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A quick return mechanism is an apparatus to produce a reciprocating motion in which the time taken for travel in return stroke is less than in the forward stroke. It is driven by a circular motion source (typically a motor of some sort) and uses a system of links with three turning pairs and a sliding pair.
Offset: If the line of travel of the hinged joint of the slider does not pass through the base pivot of the crank, the slider movement is not symmetric. It moves faster in one direction than the other. This is called a quick-return mechanism. There are also two methods to design each type: graphical and analytical.
Small Payload Quick Return (SPQR) is a NASA Ames Research Center concept to return small payloads from orbit. [1] The system uses an Exo-Brake, a parachute-like drag device for use in the low-pressure exosphere of Low Earth Orbit. This is the first part of a three part return system, operating from 350 to 100 km. [2]
With four-bar mechanisms there are two strokes, the forward and return, which when added together create a cycle. Each stroke may be identical or have different average speeds. The time ratio numerically defines how fast the forward stroke is compared to the quicker return stroke. The total cycle time (Δt cycle) for a mechanism is: [6]
This inversion is obtained when link 2 (crank) is fixed. Application- Whitworth quick return mechanism, Rotary engine, etc... Third inversion. This inversion is obtained when link 3 (connecting rod) is fixed. Applications - Slotted crank mechanism, Oscillatory engine etc.., Fourth inversion. This inversion is obtained when link 4 (slider) is fixed.
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