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| Gearbox acting on fixture | |||
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| Posted by: dsmerrick ® 01/22/2010, 09:59:47 Author Profile eMail author Edit |
Hi, I'm trying to figure out the loads of a gear box acting on a mounting fixture and I'm getting kind of confused. I have a few different senarios that I'm dealing with: 1). Using an Inline, 2 stage gearbox 2:1, direction of rotation "in" is the same as "out" (say CW). Motor inputing 2 ft*lb CW and gearbox output is 4 ft*lb CW. The resisting torque of the component that the gearbox is acting on is obviously 4 ft*lb CCW. Do the mounting bolts of the gearbox have to resist 2 ft*lb CW (4 ft*lb - 2 = 2 ft*lb CW)? 2). Using an Inline, 1 stage gearbox 2:1, direction of rotation "in" is the opposite of "out" (say CW in CCW out). Motor inputing 2 ft*lb CW and gearbox output is 4 ft*lb CCW. The resisting torque of the component that the gearbox is acting on is 4 ft*lb CW. Do the mounting bolts of the gearbox have to resist 6 ft*lb CW (4 ft*lb + 2 = 6 ft*lb CW)? 3). Using a 90 degree, 1 stage gearbox 2:1. Motor inputing 2 ft*lb (yz plane) and the resisting torque of the component that the gearbox is acting on is 4 ft*lb (xy plane) . Do the mounting bolts of the gearbox have to resist the xyz component opposite to the resistive forces?
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| : Gearbox acting on fixture -- dsmerrick | Post Reply | Top of thread | Engineering Forum |
| Posted by: zekeman ® 01/23/2010, 10:08:32 Author Profile eMail author Edit |
1- 2 ft-lb
2 6 ft- lb 3- resist torque in both planes |
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| : Gearbox acting on fixture -- dsmerrick | Post Reply | Top of thread | Engineering Forum |
| Posted by: jboggs ® 01/22/2010, 15:26:11 Author Profile eMail author Edit |
Is the motor mounted on the gearbox or separately? |
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| : : Gearbox acting on fixture -- jboggs | Post Reply | Top of thread | Engineering Forum |
| Posted by: dsmerrick ® 02/01/2010, 17:15:59 Author Profile eMail author Edit |
the gearbox is not mounted to the motor but it's mounted on the same fixture. |
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| : : : Gearbox acting on fixture -- dsmerrick | Post Reply | Top of thread | Engineering Forum |
| Posted by: jboggs ® 02/02/2010, 08:14:05 Author Profile eMail author Edit |
1. I've been doing this for 35 years. I have mounted hundreds of gearboxes in every imaginable orientation. I have always just used the bolt size recommended by the manufacturer. You will damage the internal bearings before you will overload those bolts. All reputable manufacturers will specify a maximum overhung load. Just don't exceed that. 2. There are exceptions, but usually the torque produced by a gearbox isn't as much an issue as is the resultant tension in the driven member (chain, belt, etc.). Base your calculations (if you must do that) on the forces in the chain or belt. |
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