Hydraulic cylinder and method for the manufacture thereof

A hydraulic cylinder comprising:

• a cylinder body which has an open end with an opening and an edge extending therearound, which cylinder body also has an inner surface;
• a piston rod which is movable back and forth in a cylinder space;
• a close-off member which has an insert part, which insert part protrudes in a fitting manner into the open end of the cylinder body, which insert part has an outer circumferential face, wherein the close-off member also has a flange opposing the edge of the cylinder body;
• coupling means which are operable between the inner surface of the cylinder body and the outer circumferential face of the insert part for securing, in at least one axial direction, the close-off member in the cylinder body, and
• a clamping ring which is clamped between the flange and the edge at the open end of the cylinder body,
• wherein the clamping ring is made of a resilient, compressible material, and in that the clamping ring is clamped, when compressed in the axial direction, between the flange and the edge at the open end
• wherein the flange comprises a receiving groove which is recessed in the axial direction and wherein the clamping ring is received, and wherein the receiving groove has a groove width allowing, at least partial, reception of a cylinder wall of the cylinder body in the receiving groove.

A method for manufacturing a hydraulic cylinder having a cylinder body and close-off member to be coupled thereto, which method includes:

• providing a cylinder body having an open end, wherein the cylinder body comprises in an inner surface thereof a first peripheral groove distanced from the open end;
• providing a close-off member with an insert part which is suitable for being received in the open end of the cylinder body, the insert part having an outer circumferential face, the close-off member also having a flange which comes to oppose the edge at the open end of the cylinder body, and a second peripheral groove being provided in the aforementioned outer circumferential face;
• attaching a coupling ring in the second groove;
• attaching a clamping ring made of a resilient, compressible material around the outer circumferential face of the close-off member against the flange;
• feeding, with the insert part in the open end of the cylinder body, the close-off member and further displacing therein, with compression of the clamping ring between the flange and the edge of the open end of the cylinder body, until the coupling ring couples with the first peripheral groove;
• and
• subsequently releasing the close-off member so that the close-off member is secured in the cylinder body.