Double-piston engine

Abstract

The invention relates to the technical field of piston engines, in particular to a double-piston engine which comprises an air cylinder. Telescopic piston bodies which are symmetrically distributed left and right are installed on the inner wall of the air cylinder through first piston rings, a combustion chamber is arranged in the middle of the interior of the air cylinder, the M-shaped connecting rods are fixedly connected to the ends of the two piston bodies, and the inner ring gears which do reciprocating motion in the longitudinal direction are arranged in the M-shaped connecting rods. A transmission gear is connected to the inner side of the inner ring gear in a meshed mode and transmits power through a transmission shaft. The double-piston design is adopted, the two piston bodies work together for bearing, the area for absorbing kinetic energy generated by combustion gas is increased, kinetic energy conversion is more complete, the heat efficiency of the engine is improved, linear kinetic energy of the piston bodies directly acts on the tangent line of the transmission gear through the M-shaped connecting rod and the inner ring gear, loss-free conversion is formed, and the service life of the engine is prolonged. The heat efficiency, the conversion efficiency and the output power are improved, and meanwhile vibration of the engine is remarkably reduced.

Description

[0001] The present invention relates to the technical field of piston engines, in particular to a dual-piston engine. Background Art

[0002] The piston engine generates high-temperature and high-pressure gas by burning fuel, which pushes the piston up and down in the cylinder, and then drives the crankshaft to rotate through the connecting rod to output power. The piston plays a role in the three auxiliary strokes of intake, compression and exhaust, and is driven by the connecting rod to complete the corresponding work. It is widely used in automobiles, motorcycles, ships, generator sets and other fields.

[0003] A piston engine is mainly composed of a cylinder, a piston, a connecting rod, a crankshaft, a valve mechanism, a propeller reducer, a casing, etc. The cylinder is where the mixture (combustible gas) is burned. The piston is contained in the cylinder for reciprocating motion, and this motion is converted into the rotational motion of the crankshaft through the connecting rod. The connecting rod is used to connect the piston and the crankshaft. The crankshaft is the component that generates the engine power output. However, the traditional piston engine has the following problems: (1) Only the part of the expansion force (kinetic energy) generated when the mixture burns that is absorbed by the piston does useful work, and the rest acts on the cylinder head and cylinder to do useless work, resulting in low thermal efficiency. (2) The transmission structure of the connecting rod and the crankshaft causes losses because the direction of the connecting rod force is not in a straight line with the direction of the crankshaft rotation.

[0004] Therefore, in order to address the above-mentioned problems of low working efficiency and thermal efficiency of traditional piston engines, a dual-piston engine can be designed. Summary of the invention

[0005] In order to overcome the problems of low working efficiency and thermal efficiency of traditional piston engines.

[0006] The technical scheme of the present invention is: a double-piston engine, comprising a cylinder; an inner ring gear and an M-type connecting rod, a retractable piston body symmetrically distributed on the inner wall of the cylinder is installed through a first piston ring, a combustion chamber is arranged in the middle of the cylinder, two piston body ends are fixedly connected with M-type connecting rods, an inner ring gear reciprocating in the longitudinal direction is arranged in the M-type connecting rod, a transmission gear is meshed and connected to the inner side of the inner ring gear, the radius of the transmission gear is half of the sum of the inner width and the tooth height of the inner ring gear, and the ratio of the number of teeth of the transmission gear to that of the inner ring gear is 1:2 ， The transmission gear transmits power through the transmission shaft.

[0007] Preferably, it includes four strokes: intake, compression, power, and exhaust. When no work is done, the rotation of the transmission shaft and the transmission gear drives the piston body to reciprocate in the cylinder through the inner ring gear and the M-type connecting rod to complete the intake, compression, and exhaust strokes. The piston body reciprocates once, the M-type connecting rod and the inner ring gear also reciprocate once, and the transmission gear and the transmission shaft rotate one circle. When working, the mixed gas in the cylinder burns to generate power, pushing the two piston bodies to move in opposite directions. The M-type connecting rod pulls the inner ring gear to drive the transmission gear and the transmission shaft to rotate and output power. The cylinder works once and works half a circle on the four transmission gears at the same time.

[0008] Preferably, the transmission gears and the inner ring gears form a group of two, corresponding one to the piston body and the M-type connecting rod.

[0009] Preferably, a transmission shaft is provided on each side of the cylinder, and two transmission gears are provided on each transmission shaft, corresponding to an inner ring gear and an M-shaped connecting rod respectively. On the same transmission shaft, the two inner ring gears respectively mesh with two transmission gears, and the meshing directions are opposite, and the movement directions of the inner ring gears are opposite.

[0010] Preferably, a gas channel tube is installed inside the piston body through a gas channel piston ring.

[0011] Preferably, a gas channel inner protrusion is provided on the inner side of one end of the gas channel tube close to the piston body.

[0012] Preferably, the bottom inner part of the piston body is fixedly connected to a control tube via a fixed bearing, and the outer wall of the control tube has a groove; the groove fits with the protrusion in the gas channel.

[0013] Preferably, the control tube is a hollow tube with four grooves connected end to end in a V-shape, each groove obliquely spans 1 / 4 of the outer wall of the control tube, and the vertical length between adjacent groove valleys is the stroke of the piston body; a control tube bottom protrusion is provided at the bottom of the control tube, which is movably connected to the valve.

[0014] Preferably, valves are installed at the bottom of the two piston bodies, one valve is used for air intake and the other valve is used for exhaust. The closing of the valves is controlled by a spring. The valves are provided with valve protrusions, which occupy 1 / 4 of the valve plane.

[0015] Preferably, a positioning body that rotates synchronously with the transmission gear is installed on the outside of the transmission gear, and a positioning frame is movably connected to the outside of the positioning body, and the positioning frame is also movably connected to the inner ring gear. One positioning frame is correspondingly movably connected to one positioning body and one inner ring gear.

[0016] Preferably, the positioning body is a sector, the arc center of the sector is the center of the transmission gear, the arc radius of the sector is half of the sum of the inner width of the positioning frame and the tooth height of the transmission gear, and the straight-line distance between the widest parts of the sector is the inner width of the positioning frame.

[0017] The beneficial effects of the present invention are as follows: a double-piston design is adopted, and the kinetic energy generated by the combustion of the mixed gas is absorbed by the two piston bodies to generate linear kinetic energy. The two piston bodies jointly bear the work, which increases the area for absorbing the kinetic energy generated by the combustion gas, making the kinetic energy conversion more complete, reducing energy loss, and improving the thermal efficiency of the engine. It has the advantage of high thermal efficiency, and the linear kinetic energy of the piston body directly acts on the tangent of the transmission gear through the M-type connecting rod and the inner ring gear, forming a lossless conversion, so that the conversion efficiency between linear kinetic energy and circular kinetic energy is high, the cylinder works once and works four and a half turns on the transmission gear, the output power of the engine is high, while improving the thermal efficiency, conversion efficiency and output power, the vibration of the engine is also significantly reduced, because the external kinetic energy (action force and reaction force) generated by the combustion of the mixed gas is absorbed by the two pistons and the cylinder, and no power is generated externally. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the structure of a dual-piston engine of the present invention; Figure 2 The diagram shows the transmission structure of the dual-piston engine of the present invention, wherein (A) is a schematic diagram of the installation structure of the transmission shaft, transmission gear, positioning body and positioning frame, and (B) is a schematic diagram of the installation structure of the cylinder, gas channel tube, piston body and control tube; Figure 3 The diagram shows the connection structure of the M-type connecting rod and the piston body in the dual-piston engine of the present invention, wherein (A) is a cross-sectional structure diagram of the cylinder, the M-type connecting rod and the piston body, and (B) is a schematic diagram of the installation structure of the cylinder and the piston body; Figure 4 The diagram shows the connection structure of the positioning body and the positioning frame in the dual-piston engine of the present invention, wherein (A) is a schematic diagram of the inner ring gear, the positioning body and the positioning frame structure, (B) is a schematic diagram of the positioning body structure, (C) is a schematic diagram of the positioning frame structure, and (D) is a schematic diagram of the transmission gear, the inner ring gear, the positioning body and the positioning frame structure; Figure 5 The diagram shows the connection structure of the M-type connecting rod and the inner ring gear in the dual-piston engine of the present invention, e, the inner width of the inner ring gear (6); Figure 6 The diagram shows a schematic diagram of the gas switch control in the dual-piston engine of the present invention, wherein (A) is a schematic diagram of the valve protrusion structure, (B) is a schematic diagram of the valve open state, (C) is a schematic diagram of the valve closed state, (D) is a schematic diagram of the control tube structure, and (E) is a schematic diagram of the V-shaped groove structure on the control tube; Figure 7 Shown is a schematic diagram of the installation structure of the M-type connecting rod, inner ring gear and transmission shaft in the dual-piston engine of the present invention.

[0019] Explanation of the reference numerals: 1. gas channel piston ring; 2. first piston ring; 3. cylinder; 4. transmission gear; 5. combustion chamber; 6. inner ring gear; 7. protrusion in the gas channel; 8. M-type connecting rod; 9. gas channel tube; 10. piston body; 11. valve; 12. positioning body; 13. positioning frame; 14. fixed bearing; 15. control tube; 16. transmission shaft; 17. protrusion at the bottom of the control tube; 18. valve protrusion; a. straight-line distance between the widest parts of the fan-shaped positioning body (12); b. radius of the fan-shaped arc of the positioning body (12); c. inner width of the positioning frame (13); d. vertical length between the valleys of the connected grooves; e. inner width of the inner ring gear (6). DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0021] The present invention provides an embodiment: Figures 1 to 7 As shown, the double-piston engine includes a cylinder 3; an inner ring gear 6 and an M-type connecting rod 8. A retractable and left-right symmetrically distributed piston body 10 is installed on the inner wall of the cylinder 3 through a first piston ring 2. A combustion chamber 5 is arranged in the middle of the cylinder 3. The ends of the two piston bodies 10 are fixedly connected with the M-type connecting rod 8. The M-type connecting rod 8 is provided with an inner ring gear 6 that reciprocates in the longitudinal direction. The inner side of the inner ring gear 6 is meshed with a transmission gear 4. The radius of the transmission gear 4 is the sum of the inner width and the tooth height of the inner ring gear 6. The ratio of the number of teeth of the transmission gear 4 and the inner ring gear 6 is 1:2. The transmission gears 4 and the inner ring gears 6 form a group of 2, which correspond to the piston body 10 and the M-type connecting rod 8 one by one. A transmission shaft 16 is provided on each side of the cylinder 3. Two transmission gears 4 are provided on each transmission shaft 16, which correspond to an inner ring gear 6 and the M-type connecting rod 8 respectively. On the same transmission shaft 16, the two inner ring gears 6 respectively mesh with the two transmission gears 4 in opposite meshing directions, and the movement directions of the inner ring gears 6 are opposite.

[0022] When working, it includes four strokes: intake, compression, power, and exhaust. When not working, the rotation of the transmission shaft 16 and the transmission gear 4 drives the piston body 10 to reciprocate in the cylinder 3 through the inner ring gear 6 and the M-type connecting rod 8 to complete the intake, compression, and exhaust strokes. The piston body 10 reciprocates once, the M-type connecting rod 8 and the inner ring gear 6 also reciprocate once, and the transmission gear 4 and the transmission shaft 16 rotate one circle. When working, the mixed gas in the cylinder 3 burns to generate power, pushing the two piston bodies 10 to move in opposite directions. The M-shaped connecting rod 8 pulls the inner ring gear 6 to drive the transmission gear 4 and the transmission shaft 16 to rotate and output power. The cylinder 3 works once and works half a circle on the four transmission gears 6 at the same time.

[0023] Worth mentioning: Figure 2 The diagram shows the transmission structure of the dual-piston engine of the present invention, wherein (A) is a schematic diagram of the installation structure of the transmission shaft, transmission gear, positioning body and positioning frame, and (B) is a schematic diagram of the installation structure of the cylinder, gas channel tube, piston body and control tube; Figure 3 The diagram shows the connection structure of the M-type connecting rod and the piston body in the dual-piston engine of the present invention, wherein (A) is a cross-sectional structure diagram of the cylinder, the M-type connecting rod and the piston body, and (B) is a schematic diagram of the installation structure of the cylinder and the piston body; Figure 4 The diagram shows a schematic diagram of the connection structure of the positioning body and the positioning frame in the dual-piston engine of the present invention, wherein (A) is a schematic diagram of the inner ring gear, the positioning body and the positioning frame structure, (B) is a schematic diagram of the positioning body structure, (C) is a schematic diagram of the positioning frame structure, and (D) is a schematic diagram of the transmission gear, the inner ring gear, the positioning body and the positioning frame structure; a, the straight-line distance between the widest parts of the fan-shaped positioning body (12); b, the radius of the fan-shaped arc of the positioning body (12); c, the inner width of the positioning frame (13); Figure 5 The diagram shows the connection structure of the M-type connecting rod and the inner ring gear in the dual-piston engine of the present invention, e, the inner width of the inner ring gear (6); Figure 6 Shown is a schematic diagram of the gas switch control in the dual-piston engine of the present invention, wherein (A) is a schematic diagram of the valve protrusion structure, (B) is a schematic diagram of the valve open state, (C) is a schematic diagram of the valve closed state, (D) is a schematic diagram of the control tube structure, (E) is a schematic diagram of the V-shaped groove structure on the control tube; d, the vertical length between the valleys of the connected grooves. Example 2

[0024] The present invention provides an embodiment: Figures 1 to 7As shown, the double-piston engine includes a cylinder 3; it also includes an inner ring gear 6 and an M-type connecting rod 8. A retractable and left-right symmetrically distributed piston body 10 is installed on the inner wall of the cylinder 3 through a first piston ring 2. A combustion chamber 5 is arranged in the middle of the cylinder 3. The ends of the two piston bodies 10 are fixedly connected with M-type connecting rods 8. An inner ring gear 6 that reciprocates along the longitudinal direction is arranged in the M-type connecting rod 8. A transmission gear 4 is meshed and connected to the inner side of the inner ring gear 6. The radius of the transmission gear 4 is half of the sum of the inner width and the tooth height of the inner ring gear 6. The ratio of the number of teeth of the transmission gear 4 and the inner ring gear 6 is 1:2. The transmission gear 4 and the inner ring gear 6 form a group of 2 and correspond to the piston body 10 and the M-type connecting rod 8 one by one. A transmission shaft 16 is arranged on each side of the cylinder 3. Two transmission gears 4 are arranged on each transmission shaft 16, respectively corresponding to one inner ring gear Wheel 6 and M-type connecting rod 8 are on the same transmission shaft 16. Two inner ring gears 6 are respectively meshed with two transmission gears 4 in opposite meshing directions. The movement directions of the inner ring gears 6 are opposite. A gas channel tube 9 is installed on the inner side of the piston body 10 through the gas channel piston ring 1. A gas channel inner protrusion 7 is arranged on the inner side of one end of the gas channel tube 9 close to the piston body 10. A control tube 15 is fixedly connected to the inner bottom of the piston body 10 through a fixed bearing 14. The outer wall of the control tube 15 is provided with a groove, and the groove fits with the gas channel inner protrusion 7. The control tube 15 is a hollow tube. Four grooves are arranged. The grooves are connected end to end in a V shape. Each groove obliquely spans 1 / 4 of the outer wall of the control tube 15. The vertical length between the valleys of adjacent grooves is the stroke of the piston body 10. A control tube bottom protrusion 17 is arranged at the bottom of the control tube 15, which is movably connected to the valve 11. A valve 11 is installed at the bottom of the two piston bodies 10, one valve 11 is used for intake and the other valve 11 is used for exhaust. The closing of the valve 11 is controlled by a spring. A valve protrusion 18 is provided on the valve 11, and the valve protrusion 18 occupies 1 / 4 of the plane of the valve 11.

[0025] When working, it includes four strokes: intake, compression, power and exhaust. When not working, the rotation of the transmission shaft 16 and the transmission gear 4 drives the piston body 10 to reciprocate in the cylinder 3 through the inner ring gear 6 and the M-type connecting rod 8. The inner ring gear 6 reciprocates in the positioning frame 13. The positioning frame 13 reciprocates in a direction at right angles to the movement direction of the inner ring gear 6, and at the same time drives the inner ring gear 6 to move together to complete the intake, compression and exhaust strokes. The piston body 10 reciprocates once, the M-type connecting rod 8 and the inner ring gear 6 also reciprocate once, and the transmission gear 4 and the transmission shaft 16 rotate one circle.

[0026] When working, the mixed gas in the cylinder 3 burns to generate power, pushing the two piston bodies 10 to move in opposite directions. The M-shaped connecting rod 8 pulls the inner ring gear 6 to drive the transmission gear 4 and the transmission shaft 16 to rotate and output power. When the piston body 10 moves, it also reciprocates with the gas channel tube 9. The cylinder 3 works once and works half a circle on the four transmission gears 6 at the same time.

[0027] There is a valve 11 at the bottom of each of the two piston bodies 10, one of which is used for intake and the other is used for exhaust. The closing of the valve 11 is controlled by a spring and the opening is controlled by a control tube 15. When the piston body 10 reciprocates, it drives the control tube 15 to reciprocate in the gas channel tube 9. Due to the effect of the protrusion in the gas channel tube 9, the control tube 15 forms a circular motion. When the protrusion 17 at the bottom of the control tube moves to the valve protrusion 18, the valve 11 is opened. The control tube 15 rotates half a circle when the piston body 10 reciprocates once. Example 3

[0028] The present invention provides an embodiment: Figures 1 to 7 As shown, a double-piston engine includes a cylinder 3; an inner ring gear 6 and an M-type connecting rod 8. A retractable piston body 10 is installed on the inner wall of the cylinder 3 through a first piston ring 2 and is symmetrically distributed on the left and right. A combustion chamber 5 is arranged in the middle of the cylinder 3. The ends of the two piston bodies 10 are fixedly connected with the M-type connecting rod 8. The M-type connecting rod 8 is provided with an inner ring gear 6 that reciprocates in the longitudinal direction. The inner side of the inner ring gear 6 is meshed with a transmission gear 4. The radius of the transmission gear 4 is half of the sum of the inner width and the tooth height of the inner ring gear 6. The ratio of the number of teeth of the transmission gear 4 to that of the inner ring gear 6 is 1:2. 4 and inner ring gear 6 are grouped in pairs and correspond to piston body 10 and M-type connecting rod 8 one by one. A transmission shaft 16 is provided on each side of cylinder 3. Two transmission gears 4 are provided on each transmission shaft 16, corresponding to one inner ring gear 6 and M-type connecting rod 8 respectively. On the same transmission shaft 16, two inner ring gears 6 respectively mesh with two transmission gears 4, and the meshing directions are opposite. The movement directions of the inner ring gears 6 are opposite. A positioning body 12 that rotates synchronously with the transmission gear 4 is installed on the outer side of the transmission gear 4. A positioning frame 13 is movably connected to the outer side of the positioning body 12. The positioning frame 13 is also movably connected to the inner ring gear 6. One positioning frame 13 is movably connected to one positioning body 12 and one inner ring gear 6. The positioning body 12 is a sector-shaped body, the arc center of the sector-shaped body is the circle center of the transmission gear 4, the arc radius of the sector-shaped body is half of the sum of the inner width of the positioning frame 13 and the tooth height of the transmission gear 4, and the straight-line distance between the widest parts of the sector-shaped body is the inner width of the positioning frame 13.

[0029] When working, it includes four strokes: intake, compression, power, and exhaust. When not working, the rotation of the transmission shaft 16 and the transmission gear 4 drives the piston body 10 to reciprocate in the cylinder 3 through the inner ring gear 6 and the M-type connecting rod 8. The inner ring gear 6 reciprocates in the positioning frame 13. The positioning frame 13 is controlled by the positioning body 12 to drive the inner ring gear 6 to reciprocate in a direction that is perpendicular to the movement direction of the M-type connecting rod 8. The positioning body 12 is a sector-shaped body that rotates synchronously with the transmission gear 4 and controls the inner ring gear 6 and the transmission gear 4 to always mesh together with the positioning frame 13. The piston body 10 reciprocates once, the M-type connecting rod 8 and the inner ring gear 6 also reciprocate once, and the inner ring gear 6 is controlled by the positioning frame 13 to reciprocate once in the vertical direction of the movement of the M-type connecting rod 8, and the transmission gear 4 and the transmission shaft 16 rotate one circle.

[0030] When working, the mixed gas in the cylinder 3 burns to generate power, pushing the two piston bodies 10 to move in opposite directions. The M-shaped connecting rod 8 pulls the inner ring gear 6 to drive the transmission gear 4 and the transmission shaft 16 to rotate and output power. The cylinder 3 works once and works half a circle on the four transmission gears 6 at the same time. Example 4

[0031] The present invention provides an embodiment: Figures 1 to 7As shown, a double-piston engine includes a cylinder 3; an inner ring gear 6 and an M-type connecting rod 8. A retractable piston body 10 is installed on the inner wall of the cylinder 3 through a first piston ring 2. A combustion chamber 5 is provided in the middle of the cylinder 3. The ends of the two piston bodies 10 are fixedly connected with the M-type connecting rod 8. The M-type connecting rod 8 is provided with an inner ring gear 6 that reciprocates along the longitudinal direction. The inner side of the inner ring gear 6 is meshed with a transmission gear 4. The radius of the transmission gear 4 is half of the sum of the inner width and the tooth height of the inner ring gear 6. The ratio of the number of teeth of the transmission gear 4 and the inner ring gear 6 is 1:2. The transmission gear 4 and the inner ring gear 6 form a group of 2 and correspond to the piston body 10 and the M-type connecting rod 8 one by one. A transmission shaft 16 is provided on each side of the cylinder 3. Each transmission shaft 16 is provided with There are two transmission gears 4, corresponding to an inner ring gear 6 and an M-type connecting rod 8 respectively. On the same transmission shaft 16, the two inner ring gears 6 mesh with the two transmission gears 4 respectively, and the meshing directions are opposite. The movement directions of the inner ring gears 6 are opposite. A gas channel tube 9 is installed on the inner side of the piston body 10 through the gas channel piston ring 1. A gas channel inner protrusion 7 is arranged on the inner side of one end of the gas channel tube 9 close to the piston body 10. A control tube 15 is fixedly connected to the inner bottom of the piston body 10 through a fixed bearing 14. Four grooves are arranged, and the grooves are connected end to end in a V shape. Each groove obliquely spans 1 / 4 of the outer wall of the control tube 15. The vertical length between the valleys of adjacent grooves is the stroke of the piston body 10. A control tube bottom protrusion 17 is arranged at the bottom of the control tube 15, which is movably connected to the valve 11. The bottom of the two piston bodies 10 are both equipped with valves 11, one of which is used for air intake and the other is used for exhaust. The closing of the valves 11 is controlled by a spring. The valves 11 are provided with valve protrusions 18, which occupy 1 / 4 of the plane of the valves 11. The outer side of the transmission gear 4 is equipped with a positioning body 12 that rotates synchronously with the transmission gear 4. The outer side of the positioning body 12 is movably connected with a positioning frame 13, and the positioning frame 13 is also movably connected to the inner ring gear 6. One positioning frame 13 is movably connected to one positioning body 12 and one inner ring gear 6. The positioning body 12 is a sector-shaped body, the arc center of the sector-shaped body is the center of the circle of the transmission gear 4, the arc radius of the sector-shaped body is half of the sum of the inner width of the positioning frame 13 and the tooth height of the transmission gear 4, and the straight-line distance between the widest parts of the sector-shaped body is the inner width of the positioning frame 13.

[0032] When working, it includes four strokes: intake, compression, power and exhaust. When not working, the rotation of the transmission shaft 16 and the transmission gear 4 drives the piston body 10 to reciprocate in the cylinder 3 through the inner ring gear 6 and the M-type connecting rod 8. The inner ring gear 6 reciprocates in the positioning frame 13. The positioning frame 13 is controlled by the positioning body 12 to drive the inner ring gear 6 to reciprocate in a direction at right angles to the movement direction of the M-type connecting rod 8. The positioning body 12 is a fan-shaped body, which rotates synchronously with the transmission gear 4 and controls the inner ring gear 6 and the transmission gear 4 to always mesh together with the positioning frame 13. The piston body 10 reciprocates once, and the M-type connecting rod 8 and the inner ring gear 6 also reciprocate once. The inner ring gear 6 is controlled by the positioning frame 13 to reciprocate once in the vertical direction of the movement of the M-type connecting rod 8, and the transmission gear 4 and the transmission shaft 16 rotate one circle; When working, the mixed gas in the cylinder 3 burns to generate power, pushing the two piston bodies 10 to move in opposite directions. The M-shaped connecting rod 8 pulls the inner ring gear 6 to drive the transmission gear 4 and the transmission shaft 16 to rotate and output power. When the piston body 10 moves, it also reciprocates with the gas channel tube 9. The cylinder 3 works once and works half a circle on the four transmission gears 6 at the same time.

[0033] There is a valve 11 at the bottom of each piston body 10, which is responsible for air intake and exhaust respectively. The closing of the valve 11 is controlled by a spring, and the opening is controlled by a control tube 15. When the piston body 10 makes a reciprocating motion, it drives the control tube 15 to make a reciprocating motion in the gas channel tube 9. Due to the effect of the protrusion 7 in the gas channel tube 9, the control tube 15 forms a circular motion. When the protrusion 17 at the bottom of the control tube moves to the valve protrusion 18, the valve 11 is opened. The control tube 15 rotates half a circle when the piston body 10 makes a reciprocating motion.

[0034] Through the above steps, a double-piston design is adopted, and the two piston bodies 10 work together, so that the kinetic energy conversion is more complete, and the thermal efficiency of the engine is improved. The linear kinetic energy of the piston body 10 always acts on the tangent of the transmission gear 4 through the M-type connecting rod 8 and the inner ring gear 6, forming a lossless conversion, so that the conversion efficiency of linear kinetic energy and circular kinetic energy is high, and the output power of the engine is high, because the external kinetic energy (action force and reaction force) generated by the combustion of the mixed gas is absorbed by the two pistons and the cylinder, and no power is generated externally, which also significantly reduces the vibration of the engine.

[0035] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A twin-piston engine comprising a cylinder (3); characterized in that: The invention also comprises an inner ring gear (6) and an M-type connecting rod (8). A retractable piston body (10) which is symmetrically distributed on the left and right is installed on the inner wall of the cylinder (3) through a first piston ring (2). A combustion chamber (5) is arranged in the middle of the cylinder (3). The ends of the two piston bodies (10) are fixedly connected to the M-type connecting rod (8). An inner ring gear (6) which reciprocates in the longitudinal direction is arranged in the M-type connecting rod (8). A transmission gear (4) is meshedly connected to the inner side of the inner ring gear (6). The radius of the transmission gear (4) is half of the sum of the inner width and the tooth height of the inner ring gear (6). The ratio of the number of teeth of the transmission gear (4) to that of the inner ring gear (6) is 1:

2. The transmission gear (4) transmits power through a transmission shaft (16).

2. The dual-piston engine according to claim 1, characterized in that: Every two transmission gears (4) and inner ring gears (6) form a set, and correspond one to one with the piston body (10) and the M-type connecting rod (8).

3. The dual-piston engine according to claim 1, characterized in that: A transmission shaft (16) is provided on each side of the cylinder (3), and two transmission gears (4) are provided on each transmission shaft (16), respectively corresponding to an inner ring gear (6) and an M-shaped connecting rod (8). On the same transmission shaft (16), the two inner ring gears (6) respectively mesh with the two transmission gears (4), and the meshing directions are opposite, and the movement directions of the inner ring gears (6) are opposite.

4. The dual-piston engine according to claim 1, characterized in that: A gas passage tube (9) is installed on the inner side of the piston body (10) via a gas passage piston ring (1).

5. The dual-piston engine according to claim 4, characterized in that: A gas channel inner protrusion (7) is provided on the inner side of one end of the gas channel tube (9) close to the piston body (10).

6. The dual-piston engine according to claim 5, characterized in that: The inner bottom of the piston body (10) is fixedly connected to a control tube (15) via a fixed bearing (14); an outer wall of the control tube (15) is provided with a groove, which fits with a protrusion (7) in the gas passage.

7. The dual-piston engine according to claim 6, characterized in that: The control tube (15) is a hollow tube having four grooves connected end to end in a V-shape, each groove obliquely spanning 1 / 4 of the outer wall of the control tube (15), and the vertical length between the valleys of adjacent grooves is the stroke of the piston body (10). A control tube bottom protrusion (17) is provided at the bottom of the control tube (15) and is movably connected to the valve (11).

8. The dual-piston engine according to claim 1, characterized in that: A valve (11) is installed at the bottom of each of the two piston bodies (10), wherein one valve (11) is used for air intake and the other valve (11) is used for exhaust. The closing of the valve (11) is controlled by a spring. A valve protrusion (18) is provided on the valve (11), and the valve protrusion (18) occupies 1 / 4 of the plane of the valve (11).

9. The dual-piston engine according to claim 1, characterized in that: A positioning body (12) is mounted on the outside of the transmission gear (4) and rotates synchronously with the transmission gear (4). A positioning frame (13) is movably connected to the outside of the positioning body (12). The positioning frame (13) is also movably connected to the inner ring gear (6). One positioning frame (13) is correspondingly movably connected to one positioning body (12) and one inner ring gear (6).

10. The dual-piston engine according to claim 9, characterized in that: The positioning body (12) is a sector-shaped body, the arc center of the sector-shaped body is the center of the circle of the transmission gear (4). The arc radius of the sector-shaped body is half of the sum of the inner width of the positioning frame (13) and the tooth height of the transmission gear (4), and the straight-line distance between the widest parts of the sector-shaped body is the inner width of the positioning frame (13).

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