Explanation of Counter Balancing
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From: Denver, CO
Explanation of Counter Balancing
Can anyone explain counter-balancing to me as if I'm 5 years old. Mentally it's not that far off.
So I've done some searching and came up with photos and descriptions of why counterbalancing is done, but nothing about how it actually works. I've done extensive google searching for some type of animation on how the counterbalance actually operates and came up with nothing. Hoping someone can explain how the pictures (posted from a forum thread on here about 3 years ago) actually make the motor counter-balanced.
So I've done some searching and came up with photos and descriptions of why counterbalancing is done, but nothing about how it actually works. I've done extensive google searching for some type of animation on how the counterbalance actually operates and came up with nothing. Hoping someone can explain how the pictures (posted from a forum thread on here about 3 years ago) actually make the motor counter-balanced.
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Joined: Nov 2013
Posts: 7,492
Likes: 103
From: Stuttgart, Germany
I'm gonna try it in a very briefly although I'm not the ideal person as a non-native speaker...
The con-rods are on the bottom connected to the con rod journal (crank pivot). The con rod journal is offset to the crankshaft (in the center with little sprocket). The impulse of the combustion makes the crankshaft turn while the con rod journal rotates around it with an offset (circular path).
Due to the overall geometry the motor obviously has rotating masses that are offset of the center axis (crank shaft). These offset rotating masses produce vibrations that can cause noises and even damage to the mechanical parts, e.g. bearings.
The balance shafts have defined weights which are also offset of the balance shaft axis. The balance shafts are driven synchronously by the chain that goes around the balance shaft sprockets and (in your picture) under the crank shaft sprocket. The weights on the balance shafts produce a counter vibration that is designed to exactly eliminate the vibration of the rotating crankshaft with all it's connected masses. Simply, when the offset mass of the crankshaft assembly moves left the offset mass (weight) of the balance shaft moves right. In fact it's a little bit more complicated than that but that's the basic principle though.
Check out this Youtube link >>
The con-rods are on the bottom connected to the con rod journal (crank pivot). The con rod journal is offset to the crankshaft (in the center with little sprocket). The impulse of the combustion makes the crankshaft turn while the con rod journal rotates around it with an offset (circular path).
Due to the overall geometry the motor obviously has rotating masses that are offset of the center axis (crank shaft). These offset rotating masses produce vibrations that can cause noises and even damage to the mechanical parts, e.g. bearings.
The balance shafts have defined weights which are also offset of the balance shaft axis. The balance shafts are driven synchronously by the chain that goes around the balance shaft sprockets and (in your picture) under the crank shaft sprocket. The weights on the balance shafts produce a counter vibration that is designed to exactly eliminate the vibration of the rotating crankshaft with all it's connected masses. Simply, when the offset mass of the crankshaft assembly moves left the offset mass (weight) of the balance shaft moves right. In fact it's a little bit more complicated than that but that's the basic principle though.
Check out this Youtube link >>
Last edited by EagleRay; Jul 15, 2014 at 01:46 PM.
Ultimate HDF Member
Joined: Nov 2013
Posts: 7,492
Likes: 103
From: Stuttgart, Germany
Nope. Doesn't float! It's bolted to the crankshaft housing.
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