04-05-2015, 10:31 AM
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ppt single slider crank mechanism
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08-03-2017, 12:55 PM
The reversal of the crankshaft chain arises when the connecting rod, or coupling, of a crank catch becomes the ground link, so the slider connects directly to the crank. This inverted sliding lever is the form of a crank-sliding link which is often used to drive a hinged link in construction equipment such as a crane or backhoe, as well as to open and close a swinging door or door. Crank mechanism, Arrangement of mechanical parts designed to convert the movement in a straight line into a rotary motion, as in an alternative piston engine, or to convert the rotary motion into a straight line, as in an alternative piston pump. The basic nature of the mechanism and the relative movement of the parts can best be described with the aid of the accompanying figure, in which the moving parts are slightly shaded. The darkly shaded portion 1, the fixed frame or block of the pump or motor, contains a cylinder, shown in cross-section through its walls DE and FG, in which the piston, part 4, slides forward and backward.
The small circle in A represents the main crankshaft bearing, which is also in part 1. The crankshaft part 2 is shown as a straight member extending from the main bearing in A to the bearing of the connecting rod in B, Which connects it to the connection The connecting rod is shown as a straight member extending from the crank bearing in B to the wrist bearing in C, which connects it to the piston, part 4, which is shown as a rectangle. The three bearings shown as circles in A, B and C allow the connected members to rotate freely with respect to each other. The path of B is a circle of radius AB; When B is at point h, the piston will be in position H, and when B is at point j, the piston will be in position J. In a gasoline engine, the cylinder head (where the explosion of the mixture Gasoline-air takes place) is in EG; The pressure produced by the explosion will push the piston from position H to position J; The return movement from J to H will require the rotational energy of a flywheel attached to the crankshaft and rotating about a colinear bearing with bearing A. In an alternative piston pump the crankshaft would be driven by a motor.
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