| 摘要 |
The invention relates to the precision machine manufacturing and can be used as a gear for creating an extra-precise linear drive in the machine-tool industry, metrology, optics and electronic industry.A contactless magnetic screw gear (CMSG) comprises a screw (1) and a nut (2) including a permanent magnet (3) mounted between magnetic circuits (14) having pole pieces (4). A fine-modular thread is made on the screw (1) and the pole pieces (4), grooves of which thread are filled with a solid non-magnetic material flush with tops of the thread ridges. The screw (1) and the nut (2) interact each other via a radial gap (11). According to the second variant of the CMSG, the nut is provided with a housing in which are mounted N double length magnetic circuits and N double length pole pieces separated from each other with the permanent magnets. According to the third variant of the CMSG, the nut is provided with the housing to which a ring insert is rigidly connected, a multiple-start thread in made in that ring insert, and grooves of this thread are filled with a hard magnetic material forming the permanent magnets. According to the fourth variant of the CMSG, the aerostatical throttle element (12) is formed by a ring slot connected to the supplying channels through the radial gap (11) between the screw (1) and the nut (2).
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