Four-cylinder crank cross piston mechanism

Abstract

The invention discloses a four-cylinder crank cross-shaped piston mechanism. The four-cylinder crank cross-shaped piston mechanism comprises a stator, a crankshaft, an inner cross-shaped piston, an outer cross-shaped piston and a fluid distribution device. A main air cylinder chamber is arranged in the stator, a crankshaft is arranged in the stator, and a shaft neck of the crankshaft is arranged in a shaft hole of the inner cross-shaped piston. The outer cross-shaped piston is arranged in the main air cylinder, and the first air cylinder and the second air cylinder are distributed at the two ends of the outer cross-shaped piston. An auxiliary air cylinder chamber is axially arranged on the outer cross-shaped piston, the inner cross-shaped piston is arranged in the auxiliary air cylinder chamber, and a third air cylinder and a fourth air cylinder chamber are distributed at the two ends of the inner cross-shaped piston. The inner cross-shaped piston rotates and translates under the action of the crankshaft and drives the outer cross-shaped piston to slide in a cross-shaped mode, the element volumes of the four air cylinders are changed, and fluid conveying work is conducted under the action of the fluid distribution device. The fluid conveying device is novel in structure, easy to manufacture and high in fluid conveying volume efficiency, and an existing fluid and engine movement mechanism can be subversively innovated.

Description

Technical Field

[0001] The present invention is a four-cylinder crank cross piston mechanism, which relates to the technical field of fluid machinery such as positive displacement pumps, hydraulic motors, pneumatic motors, compressors, and engines. Background Art

[0002] Positive displacement fluid machinery and engines rely on working elements to change the working volume to achieve energy conversion. However, existing positive displacement machinery cannot meet market demands due to various defects in the working mechanism; in particular, positive displacement piston fluid machinery and engines driven by a crank connecting rod mechanism have defects such as complex structure and difficult manufacturing, and need further improvement. Summary of the Invention

[0003] The purpose of the present invention is to provide a four-cylinder crank cross piston mechanism, as the working mechanism of positive displacement fluid machinery and engines, to carry out a subversive technological innovation in the structure of existing fluid machinery and engines such as pumps, hydraulic motors, pneumatic motors, compressors, and engines.

[0004] To achieve the above purpose, the technical measures taken are: a four-cylinder crank cross piston mechanism, including a stator, an inner cross piston, an outer cross piston, and a fluid distribution device. A crankshaft is arranged in the bearing seat of the end cover of the stator, and the journal of the crankshaft is arranged in the main cylinder of the stator; the upper wall surface and the lower wall surface of the main cylinder are parallel to each other. An axial hole is arranged in the center of the inner cross piston, and the journal of the crankshaft is movably arranged in the axial hole. The outer cross piston is arranged in the main cylinder, and the outer cross piston reciprocates in the main cylinder chamber; the top of the outer cross piston is distributed with a first cylinder and a second cylinder. A secondary cylinder chamber is axially arranged on the outer cross piston, and the inner cross piston is arranged in the secondary cylinder chamber, and the two ends of the inner cross piston are distributed with a third cylinder and a fourth cylinder chamber. The inner cross piston rotates and translates under the action of the crankshaft and drives the outer cross piston to slide crosswise, and the basic volumes of the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder change to carry out fluid transportation work. The rotating oil distribution disk of the fluid distribution device is arranged on the shaft body of the crankshaft, and four flow channels are arranged on the oil disk of the fluid distribution device, and the four flow channels are respectively communicated with the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder. An oil disk seat is arranged outside the rotating oil distribution disk, and the crankshaft drives the rotating oil distribution disk to rotate. When the crankshaft rotates one circle, four fluid transportation operations are carried out.

[0005] Preferably, the fluid distribution device operates by means of a sliding oil distribution with an external cross piston. A number of upper suction channels and a number of upper discharge channels are provided on the end cover. A number of upper flow channel pipes are provided on the upper inner wall surface of the third cylinder of the external cross piston. The upper flow channel pipes communicate with the upper suction channels, and the third cylinder performs fluid suction work; the upper flow channel pipes communicate with the upper discharge channels, and the third cylinder performs fluid discharge work. A number of lower flow channel pipes are provided on the lower inner wall surface of the fourth cylinder. A number of flow channel pipes are respectively provided on the left and right sides of the shaft hole of the internal cross piston. The first cylinder communicates with the flow channel pipes through the first flow channel groove, and the second cylinder communicates with the flow channel pipes through the second flow channel groove. A number of suction channels and discharge channels are provided on the end cover. The internal cross piston rotates and translates under the drive of the crankshaft to perform sliding oil distribution work; when the flow channel pipes communicate with the suction channels, the first cylinder performs fluid suction work; when the flow channel pipes communicate with the discharge channels, the first cylinder performs fluid discharge work.

[0006] Preferably, the valve group of the fluid distribution device is arranged on the first cylinder, the second cylinder, the third cylinder and the fourth cylinder. The first cylinder, the second cylinder, the third cylinder and the fourth cylinder perform suction and exhaust work through the intake valve and the exhaust valve on the valve group.

[0007] Preferably, the upper flow channel disk of the fluid distribution device is arranged on the upper part of the upper end cover, and a suction groove is provided on the upper flow channel disk. A first oil disk is provided on the end face of the upper end cover, and a second oil disk is provided on the lower end face of the lower end cover; when the upper flow channel disk rotates, it performs oil distribution work with the first oil disk. The lower flow channel disk of the fluid distribution device is arranged on the lower part of the lower end cover; when the lower flow channel disk rotates, it performs oil distribution work with the second oil disk.

[0008] Preferably, a number of stators are combined for multi-cylinder series operation, and a number of journal bearings are provided on the crankshaft.

[0009] Preferably, the volumes of the first cylinder and the second cylinder are larger than the volumes of the third cylinder and the fourth cylinder.

[0010] Preferably, in order to reduce the contact friction and wear between components, sealing elements are provided on the contact sliding surfaces between the stator, the internal cross piston and the external cross piston to improve the sealing effect.

[0011] Preferably, plane rolling bearings are provided on the contact sliding surfaces between the stator, the internal cross piston and the external cross piston to reduce the friction force; or static pressure grooves are provided on the contact sliding surfaces between the stator, the internal cross piston and the external cross piston, and the contact friction and wear between components and the structural stability are reduced through static pressure support.

[0012] Preferably, the four-cylinder crank cross piston mechanism is used as the working mechanism of a multi-stage steam engine, and the working volume of the first working mechanism is smaller than the volume of the second working mechanism.

[0013] Preferably, a four-cylinder crank cross piston mechanism, as the working mechanism of an internal combustion engine, has combustion chambers provided in the first cylinder, the second cylinder, the third cylinder and the fourth cylinder; a spark plug is provided at the top of the combustion chamber, and an intake valve port and an exhaust valve port are provided near the spark plug. An intake valve core is provided in the intake valve port, and an exhaust valve core is provided in the exhaust valve port; the intake valve core and the exhaust valve core perform gas distribution work through a cam device. Beneficial effects

[0014] Based on the above technical solutions, the present invention has at least one of the following beneficial effects: 1. A four-cylinder crank cross piston mechanism of the present invention realizes the fluid delivery work of four cylinders through the transmission of the crankshaft and the cross-sliding of the inner cross piston and the outer cross piston, with a simple structure, stable operation and easy processing; 2. The working principle of the fluid distribution device is the same as that of a four-cylinder piston flowmeter, an external five-star hydraulic motor and a piston pneumatic motor, all of which work through rotary plane oil distribution or axial gas distribution. However, its structure is simpler than that of a four-cylinder piston flowmeter, an external five-star hydraulic motor and a piston pneumatic motor; 3. The sliding work between components is all surface contact sliding clearance sealing, with a stable working structure, not easy for fluid to leak and high volumetric efficiency; 4. The fluid distribution device adopts sliding oil distribution work, without any vulnerable parts, with a long service life and few working faults; 5. There is a gap at the top of the piston, which can transport fluids containing particles; by setting a double-flow channel disc, fluids can be output and input at both ends, which can adapt to the transportation of various media; 6. A number of working mechanisms are provided on one crankshaft, which can work in series or parallel; Therefore, as the working mechanism of a positive displacement fluid machine and an engine, the four-cylinder crank cross piston mechanism can carry out structural disruptive technological innovation on existing fluid machines and engines such as pumps, hydraulic motors, pneumatic motors, compressors and engines. Description of the drawings

[0015] The following further describes the present invention in detail with reference to the drawings.

[0016] Figure 1 It is a schematic structural diagram of a four-cylinder crank cross piston mechanism of the present invention.

[0017] Figure 2 It is a schematic diagram of the fluid distribution device of a four-cylinder crank cross piston mechanism of the present invention.

[0018] Figure 3 It is a schematic diagram of the sliding oil distribution work of a four-cylinder crank cross piston mechanism of the present invention.

[0019] Figure 4It is a working schematic diagram of two rotary oil distribution discs of a four-cylinder crank cross piston mechanism of the present invention.

[0020] Figure 5 It is a structural schematic diagram of the double-acting operation of a four-cylinder crank cross piston mechanism of the present invention.

[0021] Figure 6 It is a working schematic diagram of the two-stage compression of a four-cylinder crank cross piston mechanism of the present invention.

[0022] Figure 7 It is a working schematic diagram of an engine with a four-cylinder crank cross piston mechanism of the present invention.

[0023] 1 - Stator; 2 - End cover; 3 - Crankshaft; 4 - Journal; 5 - Main cylinder; 6 - Upper wall surface; 7 - Lower wall surface; 8 - Inner cross piston; 9 - Axial hole; 11 - Outer cross piston; 12 - First cylinder; 13 - Second cylinder; 14 - Auxiliary cylinder chamber; 15 - Third cylinder; 16 - Fourth cylinder; 21 - Fluid distribution device; 23 - Shaft body; 24 - Oil pan; 25 - Flow channel pipe; 26 - Oil pan seat; 31 - Upper suction flow channel; 32 - Upper discharge flow channel; 33 - Upper inner wall surface; 34 - Upper flow channel pipe; 35 - Lower inner wall surface; 36 - Lower flow channel pipe; 37 - Flow channel pipe; 38 - First flow channel groove; 39 - Second flow channel groove; 40 - Suction flow channel; 41 - Discharge flow channel; 51 - Valve group; 52 - Intake valve; 53 - Exhaust valve; 54 - Upper flow channel disc; 55 - Upper end cover; 56 - Lower flow channel disc; 57 - Lower end cover; 58 - First oil pan; 59 - Suction groove; 60 - Second oil pan; 61 - Counterweight; 62 - First journal; 63 - Second journal; 66 - Combustion chamber; 67 - Spark plug; 69 - Intake valve port; 70 - Exhaust valve port; 71 - Intake valve core; 72 - Exhaust valve core; 73 - Cam device. Specific embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the following further elaborates on the present invention in detail with reference to specific embodiments and the accompanying drawings. Embodiment

[0025] Such as Figure 1As shown in the figure, a four-cylinder crank cross piston mechanism includes a stator 1, an inner cross piston 8, an outer cross piston 11 and a fluid distribution device 21. A crankshaft 3 is arranged in the bearing seat of the end cover 2 of the stator 1, and the journal 4 of the crankshaft 3 is arranged in the main cylinder 5 of the stator 1; the upper wall surface 6 and the lower wall surface 7 of the main cylinder 5 are parallel to each other. A shaft hole 9 is arranged in the center of the inner cross piston 8, and the journal 4 of the crankshaft 3 is movably arranged in the shaft hole 9. The outer cross piston 11 is arranged in the main cylinder 5, and a first cylinder 12 and a second cylinder 13 are respectively arranged at both ends of the cross piston 11. A secondary cylinder 14 is axially arranged on the outer cross piston 11, the inner cross piston 5 is arranged in the secondary cylinder 14, and a third cylinder 15 and a fourth cylinder 16 are distributed at both ends of the inner cross piston 5; the inner cross piston 5 rotates and translates under the action of the crankshaft 3 and drives the outer cross piston 11 to slide crosswise; the basic volumes of the first cylinder 12, the second cylinder 13, the third cylinder 15 and the fourth cylinder 16 change to carry out fluid transportation work; the sliding work between each component is surface contact sliding clearance sealing, and the working structure is stable, the fluid is not easy to leak, and the volumetric efficiency is high. As Figure 1 , Figure 2 shown in the figure, the rotating oil distribution disk 22 of the fluid distribution device 21 is arranged on the shaft body 23 of the crankshaft 3, and four flow channel pipes 25 are arranged on the oil disk 24 of the fluid distribution device 21. The four flow channel pipes 25 are respectively communicated with the first cylinder 12, the second cylinder 13, the third cylinder 15 and the fourth cylinder 16; an oil disk seat 26 is arranged outside the rotating oil distribution disk 22. The crankshaft 3 drives the rotating oil distribution disk 22 to rotate, and when the crankshaft 3 rotates one circle, four fluid transportation operations are carried out. The working principle of the fluid distribution device 21 is the same as that of a four-cylinder piston flowmeter, an external five-star hydraulic motor and a piston pneumatic motor, and all work by rotating plane oil distribution or axial gas distribution. In order to reduce the contact friction and wear between each component, sealing elements are arranged on the contact sliding surfaces between the stator 1, the inner cross piston 8 and the outer cross piston 11 to improve the sealing effect. Plane rolling bearings are arranged on the contact sliding surfaces between the stator 1, the inner cross piston 8 and the outer cross piston 11 to reduce the friction force; or static pressure grooves are arranged on the contact sliding surfaces between the stator 1, the inner cross piston 8 and the outer cross piston 11, and the contact friction and wear and structural stability between each component are reduced through static pressure support. Embodiment

[0026] As Figure 3As shown, the fluid distribution device 21 operates by sliding oil distribution through the outer cross piston 11. Two upper suction channels 31 and two upper discharge channels 32 are provided on the end cap 2. Two upper flow channel pipes 34 are provided on the upper inner wall surface 33 of the third cylinder 15 of the outer cross piston 11. The upper flow channel pipes 34 communicate with the upper suction channels 31, and the third cylinder 15 performs fluid suction work. The upper flow channel pipes 34 communicate with the upper discharge channels 32, and the third cylinder 15 performs fluid discharge work. Two lower flow channel pipes 36 are provided on the lower inner wall surface 35 of the fourth cylinder 16. Two flow channel pipes 37 are respectively provided on the left and right sides of the shaft hole 9 of the inner cross piston 8. The first cylinder 12 communicates with the flow channel pipe 37 through the first flow channel groove 38, and the second cylinder 13 communicates with the flow channel pipe 37 through the second flow channel groove 39. Two suction channels 40 and two discharge channels 41 are provided on the end cap 2. The inner cross piston 8 rotates and translates driven by the crankshaft 3 to perform sliding oil distribution work. When the flow channel pipe 37 communicates with the suction channel 40, the first cylinder 12 performs fluid suction work; when the flow channel pipe 37 communicates with the discharge channel 41, the first cylinder 12 performs fluid discharge work. Embodiment

[0027] As Figure 4 shown, four groups of intake valves 52 and four groups of exhaust valves 53 are provided on the valve group 51 of the fluid distribution device 21; the valve group 51 is provided on the first cylinder 12, the second cylinder 13, the third cylinder 15 and the fourth cylinder 16. The gas in the first cylinder 12, the second cylinder 13, the third cylinder 15 and the fourth cylinder 16 of the valve group 51 performs suction and exhaust work through the intake valves 52 and the exhaust valves 53 on the valve group 51. As Figure 5 shown, the upper flow channel disk 54 of the fluid distribution device 21 is provided above the upper end cap 55. An intake groove 59 is provided on the upper flow channel disk 54; a first oil disk 58 is provided on the end face of the upper end cap 55, and a second oil disk 60 is provided on the lower end face of the lower end cap 57; the upper flow channel disk 54 and the lower flow channel disk 56 are provided on the shaft body 23 of the crankshaft 3; the upper flow channel disk 54 and the first oil disk 58 perform rotational oil distribution work. The lower flow channel disk 56 of the fluid distribution device 21 is provided below the lower end cap 57; a counterweight 61 is provided on the shaft body 23 of the crankshaft 3 below the lower flow channel disk 56; when the lower flow channel disk 56 rotates, it performs oil distribution work with the second oil disk 60. The upper flow channel disk 54 and the lower flow channel disk 56 are movably provided between the shaft body 23 of the crankshaft 3, and a back pressure can be applied to the upper flow channel disk 54 and the lower flow channel disk 56 through a spring (not shown in the figure) to effectively prevent fluid leakage. Embodiment

[0028] As Figure 5As shown, two stators 1 are combined to work in a double-acting eight-cylinder manner, and two journal bearings 4 are provided on the crankshaft 3; the four-cylinder crank cross piston mechanism works in parallel when pumping liquid. The first journal bearing 62 and the second journal bearing 63 are arranged with a 45° stagger. When the pump is pumping liquid, it has low noise and small flow pulsation. As Figure 6 shown, the volumes of the first cylinder 12 and the second cylinder 13 are larger than those of the third cylinder 15 and the fourth cylinder 16. The four-cylinder crank cross piston mechanism as the working mechanism of the pump can output liquids of two different pressures; the four-cylinder crank cross piston mechanism as the working mechanism of a two-stage compressor has a simple structure and stable operation. The four-cylinder crank cross piston mechanism, as the working mechanism of a multi-stage steam engine, the working volume of the first working mechanism is smaller than that of the second working mechanism. By connecting multiple working mechanisms in series through a single crankshaft, multi-stage expansion work is achieved. Embodiment

[0029] As Figure 7 shown, the four-cylinder crank cross piston mechanism, as the working mechanism of an internal combustion engine, combustion chambers 66 are provided in the first cylinder 12, the second cylinder 13, the third cylinder 15 and the fourth cylinder 16. A spark plug 67 is provided at the top of the combustion chamber 66; an intake valve port 69 and an exhaust valve port 70 are provided near the spark plug 67. An intake valve core 71 is provided in the intake valve port 69, and an exhaust valve core 72 is provided in the exhaust valve port 70; the intake valve core 71 and the exhaust valve core 72 perform valve timing through a cam device 73.

[0030] It should also be noted that the directional terms mentioned in the embodiments, such as "up", "down", "inside", "outside", etc., are only references to the directions in the attached drawings and are not used to limit the protection scope of the present invention. In addition, unless specifically described or steps that must occur in sequence, the order of the above steps is not limited to those listed above and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments are obvious to those skilled in the art; the general principles defined herein can be embodied in other instances without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A four-cylinder crank cross piston mechanism, characterized in that, Comprising: A stator (1), in the bearing housing of the end cover (2) of which a crankshaft (3) is provided, and the journal (4) of the crankshaft (3) is arranged in the main cylinder (5) of the stator (1); the upper wall surface (6) and the lower wall surface (7) of the main cylinder (5) are parallel to each other; An inner cross piston (8), in the central part of which a shaft hole (9) is provided, and the journal (4) of the crankshaft (3) is movably arranged in the shaft hole (9); An outer cross piston (11), which is arranged in the main cylinder (5); the outer cross piston (11) reciprocates in the main cylinder chamber (5), and the first cylinder (12) and the second cylinder (13) are distributed at both ends of the outer cross piston (11); a secondary cylinder chamber (14) is axially arranged on the outer cross piston (11), the inner cross piston (5) is arranged in the secondary cylinder chamber (14), and the third cylinder (15) and the fourth cylinder chamber (16) are distributed at both ends of the inner cross piston (5); when the crankshaft (3) rotates, the inner cross piston (5) rotates and translates, and drives the outer cross piston (11) to slide crosswise; the basic volumes of the first cylinder (12), the second cylinder (13), the third cylinder (15) and the fourth cylinder (16) change, and fluid transportation work is carried out; A fluid distribution device (21), the rotary oil distribution disc (22) of which is arranged on the shaft body (23) of the crankshaft (3), and four flow channel pipes (25) are arranged on the oil disc (24) thereof, and the four flow channel pipes (25) are respectively communicated with the first cylinder (12), the second cylinder (13), the third cylinder (15) and the fourth cylinder (16); an oil disc seat (26) is arranged outside the rotary oil distribution disc (22); the crankshaft (3) drives the rotary oil distribution disc (22) to rotate, and when the crankshaft (3) rotates one circle, four times of fluid transportation work are carried out.

2. The four-cylinder crank cross piston mechanism according to claim 1, characterized in that: The fluid distribution device (21) operates by sliding oil distribution through an external cross piston (11). A number of upper suction channels (31) and a number of upper discharge channels (32) are provided on the end cover (2); a number of upper channel pipes (34) are provided on the upper inner wall surface (33) of the third cylinder (15) of the external cross piston (11), and the upper channel pipes (34) communicate with the upper suction channels (31). The third cylinder (15) performs fluid suction work. The upper channel pipes (34) communicate with the upper discharge channels (32), and the third cylinder (15) performs fluid discharge work; a number of lower channel pipes (36) are provided on the lower inner wall surface (35) of the fourth cylinder (16); a number of channel pipes (37) are respectively provided on the left and right sides of the shaft hole (9) of the inner cross piston (8). The first cylinder (12) communicates with the channel pipes (37) through the first channel groove (38), and the second cylinder (13) communicates with the channel pipes (37) through the second channel groove (39); a number of suction channels (40) and discharge channels (41) are provided on the end cover (2); the inner cross piston (8) rotates and translates under the drive of the crankshaft (3) to perform sliding oil distribution work. The channel pipes (37) communicate with the suction channels (40), and the first cylinder (12) performs fluid suction work; the channel pipes (37) communicate with the discharge channels (41), and the first cylinder (12) performs fluid discharge work.

3. A four-cylinder crank cross piston mechanism according to claim 1, characterized in that: The valve group (51) of the fluid distribution device (21) is provided on the first cylinder (12), the second cylinder (13), the third cylinder (15), and the fourth cylinder (16); the first cylinder (12), the second cylinder (13), the third cylinder (15), and the fourth cylinder (16) perform suction and exhaust work through the intake valve (52) and the exhaust valve (53) on the valve group (51).

4. A four-cylinder crank cross piston mechanism according to claim 1, characterized in that: The upper channel plate (54) of the fluid distribution device (21) is arranged above the upper end cover (55), and a suction groove (59) is provided on the upper channel plate (54); a first oil pan (58) is provided on the end face of the upper end cover (55), and a second oil pan (60) is provided on the lower end face of the lower end cover (57); the upper channel plate (54) and the lower channel plate (56) are respectively arranged on the shaft body (23) of the crankshaft (3); when the upper channel plate (54) rotates, it performs oil distribution work with the first oil pan (58); the lower channel plate (56) of the fluid distribution device (21) is arranged below the lower end cover (57); when the lower channel plate (56) rotates, it performs oil distribution work with the second oil pan (60).

5. A four-cylinder crank cross piston mechanism according to claim 1 or 2, characterized in that: The several stators are combined for multi-cylinder series operation, and a number of journal bearings (4) are provided on the crankshaft (3).

6. According to claim 1 or a four-cylinder crank cross piston mechanism as described, characterized in that: The volumes of the first cylinder (12) and the second cylinder (13) are larger than the volumes of the third cylinder (15) and the fourth cylinder (16).

7. A four-cylinder crank cross piston mechanism according to claim 1 or 2, characterized in that: In order to reduce the contact friction and wear between components, sealing elements are provided on the contact sliding surfaces between the stator (1), the inner cross piston (8), and the external cross piston (11) to improve the sealing effect.

8. A four-cylinder crank cross piston mechanism according to claim 1 or 2, characterized in that: A plane rolling bearing is provided on the contact sliding surfaces between the stator (1), the inner cross piston (8) and the outer cross piston (11) to reduce the frictional force; or static pressure grooves are provided on the contact sliding surfaces between the stator (1), the inner cross piston (8) and the outer cross piston (11), and the contact friction and wear between components and the structural stability are reduced through hydrostatic support.

9. A four-cylinder crank cross piston mechanism according to claim 5, characterized in that: The four-cylinder crank cross piston mechanism, as the working mechanism of a multi-stage steam engine, has a working volume of the first working mechanism smaller than that of the second working mechanism.

10. A four-cylinder crank cross piston mechanism according to claim 1, characterized in that: The four-cylinder crank cross piston mechanism, as the working mechanism of an internal combustion engine, has combustion chambers (66) provided in the first cylinder (12), the second cylinder (13), the third cylinder (15) and the fourth cylinder (16). A spark plug (67) is provided at the top of the combustion chamber (66), and an intake valve port (69) and an exhaust valve port (70) are provided near the spark plug (67); an intake valve core (71) is provided in the intake valve port (69), and an exhaust valve core (72) is provided in the exhaust valve port (70); the intake valve core (71) and the exhaust valve core (72) perform gas distribution work through a cam device (73).

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