A flat cavity double connecting rod elliptical piston internal combustion engine

Abstract

The utility model is a flat-chamber double-connecting rod elliptical piston internal combustion engine, which includes an elliptical piston, and a pair of connecting rod hinge seats are diagonally distributed on the bottom plane of the elliptical piston. Each connecting rod hinge seat is hinged to an eccentric wheel aligned therewith through a mechanical hinge group. Two eccentric wheels are eccentrically fixed to the same crankshaft, which is used to convert the reciprocating motion of the elliptical piston into the rotation of the crankshaft. The utility model realizes the compact arrangement of the eccentric wheels to achieve the compact effect of the whole machine flat-chamber through the structure that the connecting rod hinge seats of the two piston positions are not on the same axis and the connecting rod hinge seats are on the same axis as the corresponding crankshaft connecting rod, so that the piston is not easy to get stuck, and the miniaturized structure is easy to manufacture, test and promote.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting rod piston internal combustion engines and air compressors, in particular to a flat cavity type double connecting rod elliptical piston internal combustion engine. Background Art

[0002] Existing double-connecting rod piston internal combustion engines: air compressors or plunger hydraulic presses, as well as patent CN2014101823256 crankshaft connecting rod piston internal combustion engines with combustion chambers in the piston, which reduce the vibration and impact force of the piston on the eccentric wheel through multi-connecting rod conversion buffering, and the noise is also greatly reduced. The plunger in the piston solves the structural technical problem that the reciprocating impact force of the piston and the connecting rod is directly used for the compression stroke.

[0003] There are existing two-stroke internal combustion engines and four-stroke internal combustion engines: the four-stroke internal combustion engine can be designed as a two-stroke air compressor or a two-stroke plunger hydraulic press by adjusting the valve and exhaust valve sequence and eliminating the fuel system.

[0004] The existing oval piston was first introduced by British Triumph Motorcycle in 1920. It is Honda's outstanding work. The oval piston internal combustion engine of Honda NR750 motorcycle engine has a maximum speed of 25,000 revolutions per minute and a power-to-liter ratio of 300 kilowatts per liter.

[0005] However, among the above internal combustion engines, the double-connecting rod piston internal combustion engine is exemplified by the patent CN2014101823256, and the elliptical piston internal combustion engine is exemplified by the three models of Honda NR250--NR500--NR750 motorcycle engines. They currently still have the following disadvantages:

[0006] 1. The eccentric wheel of patent CN2014101823256 requires more than 3 sections, and the structural design is relatively large, making manufacturing, development and testing difficult;

[0007] 2. The elliptical piston internal combustion engine performed very well in competitions, but the piston easily got stuck and could not be mass-produced. Utility Model Content

[0008] The purpose of the utility model is to overcome the problems existing in the prior art and to provide a flat-cavity double-connecting rod elliptical piston internal combustion engine. By designing that the connecting rod hinge seats of the two piston positions are not on the same axis, the connecting rod hinge seats are on the same axis as the corresponding crankshaft connecting rods, so that the eccentric wheels are arranged compactly to achieve the compactness of the whole machine and realize the purpose of mechanical flat-cavity design.

[0009] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0010] A flat-chamber double-connecting rod elliptical piston internal combustion engine comprises an elliptical piston, a pair of connecting rod hinge seats are diagonally distributed on the bottom plane of the elliptical piston, each of the connecting rod hinge seats is hingedly connected to an eccentric wheel aligned therewith through a mechanical hinge group, and two of the eccentric wheels are eccentrically fixed to the same crankshaft for converting the reciprocating motion of the elliptical piston into rotation of the crankshaft.

[0011] Furthermore, the mechanical hinge group consists of a piston connecting rod, a guide connecting slider and a crankshaft connecting rod which are rotatably connected together in sequence, the outer end of the piston connecting rod is rotatably connected to the connecting rod hinge seat, and the outer end of the crankshaft connecting rod is rotatably connected to the eccentric wheel.

[0012] Furthermore, the internal combustion engine also includes an elliptical piston, a connecting rod hinge seat and a piston connecting rod of the same structure, which are arranged opposite to each other with the line connecting the rotating pairs between the two sets of crankshaft connecting rods and the guide connecting slider as the symmetry axis, and each pair of opposing piston connecting rods is rotationally connected to the same guide connecting slider through a rotating pair.

[0013] Furthermore, the upper, middle and lower ends of the guide connecting slider are respectively provided with connecting rod mounting seats, the upper and lower connecting rod mounting seats of the guide connecting slider are respectively rotatably connected to the opposite piston connecting rods, and the middle connecting rod mounting seat of the guide connecting slider is rotatably connected to the crankshaft connecting rod.

[0014] Furthermore, the guide connection slider is provided with a protruding slider or a concave sliding groove, and the guide connection slider is slidably connected to the slide rail through the slider or the sliding groove thereon, and the slide rail is fixed on the corresponding housing.

[0015] The beneficial effects of the utility model are:

[0016] The utility model realizes a compact arrangement of the eccentric wheels and a compact flat cavity effect of the whole machine by virtue of the structure that the connecting rod hinge seats at the two piston positions are not on the same axis and the connecting rod hinge seats are on the same axis as the corresponding crankshaft connecting rods. The piston is not easily stuck and the miniaturized structure is convenient for manufacturing, testing and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the opposed combined structure of the utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of the elliptical piston of the utility model from a partial front view;

[0019] Figure 3 This is a three-dimensional structural diagram of the elliptical piston bottom view of the utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the piston connecting rod of the utility model;

[0021] Figure 5This is a three-dimensional structural diagram of the guide connecting slider of the utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the crankshaft connecting rod of the utility model;

[0023] Figure 7 This is a structural diagram of the connection of the components in the mechanical hinge assembly of the utility model;

[0024] Figure 8 It is a three-dimensional structural diagram of the crankshaft and the eccentric wheel thereon of the utility model;

[0025] Fig. 9 This is a three-dimensional structural diagram of the slide rail of the utility model;

[0026] Fig.10 This is a three-dimensional structural diagram of the housing of the utility model;

[0027] Fig.11 This is a schematic diagram of the semi-assembled structure of the utility model;

[0028] Fig.12 This is a three-dimensional structural diagram of the utility model and the corresponding long tube cylinder body and oil circuit system assembly;

[0029] Fig.13 It is a cross-sectional view of the three-dimensional structure of the utility model assembled with the corresponding long tube cylinder body and oil circuit system;

[0030] Fig.14 It is a linear speed curve chart of the guide connection slider 4 and the elliptical piston 1 in each stroke of the utility model.

[0031] Explanation of the numbers in the figure: 1. elliptical piston, 2. connecting rod hinge seat, 3. piston connecting rod, 4. guide connecting slider, 41. connecting rod mounting seat, 42. slide groove, 5. crankshaft connecting rod, 6. eccentric wheel, 7. crankshaft, 8. slide rail, 9. housing, 10. long tube type cylinder body, 101. combustion chamber, 1011. exhaust port, 1012. first air inlet, 102. scavenging chamber, 1021. second air inlet, 11. flange part. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] like Figure 1 and Fig.11 As shown, a flat cavity double connecting rod elliptical piston internal combustion engine, the internal combustion engine comprises an elliptical piston 1, as shown in FIG. Figure 2 and Figure 3As shown, a pair of connecting rod hinge seats 2 are diagonally distributed on the bottom plane of the elliptical piston 1. In this embodiment, the connecting rod hinge seat 2 is a rotating joint seat, and one side wall of the two rotating joint seats respectively protrudes inwardly and extends in opposite directions, so that the rotating connection positions of the two rotating joint seats are diagonally distributed in the axial direction of the corresponding rotating pin, forming a staggered structure. Each of the connecting rod hinge seats 2 is hingedly connected to the eccentric wheel 6 aligned therewith through a mechanical hinge group, as shown in FIG. Figure 8 As shown, the two eccentric wheels 6 are eccentrically fixed to the same crankshaft 7 for converting the reciprocating motion of the elliptical piston 1 into the rotation of the crankshaft 7 .

[0034] like Figure 7 As shown, the mechanical hinge group consists of a piston connecting rod 3, a guide connecting slider 4 and a crankshaft connecting rod 5 which are rotatably connected together in sequence. The outer end of the piston connecting rod 3 is rotatably connected to the connecting rod hinge seat 2 through a rotating pair, and the outer end of the crankshaft connecting rod 5 is rotatably connected to the eccentric wheel 6.

[0035] like Figure 1 As shown, the internal combustion engine also includes an elliptical piston 1, a connecting rod hinge seat 2 and a piston connecting rod 3 of the same structure, which are arranged opposite to each other with the line connecting the rotating pairs between the two sets of crankshaft connecting rods 5 and the guide connecting slider 4 as the symmetry axis, and each pair of opposing piston connecting rods 4 is rotationally connected to the same guide connecting slider 4 through a rotating pair.

[0036] like Figure 5 As shown, the upper end, middle part and lower end of the guide connecting slider 4 are respectively provided with connecting rod mounting seats 41, the upper end and lower end connecting rod mounting seats 41 of the guide connecting slider 4 are respectively rotatably connected to the opposite piston connecting rod 4, and the middle connecting rod mounting seat 41 of the guide connecting slider 4 is rotatably connected to the crankshaft connecting rod 5. In this embodiment, as shown Figure 6 As shown, the crankshaft connecting rod 5 is integrally composed of a handle-like structure and an annular structure. The outer end of the handle-like structure of the crankshaft connecting rod 5 is rotatably connected to the connecting rod mounting seat 41 of the guide connecting slider 4, and the annular structure of the crankshaft connecting rod 5 is rotatably sleeved on the eccentric wheel 6.

[0037] The guide connection slider 4 is provided with a raised slider or a recessed slide groove 42 , and the guide connection slider 4 is slidably connected to the slide rail 8 via the slider or the slide groove 42 thereon, and the slide rail 8 is fixed on the corresponding housing 9 .

[0038] In this embodiment, the internal combustion engine further comprises a long tubular cylinder body 10 matching the shape of the elliptical piston 1, so that the elliptical piston 1 is located in the cylinder body 10 and forms a long tubular combustion chamber 101 between the elliptical piston 1 and the cylinder cavity.

[0039] In this embodiment, the elliptical piston 1 of the utility model is taken as an example when it works in a two-stroke scheme; Fig.13As shown, the bottom edge of the elliptical piston 1 is provided with an outwardly protruding flange portion 11, and the flange portion 11 cooperates with the cylinder cavity to form a scavenging chamber 102. A second air inlet 1021 is provided on one side end of the scavenging chamber 102 close to the combustion chamber 101 to communicate with the outside air. The flange portion 11 and the scavenging chamber 102 slide together to suck the outside air into the scavenging chamber 102 and then press it into the combustion chamber 101. An exhaust port 1011 is provided on one side end of the combustion chamber 101 located above the air inlet 1011, and a second exhaust port 1011 is provided on one side end of the combustion chamber 101 opposite to the exhaust port 1011. An air inlet 1012 is connected to the outside air; during operation, after the two-stroke explosion, the elliptical piston 1 first slides downward to the exhaust port 1011, ejects the high-temperature and high-pressure exhaust gas, and performs the first ventilation at the same time. Fresh air flows into the combustion chamber 101 from the first air inlet 1012 along the direction of the potential energy after the ejection. After that, when the elliptical piston 1 moves to the lowest stroke and starts to return, a scavenging action occurs in the scavenging chamber 102 through the flange 11, and the outside air is sucked into the scavenging chamber 102 through the second air inlet 1021 and then pressed into the combustion chamber 101; Fig.14 As shown, the curve chart of the linear speed of the guide connecting slider 4 and the linear speed of the elliptical piston 1 under each stroke is simulated by using Siemens NX motion simulation software when the rotation speed of the crankshaft 7 is fixed at a certain value. It can be seen from the curve chart that:

[0040] The velocity waveform of the elliptical piston 1 and the velocity waveform of the guide connecting slider 4 are obviously blunted near the dead point compared with the conventional piston internal combustion engine piston velocity waveform:

[0041] Waveform passivation advantage 1: The elliptical piston 1 passes through the bottom dead center smoothly, reducing vibration;

[0042] Advantage 2 of waveform passivation: When applied to air compressors, the elliptical piston 1 gets more time to compress the air through the top dead center, which has a good high-pressure cooling effect and reduces vibration, thus achieving the purpose of energy saving;

[0043] Advantage 3 of waveform passivation: When applied to an internal combustion engine, the elliptical piston 1 obtains more combustion time through ignition of compressed air at the top dead center, has a good combustion effect, reduces vibration, increases effective power, and saves fuel.

[0044] In addition, the rest of the existing mature internal combustion engine structure can continue to be used in the structure of the internal combustion engine scheme of the utility model, which is common sense. The closest one is patent CN2014101823256, and the structures that can be used are as follows: 1. Cooling system; 2. Lubrication system and high-pressure liquid oil lubrication system and oil supply and return lines, and corresponding oil cooling system; 3. Fuel injection system; 4. Air supply and exhaust system; 5. Cylinder head assembly system; 6. Valve opening and closing system; 7. Oil and gas mixed ignition and combustion system; 8. Structure of piston reciprocating guide function; 9. Structural technology that is conducive to maintenance and repair, lifting process holes and other structures and reasonable positions; 10. Bearing bushings and installation hinged structure technology; 11. Crankshaft flywheel system and body shell installation hinged structure technology; 12. Anti-vibration damper governor structure technology.

[0045] In addition, it should be noted that, unless otherwise specified or indicated, the terms "first", "second", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A flat cavity double connecting rod elliptical piston internal combustion engine, characterized in that: The internal combustion engine comprises an elliptical piston (1), a pair of connecting rod hinge seats (2) are diagonally distributed on the bottom plane of the elliptical piston (1), each of the connecting rod hinge seats (2) is hingedly connected to an eccentric wheel (6) aligned therewith via a mechanical hinge group, and the two eccentric wheels (6) are eccentrically fixed to the same crankshaft (7) for converting the reciprocating motion of the elliptical piston (1) into the rotation of the crankshaft (7).

2. The flat-chamber double-connecting-rod elliptical piston internal combustion engine according to claim 1, characterized in that: The mechanical hinge assembly consists of a piston connecting rod (3), a guide connecting slider (4) and a crankshaft connecting rod (5) which are rotatably connected together in sequence. The outer end of the piston connecting rod (3) is rotatably connected to a connecting rod hinge seat (2), and the outer end of the crankshaft connecting rod (5) is rotatably connected to an eccentric wheel (6).

3. The flat-chamber double-connecting-rod elliptical piston internal combustion engine according to claim 2, characterized in that: The internal combustion engine also comprises an elliptical piston (1), a connecting rod hinge seat (2) and a piston connecting rod (3) of the same structure, which are arranged oppositely with the connecting line of the rotating pair between two groups of crankshaft connecting rods (5) and the guide connecting slider (4) as the symmetry axis, and each pair of opposite piston connecting rods (3) is rotationally connected to the same guide connecting slider (4) through the rotating pair.

4. The flat-chamber double-connecting rod elliptical piston internal combustion engine according to claim 3, characterized in that: The upper end, middle part and lower end of the guide connecting slider (4) are respectively provided with connecting rod mounting seats (41); the upper end and lower end connecting rod mounting seats (41) of the guide connecting slider (4) are respectively rotatably connected to the opposite piston connecting rods (3); the middle connecting rod mounting seat (41) of the guide connecting slider (4) is rotatably connected to the crankshaft connecting rod (5).

5. The flat-chamber double-connecting-rod elliptical piston internal combustion engine according to claim 4, characterized in that: The guide connection slider (4) is provided with a protruding slider or a concave sliding groove (42), and the guide connection slider (4) is slidably connected to the slide rail (8) via the slider or the sliding groove (42) thereon, and the slide rail (8) is fixed on the corresponding housing (9).

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