Workings

HOW THE GEARLESS CENTRE DIFFERENTIAL WORKS

Toyota Landcruiser HZJ 75/ 78/ 79/ 70 series Transfer Case Conversion

The Gearless Centre Differential power divider converts the Toyota Landcruiser transfer case into the perfect full-time four wheel drive tranmission. A 4WD vehicle fitted with a conventional PART-TIME transfer case suffers from the destructive forces of axle wind-up when operating continuously in 4WD on hard surfaces.

Two major problems occur with standard part-time 4WD transmissions.

  1. Drive train wind-up causes wheels to continually fight each other by skipping and skidding as they attemp to equalise the torque imbalance and differences in wheel speed.

  2. The vehicle is pushed straight ahead during cornering and is therefore difficult to handle and control.

  Conventional Transfer Case - Part Time 4WD  

Full traction

Conventional Transfer Case - Part-time 4WD - replace with Gearless Centre Differential Full-time 4WD for Toyota Landcruiser from Gearing Dynamics

Wheel Skipping and Skidding

 

 

Wheel Skipping and Skidding

Full traction

Front axle and rear axle continually fight each other to maintain traction


  Gearless Centre Differential Full Time 4WD  

Full traction

Gearless Centre Differential Full-time 4WD for Toyota Landcruiser from Gearing Dynamics.com

Full traction

 

 

Full traction

Full traction

Front axle and rear axle act in balance to maintain full traction at all times.

The Gearless Centre Differential is the perfect answer for heavy duty full-time 4WD use.

  • Smooth cornering with full traction at all times.
  • Fully automatic in its lock/ unlock operation.
  • Both 2 speed (hi and Low) and Dedicated Low Range Only models are available for both the HZJ 75 and the new 78/ 79 series.

Models available for the Toyota HZJ 75/ 78/ 79/ 70 series range are:

  • A low range only model for the dedicated underground vehicles,
  • A dual range model that allows the gearbox/ transfer case to be used and shifted through high and low range as normal.

A large number of mines are now using the Gearless Centre Differential and receiving the benefits of much reduced downtime and maintenance on driveline components. Added to this are the accumulated savings on labour and spare parts like CV joints, knuckles, clutches, and diffs, etc. Our recorded information shows that one mine over 10 years has extended the life of CV joints from 300 to 2100 hours.

The unlocking/ locking torque balancing operation of the Gearless Centre Differential is completely automatic and does not require driver intervention. The elimination of tight corner braking effect, which pushes the vehicle straight on, makes the vehicle easier and safer to drive with greatly improved traction to all four wheels.

Fitting for either version takes under 3 hours without removing the transfer case. Once installed, no further adjustments are necessary apart from routine transfer case oil changes.

HOW THE GEARLESS CENTRE DIFFERENTIAL WORKS

to produce the perfect full-time 4X4 transmission

The Central Drive Assembly in a Gearless Centre Differential utilises Detroit Locker technology. These have been used in car, truck, 4WD and racing differentials for over 40 years and are well-proven for their rugged strength and durability.

Simply put, the Gearless Centre Differential transforms the transfer case into a third differential, automatically working to equalise the torque imbalance developed between the front and rear prop-shafts as the axles wind up during cornering in a 4WD.

The Gearless Centre Differential unlocking mechanism works on a teeth ramping principle between two spring loaded clutches and a Central Drive Unit.

During cornering, one prop-shaft (usually the front) tries to spin faster (winds up) as it is rotated by the faster turning outside front wheel. This produces a torque imbalance between the front output shaft and the rear output shaft of the Gearless Centre Differential.

As the wind-up builds, the Gearless Centre Differential front clutch teeth automatically slide smoothly up a cam ramp until they disengage briefly. This disengagement allows the torque to release in the prop-shaft, and once equalised, the clutch teeth automatically re-engage. All in a fraction of a second and so smooth as to be almost imperceptible to the driver who is free to concentrate on the job at hand.

The constant differential action during cornering keeps driving torque to the front and rear axles evenly balanced, eliminates driveline wind-up and prevents premature CV joint failure, driveline component wear, vehicle instability, and tight corner braking effect.

Designers and Manufacturers of Specialised Driveline Technology for the Mining Industry

 

 

Gearing Dynamics - Designers and Manufacturers of Specialised 4x4 Driveline Technology for Toyota Landcruisers. Also Greasable CV Joints, CV Boots, Exhaust Brakes, Air Suspension, Radiators

CONTACT OUR SALES DEPARTMENT TODAY

Gearing Dynamics - Designers and Manufacturers of Specialised 4x4 Driveline Technology for Toyota Landcruisers

Proven performance, reliability and service
to the mining industry for over 20 years.

26 Hume Reserve Court,
North Geelong,
Victoria, 3215      Australia

Phone: 03 5272 2844
Fax:  03 5272 2633

International
Phone: +61 3 5272 2844
Fax:  +61 3 5272 2633

Gearing Dynamics - Designers and Manufacturers of Specialised 4x4 Driveline Technology for Toyota Landcruisers. Also Greasable CV Joints, CV Boots, Exhaust Brakes, Air Suspension, Radiators

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