A Controllable Differentiation Differential Mechanism, with Undulated Planet - Gears

(Introduction, Description, File Library)

1. Introduction

On Friday 17th of September 2004, Mr. Theodore Tsiriggakis together with his son named Vasileios T. Tsiriggakis have applied, in the Hellenic Intellectual Property Agency in Athens (Hellas), for a new patent application called "Controllable Differentiation Differential Mechanism with Undulated planet-gears" or "Differential mechanism, of controlled Differentiation, with curved Gears". The patent application number (PAN) of the new Tsiriggakis kinematical theory and its applications is 20040100369. However, for simplicity reasons we often refer to it as "The New Tsiriggakis Differential Mechanism"

The importance of the New Tsiriggakis' Differential Mechanism led us to immediately publish, in our official Web Page, more information.

On April 2005 the first article that briefly presents the new Tsiriggakis Differential has been published.

On 13th of September 2005 the inventors: Mr. Tsiriggakis Theodoros and Mr. Tsiriggakis Vasileios have applied for an international patent (IAN: PCT/GR2005/000028) concerning the "Controllable Differentiation Differential Mechanism, with Undulated Planet - Gears".

The filed material is available for downloading in pdf format. PCT Application Form, Description - Claims - Abstract, Figures.

On Tuesday, 14th February 2006 information about the new Tsiriggakis Kinematical theory and its applications were submitted to the IRC's (International Relay Center) Database of Technology - Science and Innovation. (click here to learn more...)

On 23rd of March 2006 the international patent application was published (IPN: WO/2006/030247 A1).

For more information concerning the historic events concerning The New Tsiriggakis Differential Mechanism please click here.

2. Description of the new Tsiriggakis Differential

In order to analyse how the new Tsiriggakis Differential works, we must refer to the conventional differential and to the Tsiriggakis' Gearless Differential as well.

The new Tsiriggakis Differential Mechanism is based on a new kinematical theory, which is an harmonic combination (hybrid) of the kinematical theory of Gearless Differential (theory of envelopes and curves) and the kinematical theory of the conventional Differential (theory of gears). The planets of the new Tsiriggakis Differential Mechanism, which are the conic gears that actually transmit motion to the half shafts, follow curves; the form of the curves is determined depending on the vehicles’ nature. The planets of such shape lead the satellites of the new Tsiriggakis Differential Mechanism, which are the smaller conic gears that actually generate the differentiation, to perform three different kinds of motions simultaneously.

This is the reason that makes scientists believe that the new Tsiriggakis Differential Mechanism will definitely be the differential that every vehicle will have in the near future!

3.The new Tsiriggakis Concept

First of all, the satellites are involved into the rotation of the crown and the casing of the differential. Moreover they can rotate around themselves, in other words they rotate around an axis, which is on the geometrical plane of the motion of the crown and the casing of the differential. Furthermore they can reciprocate vertically to the geometrical plane of the motion of the crown and the casing of the differential. The satellites reciprocate together with the axle, on which they are maintained.

The new Tsiriggakis Differential Mechanism has a very slight difference with the conventional differential. This slight difference has been proved to be an evolution in the field of Transmission of Motion. The innovation of the new Tsiriggakis Differential Mechanism is the shape of the planets, which lead the satellites to perform one additional motion, in contrast with the conventional differential, where the satellites perform only two kinds of motions. The new Tsiriggakis Differential Mechanism provides the appropriate differentiation and distributes equal power to all of the motive wheels. This is achieved because the curved planets function as inclined surfaces.

4. Controlling the point where the differentiation is generated

The third additional motion of the satellites is a reciprocating displacement, which is parallel to the axis of their rotation. The reciprocation of the axle, on which the satellites are maintained, can be very easily and efficiently controlled, if it is required to be controlled. With a conventional mechanically or hydraulically or pneumatically or electronically controlled system it is achieved to control the reciprocation of the axis, on which the satellites are maintained. Therefore, the rotation of a satellite around itself, in relation to the other one, can be fully controlled. In other words, the differentiation of the revolutions of the planets, half shafts, and motive wheels can be fully controlled. The intervention to the heart of the differential, where the differentiation is generated, gives the ability to cleverly, efficiently and easily control and manipulate the behavior of the differential and consequently, the behavior of the vehicle.


File Library (videos & animations, photos)

In this section of our Web Page there are photographs, videos and animations that illustrate the operation of Tsiriggakis Controllable Differential.

Video Library

Controllable Differential clips

Three video clips are available. To download, right click on each of the respective image and select save target as...

clip 01
clip 02
clip 03


Photo Library

Controllable Differential photos

Below there are some photographs of the New Tsiriggakis' Differential Mechanism, by clicking on each of them, a more enlightening figure will appear.



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Background: The new Tsiriggakis' Differential Mechanism

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