One Way Bearing

[revo_rob_1984]

I know this gonna sound stupid but i have a question about the owb/roller clutch. How exactly does this part work i have been tryin to figure out how it works and i am stumped. how does it grip the shaft to turn the motor and after it grips it how does it let it spin freely. I know it says i am an experienced RC Driver but i am not an experienced RC worker oner LOL. . .so any information would be helpful. Thanks

 

[LBSinGTX]

The OWB is what your starting force is transferred to. Pull start, roto backplates etc, fit over the OWB, and when activated, the backplate housing spins The OWB, which grips the starter shaft and lets it only turn in a clockwise direction. Since the starter shaft is spun from the other side of the crankshaft, it allows your crankshaft to spin in the desired counter-clockwise direction only.
There are like 12 teeth inside the bearing that hold it to the start shaft. I haven't openened up a OWB yet, so I don't know really how they work mechanically on the shaft.
Hope that helps.

 

[revo_rob_1984]

The OWB is what your starting force is transferred to. Pull start, roto backplates etc, fit over the OWB, and when activated, the backplate housing spins The OWB, which grips the starter shaft and lets it only turn in a clockwise direction. Since the starter shaft is spun from the other side of the crankshaft, it allows your crankshaft to spin in the desired counter-clockwise direction only.
There are like 12 teeth inside the bearing that hold it to the start shaft. I haven't openened up a OWB yet, so I don't know really how they work mechanically on the shaft.
Hope that helps.

actually that helps quite a bit and it explains what those black things were inside the bearing hole that connects to the shaft. . .thanks a bunch you cleared that up for me

 

[ThunderTiger]

I know this gonna sound stupid but i have a question about the owb/roller clutch. How exactly does this part work i have been tryin to figure out how it works and i am stumped. how does it grip the shaft to turn the motor and after it grips it how does it let it spin freely. I know it says i am an experienced RC Driver but i am not an experienced RC worker oner LOL. . .so any information would be helpful. Thanks

A OWB is, pretty much a needle roller bearing, with, depending on the application, a varying number of "needle rollers". How it works, is that it is designed so that the "Rollers" engage when rotated in a "Specific" direction.

As the OWB is rotated in the "correct" direction, the directional rotation causes the needles to "Engage" by moving slightly outwards from the housing thus gripping and locking onto the starter shaft. When gripping the shaft and with the continued rotational forces the ensemble will spin the starter shaft, which, through the very design of the starter shaft, rotates the crankshaft, lifting the piston up and down within the cylinder, thus creating the "Compression" ignition of the fuel mixture and, in conjunction with the glow plug, will cause the engine to "Fire" (or start).

Once the engine is running, with no directional forces acting on the "Needle rollers" from the "Starting cycle" (pulling on the starter, using the roto start etc etc) they will loosen their grip on the shaft allowing the shaft to spin freely within the rollers themselves.

Taking it further, the continued "compression ignition" of the 2 stroke cycle will keep the glow plug "lit" when the glow plug ignitor is removed and thus the engine will continue running once started and the glow plug ignitor is removed.

 

[revo_rob_1984]

thank you very much i appreciate the info i now know how the owb bearing works

 

[olds97_lss]

This shows you with a diagram:
http://www.rctek.com/technical/bearings/bearings_one_way.html

 

[revo_rob_1984]

This shows you with a diagram:
http://www.rctek.com/technical/bearings/bearings_one_way.html

that really clears up my questions about OWB. . .i really appreciate that alot