WO2018137478A1 - Engine having planetary gears and rotary cylinder - Google Patents

Abstract

An engine having planetary gears and a rotary cylinder, comprising: a planetary gear assembly, a rotary cylinder assembly, a central air distribution valve (31) and a piston assembly. The rotary cylinder assembly rotates by using the central air distribution valve (31) as a center, while a piston (41) pushes the planetary gears (12) to move along an inner gear ring (13) and drives a sun gear (11) so as to output power. The present engine has the advantages of being simple, reliable, working stably, being high-power, and the like.

Description

Planetary gear rotary cylinder engine Technical field

The present invention relates to a planetary gear rotary cylinder engine.

Background technique

The conventional four-stroke piston reciprocating engine fixes the cylinder liner to the body and converts the linear motion of the piston into the rotational motion of the crankshaft. The main disadvantages of this kind of engine are: 1. The structure is complex, the volume is large, the thermal efficiency is low, 2. The ventilation mechanism is complicated, there is a dead point when doing circular motion, 3. The reciprocating inertia force caused by the reciprocating motion of the piston in the crank linkage mechanism And the moment of inertia cannot be completely balanced.

Summary of the invention

In order to solve the problem of the complicated structure of the existing engine, the present invention provides a planetary gear rotary cylinder engine, wherein the rotary cylinder assembly of the rotary cylinder engine rotates around a central valve, and the cylinder is rotated around the cylinder. A four-stroke work cycle. When working, the piston pushes the planetary gear to run along the inner ring gear and drives the sun gear to output power to the outside. The engine is characterized by simplicity, reliability, smooth operation and high power.

The technical solution adopted by the present invention to solve the technical problem thereof is:

A planetary gear rotary cylinder engine comprising:

The planetary gear assembly includes a sun gear, a planetary gear and an inner ring gear which are connected from the inside to the outside in sequence, the sun gear can rotate, the planetary gear can rotate and revolve around the sun wheel;

a rotary cylinder assembly rotatable about a centerline of the sun gear, the rotary cylinder assembly including a cylinder corresponding to the planetary gear, the cylinder containing an inner chamber;

a central valve, the gas can enter the inner chamber through a central valve, and the gas in the chamber can also be discharged through the central valve;

a piston assembly comprising a piston and a piston pin, wherein the piston is matched and disposed in the inner chamber, the piston is reciprocally movable along a radial direction of the inner ring gear, the planetary gear is connected to the piston through the piston pin, and the center line of the piston pin is offset from the planetary gear Center line

When the piston moves in the radial direction of the inner ring gear, the piston can drive the planetary gear to rotate and the cylinder and the planetary gear revolve around the sun gear, and the planetary gear can drive the sun gear to rotate.

The utility model has the advantages that the planetary gear rotary cylinder engine has the advantages of simple structure, stable operation, durability, high reliability, and the like, the piston reciprocates linearly in the cylinder, reduces lateral frictional resistance, and realizes a four-stroke engine port. Ventilation at the mouth, low resistance to ventilation, and thorough ventilation. The crankshaft linkage of the conventional engine and the cumbersome valve train are basically eliminated. Greatly improved engine efficiency. The planetary gear rotary cylinder engine inherits the cylinder piston structure of the conventional engine, which not only works reliably, but also meets the modern environmental emission requirements.

DRAWINGS

The accompanying drawings, which are incorporated in the claims of the claims

1 is a schematic view showing the structure of a planetary gear rotary cylinder engine according to the present invention.

Figure 2 is a schematic view of the direction A in Figure 1.

Figure 3 is a schematic view of the structure of a rotary cylinder assembly.

4 is a schematic structural view of a central gas distribution valve.

Figure 5 is a schematic view of the structure of the piston assembly.

11, the sun wheel; 12, planetary gear; 13, the inner ring gear;

21, cylinder; 22, combustion chamber; 23, air exchange port; 24, piston pin running groove; 25, first cooling water channel; 26, central gas distribution hole; 27, sealing ring groove; 28, piston pin mounting hole;

31, central valve; 32, spark plug;

41, piston; 42, piston pin;

51. a housing;

311, air inlet; 312, ignition port; 313, exhaust port; 314, intake port; 315, exhaust channel; 316, second cooling channel.

detailed description

It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments.

A planetary gear rotary cylinder engine comprising:

The planetary gear assembly includes a sun gear 11, a planetary gear 12 and an inner ring gear 13 connected in order from the inside to the outside, the sun gear 11 can rotate, and the planetary gear 12 can rotate and revolve around the sun gear 11;

The rotary cylinder assembly is rotatable about a center line of the sun gear 11, and the rotary cylinder assembly includes a cylinder 21 corresponding to the planetary gear 12, that is, the cylinder 21 and its corresponding planetary gear 12 are along the center line direction of the sun gear 11. Arranged adjacent to each other, the cylinder 21 contains an inner chamber;

The central gas distribution valve 31 can enter the inner chamber through the central gas distribution valve 31, and the gas in the inner chamber can also be discharged through the central gas distribution valve 31;

The piston assembly includes a piston 41 and a piston pin 42. The piston 41 is matched and disposed in the inner chamber. Both the piston 41 and the piston pin 42 are reciprocally movable in the radial direction of the inner ring gear 13. The planetary gear 12 passes through the piston pin 42. Connected to the piston 41, the center line of the piston pin 42 is offset from the center line of the planetary gear 12;

When the piston 41 moves in the radial direction of the ring gear 13, the piston 41 can drive the planetary gear 12 to rotate and the cylinder 21 and the planetary gear 12 revolve around the sun gear 11, and the planetary gear 12 can drive the sun gear 11 to rotate while performing the rotation and revolution. , as shown in Figure 1 and Figure 2.

When the planetary gear rotary cylinder engine is in operation, the rotary cylinder assembly rotates about the center line of the sun gear 11. The piston 41 is operated by a concentric point (a limit point near the center line of the sun gear 11) toward a telecentric point (a limit point away from the center line of the sun gear 11) and pushes the planetary gear 12 to rotate. The planetary gear 12 runs along the orbit of the ring gear 13, and transmits power to the sun gear 11, and is rotated by the sun gear 11 and output to the outside.

In this embodiment, the planetary gear rotary cylinder engine further includes a housing 51. The housing 51 is sleeved outside the inner ring gear 13. The inner ring gear 13 and the central air distribution valve 31 are both fixed relative to the housing 51, such as Both the ring gear 13 and the center valve 31 are fixedly coupled to the housing 51, and the ring gear 13 and the center valve 31 are neither movable nor the housing 51. The central gas distribution valve 31 cooperates with the rotary cylinder assembly to achieve precise valve timing.

In the present embodiment, the planetary gear rotary cylinder engine includes two spaced apart planetary gear assemblies, two of the planetary gear assemblies, along the centerline direction of the sun gear 11, i.e., perpendicular to the paper direction of FIG. Mirror images of each other, the centerlines of the sun gears 11 of the two planetary gear assemblies coincide, the rotary cylinder assembly being located between the two planetary gear assemblies, one cylinder 21 corresponding to two planet gears 12, ie two planets The gear 12 is connected to a cylinder 21 correspondingly. The planetary gear rotary cylinder engine may also contain more than three of the planetary gear assemblies, and more than one of the planetary gear assemblies may be disposed on the left and right sides of the rotary cylinder assembly in FIG.

In the present embodiment, the center line of the sun gear 11 coincides with the center line of the ring gear 13, and one of the planetary gear assemblies includes a plurality of planet gears 12, and the plurality of planet gears 12 are arranged along the circumferential direction of the sun gear 11, The cylinders 21 in the rotary cylinder assembly are in one-to-one correspondence with the number and position of the planetary gears 12 in the planetary gear assembly, as shown in Figures 1 and 2. Preferably, one of the planetary gear assemblies includes four identical planetary gears 12 (in this embodiment, the planetary gear rotary cylinder engine includes two sets of the planetary gear assemblies, and two sets of the planetary gear assemblies include four pairs of identical planetary gears 12 The four cylinders 21 in the rotary cylinder assembly are in one-to-one correspondence with the four pairs of the planetary gears 12 of the two sets of the planetary gear assemblies. One piston pin 42 passes through the piston 41. The two ends of the piston pin 42 are respectively associated with two planets. The gears 12 are inserted, as shown in FIG. 5, and the four planetary gears 12 are evenly distributed along the circumferential direction of the sun gear 11, and the number of teeth of the inner ring gear 13 is four times that of the planetary gears 12, that is, one planetary gear 12 is internally toothed. The inner circumference of the ring 13 rotates four times, one of the four cylinders 21 of the four cylinders 41 is synchronously operated, and the two pistons 41 of the four cylinders 21 are operated in the same state. That is, the working states of the two pistons 41 in the upper and lower two cylinders 21 in FIG. 1 are the same in real time, and the operating states of the two pistons 41 in the left and right cylinders 21 in FIG. 1 are the same in real time.

In the present embodiment, one end of the inner chamber of the cylinder 21 faces the center line of the sun gear 11, the center line of the piston 41 is disposed along the radial direction of the sun gear 11, and the center line of the piston 41 and the center line of the sun gear 11 Vertically and intersecting, a closed combustion chamber 22 is disposed between the piston 41 and one end of the inner chamber, and one end of the inner chamber is provided with a gas exchange port 23 communicating with the inner and outer portions of the combustion chamber 22, as shown in FIG. And Figure 3 shows.

In the present embodiment, the central gas distribution valve 31 has a truncated cone-like structure, the center line of the central gas distribution valve 31 coincides with the center line of the sun gear 11, and the central gas distribution valve 31 and the sun gear 11 are along the center line of the sun gear 11. The directions are sequentially arranged, the central gas distribution valve 31 is matched to the middle portion of the rotary cylinder assembly, and one end of the cylinder 21 is matched with the outer circumferential surface of the central gas distribution valve 31, that is, one end of the cylinder 21 and the central gas distribution valve 31 The shape and size of the outer peripheral surface correspond to each other. As shown in FIGS. 1 to 4, along the circumferential direction of the central gas distribution valve 31, the outer surface of the central gas distribution valve 31 is sequentially provided with an intake port 311, an ignition port 312, and an exhaust gas. The port 313 can only communicate with the intake port 311, the ignition port 312, or the exhaust port 313 when the rotary cylinder assembly rotates around the central valve valve 31. The rotary cylinder assembly includes four cylinders 21, and the outer surface of the central valve 31 is provided with two air inlets 311, two ignition ports 312 and two exhaust ports 313, and one of the two ignition ports 312 is provided. The spark plug 32 is as shown in FIG.

In the present embodiment, the moving trajectory of the piston 41 in the cylinder 21 is the minimum distance (near point) between the center valve 31 and the distance from the central valve 31 (far) The reciprocating movement between the heart points), when the piston 41 moves away from the central valve 31, the venting port 23 can communicate with the intake port 311; when the distance between the piston 41 and the central valve 31 is minimized At the time of the value, the ventilating opening 23 can communicate with the ignition port 312; when the piston 41 moves in the direction of approaching the central valve 31, the venting port 23 can communicate with the exhaust port 313.

In the present embodiment, the air inlet 311 is in communication with the air inlet 314 in the central air distribution valve 31. The ignition port 312 is provided with a spark plug 32 for igniting the combustible gas in the combustion chamber 22, and the air outlet 313 In communication with the exhaust passage 315 in the central valve 31, the gas can sequentially enter the combustion chamber 22 of the inner chamber through the intake passage 314, the intake port 311 and the venting port 23, the combustion chamber of the inner chamber The gas in 22 can be sequentially discharged through the ventilating port 23, the exhaust port 313, and the exhaust port 315.

In this embodiment, a gas seal port 23 is provided with a seal ring groove 27 for preventing air leakage, and a seal ring groove 27 is provided with a high temperature resistant seal ring, and the rotary cylinder assembly is provided with a first cooling water channel 25, The central gas distribution valve 31 includes a second cooling water passage 316. The ratio of the outer diameter of the central gas distribution valve 31 to the inner diameter of the inner chamber is greater than or equal to 1:1.5, and the cylinder wall of the cylinder 21 is provided with a piston pin. 42 passes through the piston pin running groove 24, the center line of the piston pin 42 is parallel to the center line of the planetary gear 12, and the distance between the center line of the piston pin mounting hole 28 of the planetary gear 12 and the center line of the planetary gear 12 (eccentric The value is one-half of the working stroke of the piston 41 (the distance between the concentric point and the telecentric point), the piston pin running groove 24 is opened in the radial direction of the inner ring gear 13, and the piston pin 42 can correspond to the piston 41 or The planetary gear 12 rotates. Preferably, the piston pin 42 is fixedly inserted into the piston pin mounting hole 28 of the planetary gear 12. The piston pin 42 cannot rotate relative to the planetary gear 12. The piston pin 42 can rotate relative to the cylinder 21, as shown in FIG. . A central gas distribution hole 26 for mounting the central gas distribution valve 31 is provided at the center of the rotary cylinder assembly, and the combustion chamber 22 communicates with the central gas distribution hole 26 through the gas exchange port 23. The central gas distribution hole 26 is matched with the central gas distribution valve 31, that is, the central gas distribution hole 26 has the same taper as the central gas distribution valve 31, and the central gas distribution valve 31 is also connected with a force applying member which can give the center The valve 31 has a force acting in the axial direction of the center valve 31, which is directed from the bottom of the truncated cone-shaped central valve 31 to the top thereof for a reliable sealing effect.

In addition, the technical indexes of the dimensions, structure, number of teeth, and modulus of the planetary gear 12 members in the two sets of the planetary gear mechanisms are completely identical, and the number of the planetary gears 12 and the cylinders 21 in each of the planetary gear mechanisms is the same. The plurality of cylinders 21 in the rotary cylinder assembly may be radially, as shown in FIG. 1, or the center line of the cylinder 21 may be tangent to the central valve valve 31. Each cylinder 21 has only one ventilation port 23 shared by the intake and exhaust. The ventilation port can be designed as a circle, a square, a rectangle or the like according to requirements, and the central valve 31 and the central gas distribution hole 26 should have the same taper. If it is necessary to directly inject fuel into the cylinder 21, a fuel supply system should also be provided. The distance between the center point of the planetary gear 12 and the center point of the piston pin 42 is 1/2 stroke. The gear ratio of the ring gear track to the planet gears is 4:1.

The operation of the planetary gear rotary cylinder engine is described below. The planetary gear rotary cylinder engine includes four strokes of an intake stroke, a contraction stroke, a work stroke, and an exhaust stroke.

It is assumed that the piston 41 in the engine cylinder is at the concentric point, as shown by the cylinder 21 and the planetary gear 12 on the left side of FIG. 1, the intake will be started, and the point is 0°, and the rotary cylinder assembly is The center valve 31 is rotated clockwise from the center. Start the engine (related to the engine's ventilation port early opening and closing and ignition advancement and other technical indicators. The engine is fully achievable, do not discuss too much here).

Intake stroke: the planetary gear 12 (taking the planetary gear 12 on the left side in FIG. 1 as an example) runs along the inner ring gear 13 to drive the piston 41 to move from the concentric point to the telecentric point and push the rotary cylinder assembly forward. When the needle is operated, the air vent 23 on the cylinder 21 (the cylinder 21 corresponding to the planetary gear 12 on the left side in FIG. 1) overlaps with the air inlet 311 on the central air distribution valve 31, and the combustible mixture is sucked into the cylinder. Within 21, the intake air ends until the piston 41 reaches the telecentric point. During this stroke, the venting port 23 on the cylinder 21 and the air inlet 311 on the central valve 31 form a closed→open→closed relationship. While the planetary gear 12 is running 45° (0° to 45°) on the inner ring gear 13, the planetary gear is self-transmitted (180°), and the piston 41 completes the intake stroke from the near center point to the telecentric point.

The contraction stroke: the planetary gear 12 and the rotary cylinder assembly continue to operate clockwise, the air exchange port 23 on the cylinder 21 is in a closed state, and the piston 41 runs from the telecentric point to the near center point and compresses the combustible mixture in the cylinder 21, Until the piston 41 reaches the near center point. At this time, the combustible mixture is completely compressed into the cylinder combustion chamber 22. The venting port 23 overlaps with the ignition port 312 mounted on the central gas distribution valve 31. During this stroke, the planetary gear 12 is self-transmitted by 180°, and the inner ring gear 13 is again operated by 45° to reach the upper side of FIG. The position of the planetary gear 12, the planetary gear 12 is operated from 45° to 90° on the inner ring gear 13, and the piston 41 is operated from the telecentric point to the close-point point to complete the compression stroke.

Power stroke: Planetary gear 12 and cylinder 21 continue to run clockwise. The spark plug 32 in the ignition port 312 points the combustible gas in the combustion chamber 22, and the high pressure gas after the combustion pushes the piston 41 to operate from the near center point to the telecentric point, and the piston 41 pushes the planetary gear 12 to rotate and runs along the inner ring gear 13. At the same time, the rotary cylinder assembly is rotated clockwise around the central valve 31. The venting port 23 is always closed in this stroke. In this stroke, the planetary gear 12 self-transmits 180°, and the inner ring gear 13 runs 45° again. The planetary gear 12 runs from 90° to 135° on the inner ring gear 13 and the piston 41 is close to the center point. Run to the telecentric point and the work journey is completed.

Exhaust stroke: the planetary gear 12 and the rotary cylinder assembly continue to run clockwise, the piston 41 runs from the telecentric point to the near center point, and the venting port 23 on the cylinder 21 overlaps with the exhaust port 313 on the central valve 31. When opened, the burned exhaust gas is forcibly pushed out of the cylinder by the piston 41, and the exhaust stroke is completed. In this stroke, the planet wheel rotates (180°), and the inner ring gear 13 runs 45° again to reach the position of the planetary gear 12 on the right side in FIG. 1 , in which the planetary gear 12 is 135° on the inner ring gear 13 . Running to 180°, the piston 41 travels from the telecentric point to the near center point. The ventilating port 23 and the exhaust port 313 on the central valve 31 form a closed→open→closed relationship. At this point, the planetary gear rotary cylinder engine completes a four-stroke duty cycle and the engine continues to operate, allowing for the next four-stroke cycle.

The ratio of the number of teeth of the inner ring gear 13 of the planetary gear rotary cylinder engine to the planetary gear 12 is 4:1, that is, the planetary gear 12 rotates along the inner ring gear 13 for 4 weeks (1440°) to drive the rotary cylinder assembly along the internal teeth. Loop 13 runs one revolution (360°) and a four-stroke duty cycle only needs (720°. Therefore, every revolution of the rotary cylinder assembly (360°), the planetary gear rotary cylinder engine will have two four-stroke working cycles. Each of the cylinders 21 of the rotary cylinder assembly is operated at 180. The planetary gears rotate the cylinder engine to complete a four-stroke duty cycle, and the engine continues to operate to enter the next four-stroke working cycle.

The engine adopts the same working mode of the corresponding two cylinders 21, and the corresponding two cylinders 21 simultaneously compress work. At the same time intake and exhaust. Due to the structure and the requirements of the gas distribution, the pistons 41 in all the cylinders must be synchronized at the same time, that is, all the pistons 41 must be synchronized and operated in one direction at the same time (from the near center point to the telecentric point, and vice versa from the telecentric point to the near center point) .

The above is only the specific embodiment of the present invention, and the scope of the invention is not limited thereto, so the replacement of the equivalent components, or the equivalent changes and modifications according to the scope of the patent protection of the present invention should still be covered by this patent. The scope. In addition, the technical features and technical features in the present invention, the technical features and technical solutions, and the technical solutions and technical solutions can be used in combination freely.

Claims (10)

A planetary gear rotary cylinder engine, characterized in that the planetary gear rotary cylinder engine comprises: The planetary gear assembly includes a sun gear (11), a planetary gear (12) and an internal ring gear (13) connected in series from the inside to the outside, the sun gear (11) can rotate, and the planetary gear (12) can rotate and revolve around the sun gear ( 11) Revolving; a rotary cylinder assembly rotatable about a center line of a sun gear (11), the rotary cylinder assembly including a cylinder (21) corresponding to the planetary gear (12), the cylinder (21) having an inner chamber therein; a central gas distribution valve (31) through which gas can enter the inner chamber, and gas in the inner chamber can also be discharged through the central gas distribution valve (31); a piston assembly comprising a piston (41) and a piston pin (42), the piston (41) being matched and disposed in the inner chamber, the piston (41) being reciprocally movable along a radial direction of the inner ring gear (13), the planetary gear (12) being connected to the piston (41) by the piston pin (42), the center line of the piston pin (42) deviating from the center line of the planetary gear (12); When the piston (41) moves in the radial direction of the ring gear (13), the piston (41) can drive the planetary gear (12) to rotate and the cylinder (21) and the planetary gear (12) revolve around the sun gear (11), the planet The gear (12) is capable of driving the sun gear (11) to rotate. The planetary gear rotary cylinder engine according to claim 1, wherein the planetary gear rotary cylinder engine further comprises a casing (51), and the casing (51) is sleeved outside the inner ring gear (13), the inner ring gear (13) and the central valve (31) are both fixed relative to the housing (51). A planetary gear rotary cylinder engine according to claim 1, wherein the planetary gear rotary cylinder engine includes two of said planetary gear assemblies, two of said planetary gear assemblies, along a center line direction of a sun gear (11) Mirroring each other, the centerlines of the sun gears (11) of the two planetary gear assemblies coincide, and the rotary cylinder assembly is located between the two planetary gear assemblies. A planetary gear rotary cylinder engine according to claim 1, wherein a center line of the sun gear (11) coincides with a center line of the ring gear (13), and the planetary gear assembly includes a plurality of planetary gears (12) A plurality of planetary gears (12) are arranged along a circumferential interval of the sun gear (11), and the cylinders (21) in the rotary cylinder assembly have a one-to-one correspondence with the number and positions of the planetary gears (12) in the planetary gear assembly. A planetary gear rotary cylinder engine according to claim 4, wherein the planetary gear assembly includes four identical planetary gears (12), and the four planetary gears (12) are evenly distributed along the circumference of the sun gear (11) Distributed, the number of teeth of the ring gear (13) is four times the number of teeth of the planetary gear (12). The rotary cylinder assembly contains four cylinders (21), and four of the four cylinders (21) operate synchronously. The two opposite pistons (41) of the four cylinders (21) operate in the same state. A planetary gear rotary cylinder engine according to claim 1, wherein one end of said inner chamber of said cylinder (21) faces a center line of the sun gear (11), a center line of the piston (41) and a sun gear ( 11) The center line is perpendicular and intersects, and a closed combustion chamber (22) is disposed between the piston (41) and one end of the inner chamber, and one end of the inner chamber is provided with an inner portion connecting the combustion chamber (22) And the external air vent (23). A planetary gear rotary cylinder engine according to claim 6, wherein the central valve (31) has a truncated cone structure, and a center line of the center valve (31) coincides with a center line of the sun gear (11). One end of the cylinder (21) is matched with the outer peripheral surface of the central gas distribution valve (31), and along the circumferential direction of the central gas distribution valve (31), the outer surface of the central gas distribution valve (31) is sequentially provided with an air inlet ( 311), an ignition port (312) and an exhaust port (313), when the rotary cylinder assembly rotates around the central valve (31), the air exchange port (23) can only be coupled with the air inlet (311), and the ignition The port (312) or the exhaust port (313) is in communication. The planetary gear rotary cylinder engine according to claim 7, wherein the ventilating port (23) is capable of interacting with the intake port (311) when the piston (41) moves away from the central valve (31). Connected; when the distance between the piston (41) and the central valve (31) reaches a minimum, the vent (23) can communicate with the ignition port (312); when the piston (41) approaches the central valve When the direction of (31) is moved, the air passage (23) can communicate with the exhaust port (313). The planetary gear rotary cylinder engine according to claim 7, wherein the intake port (311) communicates with an intake passage (314) in the central valve (31), and a spark plug is provided in the ignition port (312). (32) The exhaust port (313) communicates with the exhaust passage (315) in the central valve (31), and the gas can sequentially pass through the intake port (314), the intake port (311), and the air exchange port ( 23) Entering the inner chamber, the gas in the inner chamber can be sequentially discharged through the gas exchange port (23), the exhaust port (313), and the exhaust port (315). A planetary gear rotary cylinder engine according to claim 7, wherein a gas seal port (23) is provided with a seal ring groove (27) for preventing air leakage, and a seal ring is provided in the seal ring groove (27). a first cooling water channel (25) is disposed in the rotary cylinder assembly, and a central cooling valve (31) is included in the central gas distribution valve (31), an outer diameter of the central gas distribution valve (31) and the inner chamber The ratio of the inner diameter is greater than or equal to 1:1.5, and the cylinder wall of the cylinder (21) is provided with a piston pin running groove (24) for the piston pin (42) to pass therethrough, and the center line of the piston pin (42) is parallel to the planetary gear The center line of (12), the distance between the center line of the piston pin mounting hole (28) of the planetary gear (12) and the center line of the planetary gear (12) is one-half of the working stroke of the piston (41), and the piston The pin running groove (24) is opened in the radial direction of the inner ring gear (13), and the center of the rotary cylinder assembly is provided with a central gas distribution hole (26) for mounting the central gas distribution valve (31), and the central gas distribution valve (31) Matching the central gas distribution hole (26), the combustion chamber (22) communicates with the central gas distribution hole (26) through the gas exchange port (23).

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