Which is NOT a typical mechanical linkage that can be combined with hydraulic cylinders?
Answers
Answer:
Limaçon drives
A number of mechanical linkages are available to impart limaçon motion to the lenticular two-lobe rotor of the limaçon positive displacement machine. The features of the limaçon motion can be summarized as follows;
(i)
the centre point on the chord remains attached to the circumference of a base circle and rotates about the centre of that circle at twice the rotational speed of the chord itself.
(ii)
the chord is permanently attached to point o on the circumference of the same circle where it is allowed to slide and rotate.
(iii)
the instantaneous centre of the rotor falls on the base circle diametrically opposite the rotor centre point.
Besides the linkage shown in Fig. 1, a number of other mechanical drives have been proposed to operate limaçon machines as can be found in patents dated as far back as the 1890s. For example, a cam-assisted drive, similar to that shown in Fig. 5, was proposed by Wheildon (1896) and then by Georgiev (1981). Another cam-assisted linkage has been featured by Trapalis (2005), except in this new design the rotor is equipped with a circular sliding surface to facilitate gliding over the stationary cam contour