Crankshaft-free single-machine double-cylinder three-piston type engine
By designing a single-machine twin-cylinder three-piston engine without crankshaft, abandoning the crank connecting rod mechanism, and adopting a one-way piston rotation and radial stroke compensation structure, the problems of large size, high energy consumption and high noise of traditional four-stroke engines are solved, and the effects of small size, light weight, low noise and energy-saving are achieved.
Patent Information
- Application Number
- CN202410026669.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-09
- Publication Date
- 2025-07-11
AI Technical Summary
Traditional four-stroke engines have problems such as large size, high energy consumption, high noise and heavy weight, which cannot be completely overcome.
A single-crank, twin-cylinder three-piston engine with no crankshaft is designed, using parts such as the body, left hood, right hood and circular spokes. Abandon the crank connecting rod mechanism, and the piston only rotates in one-way. Combined with the radial stroke compensation structure of the piston idle operation and the special design of the piston to ensure efficient operation in sealed state.
It achieves the engine's small size, light weight, low noise, stable operation and great energy saving potential, and has the effect of a 12x traditional four-stroke internal combustion engine.
Smart Images

Figure CN120291930A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an engine, and more particularly to a crankless single - cylinder double - piston three - piston engine. Background Art
[0002] In the field of engine technology, currently traditional four - stroke engines dominate. Its technical characteristic is that a single cylinder makes only one power stroke during a 720 - degree rotation; this makes it impossible to completely overcome the disadvantages of large volume, high energy consumption, high noise, and large weight.
[0003] Our crankless single - cylinder double - piston three - piston engine makes 12 power strokes during a 720 - degree rotation, which is 12 times that of a traditional four - stroke internal combustion engine. Therefore, our crankless single - cylinder double - piston three - piston engine may be a new method to replace traditional four - stroke internal combustion engines. Summary of the Invention
[0004] The specific content includes: a crankless single - cylinder double - piston three - piston engine, which consists of a body, a left engine cover, a right engine cover, a circular - structured spoke, and pistons.
[0005] 1. The body is composed of a left body and a right body formed by rotating 180 degrees in a plane with the center point of the body as the axis. On the body, there are machined a spark plug hole, a mixture injection hole, a compressed air injection hole, an open exhaust hole, a fixing hole, and a positioning hole.
[0006] 2. The left engine cover has machined fixing holes and positioning holes corresponding to those on the body. On the engine cover, there is also machined a piston idle - running and radial - stroke compensation structure. This piston idle - running and radial - stroke compensation structure also consists of two parts, and its right half - part is formed by rotating the left half - part 180 degrees in a plane with the center of the body as the axis. This structure can ensure that when the engine is idling, the piston runs in close contact along the curve of the body, ensuring that the crankless single - cylinder double - piston three - piston engine operates efficiently under good sealing conditions.
[0007] 3. The circular - structured spoke has machined piston radial - running grooves; behind the running direction of the piston radial - running grooves, combustion chambers are respectively machined, and a spline shaft hole and a weight - reducing hole are also machined. To reduce running friction, the spoke is in a slightly floating running state axially and radially.
[0008] 4. A piston with an approximately rectangular cross-section, which consists of a piston top, a piston base, a cylindrical compression spring, a left sealing strip, and a right sealing strip, etc. The piston top is characterized in that it is divided into left and right parts, and the two parts are connected by a cylinder and a circular groove. The circular groove is equipped with a spring to ensure the sealing state between the piston and the cylinder heads on both sides. The piston top is composed of a right-angled triangle in the upper part and a rectangle in the lower part, and a circular hole for installing the piston base is machined on the piston top, and a space for installing the cylindrical compression spring is left in the hole. The piston base is characterized in that it is formed by combining a semi-circular lower part and an inverted isosceles triangle upper part; a lubricating oil hole is machined on the piston base.
[0009] The solution of the present invention has the following beneficial effects
[0010] 1. Easy to develop
[0011] The structure of the present invention is very simple. Only several main components such as the engine body, engine cover, wheel spokes, and pistons form a crankshaftless single-engine double-cylinder three-piston engine, and the development work is very simple.
[0012] 2. Stable operation and low noise.
[0013] Because the crankshaftless single-engine double-cylinder three-piston engine abandons the crank connecting rod mechanism and also abandons the reciprocating motion, and the piston only makes a single-directional rotational operation. It runs very smoothly, and it is natural that the noise is low.
[0014] 3. Small volume and low weight.
[0015] Because the solution of our invention has a very simple structure, it is natural that the volume is small and the weight is low.
[0016] 4. Great energy-saving potential.
[0017] The main technical advantage of our project is that it has a much larger S / D ratio (S = piston operating stroke, D = the diameter of converting the cross-sectional area of the cylinder block of the crankshaftless single-engine double-cylinder three-piston engine into a circular area) than traditional internal combustion engines; this provides great energy-saving potential for our project. Description of the drawings
[0018] Figure 1 、Schematic diagram of the engine body.
[0019] Figure 2 、Schematic diagram of the left engine cover.
[0020] Figure 3 、Schematic diagram of the right engine cover.
[0021] Figure 4 、Schematic diagram of the piston
[0022] Figure 5 、Schematic diagram of the wheel spokes.
[0023] Figure 6 Schematic diagram of the intake compression stroke.
[0024] Figure 7 Schematic diagram of planar assembly.
[0025] Figure 8 Attached drawing of the abstract of the specification.
[0026] The numbers in the figure represent the following meanings.
[0027] 1. Body 2. Cross-sectional view of the body 3. Fixed hole 4. Positioning hole
[0028] 5. Spark plug hole, 6. Open exhaust hole, 7. Curve of the right cylinder block
[0029] 8. Curve of the left cylinder block, 9. Piston idling operation, support mechanism at the piston bottom
[0030] 10. Sealing part installation groove, 11. Fuel injection hole, 12. Compressed air injection hole
[0031] 13. Piston running direction, 14. Spoke, 15. Piston radial running groove
[0032] 16. Weight reduction hole, 17. Combustion chamber, 18. Spline shaft hole
[0033] 19. Left machine cover, 20. Right machine cover, 21. Lubrication and cooling oil inlet hole
[0034] 22. Lubrication and cooling oil outlet hole, 23. Right half part of the piston top
[0035] 24. Left half part of the piston top, 25. Piston, 26. Piston bottom.
[0036] The specific implementation manners are described as follows with reference to Figure 7 as follows;
[0037] We assume that the piston 25 is running clockwise in the direction indicated by the arrow 13. The piston 25 is pushed by the high-pressure gas gushing out from the combustion chamber; the moving piston drives the spoke to also move clockwise. And the power is output externally through the spline shaft installed on the spoke. At the same time, the piston on the other side of the cylinder block is also continuously running under the push of the high-temperature and high-pressure gas gushing out from the combustion chamber, running clockwise in the direction indicated by the arrow 13; before the piston running direction, the residual exhaust gas from the previous stroke is being discharged through the open exhaust hole.
Claims
1. A crankshaftless single-engine double-cylinder three-piston engine; it consists of a body, a left engine cover, a right engine cover, a wheel spoke and a piston.
2. The body of the crankshaftless single-engine double-cylinder three-piston engine according to claim 1, characterized in that, The body is composed of two parts, the left and the right; the left half is formed by rotating the right half 180 degrees around the central plane of the body.
3. The left engine cover of the crankshaftless single-engine double-cylinder three-piston engine according to claim 1 is characterized in that, The left engine cover is composed of two parts, the left and the right; the left half is formed by rotating the right half 180 degrees around the central plane of the body. A piston idle running and radial stroke compensation structure is provided on the engine cover, which is also composed of two parts, the right half of which is formed by rotating the left half 180 degrees around the central plane of the body.
4. The right engine cover of the crankshaftless single-engine double-cylinder three-piston engine according to claim 1, characterized in that it is a mirror image structure of the left engine cover.
5. The spoke of the crankshaftless single-engine double-cylinder three-piston engine according to claim 1, characterized in that, Piston radial running grooves and combustion chambers are provided on the wheel spoke.
6. The piston of the crankshaftless single-engine double-cylinder three-piston engine according to claim 1, characterized in that It consists of three parts; the left half of the piston top and the right half of the piston top, and also includes the piston bottom.