In trying to lower a positive load I'm wondering if the motor would start chattering down. The pressure would rise, the brake would release, the load would over run oil supply, pressure drop, brake re-apply, etc...
Worry #2 - if the brake is piloted from the common case cavity, could a lack of back pressure on the low pressure return side drain away the pilot for the brake. The catalog seems only concerned with too much back pressure keeping the brake in a state of release. There is a port to hydraulicly release the brake so this port is common with the case drain cavity, but the literature suggests brake functioning is integral.
I would much rather have a counterbalnce with shuttle to pilot the brake off, but I think with this motor, in neutral, the back pressure from the counter balance (trapped pressure)leaking to the case drain cavity would keep the brake in a state of release. In other words the load would pilot the brake off.
http://hydraulics.eaton.com/products/pd ... pool_B.pdf
This would be my interpretation of how it functions. Orifices are not actually orifices, just there to indicate internal leakage paths.
- T_Brake.gif (7.87 KiB) Viewed 5109 times
This would be the way I would prefer to do it, but I realize there is no way to isolate the case from the brake port on the T series as I've drawn it.
I think it would still work with the shuttle feeding the brake port (which is also connected to the case drain cavity, not drawn that way though)and in neutral with A&B to T the brake port should still be able to drain back through the shutle. It might even be better that way, as the CB valve should start holding the load before the friction disks grab. Anybody done this with the brake equiped T series?
- t_BrakeCB.gif (7.73 KiB) Viewed 5109 times
