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Thread: Hyd. motor and coupler fastening

  1. #1
    Associate Engineer
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    Hyd. motor and coupler fastening

    I'm mounting a large coupler to a hyd. motor that has a splined shaft. I had set screws machined into the coupler normal to the splines it covers to secure it. But now the manager wants to add a 1/4" keeper plate utilizing the two tapped holes on the end of the shaft to force the splines to ride up and wedge where the splines taper out on the shaft.

    See attached pictures

    The assembly is subject to 300 rpm max 165 hp max 10500 ft-lb torque.

    Is this good practice?
    Attached Images Attached Images

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
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    Is there another way to ensure the coupler does not back out or move?
    Last edited by Kelly_Bramble; 03-29-2023 at 04:51 PM.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
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    No, but the coupler already has set screws ,one at 0 and at ~98 both are normal to a spline tooth.

  4. #4
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    What im trying to say is that, is it good for force-wedge it onto the base of the splined shaft?

  5. #5
    Technical Fellow Kelly_Bramble's Avatar
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    Quote Originally Posted by chrishilton979 View Post
    What im trying to say is that, is it good for force-wedge it onto the base of the splined shaft?
    Sure - it seems to work from the limited information I/we have. The challenge with internet advice is that it is not possible to fully understand a challenge with limited information.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  6. #6
    For what its worth, a good deal of my white hair has come from depending on set screws for ANYTHING IMPORTANT. Find another way.

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