The figure shows a double-reduction helical gearset. Pinion 2 is the driver, and it receives a torque of 2120 lbf. in from its shaft in the direction shown. Pinion 2 has a normal diametral pitch of 8 teeth/in, 14 teeth, and a normal pressure angle of 20 and is cut right-handed with a helix angle of 30°. The mating gear 3 on shaft b has 36 teeth. Gear 4, which is the driver for the second pair of gears in the train, has a normal diametral pitch of 5 teeth/in, 15 teeth, and a normal pressure angle of 20° and is cut left-handed with a helix angle of 15°. Mating gear 5 has 54 teeth. Find the magnitude and direction of the force exerted by all of the bearings on shaft a, b and the c, if bearings B, C and E can take only a radial load while bearings A, D and F are mounted to take both radial and thrust loads. The life goal is 25 kh, with a reliability factor for the ensemble of all four bearings to equal or exceed 96%. The Weibull parameters are x0= 0.02, (θ- x0)=4.439, and b= 1.483. The efficiency of the system is 90%. (a) Select the roller bearing for location B and C and ball bearing for E. (b) Select the ball bearing (angular contact) for location A and D assuming the inner ring rotates and for F assuming the outer ring rotates. ***Can you help me to solve this problem?***
They are usually not. This is more of a hypothetical assumption to understand/explain a concept. It CAN be done, but usually only one of the bearings takes the entire axial load.
@@LessBoringLectures so sir, how can I measure axial thrust on the bearings if I make this helical gear model and keeping in mind that, axial thrust is not equally distributed among bearings?
Then all the axial thrust value is equal to the axial force on the bearing the IS in fact counteracting the thrust. No calculations are needed in that case.
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sooo helpful. Senior ME student and you're helping me understand my Machine Design 2 class SO MUCH BETTER.
Fantastic!
Same
I actually understand what's going on physically/conceptually so much more by watching this videos, thank you a million times over!
This video helped so much on my Mechanical Design 2 term project. Appreciate the clear explanation!
Can't stop watching! They're great revisions and I always find something new or extra.
Thanks! Please share!
@@LessBoringLectures - Always do!
same here!
This is fantastic! Very thorough.
Much appreciated!
the diagrams are extremely helpful - thank you so much
Great Video on Helical Gear!
Amazing OUTSTANDING lecture ❤️❤️❤️💯💯💯💯
this was really good - thanks
Thank you so much... You have cleared the confusion I had.
These are gems! Loving it😍😍
An axial force on the gear would cause a bending moment on the shaft since the force does not act on the axis of the shaft
Hi...Very nice video...can you share some info on torque transmitted to another shaft in case of helical gears
Excelent video. Do you have a lecture about forces on helix bebel gears? A mixture of both explanations youve made on this video
Top information. Thank you.
The figure shows a double-reduction helical gearset. Pinion 2 is the driver, and it
receives a torque of 2120 lbf. in from its shaft in the direction shown. Pinion 2 has
a normal diametral pitch of 8 teeth/in, 14 teeth, and a normal pressure angle of 20
and is cut right-handed with a helix angle of 30°. The mating gear 3 on shaft b
has 36 teeth. Gear 4, which is the driver for the second pair of gears in the train,
has a normal diametral pitch of 5 teeth/in, 15 teeth, and a normal pressure angle of
20° and is cut left-handed with a helix angle of 15°. Mating gear 5 has 54 teeth.
Find the magnitude and direction of the force exerted by all of the bearings on
shaft a, b and the c, if bearings B, C and E can take only a radial load while
bearings A, D and F are mounted to take both radial and thrust loads. The life goal
is 25 kh, with a reliability factor for the ensemble of all four bearings to equal or
exceed 96%. The Weibull parameters are x0= 0.02, (θ- x0)=4.439, and b= 1.483.
The efficiency of the system is 90%.
(a) Select the roller bearing for location B and C and ball bearing for E.
(b) Select the ball bearing (angular contact) for location A and D assuming the
inner ring rotates and for F assuming the outer ring rotates.
***Can you help me to solve this problem?***
super goood!
How about a video talink about the virtual pitch radius or equivalent number of teeth N/cos^3(phi) and the osculatoring circle
MashaAllah Bro Nice
Bro
I love your quick videos!
So clear and quick!
Thanks a lot🫶🏽💪🏽
great video! nice work.
Excelente video
Is it possible to upload the pdf so we can print it and study from it
i cant see the solid works model link in the description box
can you please send the gear file link
Do you have any resources to understand crown/face gears?
Sir, I have a doubt. How can axial thrust be distributed among the bearings equally?
They are usually not. This is more of a hypothetical assumption to understand/explain a concept. It CAN be done, but usually only one of the bearings takes the entire axial load.
@@LessBoringLectures so sir, how can I measure axial thrust on the bearings if I make this helical gear model and keeping in mind that, axial thrust is not equally distributed among bearings?
Then all the axial thrust value is equal to the axial force on the bearing the IS in fact counteracting the thrust. No calculations are needed in that case.
D1 and D2, are they the outer diameter of the gears?
How to find the direction of axial force
Where is the solidworks file?
for the ex : why not use 1 thrust bearing that's what they do in Shigley textbook?
thank you :D
thank you for realll!
No problem!!
couldn't find video about interference (smallest number of teeth which will not have interference formula etc.)
bro where is the solidworks model file link ?
Its good but too fast to understand