Patent ID: 7192264
Filing Date: 2007-03-20
Classification: F01C,F04C

Abstract:
1. A hydraulic motor having a non-rotating annular outer casing, moving eccentric means inside the outer casing, a power shaft connected to the eccentric means and rotatable thereby, a pressure chamber arrangement communicating with the eccentric means for moving the eccentric means and thus rotating the power shaft by hydraulic fluid, steam or pressurized air led into and removed from the pressure chamber arrangement, and a non-rotating annular inner casing inside the non-rotating annular outer casing, wherein the eccentric means comprise an eccentric part formed in the power shaft, a first eccentric ring between the outer casing and the inner casing, and a second eccentric ring mounted with bearings around the eccentric part of the power shaft and connected fixedly and concentrically to the first eccentric ring, whereby the pressure chamber arrangement is located between the first eccentric ring and the inner casing in such a manner that the first eccentric ring drives the power shaft through the second eccentric ring, and the first and second eccentric rings form a substantially non-rotating entity that only performs an eccentric movement and makes the power shaft rotate by this eccentric movement.