Scott-Russell linkage
A Scott-Russell linkage is a planar straight-line mechanism similar to a Watt linkage .
It consists of two links: one is pivotable at a fixed point and in the middle of the second, twice as long. This is guided linearly movable at one end, the other end can then only move along a straight line. The directions of movement are perpendicular to each other.
The Scott-Russell linkage is used, among other things, in cars as a transverse guide for rigid rear axles. One link can be rotated on the chassis and articulated on the axle so that it can move sideways, while the short link connects the axle and the middle of the long link. The construction works like a Panhard rod without lateral offset and is more compact and lighter than a Watt linkage with its two fixed points on the chassis that are far apart.
Drawing from British Patent 2741, November 17, 1803
Drawing colored for illustration
animation
Web links
- Scott-Russell mechanism in motion (Java applet)