Truck/SUV axle ratios
Truck/SUV axle ratios
(OP)
Hello i am triyng to find information about what would be a common gear ratio for the bevel gears inside a tipical truck / Suv Axle,
i am designing a toy truck axle similar to this
http://ho metown.aol .de/scaleo ffroad/vor derachse_2 _offen.jpg
any help apreciated
thanks
i am designing a toy truck axle similar to this
http://ho
any help apreciated
thanks





RE: Truck/SUV axle ratios
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RE: Truck/SUV axle ratios
5:1 is huge reduction, i wonder how can they put gears with such ratio inside a not big diffbox ....
please check this pic, i dont think there is room for more than 2:1 in there
http:
RE: Truck/SUV axle ratios
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Truck/SUV axle ratios
RE: Truck/SUV axle ratios
i am making a 1:10 scale axle so the size of teeth must be really small, but there is a limit , i cant make them too small because they are hard to manufacture and also because of precision loose issues
what do you think is better for high torque? , lets say i have two pinion/spur sets with same ratio , and same gear diameter, but diferent teeth size , for example:
smaller teeth with 13T pinion - 40T spur (3.07:1)
bigger teeth with 9T pinion -27T spur (3:1)
the goal is to have a nice mesh and high torque gears
i assume that bigger teeth are better for high torque but will 9T pinion give a nice mesh?
RE: Truck/SUV axle ratios
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Truck/SUV axle ratios
RE: Truck/SUV axle ratios
i see why integer values can create wear problems, but about the wear created by less than 13 teeth , why this happens exactly ? is it because not smooth mesh?
RE: Truck/SUV axle ratios
RE: Truck/SUV axle ratios
RE: Truck/SUV axle ratios
RE: Truck/SUV axle ratios
now i wonder , is there a reason in making such big reduction in the axle and not in another point in the transmission train?
RE: Truck/SUV axle ratios
The further back in the drive line the torque is multiplied, the lighter the components can be.
If you do it in the gearbox, the gearbox, tail shaft, universal joints, pinion and pinion carrier would need to be heavier.
Regards
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RE: Truck/SUV axle ratios
"The further back in the drive line the torque is multiplied, the lighter the components can be."
not sure if i am right cause my english is not so good , but it doesnt make sense to me in the way it is said
RE: Truck/SUV axle ratios
If the diff is 3:1 the crown wheel axles etc see 3 times the torque of the tail shaft.
If the gears in the gearbox were all 3 times lower and the diff were 1:1, then everything from the first motion shaft back would need to be able to withstand 3 times the torque loading.
Regards
eng-tips, by professional engineers for professional engineers
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RE: Truck/SUV axle ratios
im sure we are talking about the same thing but i still dont get your first sentence as if torque is bigger , gears should be heavier , not lighter
i gues i am getting it wrong because my bad english , sorry
RE: Truck/SUV axle ratios
Deep ratios are used in modern times by off roaders with the real tall tires that created the need for lift kits.
The typical 4wd truck/jeep transmission has a "low" range for off road work. Ratio is something like 2 or 2.5 to 1.
http://www.novak-adapt.com/knowledge/model_18.htm
RE: Truck/SUV axle ratios
RE: Truck/SUV axle ratios
Power train after the needs to be heavier as it needs to handle the multiplied torque.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Truck/SUV axle ratios
3.55 to 1
4.10 to 1
I'd say a good range is 3.07 to 4.11 is very typical for light truck rear axle ratio's.