Radial piston hydraulic motor and method in the control of a radial piston hydraulic motor
AssigneeSampo-Hydraulics Oy
InventorMika Kalervo Lampinen
Life of this patent
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Abstract
The invention relates to a radial piston hydraulic motor (100) and to a method in the control of a radial piston hydraulic motor. The radial piston hydraulic motor (100) includes a free rotation valve (50) which is built inside it and includes a spindle (19). The spindle (19) is disposed in a spindle cavity (20) and it is movable in the spindle cavity (20) such that, in a free rotation situation, shoulders of the spindle (19) block the inlet and outlet passages of working pressure. In a free rotation situation, springs (U1, U2 . . . ) press pistons (13a1, 13a2 . . . ) and press rollers (14a1, 14a2 . . . ) associated therewith to a bottom position and out of contact with a cam ring (11).
Claims10
A radial piston hydraulic motor which includes a box frame (10) with a cam ring (11) connected thereto and pistons (13a1, 13a2 . . . ) in a piston frame (12) and press rollers (14a1, 14a2 . . . ) in the pistons, which press rollers can be pressed by means of the pressure of a hydraulic fluid, such as hydraulic oil, against an inner surface (11′) of the cam ring (11), and that the piston frame (12) is connected to a central shaft (17), and that there is a distributor valve (18) that includes bores (23) through which hydraulic oil can be passed into and out of connection with the pistons (13a1, 13a2 . . . ), the device arrangement including a working pressure inlet passage (B) for the hydraulic fluid and a return passage (A) for the hydraulic fluid which is not under working pressure, wherein the radial piston hydraulic motor (100) includes a free rotation valve (50) which is built inside it and includes a spindle (19) which is disposed in a spindle cavity (20) and which is movable in the spindle cavity (20) such that, in a free rotation situation, shoulders of the spindle (19) block the working pressure inlet and outlet passages (A, B), so that, in a free rotation situation, springs (U1, U2 . . . ) press the pistons (13a1, 13a2 . . . ) and the press rollers (14a1, 14a2 . . . ) associated therewith to a bottom position and out of contact with the cam ring (11).
A method in the control of a radial piston hydraulic motor (100), which radial piston hydraulic motor (100) includes a box frame (10) with a cam ring (11) connected thereto, and that there is a piston frame (12) and pistons (13a1, 13a2 . . . ) moving radially in it and the pistons have press rollers (14a1, 14a2 . . . ), which can be pressed by means of the pressure of a hydraulic fluid, such as hydraulic oil, against an inner surface (11′) of the cam ring (11), and that the piston frame is connected to a central shaft (17), and that there is a distributor valve (18) that includes bores (23) through which the hydraulic fluid, such as hydraulic oil, can be passed into and out of connection with the pistons (13a1, 13a2 . . . ), the device arrangement including a working pressure inlet passage (B) for the hydraulic fluid and a return passage (A) for the hydraulic fluid which is not under working pressure, wherein a free rotation valve (50) built inside the radial piston hydraulic motor (100) is used in the method, which free rotation valve includes a spindle (19) which is moved in a spindle cavity (20), and that in the method, in a free rotation situation, shoulders (t1 and t2) of the spindle (19) block the working pressure inlet and outlet passages (A and B), so that, in a free rotation situation, the pistons (13a1, 13a2 . . . ) and the press rollers (14a1, 14a2 . . . ) associated therewith are pressed by means of springs (U1, U2 . . . ) to a bottom position and out of contact with the cam ring (11), so that the radial piston hydraulic motor (100) can be rotated freely.
Dependencies are inferred from the claim text.