SERVICING UNIVERSAL CROSS JOINTS




Cardan universal joints allow power to be transferred at larger angles than traditional flexible couplings. They can transmit power at up to a 15° offset angle depending on the application. Cardan shafts are available in a wide variety of torque capacities from 4.4 ft-lb (5.9 Nm) to 11,071,745 ft-lb. (15,009 Nm). There are many different styles of cardan shafts. The cross and bearing, ear and pin and Cornay joints are a few. Cross and bearing joints are the most common and use needle bearings to allow movement of the flange. Ear and pin joints, also known as pin and block joints, are simpler in design and are used for smaller applications. Cornay joints allow torque to be transmitted at high angles, even up to 90°.


The cross joint is mostly used in a rear wheel drive because it has more power and larger as it can handle more horse power.

CV JOINT


Servicing Constant Velocity Joints


-Today the class and i removed a CV joint from the drive shaft.To remove the CV we use a tool called the sliding hammer, this tool is very useful to remove the CV joint. When the CV joint came off it had rust, cracks, scratches and hammer marks. The balls inside were very dirty as the grease was very black and needed to be cleaned, so we did. As we were using the hammer to removed the CV joint off, the drive shaft, we had overall,steal cap and glasses on for safety reasons.




The sliding hammer




CV Joint



Close up on CV Joint 



Things inside a CV Joint




CV Joint Cage 



Inside a CV Joint





-A CV joint, or constant velocity joint, is part of a drive shaft, the shaft that attaches to a car's transmission at one end and the wheel at the other. CV joints are designed to be able to bend in any direction while continuing to turn the drive wheels at a constant velocity. CV joints are primarily used in the drive shafts of front wheel drive cars.

-Due to bumps and uneven surfaces in the road, a car's wheels tend to move up and down continuously while driving down the road; as a result, drive shafts cannot be made up of a solid shaft. The CV joint's precursor, the universal joint, was used in the drive shafts of rear wheel drive cars because of its ability to bend in any direction. With the advent of front wheel drive cars, however, car manufacturers had a new problem: the joints in the drive shafts needed to account not only for the up-and-down motions of the wheels, but also for the back-and-forth motions of steering. The CV joint is used in front wheel drive cars because of its ability to maintain a constant drive force to the wheels despite the many different kinds of movements in the front end of the car. The CV joint is often used in rear wheel drive and four-wheel drive cars, as well.



-CV joints should be inspected periodically and may require replacement as a car ages. A CV joint is covered with a bulbous rubber boot that tends to deteriorate over time. When a CV boot cracks or tears open, the CV joint is left exposed to the elements, which will quickly damage the joint. If the CV axles are inspected periodically, torn boots can be replaced as needed, potentially extending the life of the joints; however, if torn boots are left unattended, the joint or the entire axle may soon need to be replaced.



CV Boot

The rubber part of the driveshaft assembly / CV Axle is known as the CV boot, which is secured with stainless steel clamps. We call it cv boot clamp. The purpose of CV boot is to protect the internal components of the CV joint by retaining the lubricant, and also acting as a dust shied.

Health and Safety
HAZARDS





Scolding
Don't remove the radiator or expansion tank cap while the engine is hot.
Same as engine oil, automatic transmission fluid or power steering fluid if the engine has recently been running.

Burning
Beware of burns from exhaust system and any part of the engine plus brake discs and grums.

Crushing
Never venture under a car which is only supported by a jack. Initial looseing and final tightening should be done with the wheels on the ground

Fire
Fuel is highly flammable, fuel vapour is explosive too. So don't let fuel spill onto a hot engine and don't smoke or allow naked lights anywhere near a vehicle being worked on.

Electric Shock
Ignition High Tension voltage can be dangerous to people. Don't work on or near the ignition system with the engine running or the ignition swithched on.

Fume or Gas Intoxication
Exhaust fumes and Fuel vapour are poisonous,never run the engine in a closed space such a garage with the doors shut.

Poisonous or Irritant Substances
Avoid skin contact with battery acid and with any fuel, fluid or lubricant, especially antifreeze, brake hydraulic fluid and diesel fuel. If such a substance is swallowed or gets into the eyes, seek medical advice.

Asbestos
Asbestors can cause cancer if inhaled or swallowed.beware when you dealing with in gaskets and in brake and clutch linings,some of them may can be founded.

Air Bag
Air bags can cause injury if they go off accidentally. Take care when removing the steering wheel. Storage instructions may apply.

Diesel Injection Equipment
Diesel injection pumps supply fuel at very high pressure. Take care when working on the fuel injectiors and fuel pipes.



Health and Safety project.

Health and Safety exercise, you need to read the booklet and fill in the missing words

The Law

Both the employer, Unitec Institude of Technology and its student have statutory obligations under the Healthand Safety in employment Act 1992 and all its amendments.




Health and Safety part 1



Employer Duties Include:

To take all practicable steps to:
Provide a safe working environment.
Provide procedures dealing with emergencies.
Provide facilities for staff that include toilets and rest rooms, also first Aid facilities.
Employees receive appropriate training in matters.
Students Duties include

Taking responsibility for your own safety and health at work.
Ensuring that your action or inaction does not harm others.
Reporting all injuries or near hits to your supervisor as soon as possible after the event.


Hazards

To help reduce the health and safety risks in our workplace we need you to report any hazards  that you mayidentify that have the potential to cause injury or serious harm
Report the problem to your supervisor immediately so that the risk can be analysed and preventative action taken.
Who is your Health and safety representative Rob Humphreys


Health and Safety part 2


Read and explain in your own words the FIRE and EVACUATION process including
were you should meet if there is a fire, what colour vest do the fire wardens were?


Health and Safety part 3

Need to do the presentation on student safety responsibilities this can be done in a group active on in peers.



Health and Safety part 4