What is the crank connecting rod mechanism?

The crankshaft con-rod mechanism transforms reciprocative motion to rotational motion. The con-rod connects the piston to the crankshaft to transfer combustion pressure to the crankpin. There are bearing portions at both ends, the piston side is called the small end, and the crankshaft side, the big end.

What is crankshaft and its function?

The crankshaft is essentially the backbone of the internal combustion engine. The crankshaft is responsible for the proper operation of the engine and converting a linear motion to a rotational motion. Crankshafts should have very high fatigue strength and wear resistance to ensure long service life.

What are the functions of the connecting rod?

The connecting rod converts the linear up and down movement of the piston into the circular motion of the crankshaft and is therefore subject to tension, compression, bending and buckling.

What are the four types of connecting rods?

Following are the types of connecting rod, used in various types of engines: Plain type rod. Fork and blade rod. Master and slave rod.

  • Plain Type Rods.
  • Fork and Blade Rods.
  • Master and Slave Rods.
  • Billet rods.
  • Cast Rods.
  • Forged Rods.
  • Powered Metal Conrods.

What are the advantages of using a crank?

Advantages of crankshaft:

Greater efficiency. Provides smooth running of an engine. Provides better torque. Increases engine power.

What are the forces acting on connecting rod?

Following are the forces acting on connecting rod (i) Force on the piston due to gas pressure. (ii) Force due to inertia of the connecting rod and reciprocating mass. (iii) Force due to friction of the piston rings and of the piston.

What are the 4 parts of the crankshaft?

A crankshaft comprises the following components:

  • Main journals.
  • Crank pins.
  • Crank webs.
  • Counterweights.

What are the three types of crankshaft?

Types of Crankshaft

  • Cast Cranks. These types of cranks are around for a long time and are found in a lot of diesel and petrol engine.
  • Forged Cranks. These are a more robust crankshaft than a cast crank.
  • Billet Cranks. Billet cranks are the best type of crank you can have in your engine if you want to get the most from it.

What are the parts of a crankshaft?

A crankshaft consists of crankpins, crank webs (crank arms or cheeks), balancing weights, and main journals. The large end of the connecting rod is attached to the crankpin of the crankshaft. During one stroke, the center-to-center distance between the crankpin and the crankshaft is half of the piston displacement.

Where are crankshafts used examples?

A crankshaft is a mechanical part that is used to convert the reciprocating motion of a piston into rotational motion.
Examples of Crankshaft

  • Diesel Engines.
  • Electric Generators.
  • Internal Combustion Engines.
  • Drive Camshafts.
  • Transmit Power to Parts of an Engine.
  • Motorcycles.

Which metal is used in crankshaft?

This steel is suitable for forging and. A failure investigation has been conducted on three cases of failed diesel engine crankshafts used in train and made up of forged carbon steel.

What are the disadvantages of a crank?

Disadvantages of crankshaft:
Failure of bearings may occur. The total cost of manufacturing is high. Friction is increased which results in the heating of the crankshaft.

Why is crank length important?

Crank length can be used as a tool to improve fit related issues impacting comfort, power, and aerodynamics. Moving to a shorter crank can improve: Comfort: A shorter crank length reduces range of motion at the knee (extension and flexion), hips, and low back.

What are the forces acting on crankshaft?

There are two kinds of forces acting on the crankshaft – 1. Gas pressure forces, 2. Inertial forces. The gas pressure forces are caused due to the combustion in the engine during the power stroke.

What type of bearing is used on connecting rods?

Plain bearings are used in main bearings and connecting rod bearing. Its main application is in the piston and connecting rod in engine.

What is another name for a crankshaft?

In this page you can discover 16 synonyms, antonyms, idiomatic expressions, and related words for crankshaft, like: connecting-rod, camshaft, cylinder-head, propshaft, pushrod, stator, axle, carburettor, con-rod, and headstock.

What are the types of crankshaft?

Types of Crankshaft

  • Single Piece Crankshaft. As the name itself suggests, a single piece crankshaft is built by a solid single piece of material.
  • Built-up Crankshaft.
  • Semi-built Crankshafts.
  • Forged Crankshafts.
  • Welded Crankshafts.

How thick is a crankshaft?

The case thickness is usually quite thin (0.10 to 0.20 mm), although at least one crankshaft manufacturer has developed a way to achieve nitride layer thickness approaching 1.0 mm.

What are the different types of crankshafts?

There are three different types of cranks you can use in an engine.

  • Cast Cranks. These types of cranks are around for a long time and are found in a lot of diesel and petrol engine.
  • Forged Cranks. These are a more robust crankshaft than a cast crank.
  • Billet Cranks.

What are advantages of using a crank?

Without the crank (handle) it would be very difficult or even impossible to wind the spring inside the player. The crank acts like a lever, increasing mechanical advantage (the distance between the handle and the central shaft is increased – this makes it easier to turn).

Do shorter cranks make a difference?

‘Shorter cranks will almost certainly help most riders be more comfortable on a bike,’ he adds. ‘They help soften the impact of cycling on the body. Think about it: the equation is 2πr, so crank length changes that circle significantly, and going shorter appreciably reduces the range of joint movement.

Are shorter cranks better?

Conversely, switching to shorter cranks could potentially have some benefits. “If you struggle with knee or back problems on the bike, shorter cranks might help”, says Burt. “Not because they directly fix the problem, but because shorter cranks put less load on your joints and hip flexors.”

What are the stress on crankshaft?

AXIAL stresses come on the shaft from the propeller side, also the hogging and sagging of the shaft. Axial vibration damper is fitted to dampen such stresses. Shear stresses are developed when the crankpin is in stress due to compressive forces developed by the combustion gases.

Which material is used for crankshaft?

Most modern crankshafts are located in the engine block. They are made from steel or cast iron, using either a forging, casting or machining process.

Which bearing is used in crankshaft?

Plain bearings
Plain bearings absorb the axial and radial forces, redirecting them to the bearing housing. Plain bearings are used both for rotating shafts: crankshaft.