Description
Working pressure
By dividing the working pressure (400 bar = 40 MPa) by the modulus of compressibility of the hydraulic oil used (1700 MPa), the resulting quotient of 0.0235 represents the volumetric compression ratio (ΔV/V). This means that, when only 2.3% of the remaining fluid volume is injected (at this point it is 1.53 litres), the working pressure is recovered almost instantaneously. As in all fluid compression processes, heat is generated (First Law of Thermodynamics). However, calculations show that the use of hydraulic oil limits the temperature rise to only 0.71 °C, which makes it possible to consider this process as practically adiabatic reversible.
Operates exclusively with hydraulic fluid
The system consists of nested, concentric and telescopic modular segments. When deployed, these segments form a conical cavity, generating a thrust force. Their main function is to reuse most of the fluid hydraulic cylinder that drives it, this being its defining characteristic. Without this feature, the system would not qualify as an engine, but would resemble a telescopic hydraulic cylinder.
"Creativity, attention to detail and technical know-how are basic elements to develop new ideas".
Rafael Serrano
Alternative Cone Cavity Reciprocating Hydraulic Motor
Main technical characteristics
The simple use of a container uniform whose larger base acts as a piston is sufficient to save two thirds of the hydraulic fluid that moves it compared to a standard cylinder.
Non-combustion operation
zero emissions
✅ Fully hydraulic drive (without thermal cycle)
Hermetically sealed assembly with 1.53 litres of residual oil (no gaseous phase)
Laminar flow
at ultra-high pressure
Reynolds number (Re) <100 at more than 400 bar
Oil compressibility: 2,35% ΔV/V (K=1,700 MPa)
Mechanical advantages
Only 0.56L/cycle (vs. 6.26L standard) -> 9.16 times less fluid
🔹 Geometric design that eliminates cavitation problems
🔹 Specialised sealing mechanism for telescopic motion
Principle of operation
🔹 Intake/Push Phase: Injection of 0.56L fluid at 400 bar (high pressure)
🔹 Return/Reset Phase: 90% Reuse of fluid by crankshaft retraction
Self-sustainable operation
🔹 Accurate pressure self-regulation: maintains 400 bar (±1.5%) automatically
🔹 Radical reduction in energy demand: 90% less pumping requirement vs. conventional hydronic systems
Performance
Unprecedented efficiency
🔹 Quasi-adiabatic efficiency, minimum thermal variation: ΔT <1°C per cycle
🔹 System scalability: adaptable power range: from 1 kW to 2 MW or more
Two-way transmission
Hydraulic -> mechanical -> electrical energy
🔹 Aeronautical Application: In-flight battery charging
🔹 Naval Application: Silent propulsion for submarines/ships
🔹 Enclosed Hydraulic Reaction Motor: 0% mass ejection, internal feedback orbital adjustments with recycled fluid (1.53L), infinite operation and absolute stealth.
EVs
Disruptive system
🔹 Charging on the move while driving
🔹 Grid support: vehicle-to-home (V2H) technology for residences
Dimensions
Example of the dimensions of a 240 kW compared to a utility vehicle
Weight and batteries
About 600 kg including a permanent magnet generator (PMG), but reducing the size of batteries and thus their weight compared to fully electric vehicles or by eliminating the combustion engines and the fuel tank in hybrids.
In any position
This system can be installed in any position: vertical, horizontal or inclined. The generators can be coupled in pairs to the crankshaft by means of a toothed belt to reduce costs, weight and dimensions, thus enabling the use of carbon fibre in their construction while at the same time facilitating their location.
Operational data
This conical-cavity motor operates with only 0.56 litres of volume per cycle and module, requiring only one pump per module. 64.4 kW power. Comparatively, a standard hydraulic cylinder would need :
9.16 times more volume (6.26 litres).
9.16 times more pump power (589.90 kW)
...for the same power delivery (260 mm piston, 118 mm stroke, 400 bar).
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