| 摘要 |
1,177,221. Rotary hydraulic motors and pumps. K.A. OVRETVEIT. Jan.11, 1967 [Jan.15, 1966], No.1989/66. Heading F1F. A rotary hydraulic motor (or pump), particularly a winch motor, comprises a housing Figs.1, 2, made in two parts 1a, 1b joined along a medial transverse plane B and formed with cylindrical compartments rotatably mounting a main torque rotor 2 having radially projecting blades 3 and at least one sealing rotor 6 having peripheral slots 14 co-operable but out of sealing contact with the blades mounted on parallel shafts and interconnected by gearing for simultaneous rotation in opposite directions wherein the main torque rotor and sealing rotors are located in radial roller (or ball) bearings and axial thrust ball (or roller) bearings so that the rotors rotate accurately with minute clearance between the rotors under all operating conditions. As shown, there are four sealing rotors 6a, 6b, 6c, 6d with cut-away slots 53 between the slots 14 communicating with pairs of inlet ports 17a, 17b, 17c, 17d and outlet ports 18a, 18b, 18c, 18d with one pair for each rotor providing four independent circuits controlled by means of a control valve 42 connected to a pump 24 so that the loading capacity and speed of the winch may be controlled over a range of values. Grooves 46 are provided diametrically opposite the inlet and outlet ports and holes interconnect diametrically opposite slots 14 to ensure hydraulic balancing of the respective rotors. The main torque rotor 2 as shown, is located in radial roller bearings 4 and axial thrust ball bearings 5 and the sealing rotors in roller bearings 7 and axial thrust ball bearings 8. The main torque rotor passes sealingly between faces 20 on the housing parts 3a, 3b and the blades 3 are formed on either side with axially extending projections 3a, 3b. In a modified construction, Fig. 4 (not shown), the running accuracy of the roller bearings 4, 7 and thrust bearings 5, 8 are adjustable. The roller bearings having the bores of the inner races tapered and mounted on complementary tapered positions of the respective shafts and nuts to axially adjust the bearings. The thrust bearings are supported on rings which are adjustable axially by means of nuts. |
