Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
249 words
A radial piston type hydraulic engine, comprising a flat slide valve attached to the engine housing, said slide valve being provided with bores arranged to connect the pressure medium inlet passages and outlet passages of the engine in the engine housing with the cylinder chambers of said engine, said chambers being located in a cylinder block which abuts the slide valve and rotatable in relation thereto, and in which there are arranged in the engine housing displaceable bushings which abut the slide valve and having a surface remote from the slide valve and exposed to the pressure prevailing in respective inlEt and outlet passages to urge the slide valve towards the cylinder block with a force dependent on the pressure in said passages, characterized in that between respective inlet and outlet bores in the slide valve are arranged passages, for supplying pressure medium from the space between the slide valve and the cylinder block to pressure chambers located in the engine housing and that the pressure in these pressure chambers is arranged to act on displaceable balancing means having a second surface exposed to the pressure in the pressure chambers so that said balancing means under the influence of the pressure in the chambers urge the slide valve against the cylinder block with a force which varies in dependence on the pressure variations in the space between the slide valve and the cylinder block in the region of the discharge orifices of the passages while the engine is running.
Claim 2
Dependent Claim
249 words
A radial piston type hydraulic engine, comprising a flat slide valve attached to the engine housing, said slide valve being provided with bores arranged to connect the pressure medium inlet passages and outlet passages of the engine in the engine housing with the cylinder chambers of said engine, said chambers being located in a cylinder block which abuts the slide valve and rotatable in relation thereto, and in which there are arranged in the engine housing displaceable bushings which abut the slide valve and having a surface remote from the slide valve and exposed to the pressure prevailing in respective inlEt and outlet passages to urge the slide valve towards the cylinder block with a force dependent on the pressure in said passages, characterized in that between respective inlet and outlet bores in the slide valve are arranged passages, for supplying pressure medium from the space between the slide valve and the cylinder block to pressure chambers located in the engine housing and that the pressure in these pressure chambers is arranged to act on displaceable balancing means having a second surface exposed to the pressure in the pressure chambers so that said balancing means under the influence of the pressure in the chambers urge the slide valve against the cylinder block with a force which varies in dependence on the pressure variations in the space between the slide valve and the cylinder block in the region of the discharge orifices of the passages while the engine is running.
Claim 3
Dependent Claim
34 words
Engine according to claim 1, characterized in that the passages in the slide valve open out in between respective inlet and outlet bores on the side of the slide valve facing the cylinder block.
Claim 4
Dependent Claim
16 words
Engine according to claim 1 characterized in that the balancing means are formed by the bushings.
Claim 5
Dependent Claim
75 words
Engine according to claim 3, characterized in that the bushings are arranged concentrically with respective inlet and outlet passages, the first surface of the bushings being formed by a radial inner surface, and the second end surface being formed by a surface which is located radially externally of and axially spaced from said first surface and which forms a wall in respective pressure chamber remote from said slide valve and movable in a direction theretowards.
Claim 6
Dependent Claim
43 words
Engine according to claim 4, characterized in that a portion of the inner cylindrical surface of the bushings located between the first and the second surfaces abut a sleeve separating the pressure chambers from respective inlet and outlet passages in the engine housing.
Claim 7
Dependent Claim
42 words
Engine according to any of claim 3, characterized in that the end surface of the bushings bearing against the slide valve is provided with an annular groove from which extends at least one bore, said bore opening out into the pressure chamber.