mechanism for gear alignment
mechanism for gear alignment
(OP)
Hopefully someone can help me here. I need to have 2 gears in a disengaged position. During operation normal use - one rotates and the other is stationary. When required I would like to engage the teeth of the gears engaging a damper to control the rotation of the first gear. Since the first gear can stop in any rotational position and because of this there is a chance that at this position the teeth will not line up for engagement. Anyone have a suggestion to guide the second gear to the first engaging the teeth. (can't use friction, as in, have the gears engaged and use a clutch to engage the damper)
If I have posted in the wrong forum let me know please.
Thanks
Stephen
If I have posted in the wrong forum let me know please.
Thanks
Stephen





RE: mechanism for gear alignment
RE: mechanism for gear alignment
The intermediate hub should mount on a low angle helical spline, and the gear should mount to the intermediate hub on a straight spline.
The gear should float, but be spring loaded to the engaged position. The selector should act on the intermediate hub.
Just my initial impulse answer. I have not thought it through in detail. Have I shot from the hip and missed something.
Regards
eng-tips, by professional engineers for professional engineers
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RE: mechanism for gear alignment
Just one option to look at..
Cheers
I don't know anything but the people that do.
RE: mechanism for gear alignment
It'd probably help if you gave us a hint about sizes, speeds, power etc, and whether cost is an important consideration.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: mechanism for gear alignment
RE: mechanism for gear alignment
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: mechanism for gear alignment
RE: mechanism for gear alignment
I have modeled a number of concepts that my Sr Eng's have shot down (but not offered guidance)including..
1) engaged gears with dog face slide engage through the use of a lever. (to complex they said)
2) clutch faces (friction not allowed)
3) slide axially the 2 spur gears together with champers on the edges of the teeth.
Cost - unlimited to a point (this is space)
gear ratio - 1:1
torque - 600 in/lbs
speed - 1 degree/sec
total rotation is only +/- 135 degrees
one way or another I will make this work, I as trying to think of a way of having a follower on the stationary gear that would mechanically follow the rotating gear and keep track of the moving teeth. Since the damper doesn't offer resistance at low speeds (fractions of a degree/sec) i could have the damper follow the indicator slowly rotating as it engages. The environment is very cold with large temp swings. Lube and thermal tolerance's are a huge issue.
I could be up the creek as they say - I prefer number 1 or 3
so this may be my backup, but simplicity is king.
Thanks for listening.
Stephen
RE: mechanism for gear alignment
A dog clutch can also be very simple.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: mechanism for gear alignment
Dog clutch:
- one half with regular dogs.
- second half with a large number of small spring loaded sliding pin dogs; think of one of those one size fits all socket wrenches. On engagement, some of the pin/dogs will be blocked and the springs compressed. Some will not be blocked, and their edges will engage the mating dogs.
Mike Halloran
Pembroke Pines, FL, USA
RE: mechanism for gear alignment
Best wishes.
S