Need help understanding a two-speed hydraulic motor circuit
Need help understanding a two-speed hydraulic motor circuit
(OP)
I am currently working with a drilling/piling rig. I saw in multiple youtube clips that their rig can be controlled in the way that the auger, which is drove by a hydraulic motor, can be operated at a high rpm (low torque for getting rid of dirt above ground) and a low rpm (high torque for drilling). How do they achieve this while having a single fixed-displacement pump? How does a two-speed hydraulic motor works? Anything that would help me understanding this is appreciated. :)
Thank you.
Thank you.





RE: Need help understanding a two-speed hydraulic motor circuit
e.g. Say the pump is pumping 100L/min and the motor is 100cc, this = 1000RPM. If the motors displacement is changed to 200cc, the RPM will halve to 500RPM but the torque will double.
Some pumps have on/off type displacement change while others are infiniately variable to achieve a wide range of speeds and torques.
RE: Need help understanding a two-speed hydraulic motor circuit
RE: Need help understanding a two-speed hydraulic motor circuit
The displacement is increased or decreased pressurizing a chamber where a piston is directly connected with the swash plate