strangelove
Mechanical
Hello!
Have any of you out there heard of a delayed engagement clutch bearing?
A regular clutch bearing, of course, will allow a shaft freewheeling rotation in one direction, but not in the inverse. So the instant the direction of rotation of the shaft reverses the clutch bearing locks up and transmits the torque of the shaft through the bearing to whatever sprocket or device that the bearing is mounted into.
The correct designation for this type of bearing is a drawn cup roller clutch. We are currently using a Timken Fafnir bearing number RC-121610 for our application. It fits on a 3/4 inch shaft and has an outside diameter of 1 inch. It is rated for 206 IN-LBF torque.
However, we are facing few design constraints relative to the dimensions or the rated capacity of the bearing. The shaft size is not critical, nor is the outside diameter of the bearing, and the bearing is overrated for the application in terms of strength.
The problem I face is that this bearing engages the shaft on counterrotation very rapidly. I need the bearing to engage on counterrotation, but only after a minimum of ten degrees, preferably fifteen to twenty degrees.
Anyone heard of a lutch bearing that can do this? Or are there any other ideas of how to acheive the same effect simply?
Many thanks!
Strangelove (poepbf)
Have any of you out there heard of a delayed engagement clutch bearing?
A regular clutch bearing, of course, will allow a shaft freewheeling rotation in one direction, but not in the inverse. So the instant the direction of rotation of the shaft reverses the clutch bearing locks up and transmits the torque of the shaft through the bearing to whatever sprocket or device that the bearing is mounted into.
The correct designation for this type of bearing is a drawn cup roller clutch. We are currently using a Timken Fafnir bearing number RC-121610 for our application. It fits on a 3/4 inch shaft and has an outside diameter of 1 inch. It is rated for 206 IN-LBF torque.
However, we are facing few design constraints relative to the dimensions or the rated capacity of the bearing. The shaft size is not critical, nor is the outside diameter of the bearing, and the bearing is overrated for the application in terms of strength.
The problem I face is that this bearing engages the shaft on counterrotation very rapidly. I need the bearing to engage on counterrotation, but only after a minimum of ten degrees, preferably fifteen to twenty degrees.
Anyone heard of a lutch bearing that can do this? Or are there any other ideas of how to acheive the same effect simply?
Many thanks!
Strangelove (poepbf)