DensoGearbox Design

[One_Degree_North]

Team_4817 - Pre / Season CAD Collection

x3 DensoGearbox _v2

Description-
Looking at the metric ton of Denso throttle motors we have from the past KoPs. I told myself enough was enough, and created a gearbox to make use of these motors.

This can be hugely beneficial to teams that are under-resourced and have a bucket full of these sitting in the corner. Once tested, I have plans to make this kit that teams can purchase while the design remains open to all.

( Let me know what y’all think, feedback will be great! )
Link to Model: x3 DensoGearbox v2.step (5.9 MB)

-Ming, CAD Lead of Team 4817

[jonathano]

How are you interfacing between the motor pinion and the aluminum gears? Don’t the pinions have a spline on them?

[One_Degree_North]

The pinion and gear are both 32 DP.

[AriMB]

For the past number of years, we have been allowed to use two throttle motors connected in parallel to the same motor controller. Of course we don’t know that it will be the same this year, but it’s a good bet. Because of this, it makes sense* to use the throttle motor in pairs of two.

 
* Well for most teams it doesn’t make sense to use throttle motors at all. But it makes even less sense to use an odd number of them.

 
Edit:

@One_Degree_North

The pinion and gear are both 32 DP.

I’m not so sure this is true. Here is the spec sheet linked from the FIRST Choice page. It lists the pinion as 0.75 module. Calculating the diametral pitch from that gives 25.4/0.75 = 33.87dp. So it may mate with the VexPro 32dp gears, but I don’t think it’ll be happy.

[cad321]

Myself and others in the past have successfully mated these motors to 32dp gears in the past. While I haven’t used them for extended periods of time (just little personal projects), they seem to mesh ok. I don’t know how they would fair over the course of an entire season, and this has been with 3d printed gears, so take that as you will.

[One_Degree_North]

Yes, you are correct. I have designs with one to four throttle motors.
I wanted one of them to act as a tachometer :P" ( Just me screwing around )

I found a different one that shows that it was 35dp, not sure why.
But the one that you posted seems more correct in reference to the model.
Will make some changes to the model… Thanks for the info and feedback!

[Ryan_Dognaux]

Oh yes. I can get behind this.

Can confirm the dp is close enough that 32dp gears will work with the throttle pinion. You just may see more wear than usual on them over a season.

Might want a 2 motor version of this as the rules usually allow you to use 2 of them on one speed controller.

You can also run them into a planetary if you want for even more reduction - Throttle Motor Versaplanetary Adapter

Here were the published motor specs I found back when playing around with this -

This motor is really not great for the size, weight and power but we (all teams) sure have a lot of them.

[CalkinsGarrett]

How do you plan to connect power wires to the motors? Having the electrical connection be on the same face as the output is not very fun.

[bobbysq]

It looks like there’s holes in the front of the gearbox for wires to go through. I assume you could either use spade terminals or solder right to the tabs.

[jonathano]

@Ryan_Dognaux

Here were the published motor specs I found back when playing around with this -

This motor is really not great for the size, weight and power but we (all teams) sure have a lot of them.

This is ~0.13Nm of stall torque. With a 1:5 (12:60) reduction, this’ll give ~0.65Nm stall torque with ~1060RPM free speed. While I’m all for using these motors since we all have a huge amount of them, I’d like to know what do you (@One_Degree_North ) have in mind using this gearbox for.