Common Rail Direct Injection (CRDI) System and Diaphragm Spring Clutch(GRK)

 

Common Rail Direct Injection (CRDI) System

Definition:

CRDI is a modern fuel injection system where fuel is stored at high pressure in a common rail (pipe) and injected into each cylinder by electronically controlled injectors.

Neat Sketch:



Construction:

·         Fuel Tank

·         Low-pressure Feed Pump

·         Fuel Filter

·         High-pressure Pump: Compresses fuel up to 1500–2000 bar.

·         Common Rail (Accumulator): Stores high-pressure fuel.

·         Injectors (Solenoid or Piezo): Electronically controlled for precise injection.

·         ECU (Electronic Control Unit): Controls injection timing, duration, and pressure.

Working:

1.      Fuel supply: The low-pressure pump sends fuel to the high-pressure pump.

2.      Pressurization: The high-pressure pump compresses fuel and delivers it to the common rail.

3.      Storage: The rail stores fuel at constant high pressure.

4.      Injection: The ECU signals each injector at the correct moment to deliver a precise amount of fuel into each cylinder.

5.      Multiple injections: CRDI allows pilot, main, and post injections to optimize performance and emissions.

Advantages:

·         Better fuel atomization and combustion.

·         Reduced noise and vibrations.

·         Lower emissions and improved mileage.

·         Precise control over injection.

·          

 Diaphragm Spring Clutch

Construction:

·         Flywheel & Clutch Cover: The flywheel is mounted on the engine crankshaft, and the clutch cover is bolted onto it.

·         Pressure Plate: Positioned between the clutch cover and the friction (driven) disc; connected to the cover via drive straps or lugs.

·         Diaphragm Spring: A conical steel disc with radial fingers (slots), acting both as clamping mechanism and release lever. It’s supported on a fulcrum or pivot ring, allowing lever action.

·         Friction Disc: Splined to the gearbox input shaft, it carries friction linings on both sides to engage with the flywheel and pressure plate.

·         Release Bearing & Fork: The release bearing presses on the central fingers of the diaphragm spring when the clutch pedal is pressed, actuated by the fork.



Working:

1.      Engaged State:
The diaphragm spring, in its natural conical shape, exerts force via its outer edge on the pressure plate, clamping the friction disc between the flywheel and the pressure plate. This transmits engine torque to the gearbox.

2.      Disengagement:
Pressing the clutch pedal pushes the release bearing into the diaphragm spring’s center. This flattens the spring, reduces its clamping force, causing the pressure plate to move away and disengage the friction disc from the flywheel.

3.      Re-engagement:
Releasing the pedal allows the diaphragm spring to reset to its conical shape, reapplying pressure on the pressure plate and re-establishing contact with the friction disc—restoring power flow to the transmission.

Advantages:

·         Requires lower pedal effort compared to coil-spring clutches.

·         Compact and simplified design—spring acts as both pressure and release mechanism.

·         Fewer moving parts offer smooth, quiet operation and reduced maintenance.

Comments

Post a Comment

Popular posts from this blog

CMM (Coordinate Measuring Machine)

Image
  CMM (Coordinate Measuring Machine) Include Discontinued Series Product Lineup Handheld Probe Coordinate Measuring Machine  XM series The XM Series is a handheld coordinate measuring machine (CMM) that lets anyone easily measure 3D/GD&T features. The system is portable and shop-floor ready, so measurements can be taken in any location. The unit also automatically records measurement data and creates detailed inspection reports. The images showcases our latest XM-5000 model which allows high-accuracy measurement for palm-sized parts to large applications. Wide Area Coordinate Measuring Machine WM series The WM Series Coordinate Measuring Machine is a new handheld CMM designed accurate 3D and GD&T measurements over a large 15m (49 ft) area. Similar to the XM Series, the unit is portable and shop-floor ready, so measurements can be taken in any location including in the machine tool. The unit also automatically records measurement data and creates detailed inspection rep...
Read more

EV Charging station Market Analysis

 EV Charging station Market Analysis In the first phase of Electric Vehicles (EV) rollout plan, the power ministry is targetting 4 billion-plus population cities under the EV policy initiative. It plans to cover all the state capitals, union territories, major highways and key cities under the second phase. The electric vehicle charging infrastructure market in India is anticipated to grow at a CAGR of over 40% during the forecast period 2019-2025. Increasing government support is one of the major factors driving the electric vehicle charging infrastructure market in India. Based on component, the electric vehicle charging infrastructure marketing India is segmented into hardware and software & services. Hardware comprises sockets, cables, and charging units. Software & services include installation and maintenance of charging units, platform as a service, and other services. Other services include battery delivery service and towing service, which are in a very nascent sta...
Read more

Cochran Boiler

Image
  Cochran Boiler:  Definition, Parts or Construction, Working Principle, Advantages, Disadvantages, Application Cochran Boiler is a simple  fire tube boiler  with multiple fire tubes. It is a modification of a simple vertical boiler. In the Cochran boiler, the heating surface is replaced with multiple fire tubes that’s why it is the modification of Simple Vertical Boiler. Cochran boiler has greater efficiency comparatively Simple vertical boiler. Here in this article, we are going to study  Definition, Parts or Construction, Working Principle, Advantages, Disadvantages, and Application in very detail. Cochran Boiler Definition: Cochran boiler is a fire tube boiler (Fire inside the boiler and water surrounding them) in which coal or gases as a working fluid is used, for generating the steam,   and that steam is   further used for several purposes. Now comes to the construction, Cochran Boiler Parts or Construction: Cochran Boiler consists of the followi...
Read more