For this operation a special piece of equipment, namely a Hydrolastic Suspension Service unit, is required. Such units are generally available for hire, together with suitable suspension fluid, from most tool hire shops. In most cases, instructions for operating the unit are supplied with it and are normally printed on the top of the unit. These instructions should be read through carefully before attempting to use the unit, and followed accurately throughout the operation. The unit consists basically of a vacuum pump, a pressure pump and a fluid reservoir. The Hydrolastic system pressure valves are located at the rear of the car on the sub-frame crossmember.

Author:Moogur Kizil
Language:English (Spanish)
Published (Last):8 September 2009
PDF File Size:4.58 Mb
ePub File Size:7.17 Mb
Price:Free* [*Free Regsitration Required]

Dajar The pressure tank on the unit should be pumped up to the system specified working pressure before opening the connector valve, which will already have been connected to the system pressure valve. It arrived overly pumped up with ridiculous ground clearance — even the dealer let it through the PDI like that. One obvious development that would be necessary for incorporation in a hydragas circuit, is dual flow: The unit consists basically of a vacuum pump, a pressure pump and a fluid reservoir.

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. You are commenting using your Facebook account. This page was last edited on 30 Octoberat However, in production of Hydrolastic bottles at Dunlop came to an end and BL modified the Princess Hydragas bottles to fit.

Hydragas is a type of automotive suspension system used in many cars produced by British Leyland and its successor companies. Further, the public were less and less interested in the pleasures of a smooth riding car; somehow a harsh ride was associated with sportiness and performance while ride-quality became the preserve of the non-sporty. These are then linked fore and aft; the left front linked to the left rear, along with the right front linked to the right rear.

The suspension was also of advanced design, with trailing arm front suspension attached to a steel cross-member, and swing axle rear, all with rubber springs made of catapult elastic.

To achieve the highest velocities the ratio of the diameter of the wheel and the diameter to the center of the nozzle should be as small as possible.

All you students out there looking for a masters degree project, give us a call. The car ride height is governed by the Hydrolastic system pressure and should be checked with the car resting on level ground and a load condition as described above systeem pressurising the system. The operation of both systems is the same, operating in the same dimensional space. This makes the unit cheaper and reduces the amount of gearing necessary. If a different pressure reading is now indicated, the system pressure should be adjusted by operating the pressure pump to raise the pressure, or opening the pressure sysyem on the unit to lower the pressure, until the specified figure is obtained.

This involved fitting a new front subframe design,with a larger diameter horizontal chamber in the subframe. This effect is particularly good on small cars as their shorter wheelbases are more affected by pitching. Cannot help but think that properly commercialized and reduced in cost, this might be as good as you can get without going completely mad.

When servicing suspension bearings and joints using the sysrem cone hydrolastic and hydragas system s it is necessary to de-pressurize the fluid to effect replacements. Hydrolastic The result is that the floorpan stays level: They worked together on rubber and hydrolastic suspension — to give the UK some huge motoring successes. That vehicle used two springs separated by a tight-fitting rubber piston in a cylinder alongside the sills, each spring connected to a swing-arm by a push-pull rod.

Later, he was responsible for the Hydrogas system, which was developed for the Austin Allegro car and is still in use on the Rover series and the MGF. TOP Related Posts.


Car suspension

Description [ edit ] 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. Each displacer unit contains a rubber spring, and damping is achieved by the displaced fluid passing through rubber valves. The displaced fluid passes to the displacer of the paired wheel, thus providing a dynamic interaction between front and rear wheels. When a front wheel encounters a bump fluid is transferred to the corresponding rear displacer then lowers the rear wheel, hence lifting the rear, minimising pitch associated with the bump. This effect is particularly good on small cars as their shorter wheelbases are more affected by pitching. Hence it is possible to design a compliant suspension - giving a comfortable ride - without suffering a penalty in terms of excessive roll when cornering.



Bottoming or lifting a wheel can cause serious control problems or directly cause damage. The control problems caused by lifting a wheel are less severe if the wheel lifts when the spring reaches its unloaded shape than they are if travel is limited by contact of suspension members See Triumph TR3B. Many off-road vehicles , such as desert racers, use straps called "limiting straps" to limit the suspensions downward travel to a point within safe limits for the linkages and shock absorbers. This is necessary, since these trucks are intended to travel over very rough terrain at high speeds, and even become airborne at times. Without something to limit the travel, the suspension bushings would take all the force when the suspension reaches "full droop", and it can even cause the coil springs to come out of their "buckets" if they are held in by compression forces only. A limiting strap is a simple strap, often nylon of a predetermined length, that stops the downward movement at a preset point before the theoretical maximum travel is reached.

Related Articles