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 Post subject: Inboard Brakes
PostPosted: November 2, 2018, 7:58 am 
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Joined: March 17, 2007, 5:59 pm
Posts: 26
I have been thinking about a midi bec that is awd, kind of like the R1ot. I know there is a lot going on in this idea, but it made me think about inboard brakes. What if you would mount the brakes on the input of the diffs? Would that work? Is this a horrible idea? I was thinking you would have one rotor and caliper each for both front and rear. I think you could go smaller as the force would be multiplied through the diff. Am I off my rocker? I would love to hear your thoughts, criticisms, etc.

Vince


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 Post subject: Re: Inboard Brakes
PostPosted: November 2, 2018, 10:17 am 
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Joined: June 13, 2014, 11:55 am
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hotmalevb wrote:
I have been thinking about a midi bec that is awd, kind of like the R1ot. I know there is a lot going on in this idea, but it made me think about inboard brakes. What if you would mount the brakes on the input of the diffs? Would that work? Is this a horrible idea? I was thinking you would have one rotor and caliper each for both front and rear. I think you could go smaller as the force would be multiplied through the diff. Am I off my rocker? I would love to hear your thoughts, criticisms, etc.

Vince



Brakes wok by converting friction into heat, heat dissipation is already bad with two rotors per axle inboard arrangement.
If you reduce the number of rotors, you´d need to increase its size to maintain heat dissipation capacity, therefore you´d have to have very large diameter discs with very heavy calipers to suit.
For a low speed vehicle it would be OK in my opinion.


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 Post subject: Re: Inboard Brakes
PostPosted: November 2, 2018, 6:23 pm 
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Joined: December 22, 2006, 2:05 pm
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Another factor is that if one wheel loses traction at any moment, all braking is lost if an open diff and most of it with limited slip. How much depends on the type. Scary stuff.

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 Post subject: Re: Inboard Brakes
PostPosted: November 2, 2018, 6:55 pm 
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Fairly common for PARKING brakes.
For main brakes, I would say no.

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 Post subject: Re: Inboard Brakes
PostPosted: November 2, 2018, 7:31 pm 
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I don't understand how brake placement on the axles can cause the above.

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 Post subject: Re: Inboard Brakes
PostPosted: November 3, 2018, 5:26 am 
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KB58 wrote:
I don't understand how brake placement on the axles can cause the above.


He's suggesting having brakes on the pinion with no brakes on the axles to save weight and reduce the clamping ability (commensurate with the ratio of the diff) to be adequate for both wheels. I do not fully follow the heating argument but I haven't thought much about it. Just making my own point.

My P32 bread truck has the parking brake drum on the transmission output shaft, so I have to definately chock the far/other wheel(s) in both directions when jacking, to prevent it rolling off.

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