Y: Gear Shaft Design - Calculations/Selections and AutoCAD Drawing

[kevinlam87]

Design the shaft assembly of gear 2 with the following information:

Gear:
The specification of the involute helical gears are as follows
Pressure angle: 20 degrees
Torque acting on gear 1, T1= 95500Nmm
Number of teeth: N1= 55(gear1), N2=135(gear 2)
Helix angle= 15 degrees
Tooth Width b= 50 mm
Gear quality grade:8
Input speed n1=1450rpm
Machine for power input: electrical motor
Machines to be driven by the motor: push press drive
Tooth Surfaces of both gear 1 and 2 are soft
Material of both gears is steel
Allowable contact stress= 570N/mm2
Allowable bending stress= 380 N/mm2

Requirement:
Detail the following calculation/ selections
1) Gear Ebnding and contact stresses
2) Bearing selection
3)Key and key way design


I don't get how u can find out the module(m), I been trying to do it for days and I just can't work my way around it, please help me...my dealine is in 2 days time and I also need to produce a Auto CAd drawing too!

KEv

 

[TVP45]

You could start with Machinery's Handbook, a visit to the Boston Gear site, and also a visit to the SDPSI site to get some ideas about the gear. For the bearings, I recommend the SKF site and one (several) of the standard machine design books, as well as Machinery's Handbook.

Good luck.

 

[kevinlam87]

i think i have determint the module...I run into a problem though...I tried to work out the dynamic factor so I could apply into the eqution...the graph infront of me doesn't show the dynamic factor for grade 8 quality as it ran out

 

[onurengin]

how to choose appropriate shaft

Hi,
I need to build a kind of a test device for bicycle rims. Already attached some pictures of the design. The problem is I'm not a mechanical engineer and don't know what the principles for choosing the right shaft.

There is a big metal drum placed in a frame and it is going to be 130cm diameter nearly 320kg. The rims going to be placed on the yellow tilting mechanism. By applying load ( 50-100 kg on each arm)to red arms and turning the drum, rims will be tested. I will use an electrical motor which is placed outside of the frame and the transmission is going to be with a belt. This is the basic idea. However I don't know how to calculate the diameter of the drum shaft that I need.
I already checked the google and try to find out something similar to that "device" but couldn’t find it. There are lots of information like bending moment and torque but they are not that much easy for me to understand. I hope u guys help me.