| 摘要 |
The speed reducing mechanism operating as an endless screw and tangent wheel device is formed by a shaft (1), threaded rollers (2), the assembly being housed in a casing (5) provided with an opening allowing the access to the tangent wheel (4) of which the teeth mesh with the thread (3) provided on the threaded rollers (2). The threaded rollers (2) rotate about the shaft (1) and soon as the latter is rotated. The thread (2) act on the teeth, inclined or not, of the tangent wheel (4), either by their own inclination, or by the offset of the thread (2) passing from one roller to the next. This mechanism allow to obtain an improved precision in the transmission of the rotation, a play free operation since it is possible to prestress the mechanism in the horizontal and vertical axis in a same required space, it is also possible to obtain a very large range of reduction ratios, range which is composed of rational numbers which do not have to be necessarily integers. Such a mechanism may find itself useful in a great number of applications where a worm gear/tangent wheel reducer was heretofore used, particularly applications where a very high precision and a high efficiency are required. |
