Double Slider Crank Chain Mechanism.pdf [Extra Quality]
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Double Slider Crank Chain Mechanism.pdf [Extra Quality]
Double Slider Crank Chain Mechanism: Working and Applications
A double slider crank chain mechanism is a type of four-bar linkage that consists of two sliding pairs and two turning pairs. It is named so because it has two sliders that move along fixed guides and a link that connects the two sliders and maintains a constant distance between them. A double slider crank chain mechanism can be used to convert rotary motion to reciprocating motion or vice versa.
One of the most common examples of a double slider crank chain mechanism is the Oldham coupling, which is used to transmit rotary motion between two parallel shafts that are slightly misaligned. The Oldham coupling consists of three discs: one disc is attached to each shaft and has a slot along its diameter, and the third disc is placed between the two slotted discs and has two tongues that fit into the slots. The third disc slides along the slots as the shafts rotate, thus transmitting torque from one shaft to the other. The Oldham coupling can also be seen as an inversion of a double slider crank chain mechanism, where the two sliders are fixed and the link rotates.[^1^] [^2^]
Another example of a double slider crank chain mechanism is the slider-crank linkage, which is used to convert rotary motion to linear motion or vice versa. A slider-crank linkage consists of a crankshaft, a connecting rod, and a piston. The crankshaft rotates about a fixed axis and has a pin that connects to the connecting rod. The connecting rod has another pin that connects to the piston, which slides along a cylinder. The rotation of the crankshaft causes the piston to move back and forth along the cylinder, thus converting rotary motion to linear motion. Conversely, the linear motion of the piston can be used to drive the rotation of the crankshaft. A slider-crank linkage can also be seen as an inversion of a double slider crank chain mechanism, where one of the sliders is fixed and acts as a frame for the other slider and the link.[^3^] [^4^]
A double slider crank chain mechanism can have various applications depending on its configuration and inversion. Some of these applications are:
Oldham coupling: used to transmit rotary motion between parallel shafts that are slightly misaligned.
Slider-crank linkage: used to convert rotary motion to linear motion or vice versa in engines, pumps, compressors, etc.
Elliptical trammel: used to draw ellipses by fixing one slider and moving the other slider along a perpendicular guide.
Scotch yoke: used to convert rotary motion to linear motion with constant velocity by fixing one slider and moving the other slider along a circular guide.
Whitworth quick return mechanism: used to convert rotary motion to linear motion with different speeds in forward and return strokes by offsetting one slider from the axis of rotation of the link.
Another example of a double slider crank chain mechanism is the Scotch yoke, which is used to convert rotary motion to linear motion with constant velocity. A Scotch yoke consists of a crankshaft, a yoke, and a pin. The crankshaft rotates about a fixed axis and has a pin that connects to the yoke. The yoke has a slot that slides along the pin as the crankshaft rotates. The yoke also has another pin that connects to a slider, which moves along a fixed guide. The rotation of the crankshaft causes the slider to move back and forth along the guide with constant velocity, thus converting rotary motion to linear motion. A Scotch yoke can also be seen as an inversion of a double slider crank chain mechanism, where one of the sliders is fixed and acts as a frame for the other slider and the link.
A Scotch yoke has some advantages and disadvantages compared to other mechanisms that convert rotary motion to linear motion. Some of these are:
Advantages:
It produces a pure sinusoidal motion with constant velocity and no acceleration.
It has fewer parts and less fric