| 摘要 |
The present invention relates to a rotary motor, preferably a pivot drive for construction machinery, hoisting gear, trucks and the like, comprising an elongate, approximately tubular housing, at least one piston which is axially displaceably received in the housing and which can be axially driven by the charging of a pressure medium in a pressure chamber as well as at least one shaft which is received axially fixedly in the housing and rotatably around an axis of rotation, with the piston having a shaft passage cut-out by which the piston is axially displaceably seated on the shaft. In accordance with the invention, the shaft forms a crankshaft whose axis of rotation is offset with respect to the shaft passage cut-out. The shaft piece respectively passing through the shaft passage cut-out has a lever arm which is opposite the axis of rotation of the shaft and which translates the radial force at the engagement between the shaft and the piston which arises due to the axial displacement of the piston and the pitch of the spiral engagement track between the shaft and piston and/or between the piston and the housing into a rotary movement of the shaft with respect to the housing or vice versa. To achieve favorable force output conditions, provision is in particular made in this respect for the shaft passage cut-out to be arranged approximately centrally in the piston with respect to the cross-sectional surface of the piston, with a security against rotation of the piston being omitted so that a rotatability of the piston with respect to the housing is given. |
