Engine combustion system

Abstract

The invention provides an engine combustion system. The engine combustion system comprises a cylinder body; the first piston is movably mounted in the cylinder body, and a first pit is formed in the end, extending in the axial direction, of the first piston; the second piston is movably mounted in the cylinder body and is opposite to the first piston, a second pit is formed in the end, facing the first pit, of the second piston, and a combustion chamber is defined by the first pit, the second pit and the cylinder body; the fuel injector is installed on the cylinder body and suitable for injecting fuel towards the interior of the combustion chamber; the first pit is configured to guide fuel to flow towards the inner wall, close to one side of the fuel injector, of the combustion chamber under the condition that the first piston is attached to the second piston; the second pit is constructed to guide fuel to flow towards the inner wall of the side, close to the fuel injector, of the combustion chamber and flow towards the inner wall of the side, facing the fuel injector, of the combustion chamber under the condition that the first piston is attached to the second piston, so that the fuel is evenly dispersed in the combustion chamber.

Description

Technical Field

[0001] At least one embodiment of the present invention relates to the technical field of internal combustion engines, and in particular to an engine combustion system. Background Art

[0002] The two pistons of the opposed-piston engine combustion system are symmetrically distributed on both sides of the crankshaft and move toward or away from each other in the horizontal direction, which is better balanced. The overall height of the engine combustion system is low and the length is short. When installed on the vehicle, the center of gravity of the vehicle is lowered, and the vehicle runs more smoothly. During the operation of the engine combustion system, the torques generated by the two pistons on both sides offset each other, greatly reducing the vibration of the vehicle during driving.

[0003] However, existing opposed-piston engines mainly use a spatially symmetrical combined combustion chamber, that is, the contours of the fuel-containing areas of the intake and exhaust side pistons are basically the same. Limited by the structural form of the opposed piston arrangement, the injector can only be arranged along the radial direction of the cylinder, resulting in an increase in the spray diffusion and mixing distance in the combustion chamber, low air utilization, and uneven oil-gas mixture distribution, resulting in poor combustion performance. Summary of the invention

[0004] In view of this, the present invention provides an engine combustion system, which enables the fuel injected into the combustion chamber through the injector to be evenly dispersed in the combustion chamber.

[0005] According to an embodiment of the present invention, an engine combustion system is provided, comprising: a cylinder body; a first piston movably mounted inside the cylinder body, a first recess being formed at one end of the first piston extending in an axial direction; a second piston movably mounted inside the cylinder body, facing the first piston, a second recess being formed at one end of the second piston facing the first recess, the first recess, the second recess and the cylinder body forming a combustion chamber; and an injector mounted on the cylinder body, adapted to inject fuel toward the inside of the combustion chamber; wherein the first recess is configured to guide the fuel to flow toward the inner wall of the combustion chamber close to the injector when the first piston and the second piston are in contact; and the second recess is configured to guide the fuel to flow toward the inner wall of the combustion chamber close to the injector and toward the inner wall of the combustion chamber facing the injector when the first piston and the second piston are in contact, so that the fuel is evenly dispersed inside the combustion chamber.

[0006] According to an embodiment of the present invention, the inner wall of the first pit facing the fuel injector includes a first oil guide section, a second oil guide section and a third oil guide section which are smoothly connected in sequence, the first oil guide section and the third oil guide section are both recessed toward the side away from the fuel injector, and the second oil guide section is convex toward the side facing the fuel injector, so that after the fuel sprayed by the fuel injector hits the second oil guide section, it flows along the first oil guide section and the third oil guide section toward the inner wall of the first pit close to the fuel injector.

[0007] According to an embodiment of the present invention, the first oil guiding section, the second oil guiding section and the third oil guiding section are all configured to be substantially arc-shaped.

[0008] According to an embodiment of the present invention, the projection of the middle part of the arc of the second oil guiding section in the axial direction falls on the radial connecting line of the cross section of the first piston, and the first oil guiding section and the third oil guiding section are symmetrically arranged with respect to the second oil guiding section.

[0009] According to an embodiment of the present invention, the inner wall of the first pit on the side close to the fuel injector is configured to be substantially arc-shaped, and both ends are smoothly connected to the first oil guide section and the third oil guide section respectively.

[0010] According to an embodiment of the present invention, the inner wall of the second pit facing the fuel injector comprises a fourth oil guide segment, a fifth oil guide segment and a sixth oil guide segment which are smoothly connected in sequence, the fourth oil guide segment and the sixth oil guide segment both protrude toward the side facing the fuel injector, and the fifth oil guide segment is recessed toward the side away from the fuel injector, so that after the fuel sprayed from the fuel injector hits the fourth oil guide segment or the sixth oil guide segment, it flows along the fourth oil guide segment or the sixth oil guide segment toward the inner wall of the second pit on the side close to the fuel injector and the fifth oil guide segment respectively.

[0011] According to an embodiment of the present invention, the fourth oil guiding section, the fifth oil guiding section and the sixth oil guiding section are all configured to be substantially arc-shaped.

[0012] According to an embodiment of the present invention, the projection of the middle part of the arc of the fifth oil guiding section in the axial direction falls on the radial connecting line of the cross section of the second piston, and the fourth guide section and the sixth guide section are symmetrically arranged with respect to the fifth guide section.

[0013] According to an embodiment of the present invention, the inner wall of the second recess on the side close to the fuel injector is configured to be substantially arc-shaped, and both ends are smoothly connected to the fourth oil guide section and the sixth oil guide section respectively.

[0014] According to an embodiment of the present invention, mutually matching notches are formed on the first pit and the second pit, respectively, which are suitable for guiding the fuel sprayed by the injector to be sprayed into the first pit and the second pit when the first piston is in contact with the second piston.

[0015] According to the engine combustion system of the above embodiment of the present invention, a first pit is formed at one end of the first piston extending in the axial direction, a second pit is formed at one end of the second piston facing the first pit, and the first pit, the second pit and the cylinder body form a combustion chamber. The first pit is configured to guide the fuel to flow toward the inner wall of the combustion chamber close to the injector when the first piston fits with the second piston, and the second pit is configured to guide the fuel to flow toward the inner wall of the combustion chamber close to the injector and toward the inner wall of the combustion chamber facing the injector when the first piston fits with the second piston, so that the fuel is evenly dispersed inside the combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional view of an engine combustion system according to an embodiment of the present invention;

[0017] Figure 2 is a three-dimensional schematic diagram of an injector of an engine combustion system according to an embodiment of the present invention spraying oil into the interior of a first piston;

[0018] Figure 3 is a three-dimensional schematic diagram of an injector of an engine combustion system according to an embodiment of the present invention spraying oil into the interior of a second piston;

[0019] Figure 4 is a schematic diagram of an oil circuit for an injector of an engine combustion system according to an embodiment of the present invention to inject oil into the interior of a first piston; and

[0020] Figure 5 It is a schematic diagram of an oil circuit for the injector of the engine combustion system according to an embodiment of the present invention to spray oil into the interior of the second piston.

[0021] In the figure:

[0022] 1- cylinder body;

[0023] 2-first piston; 21-first pit; 211-first oil guide section; 212-second oil guide section; 213-third oil guide section; 214-notch;

[0024] 3-second piston; 31-second recess; 311-fourth oil guide section; 312-fifth oil guide section; 313-sixth oil guide section;

[0025] 4- Combustion chamber;

[0026] 5 - injector; 51 - middle oil beam; 52 - outer oil beam. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0028] According to the inventive concept of one aspect of the present invention, an engine combustion system is provided, comprising: a cylinder body; a first piston movably mounted inside the cylinder body, a first recess being formed at one end of the first piston extending in an axial direction; a second piston movably mounted inside the cylinder body, facing the first piston, a second recess being formed at one end of the second piston facing the first recess, the first recess, the second recess and the cylinder body forming a combustion chamber; and an injector mounted on the cylinder body, suitable for injecting fuel toward the inside of the combustion chamber; wherein the first recess is configured to guide the fuel to flow toward the inner wall of the combustion chamber close to the injector side when the first piston and the second piston are in contact; and the second recess is configured to guide the fuel to flow toward the inner wall of the combustion chamber close to the injector side and toward the inner wall of the combustion chamber facing the injector side when the first piston and the second piston are in contact, respectively, so that the fuel is evenly dispersed inside the combustion chamber.

[0029] Figure 1 is a cross-sectional view of an engine combustion system according to an embodiment of the present invention; Figure 2 is a three-dimensional schematic diagram of an injector of an engine combustion system according to an embodiment of the present invention spraying oil into the interior of a first piston; Figure 3 It is a three-dimensional schematic diagram of the fuel injector of the engine combustion system according to the embodiment of the present invention spraying fuel into the interior of the second piston.

[0030] According to an exemplary embodiment of the present invention, please refer to Figure 1-Figure 3 , an engine combustion system is provided, comprising a cylinder 1, a first piston 2, a second piston 3 and an injector 5. The first piston 2 is movably mounted inside the cylinder 1, and a first recess 21 is formed at one end of the first piston 2 extending in the axial direction. The second piston 3 is movably mounted inside the cylinder 1, and is arranged to face the first piston 2, and a second recess 31 is formed at one end of the second piston 3 facing the first recess 21. The first recess 21, the second recess 31 and the cylinder 1 form a combustion chamber 4. The injector 5 is mounted on the cylinder 1, and is suitable for injecting fuel toward the inside of the combustion chamber 4. The first recess 21 is configured to guide the fuel to flow toward the inner wall 41 of the combustion chamber 4 close to the injector 5 when the first piston 2 and the second piston 3 are in contact. The second recess 31 is configured to guide the fuel to flow toward the inner wall of the combustion chamber 4 close to the injector 5 and toward the inner wall of the combustion chamber 4 facing the injector 5 when the first piston 2 and the second piston 3 are in contact, so that the fuel is evenly dispersed inside the combustion chamber 4.

[0031] In this embodiment, a first recess 21 is formed at one end of the first piston 2 extending in the axial direction, a second recess 31 is formed at one end of the second piston 3 facing the first recess 21, and the first recess 21, the second recess 31 and the cylinder body 1 form a combustion chamber 4. The first recess 21 is configured to guide the fuel to flow toward the inner wall of the combustion chamber 4 close to the fuel injector 5 when the first piston 2 and the second piston 3 are in contact with each other, and the second recess 31 is configured to guide the fuel to flow toward the inner wall of the combustion chamber 4 close to the fuel injector 5 and toward the inner wall of the combustion chamber 4 facing the fuel injector 5 when the first piston 2 and the second piston 3 are in contact with each other, so that the fuel is evenly dispersed inside the combustion chamber 4.

[0032] Figure 4 It is a schematic diagram of an oil circuit for an injector of an engine combustion system according to an embodiment of the present invention to spray oil into the interior of a first piston.

[0033] In some exemplary embodiments, referring to Figure 4 The inner wall of the first concave pit 21 facing the fuel injector 5 includes a first fuel guide section 211, a second fuel guide section 212, and a third fuel guide section 213 which are smoothly connected in sequence. The first fuel guide section 211 and the third fuel guide section 213 are both recessed toward the side away from the fuel injector 5, and the second fuel guide section 212 is convex toward the side facing the fuel injector 5, so that after the fuel sprayed from the fuel injector 5 hits the second fuel guide section 212, it flows along the first fuel guide section 211 and the third fuel guide section 213 toward the inner wall of the first concave pit 21 close to the fuel injector 5.

[0034] In this embodiment, after the fuel sprayed by the fuel injector 5 hits the second fuel guide section 212, it flows along the first fuel guide section 211 and the third fuel guide section 213 toward the inner wall of the first pit 21 close to the fuel injector 5. Figure 4 The arrows A and B in the middle show the flow direction of the fuel inside the first cavity 21 , so that the fuel fills the first cavity 21 on the side close to the injector 5 .

[0035] In some exemplary embodiments, referring to Figure 4 The first oil guiding section 211, the second oil guiding section 212 and the third oil guiding section 213 are all configured to be approximately arc-shaped.

[0036] Through the above arrangement, the fuel is guided to flow along the first oil guiding section 211 , the second oil guiding section 212 and the third oil guiding section 213 , respectively, so that the fuel flows smoothly through the first oil guiding section 211 , the second oil guiding section 212 and the third oil guiding section 213 .

[0037] In some exemplary embodiments, referring to Figure 4The projection of the middle part of the arc of the second oil guiding section 212 in the axial direction falls on the radial connecting line of the cross section of the first piston 2 , and the first oil guiding section 211 and the third oil guiding section 213 are symmetrically arranged with respect to the second oil guiding section 212 .

[0038] In this embodiment, the second oil guide section 212 is arranged so that the projection of the middle of the arc of the second oil guide section 212 in the axial direction falls on the radial connecting line of the cross section of the first piston 2, and the first oil guide section 211 and the third oil guide section 213 are symmetrically arranged about the second oil guide section 212, so as to guide the oil beam 51 in the middle sprayed by the injector 5 to flow toward the inner wall of the first recess 21 close to the injector 5, as shown in FIG. Figure 4 As shown by arrows A and B.

[0039] In other words, when the first piston 2 and the second piston 3 are in contact with each other, the middle parts of the arc of the injector 5 and the second oil guide section 212 face each other, so that the oil beam 51 located in the middle part sprayed by the injector 5 hits the second oil guide section 212, and then flows along the first oil guide section 211 or the third oil guide section 213 toward the inner wall of the first pit 21 close to the injector 5 side.

[0040] In some exemplary embodiments, referring to Figure 4 The inner wall of the first recess 21 close to the fuel injector 5 is configured to be roughly arc-shaped, and the two ends are smoothly connected to the first oil guide section 211 and the third oil guide section 213 respectively.

[0041] Through the above arrangement, the fuel can flow smoothly between the first oil guide section 211 and the side of the first pit 21 close to the injector 5, or between the third oil guide section 213 and the side of the first pit 21 close to the injector 5.

[0042] Figure 5 It is a schematic diagram of an oil circuit for the injector of the engine combustion system according to an embodiment of the present invention to spray oil into the interior of the second piston.

[0043] In some exemplary embodiments, referring to Figure 5 The inner wall of the second concave pit 31 facing the fuel injector 5 includes a fourth fuel guide section 311, a fifth fuel guide section 312 and a sixth fuel guide section 313 which are smoothly connected in sequence. The fourth fuel guide section 311 and the sixth fuel guide section 313 are both convex toward the side facing the fuel injector 5, and the fifth fuel guide section 312 is concave toward the side away from the fuel injector 5, so that after the fuel sprayed from the fuel injector 5 hits the fourth fuel guide section 311 or the sixth fuel guide section 313, it flows along the fourth fuel guide section 311 or the sixth fuel guide section 313 toward the inner wall of the second concave pit 31 close to the fuel injector 5 and the fifth fuel guide section 312 respectively.

[0044] In this embodiment, after the fuel sprayed by the fuel injector 5 hits the fourth fuel guide section 311 or the sixth fuel guide section 313, it flows along the fourth fuel guide section 311 or the sixth fuel guide section 313 toward the inner wall of one side of the second pit 31 close to the fuel injector 5 and the fifth fuel guide section 312, respectively. Figure 5 The middle arrows C, D, E and F show the flow direction of the fuel inside the second recess 31, so that most of the fuel is filled on the side of the second recess 31 facing the injector 5, and a small part is filled on the side of the first recess 21 close to the injector 5.

[0045] In some exemplary embodiments, referring to Figure 5 The fourth oil guiding section 311, the fifth oil guiding section 312 and the sixth oil guiding section 313 are all configured to be approximately arc-shaped.

[0046] Through the above arrangement, the fuel is guided to flow along the fourth oil guiding section 311 , the fifth oil guiding section 312 and the sixth oil guiding section 313 respectively, so that the fuel flows smoothly through the fourth oil guiding section 311 , the fifth oil guiding section 312 and the sixth oil guiding section 313 .

[0047] In some exemplary embodiments, referring to Figure 5 The projection of the middle part of the arc of the fifth oil guiding section 312 in the axial direction falls on the radial connecting line of the cross section of the second piston 3 , and the fourth guiding section 311 and the sixth guiding section 313 are symmetrically arranged with respect to the fifth guiding section 312 .

[0048] In this embodiment, the fifth oil guide section 312 is configured such that the projection of the middle of the arc of the fifth oil guide section 312 in the axial direction falls on the radial connecting line of the cross section of the second piston 3, and the fourth guide section 311 and the sixth guide section 313 are symmetrically arranged about the fifth guide section 312, so as to guide the oil beam 52 located on the outside sprayed by the injector 5 to flow toward the inner wall of one side of the second recess 31 close to the injector 5, as shown in FIG. Figure 5 As shown by arrows C and E, the oil flows toward the fifth oil guide section 312. Figure 5 As shown by arrows D and F in the middle.

[0049] In other words, when the first piston 2 and the second piston 3 are in contact with each other, the middle parts of the arcs of the injector 5 and the fifth oil guide section 312 face each other, so that after the oil beam 52 located on the outside sprayed by the injector 5 hits the fifth oil guide section 312, the oil beam 52 located on the outside sprayed by the injector 5 flows toward the inner wall of one side of the second pit 31 close to the injector 5 and the fifth oil guide section 312 respectively.

[0050] In some exemplary embodiments, referring to Figure 5The inner wall of the second recess 31 close to the injector 5 is configured to be roughly arc-shaped, and the two ends are smoothly connected to the fourth oil guide section 311 and the sixth oil guide section 313 respectively.

[0051] Through the above arrangement, the fuel can flow smoothly between the fourth oil guide section 311 and the side of the second pit 31 close to the injector 5 , or between the sixth oil guide section 313 and the side of the second pit 31 close to the injector 5 .

[0052] In some exemplary embodiments, referring to Figure 4-Figure 5 The first pit 21 and the second pit 31 are respectively formed with mutually matching notches 214, which are suitable for guiding the fuel sprayed by the injector 5 to be sprayed into the first pit 21 and the second pit 31 when the first piston 2 and the second piston 3 are in contact.

[0053] In this embodiment, mutually matching notches 214 are respectively formed on the first pit 21 and the second pit 31, so that when the first piston 2 and the second piston 3 are in contact, a flow channel is reserved for the fuel sprayed by the injector 5 to be sprayed into the combustion chamber 4, so as to guide the fuel sprayed by the injector 5 to be sprayed into the first pit 21 and the second pit 31.

[0054] The engine combustion system of the embodiment of the present invention has the following advantages:

[0055] The first recess 21 formed on the first piston 2 cooperates with the second recess 31 formed on the second piston 3 to form a combustion chamber 4 with the cylinder body 1. The cooperation between the first recess 21 and the second recess 31 guides the flow of fuel, enhances the airflow movement of the fuel near the wall of the combustion chamber 4, changes the diffusion direction of the fuel inside the combustion chamber 4, improves the air utilization rate in the combustion chamber 4, and makes the distribution of the combustible mixture inside the combustion chamber 4 tend to be uniform, thereby improving the oil-gas mixing characteristics.

[0056] The fuel sprayed by the injector 5 is sprayed into the first concave 21, and the middle oil beam 51 hits the second oil guide section 212. Under the diversion effect of the first oil guide section 211 and the third oil guide section 213, it is mixed with air in the entire first concave 21; the fuel sprayed by the injector 5 is sprayed into the second concave 31, and the outer oil beam 52 is mixed with air in the second concave 31 under the diversion effect of the fourth guide section 311 and the sixth guide section 313 through the guidance of the fifth guide section 312, thereby improving the air utilization rate in the combustion chamber 4. Under the premise of keeping the compression ratio unchanged, the engine combustion system of the present invention expands the mixing area of ​​fuel and air, and guides the spatial distribution of the combustible mixture in the cylinder 1 to be uniform.

[0057] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An engine combustion system, comprising: Cylinder body (1); A first piston (2) is movably mounted inside the cylinder body (1), and a first recess (21) is formed at one end of the first piston (2) extending in the axial direction; a second piston (3) movably mounted inside the cylinder body (1) and arranged facing the first piston (2); a second recess (31) is formed at one end of the second piston (3) facing the first recess (21); the first recess (21), the second recess (31) and the cylinder body (1) form a combustion chamber (4); as well as A fuel injector (5) mounted on the cylinder body (1) and adapted to inject fuel toward the interior of the combustion chamber (4); The first recess (21) is configured to guide the fuel to flow toward the inner wall (41) of the combustion chamber (4) close to the fuel injector (5) when the first piston (2) and the second piston (3) are in contact with each other; the second recess (31) is configured to guide the fuel to flow toward the inner wall of the combustion chamber (4) close to the fuel injector (5) and toward the inner wall of the combustion chamber (4) facing the fuel injector (5) when the first piston (2) and the second piston (3) are in contact with each other, so that the fuel is evenly dispersed inside the combustion chamber (4).

2. The engine combustion system according to claim 1, wherein: The inner wall of the first pit (21) facing the fuel injector (5) comprises a first fuel guide section (211), a second fuel guide section (212) and a third fuel guide section (213) which are smoothly connected in sequence, the first fuel guide section (211) and the third fuel guide section (213) being both recessed toward the side away from the fuel injector (5), and the second fuel guide section (212) being protruding toward the side facing the fuel injector (5), so that after the fuel sprayed by the fuel injector (5) hits the second fuel guide section (212), it flows along the first fuel guide section (211) and the third fuel guide section (213) toward the inner wall of the first pit (21) close to the fuel injector (5).

3. The engine combustion system according to claim 2, wherein: The first oil guiding section (211), the second oil guiding section (212) and the third oil guiding section (213) are all configured to be approximately arc-shaped.

4. The engine combustion system according to claim 3, wherein: The projection of the middle part of the circular arc of the second oil guiding section (212) in the axial direction falls on the radial connecting line of the cross section of the first piston (2), and the first oil guiding section (211) and the third oil guiding section (213) are symmetrically arranged with respect to the second oil guiding section (212).

5. The engine combustion system according to claim 3, wherein: The inner wall of the first recess (21) on the side close to the fuel injector (5) is configured to be substantially arc-shaped, and the two ends are respectively smoothly connected to the first oil guide section (211) and the third oil guide section (213).

6. The engine combustion system according to claim 1, wherein: The inner wall of the second recess (31) facing the fuel injector (5) comprises a fourth fuel guide section (311), a fifth fuel guide section (312) and a sixth fuel guide section (313) which are smoothly connected in sequence, the fourth fuel guide section (311) and the sixth fuel guide section (313) both protrude toward the side facing the fuel injector (5), and the fifth fuel guide section (312) is recessed toward the side away from the fuel injector (5), so that after the fuel sprayed from the fuel injector (5) hits the fourth fuel guide section (311) or the sixth fuel guide section (313), it flows along the fourth fuel guide section (311) or the sixth fuel guide section (313) toward the inner wall of the second recess (31) close to the fuel injector (5) and the fifth fuel guide section (312) respectively.

7. The engine combustion system according to claim 6, wherein: The fourth oil guiding section (311), the fifth oil guiding section (312) and the sixth oil guiding section (313) are all configured to be approximately arc-shaped.

8. The engine combustion system according to claim 7, wherein: The projection of the middle part of the arc of the fifth oil guide section (312) in the axial direction falls on the radial connecting line of the cross section of the second piston (3), and the fourth guide section (311) and the sixth guide section (313) are symmetrically arranged with respect to the fifth guide section (312).

9. The engine combustion system according to claim 7, wherein: The inner wall of the second recess (31) on the side close to the fuel injector (5) is configured to be substantially arc-shaped, and the two ends are respectively smoothly connected to the fourth oil guide section (311) and the sixth oil guide section (313).

10. The engine combustion system according to claim 1, wherein: The first recess (21) and the second recess (31) are respectively formed with mutually matching notches (214) which are suitable for guiding the fuel sprayed by the injector (5) to be sprayed into the first recess (21) and the second recess (31) when the first piston (2) and the second piston (3) are in contact with each other.

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