Results 1 to 4 of 4

Thread: Usage of one way bearing

  1. #1
    Associate Engineer
    Join Date
    Oct 2016
    Posts
    1

    Usage of one way bearing

    I am developing a motorized cable reel. I am using a geared DC motor to drive central cable drum on which the cable rests. This cable reel is only used to automatically retract the cable back once the cable is pulled out. The cable is pulled out manually by hand from the cable reel.
    I am using a one way bearing coupled to my DC motor shaft to make it easy to pull out the cable manually. The one way bearing housing is in turn connected to a small sprocket. The small sprocket is connected to the bigger sprocket (attached to the cable drum) via a chain.
    Now, the problem that I am facing is that the whenever I power on the motor, the entire assembly rotates in the direction that the one way bearing moves. But what I need is the assembly needs to rotate in the direction opposite to which the bearing moves. On the side where the bearing rotates freely , I pull the cable out manually (as the bearing makes it easy to pull cable out), and I dont turn on the motor in this case. In the other direction where the bearing doesn't move, I need the entire assembly to rotate in order to pull the cable in, but what happens is that just the motor shaft rotates, the bearing, bearing housing, sprocket, etc dont move.
    What modifications should I make to achieve my goal or any other alternatives for this ? I cannot use an electromagnetic clutch here.
    Also, below is the link to a video where I explain the problem I am facing. problem explanation video
    Also, the one way bearing is connected to the motor shaft via a keyway slot on the bearing and a key on the shaft. I am trying to use the same cycle chain and sprocket concept here and I am trying to understand where I am going wrong here.
    Last edited by Kelly Bramble; 10-22-2016 at 07:30 AM.

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,232
    [quote] Now, the problem that I am facing is that the whenever I power on the motor, the entire assembly rotates in the direction that the one way bearing moves. [/qupte]

    ? Change the voltage polarity on the electrical motor ..
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Senior Engineer
    Join Date
    Jan 2014
    Posts
    58
    Turn the bearing over? I've heard of this referred to as a sprag clutch also.

    Timelord

  4. #4
    Technical Fellow jboggs's Avatar
    Join Date
    Mar 2011
    Location
    Myrtle Beach, SC
    Posts
    779
    Yes. Try it with the bearing flipped.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •