| 摘要 |
<p>The invention concerns a constant velocity joint for gimballed helicopter rotors in which the rotor hub (2) is connected to a drive shaft (mast) (1) by means of two opposing elastomeric laminated spherical bearings (4), which allow the said rotor hub to tilt on two axes, and whose upper and lower supports are located at the opposite ends of a horizontal cavity of the hub, inside which a series of improved elastomeric dragging devices have been installed (5) that are identical to each other and which are composed of spherical bearings to which are secured - externally and internally - two elastomeric cylindrical radially laminated bearings which slide elastically on their axis, such bearings being of different sizes but, at the same time, being also characterized by the fact that they have the same longitudinal rigidity. The external bearings of these devices are lodged in appropriate annular apertures which are arranged on a flange (3) secured to the mast, whereas the bearings that are inside the couplings are secured, by means of feathering bolts (6), to the hollow rotor hub (2). The rotor hub tilts relative to the mast also on account of the spherical couplings of the aforementioned dragging devices, whose centers - thanks to the identical rigidity of both elastomeric cylindrical bearings connected thereto - are arranged on a plane which bisects the angle between the mast flange and the rotor hub, thus creating a constant- velocity joint. This type of constant-velocity joint is used in a two- blade helicopter rotor and is also used in three-blade and multi-blade helicopter rotors in general. It is, moreover, used - in the event that constant-velocity joints are required - in generic appliances for the transmission of motion between two masts tilting towards each other.</p> |
