[MOC] 4x4 retro car help

[Splat]

That clutch gear is typically used in situations where the output can get stalled.  The clutch gear allows the input to keep turning (such as a motor), while the output is stalled, so that the motor doesn't get stalled and overheat.

Some examples could be for steering where you can only steer so far, or for cranes where they can only rotate a certain amount.

You need to put them in the correct location in the drivetrain for them to be most effective.

One good way to see how these are used is to look them up on BrickLink/BrickOwl/Rebrickable, and then see which sets they come in, and then go to the Lego website and download the instructions for those sets so that you can study where and how they are used.

[Un_Dac]

Ok, thanks. I think I got it. It's a protection for the motor. I'll study some instructions. 

I've seen it in the power function set 8293, that's why I asked.
I have the 42065 set with two M motors, however I don't have that piece. The motors in the set are connected directly to the tracks.

I'm trying to make a whish list of parts most commonly used to order them. I'll study also some steering layouts so I don't have to improvise in the future.

One more question: in order to have multiple motorized functions I need more battery boxes or is there a way to connect 3 or more motors to a single battery box?

For example, the one that I have its one battery box > IR receiver > and I can connect 2 motors.

If, I want to add 2 more motors, I need to add another separate battery box?  Because this will increase the weight of the build significantly

[Boulderer]

You can stack the motor connectors on top of each other to add more motors.  However, you need to make sure that the total load doesn't exceed the limit of the battery box, or the IR receiver.  If this happens the setup will cut out to protect the equipment.

[Splat]

As @Boulderer mentioned, you can stack any of the Power Functions connectors.  So (for example) you can have:

• two IR Receivers coming off a single Battery Box allowing 4 individually controlled remote channels, or
• you can have one IR Receiver coming off a Battery Box, but then have multiple motors coming off each of the IR channels, so you can use two motors on one channel to drive, and another motor on the other channel to steer, or
• many other combinations.

If you are new to Power Functions, it is worth it to read Lego's Power Functions FAQ page: https://www.lego.com/powerfunctions/faqs

If you want even more information about the different motors, I recommend reading Philo's Motors page: http://www.philohome.com/motors/motorcomp.htm

Edited December 21, 2017 by Splat

[Boulderer]

Thank you @Splat, I couldn’t remember the link to philo’s page. 

[Un_Dac]

Progress update. this is the final version of the steering, big thx to Jurss for the help:

steering works great, the angles are very wide and the suspension is a litle wobbelly but it works fine.

For the rear suspenison, I used a four arm system for each wheel. This allows the wheel to stay perpendicular with the ground at all times regardless if the suspension load. I know I used a yellow suspension instead of a grey one, and that the left suspension is much stiffer, but I only have seven grey suspensions for now.

Overall, I'm happy how it came out: