Single Slider Crank Mechanism: Definition and Inversions

By Deepak Yadav|Updated : October 31st, 2022

A mechanism is something that converts input forces and motion into the required set of output forces and motion. Mechanisms consist of moving parts such as gears and gear trains, belts and chain drives, cams and followers, linkages, and so on. Friction devices like brakes and clutches; structural components such as frames, bolts, bearings, springs, lubricants, Splines, pins, and keys are examples of machine elements.

Single Slider Crank Mechanism PDF

Inversion of the Single Slider Crank Mechanism occurs when a slider-crank linkage's connecting rod, or coupler, becomes the ground link, connecting the slider directly to the crank. This inverted slider-crank linkage is a type of slider-crank linkage that is frequently used to actuate a hinged joint in construction equipment such as a crane or backhoe, as well as to open and close a swinging gate or door.

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Single Slider Crank Mechanism

The single slider crank mechanism is a four-bar linkage with a rotating crank attached to a slider that moves in a straight line. This mechanism is made up of three major components: the crank, which is the revolving disc, the slider, which slides inside the tube; and the connecting rod, which connects the pieces. The single slider crank mechanism is one of the high-scoring topics of the GATE ME syllabus. The connecting rod drives the wheel around for the first 180 degrees of wheel rotation while the slider travels to the right.

A mechanism is typically part of a larger mechanical system or machine process. A mechanism can also refer to an entire machine, such as a vehicle's steering mechanism or a watch's winding mechanism. On the other hand, a machine is frequently characterized as a collection of multiple mechanisms.

The double slider crank mechanism is also possible if two sliders are present in the mechanism. The connecting rod pushes the wheel around to complete the rotation when the slider begins to move back into the tube.

Single Slider Crank Mechanism

Inversions of Single Slider Crank Mechanism

A mechanism is formed when one of the links in a kinematic chain is fixed. So, by fixing distinct links in a kinematic chain, in turn, we can generate as many mechanisms as the number of links in a kinematic chain. Inversion of the mechanism refers to the process of getting alternative mechanisms by fixing different links in a kinematic chain. The single slider crank mechanism inversions are used to formulate various questions in the GATE question paper. Various inversions of this mechanism are also important from the exam perspective.

First Inversion of Single Slider Crank Mechanism

This inversion occurs when connection 1 (the ground body) is fixed. Applications include reciprocating engines and reciprocating compressors. Let us see the diagram of the first inversion of the single slider crank mechanism provided below:

First Inversion of Single Slider Crank Mechanism

Second Inversion of the Single Slider Crank Mechanism

When link 2 (crank) is fixed, this inversion mechanism occurs. Whitworth rapid return mechanism, Rotary engine, and so on. The diagram of this mechanism is:

Second Inversion of the Single Slider Crank Mechanism

Third Inversion of the Single Slider Crank Mechanism

This inversion occurs when link 3 (the connecting rod) is fastened. Third inversion of single slider crank mechanism is shown below. Applications include slotted crank mechanisms and oscillatory engines.

Third Inversion of the Single Slider Crank Mechanism

Fourth Inversion of the Single Slider Crank Mechanism

When link 4 (slider) is fixed, this inversion occurs. Hand pump, pendulum pump, or bull engine, for example. Fourth inversion of the single slider crank mzechanism os shown in the diagram provided below:

Fourth Inversion of the Single Slider Crank Mechanism

Single Slider Crank Mechanism Applications 

A slider-crank mechanism is a mechanical arrangement that converts straight-line motion to rotary motion, as in a reciprocating piston engine, or rotary motion to straight-line motion, as in a reciprocating piston pump. These applications are descreetly elaborated in the GATE notes. The applications of a single slider crank mechanism are as follows:

  1. Reciprocating Engines/Pumps: The slider-crank mechanism of reciprocating engines/pumps converts straight-line motion to rotary motion and vice versa.
  2. Combustion Engines: A slider-crank mechanism is utilized in combustion engine piston cylinder assemblies to convert reciprocating motion into circular motion and vice versa.
  3. Rotary Engines: By securing the crank in the Slider-crank mechanism, rotary engines can be formed. Cars utilize rotary engines.
  4. Oscillating Cylinder Engine: By securing the connecting rod in the Slider-crank mechanism, oscillating cylinder engines can be created.
  5. Hand Pump: Attach the slider to the Slider-crank mechanism, which is used to create hand pumps.

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FAQs about Single Slider Crank Mechanism

  • A four-link mechanism with three revolute joints and one prismatic, or sliding, the joint is known as a slider-crank linkage. The rotation of the crank causes the slider to move linearly, or the expansion of gases against a sliding piston in a cylinder can cause the crank to rotate.

  • Slider-crank chain inversion occurs when the connecting rod, or coupler, of a slider-crank linkage, becomes the ground link, connecting the slider directly to the crank.

  • In gasoline/diesel engines and quick-return machinery, a slider-crank mechanism is commonly utilized. To date, research activities in the analysis of the slider-crank mechanism have been examined due to substantial advantages such as low cost, fewer parts, less weight, and others.

  • When one of the four-bar chain's turning pairs is replaced with a sliding pair, the result is known as a single - a slider crank chain or slider crank chain. When two of the four-bar chain's turning pairs are replaced by two sliding pairs, the result is a double slider-crank chain.

  • The twin slider-crank linkage is made up of four links connected by a kinematic chain that includes two revolute joints and two sliding or prismatic joints. One sliding limitation in this twin slider is perpendicular to the other.

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