Horizontally opposed engine with coaxially arranged connecting rods

Abstract

The horizontally-opposed engine comprises a connecting rod assembly, a crankshaft, a first air cylinder and a second air cylinder, the first air cylinder and the second air cylinder are horizontally, coaxially and oppositely distributed, and the connecting rod assembly comprises a first connecting rod and a second connecting rod which are detachably connected with each other and are coaxially arranged; an oblong hole matched with a shaft neck of a crankshaft is formed between the first connecting rod and the second connecting rod, the shaft neck is installed in the oblong hole, the first connecting rod is connected with a piston of the first air cylinder, and the second connecting rod is connected with a piston of the second air cylinder. Compared with the prior art, the connecting rod assembly has the advantages that the axial size of the engine is remarkably shortened, the manufacturing and maintenance cost of the connecting rod assembly is reduced, and output torque and efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of engines, and in particular to a horizontally opposed engine with coaxially arranged connecting rods. Background Art

[0002] The horizontally opposed engine has been around since the 1960s. The pistons of this type of engine are evenly distributed on both sides of the crankshaft and move horizontally from side to side, which can reduce the overall height and center of gravity of the engine. At the same time, the engine is installed on the center line of the vehicle, and the torques generated by the pistons on both sides offset each other, greatly reducing the vibration of the vehicle during driving, increasing the engine speed and reducing noise. It has the characteristics of low center of gravity, smooth linear acceleration, precise engine response and abundant torque output in the low speed area.

[0003] For example, the invention with publication number CN106812603A discloses a horizontally opposed engine, including four horizontally opposed cylinders and pistons arranged in the cylinders, as well as a connecting rod assembly and a gear transmission mechanism, the connecting rod assembly includes connecting rod 1 and connecting rod 2, the two ends of connecting rod 1 are respectively connected to piston 1 and piston 2, and the two ends of connecting rod 2 are respectively connected to piston 3 and piston 4; the gear transmission mechanism includes ratchet 1, ratchet 2, gear 1, gear 2 and a transmission gear, the ratchet 1 is coaxially arranged with the gear, the ratchet 2 is coaxially arranged with the gear 2, and the directions of the ratchet 1 and the ratchet 2 are the same, the transmission gear is arranged between the gear 1 and the gear 2, and are respectively meshed with the gear 1 and the gear 2; racks are respectively provided on the connecting rod 1 and the connecting rod 2, and the racks on the connecting rods are respectively meshed with the ratchet wheels; the transmission gear is connected to the power output shaft.

[0004] Although the above-mentioned existing horizontally opposed engines have outstanding advantages that other types of engines do not have, they also have some outstanding defects: due to the use of rack and ratchet mechanism, when the cylinder moves at high speed, the ratchet has been worn or does not bite, and the I-shaped single-sided straight tooth connecting rod mechanism is not well stressed. At the same time, there is no restriction mechanism for the axial movement of the connecting rod, which makes the compression ratio of the cylinder unstable, thereby causing the engine to run unstable. Due to gravity, the horizontal cylinder will cause the oil to flow to the bottom, so that one side of the cylinder cannot be fully lubricated. High-precision manufacturing brings higher maintenance costs, and due to the wide body, it is not conducive to the layout of the car. At the same time, due to the horizontal placement of the piston and the effect of its own gravity, the friction between the top and bottom of the horizontal reciprocating movement and the cylinder liner is different, resulting in eccentric wear and shortening the service life of the engine. Summary of the invention

[0005] The purpose of the present invention is to provide a horizontally opposed engine with a coaxial connecting rod arrangement in order to overcome the defects of the above-mentioned prior art that the horizontally opposed structure is often complex in structure, difficult to lubricate, and the high precision of the parts makes the manufacturing and maintenance costs of the engine high.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A horizontally opposed engine with coaxial connecting rod arrangement includes a connecting rod assembly, a crankshaft, a first cylinder and a second cylinder, wherein the first cylinder and the second cylinder are coaxially arranged horizontally, the connecting rod assembly includes a first connecting rod and a second connecting rod that are detachably connected to each other and coaxially arranged, an oblong hole that matches the crankshaft journal is provided between the first connecting rod and the second connecting rod, the journal is vertically installed in the oblong hole, the first connecting rod is connected to the piston of the first cylinder, and the second connecting rod is connected to the piston of the second cylinder.

[0008] Preferably, the first connecting rod and the second connecting rod are both T-shaped structures, the first connecting rod and the second connecting rod are symmetrically arranged, one end of the T-shaped structure is connected to the piston, and the end away from the piston is provided with an arc profile, and the arc profiles of the first connecting rod and the second connecting rod enclose an oblong hole.

[0009] Preferably, a first alloy tile is provided in the arc-shaped contour of the first connecting rod, and a second alloy tile is provided in the arc-shaped contour of the second connecting rod. The first alloy tile and the second alloy tile are enclosed on the outside of the journal, and a journal sleeve is provided on the outside of the journal, and the journal sleeve abuts the first alloy tile or the second alloy tile.

[0010] Preferably, the axis of the crankshaft intersects the axial direction of the connecting rod structure and is perpendicular to the plane where the oblong hole is located, and the sum of the diameter of the journal center motion trajectory and the journal sleeve outer diameter is smaller than the length of the oblong hole.

[0011] Preferably, an elastic arc plate is provided in the oblong hole, and the elastic arc plate is coaxially arranged with the connecting rod assembly along the piston moving direction. When the journal passes through the connecting rod axis position, the two sides of the journal sleeve respectively abut against the elastic arc plate and the inner side of the oblong hole.

[0012] Preferably, a limit assembly is provided below the connecting rod assembly, and the limit assembly is used to limit the vertical displacement of the connecting rod assembly and balance the vertical force and eccentric moment applied to the connecting rod during movement.

[0013] Preferably, the limiting assembly includes a sliding plate and a support plate, the support plate is fixed on the engine body, and a guide rail is provided at one end close to the connecting rod assembly, the sliding plate is installed at the lower end of the connecting rod assembly, and a plurality of guide wheels are provided on the sliding plate, each guide wheel is symmetrically distributed and closely connected to both sides of the guide rail, and the outer peripheral surface of the guide wheel is transitionally fitted with the guide surface of the guide rail.

[0014] Preferably, a plurality of adjusting bolts and fixing bolts are provided on the support plate, the support plate is connected to the engine body via the fixing bolts, and the adjusting bolts are used to adjust the horizontality and height of the connecting rod assembly.

[0015] Preferably, the contact end surfaces of the first connecting rod and the second connecting rod are provided with positioning steps that cooperate with each other, and the first connecting rod and the second connecting rod are connected by bolts.

[0016] Preferably, the first cylinder, the second cylinder and the connecting rod assembly form a cylinder group, and the engine includes a plurality of cylinder groups, each cylinder group is distributed in parallel and connected through corresponding journals on the crankshaft.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) In this scheme, a group of cylinders, namely, a first cylinder and a second cylinder, are arranged horizontally opposite and coaxially, and the pistons of the first cylinder and the second cylinder are connected by a connecting rod assembly. The first connecting rod and the second connecting rod are arranged coaxially, and an oblong hole is provided at the connection. The journal rolls up and down in the oblong hole, and as the crankshaft rotates, the connecting rod assembly is driven to move when the cylinder is actuated, and then the crankshaft is driven to rotate through the journal, or the journal drives the connecting rod assembly to reciprocate linearly.

[0019] By arranging a coaxial first connecting rod and a second connecting rod between the two cylinders and arranging an oblong hole in the middle of the two, the crankshaft journal is installed in the oblong hole, so that the crankshaft can interact with the two cylinders of the coaxial connecting rod assembly. The coaxial connecting rod assembly and the oblong hole of the crankshaft have a simple structure, the crankshaft is better stressed, the output torque and efficiency of the cylinder connecting rod are improved, the machining accuracy of the parts is reduced, and the manufacturing and maintenance costs of the parts are reduced.

[0020] (2) This solution sets the first alloy tile and the second alloy tile on both sides of the inner wall of the oblong hole, and sets an elastic arc plate on one side of the oblong hole. When the direction of piston movement changes, the crankshaft journal is located in the middle of the oblong hole, so that one side of the journal sleeve on the outside of the journal abuts against the elastic arc plate, and the other side abuts against the alloy tile. It can ensure that when the journal changes contact between the first alloy tile and the second alloy tile, there will be no gap between the journal and the alloy tile, reducing the vibration and noise of the engine and making the engine run more smoothly. The use of alloy tiles and journal sleeves can avoid wear on the journal and the inner side of the oblong hole. The alloy tiles or journal sleeves are easy to replace, which is convenient for later maintenance and reduces costs. It can ensure the matching accuracy for a long time and extend the service life of the engine.

[0021] (3) This solution sets a limit assembly under the connecting rod assembly, which supports the connecting rod assembly vertically through the interactively connected support plate and sliding plate, thereby limiting the vertical displacement of the connecting rod assembly and balancing the vertical force and eccentric torque applied to the connecting rod assembly during movement. In addition, the adjusting bolts on the support plate are used to adjust the horizontality and height of the connecting rod assembly to ensure that the connecting rod assembly can be coaxially arranged with the cylinder piston, thereby reducing or avoiding eccentric wear and tear of the cylinder and effectively extending the service life of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a horizontally opposed engine with coaxially arranged connecting rods provided by the present invention;

[0023] Figure 2 A schematic diagram of the force position and direction of the journal of the crankshaft provided by the present invention;

[0024] In the figure: 1, connecting rod assembly, 2, crankshaft, 3, first cylinder, 4, second cylinder, 5, limit assembly, 11, first connecting rod, 12, second connecting rod, 13, oblong hole, 14, first alloy tile, 15, second alloy tile, 16, elastic arc plate, 21, journal, 22, journal sleeve, 51, sliding plate, 52, support plate, 53, guide rail, 54, guide wheel, 55, adjusting bolt. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides a horizontally opposed engine with a coaxial connecting rod arrangement, including a connecting rod assembly 1, a crankshaft 2, a first cylinder 3 and a second cylinder 4, the first cylinder 3 and the second cylinder 4 are horizontally coaxially opposed, the connecting rod assembly 1 includes a first connecting rod 11 and a second connecting rod 12 that are detachably connected to each other and coaxially arranged, an oblong hole 13 that matches the journal 21 of the crankshaft 2 is provided between the first connecting rod 11 and the second connecting rod 12, the journal 21 is installed in the oblong hole 13, the first connecting rod 11 is connected to the piston of the first cylinder 3, and the second connecting rod 12 is connected to the piston of the second cylinder 4.

[0033] Working principle: a group of cylinders, namely the first cylinder 3 and the second cylinder 4, are horizontally opposed and coaxially arranged, and the pistons of the first cylinder 3 and the second cylinder 4 are connected by a connecting rod assembly 1, and the first connecting rod 11 and the second connecting rod 12 are coaxially arranged, and an oblong hole 13 is provided at the connection, and the journal 21 rolls up and down in the oblong hole 13, and as the crankshaft 2 rotates, the connecting rod assembly 1 is driven to move horizontally left and right when the cylinder is actuated, and then the crankshaft 2 is driven to rotate through the journal 21, or the journal 21 drives the connecting rod assembly 1 to reciprocate linearly.

[0034] By arranging a coaxial first connecting rod 11 and a second connecting rod 12 between the two cylinders, and arranging an oblong hole 13 in the middle of the two, the journal 21 of the crankshaft 2 is installed in the oblong hole 13, so that the crankshaft 2 can interact with the two cylinders of the coaxial connecting rod assembly. The coaxial connecting rod assembly and the crankshaft-oblong hole 13 have a simple structure, the crankshaft is better stressed, the output torque and efficiency of the cylinder connecting rod are improved, the machining accuracy of the parts is reduced, and the manufacturing and maintenance costs of the parts are reduced.

[0035] like Figure 2 As shown, the journal center trajectory C is a circle with the center of the crankshaft as the center, one side of the journal 21 is always in contact with one side of the oblong hole 13 in the connecting rod assembly, and the trajectory B of the force point of the journal 21 is an envelope of variable diameter, and the horizontal movement of the connecting rod assembly keeps the direction A of the force between the connecting rod assembly and the journal 21 always horizontal, optimizing the force of the crankshaft. Under the same conditions, compared with the traditional crankshaft connecting rod structure, the output torque of the cylinder connecting rod is greater, which improves the output efficiency of the cylinder.

[0036] Specifically, the first connecting rod 11 and the second connecting rod 12 are both T-shaped structures, and the first connecting rod 11 and the second connecting rod 12 are symmetrically arranged. One end of the T-shaped structure is connected to the piston, and the end away from the piston is provided with an arc profile. The arc profiles of the first connecting rod 11 and the second connecting rod 12 enclose an oblong hole 13.

[0037] Among them, a first alloy tile 14 is provided in the arc-shaped contour of the first connecting rod 11, and a second alloy tile 15 is provided in the arc-shaped contour of the second connecting rod 12. The first alloy tile 14 and the second alloy tile 15 are enclosed on the outside of the journal 21, and a journal sleeve 22 is provided on the outside of the journal 21, and the journal sleeve 22 abuts against the first alloy tile 14 or the second alloy tile 15.

[0038] Furthermore, the axis of the crankshaft 2 intersects the axial direction of the connecting rod structure and is perpendicular to the plane where the oblong hole 13 is located, and the sum of the diameter of the center of the journal 21 and the outer diameter of the journal sleeve is less than the length of the oblong hole 13. The connecting rod assembly is formed by two symmetrically distributed T-shaped connecting rods, which facilitates the arrangement of an oblong hole perpendicular to the connecting rod direction between the two connecting rods, improves the coaxiality between the two connecting rods, and ensures the structural strength of the connecting rod at the oblong hole.

[0039] In a preferred embodiment, the width of the oblong hole is slightly larger than the outer diameter of the journal sleeve to facilitate single-sided contact and lubrication. An elastic arc plate is provided in the oblong hole, and the elastic arc plate is coaxially arranged with the connecting rod assembly, so that when the journal passes through the connecting rod axis position, the two sides of the journal abut against the elastic arc plate and the inner side of the oblong hole respectively, so as to achieve stable operation of the engine when the contact between the journal and the two side walls of the oblong hole changes.

[0040] Because there is a certain gap between the oblong hole surrounded by the alloy tiles and the shaft diameter, and as the alloy tiles wear, the gap increases. This results in a gap between the journal and the alloy tile on the other side when it rests against the alloy tile on one side. When the movement direction of the piston changes, the journal will sometimes contact the alloy tile on the other side, but the gap between them will cause the impact between the journal and the alloy tile to produce vibration and noise.

[0041] The first alloy tile and the second alloy tile are arranged on both sides of the inner wall of the oblong hole, and an elastic arc plate is arranged on one side of the oblong hole. When the piston movement direction changes, the crankshaft journal is located in the middle of the oblong hole, so that one side of the journal sleeve outside the journal abuts against the elastic arc plate, and the other side abuts against the alloy tile, which can ensure that when the journal contacts the first alloy tile and the second alloy tile, there will be no gap between the alloy tile, reducing the vibration and noise of the engine and making the engine run more smoothly. The use of alloy tiles and journal sleeves can reduce wear and are easy to replace, which is convenient for later maintenance and cost reduction, and is convenient for long-term guarantee of coordinated operation stability and extending the service life of the engine.

[0042] In a preferred embodiment, a limit assembly 5 is provided below the connecting rod assembly 1, and the limit assembly 5 is used to limit the vertical displacement of the connecting rod assembly 1 and balance the vertical force and eccentric moment applied to the connecting rod during movement.

[0043] Furthermore, the limit assembly 5 includes a sliding plate 51 and a support plate 52, the support plate 52 is fixed on the engine body, and a guide rail 53 is provided at one end close to the connecting rod assembly 1, the sliding plate 51 is installed at the lower end of the connecting rod assembly 1, and a plurality of guide wheels 54 are provided on the sliding plate 51, each guide wheel 54 is symmetrically distributed on both sides of the guide rail 53, and the outer peripheral surface of the guide wheel 54 is transitionally matched with the guide surface of the guide rail 53. In this embodiment, four guide wheels 54 are provided, so that the four guide wheels 54 are in compression contact with the guide rail 53, and the four guide wheels 54 are subjected to force during the movement process, thereby ensuring the stability of the movement of the connecting rod assembly.

[0044] Furthermore, a plurality of adjusting bolts 55 and fixing bolts are provided on the support plate 52 , and the support plate 52 is connected to the engine body via the fixing bolts. The adjusting bolts 55 are used to adjust the horizontality and height of the connecting rod assembly 1 .

[0045] Wherein, mutually matching positioning steps are provided on the contact end surfaces of the first connecting rod 11 and the second connecting rod 12, and the first connecting rod 11 and the second connecting rod 12 are connected by bolts.

[0046] A limit assembly is provided below the connecting rod assembly, which supports the connecting rod assembly vertically through interactively connected support plates and sliding plates, thereby limiting the vertical displacement of the connecting rod assembly, balancing the vertical force and eccentric torque applied to the connecting rod assembly during movement, and cooperating with the adjusting bolts on the support plate to adjust the horizontality and height of the connecting rod assembly to ensure that the connecting rod assembly can be coaxially arranged with the cylinder piston, thereby reducing or avoiding eccentric wear and tear of the cylinder and effectively extending the service life of the engine.

[0047] Optionally, the first cylinder, the second cylinder and the connecting rod assembly form a cylinder group, and the engine includes a plurality of cylinder groups, each cylinder group is distributed in parallel and connected through corresponding journals on the crankshaft.

[0048] The operating strokes of the four cylinders respectively connected to the connecting rod assembly provided in this embodiment are the same as the operating process of a traditional four-stroke engine. Each cycle of the engine includes the following four stages:

[0049] In the first stage, the cylinder corresponding to the piston of the first cylinder takes in air, the cylinder corresponding to the piston of the second cylinder exhausts air, the cylinder corresponding to the piston of the third cylinder ignites and burns, and the cylinder corresponding to the piston of the fourth cylinder compresses the mixed gas;

[0050] In the second stage, the cylinder corresponding to the piston of the first cylinder compresses the mixed gas, the cylinder corresponding to the piston of the second cylinder takes in air, the cylinder corresponding to the piston of the third cylinder exhausts air, and the cylinder corresponding to the piston of the fourth cylinder ignites and burns;

[0051] In the third stage, the cylinder corresponding to the piston of the first cylinder ignites and burns, the cylinder corresponding to the piston of the second cylinder compresses the mixed gas, the cylinder corresponding to the piston of the third cylinder takes in air, and the cylinder corresponding to the piston of the fourth cylinder exhausts air;

[0052] In the fourth stage, the cylinder corresponding to the piston of the first cylinder exhausts air, the cylinder corresponding to the piston of the second cylinder ignites and burns, the cylinder corresponding to the piston of the third cylinder compresses the mixture, and the cylinder corresponding to the piston of the fourth cylinder intakes air.

[0053] That is, the connecting rod assembly moves to the maximum limit at one end, the oil and gas mixture in the cylinder is ignited, the combustion gas expands and does work, pushing the piston to make the connecting rod assembly move toward the other end; the horizontal movement of the connecting rod assembly drives the journal to roll up and down along the oblong hole, and finally converts the horizontal movement of the piston-connecting rod into the rotation of the crankshaft, and then the power stroke is completed. At this time, the cylinder on the opposite side starts to ignite, pushing the connecting rod assembly toward the other end. At the same time, the exhaust valve of the cylinder on this side opens, entering the exhaust stroke, and then the second intake, mixture compression, power and exhaust strokes are carried out, and this cycle is repeated to achieve continuous rotation of the crankshaft.

[0054] The horizontally opposed engine in this embodiment is characterized in that the cylinders and connecting rods on both sides are coaxially arranged to form a basic unit, and engines with four cylinders, six cylinders, eight cylinders, etc. can be simply added on this basis. This simplifies the structural design and manufacturing of the multi-cylinder engine. Compared with other engines with the same number of cylinders, the axial dimension is greatly shortened, the force is better, the output torque and efficiency are higher, the vibration and noise are smaller, and the manufacturing and use costs are reduced.

[0055] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A horizontally opposed engine with coaxial connecting rod arrangement, comprising a connecting rod assembly (1), a crankshaft (2), a first cylinder (3) and a second cylinder (4), characterized in that: The first cylinder (3) and the second cylinder (4) are horizontally coaxially arranged opposite to each other, and the connecting rod assembly (1) includes a first connecting rod (11) and a second connecting rod (12) which are detachably connected to each other and coaxially arranged, and an oblong hole (13) matching with a journal (21) of a crankshaft (2) is provided between the first connecting rod (11) and the second connecting rod (12), and the journal (21) is vertically installed in the oblong hole (13), the first connecting rod (11) is connected to the piston of the first cylinder (3), and the second connecting rod (12) is connected to the piston of the second cylinder (4).

2. The horizontally opposed engine with coaxial connecting rod arrangement according to claim 1, characterized in that: The first connecting rod (11) and the second connecting rod (12) are both T-shaped structures. The first connecting rod (11) and the second connecting rod (12) are symmetrically arranged. One end of the T-shaped structure is connected to the piston, and the end away from the piston is provided with an arc profile. The arc profiles of the first connecting rod (11) and the second connecting rod (12) enclose an oblong hole (13).

3. The horizontally opposed engine with coaxial connecting rod arrangement according to claim 2, characterized in that: A first alloy tile (14) is provided in the arc-shaped contour of the first connecting rod (11), and a second alloy tile (15) is provided in the arc-shaped contour of the second connecting rod (12); the first alloy tile (14) and the second alloy tile (15) are enclosed on the outer side of a journal (21); a journal sleeve (22) is provided on the outer side of the journal (21), and the journal sleeve (22) abuts against the first alloy tile (14) or the second alloy tile (15).

4. The horizontally opposed engine with coaxial connecting rod arrangement according to claim 3, characterized in that: An elastic arc plate (16) is provided in the oblong hole (13), and the elastic arc plate (16) is coaxially arranged with the connecting rod assembly (1) along the moving direction of the piston. When the journal passes through the connecting rod axis position, the two sides of the journal sleeve (22) respectively abut against the elastic arc plate (16) and the inner side of the oblong hole (13).

5. The horizontally opposed engine with coaxial connecting rod arrangement according to claim 1, characterized in that: The axis of the crankshaft (2) intersects the axial direction of the connecting rod structure and is perpendicular to the plane where the oblong hole (13) is located, and the sum of the diameter of the center motion trajectory of the journal (21) and the outer diameter of the journal sleeve is smaller than the length of the oblong hole (13).

6. The horizontally opposed engine with coaxial connecting rod arrangement according to claim 1, characterized in that: A limit assembly (5) is provided below the connecting rod assembly (1), and the limit assembly (5) is used to limit the vertical displacement of the connecting rod assembly (1) and to balance the vertical force and eccentric moment applied to the connecting rod during movement.

7. The horizontally opposed engine with coaxial connecting rod arrangement according to claim 6, characterized in that: The limit assembly (5) comprises a sliding plate (51) and a supporting plate (52), wherein the supporting plate (52) is fixed on the engine body and is provided with a guide rail (53) at one end close to the connecting rod assembly (1), wherein the sliding plate (51) is mounted at the lower end of the connecting rod assembly (1), wherein a plurality of guide wheels (54) are provided on the sliding plate (51), wherein each guide wheel (54) is symmetrically distributed on both sides of the guide rail (53), and the outer peripheral surface of the guide wheel (54) is transitionally matched with the guide surface of the guide rail (53).

8. The horizontally opposed engine with coaxial connecting rod arrangement according to claim 7, characterized in that: The support plate (52) is provided with a plurality of adjusting bolts (55) and fixing bolts. The support plate (52) is connected to the engine body via the fixing bolts. The adjusting bolts (55) are used to adjust the horizontality and height of the connecting rod assembly (1).

9. The horizontally opposed engine with coaxial connecting rod arrangement according to claim 1, characterized in that: The contact end surfaces of the first connecting rod (11) and the second connecting rod (12) are provided with positioning steps that match each other, and the first connecting rod (11) and the second connecting rod (12) are connected by bolts.

10. The horizontally opposed engine with coaxial connecting rod arrangement according to claim 1, characterized in that: The first cylinder, the second cylinder and the connecting rod assembly form a cylinder group. The engine includes a plurality of cylinder groups, each cylinder group is distributed in parallel and connected through corresponding journals on the crankshaft.

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