Internal combustion engine

Abstract

The utility model provides an internal combustion engine which can restrain vortexes causing uneven flowing in a cylinder and can restrain knocking in the cylinder. An internal combustion engine includes: a cylinder block; a cylinder head; a combustion chamber is formed among the cylinder body, the cylinder cover and the piston, the cylinder cover is provided with an air inlet, an exhaust port, a pair of air inlet valves, a pair of exhaust valves, a spark plug and a fuel injection valve, the air inlet is used for generating tumble flow, the spark plug is located in the center of the cylinder cover, and the fuel injection valve is located between the air inlet valves. The top of the piston is located between the air inlet and the air outlet and provided with a top face, the top face is bent at a constant first curvature radius in the whole radial length of the top of the piston, the top of the piston is provided with a piston plane, and the position of the piston plane corresponds to the air inlet valve and the air outlet valve. The cylinder head plane is located between the pair of intake valves and the pair of exhaust valves, and when the piston is located at the top dead center, an air extrusion area is formed between the piston plane and the cylinder head plane.

Description

Technical Field

[0001] The utility model relates to a vehicle device, and in particular to an internal combustion engine. Background Art

[0002] In recent years, research and development efforts focused on improving fuel efficiency, which contributes to energy efficiency, have been underway to ensure access to affordable, reliable, sustainable, and advanced energy for a wider audience. However, large-bore engines in vehicles are prone to internal combustion engine improvements, which can cause flow deviations within the cylinders, leading to turbulence and swirl. This can hinder combustion from reaching the cylinder exhaust port, leading to knock and preventing rapid combustion. This necessitates improvements to internal combustion engines to overcome these issues. Utility Model Content

[0003] The utility model provides an internal combustion engine, which can suppress eddy currents that cause uneven flow in a cylinder and can suppress the occurrence of knock in the cylinder.

[0004] The utility model provides an internal combustion engine, comprising: a cylinder block; a cylinder head covering the cylinder block; and a piston reciprocatingly arranged in the cylinder block, wherein a combustion chamber is formed between the cylinder block, the cylinder head and the piston, and the cylinder head is provided with an intake port, an exhaust port, a pair of intake valves, a pair of exhaust valves, a spark plug and a fuel injection valve, wherein the intake port is used to generate a tumble flow, the pair of intake valves are used to open and close the intake port, and the pair of exhaust valves are used to open and close the exhaust port, the spark plug is located in the center of the cylinder head, and the fuel injection valve is located between the pair of intake valves. The piston top of the piston is used to contact the tumble flow, the piston top is located between the intake port and the exhaust port and has a top surface, the top surface is curved with a constant first curvature radius over the entire radial length of the piston top along the first direction, the piston top has a piston plane, the position of the piston plane corresponds to the intake valve and the exhaust valve, the cylinder head has a cylinder head plane, the cylinder head plane is located between the pair of intake valves and between the pair of exhaust valves, when the piston is at the top dead center, an air compression area is formed between the piston plane and the cylinder head plane.

[0005] In an embodiment of the present invention, the top surface is curved with a second curvature radius along a second direction perpendicular to the first direction, and the first curvature radius is greater than the second curvature radius.

[0006] In an embodiment of the present invention, the area of ​​the piston plane corresponding to the intake valve is larger than the area of ​​the piston plane corresponding to the exhaust valve.

[0007] Based on the above, in the internal combustion engine of the present invention, the top surface of the shallow-bottomed piston crown is curved with a constant radius of curvature throughout its entire radial length. Furthermore, air compression zones are formed between the piston at top dead center and the cylinder head on both the intake and exhaust sides. This effectively maintains vertical tumble flow in the combustion chamber and improves air flow within the cylinder, dispersing the location of knock on the exhaust side. Consequently, the internal combustion engine of the present invention suppresses eddy currents that can cause uneven flow within the cylinder and prevents the occurrence of knock within the cylinder.

[0008] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram of an internal combustion engine according to an embodiment of the present invention;

[0010] Figure 2 Show Figure 1 The local structure of the internal combustion engine;

[0011] Figure 3 yes Figure 2 Bottom view of the cylinder head;

[0012] Figure 4 yes Figure 2 A three-dimensional view of the piston top;

[0013] Figure 5 yes Figure 4 A top view of the piston top;

[0014] Figure 6 yes Figure 5 A cross-sectional view of the piston top along line II;

[0015] Figure 7 yes Figure 2 A three-dimensional view of the piston top;

[0016] Figure 8 yes Figure 5 A cross-sectional view of the piston top along line II-II;

[0017] Figure 9A yes Figure 2 A bottom schematic diagram of an internal combustion engine;

[0018] Figure 9B yes Figure 2 A schematic front view of an internal combustion engine;

[0019] Figure 9C yes Figure 2 Schematic side view of an internal combustion engine.

[0020] Description of reference numerals:

[0021] 100: Internal combustion engine;

[0022] 110: cylinder block;

[0023] 110a: cylinder hole;

[0024] 110b: seat surface;

[0025] 120: cylinder head;

[0026] 120a: air inlet;

[0027] 120b: exhaust port;

[0028] 120c: cylinder head plane;

[0029] 121a, 121b: valve seat;

[0030] 130: piston;

[0031] 1301: piston top;

[0032] 1301a: top surface;

[0033] 1301b: piston plane;

[0034] 140: combustion chamber;

[0035] 150: crankshaft;

[0036] 160: connecting rod;

[0037] 170a: intake valve;

[0038] 170b: exhaust valve;

[0039] 180: Spark plug;

[0040] 180a: electrode;

[0041] 190: fuel injection valve;

[0042] 190a: injection port;

[0043] C: cylinder axis;

[0044] D1: first direction;

[0045] D2: second direction;

[0046] F: tumble flow;

[0047] Rx: rotation axis. DETAILED DESCRIPTION

[0048] Figure 1This is a schematic diagram of an internal combustion engine according to an embodiment of the present invention. Figure 1 The internal combustion engine 100 of this embodiment includes a cylinder block 110, a cylinder head 120, and a piston 130. The cylinder block 110 has a cylinder bore 110a, a cylindrical space coaxial with the cylinder axis C. The cylinder head 120 is connected to the upper end of the cylinder block 110 and covers the cylinder block 110. The piston 130 is reciprocatingly disposed within the cylinder block 110 and is capable of reciprocating within the cylinder bore 110a along the cylinder axis C. The piston 130 has a piston crown 1301 facing the cylinder head 120. A sloping-roof combustion chamber 140 is formed between the cylinder block 110, the cylinder head 120, and the piston 130. The cylinder block 110 has a seat surface 110b for receiving the cylinder head 120. The opening of the cylinder bore 110a is surrounded by the seat surface 110b. The seat surface 110b extends in a plane perpendicular to the cylinder axis C.

[0049] Crankshaft 150, supported by a crankcase, is rotatably connected to piston 130 about a rotation axis Rx. Connecting rod 160 connects piston 130 to a crankpin of crankshaft 150. Connecting rod 160 converts linear motion of piston 130 into rotational motion of crankshaft 150.

[0050] Figure 2 Show Figure 1 1 shows a partial structure of an internal combustion engine, which shows a state where the piston is at the top dead center, that is, the piston has moved to the limit position in the direction toward the cylinder head. Figure 3 yes Figure 2 Bottom view of the cylinder head. Figure 2 and Figure 3 The cylinder head 120 is provided with a pair of intake ports 120a and a pair of exhaust ports 120b arranged side by side. The intake ports 120a are used to generate tumble flow. Specifically, the intake ports 120a are formed in the combustion chamber 140 (shown in FIG. Figure 1 ) to generate a forward tumble flow. Valve seats 121a and 121b of intake port 120a and 120b are fixed to the openings of intake port 120a and exhaust port 120b, respectively. Piston top 1301 is located between intake port 120a and exhaust port 120b and is configured to contact the tumble flow.

[0051] The cylinder head 120 is also provided with an intake valve 170a and an exhaust valve 170b. The intake valve 170a is supported by the cylinder head 120 so as to be freely displaceable in the axial direction and opens and closes the opening of the intake port 120a facing the combustion chamber 140. The exhaust valve 170b is supported by the cylinder head 120 so as to be freely displaceable in the axial direction and opens and closes the opening of the exhaust port 120b facing the combustion chamber 140. When the intake port 120a and the exhaust port 120b are closed, the intake valve 170a and the exhaust valve 170b are seated on valve seats 121a and 121b, respectively. The intake valve 170a and the exhaust valve 170b are operated by components such as a camshaft and a connecting rod supported by the cylinder head 120. Their detailed configuration and operation are well known in the art and will not be described in detail here.

[0052] Cylinder head 120 is also equipped with a spark plug 180 and a fuel injection valve 190. Fuel injection valve 190 is located between the pair of intake valves 170a. Fuel injection valve 190 has an injection port 190a facing the combustion chamber 140 and injects fuel into the forward tumble flow formed in the combustion chamber 140 to generate an air-fuel mixture. Spark plug 180 is located in the center of cylinder head 120 and has an electrode 180a. Spark plug 180 ignites the air-fuel mixture, causing combustion in the combustion chamber 140.

[0053] Figure 4 yes Figure 2 A three-dimensional view of the piston top. Figure 5 yes Figure 4 Top view of the piston top. Figure 6 yes Figure 5 The cross-sectional view of the piston top along line II. Please refer to Figures 4 to 6 The piston top 1301 has a top surface 1301a, which is curved at a constant first curvature radius along the entire radial length of the piston top 1301 in the first direction D1, so as to effectively maintain the vertical tumble flow in the combustion chamber 140, thereby suppressing the vortex that causes uneven flow in the cylinder. In addition, the piston top 1301 has a piston plane 1301b, and the position of the piston plane 1301b corresponds to the position of the intake valve 170a (shown in FIG. Figure 2 ) and exhaust valve 170b (shown in Figure 2 ). Also, the cylinder head 120 is as shown Figure 3 The cylinder head plane 120c is shown as having a cylinder head plane 120c, which is located between a pair of intake valves 170a and between a pair of exhaust valves 170b. Figure 2 As shown in the state, an air squeezing area is formed between the piston plane 1301b and the cylinder head plane 120c, which improves the air flow in the cylinder to disperse the detonation location on the exhaust side, thereby suppressing the occurrence of detonation in the cylinder.

[0054] Figure 7 yes Figure 2 A three-dimensional view of the piston top. Figure 8 yes Figure 5 The cross-sectional view of the piston top along the II-II line. Please refer to Figure 7 and Figure 8 In this embodiment, the top surface 1301a of the piston top 1301 is curved with a second curvature radius along a second direction D2 perpendicular to the first direction D1. Figure 6 and Figure 8 It can be seen that Figure 6 The first curvature radius of the top surface 1301a along the first direction D1 is larger than Figure 8 The second curvature radius of the top surface 1301a along the second direction D2 is shown. Accordingly, due to the larger curvature radius in the first direction D1, the undulation of the top surface 1301a is not too large, so the tumble flow can be maintained and the generation of eddy current can be suppressed.

[0055] Figure 9A yes Figure 2 Schematic diagram of an internal combustion engine from below. Figure 9B yes Figure 2 Schematic diagram of the front view of an internal combustion engine. Figure 9C yes Figure 2 A side view of an internal combustion engine. Figure 9A 、 Figure 9B and Figure 9C As shown, this embodiment smoothly maintains the tumble flow F in the combustion chamber 140 through the above structural design. Specifically, after the air enters the combustion chamber 140 from the intake port 120a, it becomes the tumble flow F and impacts the piston top 1301 (marked at Figure 4 ), the piston top 1301 has a shallow disc-shaped top surface 1301a with small undulations as mentioned above, so as to effectively maintain the tumble flow and suppress the generation of vortex.

[0056] In addition, in this embodiment, the piston plane 1301b ( Figure 7 The area of ​​the piston plane 1301b on the right side of the exhaust valve 170b is larger than the piston plane 1301b ( Figure 7 Thus, the air squeeze on the exhaust side before the piston 130 moves to the top dead center can be suppressed, thereby suppressing the generation of vortex to further improve the air flow in the cylinder.

[0057] In summary, in the internal combustion engine of the present invention, the top surface of the shallow-bottomed piston crown is curved with a constant radius of curvature throughout its entire radial length. Furthermore, air compression zones are formed between the piston at top dead center and the cylinder head on both the intake and exhaust sides. This effectively maintains vertical tumble flow in the combustion chamber and improves air flow within the cylinder, dispersing the location of knock on the exhaust side. Consequently, the internal combustion engine of the present invention suppresses eddy currents that can cause uneven flow within the cylinder and mitigates the occurrence of knock within the cylinder.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An internal combustion engine, characterized in that include: cylinder block; a cylinder head covering the cylinder block; as well as The piston is reciprocatingly disposed in the cylinder body. The cylinder body, the cylinder head and the piston form a combustion chamber. The cylinder head is provided with an intake port, an exhaust port, a pair of intake valves, a pair of exhaust valves, a spark plug and a fuel injection valve. The intake port is used to generate tumble flow, the pair of intake valves are used to open and close the intake port, and the pair of exhaust valves are used to open and close the exhaust port. The spark plug is located in the center of the cylinder head, and the fuel injection valve is located between the pair of intake valves. The piston top of the piston is used to contact the tumble flow, The piston top is located between the intake port and the exhaust port and has a top surface, wherein the top surface is curved with a constant first curvature radius over the entire radial length of the piston top in the first direction. The top of the piston has a piston plane, and the position of the piston plane corresponds to the intake valve and the exhaust valve. The cylinder head has a cylinder head plane, and the cylinder head plane is located between the pair of intake valves and between the pair of exhaust valves. When the piston is located at the top dead center, an air squeezing area is formed between the piston plane and the cylinder head plane.

2. The internal combustion engine according to claim 1, characterized in that The top surface is curved with a second curvature radius along a second direction perpendicular to the first direction, The first radius of curvature is greater than the second radius of curvature.

3. The internal combustion engine according to claim 2, characterized in that An area of ​​the piston plane corresponding to the intake valve is larger than an area of ​​the piston plane corresponding to the exhaust valve.

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