Download scientific diagram | Moulton’s Hydragas suspension system [21] from publication: Recent developments in passive interconnected vehicle suspension . Find great deals on eBay for mgf hydragas suspension. Shop with confidence. Hydragas suspension (Moulton-Dunlop) the conical piston and the tapered displacer chamber skirt as the suspension deflects up and down when the wheels.

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The majority of units are now over 30 years old and most are so low on gas that the ride quality sjspension give is now severely compromised. His conclusion was basically that he would not want to drive it on anything other than dead-smooth tarmac. He gave us some suzpension into the development of the Car of the 20th Century – and his opinion on the BMW Mini of the 21st century.

These are, in essence, miniaturised versions of the displacers used on Hydrolastic-equipped cars being a rubber cone spring with an internal fluid chamber to provide damping.

Hydragas Suspension

Automatic transmission Chain drive Clutch Constant-velocity joint Continuously variable transmission Coupling Differential Direct-shift gearbox Drive shaft Dual-clutch transmission Drive wheel Electrohydraulic manual transmission Electrorheological clutch Epicyclic gearing Fluid coupling Friction drive Gear stick Giubo Hotchkiss drive Limited-slip differential Locking differential Manual transmission Manumatic Parking pawl Park by wire Preselector gearbox Semi-automatic transmission Shift by wire Torque converter Transaxle Transmission control unit Universal joint.

Society of Automotive Engineers. In this later version of the interconnection principle, the rubber cone was replaced by using a gas under pressure.

The system replaces the separate springs and dampers of a conventional suspension system with integrated, space efficient, fluid filled displacer units which are interconnected between the front and rear wheels on each side of the vehicle.

From Wikipedia, the free encyclopedia. The Suez crisis occurred in and petrol rationing meant that tiny bubble cars, mostly of German manufacture and including some BMW-Isetta models, began to flood the roads.

This page was last edited on 30 Octoberat Please help improve this article by adding citations to reliable sources.

The whole of the Midlands was committed to the new project. With the original Mini, we set out to prevent any accidents by having excellent handling, not by cushioning people from the consequences of their own folly The old Mini was the absolute apogee of this philosophy of built-in safety via the handling suspensiob avoided accidents by driving around them.


A forward-travelling car will first encounter disturbances at the front wheels that tend to lift the front of the car in relation to the rear.

The Austin Maxi was the suepension in production car to feature both systems. They had total authority from Lord: Articles needing additional references from June All articles needing additional references.

I had previously designed the rubber cone suspension system — it was a specially shaped rubber and metal unit that gave a smoothly rising spring rate.

OK, there were some small problems, such as the floorpan hydragxs, but when you think of all the technical innovation in that one small vehicle, it was amazingly right, and look how little fundamental change it then needed in the following 40 yearsl The next suspension innovation for the Mini was the Hydrolastic system introduced to the saloon models in They particularly wished to address the comical lack of roll stiffness of that car with the system that they were designing.

It was first introduced in in the Austin Allegro and was later fitted to the Princess and its successor, the Austin Ambassador. Hydragas was never fitted to a production Mini, but Alex Moulton has some fascinating prototypes in his stable: Past and Future — Institution of Mechanical Engineers.

Figure 1 [2] depicts a later-generation Hydragas unit. Reducing the differential between front and rear forces on the car body induces more of a bounce mode euspension vibration than a pitching mode.

Three models were developed to predict forces transmitted through the units.

The first was a linear model that showed reasonable accuracy over restricted frequency ranges. BMC took a shareholding and paid all the costs of development. It was a great success, and Ford in particular were very upset by it. Issigonis was determined that he should have interconnected fluid and rubber suspension on his Alvis. Automobile Division, Amazingly. In an interconnected, or “equalising” suspension, the front and rear wheels on each of the driver and passenger sides are interconnected, forming two independent systems wherein an input at one wheel will cause a force to be generated at the other.

However, in production of Hydrolastic bottles at Dunlop came to an end and BL modified the Princess Hydragas bottles to fit. It had been driven over miles on the pave at MIRA, an unimaginably tough test that the standard car would not have been able to withstand.

The Hydragas System Designers have considered for decades the interconnection of the front and rear wheels as a means by which to reduce hydrragas pitch behaviour of small cars. I had heard of Alec Issigonis by reputation and we met socially before we worked together. Hydragas was introduced with the unloved Austin Allegro in the s and is still in use on roads today fitted to the MGF.


The magnitude of the mass was estimated based on the areas of the damper force vs. The only “give” in the suspension occurs because of the inherent flexibility of the rubber springs.

Hydrolastic – Wikipedia

Electric motor Hybrid vehicle drivetrain Electric generator Alternator. The crash protection has been taken too far. Cars hydravas the Hydrolastic suspension system: The displaced fluid passes to the displacer of the paired wheel, thus providing a dynamic interaction between front and rear wheels. No flow occurs from one unit to the other, with flow occurring only between the upper and lower chambers of individual units through the damper valves.


The system uses nitrogen gas as the springing medium and hydraulic fluid pressure drop as the damping mechanism. Princess Diana suspensiin killed in a two-tonne Mercedes: This gives the suspension a sharply rising rate even in pitch, so that there is a strong tendency to return to equilibrium.

A special collar is then welded to the displacer, a high pressure Schrader valve is fitted and the unit charged with fresh Nitrogen to the original specified pressures, the unit is again thoroughly tested for fluid and gas leaks.

Invented by Suspensuon automotive engineer Alex MoultonHydragas is an evolution of the previous Hydrolastic system. Interconnection has striven to transmit some the upward hydrgas motion of the front wheel into suuspension downward force exerted by the sprung mass on the rear wheel, through susppension rear suspension. We never thought about racing during the design phase; we were worried about safety, particularly when the car was overloaded with lots of students aboard or such like.

After servicing the spares market for some years a buyer was found and the production line was sold. Retrieved from ” https: The original] Mini was the best-packaged car of all time this is an example of how not to do it. Before we start work we thoroughly check the unit s for fluid leaks, we then drill into the gas chamber to release what’s left of the old gas and provide the means of entry for the new gas.