A WINDMILL HAVING AUTOMATIC PITCH CONTROL MEANS

摘要

For adjusting the pitch of the wings of a windmill according to the wind and thus for stabilizing the wing rotation both in gusty wind and by general changes of the wind pressure the wings are mounted on wing spindles (10) rotatably held in wing bushings (1) on the wing hub (4), these bushings (12) being mounted pivotally about an axis (16) tangential to the path of rotation of the hub (4), such that the single wing (8) can yield rearwardly by sudden gusts, whereby the end of the wing spindle (10) will be moved slightly forwardly. On the end of the spindle (10) is eccentrically provided a pin (18), which is fixed relative the hub (4), such that said forward movement of the spindle end results in a rotation of the spindle (10) and therewith in a relevant adjustment of th wing pitch by gusts of wind. By a generally increasing wind a steadily reduce pitch will be desirable for stabilizing the speed of the wing rotor, and this is obtained by adjusting the position of the eccentric pin (18) by means of a mechanical servo mechanism comprising a roller (42) which is affected by the centrifugal force so as to react to an increased rotor speed by being forced against an annular track wall portion (46) on the mill housing (2), whereby the rotation of the roller (42) itself is utilized to produce the required displacement of the eccentric pin (18) for a relevant adjustment of the wing pitch