see that the diameters of the sun gear, plus two planet gears be must equal to the ring gear size.Now imagine we take out one of the green planet wheels, and rearrange the remaining ones to be evenly spaced. to get the module of the second stages gears, multiply the first stage module of your choice with the module multiplier.This can be made more clear by imagining “gears” that just roll (no teeth), and imagine an even number of planet gears.
![ring gear template generator ring gear template generator](https://d2t1xqejof9utc.cloudfront.net/screenshots/pics/6587cf242279f4d98b4e540307681973/large.png)
A compound planetary gear consists of multiple simple planetary gears in so-called "Stages".
![ring gear template generator ring gear template generator](https://www.researchgate.net/profile/Lotfi-Baghli/publication/224189149/figure/fig7/AS:668555016151056@1536407345930/Sun-planet-and-ring-gears-free-body-diagram-a-Sun-gear-b-Planet-gear-c-Ring-gear.jpg)
A simple planetary gear consists of a ring gear, a sun gear, and multiple planet gears, where typically the sun is the input and the planet carrier is the output. This is a generator for simple planetary gears and compound planetary gears.