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Greek inventor of an innovative gearless mechanism that can alter the speed of a rotating shaft and can be used as a gearbox, seeks partner for financial and technical co-operation

Country of Origin: Greece
Reference Number: TOGR20200518001
Publication Date: 18 May 2020


A Greek mechanical engineer has invented a gearless mechanical system consisting of solid parts, which can alter the speed of a rotating shaft. The inventor is interested in finding partners for financial co-operation in order to invest in the patenting of this technology. The client is also interested in the possibility of technical co-operation (for the creation of prototypes).


A Greek inventor has developed a gearless mechanical transmission system made of solid parts. 

It enables the mechanical transmission of power from a shaft that rotates at a certain speed (input shaft), to another one (output shaft) reducing the speed by half, quarter, an eighth, etc., or increasing it by 2, 4, 8, etc.

It is based on the general layout of an Oldham type coupling (assembly 4 in attached images) which connects two parallel but not collinear shafts (parts 5 & 7) transmitting the motion from one to the other at a constant transmission ratio 1:1. These shafts are mounted on bases (parts 6 & 8), and connected via a link shaft (part 9).

For the purposes of the invention (assembly 1) an additional component (part 10) is seated on an additional mounting base element (part 11).

This component (part 10) is a disc with an eccentric bore that is a seat for the link shaft (part 9). Through its external cylindrical surface, the disc rotates on a geometrical axis (z-z') that is on the midpoint of the line that connects the geometrical axes (x-x', y-y') of the shafts (parts 5 & 7). It comes out that when the disc (part 10) is rotating at a certain speed, then the two shafts (parts 5 & 7) are rotating with half that speed.

The previous configuration is the basis for the next ones that use its principle of operation but are more suitable to be used as reducers.

Instead of external mounting bases (parts 6 & 8) of the two shafts (parts 5 & 7) there is a central mounting carrier so as to have the two sides free to be connected to the output and input shafts. All the parts that remain have a through hole in order for a fixed mounting element to pass through it.

In the first configuration (assembly 2), this fixed mounting element (part 15) bears two seats (seats E & F in attached image 7) on its ends that replace the bores of the bases (parts 6 & 8) as mounting points for the two shafts (parts 12 & 13) that now have a central bore for this purpose. The link shaft (part 14) now has also a central hole but this does not come to any contact with the body of the mounting element (part 15) under any circumstances. This configuration allows one shaft (part 12) to be extended on one side so as to be connected to the output shaft (when the device is used as reducer), and the part that in the previous configuration had the form of a disc, now can be extended sideways to form a hollow shaft (part 16) so as to be connected to the input shaft.

The second configuration (assembly 3) is based on the previous one but has no mounting base for the "disc". The "disc" (part 21) is now a hollow shaft that is mounted on the fixed mounting carrier (part 20) itself.

Combinations of single stages can give transmission ratios that are powers of 1/2 or 2. These combinations for both the typical form (assembly 19) and the typical without mounting base form (assembly 22) can have a common central mounting carrier. For systems that are double stage and above, the input and output shafts can be collinear or non collinear depending on the configuration of the central mounting carrier.

The invention has the potential for a variety of applications. For example: reducer for aircraft engines such as geared turbofans, reducer for generators, automotive / maritime industry uses such as gearboxes, camshaft applications, etc.

The inventor is interested in financial co-operation with potential investors who would finance further the patenting of the invention. In addition, the client also wishes to find technical co-operation partners for constructing prototypes and, at a later stage, for commercialization of the technology. See details below.















Advantages and Innovations

The potential advantages of this invention are:-

- The power efficiency can be very high, since cylindrical or needle type friction elements can be used on the surfaces that have relative motion

- The invention has the characteristic that the surfaces that have relative motion can be wide enough, so that the power transmission can take place without too high stress on the materials.

- The contact between the relatively moving surfaces is constant.

- The transmission ratio is a result of the relative geometry between the parts, and is not an output of other parameters such as friction, forces, torques, etc.

- Very high or very low transmission ratios can be applied (by combining stages).

- Since friction can be retained to a minimum, the speed (revolutions per minute) can be increased compared to other possible solutions

- Relatively simple and cheap to manufacture.

- It uses no more than four moving parts per stage, all of which are solid, and of a very simple shape. This is also true for the non-moving parts.

- Lightweight and compact (for its power output).

- Small frontal surface for its power output (compared to other solutions such as planetary gears), even for multistage applications.

- The ratio of the reduction or the increase of the speed is very accurate.

- The output shaft can be co–linear or non-linear (but always parallel) with the input shaft, and version 2 offers the ability to avoid any external mounting.

Stage Of Development

Prototype available for demonstration

Stage Of Development Comment

The third type (with three external mounting bases without a central mounting carrier, as described above) has been constructed, confirming the principle of operation, and is available for demonstration. Regarding the first and second types (and combinations of more than one stage), their operationality has successfully passed the simulation stage.

Requested partner

Two types of partners are sought as follows:-
- financial co-operation in order to invest in the invention and finance the application for patents abroad (including annual patent fees and possible legal expenses). This agreement would also include support for the protection and promotion of the invention.

- technical co-operation (which also has to include full coverage of the costs for the application of the patents for various countries, the first annual fees in relation to them and other related expenses such as legal expenses, etc) for the creation of prototypes that exhibit the characteristics of at least two versions / types of the invention in order to demonstrate the technology to possible end-users. This agreement would also include support for the promotion of the invention.
Once patent applications and related fees issues have been agreed on, the inventor is willing to discuss other aspects of collaboration, such as concession on royalties per technology sector, or entire sale of the intellectual property rights.

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