| 摘要 |
A machine for fitting and removing a tire (1) from a rim (2) of a wheel (3). The machine comprises a frame (10), a rotating table (11) for attaching the wheel to and for rotating the rim about its axis (Y), and a tool for fitting and/or removing the tire from the rim. The machine also comprises a lever (12) to which a pressure element (13) is attached in order to push the bead (6) of the tire toward a circumferential recess of the rim. The lever (12) is connected to the frame (10) and comprises a first articulation in order to bring a pressure element (13) closer to or further from the axis (Y), and a second articulation in order to bring the pressure element (13) closer to or further from a central plane (PC) perpendicular to the axis (Y) and passing through the center (D) of the rim (2). The first articulation is situated at a location such that the friction force of the tire on the pressure element (13) when the tire is in rotation will result in a centripetal force on the pressure element (13), thus reducing the force to be exerted on the lever (12). The second articulation is situated at a location such that said friction force will result in a force on the pressure element (13) directed toward the central plane (PC), thus also reducing the force to be exerted on the lever (12).
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