A dual-cylinder engine structure and a reciprocating in-line parallel shaft internal combustion engine having the same

Abstract

The present invention discloses a two-cylinder engine structure and a reciprocating inline parallel shaft internal combustion engine having the same. The two-cylinder engine structure includes a vibration damping block, a left crankshaft, a left connecting rod, a left piston, a right crankshaft, a right connecting rod, and a right piston. One end of the left crankshaft is connected to the bottom end of the left connecting rod, and the top end of the left connecting rod is connected to the bottom end of the left piston. One end of the right crankshaft is connected to the bottom end of the right connecting rod, and the top end of the right connecting rod is connected to the bottom end of the right piston. The left and right pistons move vertically along their axes. The left and right crankshafts are non-coaxial for power output. The plane formed by the rotational center axis and the rotational center axis is perpendicular to the plane formed by the axes of the left and right pistons. While maintaining vertical piston motion, the present invention can achieve a theoretical value of zero external vibration within the fifth order when used only for power generation and other working conditions, ignoring vibration caused by overturning torque output.

Description

Technical Field

[0001] The present invention relates to a dual-cylinder engine structure and a reciprocating in-line parallel-axis internal combustion engine having the same, belonging to the technical field of mechanical equipment design. Background Art

[0002] Reciprocating engines are a pillar of the current industrial landscape, boasting a vast and mature system. However, the vibration and noise they generate during operation limit their use in many applications, such as range-extending systems for autonomous vehicles, indoor micro-generators, and remote-controlled aerial photography drones, where minimal vibration and low noise are essential.

[0003] Currently, a relatively promising design is the horizontally opposed twin-cylinder engine. If this engine is used solely for power generation, ignoring the vibrations from the overturning torque output, its theoretical external vibration torque is zero. However, the horizontal placement of the pistons precludes the use of lubrication methods used in traditional vertical engines. Furthermore, the problem of eccentric wear on the cylinders is difficult to resolve, significantly hindering the widespread adoption of this engine type. Summary of the Invention

[0004] The present invention aims to overcome the technical deficiencies of the prior art and solve the aforementioned technical problems by providing a dual-cylinder engine structure and a reciprocating inline parallel-shaft internal combustion engine incorporating the same. While maintaining vertical piston motion, the present invention is capable of achieving a theoretical value of zero external vibration up to the fifth order when used solely for power generation and without regard to vibration resulting from overturning torque output. Because the present invention utilizes a vertical cylinder structure, it can utilize existing, mature, and comprehensive design and manufacturing systems, and eliminates the problem of eccentric cylinder wear.

[0005] The present invention specifically adopts the following technical solutions: a two-cylinder engine structure, including a left crankshaft piston-connecting rod mechanism, a right crankshaft piston-connecting rod mechanism arranged in parallel with the left crankshaft piston-connecting rod mechanism, and a vibration-damping block arranged between the left crankshaft piston-connecting rod mechanism and the right crankshaft piston-connecting rod mechanism, the left crankshaft piston-connecting rod mechanism includes a left crankshaft, a left connecting rod, and a left piston, one end of the left crankshaft is connected to the bottom end of the left connecting rod, and the top end of the left connecting rod is connected to the bottom end of the left piston; the right crankshaft piston-connecting rod mechanism includes a right crankshaft, a right connecting rod, and a right piston, one end of the right crankshaft is connected to the bottom end of the left connecting rod, and the top end of the left connecting rod is connected to the bottom end of the left piston; The bottom end of the right connecting rod is connected to the top end of the right piston, and the left piston and the right piston move along their axes in the vertical direction. The axis of the left piston is AA', and the axis of the right piston is BB'. The non-coaxial left crankshaft and the right crankshaft are used to output power. The rotation center axis of the left crankshaft is CC', and the rotation center axis of the right crankshaft is DD'. The plane formed by the rotation center axis CC' and the rotation center axis DD' is perpendicular to the plane formed by the axis AA' of the left piston and the axis BB' of the right piston.

[0006] As a preferred embodiment, the left crankshaft and the right crankshaft are kept synchronous through a mechanical connection, and the piston motion of the left piston and the right piston differs by 180°.

[0007] As a preferred embodiment, the movement on the left crankshaft and the right crankshaft drives the center of gravity of the vibration-absorbing block to reciprocate in the vertical direction through a mechanical structure, and the running trajectory of the vibration-absorbing block is a straight line EE', which is the center line of symmetry between the axis AA' of the left piston and the axis BB' of the right piston.

[0008] As a preferred embodiment, the vibration-absorbing block is a single part or multiple parts.

[0009] As a preferred embodiment, the center of mass of a single part or the equivalent centers of mass of multiple parts are located in the plane formed by the axis AA' of the left piston and the axis BB' of the right piston.

[0010] The present invention also proposes a reciprocating in-line parallel shaft internal combustion engine, including a two-cylinder engine structure and a cylinder body, on which a left rear synchronous gear, a right rear synchronous gear, a rear intermediate gear, a left front synchronous gear, a right front synchronous gear and a front intermediate gear are provided, the left rear synchronous gear and the left front synchronous gear are fixedly connected to the left crankshaft; the right rear synchronous gear and the right front synchronous gear are fixedly connected to the right crankshaft; the left rear synchronous gear and the right rear synchronous gear are respectively engaged with the rear intermediate gear, so that the left rear synchronous gear and the right rear synchronous gear can only rotate in the same direction; the left front synchronous gear and the right front synchronous gear are respectively engaged with the front intermediate gear, so that the left front synchronous gear and the right front synchronous gear can only rotate in the same direction.

[0011] As a preferred embodiment, the right rear synchronous gear and the left rear synchronous gear have the same number of teeth; the number of teeth of the rear intermediate gear is half of the number of teeth of the right rear synchronous gear.

[0012] As a preferred embodiment, the vibration absorber block includes a rear vibration absorber block and a front vibration absorber block. A first sliding pin is provided on the rear intermediate gear, and the first sliding pin is cooperated and connected with a preset first sliding groove of the rear vibration absorber block; the rear vibration absorber block is installed in the first guide groove of the cylinder body; the first sliding pin of the rear intermediate gear and the first sliding groove of the rear vibration absorber block are cooperated and connected, so that when the rear intermediate gear rotates, it drives the rear vibration absorber block to vibrate up and down in the first guide groove of the cylinder body.

[0013] As a preferred embodiment, a second sliding pin is provided on the front middle gear, and the second sliding pin is connected with the preset first sliding groove of the front vibration absorber block; the front vibration absorber block is installed in the second guide groove of the cylinder body, and the second sliding pin of the front middle gear and the second sliding groove of the front vibration absorber block cooperate, so that when the front middle gear rotates, it drives the front vibration absorber block to vibrate up and down in the second guide groove of the cylinder body.

[0014] As a preferred embodiment, the movement of the rear vibration absorber and the front vibration absorber are synchronized with each other and the phase difference is 0°; the movement trajectory of the equivalent center of mass of the combination of the rear vibration absorber and the front vibration absorber is coplanar with the plane formed by the axis AA' of the left piston and the axis BB' of the right piston.

[0015] The beneficial effects achieved by the present invention are as follows: The present invention proposes a new dual-cylinder engine structure, which, under the premise of maintaining the vertical movement of the piston, can achieve a theoretical value of zero external vibration within the fifth order when it is only used for power generation and other working conditions without considering the vibration of the overturning torque output. Due to the use of a vertical cylinder structure, the currently mature and complete design and manufacturing system can be used, and there is no problem of cylinder eccentric wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic plan view of a dual-cylinder engine structure of the present invention;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of a dual-cylinder engine structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the main structure of the crankshaft connecting rod and piston arrangement of the present invention;

[0019] Figure 4 It is a three-dimensional structural diagram of the crankshaft connecting rod and piston arrangement of the present invention;

[0020] Figure 5 2. It is a schematic front view of the positional relationship between the synchronous gear and the rear vibration damping block according to an embodiment of the present invention;

[0021] Figure 6 2. It is a three-dimensional schematic diagram of the positional relationship between the synchronous gear and the rear vibration-absorbing block according to an embodiment of the present invention;

[0022] Figure 7 This is a three-dimensional schematic diagram of the positional relationship between the crankshaft, connecting rod, and piston after adding a synchronous gear and front and rear vibration-absorbing blocks in an embodiment of the present invention;

[0023] Figure 8 This is a schematic front view of the crankshaft connecting rod and piston position relationship after the synchronous gear and the front and rear vibration damping blocks are added in the embodiment of the present invention;

[0024] Figure 9 This is a rear view schematic diagram of the crankshaft connecting rod and piston position relationship after the synchronization gear and front and rear vibration damping blocks are added to the embodiment of the present invention;

[0025] Figure 10 This is a front side schematic diagram of the synchronous gear and the front vibration damping block of the present invention installed on the cylinder body;

[0026] Figure 11 This is a rear schematic diagram of the synchronous gear and rear vibration damping block of the present invention installed on the cylinder body;

[0027] Figure 12 It is a verification principle diagram of an embodiment of the present invention.

[0028] The meaning of the marks in the figure: 1-left crankshaft, 2-left connecting rod, 3-left piston, 4-vibration absorber, 41-rear vibration absorber, 42-front vibration absorber, 5-right piston, 6-right connecting rod, 7-right crankshaft, 8-left rear synchronous gear, 9-right rear synchronous gear, 10-rear intermediate gear, 11-left front synchronous gear, 12-right front synchronous gear, 13-front intermediate gear, 14-cylinder body. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0030] Example 1: Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the present invention proposes a two-cylinder engine structure, including a left crankshaft piston-connecting rod mechanism, a right crankshaft piston-connecting rod mechanism arranged in parallel with the left crankshaft piston-connecting rod mechanism, and a vibration-damping block 4 arranged between the left crankshaft piston-connecting rod mechanism and the right crankshaft piston-connecting rod mechanism. The left crankshaft piston-connecting rod mechanism includes a left crankshaft 1, a left connecting rod 2, and a left piston 3. One end of the left crankshaft 1 is connected to the bottom end of the left connecting rod 2, and the top end of the left connecting rod 2 is connected to the bottom end of the left piston 3; the right crankshaft piston-connecting rod mechanism includes a right crankshaft 7, a right connecting rod 6, a right piston 5, and one end of the right crankshaft 7 The left end is connected to the bottom end of the right connecting rod 6, the top end of the right connecting rod 6 is connected to the bottom end of the right piston 5, the left piston 3 and the right piston 5 move in the vertical direction along their axes, the axis of the left piston 3 is AA', the axis of the right piston 5 is BB', and non-coaxial left crankshaft 1 and right crankshaft 7 are used to output power, the rotation center axis of the left crankshaft 1 is CC', the rotation center axis of the right crankshaft 7 is DD', and the plane formed by the rotation center axis CC' and the rotation center axis DD' is perpendicular to the plane formed by the axis AA' of the left piston 3 and the axis BB' of the right piston 5.

[0031] As a preferred embodiment, the left crankshaft 1 and the right crankshaft 7 are kept synchronous through a mechanical connection, and the piston motions of the left piston 3 and the right piston 5 differ by 180°.

[0032] As a preferred embodiment, the movement on the left crankshaft 1 and the right crankshaft 7 drives the center of gravity of the vibration-absorbing block 4 to reciprocate in the vertical direction through a mechanical structure, and the running trajectory of the vibration-absorbing block 4 is a straight line EE', which is the center line of symmetry between the axis AA' of the left piston 3 and the axis BB' of the right piston 5.

[0033] As a preferred embodiment, the vibration-absorbing block 4 is a single part or multiple parts.

[0034] As a preferred embodiment, the center of mass of a single part or the equivalent centers of mass of multiple parts are located in the plane formed by the axis AA′ of the left piston 3 and the axis BB′ of the right piston 5 .

[0035] Example 2: Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown, the present invention also proposes a reciprocating inline parallel shaft internal combustion engine, including a two-cylinder engine structure and a cylinder body 14. The cylinder body 14 is provided with a left rear synchronous gear 8, a right rear synchronous gear 9, a rear intermediate gear 10, a left front synchronous gear 11, a right front synchronous gear 12, and a front intermediate gear 13. The left rear synchronous gear 8 and the left front synchronous gear 11 are fixedly connected to the left crankshaft 1; the right rear synchronous gear 9 and the right front synchronous gear 12 are fixedly connected to the right crankshaft 7; the left rear synchronous gear 8 and the right rear synchronous gear 9 are respectively engaged with the rear intermediate gear 10, so that the left rear synchronous gear 8 and the right rear synchronous gear 9 can only rotate in the same direction; the left front synchronous gear 11 and the right front synchronous gear 12 are respectively engaged with the front intermediate gear 13, so that the left front synchronous gear 11 and the right front synchronous gear 12 can only rotate in the same direction.

[0036] As a preferred embodiment, the right rear synchronous gear 8 and the left rear synchronous gear 9 have the same number of teeth; the number of teeth of the rear intermediate gear 10 is half of the number of teeth of the right rear synchronous gear 8.

[0037] As a preferred embodiment, the vibration absorbing block 4 includes a rear vibration absorbing block 41 and a front vibration absorbing block 42. A first sliding pin is provided on the rear intermediate gear 10, and the first sliding pin is connected with a preset first sliding groove of the rear vibration absorbing block 41; the rear vibration absorbing block 41 is installed in the first guide groove of the cylinder body 14; the first sliding pin of the rear intermediate gear 10 is connected with the first sliding groove of the rear vibration absorbing block 41, so that when the rear intermediate gear 10 rotates, the rear vibration absorbing block 41 is driven in the first guide groove of the cylinder body 14 according to the principle of the invention. The equation oscillates vertically up and down.

[0038] It should be noted that the vibration absorbing block 4 of this embodiment is composed of two parts, namely the rear vibration absorbing block 41 and the front vibration absorbing block 42 . However, the center of gravity of the assembly formed by the rear vibration absorbing block 41 and the front vibration absorbing block 42 moves along the above-mentioned trajectory straight line EE′.

[0039] As a preferred embodiment, a second sliding pin is provided on the front middle gear 13, and the second sliding pin is connected with the preset first sliding groove of the front vibration-absorbing block 42; the front vibration-absorbing block 42 is installed in the second guide groove of the cylinder body 14, and the second sliding pin of the front middle gear 13 and the second sliding groove of the front vibration-absorbing block 42 cooperate, so that when the front middle gear 13 rotates, it drives the front vibration-absorbing block 42 to vibrate up and down in the second guide groove of the cylinder body 14.

[0040] As a preferred embodiment, the movements of the rear vibration-absorbing block 41 and the front vibration-absorbing block 42 are synchronized with each other and the phase difference is 0°; the motion trajectory of the equivalent center of mass of the combination of the rear vibration-absorbing block 41 and the front vibration-absorbing block 42 is coplanar with the plane formed by the axis AA' of the left piston 3 and the axis BB' of the right piston 5.

[0041] Place the rotation planes of the crankshaft mass centers of the two crankshaft piston connecting rod mechanisms in the same plane, such as Figure 12 As shown, assume that the equivalent center of mass of the crankshaft and part of the connecting rod is m0, the radius of the equivalent center of mass of the crankshaft and part of the connecting rod is r0, the equivalent center of mass of the piston and part of the connecting rod is m1, the mass of the vibration damping block is mz, the connecting rod length is L, the crankshaft radius is r, the distance between the center axes of the two pistons is 2*L0, and the crankshaft rotates at a constant speed with an angular velocity of ω.

[0042] Definition: Cylinder 1 is on the left, and cylinder 2 is on the right. When the crankshaft-connecting rod connection point A of cylinder 1 is on the X-axis to the right of point OL, the gear train ensures that the crankshaft-connecting rod connection point A' of cylinder 2 is on the X-axis to the left of point OR. This position is recorded as time t0.

[0043] Through preliminary design, the following equation is guaranteed to hold:

[0044]

[0045]

[0046] And the vibration damping block moves only in the Y direction, and the motion equation is:

[0047] Y mz =r×cos(2ωt)…………………………………………○C

[0048] 1. For cylinder No. 1:

[0049] The equation of motion for point A is:

[0050] Xa=r×cosωt-L0…………………………………………①

[0051] Ya=r×sinωt…………………………………………②

[0052] The motion equation of the equivalent center of mass of the crankshaft and part of the connecting rod is:

[0053] Xm0=r0×cos(ωt+π)-L0…………………………………………③

[0054] Ym0=r0×sin(ωt+π)…………………………………………④

[0055] The motion equation of the equivalent center of mass of the piston and part of the connecting rod is:

[0056] Xm1=0

[0057] (Ym1-Ya) 2 +(Xa+L0) 2 =L 2 ………………………………⑤

[0058] The piston is above the X axis, and Ym1 is positive:

[0059] The second term of the above equation is expanded by Taylor at -L0 to omit the higher-order terms:

[0060]

[0061] Substituting ① and ②, we get:

[0062]

[0063] 2. Similarly, the equation for cylinder No. 2 can be written:

[0064] The motion equation of the equivalent center of mass of the crankshaft and part of the connecting rod is:

[0065] Xm0′=r0×cos(ωt)+L0………………………………………………………………⑧

[0066] Ym0′=r0×sin(ωt)……………………………………………………⑨

[0067] Xm1'=0

[0068]

[0069] 3. According to the above equation, the inertial force of the entire machine in the x direction is:

[0070]

[0071] The inertial force of the whole machine in the y direction is:

[0072]

[0073] According to the symmetry, there is no vibration torque in the x-direction of the whole machine:

[0074] Mx=0

[0075] The vibration torque of the whole machine in the y direction is:

[0076]

[0077] According to formulas ④, ⑦, ⑨ and ⑩, we can get the following:

[0078] My=2×L0×ω 2 ×sinωt×(m1×r-m0×r0)

[0079] According to design conditions Know: My = 0

[0080] From the above deduction, it can be seen that, ignoring vibrations of order 5 and above, when the output torque of the engine system is an internal force (for example, for power generation), the theoretical value of the vibration caused to the outside is zero.

[0081] The present invention is an even-cylinder engine. The multi-cylinder system is simply a repetition of the dual-cylinder system. A dual-cylinder engine will be used as an example for the following description. The following description is limited to the improved components that differ from conventional engines. Other common systems (such as intake and exhaust, fuel supply, lubrication, and cooling systems) are not detailed here.

[0082] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0083] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including the instruction device, which implements the function specified in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A dual-cylinder engine structure, characterized in that: The invention comprises a left crankshaft piston-connecting rod mechanism, a right crankshaft piston-connecting rod mechanism arranged in parallel with the left crankshaft piston-connecting rod mechanism, and a vibration-damping block (4) arranged between the left crankshaft piston-connecting rod mechanism and the right crankshaft piston-connecting rod mechanism. The left crankshaft piston-connecting rod mechanism comprises a left crankshaft (1), a left connecting rod (2), and a left piston (3). One end of the left crankshaft (1) is connected to the bottom end of the left connecting rod (2), and the top end of the left connecting rod (2) is connected to the bottom end of the left piston (3). The right crankshaft piston-connecting rod mechanism comprises a right crankshaft (7), a right connecting rod (6), and a right piston (5). One end of the right crankshaft (7) is connected to the bottom end of the right connecting rod (6). The top end of the right connecting rod (6) is connected to the bottom end of the right piston (5), and the left piston (3) and the right piston (5) move along their axes in the vertical direction. The axis of the left piston (3) is AA', and the axis of the right piston (5) is BB'. The non-coaxial left crankshaft (1) and the right crankshaft (7) are used to output power. The rotation center axis of the left crankshaft (1) is CC', and the rotation center axis of the right crankshaft (7) is DD'. The plane formed by the rotation center axis CC' and the rotation center axis DD' is perpendicular to the plane formed by the axis AA' of the left piston (3) and the axis BB' of the right piston (5).

2. A dual-cylinder engine structure according to claim 1, characterized in that: The left crankshaft (1) and the right crankshaft (7) are kept synchronous through a mechanical connection, and the piston movements of the left piston (3) and the right piston (5) differ by 180°.

3. A dual-cylinder engine structure according to claim 1, characterized in that: The movement of the left crankshaft (1) and the right crankshaft (7) drives the center of gravity of the vibration-damping block (4) to reciprocate in the vertical direction through a mechanical structure. The running trajectory of the vibration-damping block (4) is a straight line EE', and the straight line EE' is the symmetrical center line of the axis AA' of the left piston (3) and the axis BB' of the right piston (5).

4. A dual-cylinder engine structure according to claim 1, characterized in that: The vibration absorbing block (4) is a single part or multiple parts.

5. A dual-cylinder engine structure according to claim 4, characterized in that: The center of mass of a single part or the equivalent centers of mass of multiple parts are located in the plane formed by the axis AA' of the left piston (3) and the axis BB' of the right piston (5).

6. A reciprocating inline parallel shaft internal combustion engine, characterized in that: The invention comprises a double-cylinder engine structure as claimed in claim 1 and a cylinder body (14), wherein a left rear synchronous gear (8), a right rear synchronous gear (9), a rear intermediate gear (10), a left front synchronous gear (11), a right front synchronous gear (12), and a front intermediate gear (13) are provided on the cylinder body (14), wherein the left rear synchronous gear (8) and the left front synchronous gear (11) are fixedly connected to the left crankshaft (1); the right rear synchronous gear (9) and the right front synchronous gear (12) are fixedly connected to the right crankshaft (7); the left rear synchronous gear (8) and the right rear synchronous gear (9) are respectively engaged with the rear intermediate gear (10), so that the left rear synchronous gear (8) and the right rear synchronous gear (9) can only rotate in the same direction; the left front synchronous gear (11) and the right front synchronous gear (12) are respectively engaged with the front intermediate gear (13), so that the left front synchronous gear (11) and the right front synchronous gear (12) can only rotate in the same direction.

7. A reciprocating inline parallel shaft internal combustion engine according to claim 6, characterized in that: The right rear synchronous gear (8) and the left rear synchronous gear (9) have the same number of teeth; the number of teeth of the rear intermediate gear (10) is half of the number of teeth of the right rear synchronous gear (8).

8. A reciprocating inline parallel shaft internal combustion engine according to claim 6, characterized in that: The vibration absorbing block (4) includes a rear vibration absorbing block (41) and a front vibration absorbing block (42); a first sliding pin is provided on the rear intermediate gear (10), and the first sliding pin is cooperatively connected with a preset first sliding groove of the rear vibration absorbing block (41); the rear vibration absorbing block (41) is installed in the first guide groove of the cylinder body (14); the first sliding pin of the rear intermediate gear (10) and the first sliding groove of the rear vibration absorbing block (41) are cooperatively connected, so that when the rear intermediate gear (10) rotates, it drives the rear vibration absorbing block (41) to vibrate up and down in the first guide groove of the cylinder body (14).

9. A reciprocating inline parallel shaft internal combustion engine according to claim 8, characterized in that: A second sliding pin is provided on the front intermediate gear (13), and the second sliding pin is connected with a preset first sliding groove of the front vibration-absorbing block (42); the front vibration-absorbing block (42) is installed in the second guide groove of the cylinder body (14), and the second sliding pin of the front intermediate gear (13) and the second sliding groove of the front vibration-absorbing block (42) are matched, so that when the front intermediate gear (13) rotates, it drives the front vibration-absorbing block (42) to vibrate up and down in the second guide groove of the cylinder body (14).

10. The reciprocating inline parallel shaft internal combustion engine according to claim 8, characterized in that: The movement of the rear vibration absorbing block (41) and the front vibration absorbing block (42) is synchronized, and the phase difference is 0°; the movement trajectory of the equivalent center of mass of the combination of the rear vibration absorbing block (41) and the front vibration absorbing block (42) is coplanar with the plane formed by the axis AA' of the left piston (3) and the axis BB' of the right piston (5).

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