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These double-acting engines required the invention of the parallel motion, which allowed the piston rods of the individual cylinders to move in straight lines, keeping the piston true in the cylinder, while the walking beam end moved through an arc, somewhat analogous to a crosshead in later steam engines.
The Pelland Sports formed the basis of the first Pelland steam car called "The Steam Cat" This was the same fibreglass monocoque chassis and used a twin-cylinder double-acting compound engine. The car was built to a contract with the South Australian Government in 1974. It currently is at the National Motor museum at Birdwood South Australia.
Typical horizontal steam engine with double-acting cylinder. A double-acting cylinder is a cylinder in which the working fluid acts alternately on both sides of the piston. . In order to connect the piston in a double-acting cylinder to an external mechanism, such as a crank shaft, a hole must be provided in one end of the cylinder for the piston rod, and this is fitted with a gland or ...
The engine was an ingenious three-crank tandem (or steeple) compound engine with three pairs of vertical single-acting cylinders arranged in such a way as to give a double-acting effect. Its sustained maximum power was 120 bhp (89 kW); peak power was 155 bhp (116 kW) but could not be held due to insufficient steam flow.
A double acting engine is an engine where steam is applied to both sides of the piston. Earlier steam engines applied steam in only one direction, allowing momentum or gravity to return the piston to its starting place, but a double acting engine uses steam to force the piston in both directions, thus increasing rotational speed and power. [50]
A return connecting rod, [1] [2] return piston rod [i] or (in marine parlance) double piston rod engine [2] or back-acting engine is a particular layout for a steam engine. The key attribute of this layout is that the piston rod emerges from the cylinder to the crosshead , but the connecting rod then reverses direction and goes backwards to the ...
In kinematics, the parallel motion linkage is a six-bar mechanical linkage invented by the Scottish engineer James Watt in 1784 for the double-acting Watt steam engine. It allows a rod moving practically straight up and down to transmit motion to a beam moving in an arc, without putting significant sideways strain on the rod.
The engine itself is of an unusual triple-expansion, three-crank rocker design, with pistons 13.7, 24.375, and 39 inches (348.0, 619.1, and 990.6 mm) in diameter and 6-foot (1.8 m) stroke. Each rocker is connected both to a crankshaft with a 15-foot (4.6 m) flywheel and to a double acting pump's plunger.
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