Using Jacks & Hydraulic Hoists

Using Jacks & Hydraulic Hoists

Using a Jack safely:

• Never jack a vehicle up on an uneven surfaces.
• Ensure that the jack is safe to use before using it.
• When jacking up a vehicle take your time so the car doesn't come off the jack & also to make sure it is being jacked up in the right place & nothing is getting broken in the process.
• depending on where the vehicle is being  jacked up front or back is depending on weather the vehicle is left in park or the hand break is on.
• Jacking up the front - The hand break needs is needed to be on & chocking the back wheels for extra safety is all ways good.
• When jacking up the back - The vehicle should be in park or reverse & the front wheels should be chocked for extra safety.

The following photos will show how this is done:

 On the left - This is showing that the jack is in the incorrect place.
With jacking the vehicle up on this point could result in the vehicle to possibly slip off the jack. It is a strong point to jack up on but slipping off the jack is possible.

On the right - The jack is in the correct place to jack up the vehicle. 

On the left - Is a close up of the above pic.

As you can see the jacking point of the vehicle has been designed so the vehicle can not slip off the jack but have some grip to it. This helping the jack to work properly & move forward as the car the raised.

When jacking up the back end of the vehicle,Be sure you don't jack up on the tyre well or where the toe bar connects underneath the vehicle.
We want to find a strong point so using a well braced solid point of the car. In most case's you can you use the diff.

Placing Axel Stand 

With placing axle stands the same principle applies as to the jack.
These need to be placed at the strong and supported part of the vehicle.
Usually these would placed on the axle but can also be placed on the solid/ well supported underneath of the vehicle. 

Hydraulic Hoists

Most if not all of the hydraulic hoists now are built with a safety locking system.

On the left is showing how many locking points is on one hydraulic hoist.

This is on an four post hoist & each post has safety locks on it.

When driving a vehicle on one of these there should be someone there to guide you on to the hoist.

On the right - is an extra extension on the hoist so we were able to lift the vehicle again on the hoist as it is all ready lifted.
This is so if we needed to remove the wheels while all ready up on the hoist.

Another hoist that we looked at was the one on the left.
Using the rubber blocks placed to where we would place a standed car jack, Then slowly lifting the hole car up. 

This jack is designed to either work just under the front, back or to replace the brakes.

DSG Transmission Assignment

DSG Transmissions

Certificate in Applied Technology  TTEC 4844 Russell Clarke

Contents

Page 1 Cover

Page 2 Contents

Page 3 History

Page 4 full Operation

Page 5, 6 & 7 Internal Components

Page 8 & 9 Disadvantages

Page 10 Advantages

Page 11 Where Information was Found

History

DSG history:

Porsche was the first company to invent DSG (Direct Shift Gearbox) more than 20 years ago. They stopped using DSG on their cars because of the significant power that their current models put out.

It was also said that the DSG was designed by Borg Warner & licensed to the Volkswagen Group.

Full Operation

DSG provides the driver with a far smoother ride with such easy gear changing on an automatic transmission.

This Trans is the first to have twin/ double clutches that allow an efficient gear change.

The DSG has 2 clutches, one for the even gears & one for the odd gears plus reverse.

One clutch is engage & the other one preselects the next gear, this allows a far faster change between gears. When the car is in 2^nd gear the other clutch has 3^rd selected but not engaged & soon as the RPMs are reached for the idle shift point then 3^rd is so quickly if not instantly engaged.

This allows the DSG to have faster shift times.

Due to space being an issue the two clutch assemblies had to be concentric – this meaning one within the other.

Clutch two being hollowed out & holding clutch one inside of it.

Each clutch pack has 4 smaller clutch discs instead of the normal single large clutch plate found in most gearboxes. This allows the gear changing to be 8 milliseconds to upshift instead of hundreds of a second.

Internal Components

DSG is two separate manual gearboxes and clutches. This is all cased within one housing and works as one unit, by using two separate clutches.

The outer clutch drives gears 1, 3, 5 & reverse. This clutch is larger compared to the inner clutch & can handle bigger torque loadings.

The inner clutch drives 2, 4 & 6, also instead of a single plate clutch, on the six speed there are 4 small wet interleaved clutch plates.

A wet clutch plate has a cooling lubricant fluid which not only cools the clutch plates but also keeps the surfaces clean & helps with a smoother performance & also a longer life.

“P” – is understood better as (Park), When the transmission is selected to park. Both the clutch packs are all fully disengaged & a solid lock is applied to the parking gear/ planetary output.

Natural is the same as park but there is absolutely no gears selected what so ever.

“D” – Drive, when this gear is selected the outer clutch is engaged into 1^stgear & the inner clutch has preselected 2^nd, as the change in gears is made from 1^st to 2^nd, the outer clutch will then preselect 3^rd & the inner clutch is already selected into 2^nd.

Inside the gearbox consist of: 6 gears – 1, 2, 3, 4, 5 & 6

4 shift forks, each shift fork controls a couple of gears.

1 x fork controls 2^nd & 4^th

1 x fork controls 1^st & 3^rd

1 x fork controls Reverse & 6^th

1 x fork controls 5^th

2 x input shafts & a reverse idler

1 input shaft that consist of 2, 4 & 6 gears & the other input shaft consist of 1, 3, 5 & Reverse. Instead of having 3 synchronisers to a 5 gear system, there are 4 to this 6 gear system. 5^th gear having its own synchroniser & shift fork.

Disadvantages

It is said by one critic that the DSG is heavier than an ordinary transmission, manual or normal automatic. They have higher replacement costs, lower reliability.

The DSG should also provide better performance on the TDI, but being a heavier transmission the power loss take away performance compared to other transmissions.

In 2009 & 2010 the VW Audi DSG S – Tronic recalled the temp sensor for some of the models of their cars that were made in between September & August 2009. A faulty temp sensor can result in dashboard lights flicking on & off, also the transmission can shift out of drive, staying in neutral & not shifting back.

The main problems I could find were due to the transmission being heavier & more expensive overall – Mechanically & on the oils & lubricants.

Also if you wanted to change down gear while hill climbing the RPMs have to be higher than 3000 or 4000 RPM, to be able to trigger the kick down switch.

Hans has also found the following disadvantages:

The main limitation of the twin-clutch/DSG is the same as all geared transmissions: Because there are a fixed number of gears, and the transmission cannot always keep the engine at its best speed for maximum power or maximum fuel economy. Because of this, twin-clutch transmissions generally cannot extract as much power or fuel economy from an engine as a continuously-variable automatic transmissions (CVTs). But because twin-clutch transmissions provide a more familiar driving experience than CVTs, most drivers prefer them. And while the twin-clutch provides superior performance compared to a manual, some drivers prefer the interaction that a manual clutch pedal and gearshift provide.

Advantages

Short up shift times of 8 milliseconds, when shifting into a gear that has been preselected. This also makes the gear shifting run a lot smoother.

There is no loss of torque from the transmission to the engine then from the engine to the wheels, during the gear shifting.

Being able to shift gears faster this also gives the car faster throttle response & lively handling with unbroken acceleration.

It gives you safer driving with the power to get you out of a tricky situation.

Improved fuel economy even compared to a manual gearbox.

Where information was located

All information was found on the following sites:

Ehow

Wikipedia

Audi

VW

About cars

I used Google to find all of these sites