VESELOVSKY Rotary-Piston Engine
 

http://www.machaon.ru/tetra/veselo.htm

http://www.machaon.ru/tetra/veselo.gif

Fields of application:
Car-building, low-weight internal-combustion drive for agriculture technique, light aviation, shipbuilding.

Description:
It is generally recognized that Wankel-type rotary engines possess a number of essential drawbacks that hinder considerably its practical applications. Namely, Wankel engine inlet and outlet openings are connected for some time that results in efficiency loss of up to 15-30%. This leads also to non-stable work at low rotations and ecologically harmful exhaust.
The proposed construction of Veselovsky rotary-piston engine does not have these disadvantages and at the same time holds its main merits: compactness, simplicity of design, low-weight.
The construction of Veselovsky rotary-piston engine is distinguished principally in several basic design components and operation features which are illustrated by the following table:
Comparison of Wankel and Veselovsky rotary engines:
Parameter WANKEL VESELOVSKY
Form of a working chamber Oval Triangle
Form of a rotor Triangle Elliptical
Type of rotation for rotor and axis One direction.

One rotor rotation falls on three axis rotations
Opposite directions.

One rotor rotation falls on two axis rotations.
Location of sealing blades On the tops of a triangle rotor In the engine stator
The Veselovsky engine is the type of rotary-piston internal combustion engine with the planetary movement of the rotor-piston. It realizes the full four-stroke cycle of a thermodynamic process.
The Veselovsky engine has the improved system of gas-exchange. It is known that gas-exchange openings in both Wankel and conventional engine are located in a fixed stator, i.e. they are relatively distant from either rotor or from piston. In adjac ent zones it results in increased pressure during exhaust and in pressure lowering during inlet. It means that in both cases the process of exhaust escape and fuel inlet runs under less favorable conditions. On the contrary the gas-exchange windows of th e Veselovsky engine are located at the periphery of the elliptical rotary-piston and follow ("track") the zones of pressure changes. Such dynamic location of gas openings allows to obtain the optimal operation features: to have perfect gas exchange, to i ncrease fuel efficiency, to get secure start of a cold engine, to reduce toxicity of exhaust.
The special sealing system has been developed for Veselovsky engine. Its reliability is comparable with a conventional engine and exceeds that of for any type of known rotary engines.
Veselovsky rotary-piston engine is distinguished with the new efficient system of synchronization of stator - rotor - eccentric axis. It is based on the closed planetary tooth gear that provides for absolutely precise synchronization. It excludes totally the undesired displacement in interference gap between rotor and eccentric axis. It eliminates also vibrations and shock loads in a gear unit (as it takes place in Wankel-type engine).


Fig. 1. A diagram of Veselovsky rotary-piston engine.

The engine composed from the following main components (see Fig.1):
1 - stator with the three-element working chamber (5) representing an equilateral triangle;
2 - eccentric axis (providing for two rotations in one period of rotor-piston);
3 - elliptical rotor-piston which is eye-jointed to the eccentric axis (2);
4, 5, 6 - working chambers;
7 - candle;
8 - double spring-backed sealing elements;
18, 19 - gas exchange system;
11 - synchronizing gear unit providing for kinematics connection between stator, rotor-piston and eccentric axis and special side sealing elements which are not shown;
The design allows to create a multi-unit engines with power up to 300-400kW.

Advantages:
Veselovsky rotary piston engines offers the following advantages over Wankel rotary motor:

* Principally new kinematics scheme which provides for precise synchronization of stator-rotor-eccentric axis;
* Safe system of inlet and exhaust gas exchange which allows to have ecologically clean exhaust.
* New system of sealing blades positioned on a stator. The sealing provides for effective gas exchange and has reliability as that of reciprocating motor.
* Veselovsky design can function in regimes of both hydraulic pump and hydraulic motor what is not attainable for Wankel engine.
* Veselovsky engine is characterized with high fabricability, it does not require either expensive materials or special equipment and particular technological processes.

Stage of Development:
The working capacity of Veselovsky design has been verified by the example of rotor юpiston hydraulic machine that possesses the same kinematics scheme and works in both regimes: as hydraulic pump and hydraulic motor (what is not true for Wankel-type eng ine).
The basic elements of Veselovsky engine are applied for international patenting.

seems like the compustion would be low,

But you would have a egg crest :(

not true with the renesis- overlap has been removed.

The more I learn about the rotary engine, the more I hope someone (Mazda I hope) can really advance it more than has happened to this point. The Renesis is a great evolution of the rotary engine (I’m a rotary newbie so forgive me if the change was more of an upgrade than a evolution), but I wish a complete revolution would take place. I really have grown to love the little rotary and while it still has significant drawbacks I can’t stop myself from smiling knowing it’s under the hood of my 8.

Of course they don't list the disadvantages of their engine such as needing an intake and exhaust ports located on the moving rotors as well as having spark plugs on 3 separate sides. The big disadvantage they state the wankel has is port overlap which as Zoom44 has already pointed out is no longer true. It's a neat concept but if it were a viable option, I'm sure someone would be using it. So many people come out with different forms of rotary engines and claim them to be superior yet no one ever builds them and even tests them in a car to determine practicality. In the past decade, the wankel has come along farther than it had in it's entire previous history. I'm still a fan of my "triangle in a peanut".