SYstems for COnversion of MOtions and REnewable ENergies
 Frequently asked questions 
Soupape Anti Erosion à Rotations Epicycloïdales / Anti Friction Epicyclic Rotary Valve

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21/09/2015 : Is the SAERE Patent delivered ? Who is interested by it and what are its perspectives ?
21/03/2010 : Why does SAERE achieve a variable valve timing with an epicyclic gearing ?
15/11/2009 : What is the SAERE’s implementation on conventional engines with cylinders ?
11/10/2009 : What is variable valves' timing and what about SAERE ?


Initially deposited in August 2009, 19th, the SAERE Patent has been delivered in june 2015 after about 6 years of process by the Institut National de la Propriété Industrielle (INPI).

The search report by the INPI on this new technology is empty for any antecedence which could be judged relevant :

Thus, the Soupape Anti-Erosion à Rotations Epicycloïdales
[Anti Friction Epicyclic Rotary Valve] is confirmed

as an innovating technical proposal which is recognized by the INPI
in the field of the variable valve timing mechanisms.

Moreover, SAERE names and principles have been widely published on internet and it are expandable through the rules of Intellectual property in all the signatory countries of the Bern Convention.

SAERE preferentially interests the experts and users of internal combustion engines
who are wishing to increase their yield
and/or their power.

SAERE does not call for very deep changes of the contemporary machines with pistons,
but simply and adaptation of the breech and an electronic control
 of the rotation of the regulating shaft(REG) on each SAERE valve.

Nevertheless, other more specific uses can be foreseen.
SAERE is useful in any machine with fluids in intermittent out-flow which are requiring complex controls of their circulation.

It is foreseeable to deposit worldwide additional patents to describe improvements for SAERE by the future investors and/or companies which wish to open out a monopole of industrial property about this strong breakthrough for the breath of machines.


The variable valve timing (VVT) is crucial to adapt the breath of an engine in relation with its mechanical load and its circulation of fluid. Although a lot of systems have already been shown, SAERE is the first VVT mechanism which needs only one regulating shaft (REG) to get a timing in phase AND in lift of the valves.

From a mechanical point of view, the epicyclic gearings are robust with very few rubbings and widely used to transmit power, notably for some transmissions and gearboxes.

From a kinematic point of view, an epicyclic gearing is a bi-mobile mechanism with rolling without slipping
(often with gearings) : it uses 2 mechanical rotary entries to control its only one mechanical rotary exit.

The Anti Friction Epicyclic
Rotary Valve (SAERE) artfully takes these characteristics :
- one primary rotary entry (PRI) coming from the engine is actuating the SAERE valve in a rotary motion,
- the rotary exit of SAERE is the obturator (OBT) which periodically opens and closes the pipes of the chamber,
- the regulating entry (REG) which is piloted with electronics can stay stationary or be displaced with a given angle (timing in phase), or be piloted in speed (timing of the obturator to get variable flowing area for the fluid)

To illustrate, here are 2 animated drawings by having given the followings roles to the elements of a typical epicyclic gearing :
- the planetary(PLA,black) as the regulating entry (REG),
- the crown(COU,blue) as the primary entry (PRI)
- and the satellites' carrier (PST) as the exit which is bound to the oburator (OBT, red)

Example 1 : the rotary valve's timing is variable for the advance/delay (in phase)

advance and delay of the SAERE valve in red by rotating the regulating gear in black
advance and delay of the SAERE valve in red by rotating the regulating gear in black
(primary shaft (PRI) in blue is static here to better understand, but in fact it is rotating at a nearly constant speed according to the RPM)

Example 2 : the rotary valve's timing is variable for the flowing area (in lift)

The control in velocity of (REG) can quickly block the SAERE 's obturator at any time and in any position.
With the control in velocity of (REG,black), SAERE can block the obturator(red) at any time and in any position.
 (completely or partially opened or closed).

These 2 examples don't restrict the possibilities of the SAERE's variable valve timing which are nearly infinite.
A full technical  file about the valves and an educational video of SAERE are available too.


Here is the proposition of Sycomoreen, typical but of course, other adaptations / improvements are foreseeable :

Summarized poster of the SAERE technology in the case of volumetric machines with cylinders

Links for MPRBC and POGDC engines of SYCOMOREEN


The valves :

In machines where fluids are flowing, some of them have chosen an intermittent out-flow, what requires the periodic opening and closing of valves. The valves are parts which block temporarily the way for the fluid, and the technological choices, although they are various, can be classified in 3 main categories :

1. The "poppet valves" with stem and tulip (the most widespread), generally actuated by a camshaft, with or without intermediate kinematics between the cam and the valve.

2. The rotary valves, generally moved by gearings or strap/chain.

3. Simple hole opened and closed by the motion of main moving parts for the machine, like a piston or its sheath, which starts to oscillate.

The Variable Valves' Timing,
It is also known as VVT ; it gathers the set of the strategies :
a) to modify the instants of opening and closing for a valve (timing called  "in phase")
b) to regulate the surface allocated for the out-flow of fluid (timing called "in lift" or "in opening")

The variable valve timing is preferably used for valves of type 1 or 2. It is about advance or delay the opening/closing of the valve, and possibly its area of opening, according to the conditions where the engines works : mainly its speed (RPM) and its load (wanted torque on the motor shaft)

During the XXth century, the variable valve timing has been especially developed for internal combustion engines, among 2 complementary ways :
- design and manufacturing of mechanisms to allow these managements,
- experimental research about the best laws of valves' control to reduce the consumptions of fuel and/or increase the power of the engine.

What about SAERE ?
SAERE, the French "Soupape Anti-Erosion à Rotations Epicycloïdales", or the anti-friction epicyclic rotary valve, belongs to the rotary valves' family and offers a variable valves' timing in phase and lift, thanks to an epicyclic approach.

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SYstems for COnversion of MOtions and REnewable ENergies
 Frequently asked questions 
Soupape Anti Erosion à Rotations Epicycloïdales / Anti Friction Epicyclic Rotary Valve