| 摘要 |
A double-effect hydraulic actuating cylinder, particularly for hydraulic steering devices and for marine outboard motors, includes a cylinder slidably fitted on a coaxial rod, or vice versa, which sealingly projects out a head of the cylinder and carries a separating piston dividing the cylinder into two variable volume chambers, each connected to one of two inlets/outlets of the pump and a sealing head for the mutual sliding of cylinder and rod. The rod is non-slidably connected to a bracket fastening the cylinder to the motor, and an idler arm is secured to the motor and integral with the cylinder. At least one of the sealing heads include a sealing element engaging the inner side walls of one of the two variable-volume chambers, and a separate, coaxial plug element placed at the end parts of the cylinder and preventing the sealing element from sliding. |
| 主权项 |
1. A double-effect hydraulic actuating cylinder (1), particularly for a hydraulic steering device and for a marine outboard motor, the outboard motor (5) comprising an end configured for fastening to a transom of a watercraft on which the motor (5) is mounted such to rotate about a substantially vertical steering axis, the steering device comprising a closed hydraulic circuit with a pump driven by a steering device, the double-effect hydraulic actuating cylinder (1) comprising:
a cylinder (1) slidably fitted on a rod (2) coaxial with said cylinder (1), or vice versa, said rod (2) sealingly projecting out of at least one head of the cylinder (1) and carrying a separating piston (21) that divides the cylinder into two variable volume chambers (11, 12), each of the two variable volume chambers (11, 12) having a fluid inlet and a fluid outlet connected to an inlet or an outlet of the pump and a sealing head (3) providing for a mutual sliding of the cylinder (1) and the rod (2), said sealing head (3) being integral with the cylinder, wherein said rod (2) is connected to a bracket (4) non-slidably fastening said cylinder (1) to said motor, thereby allowing a relative rotation of the motor (5) relative to the transom about an axis parallel to an axis of the rod (2); and an idler arm (7) secured to said motor (5) and integral with said cylinder (1), said idler arm being configured to steer said motor (5), wherein said sealing head (3) comprises two separate elements, which include a sealing element (31) and a plug element (32), wherein said sealing element (31) are sealingly fitted into one of said two variable volume chambers (11, 12) and engage inner walls of said chamber (11, 12), wherein said plug element (32) is placed at end parts of said cylinder (1), thereby preventing said sealing element (31) from sliding, and wherein said sealing element (31) and said plug element (32) are coaxial with said rod (2). |
